hpib.c revision 1.38
1 /* $NetBSD: hpib.c,v 1.38 2008/06/13 09:41:15 cegger 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)hpib.c 8.2 (Berkeley) 1/12/94 61 */ 62 63 /* 64 * HP-IB bus driver 65 */ 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: hpib.c,v 1.38 2008/06/13 09:41:15 cegger Exp $"); 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/buf.h> 73 #include <sys/malloc.h> 74 #include <sys/device.h> 75 76 #include <hp300/dev/dmavar.h> 77 78 #include <hp300/dev/hpibvar.h> 79 80 #include <machine/cpu.h> 81 #include <machine/hp300spu.h> 82 83 #include "ioconf.h" 84 85 static int hpibbusmatch(device_t, cfdata_t, void *); 86 static void hpibbusattach(device_t, device_t, void *); 87 88 CFATTACH_DECL_NEW(hpibbus, sizeof(struct hpibbus_softc), 89 hpibbusmatch, hpibbusattach, NULL, NULL); 90 91 static void hpibbus_attach_children(struct hpibbus_softc *); 92 static int hpibbussearch(device_t, cfdata_t, const int *, void *); 93 static int hpibbusprint(void *, const char *); 94 95 static int hpibbus_alloc(struct hpibbus_softc *, int, int); 96 #if 0 97 static void hpibbus_free(struct hpibbus_softc *, int, int); 98 #endif 99 100 static void hpibstart(void *); 101 static void hpibdone(void *); 102 103 int hpibtimeout = 100000; /* # of status tests before we give up */ 104 int hpibidtimeout = 10000; /* # of status tests for hpibid() calls */ 105 int hpibdmathresh = 3; /* byte count beyond which to attempt dma */ 106 107 /* 108 * HP-IB is essentially an IEEE 488 bus, with an HP command 109 * set (CS/80 on `newer' devices, Amigo on before-you-were-born 110 * devices) thrown on top. Devices that respond to CS/80 (and 111 * probably Amigo, too) are tagged with a 16-bit ID. 112 * 113 * HP-IB has a 2-level addressing scheme; slave, the analog 114 * of a SCSI ID, and punit, the analog of a SCSI LUN. Unforunately, 115 * IDs are on a per-slave basis; punits are often used for disk 116 * drives that have an accompanying tape drive on the second punit. 117 * 118 * In addition, not all HP-IB devices speak CS/80 or Amigo. 119 * Examples of such devices are HP-IB plotters, which simply 120 * take raw plotter commands over 488. These devices do not 121 * have ID tags, and often the host cannot even tell if such 122 * a device is attached to the system! 123 * 124 * These two nasty bits mean that we have to treat HP-IB as 125 * an indirect bus. However, since we are given some ID 126 * information, it is unreasonable to disallow cloning of 127 * CS/80 devices. 128 * 129 * To deal with all of this, we use the semi-twisted scheme 130 * in hpibbus_attach_children(). For each HP-IB slave, we loop 131 * through all of the possibly-configured children, allowing 132 * them to modify the punit parameter (but NOT the slave!). 133 * 134 * This is evil, but what can you do? 135 */ 136 137 static int 138 hpibbusmatch(device_t parent, cfdata_t cf, void *aux) 139 { 140 141 return 1; 142 } 143 144 static void 145 hpibbusattach(device_t parent, device_t self, void *aux) 146 { 147 struct hpibbus_softc *sc = device_private(self); 148 struct hpibdev_attach_args *ha = aux; 149 150 sc->sc_dev = self; 151 aprint_normal("\n"); 152 153 /* Get the operations vector for the controller. */ 154 sc->sc_ops = ha->ha_ops; 155 sc->sc_type = ha->ha_type; /* XXX */ 156 sc->sc_ba = ha->ha_ba; 157 *(ha->ha_softcpp) = sc; /* XXX */ 158 159 hpibreset(device_unit(self)); /* XXX souldn't be here */ 160 161 /* 162 * Initialize the DMA queue entry. 163 */ 164 sc->sc_dq = malloc(sizeof(struct dmaqueue), M_DEVBUF, M_NOWAIT); 165 if (sc->sc_dq == NULL) { 166 aprint_error_dev(self, "can't allocate DMA queue entry\n"); 167 return; 168 } 169 sc->sc_dq->dq_softc = sc; 170 sc->sc_dq->dq_start = hpibstart; 171 sc->sc_dq->dq_done = hpibdone; 172 173 /* Initialize the slave request queue. */ 174 TAILQ_INIT(&sc->sc_queue); 175 176 /* Attach any devices on the bus. */ 177 hpibbus_attach_children(sc); 178 } 179 180 static void 181 hpibbus_attach_children(struct hpibbus_softc *sc) 182 { 183 struct hpibbus_attach_args ha; 184 int slave; 185 186 for (slave = 0; slave < 8; slave++) { 187 /* 188 * Get the ID tag for the device, if any. 189 * Plotters won't identify themselves, and 190 * get the same value as non-existent devices. 191 */ 192 ha.ha_id = hpibid(device_unit(sc->sc_dev), slave); 193 194 ha.ha_slave = slave; /* not to be modified by children */ 195 ha.ha_punit = 0; /* children modify this */ 196 197 /* 198 * Search though all configured children for this bus. 199 */ 200 config_search_ia(hpibbussearch, sc->sc_dev, "hpibbus", &ha); 201 } 202 } 203 204 static int 205 hpibbussearch(device_t parent, cfdata_t cf, const int *ldesc, void *aux) 206 { 207 struct hpibbus_softc *sc = device_private(parent); 208 struct hpibbus_attach_args *ha = aux; 209 210 /* Make sure this is in a consistent state. */ 211 ha->ha_punit = 0; 212 213 if (config_match(parent, cf, ha) > 0) { 214 /* 215 * The device probe has succeeded, and filled in 216 * the punit information. Make sure the configuration 217 * allows for this slave/punit combination. 218 */ 219 if (cf->hpibbuscf_slave != HPIBBUSCF_SLAVE_DEFAULT && 220 cf->hpibbuscf_slave != ha->ha_slave) 221 goto out; 222 if (cf->hpibbuscf_punit != HPIBBUSCF_PUNIT_DEFAULT && 223 cf->hpibbuscf_punit != ha->ha_punit) 224 goto out; 225 226 /* 227 * Allocate the device's address from the bus's 228 * resource map. 229 */ 230 if (hpibbus_alloc(sc, ha->ha_slave, ha->ha_punit)) 231 goto out; 232 233 /* 234 * This device is allowed; attach it. 235 */ 236 config_attach(parent, cf, ha, hpibbusprint); 237 } 238 out: 239 return 0; 240 } 241 242 static int 243 hpibbusprint(void *aux, const char *pnp) 244 { 245 struct hpibbus_attach_args *ha = aux; 246 247 aprint_normal(" slave %d punit %d", ha->ha_slave, ha->ha_punit); 248 return UNCONF; 249 } 250 251 int 252 hpibdevprint(void *aux, const char *pnp) 253 { 254 255 /* only hpibbus's can attach to hpibdev's -- easy. */ 256 if (pnp != NULL) 257 aprint_normal("hpibbus at %s", pnp); 258 return UNCONF; 259 } 260 261 void 262 hpibreset(int unit) 263 { 264 struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); 265 266 (*sc->sc_ops->hpib_reset)(sc); 267 } 268 269 int 270 hpibreq(struct device *pdev, struct hpibqueue *hq) 271 { 272 struct hpibbus_softc *sc = device_private(pdev); 273 int s; 274 275 s = splhigh(); /* XXXthorpej */ 276 TAILQ_INSERT_TAIL(&sc->sc_queue, hq, hq_list); 277 splx(s); 278 279 if (TAILQ_FIRST(&sc->sc_queue) == hq) 280 return 1; 281 282 return 0; 283 } 284 285 void 286 hpibfree(struct device *pdev, struct hpibqueue *hq) 287 { 288 struct hpibbus_softc *sc = device_private(pdev); 289 int s; 290 291 s = splhigh(); /* XXXthorpej */ 292 TAILQ_REMOVE(&sc->sc_queue, hq, hq_list); 293 splx(s); 294 295 if ((hq = TAILQ_FIRST(&sc->sc_queue)) != NULL) 296 (*hq->hq_start)(hq->hq_softc); 297 } 298 299 int 300 hpibid(int unit, int slave) 301 { 302 short id; 303 int ohpibtimeout; 304 305 /* 306 * XXX shorten timeout value so autoconfig doesn't 307 * take forever on slow CPUs. 308 */ 309 ohpibtimeout = hpibtimeout; 310 hpibtimeout = hpibidtimeout * (cpuspeed / 8); 311 if (hpibrecv(unit, 31, slave, &id, 2) != 2) 312 id = 0; 313 hpibtimeout = ohpibtimeout; 314 return id; 315 } 316 317 int 318 hpibsend(int unit, int slave, int sec, void *addr, int cnt) 319 { 320 struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); 321 322 return (*sc->sc_ops->hpib_send)(sc, slave, sec, addr, cnt); 323 } 324 325 int 326 hpibrecv(int unit, int slave, int sec, void *addr, int cnt) 327 { 328 struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); 329 330 return (*sc->sc_ops->hpib_recv)(sc, slave, sec, addr, cnt); 331 } 332 333 int 334 hpibpptest(int unit, int slave) 335 { 336 struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); 337 338 return (*sc->sc_ops->hpib_ppoll)(sc) & (0x80 >> slave); 339 } 340 341 void 342 hpibppclear(int unit) 343 { 344 struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); 345 346 sc->sc_flags &= ~HPIBF_PPOLL; 347 } 348 349 void 350 hpibawait(int unit) 351 { 352 struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd, unit); 353 354 sc->sc_flags |= HPIBF_PPOLL; 355 (*sc->sc_ops->hpib_ppwatch)(sc); 356 } 357 358 int 359 hpibswait(int unit, int slave) 360 { 361 struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd, unit); 362 int timo = hpibtimeout; 363 int mask, (*ppoll)(struct hpibbus_softc *); 364 365 ppoll = sc->sc_ops->hpib_ppoll; 366 mask = 0x80 >> slave; 367 while (((*ppoll)(sc) & mask) == 0) { 368 if (--timo == 0) { 369 printf("%s: swait timeout\n", device_xname(sc->sc_dev)); 370 return -1; 371 } 372 } 373 return 0; 374 } 375 376 int 377 hpibustart(int unit) 378 { 379 struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); 380 381 if (sc->sc_type == HPIBA) 382 sc->sc_dq->dq_chan = DMA0; 383 else 384 sc->sc_dq->dq_chan = DMA0 | DMA1; 385 if (dmareq(sc->sc_dq)) 386 return 1; 387 return 0; 388 } 389 390 static void 391 hpibstart(void *arg) 392 { 393 struct hpibbus_softc *sc = arg; 394 struct hpibqueue *hq; 395 396 hq = TAILQ_FIRST(&sc->sc_queue); 397 (*hq->hq_go)(hq->hq_softc); 398 } 399 400 void 401 hpibgo(int unit, int slave, int sec, void *vbuf, int count, int rw, int timo) 402 { 403 struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); 404 405 (*sc->sc_ops->hpib_go)(sc, slave, sec, vbuf, count, rw, timo); 406 } 407 408 static void 409 hpibdone(void *arg) 410 { 411 struct hpibbus_softc *sc = arg; 412 413 (*sc->sc_ops->hpib_done)(sc); 414 } 415 416 int 417 hpibintr(void *arg) 418 { 419 struct hpibbus_softc *sc = arg; 420 421 return (sc->sc_ops->hpib_intr)(arg); 422 } 423 424 static int 425 hpibbus_alloc(struct hpibbus_softc *sc, int slave, int punit) 426 { 427 428 if (slave >= HPIB_NSLAVES || 429 punit >= HPIB_NPUNITS) 430 panic("hpibbus_alloc: device address out of range"); 431 432 if (sc->sc_rmap[slave][punit] == 0) { 433 sc->sc_rmap[slave][punit] = 1; 434 return 0; 435 } 436 return 1; 437 } 438 439 #if 0 440 static void 441 hpibbus_free(struct hpibbus_softc *sc, int slave, int punit) 442 { 443 444 if (slave >= HPIB_NSLAVES || 445 punit >= HPIB_NPUNITS) 446 panic("hpibbus_free: device address out of range"); 447 448 #ifdef DIAGNOSTIC 449 if (sc->sc_rmap[slave][punit] == 0) 450 panic("hpibbus_free: not allocated"); 451 #endif 452 453 sc->sc_rmap[slave][punit] = 0; 454 } 455 #endif 456
Indexes created Thu Sep 25 16:09:42 GMT 2025