ne2000.c revision 1.8
1 /* $NetBSD: ne2000.c,v 1.8 1998/01/26 20:30:09 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998 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 of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Device driver for National Semiconductor DS8390/WD83C690 based ethernet 42 * adapters. 43 * 44 * Copyright (c) 1994, 1995 Charles M. Hannum. All rights reserved. 45 * 46 * Copyright (C) 1993, David Greenman. This software may be used, modified, 47 * copied, distributed, and sold, in both source and binary form provided that 48 * the above copyright and these terms are retained. Under no circumstances is 49 * the author responsible for the proper functioning of this software, nor does 50 * the author assume any responsibility for damages incurred with its use. 51 */ 52 53 /* 54 * Common code shared by all NE2000-compatible Ethernet interfaces. 55 */ 56 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/device.h> 60 #include <sys/socket.h> 61 #include <sys/mbuf.h> 62 #include <sys/syslog.h> 63 64 #include <net/if.h> 65 #include <net/if_dl.h> 66 #include <net/if_types.h> 67 #include <net/if_media.h> 68 69 #include <net/if_ether.h> 70 71 #include <machine/bus.h> 72 73 #include <dev/ic/dp8390reg.h> 74 #include <dev/ic/dp8390var.h> 75 76 #include <dev/ic/ne2000reg.h> 77 #include <dev/ic/ne2000var.h> 78 79 int ne2000_write_mbuf __P((struct dp8390_softc *, struct mbuf *, int)); 80 int ne2000_ring_copy __P((struct dp8390_softc *, int, caddr_t, u_short)); 81 void ne2000_read_hdr __P((struct dp8390_softc *, int, struct dp8390_ring *)); 82 int ne2000_test_mem __P((struct dp8390_softc *)); 83 84 void ne2000_writemem __P((bus_space_tag_t, bus_space_handle_t, 85 bus_space_tag_t, bus_space_handle_t, u_int8_t *, int, size_t, int)); 86 void ne2000_readmem __P((bus_space_tag_t, bus_space_handle_t, 87 bus_space_tag_t, bus_space_handle_t, int, u_int8_t *, size_t, int)); 88 89 void 90 ne2000_attach(nsc, myea) 91 struct ne2000_softc *nsc; 92 u_int8_t *myea; 93 { 94 struct dp8390_softc *dsc = &nsc->sc_dp8390; 95 bus_space_tag_t nict = dsc->sc_regt; 96 bus_space_handle_t nich = dsc->sc_regh; 97 bus_space_tag_t asict = nsc->sc_asict; 98 bus_space_handle_t asich = nsc->sc_asich; 99 u_int8_t romdata[16]; 100 int memsize, i, useword; 101 102 /* 103 * Detect it again; this gives us the memory size. 104 */ 105 nsc->sc_type = ne2000_detect(nict, nich, asict, asich); 106 if (nsc->sc_type == 0) { 107 printf("%s: where did the card go?\n", dsc->sc_dev.dv_xname); 108 return; 109 } 110 111 useword = (nsc->sc_type == NE2000_TYPE_NE2000); 112 113 dsc->cr_proto = ED_CR_RD2; 114 115 /* 116 * DCR gets: 117 * 118 * FIFO threshold to 8, No auto-init Remote DMA, 119 * byte order=80x86. 120 * 121 * NE1000 gets byte-wide DMA, NE2000 gets word-wide DMA. 122 */ 123 dsc->dcr_reg = ED_DCR_FT1 | ED_DCR_LS | 124 (nsc->sc_type == NE2000_TYPE_NE2000 ? ED_DCR_WTS : 0); 125 126 dsc->test_mem = ne2000_test_mem; 127 dsc->ring_copy = ne2000_ring_copy; 128 dsc->write_mbuf = ne2000_write_mbuf; 129 dsc->read_hdr = ne2000_read_hdr; 130 131 /* Registers are linear. */ 132 for (i = 0; i < 16; i++) 133 dsc->sc_reg_map[i] = i; 134 135 /* 136 * 8k of memory plus an additional 8k if an NE2000. 137 */ 138 memsize = 8192 + (nsc->sc_type == NE2000_TYPE_NE2000 ? 8192 : 0); 139 140 /* 141 * NIC memory doens't start at zero on an NE board. 142 * The start address is tied to the bus width. 143 * (It happens to be computed the same way as mem size.) 144 */ 145 dsc->mem_start = memsize; 146 147 #ifdef GWETHER 148 { 149 int x, mstart = 0; 150 int8_t pbuf0[ED_PAGE_SIZE], pbuf[ED_PAGE_SIZE], 151 tbuf[ED_PAGE_SIZE]; 152 153 for (i = 0; i < ED_PAGE_SIZE; i++) 154 pbuf0[i] = 0; 155 156 /* Search for the start of RAM. */ 157 for (x = 1; x < 256; x++) { 158 ne2000_writemem(nict, nich, asict, asich, pbuf0, 159 x << ED_PAGE_SHIFT, ED_PAGE_SIZE, useword); 160 ne2000_readmem(nict, nich, asict, asich, 161 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, useword); 162 if (bcmp(pbuf0, tbuf, ED_PAGE_SIZE) == 0) { 163 for (i = 0; i < ED_PAGE_SIZE; i++) 164 pbuf[i] = 255 - x; 165 ne2000_writemem(nict, nich, asict, asich, 166 pbuf, x << ED_PAGE_SHIFT, ED_PAGE_SIZE, 167 useword); 168 ne2000_readmem(nict, nich, asict, asich, 169 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, 170 useword); 171 if (bcmp(pbuf, tbuf, ED_PAGE_SIZE) == 0) { 172 mstart = x << ED_PAGE_SHIFT; 173 memsize = ED_PAGE_SIZE; 174 break; 175 } 176 } 177 } 178 179 if (mstart == 0) { 180 printf("%s: cannot find start of RAM\n", 181 dsc->sc_dev.dv_xname); 182 return; 183 } 184 185 /* Search for the end of RAM. */ 186 for (++x; x < 256; x++) { 187 ne2000_writemem(nict, nich, asict, asich, pbuf0, 188 x << ED_PAGE_SHIFT, ED_PAGE_SIZE, useword); 189 ne2000_readmem(nict, nich, asict, asich, 190 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, useword); 191 if (bcmp(pbuf0, tbuf, ED_PAGE_SIZE) == 0) { 192 for (i = 0; i < ED_PAGE_SIZE; i++) 193 pbuf[i] = 255 - x; 194 ne2000_writemem(nict, nich, asict, asich, 195 pbuf, x << ED_PAGE_SHIFT, ED_PAGE_SIZE, 196 useword); 197 ne2000_readmem(nict, nich, asict, asich, 198 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE 199 useword); 200 if (bcmp(pbuf, tbuf, ED_PAGE_SIZE) == 0) 201 memsize += ED_PAGE_SIZE; 202 else 203 break; 204 } else 205 break; 206 } 207 208 printf("%s: RAM start 0x%x, size %d\n", 209 dsc->sc_dev.dv_xname, mstart, msize); 210 211 dsc->mem_start = mstart; 212 } 213 #endif /* GWETHER */ 214 215 dsc->mem_size = memsize; 216 217 if (myea == NULL) { 218 /* Read the station address. */ 219 ne2000_readmem(nict, nich, asict, asich, 0, romdata, 220 sizeof(romdata), useword); 221 for (i = 0; i < ETHER_ADDR_LEN; i++) 222 dsc->sc_enaddr[i] = romdata[i * (useword ? 2 : 1)]; 223 } else 224 bcopy(myea, dsc->sc_enaddr, sizeof(dsc->sc_enaddr)); 225 226 /* Clear any pending interrupts that might have occurred above. */ 227 bus_space_write_1(nict, nich, ED_P0_ISR, 0xff); 228 229 if (dp8390_config(dsc, NULL, 0, 0)) { 230 printf("%s: setup failed\n", dsc->sc_dev.dv_xname); 231 return; 232 } 233 234 /* 235 * We need to compute mem_ring a bit differently; override the 236 * value set up in dp8390_config(). 237 */ 238 dsc->mem_ring = 239 dsc->mem_start + ((dsc->txb_cnt * ED_TXBUF_SIZE) << ED_PAGE_SHIFT); 240 } 241 242 /* 243 * Detect an NE-2000 or compatible. Returns a model code. 244 */ 245 int 246 ne2000_detect(nict, nich, asict, asich) 247 bus_space_tag_t nict; 248 bus_space_handle_t nich; 249 bus_space_tag_t asict; 250 bus_space_handle_t asich; 251 { 252 static u_int8_t test_pattern[32] = "THIS is A memory TEST pattern"; 253 u_int8_t test_buffer[32], tmp; 254 int i, rv = 0; 255 256 /* Reset the board. */ 257 #ifdef GWETHER 258 bus_space_write_1(asict, asich, NE2000_ASIC_RESET, 0); 259 delay(200); 260 #endif /* GWETHER */ 261 tmp = bus_space_read_1(asict, asich, NE2000_ASIC_RESET); 262 delay(10000); 263 264 /* 265 * I don't know if this is necessary; probably cruft leftover from 266 * Clarkson packet driver code. Doesn't do a thing on the boards I've 267 * tested. -DG [note that a outb(0x84, 0) seems to work here, and is 268 * non-invasive...but some boards don't seem to reset and I don't have 269 * complete documentation on what the 'right' thing to do is...so we do 270 * the invasive thing for now. Yuck.] 271 */ 272 bus_space_write_1(asict, asich, NE2000_ASIC_RESET, tmp); 273 delay(5000); 274 275 /* 276 * This is needed because some NE clones apparently don't reset the 277 * NIC properly (or the NIC chip doesn't reset fully on power-up). 278 * XXX - this makes the probe invasive! Done against my better 279 * judgement. -DLG 280 */ 281 bus_space_write_1(nict, nich, ED_P0_CR, 282 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STP); 283 284 delay(5000); 285 286 /* 287 * Generic probe routine for testing for the existance of a DS8390. 288 * Must be performed after the NIC has just been reset. This 289 * works by looking at certain register values that are guaranteed 290 * to be initialized a certain way after power-up or reset. 291 * 292 * Specifically: 293 * 294 * Register reset bits set bits 295 * -------- ---------- -------- 296 * CR TXP, STA RD2, STP 297 * ISR RST 298 * IMR <all> 299 * DCR LAS 300 * TCR LB1, LB0 301 * 302 * We only look at CR and ISR, however, since looking at the others 303 * would require changing register pages, which would be intrusive 304 * if this isn't an 8390. 305 */ 306 307 tmp = bus_space_read_1(nict, nich, ED_P0_CR); 308 if ((tmp & (ED_CR_RD2 | ED_CR_TXP | ED_CR_STA | ED_CR_STP)) != 309 (ED_CR_RD2 | ED_CR_STP)) 310 goto out; 311 312 tmp = bus_space_read_1(nict, nich, ED_P0_ISR); 313 if ((tmp & ED_ISR_RST) != ED_ISR_RST) 314 goto out; 315 316 bus_space_write_1(nict, nich, 317 ED_P0_CR, ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 318 319 for (i = 0; i < 100; i++) { 320 if ((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RST) == 321 ED_ISR_RST) { 322 /* Ack the reset bit. */ 323 bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RST); 324 break; 325 } 326 delay(100); 327 } 328 329 #if 0 330 /* XXX */ 331 if (i == 100) 332 goto out; 333 #endif 334 335 /* 336 * Test the ability to read and write to the NIC memory. This has 337 * the side effect of determining if this is an NE1000 or an NE2000. 338 */ 339 340 /* 341 * This prevents packets from being stored in the NIC memory when 342 * the readmem routine turns on the start bit in the CR. 343 */ 344 bus_space_write_1(nict, nich, ED_P0_RCR, ED_RCR_MON); 345 346 /* Temporarily initialize DCR for byte operations. */ 347 bus_space_write_1(nict, nich, ED_P0_DCR, ED_DCR_FT1 | ED_DCR_LS); 348 349 bus_space_write_1(nict, nich, ED_P0_PSTART, 8192 >> ED_PAGE_SHIFT); 350 bus_space_write_1(nict, nich, ED_P0_PSTOP, 16384 >> ED_PAGE_SHIFT); 351 352 /* 353 * Write a test pattern in byte mode. If this fails, then there 354 * probably isn't any memory at 8k - which likely means that the 355 * board is an NE2000. 356 */ 357 ne2000_writemem(nict, nich, asict, asich, test_pattern, 8192, 358 sizeof(test_pattern), 0); 359 ne2000_readmem(nict, nich, asict, asich, 8192, test_buffer, 360 sizeof(test_buffer), 0); 361 362 if (bcmp(test_pattern, test_buffer, sizeof(test_pattern))) { 363 /* not an NE1000 - try NE2000 */ 364 bus_space_write_1(nict, nich, ED_P0_DCR, 365 ED_DCR_WTS | ED_DCR_FT1 | ED_DCR_LS); 366 bus_space_write_1(nict, nich, ED_P0_PSTART, 367 16384 >> ED_PAGE_SHIFT); 368 bus_space_write_1(nict, nich, ED_P0_PSTOP, 369 32768 >> ED_PAGE_SHIFT); 370 371 /* 372 * Write the test pattern in word mode. If this also fails, 373 * then we don't know what this board is. 374 */ 375 ne2000_writemem(nict, nich, asict, asich, test_pattern, 16384, 376 sizeof(test_pattern), 1); 377 ne2000_readmem(nict, nich, asict, asich, 16384, test_buffer, 378 sizeof(test_buffer), 1); 379 380 if (bcmp(test_pattern, test_buffer, sizeof(test_pattern))) 381 goto out; /* not an NE2000 either */ 382 383 rv = NE2000_TYPE_NE2000; 384 } else { 385 /* We're an NE1000. */ 386 rv = NE2000_TYPE_NE1000; 387 } 388 389 /* Clear any pending interrupts that might have occurred above. */ 390 bus_space_write_1(nict, nich, ED_P0_ISR, 0xff); 391 392 out: 393 return (rv); 394 } 395 396 /* 397 * Write an mbuf chain to the destination NIC memory address using programmed 398 * I/O. 399 */ 400 int 401 ne2000_write_mbuf(sc, m, buf) 402 struct dp8390_softc *sc; 403 struct mbuf *m; 404 int buf; 405 { 406 struct ne2000_softc *nsc = (struct ne2000_softc *)sc; 407 bus_space_tag_t nict = sc->sc_regt; 408 bus_space_handle_t nich = sc->sc_regh; 409 bus_space_tag_t asict = nsc->sc_asict; 410 bus_space_handle_t asich = nsc->sc_asich; 411 int savelen; 412 int maxwait = 100; /* about 120us */ 413 414 savelen = m->m_pkthdr.len; 415 416 /* Select page 0 registers. */ 417 bus_space_write_1(nict, nich, ED_P0_CR, 418 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 419 420 /* Reset remote DMA complete flag. */ 421 bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RDC); 422 423 /* Set up DMA byte count. */ 424 bus_space_write_1(nict, nich, ED_P0_RBCR0, savelen); 425 bus_space_write_1(nict, nich, ED_P0_RBCR1, savelen >> 8); 426 427 /* Set up destination address in NIC mem. */ 428 bus_space_write_1(nict, nich, ED_P0_RSAR0, buf); 429 bus_space_write_1(nict, nich, ED_P0_RSAR1, buf >> 8); 430 431 /* Set remote DMA write. */ 432 bus_space_write_1(nict, nich, 433 ED_P0_CR, ED_CR_RD1 | ED_CR_PAGE_0 | ED_CR_STA); 434 435 /* 436 * Transfer the mbuf chain to the NIC memory. NE2000 cards 437 * require that data be transferred as words, and only words, 438 * so that case requires some extra code to patch over odd-length 439 * mbufs. 440 */ 441 if (nsc->sc_type == NE2000_TYPE_NE1000) { 442 /* NE1000s are easy. */ 443 for (; m != 0; m = m->m_next) { 444 if (m->m_len) { 445 bus_space_write_multi_1(asict, asich, 446 NE2000_ASIC_DATA, mtod(m, u_int8_t *), 447 m->m_len); 448 } 449 } 450 } else { 451 /* NE2000s are a bit trickier. */ 452 u_int8_t *data, savebyte[2]; 453 int l, wantbyte; 454 455 wantbyte = 0; 456 for (; m != 0; m = m->m_next) { 457 l = m->m_len; 458 if (l == 0) 459 continue; 460 data = mtod(m, u_int8_t *); 461 /* Finish the last word. */ 462 if (wantbyte) { 463 savebyte[1] = *data; 464 bus_space_write_2(asict, asich, 465 NE2000_ASIC_DATA, *(u_int16_t *)savebyte); 466 data++; 467 l--; 468 wantbyte = 0; 469 } 470 /* Output contiguous words. */ 471 if (l > 1) { 472 bus_space_write_multi_2(asict, asich, 473 NE2000_ASIC_DATA, (u_int16_t *)data, 474 l >> 1); 475 } 476 /* Save last byte, if necessary. */ 477 if (l & 1) { 478 data += l & ~1; 479 savebyte[0] = *data; 480 wantbyte = 1; 481 } 482 } 483 484 if (wantbyte) { 485 savebyte[1] = 0; 486 bus_space_write_2(asict, asich, NE2000_ASIC_DATA, 487 *(u_int16_t *)savebyte); 488 } 489 } 490 491 /* 492 * Wait for remote DMA to complete. This is necessary because on the 493 * transmit side, data is handled internally by the NIC in bursts, and 494 * we can't start another remote DMA until this one completes. Not 495 * waiting causes really bad things to happen - like the NIC wedging 496 * the bus. 497 */ 498 while (((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RDC) != 499 ED_ISR_RDC) && --maxwait); 500 501 if (maxwait == 0) { 502 log(LOG_WARNING, 503 "%s: remote transmit DMA failed to complete\n", 504 sc->sc_dev.dv_xname); 505 dp8390_reset(sc); 506 } 507 508 return (savelen); 509 } 510 511 /* 512 * Given a source and destination address, copy 'amout' of a packet from 513 * the ring buffer into a linear destination buffer. Takes into account 514 * ring-wrap. 515 */ 516 int 517 ne2000_ring_copy(sc, src, dst, amount) 518 struct dp8390_softc *sc; 519 int src; 520 caddr_t dst; 521 u_short amount; 522 { 523 struct ne2000_softc *nsc = (struct ne2000_softc *)sc; 524 bus_space_tag_t nict = sc->sc_regt; 525 bus_space_handle_t nich = sc->sc_regh; 526 bus_space_tag_t asict = nsc->sc_asict; 527 bus_space_handle_t asich = nsc->sc_asich; 528 u_short tmp_amount; 529 int useword = (nsc->sc_type == NE2000_TYPE_NE2000); 530 531 /* Does copy wrap to lower addr in ring buffer? */ 532 if (src + amount > sc->mem_end) { 533 tmp_amount = sc->mem_end - src; 534 535 /* Copy amount up to end of NIC memory. */ 536 ne2000_readmem(nict, nich, asict, asich, src, 537 (u_int8_t *)dst, tmp_amount, useword); 538 539 amount -= tmp_amount; 540 src = sc->mem_ring; 541 dst += tmp_amount; 542 } 543 544 ne2000_readmem(nict, nich, asict, asich, src, (u_int8_t *)dst, 545 amount, useword); 546 547 return (src + amount); 548 } 549 550 void 551 ne2000_read_hdr(sc, buf, hdr) 552 struct dp8390_softc *sc; 553 int buf; 554 struct dp8390_ring *hdr; 555 { 556 struct ne2000_softc *nsc = (struct ne2000_softc *)sc; 557 558 ne2000_readmem(sc->sc_regt, sc->sc_regh, nsc->sc_asict, nsc->sc_asich, 559 buf, (u_int8_t *)hdr, sizeof(struct dp8390_ring), 560 (nsc->sc_type == NE2000_TYPE_NE2000)); 561 #if BYTE_ORDER == BIG_ENDIAN 562 hdr->count = bswap16(hdr->count); 563 #endif 564 } 565 566 int 567 ne2000_test_mem(sc) 568 struct dp8390_softc *sc; 569 { 570 571 /* Noop. */ 572 return (0); 573 } 574 575 /* 576 * Given a NIC memory source address and a host memory destination address, 577 * copy 'amount' from NIC to host using programmed i/o. The 'amount' is 578 * rounded up to a word - ok as long as mbufs are word sized. 579 */ 580 void 581 ne2000_readmem(nict, nich, asict, asich, src, dst, amount, useword) 582 bus_space_tag_t nict; 583 bus_space_handle_t nich; 584 bus_space_tag_t asict; 585 bus_space_handle_t asich; 586 int src; 587 u_int8_t *dst; 588 size_t amount; 589 int useword; 590 { 591 592 /* Select page 0 registers. */ 593 bus_space_write_1(nict, nich, ED_P0_CR, 594 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 595 596 /* Round up to a word. */ 597 if (amount & 1) 598 ++amount; 599 600 /* Set up DMA byte count. */ 601 bus_space_write_1(nict, nich, ED_P0_RBCR0, amount); 602 bus_space_write_1(nict, nich, ED_P0_RBCR1, amount >> 8); 603 604 /* Set up source address in NIC mem. */ 605 bus_space_write_1(nict, nich, ED_P0_RSAR0, src); 606 bus_space_write_1(nict, nich, ED_P0_RSAR1, src >> 8); 607 608 bus_space_write_1(nict, nich, ED_P0_CR, 609 ED_CR_RD0 | ED_CR_PAGE_0 | ED_CR_STA); 610 611 if (useword) 612 bus_space_read_multi_2(asict, asich, NE2000_ASIC_DATA, 613 (u_int16_t *)dst, amount >> 1); 614 else 615 bus_space_read_multi_1(asict, asich, NE2000_ASIC_DATA, 616 dst, amount); 617 } 618 619 /* 620 * Stripped down routine for writing a linear buffer to NIC memory. Only 621 * used in the probe routine to test the memory. 'len' must be even. 622 */ 623 void 624 ne2000_writemem(nict, nich, asict, asich, src, dst, len, useword) 625 bus_space_tag_t nict; 626 bus_space_handle_t nich; 627 bus_space_tag_t asict; 628 bus_space_handle_t asich; 629 u_int8_t *src; 630 int dst; 631 size_t len; 632 int useword; 633 { 634 int maxwait = 100; /* about 120us */ 635 636 /* Select page 0 registers. */ 637 bus_space_write_1(nict, nich, ED_P0_CR, 638 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 639 640 /* Reset remote DMA complete flag. */ 641 bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RDC); 642 643 /* Set up DMA byte count. */ 644 bus_space_write_1(nict, nich, ED_P0_RBCR0, len); 645 bus_space_write_1(nict, nich, ED_P0_RBCR1, len >> 8); 646 647 /* Set up destination address in NIC mem. */ 648 bus_space_write_1(nict, nich, ED_P0_RSAR0, dst); 649 bus_space_write_1(nict, nich, ED_P0_RSAR1, dst >> 8); 650 651 /* Set remote DMA write. */ 652 bus_space_write_1(nict, nich, ED_P0_CR, 653 ED_CR_RD1 | ED_CR_PAGE_0 | ED_CR_STA); 654 655 if (useword) 656 bus_space_write_multi_2(asict, asich, NE2000_ASIC_DATA, 657 (u_int16_t *)src, len >> 1); 658 else 659 bus_space_write_multi_1(asict, asich, NE2000_ASIC_DATA, 660 src, len); 661 662 /* 663 * Wait for remote DMA to complete. This is necessary because on the 664 * transmit side, data is handled internally by the NIC in bursts, and 665 * we can't start another remote DMA until this one completes. Not 666 * waiting causes really bad things to happen - like the NIC wedging 667 * the bus. 668 */ 669 while (((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RDC) != 670 ED_ISR_RDC) && --maxwait); 671 672 if (maxwait == 0) 673 printf("ne2000_writemem: failed to complete\n"); 674 } 675
Indexes created Mon Sep 22 21:09:42 GMT 2025