ahc_isa.c revision 1.22
1 /* $NetBSD: ahc_isa.c,v 1.22 2003/04/20 16:54:23 fvdl Exp $ */ 2 3 /* 4 * Product specific probe and attach routines for: 5 * AHA-284X VL-bus SCSI controllers 6 * 7 * Copyright (c) 1994, 1995, 1996, 1997, 1998 Justin T. Gibbs. 8 * All rights reserved. 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 immediately at the beginning of the file, without modification, 15 * this list of conditions, and the following disclaimer. 16 * 2. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD: src/sys/dev/aic7xxx/ahc_eisa.c,v 1.15 2000/01/29 14:22:19 peter Exp $ 32 */ 33 34 /*- 35 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. 36 * All rights reserved. 37 * 38 * This code is derived from software contributed to The NetBSD Foundation 39 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 40 * NASA Ames Research Center. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the NetBSD 53 * Foundation, Inc. and its contributors. 54 * 4. Neither the name of The NetBSD Foundation nor the names of its 55 * contributors may be used to endorse or promote products derived 56 * from this software without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 59 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 60 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 61 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 62 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 63 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 64 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 65 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 66 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 67 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 68 * POSSIBILITY OF SUCH DAMAGE. 69 */ 70 71 /* 72 * Copyright (c) 1995, 1996 Christopher G. Demetriou 73 * All rights reserved. 74 * 75 * Redistribution and use in source and binary forms, with or without 76 * modification, are permitted provided that the following conditions 77 * are met: 78 * 1. Redistributions of source code must retain the above copyright 79 * notice, this list of conditions and the following disclaimer. 80 * 2. Redistributions in binary form must reproduce the above copyright 81 * notice, this list of conditions and the following disclaimer in the 82 * documentation and/or other materials provided with the distribution. 83 * 3. All advertising materials mentioning features or use of this software 84 * must display the following acknowledgement: 85 * This product includes software developed by Christopher G. Demetriou 86 * for the NetBSD Project. 87 * 4. The name of the author may not be used to endorse or promote products 88 * derived from this software without specific prior written permission 89 * 90 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 91 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 92 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 93 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 94 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 95 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 96 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 97 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 98 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 99 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 100 */ 101 102 /* 103 * This front-end driver is really sort of a hack. The AHA-284X likes 104 * to masquerade as an EISA device. However, on VLbus machines with 105 * no EISA signature in the BIOS, the EISA bus will never be scanned. 106 * This is intended to catch the 284X controllers on those systems 107 * by looking in "EISA i/o space" for 284X controllers. 108 * 109 * This relies heavily on i/o port accounting. We also just use the 110 * EISA macros for everything ... it's a real waste to redefine them. 111 * 112 * Note: there isn't any #ifdef for FreeBSD in this file, since the 113 * FreeBSD EISA driver handles all cases of the 284X. 114 * 115 * -- Jason R. Thorpe <thorpej (at) NetBSD.ORG> 116 * July 12, 1996 117 */ 118 119 #include <sys/cdefs.h> 120 __KERNEL_RCSID(0, "$NetBSD: ahc_isa.c,v 1.22 2003/04/20 16:54:23 fvdl Exp $"); 121 122 #include <sys/param.h> 123 #include <sys/systm.h> 124 #include <sys/kernel.h> 125 #include <sys/device.h> 126 #include <sys/queue.h> 127 #include <sys/malloc.h> 128 #include <sys/reboot.h> 129 130 #include <machine/bus.h> 131 #include <machine/intr.h> 132 133 #include <dev/scsipi/scsi_all.h> 134 #include <dev/scsipi/scsipi_all.h> 135 #include <dev/scsipi/scsiconf.h> 136 137 #include <dev/isa/isavar.h> 138 139 #include <dev/eisa/eisareg.h> 140 #include <dev/eisa/eisavar.h> 141 #include <dev/eisa/eisadevs.h> 142 143 #include <dev/ic/aic7xxx_osm.h> 144 #include <dev/ic/aic7xxx_inline.h> 145 #include <dev/ic/aic77xxreg.h> 146 #include <dev/ic/aic77xxvar.h> 147 #include <dev/ic/smc93cx6var.h> 148 149 /* IO port address setting range as EISA slot number */ 150 #define AHC_ISA_MIN_SLOT 0x1 /* from iobase = 0x1c00 */ 151 #define AHC_ISA_MAX_SLOT 0xe /* to iobase = 0xec00 */ 152 153 #define AHC_ISA_SLOT_OFFSET AHC_EISA_SLOT_OFFSET 154 #define AHC_ISA_IOSIZE AHC_EISA_IOSIZE 155 156 /* 157 * I/O port offsets 158 */ 159 #define AHC_ISA_VID (EISA_SLOTOFF_VID - AHC_ISA_SLOT_OFFSET) 160 #define AHC_ISA_PID (EISA_SLOTOFF_PID - AHC_ISA_SLOT_OFFSET) 161 #define AHC_ISA_PRIMING AHC_ISA_VID /* enable vendor/product ID */ 162 163 /* 164 * AHC_ISA_PRIMING register values (write) 165 */ 166 #define AHC_ISA_PRIMING_VID(index) (AHC_ISA_VID + (index)) 167 #define AHC_ISA_PRIMING_PID(index) (AHC_ISA_PID + (index)) 168 169 int ahc_isa_idstring __P((bus_space_tag_t, bus_space_handle_t, char *)); 170 int ahc_isa_match __P((struct isa_attach_args *, bus_addr_t)); 171 172 int ahc_isa_probe __P((struct device *, struct cfdata *, void *)); 173 void ahc_isa_attach __P((struct device *, struct device *, void *)); 174 void aha2840_load_seeprom __P((struct ahc_softc *ahc)); 175 static int verify_seeprom_cksum(struct seeprom_config *sc); 176 177 CFATTACH_DECL(ahc_isa, sizeof(struct ahc_softc), 178 ahc_isa_probe, ahc_isa_attach, NULL, NULL); 179 180 /* 181 * This keeps track of which slots are to be checked next if the 182 * iobase locator is a wildcard. A simple static variable isn't enough, 183 * since it's conceivable that a system might have more than one ISA 184 * bus. 185 * 186 * The "bus" member is the unit number of the parent ISA bus, e.g. "0" 187 * for "isa0". 188 */ 189 struct ahc_isa_slot { 190 LIST_ENTRY(ahc_isa_slot) link; 191 int bus; 192 int slot; 193 }; 194 static LIST_HEAD(, ahc_isa_slot) ahc_isa_all_slots; 195 static int ahc_isa_slot_initialized; 196 197 int 198 ahc_isa_idstring(iot, ioh, idstring) 199 bus_space_tag_t iot; 200 bus_space_handle_t ioh; 201 char *idstring; 202 { 203 u_int8_t vid[EISA_NVIDREGS], pid[EISA_NPIDREGS]; 204 int i; 205 206 /* Get the vendor ID bytes */ 207 for (i = 0; i < EISA_NVIDREGS; i++) { 208 bus_space_write_1(iot, ioh, AHC_ISA_PRIMING, 209 AHC_ISA_PRIMING_VID(i)); 210 vid[i] = bus_space_read_1(iot, ioh, AHC_ISA_VID + i); 211 } 212 213 /* Check for device existence */ 214 if (EISA_VENDID_NODEV(vid)) { 215 #if 0 216 printf("ahc_isa_idstring: no device at 0x%lx\n", 217 ioh); /* XXX knows about ioh guts */ 218 printf("\t(0x%x, 0x%x)\n", vid[0], vid[1]); 219 #endif 220 return (0); 221 } 222 223 /* And check that the firmware didn't biff something badly */ 224 if (EISA_VENDID_IDDELAY(vid)) { 225 printf("ahc_isa_idstring: BIOS biffed it at 0x%lx\n", 226 ioh); /* XXX knows about ioh guts */ 227 return (0); 228 } 229 230 /* Get the product ID bytes */ 231 for (i = 0; i < EISA_NPIDREGS; i++) { 232 bus_space_write_1(iot, ioh, AHC_ISA_PRIMING, 233 AHC_ISA_PRIMING_PID(i)); 234 pid[i] = bus_space_read_1(iot, ioh, AHC_ISA_PID + i); 235 } 236 237 /* Create the ID string from the vendor and product IDs */ 238 idstring[0] = EISA_VENDID_0(vid); 239 idstring[1] = EISA_VENDID_1(vid); 240 idstring[2] = EISA_VENDID_2(vid); 241 idstring[3] = EISA_PRODID_0(pid); 242 idstring[4] = EISA_PRODID_1(pid); 243 idstring[5] = EISA_PRODID_2(pid); 244 idstring[6] = EISA_PRODID_3(pid); 245 idstring[7] = '\0'; /* sanity */ 246 247 return (1); 248 } 249 250 int 251 ahc_isa_match(ia, iobase) 252 struct isa_attach_args *ia; 253 bus_addr_t iobase; 254 { 255 bus_space_tag_t iot = ia->ia_iot; 256 bus_space_handle_t ioh; 257 int irq; 258 char idstring[EISA_IDSTRINGLEN]; 259 260 /* 261 * Get a mapping for the while slot-specific address 262 * space. If we can't, assume nothing's there, but 263 * warn about it. 264 */ 265 if (bus_space_map(iot, iobase, AHC_ISA_IOSIZE, 0, &ioh)) { 266 #if 0 267 /* 268 * Don't print anything out here, since this could 269 * be common on machines configured to look for 270 * ahc_eisa and ahc_isa. 271 */ 272 printf("ahc_isa_match: can't map I/O space for 0x%x\n", 273 iobase); 274 #endif 275 return (0); 276 } 277 278 if (!ahc_isa_idstring(iot, ioh, idstring)) 279 irq = -1; /* cannot get the ID string */ 280 else if (strcmp(idstring, "ADP7756") && 281 strcmp(idstring, "ADP7757")) 282 irq = -1; /* unknown ID strings */ 283 else 284 irq = ahc_aic77xx_irq(iot, ioh); 285 286 bus_space_unmap(iot, ioh, AHC_ISA_IOSIZE); 287 288 if (irq < 0) 289 return (0); 290 291 if (ia->ia_irq[0].ir_irq != ISACF_IRQ_DEFAULT && 292 ia->ia_irq[0].ir_irq != irq) { 293 printf("ahc_isa_match: irq mismatch (kernel %d, card %d)\n", 294 ia->ia_irq[0].ir_irq, irq); 295 return (0); 296 } 297 298 /* We have a match */ 299 ia->ia_nio = 1; 300 ia->ia_io[0].ir_addr = iobase; 301 ia->ia_io[0].ir_size = AHC_ISA_IOSIZE; 302 303 ia->ia_nirq = 1; 304 ia->ia_irq[0].ir_irq = irq; 305 306 ia->ia_ndrq = 0; 307 ia->ia_niomem = 0; 308 309 return (1); 310 } 311 312 /* 313 * Check the slots looking for a board we recognise 314 * If we find one, note it's address (slot) and call 315 * the actual probe routine to check it out. 316 */ 317 int 318 ahc_isa_probe(parent, match, aux) 319 struct device *parent; 320 struct cfdata *match; 321 void *aux; 322 { 323 struct isa_attach_args *ia = aux; 324 struct ahc_isa_slot *as; 325 326 if (ahc_isa_slot_initialized == 0) { 327 LIST_INIT(&ahc_isa_all_slots); 328 ahc_isa_slot_initialized = 1; 329 } 330 331 if (ia->ia_nio < 1) 332 return (0); 333 if (ia->ia_nirq < 1) 334 return (0); 335 336 if (ISA_DIRECT_CONFIG(ia)) 337 return (0); 338 339 if (ia->ia_io[0].ir_addr != ISACF_PORT_DEFAULT) 340 return (ahc_isa_match(ia, ia->ia_io[0].ir_addr)); 341 342 /* 343 * Find this bus's state. If we don't yet have a slot 344 * marker, allocate and initialize one. 345 */ 346 for (as = ahc_isa_all_slots.lh_first; as != NULL; 347 as = as->link.le_next) 348 if (as->bus == parent->dv_unit) 349 goto found_slot_marker; 350 351 /* 352 * Don't have one, so make one. 353 */ 354 as = (struct ahc_isa_slot *) 355 malloc(sizeof(struct ahc_isa_slot), M_DEVBUF, M_NOWAIT); 356 if (as == NULL) 357 panic("ahc_isa_probe: can't allocate slot marker"); 358 359 as->bus = parent->dv_unit; 360 as->slot = AHC_ISA_MIN_SLOT; 361 LIST_INSERT_HEAD(&ahc_isa_all_slots, as, link); 362 363 found_slot_marker: 364 365 for (; as->slot <= AHC_ISA_MAX_SLOT; as->slot++) { 366 if (ahc_isa_match(ia, EISA_SLOT_ADDR(as->slot) + 367 AHC_ISA_SLOT_OFFSET)) { 368 as->slot++; /* next slot to search */ 369 return (1); 370 } 371 } 372 373 /* No matching cards were found. */ 374 return (0); 375 } 376 377 void 378 ahc_isa_attach(parent, self, aux) 379 struct device *parent, *self; 380 void *aux; 381 { 382 struct ahc_softc *ahc = (void *)self; 383 struct isa_attach_args *ia = aux; 384 bus_space_tag_t iot = ia->ia_iot; 385 bus_space_handle_t ioh; 386 int irq, intrtype; 387 const char *intrtypestr; 388 char idstring[EISA_IDSTRINGLEN]; 389 u_char intdef; 390 391 if (bus_space_map(iot, ia->ia_io[0].ir_addr, ia->ia_io[0].ir_size, 392 0, &ioh)) { 393 printf(": can't map i/o space\n"); 394 return; 395 } 396 if (!ahc_isa_idstring(iot, ioh, idstring)) { 397 printf(": can't read ID string\n"); 398 goto free_io; 399 } 400 if ((irq = ahc_aic77xx_irq(iot, ioh)) < 0) { 401 printf(": ahc_aic77xx_irq failed\n"); 402 goto free_io; 403 } 404 405 if (strcmp(idstring, "ADP7756") == 0) { 406 printf(": %s\n", EISA_PRODUCT_ADP7756); 407 } else if (strcmp(idstring, "ADP7757") == 0) { 408 printf(": %s\n", EISA_PRODUCT_ADP7757); 409 } else { 410 printf(": unknown device type %s\n", idstring); 411 goto free_io; 412 } 413 414 /* 415 * Tell the bus-dma interface that we can do 32bit dma 416 * NOTE: this variable is first referenced in ahc_init(). 417 */ 418 ahc->sc_dmaflags = ISABUS_DMA_32BIT; 419 420 ahc_set_name(ahc, ahc->sc_dev.dv_xname); 421 ahc->parent_dmat = ia->ia_dmat; 422 ahc->channel = 'A'; 423 ahc->chip = AHC_AIC7770|AHC_VL; 424 ahc->features = AHC_AIC7770_FE; 425 ahc->bugs |= AHC_TMODE_WIDEODD_BUG; 426 ahc->flags |= AHC_PAGESCBS; 427 ahc->tag = iot; 428 ahc->bsh = ioh; 429 430 if (ahc_softc_init(ahc) != 0) 431 goto free_io; 432 433 ahc_intr_enable(ahc, FALSE); 434 435 if (ahc_reset(ahc) != 0) 436 goto free_io; 437 438 intdef = bus_space_read_1(iot, ioh, INTDEF); 439 440 if (intdef & EDGE_TRIG) { 441 intrtype = IST_EDGE; 442 intrtypestr = "edge triggered"; 443 } else { 444 intrtype = IST_LEVEL; 445 intrtypestr = "level sensitive"; 446 } 447 ahc->ih = isa_intr_establish(ia->ia_ic, irq, 448 intrtype, IPL_BIO, ahc_intr, ahc); 449 if (ahc->ih == NULL) { 450 printf("%s: couldn't establish %s interrupt\n", 451 ahc->sc_dev.dv_xname, intrtypestr); 452 goto free_io; 453 } 454 455 /* 456 * Tell the user what type of interrupts we're using. 457 * usefull for debugging irq problems 458 */ 459 if (bootverbose) { 460 printf("%s: Using %s interrupts\n", 461 ahc->sc_dev.dv_xname, intrtypestr); 462 } 463 464 /* 465 * Now that we know we own the resources we need, do the 466 * card initialization. 467 */ 468 aha2840_load_seeprom(ahc); 469 470 /* Attach sub-devices */ 471 if (ahc_aic77xx_attach(ahc) == 0) 472 return; /* succeed */ 473 474 /* failed */ 475 isa_intr_disestablish(ia->ia_ic, ahc->ih); 476 free_io: 477 bus_space_unmap(iot, ioh, ia->ia_io[0].ir_size); 478 } 479 480 /* 481 * Read the 284x SEEPROM. 482 */ 483 void 484 aha2840_load_seeprom(struct ahc_softc *ahc) 485 { 486 struct seeprom_descriptor sd; 487 struct seeprom_config sc; 488 u_int8_t scsi_conf; 489 int have_seeprom; 490 491 sd.sd_tag = ahc->tag; 492 sd.sd_bsh = ahc->bsh; 493 sd.sd_control_offset = SEECTL_2840; 494 sd.sd_status_offset = STATUS_2840; 495 sd.sd_dataout_offset = STATUS_2840; 496 sd.sd_chip = C46; 497 sd.sd_MS = 0; 498 sd.sd_RDY = EEPROM_TF; 499 sd.sd_CS = CS_2840; 500 sd.sd_CK = CK_2840; 501 sd.sd_DO = DO_2840; 502 sd.sd_DI = DI_2840; 503 504 if (bootverbose) 505 printf("%s: Reading SEEPROM...", ahc_name(ahc)); 506 have_seeprom = read_seeprom(&sd, (u_int16_t *)&sc, 507 /*start_addr*/0, sizeof(sc)/2); 508 509 if (have_seeprom) { 510 if (verify_seeprom_cksum(&sc) == 0) { 511 if(bootverbose) 512 printf ("checksum error\n"); 513 have_seeprom = 0; 514 } else if (bootverbose) { 515 printf("done.\n"); 516 } 517 } 518 519 if (!have_seeprom) { 520 if (bootverbose) 521 printf("%s: No SEEPROM available\n", ahc_name(ahc)); 522 ahc->flags |= AHC_USEDEFAULTS; 523 } else { 524 /* 525 * Put the data we've collected down into SRAM 526 * where ahc_init will find it. 527 */ 528 int i; 529 int max_targ = (ahc->features & AHC_WIDE) != 0 ? 16 : 8; 530 u_int16_t discenable; 531 532 discenable = 0; 533 for (i = 0; i < max_targ; i++){ 534 u_int8_t target_settings; 535 target_settings = (sc.device_flags[i] & CFXFER) << 4; 536 if (sc.device_flags[i] & CFSYNCH) 537 target_settings |= SOFS; 538 if (sc.device_flags[i] & CFWIDEB) 539 target_settings |= WIDEXFER; 540 if (sc.device_flags[i] & CFDISC) 541 discenable |= (0x01 << i); 542 ahc_outb(ahc, TARG_SCSIRATE + i, target_settings); 543 } 544 ahc_outb(ahc, DISC_DSB, ~(discenable & 0xff)); 545 ahc_outb(ahc, DISC_DSB + 1, ~((discenable >> 8) & 0xff)); 546 547 ahc->our_id = sc.brtime_id & CFSCSIID; 548 549 scsi_conf = (ahc->our_id & 0x7); 550 if (sc.adapter_control & CFSPARITY) 551 scsi_conf |= ENSPCHK; 552 if (sc.adapter_control & CFRESETB) 553 scsi_conf |= RESET_SCSI; 554 555 if (sc.bios_control & CF284XEXTEND) 556 ahc->flags |= AHC_EXTENDED_TRANS_A; 557 /* Set SCSICONF info */ 558 ahc_outb(ahc, SCSICONF, scsi_conf); 559 560 if (sc.adapter_control & CF284XSTERM) 561 ahc->flags |= AHC_TERM_ENB_A; 562 } 563 } 564 565 static int 566 verify_seeprom_cksum(struct seeprom_config *sc) 567 { 568 int i; 569 int maxaddr; 570 uint32_t checksum; 571 uint16_t *scarray; 572 573 maxaddr = (sizeof(*sc)/2) - 1; 574 checksum = 0; 575 scarray = (uint16_t *)sc; 576 577 for (i = 0; i < maxaddr; i++) 578 checksum = checksum + scarray[i]; 579 if (checksum == 0 580 || (checksum & 0xFFFF) != sc->checksum) { 581 return (0); 582 } else { 583 return(1); 584 } 585 } 586
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