Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/le/lance.c
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1 /* $NetBSD: lance.c,v 1.34 2005/12/24 20:27:30 perry Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD 5 * 6 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace 11 * Simulation Facility, NASA Ames Research Center. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /*- 36 * Copyright (c) 1992, 1993 37 * The Regents of the University of California. All rights reserved. 38 * 39 * This code is derived from software contributed to Berkeley by 40 * Ralph Campbell and Rick Macklem. 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. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)if_le.c 8.2 (Berkeley) 11/16/93 67 */ 68 69 #include <sys/cdefs.h> 70 __FBSDID("$FreeBSD$"); 71 72 #include <sys/param.h> 73 #include <sys/bus.h> 74 #include <sys/endian.h> 75 #include <sys/lock.h> 76 #include <sys/kernel.h> 77 #include <sys/malloc.h> 78 #include <sys/mbuf.h> 79 #include <sys/mutex.h> 80 #include <sys/socket.h> 81 #include <sys/sockio.h> 82 83 #include <net/ethernet.h> 84 #include <net/if.h> 85 #include <net/if_var.h> 86 #include <net/if_arp.h> 87 #include <net/if_dl.h> 88 #include <net/if_media.h> 89 #include <net/if_types.h> 90 #include <net/if_vlan_var.h> 91 92 #include <machine/bus.h> 93 94 #include <dev/le/lancereg.h> 95 #include <dev/le/lancevar.h> 96 97 devclass_t le_devclass; 98 99 static void lance_start(struct ifnet *); 100 static void lance_stop(struct lance_softc *); 101 static void lance_init(void *); 102 static void lance_watchdog(void *s); 103 static int lance_mediachange(struct ifnet *); 104 static void lance_mediastatus(struct ifnet *, struct ifmediareq *); 105 static int lance_ioctl(struct ifnet *, u_long, caddr_t); 106 107 int 108 lance_config(struct lance_softc *sc, const char* name, int unit) 109 { 110 struct ifnet *ifp; 111 int i, nbuf; 112 113 if (LE_LOCK_INITIALIZED(sc) == 0) 114 return (ENXIO); 115 116 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 117 if (ifp == NULL) 118 return (ENOSPC); 119 120 callout_init_mtx(&sc->sc_wdog_ch, &sc->sc_mtx, 0); 121 122 /* Initialize ifnet structure. */ 123 ifp->if_softc = sc; 124 if_initname(ifp, name, unit); 125 ifp->if_start = lance_start; 126 ifp->if_ioctl = lance_ioctl; 127 ifp->if_init = lance_init; 128 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 129 #ifdef LANCE_REVC_BUG 130 ifp->if_flags &= ~IFF_MULTICAST; 131 #endif 132 ifp->if_baudrate = IF_Mbps(10); 133 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 134 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 135 IFQ_SET_READY(&ifp->if_snd); 136 137 /* Initialize ifmedia structures. */ 138 ifmedia_init(&sc->sc_media, 0, lance_mediachange, lance_mediastatus); 139 if (sc->sc_supmedia != NULL) { 140 for (i = 0; i < sc->sc_nsupmedia; i++) 141 ifmedia_add(&sc->sc_media, sc->sc_supmedia[i], 0, NULL); 142 ifmedia_set(&sc->sc_media, sc->sc_defaultmedia); 143 } else { 144 ifmedia_add(&sc->sc_media, 145 IFM_MAKEWORD(IFM_ETHER, IFM_MANUAL, 0, 0), 0, NULL); 146 ifmedia_set(&sc->sc_media, 147 IFM_MAKEWORD(IFM_ETHER, IFM_MANUAL, 0, 0)); 148 } 149 150 switch (sc->sc_memsize) { 151 case 8192: 152 sc->sc_nrbuf = 4; 153 sc->sc_ntbuf = 1; 154 break; 155 case 16384: 156 sc->sc_nrbuf = 8; 157 sc->sc_ntbuf = 2; 158 break; 159 case 32768: 160 sc->sc_nrbuf = 16; 161 sc->sc_ntbuf = 4; 162 break; 163 case 65536: 164 sc->sc_nrbuf = 32; 165 sc->sc_ntbuf = 8; 166 break; 167 case 131072: 168 sc->sc_nrbuf = 64; 169 sc->sc_ntbuf = 16; 170 break; 171 case 262144: 172 sc->sc_nrbuf = 128; 173 sc->sc_ntbuf = 32; 174 break; 175 default: 176 /* weird memory size; cope with it */ 177 nbuf = sc->sc_memsize / LEBLEN; 178 sc->sc_ntbuf = nbuf / 5; 179 sc->sc_nrbuf = nbuf - sc->sc_ntbuf; 180 } 181 182 if_printf(ifp, "%d receive buffers, %d transmit buffers\n", 183 sc->sc_nrbuf, sc->sc_ntbuf); 184 185 /* Make sure the chip is stopped. */ 186 LE_LOCK(sc); 187 lance_stop(sc); 188 LE_UNLOCK(sc); 189 190 return (0); 191 } 192 193 void 194 lance_attach(struct lance_softc *sc) 195 { 196 struct ifnet *ifp = sc->sc_ifp; 197 198 /* Attach the interface. */ 199 ether_ifattach(ifp, sc->sc_enaddr); 200 201 /* Claim 802.1q capability. */ 202 ifp->if_hdrlen = sizeof(struct ether_vlan_header); 203 ifp->if_capabilities |= IFCAP_VLAN_MTU; 204 ifp->if_capenable |= IFCAP_VLAN_MTU; 205 } 206 207 void 208 lance_detach(struct lance_softc *sc) 209 { 210 struct ifnet *ifp = sc->sc_ifp; 211 212 LE_LOCK(sc); 213 lance_stop(sc); 214 LE_UNLOCK(sc); 215 callout_drain(&sc->sc_wdog_ch); 216 ether_ifdetach(ifp); 217 if_free(ifp); 218 } 219 220 void 221 lance_suspend(struct lance_softc *sc) 222 { 223 224 LE_LOCK(sc); 225 lance_stop(sc); 226 LE_UNLOCK(sc); 227 } 228 229 void 230 lance_resume(struct lance_softc *sc) 231 { 232 233 LE_LOCK(sc); 234 if (sc->sc_ifp->if_flags & IFF_UP) 235 lance_init_locked(sc); 236 LE_UNLOCK(sc); 237 } 238 239 static void 240 lance_start(struct ifnet *ifp) 241 { 242 struct lance_softc *sc = ifp->if_softc; 243 244 LE_LOCK(sc); 245 (*sc->sc_start_locked)(sc); 246 LE_UNLOCK(sc); 247 } 248 249 static void 250 lance_stop(struct lance_softc *sc) 251 { 252 struct ifnet *ifp = sc->sc_ifp; 253 254 LE_LOCK_ASSERT(sc, MA_OWNED); 255 256 /* 257 * Mark the interface down and cancel the watchdog timer. 258 */ 259 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); 260 callout_stop(&sc->sc_wdog_ch); 261 sc->sc_wdog_timer = 0; 262 263 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP); 264 } 265 266 static void 267 lance_init(void *xsc) 268 { 269 struct lance_softc *sc = (struct lance_softc *)xsc; 270 271 LE_LOCK(sc); 272 lance_init_locked(sc); 273 LE_UNLOCK(sc); 274 } 275 276 /* 277 * Initialization of interface; set up initialization block 278 * and transmit/receive descriptor rings. 279 */ 280 void 281 lance_init_locked(struct lance_softc *sc) 282 { 283 struct ifnet *ifp = sc->sc_ifp; 284 u_long a; 285 int timo; 286 287 LE_LOCK_ASSERT(sc, MA_OWNED); 288 289 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP); 290 DELAY(100); 291 292 /* Newer LANCE chips have a reset register. */ 293 if (sc->sc_hwreset) 294 (*sc->sc_hwreset)(sc); 295 296 /* Set the correct byte swapping mode, etc. */ 297 (*sc->sc_wrcsr)(sc, LE_CSR3, sc->sc_conf3); 298 299 /* Set the current media. This may require the chip to be stopped. */ 300 if (sc->sc_mediachange) 301 (void)(*sc->sc_mediachange)(sc); 302 303 /* 304 * Update our private copy of the Ethernet address. 305 * We NEED the copy so we can ensure its alignment! 306 */ 307 memcpy(sc->sc_enaddr, IF_LLADDR(ifp), ETHER_ADDR_LEN); 308 309 /* Set up LANCE init block. */ 310 (*sc->sc_meminit)(sc); 311 312 /* Give LANCE the physical address of its init block. */ 313 a = sc->sc_addr + LE_INITADDR(sc); 314 (*sc->sc_wrcsr)(sc, LE_CSR1, a & 0xffff); 315 (*sc->sc_wrcsr)(sc, LE_CSR2, a >> 16); 316 317 /* Try to initialize the LANCE. */ 318 DELAY(100); 319 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INIT); 320 321 /* Wait for initialization to finish. */ 322 for (timo = 100000; timo; timo--) 323 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) 324 break; 325 326 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) { 327 /* Start the LANCE. */ 328 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA | LE_C0_STRT); 329 ifp->if_drv_flags |= IFF_DRV_RUNNING; 330 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 331 sc->sc_wdog_timer = 0; 332 callout_reset(&sc->sc_wdog_ch, hz, lance_watchdog, sc); 333 (*sc->sc_start_locked)(sc); 334 } else 335 if_printf(ifp, "controller failed to initialize\n"); 336 337 if (sc->sc_hwinit) 338 (*sc->sc_hwinit)(sc); 339 } 340 341 /* 342 * Routine to copy from mbuf chain to transmit buffer in 343 * network buffer memory. 344 */ 345 int 346 lance_put(struct lance_softc *sc, int boff, struct mbuf *m) 347 { 348 struct mbuf *n; 349 int len, tlen = 0; 350 351 LE_LOCK_ASSERT(sc, MA_OWNED); 352 353 for (; m; m = n) { 354 len = m->m_len; 355 if (len == 0) { 356 n = m_free(m); 357 m = NULL; 358 continue; 359 } 360 (*sc->sc_copytobuf)(sc, mtod(m, caddr_t), boff, len); 361 boff += len; 362 tlen += len; 363 n = m_free(m); 364 m = NULL; 365 } 366 if (tlen < LEMINSIZE) { 367 (*sc->sc_zerobuf)(sc, boff, LEMINSIZE - tlen); 368 tlen = LEMINSIZE; 369 } 370 return (tlen); 371 } 372 373 /* 374 * Pull data off an interface. 375 * Len is length of data, with local net header stripped. 376 * We copy the data into mbufs. When full cluster sized units are present 377 * we copy into clusters. 378 */ 379 struct mbuf * 380 lance_get(struct lance_softc *sc, int boff, int totlen) 381 { 382 struct ifnet *ifp = sc->sc_ifp; 383 struct mbuf *m, *m0, *newm; 384 caddr_t newdata; 385 int len; 386 387 if (totlen <= ETHER_HDR_LEN || totlen > LEBLEN - ETHER_CRC_LEN) { 388 #ifdef LEDEBUG 389 if_printf(ifp, "invalid packet size %d; dropping\n", totlen); 390 #endif 391 return (NULL); 392 } 393 394 MGETHDR(m0, M_NOWAIT, MT_DATA); 395 if (m0 == NULL) 396 return (NULL); 397 m0->m_pkthdr.rcvif = ifp; 398 m0->m_pkthdr.len = totlen; 399 len = MHLEN; 400 m = m0; 401 402 while (totlen > 0) { 403 if (totlen >= MINCLSIZE) { 404 if (!(MCLGET(m, M_NOWAIT))) 405 goto bad; 406 len = MCLBYTES; 407 } 408 409 if (m == m0) { 410 newdata = (caddr_t) 411 ALIGN(m->m_data + ETHER_HDR_LEN) - ETHER_HDR_LEN; 412 len -= newdata - m->m_data; 413 m->m_data = newdata; 414 } 415 416 m->m_len = len = min(totlen, len); 417 (*sc->sc_copyfrombuf)(sc, mtod(m, caddr_t), boff, len); 418 boff += len; 419 420 totlen -= len; 421 if (totlen > 0) { 422 MGET(newm, M_NOWAIT, MT_DATA); 423 if (newm == NULL) 424 goto bad; 425 len = MLEN; 426 m = m->m_next = newm; 427 } 428 } 429 430 return (m0); 431 432 bad: 433 m_freem(m0); 434 return (NULL); 435 } 436 437 static void 438 lance_watchdog(void *xsc) 439 { 440 struct lance_softc *sc = (struct lance_softc *)xsc; 441 struct ifnet *ifp = sc->sc_ifp; 442 443 LE_LOCK_ASSERT(sc, MA_OWNED); 444 445 if (sc->sc_wdog_timer == 0 || --sc->sc_wdog_timer != 0) { 446 callout_reset(&sc->sc_wdog_ch, hz, lance_watchdog, sc); 447 return; 448 } 449 450 if_printf(ifp, "device timeout\n"); 451 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 452 lance_init_locked(sc); 453 } 454 455 static int 456 lance_mediachange(struct ifnet *ifp) 457 { 458 struct lance_softc *sc = ifp->if_softc; 459 460 if (sc->sc_mediachange) { 461 /* 462 * For setting the port in LE_CSR15 the PCnet chips must 463 * be powered down or stopped and unlike documented may 464 * not take effect without an initialization. So don't 465 * invoke (*sc_mediachange) directly here but go through 466 * lance_init_locked(). 467 */ 468 LE_LOCK(sc); 469 lance_stop(sc); 470 lance_init_locked(sc); 471 if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) 472 (*sc->sc_start_locked)(sc); 473 LE_UNLOCK(sc); 474 } 475 return (0); 476 } 477 478 static void 479 lance_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr) 480 { 481 struct lance_softc *sc = ifp->if_softc; 482 483 LE_LOCK(sc); 484 if (!(ifp->if_flags & IFF_UP)) { 485 LE_UNLOCK(sc); 486 return; 487 } 488 489 ifmr->ifm_status = IFM_AVALID; 490 if (sc->sc_flags & LE_CARRIER) 491 ifmr->ifm_status |= IFM_ACTIVE; 492 493 if (sc->sc_mediastatus) 494 (*sc->sc_mediastatus)(sc, ifmr); 495 LE_UNLOCK(sc); 496 } 497 498 /* 499 * Process an ioctl request. 500 */ 501 static int 502 lance_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 503 { 504 struct lance_softc *sc = ifp->if_softc; 505 struct ifreq *ifr = (struct ifreq *)data; 506 int error = 0; 507 508 switch (cmd) { 509 case SIOCSIFFLAGS: 510 LE_LOCK(sc); 511 if (ifp->if_flags & IFF_PROMISC) { 512 if (!(sc->sc_flags & LE_PROMISC)) { 513 sc->sc_flags |= LE_PROMISC; 514 lance_init_locked(sc); 515 } 516 } else if (sc->sc_flags & LE_PROMISC) { 517 sc->sc_flags &= ~LE_PROMISC; 518 lance_init_locked(sc); 519 } 520 521 if ((ifp->if_flags & IFF_ALLMULTI) && 522 !(sc->sc_flags & LE_ALLMULTI)) { 523 sc->sc_flags |= LE_ALLMULTI; 524 lance_init_locked(sc); 525 } else if (!(ifp->if_flags & IFF_ALLMULTI) && 526 (sc->sc_flags & LE_ALLMULTI)) { 527 sc->sc_flags &= ~LE_ALLMULTI; 528 lance_init_locked(sc); 529 } 530 531 if (!(ifp->if_flags & IFF_UP) && 532 ifp->if_drv_flags & IFF_DRV_RUNNING) { 533 /* 534 * If interface is marked down and it is running, then 535 * stop it. 536 */ 537 lance_stop(sc); 538 } else if (ifp->if_flags & IFF_UP && 539 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 540 /* 541 * If interface is marked up and it is stopped, then 542 * start it. 543 */ 544 lance_init_locked(sc); 545 } 546 #ifdef LEDEBUG 547 if (ifp->if_flags & IFF_DEBUG) 548 sc->sc_flags |= LE_DEBUG; 549 else 550 sc->sc_flags &= ~LE_DEBUG; 551 #endif 552 LE_UNLOCK(sc); 553 break; 554 555 case SIOCADDMULTI: 556 case SIOCDELMULTI: 557 /* 558 * Multicast list has changed; set the hardware filter 559 * accordingly. 560 */ 561 LE_LOCK(sc); 562 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 563 lance_init_locked(sc); 564 LE_UNLOCK(sc); 565 break; 566 567 case SIOCGIFMEDIA: 568 case SIOCSIFMEDIA: 569 error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd); 570 break; 571 572 default: 573 error = ether_ioctl(ifp, cmd, data); 574 break; 575 } 576 577 return (error); 578 } 579 580 /* 581 * Set up the logical address filter. 582 */ 583 void 584 lance_setladrf(struct lance_softc *sc, uint16_t *af) 585 { 586 struct ifnet *ifp = sc->sc_ifp; 587 struct ifmultiaddr *ifma; 588 uint32_t crc; 589 590 /* 591 * Set up multicast address filter by passing all multicast addresses 592 * through a crc generator, and then using the high order 6 bits as an 593 * index into the 64 bit logical address filter. The high order bit 594 * selects the word, while the rest of the bits select the bit within 595 * the word. 596 */ 597 598 if (ifp->if_flags & IFF_PROMISC || sc->sc_flags & LE_ALLMULTI) { 599 af[0] = af[1] = af[2] = af[3] = 0xffff; 600 return; 601 } 602 603 af[0] = af[1] = af[2] = af[3] = 0x0000; 604 if_maddr_rlock(ifp); 605 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 606 if (ifma->ifma_addr->sa_family != AF_LINK) 607 continue; 608 609 crc = ether_crc32_le(LLADDR((struct sockaddr_dl *) 610 ifma->ifma_addr), ETHER_ADDR_LEN); 611 612 /* Just want the 6 most significant bits. */ 613 crc >>= 26; 614 615 /* Set the corresponding bit in the filter. */ 616 af[crc >> 4] |= LE_HTOLE16(1 << (crc & 0xf)); 617 } 618 if_maddr_runlock(ifp); 619 } 620 621 /* 622 * Routines for accessing the transmit and receive buffers. 623 * The various CPU and adapter configurations supported by this 624 * driver require three different access methods for buffers 625 * and descriptors: 626 * (1) contig (contiguous data; no padding), 627 * (2) gap2 (two bytes of data followed by two bytes of padding), 628 * (3) gap16 (16 bytes of data followed by 16 bytes of padding). 629 */ 630 631 /* 632 * contig: contiguous data with no padding. 633 * 634 * Buffers may have any alignment. 635 */ 636 637 void 638 lance_copytobuf_contig(struct lance_softc *sc, void *from, int boff, int len) 639 { 640 volatile caddr_t buf = sc->sc_mem; 641 642 /* 643 * Just call memcpy() to do the work. 644 */ 645 memcpy(buf + boff, from, len); 646 } 647 648 void 649 lance_copyfrombuf_contig(struct lance_softc *sc, void *to, int boff, int len) 650 { 651 volatile caddr_t buf = sc->sc_mem; 652 653 /* 654 * Just call memcpy() to do the work. 655 */ 656 memcpy(to, buf + boff, len); 657 } 658 659 void 660 lance_zerobuf_contig(struct lance_softc *sc, int boff, int len) 661 { 662 volatile caddr_t buf = sc->sc_mem; 663 664 /* 665 * Just let memset() do the work 666 */ 667 memset(buf + boff, 0, len); 668 } 669 670 #if 0 671 /* 672 * Examples only; duplicate these and tweak (if necessary) in 673 * machine-specific front-ends. 674 */ 675 676 /* 677 * gap2: two bytes of data followed by two bytes of pad. 678 * 679 * Buffers must be 4-byte aligned. The code doesn't worry about 680 * doing an extra byte. 681 */ 682 683 static void 684 lance_copytobuf_gap2(struct lance_softc *sc, void *fromv, int boff, int len) 685 { 686 volatile caddr_t buf = sc->sc_mem; 687 caddr_t from = fromv; 688 volatile uint16_t *bptr; 689 690 if (boff & 0x1) { 691 /* Handle unaligned first byte. */ 692 bptr = ((volatile uint16_t *)buf) + (boff - 1); 693 *bptr = (*from++ << 8) | (*bptr & 0xff); 694 bptr += 2; 695 len--; 696 } else 697 bptr = ((volatile uint16_t *)buf) + boff; 698 while (len > 1) { 699 *bptr = (from[1] << 8) | (from[0] & 0xff); 700 bptr += 2; 701 from += 2; 702 len -= 2; 703 } 704 if (len == 1) 705 *bptr = (uint16_t)*from; 706 } 707 708 static void 709 lance_copyfrombuf_gap2(struct lance_softc *sc, void *tov, int boff, int len) 710 { 711 volatile caddr_t buf = sc->sc_mem; 712 caddr_t to = tov; 713 volatile uint16_t *bptr; 714 uint16_t tmp; 715 716 if (boff & 0x1) { 717 /* Handle unaligned first byte. */ 718 bptr = ((volatile uint16_t *)buf) + (boff - 1); 719 *to++ = (*bptr >> 8) & 0xff; 720 bptr += 2; 721 len--; 722 } else 723 bptr = ((volatile uint16_t *)buf) + boff; 724 while (len > 1) { 725 tmp = *bptr; 726 *to++ = tmp & 0xff; 727 *to++ = (tmp >> 8) & 0xff; 728 bptr += 2; 729 len -= 2; 730 } 731 if (len == 1) 732 *to = *bptr & 0xff; 733 } 734 735 static void 736 lance_zerobuf_gap2(struct lance_softc *sc, int boff, int len) 737 { 738 volatile caddr_t buf = sc->sc_mem; 739 volatile uint16_t *bptr; 740 741 if ((unsigned)boff & 0x1) { 742 bptr = ((volatile uint16_t *)buf) + (boff - 1); 743 *bptr &= 0xff; 744 bptr += 2; 745 len--; 746 } else 747 bptr = ((volatile uint16_t *)buf) + boff; 748 while (len > 0) { 749 *bptr = 0; 750 bptr += 2; 751 len -= 2; 752 } 753 } 754 755 /* 756 * gap16: 16 bytes of data followed by 16 bytes of pad. 757 * 758 * Buffers must be 32-byte aligned. 759 */ 760 761 static void 762 lance_copytobuf_gap16(struct lance_softc *sc, void *fromv, int boff, int len) 763 { 764 volatile caddr_t buf = sc->sc_mem; 765 caddr_t bptr, from = fromv; 766 int xfer; 767 768 bptr = buf + ((boff << 1) & ~0x1f); 769 boff &= 0xf; 770 xfer = min(len, 16 - boff); 771 while (len > 0) { 772 memcpy(bptr + boff, from, xfer); 773 from += xfer; 774 bptr += 32; 775 boff = 0; 776 len -= xfer; 777 xfer = min(len, 16); 778 } 779 } 780 781 static void 782 lance_copyfrombuf_gap16(struct lance_softc *sc, void *tov, int boff, int len) 783 { 784 volatile caddr_t buf = sc->sc_mem; 785 caddr_t bptr, to = tov; 786 int xfer; 787 788 bptr = buf + ((boff << 1) & ~0x1f); 789 boff &= 0xf; 790 xfer = min(len, 16 - boff); 791 while (len > 0) { 792 memcpy(to, bptr + boff, xfer); 793 to += xfer; 794 bptr += 32; 795 boff = 0; 796 len -= xfer; 797 xfer = min(len, 16); 798 } 799 } 800 801 static void 802 lance_zerobuf_gap16(struct lance_softc *sc, int boff, int len) 803 { 804 volatile caddr_t buf = sc->sc_mem; 805 caddr_t bptr; 806 int xfer; 807 808 bptr = buf + ((boff << 1) & ~0x1f); 809 boff &= 0xf; 810 xfer = min(len, 16 - boff); 811 while (len > 0) { 812 memset(bptr + boff, 0, xfer); 813 bptr += 32; 814 boff = 0; 815 len -= xfer; 816 xfer = min(len, 16); 817 } 818 } 819 #endif /* Example only */
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