hpib.c revision 1.29
1 /* $NetBSD: hpib.c,v 1.29 2005/07/04 15:18:17 drochner 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 1.29 2005/07/04 15:18:17 drochner 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 #include "ioconf.h" 91 92 static int hpibbusmatch(struct device *, struct cfdata *, void *); 93 static void hpibbusattach(struct device *, struct device *, void *); 94 95 CFATTACH_DECL(hpibbus, sizeof(struct hpibbus_softc), 96 hpibbusmatch, hpibbusattach, NULL, NULL); 97 98 static void hpibbus_attach_children(struct hpibbus_softc *); 99 static int hpibbussearch(struct device *, struct cfdata *, 100 const locdesc_t *, void *); 101 static int hpibbusprint(void *, const char *); 102 103 static int hpibbus_alloc(struct hpibbus_softc *, int, int); 104 #if 0 105 static void hpibbus_free(struct hpibbus_softc *, int, int); 106 #endif 107 108 static void hpibstart(void *); 109 static void hpibdone(void *); 110 111 int hpibtimeout = 100000; /* # of status tests before we give up */ 112 int hpibidtimeout = 10000; /* # of status tests for hpibid() calls */ 113 int hpibdmathresh = 3; /* byte count beyond which to attempt dma */ 114 115 /* 116 * HP-IB is essentially an IEEE 488 bus, with an HP command 117 * set (CS/80 on `newer' devices, Amigo on before-you-were-born 118 * devices) thrown on top. Devices that respond to CS/80 (and 119 * probably Amigo, too) are tagged with a 16-bit ID. 120 * 121 * HP-IB has a 2-level addressing scheme; slave, the analog 122 * of a SCSI ID, and punit, the analog of a SCSI LUN. Unforunately, 123 * IDs are on a per-slave basis; punits are often used for disk 124 * drives that have an accompanying tape drive on the second punit. 125 * 126 * In addition, not all HP-IB devices speak CS/80 or Amigo. 127 * Examples of such devices are HP-IB plotters, which simply 128 * take raw plotter commands over 488. These devices do not 129 * have ID tags, and often the host cannot even tell if such 130 * a device is attached to the system! 131 * 132 * These two nasty bits mean that we have to treat HP-IB as 133 * an indirect bus. However, since we are given some ID 134 * information, it is unreasonable to disallow cloning of 135 * CS/80 devices. 136 * 137 * To deal with all of this, we use the semi-twisted scheme 138 * in hpibbus_attach_children(). For each HP-IB slave, we loop 139 * through all of the possibly-configured children, allowing 140 * them to modify the punit parameter (but NOT the slave!). 141 * 142 * This is evil, but what can you do? 143 */ 144 145 static int 146 hpibbusmatch(struct device *parent, struct cfdata *match, void *aux) 147 { 148 149 return (1); 150 } 151 152 static void 153 hpibbusattach(struct device *parent, struct device *self, void *aux) 154 { 155 struct hpibbus_softc *sc = (struct hpibbus_softc *)self; 156 struct hpibdev_attach_args *ha = aux; 157 158 printf("\n"); 159 160 /* Get the operations vector for the controller. */ 161 sc->sc_ops = ha->ha_ops; 162 sc->sc_type = ha->ha_type; /* XXX */ 163 sc->sc_ba = ha->ha_ba; 164 *(ha->ha_softcpp) = sc; /* XXX */ 165 166 hpibreset(self->dv_unit); /* XXX souldn't be here */ 167 168 /* 169 * Initialize the DMA queue entry. 170 */ 171 MALLOC(sc->sc_dq, struct dmaqueue *, sizeof(struct dmaqueue), 172 M_DEVBUF, M_NOWAIT); 173 if (sc->sc_dq == NULL) { 174 printf("%s: can't allocate DMA queue entry\n", self->dv_xname); 175 return; 176 } 177 sc->sc_dq->dq_softc = sc; 178 sc->sc_dq->dq_start = hpibstart; 179 sc->sc_dq->dq_done = hpibdone; 180 181 /* Initialize the slave request queue. */ 182 TAILQ_INIT(&sc->sc_queue); 183 184 /* Attach any devices on the bus. */ 185 hpibbus_attach_children(sc); 186 } 187 188 static void 189 hpibbus_attach_children(struct hpibbus_softc *sc) 190 { 191 struct hpibbus_attach_args ha; 192 int slave; 193 194 for (slave = 0; slave < 8; slave++) { 195 /* 196 * Get the ID tag for the device, if any. 197 * Plotters won't identify themselves, and 198 * get the same value as non-existent devices. 199 */ 200 ha.ha_id = hpibid(sc->sc_dev.dv_unit, slave); 201 202 ha.ha_slave = slave; /* not to be modified by children */ 203 ha.ha_punit = 0; /* children modify this */ 204 205 /* 206 * Search though all configured children for this bus. 207 */ 208 config_search_ia(hpibbussearch, &sc->sc_dev, "hpibbus", &ha); 209 } 210 } 211 212 static int 213 hpibbussearch(struct device *parent, struct cfdata *cf, 214 const locdesc_t *ldesc, void *aux) 215 { 216 struct hpibbus_softc *sc = (struct hpibbus_softc *)parent; 217 struct hpibbus_attach_args *ha = aux; 218 219 /* Make sure this is in a consistent state. */ 220 ha->ha_punit = 0; 221 222 if (config_match(parent, cf, ha) > 0) { 223 /* 224 * The device probe has succeeded, and filled in 225 * the punit information. Make sure the configuration 226 * allows for this slave/punit combination. 227 */ 228 if (cf->hpibbuscf_slave != HPIBBUSCF_SLAVE_DEFAULT && 229 cf->hpibbuscf_slave != ha->ha_slave) 230 goto out; 231 if (cf->hpibbuscf_punit != HPIBBUSCF_PUNIT_DEFAULT && 232 cf->hpibbuscf_punit != ha->ha_punit) 233 goto out; 234 235 /* 236 * Allocate the device's address from the bus's 237 * resource map. 238 */ 239 if (hpibbus_alloc(sc, ha->ha_slave, ha->ha_punit)) 240 goto out; 241 242 /* 243 * This device is allowed; attach it. 244 */ 245 config_attach(parent, cf, ha, hpibbusprint); 246 } 247 out: 248 return (0); 249 } 250 251 static int 252 hpibbusprint(void *aux, const char *pnp) 253 { 254 struct hpibbus_attach_args *ha = aux; 255 256 aprint_normal(" slave %d punit %d", ha->ha_slave, ha->ha_punit); 257 return (UNCONF); 258 } 259 260 int 261 hpibdevprint(void *aux, const char *pnp) 262 { 263 264 /* only hpibbus's can attach to hpibdev's -- easy. */ 265 if (pnp != NULL) 266 aprint_normal("hpibbus at %s", pnp); 267 return (UNCONF); 268 } 269 270 void 271 hpibreset(int unit) 272 { 273 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 274 275 (*sc->sc_ops->hpib_reset)(sc); 276 } 277 278 int 279 hpibreq(struct device *pdev, struct hpibqueue *hq) 280 { 281 struct hpibbus_softc *sc = (struct hpibbus_softc *)pdev; 282 int s; 283 284 s = splhigh(); /* XXXthorpej */ 285 TAILQ_INSERT_TAIL(&sc->sc_queue, hq, hq_list); 286 splx(s); 287 288 if (sc->sc_queue.tqh_first == hq) 289 return (1); 290 291 return (0); 292 } 293 294 void 295 hpibfree(struct device *pdev, struct hpibqueue *hq) 296 { 297 struct hpibbus_softc *sc = (struct hpibbus_softc *)pdev; 298 int s; 299 300 s = splhigh(); /* XXXthorpej */ 301 TAILQ_REMOVE(&sc->sc_queue, hq, hq_list); 302 splx(s); 303 304 if ((hq = sc->sc_queue.tqh_first) != NULL) 305 (*hq->hq_start)(hq->hq_softc); 306 } 307 308 int 309 hpibid(int unit, int slave) 310 { 311 short id; 312 int ohpibtimeout; 313 314 /* 315 * XXX shorten timeout value so autoconfig doesn't 316 * take forever on slow CPUs. 317 */ 318 ohpibtimeout = hpibtimeout; 319 hpibtimeout = hpibidtimeout * (cpuspeed / 8); 320 if (hpibrecv(unit, 31, slave, &id, 2) != 2) 321 id = 0; 322 hpibtimeout = ohpibtimeout; 323 return(id); 324 } 325 326 int 327 hpibsend(int unit, int slave, int sec, void *addr, int cnt) 328 { 329 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 330 331 return ((*sc->sc_ops->hpib_send)(sc, slave, sec, addr, cnt)); 332 } 333 334 int 335 hpibrecv(int unit, int slave, int sec, void *addr, int cnt) 336 { 337 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 338 339 return ((*sc->sc_ops->hpib_recv)(sc, slave, sec, addr, cnt)); 340 } 341 342 int 343 hpibpptest(int unit, int slave) 344 { 345 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 346 347 return ((*sc->sc_ops->hpib_ppoll)(sc) & (0x80 >> slave)); 348 } 349 350 void 351 hpibppclear(int unit) 352 { 353 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 354 355 sc->sc_flags &= ~HPIBF_PPOLL; 356 } 357 358 void 359 hpibawait(int unit) 360 { 361 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 362 363 sc->sc_flags |= HPIBF_PPOLL; 364 (*sc->sc_ops->hpib_ppwatch)(sc); 365 } 366 367 int 368 hpibswait(int unit, int slave) 369 { 370 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 371 int timo = hpibtimeout; 372 int mask, (*ppoll)(struct hpibbus_softc *); 373 374 ppoll = sc->sc_ops->hpib_ppoll; 375 mask = 0x80 >> slave; 376 while (((*ppoll)(sc) & mask) == 0) { 377 if (--timo == 0) { 378 printf("%s: swait timeout\n", sc->sc_dev.dv_xname); 379 return(-1); 380 } 381 } 382 return(0); 383 } 384 385 int 386 hpibustart(int unit) 387 { 388 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 389 390 if (sc->sc_type == HPIBA) 391 sc->sc_dq->dq_chan = DMA0; 392 else 393 sc->sc_dq->dq_chan = DMA0 | DMA1; 394 if (dmareq(sc->sc_dq)) 395 return(1); 396 return(0); 397 } 398 399 static void 400 hpibstart(void *arg) 401 { 402 struct hpibbus_softc *sc = arg; 403 struct hpibqueue *hq; 404 405 hq = sc->sc_queue.tqh_first; 406 (*hq->hq_go)(hq->hq_softc); 407 } 408 409 void 410 hpibgo(int unit, int slave, int sec, void *vbuf, int count, int rw, int timo) 411 { 412 struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit]; 413 414 (*sc->sc_ops->hpib_go)(sc, slave, sec, vbuf, count, rw, timo); 415 } 416 417 static void 418 hpibdone(void *arg) 419 { 420 struct hpibbus_softc *sc = arg; 421 422 (*sc->sc_ops->hpib_done)(sc); 423 } 424 425 int 426 hpibintr(void *arg) 427 { 428 struct hpibbus_softc *sc = arg; 429 430 return ((sc->sc_ops->hpib_intr)(arg)); 431 } 432 433 static int 434 hpibbus_alloc(struct hpibbus_softc *sc, int slave, int punit) 435 { 436 437 if (slave >= HPIB_NSLAVES || 438 punit >= HPIB_NPUNITS) 439 panic("hpibbus_alloc: device address out of range"); 440 441 if (sc->sc_rmap[slave][punit] == 0) { 442 sc->sc_rmap[slave][punit] = 1; 443 return (0); 444 } 445 return (1); 446 } 447 448 #if 0 449 static void 450 hpibbus_free(struct hpibbus_softc *sc, int slave, int punit) 451 { 452 453 if (slave >= HPIB_NSLAVES || 454 punit >= HPIB_NPUNITS) 455 panic("hpibbus_free: device address out of range"); 456 457 #ifdef DIAGNOSTIC 458 if (sc->sc_rmap[slave][punit] == 0) 459 panic("hpibbus_free: not allocated"); 460 #endif 461 462 sc->sc_rmap[slave][punit] = 0; 463 } 464 #endif 465
Indexes created Tue Sep 23 14:10:03 GMT 2025