hpib.c revision 1.27
1 /* $NetBSD: hpib.c,v 1.27 2004/08/28 17:37:01 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1982, 1990, 1993 41 * The Regents of the University of California. All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)hpib.c 8.2 (Berkeley) 1/12/94 68 */ 69 70 /* 71 * HP-IB bus driver 72 */ 73 74 #include <sys/cdefs.h> 75 __KERNEL_RCSID(0, "$NetBSD: hpib.c,v 1.27 2004/08/28 17:37:01 thorpej Exp $"); 76 77 #include <sys/param.h> 78 #include <sys/systm.h> 79 #include <sys/buf.h> 80 #include <sys/malloc.h> 81 #include <sys/device.h> 82 83 #include <hp300/dev/dmavar.h> 84 85 #include <hp300/dev/hpibvar.h> 86 87 #include <machine/cpu.h> 88 #include <machine/hp300spu.h> 89 90 static int hpibbusmatch(struct device *, struct cfdata *, void *); 91 static void hpibbusattach(struct device *, struct device *, void *); 92 93 CFATTACH_DECL(hpibbus, sizeof(struct hpibbus_softc), 94 hpibbusmatch, hpibbusattach, NULL, NULL); 95 96 extern struct cfdriver hpibbus_cd; 97 98 static void hpibbus_attach_children(struct hpibbus_softc *); 99 static int hpibbussearch(struct device *, struct cfdata *, void *); 100 static int hpibbusprint(void *, const char *); 101 102 static int hpibbus_alloc(struct hpibbus_softc *, int, int); 103 #if 0 104 static void hpibbus_free(struct hpibbus_softc *, int, int); 105 #endif 106 107 static void hpibstart(void *); 108 static void hpibdone(void *); 109 110 int hpibtimeout = 100000; /* # of status tests before we give up */ 111 int hpibidtimeout = 10000; /* # of status tests for hpibid() calls */ 112 int hpibdmathresh = 3; /* byte count beyond which to attempt dma */ 113 114 /* 115 * HP-IB is essentially an IEEE 488 bus, with an HP command 116 * set (CS/80 on `newer' devices, Amigo on before-you-were-born 117 * devices) thrown on top. Devices that respond to CS/80 (and 118 * probably Amigo, too) are tagged with a 16-bit ID. 119 * 120 * HP-IB has a 2-level addressing scheme; slave, the analog 121 * of a SCSI ID, and punit, the analog of a SCSI LUN. Unforunately, 122 * IDs are on a per-slave basis; punits are often used for disk 123 * drives that have an accompanying tape drive on the second punit. 124 * 125 * In addition, not all HP-IB devices speak CS/80 or Amigo. 126 * Examples of such devices are HP-IB plotters, which simply 127 * take raw plotter commands over 488. These devices do not 128 * have ID tags, and often the host cannot even tell if such 129 * a device is attached to the system! 130 * 131 * These two nasty bits mean that we have to treat HP-IB as 132 * an indirect bus. However, since we are given some ID 133 * information, it is unreasonable to disallow cloning of 134 * CS/80 devices. 135 * 136 * To deal with all of this, we use the semi-twisted scheme 137 * in hpibbus_attach_children(). For each HP-IB slave, we loop 138 * through all of the possibly-configured children, allowing 139 * them to modify the punit parameter (but NOT the slave!). 140 * 141 * This is evil, but what can you do? 142 */ 143 144 static int 145 hpibbusmatch(struct device *parent, struct cfdata *match, void *aux) 146 { 147 148 return (1); 149 } 150 151 static void 152 hpibbusattach(struct device *parent, struct device *self, void *aux) 153 { 154 struct hpibbus_softc *sc = (struct hpibbus_softc *)self; 155 struct hpibdev_attach_args *ha = aux; 156 157 printf("\n"); 158 159 /* Get the operations vector for the controller. */ 160 sc->sc_ops = ha->ha_ops; 161 sc->sc_type = ha->ha_type; /* XXX */ 162 sc->sc_ba = ha->ha_ba; 163 *(ha->ha_softcpp) = sc; /* XXX */ 164 165 hpibreset(self->dv_unit); /* XXX souldn't be here */ 166 167 /* 168 * Initialize the DMA queue entry. 169 */ 170 MALLOC(sc->sc_dq, struct dmaqueue *, sizeof(struct dmaqueue), 171 M_DEVBUF, M_NOWAIT); 172 if (sc->sc_dq == NULL) { 173 printf("%s: can't allocate DMA queue entry\n", self->dv_xname); 174 return; 175 } 176 sc->sc_dq->dq_softc = sc; 177 sc->sc_dq->dq_start = hpibstart; 178 sc->sc_dq->dq_done = hpibdone; 179 180 /* Initialize the slave request queue. */ 181 TAILQ_INIT(&sc->sc_queue); 182 183 /* Attach any devices on the bus. */ 184 hpibbus_attach_children(sc); 185 } 186 187 static void 188 hpibbus_attach_children(struct hpibbus_softc *sc) 189 { 190 struct hpibbus_attach_args ha; 191 int slave; 192 193 for (slave = 0; slave < 8; slave++) { 194 /* 195 * Get the ID tag for the device, if any. 196 * Plotters won't identify themselves, and 197 * get the same value as non-existent devices. 198 */ 199 ha.ha_id = hpibid(sc->sc_dev.dv_unit, slave); 200 201 ha.ha_slave = slave; /* not to be modified by children */ 202 ha.ha_punit = 0; /* children modify this */ 203 204 /* 205 * Search though all configured children for this bus. 206 */ 207 (void)config_search(hpibbussearch, &sc->sc_dev, &ha); 208 } 209 } 210 211 static int 212 hpibbussearch(struct device *parent, struct cfdata *cf, void *aux) 213 { 214 struct hpibbus_softc *sc = (struct hpibbus_softc *)parent; 215 struct hpibbus_attach_args *ha = aux; 216 217 /* Make sure this is in a consistent state. */ 218 ha->ha_punit = 0; 219 220 if (config_match(parent, cf, ha) > 0) { 221 /* 222 * The device probe has succeeded, and filled in 223 * the punit information. Make sure the configuration 224 * allows for this slave/punit combination. 225 */ 226 if (cf->hpibbuscf_slave != HPIBBUSCF_SLAVE_DEFAULT && 227 cf->hpibbuscf_slave != ha->ha_slave) 228 goto out; 229 if (cf->hpibbuscf_punit != HPIBBUSCF_PUNIT_DEFAULT && 230 cf->hpibbuscf_punit != ha->ha_punit) 231 goto out; 232 233 /* 234 * Allocate the device's address from the bus's 235 * resource map. 236 */ 237 if (hpibbus_alloc(sc, ha->ha_slave, ha->ha_punit)) 238 goto out; 239 240 /* 241 * This device is allowed; attach it. 242 */ 243 config_attach(parent, cf, ha, hpibbusprint); 244 } 245 out: 246 return (0); 247 } 248 249 static int 250 hpibbusprint(void *aux, const char *pnp) 251 { 252 struct hpibbus_attach_args *ha = aux; 253 254 aprint_normal(" slave %d punit %d", ha->ha_slave, ha->ha_punit); 255 return (UNCONF); 256 } 257 258 int 259 hpibdevprint(void *aux, const char *pnp) 260 { 261 262 /* only hpibbus's can attach to hpibdev's -- easy. */ 263 if (pnp != NULL) 264 aprint_normal("hpibbus at %s", pnp); 265 return (UNCONF); 266 } 267 268 void 269 hpibreset(int unit) 270 { 271 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 272 273 (*sc->sc_ops->hpib_reset)(sc); 274 } 275 276 int 277 hpibreq(struct device *pdev, struct hpibqueue *hq) 278 { 279 struct hpibbus_softc *sc = (struct hpibbus_softc *)pdev; 280 int s; 281 282 s = splhigh(); /* XXXthorpej */ 283 TAILQ_INSERT_TAIL(&sc->sc_queue, hq, hq_list); 284 splx(s); 285 286 if (sc->sc_queue.tqh_first == hq) 287 return (1); 288 289 return (0); 290 } 291 292 void 293 hpibfree(struct device *pdev, struct hpibqueue *hq) 294 { 295 struct hpibbus_softc *sc = (struct hpibbus_softc *)pdev; 296 int s; 297 298 s = splhigh(); /* XXXthorpej */ 299 TAILQ_REMOVE(&sc->sc_queue, hq, hq_list); 300 splx(s); 301 302 if ((hq = sc->sc_queue.tqh_first) != NULL) 303 (*hq->hq_start)(hq->hq_softc); 304 } 305 306 int 307 hpibid(int unit, int slave) 308 { 309 short id; 310 int ohpibtimeout; 311 312 /* 313 * XXX shorten timeout value so autoconfig doesn't 314 * take forever on slow CPUs. 315 */ 316 ohpibtimeout = hpibtimeout; 317 hpibtimeout = hpibidtimeout * (cpuspeed / 8); 318 if (hpibrecv(unit, 31, slave, &id, 2) != 2) 319 id = 0; 320 hpibtimeout = ohpibtimeout; 321 return(id); 322 } 323 324 int 325 hpibsend(int unit, int slave, int sec, void *addr, int cnt) 326 { 327 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 328 329 return ((*sc->sc_ops->hpib_send)(sc, slave, sec, addr, cnt)); 330 } 331 332 int 333 hpibrecv(int unit, int slave, int sec, void *addr, int cnt) 334 { 335 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 336 337 return ((*sc->sc_ops->hpib_recv)(sc, slave, sec, addr, cnt)); 338 } 339 340 int 341 hpibpptest(int unit, int slave) 342 { 343 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 344 345 return ((*sc->sc_ops->hpib_ppoll)(sc) & (0x80 >> slave)); 346 } 347 348 void 349 hpibppclear(int unit) 350 { 351 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 352 353 sc->sc_flags &= ~HPIBF_PPOLL; 354 } 355 356 void 357 hpibawait(int unit) 358 { 359 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 360 361 sc->sc_flags |= HPIBF_PPOLL; 362 (*sc->sc_ops->hpib_ppwatch)(sc); 363 } 364 365 int 366 hpibswait(int unit, int slave) 367 { 368 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 369 int timo = hpibtimeout; 370 int mask, (*ppoll)(struct hpibbus_softc *); 371 372 ppoll = sc->sc_ops->hpib_ppoll; 373 mask = 0x80 >> slave; 374 while (((*ppoll)(sc) & mask) == 0) { 375 if (--timo == 0) { 376 printf("%s: swait timeout\n", sc->sc_dev.dv_xname); 377 return(-1); 378 } 379 } 380 return(0); 381 } 382 383 int 384 hpibustart(int unit) 385 { 386 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 387 388 if (sc->sc_type == HPIBA) 389 sc->sc_dq->dq_chan = DMA0; 390 else 391 sc->sc_dq->dq_chan = DMA0 | DMA1; 392 if (dmareq(sc->sc_dq)) 393 return(1); 394 return(0); 395 } 396 397 static void 398 hpibstart(void *arg) 399 { 400 struct hpibbus_softc *sc = arg; 401 struct hpibqueue *hq; 402 403 hq = sc->sc_queue.tqh_first; 404 (*hq->hq_go)(hq->hq_softc); 405 } 406 407 void 408 hpibgo(int unit, int slave, int sec, void *vbuf, int count, int rw, int timo) 409 { 410 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 411 412 (*sc->sc_ops->hpib_go)(sc, slave, sec, vbuf, count, rw, timo); 413 } 414 415 static void 416 hpibdone(void *arg) 417 { 418 struct hpibbus_softc *sc = arg; 419 420 (*sc->sc_ops->hpib_done)(sc); 421 } 422 423 int 424 hpibintr(void *arg) 425 { 426 struct hpibbus_softc *sc = arg; 427 428 return ((sc->sc_ops->hpib_intr)(arg)); 429 } 430 431 static int 432 hpibbus_alloc(struct hpibbus_softc *sc, int slave, int punit) 433 { 434 435 if (slave >= HPIB_NSLAVES || 436 punit >= HPIB_NPUNITS) 437 panic("hpibbus_alloc: device address out of range"); 438 439 if (sc->sc_rmap[slave][punit] == 0) { 440 sc->sc_rmap[slave][punit] = 1; 441 return (0); 442 } 443 return (1); 444 } 445 446 #if 0 447 static void 448 hpibbus_free(struct hpibbus_softc *sc, int slave, int punit) 449 { 450 451 if (slave >= HPIB_NSLAVES || 452 punit >= HPIB_NPUNITS) 453 panic("hpibbus_free: device address out of range"); 454 455 #ifdef DIAGNOSTIC 456 if (sc->sc_rmap[slave][punit] == 0) 457 panic("hpibbus_free: not allocated"); 458 #endif 459 460 sc->sc_rmap[slave][punit] = 0; 461 } 462 #endif 463
Indexes created Wed Sep 24 14:09:57 GMT 2025