ne2000.c revision 1.15
1 /* $NetBSD: ne2000.c,v 1.15 1998/12/18 21:50:16 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 #ifndef __BUS_SPACE_HAS_STREAM_METHODS 74 #define bus_space_write_stream_2 bus_space_write_2 75 #define bus_space_write_multi_stream_2 bus_space_write_multi_2 76 #define bus_space_read_multi_stream_2 bus_space_read_multi_2 77 #endif /* __BUS_SPACE_HAS_STREAM_METHODS */ 78 79 #include <dev/ic/dp8390reg.h> 80 #include <dev/ic/dp8390var.h> 81 82 #include <dev/ic/ne2000reg.h> 83 #include <dev/ic/ne2000var.h> 84 85 int ne2000_write_mbuf __P((struct dp8390_softc *, struct mbuf *, int)); 86 int ne2000_ring_copy __P((struct dp8390_softc *, int, caddr_t, u_short)); 87 void ne2000_read_hdr __P((struct dp8390_softc *, int, struct dp8390_ring *)); 88 int ne2000_test_mem __P((struct dp8390_softc *)); 89 90 void ne2000_writemem __P((bus_space_tag_t, bus_space_handle_t, 91 bus_space_tag_t, bus_space_handle_t, u_int8_t *, int, size_t, 92 int, int)); 93 void ne2000_readmem __P((bus_space_tag_t, bus_space_handle_t, 94 bus_space_tag_t, bus_space_handle_t, int, u_int8_t *, size_t, int)); 95 96 void 97 ne2000_attach(nsc, myea, media, nmedia, defmedia) 98 struct ne2000_softc *nsc; 99 u_int8_t *myea; 100 int *media, nmedia, defmedia; 101 { 102 struct dp8390_softc *dsc = &nsc->sc_dp8390; 103 bus_space_tag_t nict = dsc->sc_regt; 104 bus_space_handle_t nich = dsc->sc_regh; 105 bus_space_tag_t asict = nsc->sc_asict; 106 bus_space_handle_t asich = nsc->sc_asich; 107 u_int8_t romdata[16]; 108 int memsize, i, useword; 109 110 /* 111 * Detect it again; this gives us the memory size. 112 */ 113 nsc->sc_type = ne2000_detect(nict, nich, asict, asich); 114 if (nsc->sc_type == 0) { 115 printf("%s: where did the card go?\n", dsc->sc_dev.dv_xname); 116 return; 117 } 118 119 useword = (nsc->sc_type == NE2000_TYPE_NE2000); 120 121 dsc->cr_proto = ED_CR_RD2; 122 123 /* 124 * DCR gets: 125 * 126 * FIFO threshold to 8, No auto-init Remote DMA, 127 * byte order=80x86. 128 * 129 * NE1000 gets byte-wide DMA, NE2000 gets word-wide DMA. 130 */ 131 dsc->dcr_reg = ED_DCR_FT1 | ED_DCR_LS | 132 (nsc->sc_type == NE2000_TYPE_NE2000 ? ED_DCR_WTS : 0); 133 134 dsc->test_mem = ne2000_test_mem; 135 dsc->ring_copy = ne2000_ring_copy; 136 dsc->write_mbuf = ne2000_write_mbuf; 137 dsc->read_hdr = ne2000_read_hdr; 138 139 /* Registers are linear. */ 140 for (i = 0; i < 16; i++) 141 dsc->sc_reg_map[i] = i; 142 143 /* 144 * 8k of memory plus an additional 8k if an NE2000. 145 */ 146 memsize = 8192 + (nsc->sc_type == NE2000_TYPE_NE2000 ? 8192 : 0); 147 148 /* 149 * NIC memory doens't start at zero on an NE board. 150 * The start address is tied to the bus width. 151 * (It happens to be computed the same way as mem size.) 152 */ 153 dsc->mem_start = memsize; 154 155 #ifdef GWETHER 156 { 157 int x, mstart = 0; 158 int8_t pbuf0[ED_PAGE_SIZE], pbuf[ED_PAGE_SIZE], 159 tbuf[ED_PAGE_SIZE]; 160 161 for (i = 0; i < ED_PAGE_SIZE; i++) 162 pbuf0[i] = 0; 163 164 /* Search for the start of RAM. */ 165 for (x = 1; x < 256; x++) { 166 ne2000_writemem(nict, nich, asict, asich, pbuf0, 167 x << ED_PAGE_SHIFT, ED_PAGE_SIZE, useword, 0); 168 ne2000_readmem(nict, nich, asict, asich, 169 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, useword); 170 if (bcmp(pbuf0, tbuf, ED_PAGE_SIZE) == 0) { 171 for (i = 0; i < ED_PAGE_SIZE; i++) 172 pbuf[i] = 255 - x; 173 ne2000_writemem(nict, nich, asict, asich, 174 pbuf, x << ED_PAGE_SHIFT, ED_PAGE_SIZE, 175 useword, 0); 176 ne2000_readmem(nict, nich, asict, asich, 177 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, 178 useword); 179 if (bcmp(pbuf, tbuf, ED_PAGE_SIZE) == 0) { 180 mstart = x << ED_PAGE_SHIFT; 181 memsize = ED_PAGE_SIZE; 182 break; 183 } 184 } 185 } 186 187 if (mstart == 0) { 188 printf("%s: cannot find start of RAM\n", 189 dsc->sc_dev.dv_xname); 190 return; 191 } 192 193 /* Search for the end of RAM. */ 194 for (++x; x < 256; x++) { 195 ne2000_writemem(nict, nich, asict, asich, pbuf0, 196 x << ED_PAGE_SHIFT, ED_PAGE_SIZE, useword, 0); 197 ne2000_readmem(nict, nich, asict, asich, 198 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, useword); 199 if (bcmp(pbuf0, tbuf, ED_PAGE_SIZE) == 0) { 200 for (i = 0; i < ED_PAGE_SIZE; i++) 201 pbuf[i] = 255 - x; 202 ne2000_writemem(nict, nich, asict, asich, 203 pbuf, x << ED_PAGE_SHIFT, ED_PAGE_SIZE, 204 useword, 0); 205 ne2000_readmem(nict, nich, asict, asich, 206 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, 207 useword); 208 if (bcmp(pbuf, tbuf, ED_PAGE_SIZE) == 0) 209 memsize += ED_PAGE_SIZE; 210 else 211 break; 212 } else 213 break; 214 } 215 216 printf("%s: RAM start 0x%x, size %d\n", 217 dsc->sc_dev.dv_xname, mstart, memsize); 218 219 dsc->mem_start = mstart; 220 } 221 #endif /* GWETHER */ 222 223 dsc->mem_size = memsize; 224 225 if (myea == NULL) { 226 /* Read the station address. */ 227 ne2000_readmem(nict, nich, asict, asich, 0, romdata, 228 sizeof(romdata), useword); 229 for (i = 0; i < ETHER_ADDR_LEN; i++) 230 dsc->sc_enaddr[i] = romdata[i * (useword ? 2 : 1)]; 231 } else 232 bcopy(myea, dsc->sc_enaddr, sizeof(dsc->sc_enaddr)); 233 234 /* Clear any pending interrupts that might have occurred above. */ 235 bus_space_write_1(nict, nich, ED_P0_ISR, 0xff); 236 237 if (dp8390_config(dsc, media, nmedia, defmedia)) { 238 printf("%s: setup failed\n", dsc->sc_dev.dv_xname); 239 return; 240 } 241 242 /* 243 * We need to compute mem_ring a bit differently; override the 244 * value set up in dp8390_config(). 245 */ 246 dsc->mem_ring = 247 dsc->mem_start + ((dsc->txb_cnt * ED_TXBUF_SIZE) << ED_PAGE_SHIFT); 248 } 249 250 /* 251 * Detect an NE-2000 or compatible. Returns a model code. 252 */ 253 int 254 ne2000_detect(nict, nich, asict, asich) 255 bus_space_tag_t nict; 256 bus_space_handle_t nich; 257 bus_space_tag_t asict; 258 bus_space_handle_t asich; 259 { 260 static u_int8_t test_pattern[32] = "THIS is A memory TEST pattern"; 261 u_int8_t test_buffer[32], tmp; 262 int i, rv = 0; 263 264 /* Reset the board. */ 265 #ifdef GWETHER 266 bus_space_write_1(asict, asich, NE2000_ASIC_RESET, 0); 267 delay(200); 268 #endif /* GWETHER */ 269 tmp = bus_space_read_1(asict, asich, NE2000_ASIC_RESET); 270 delay(10000); 271 272 /* 273 * I don't know if this is necessary; probably cruft leftover from 274 * Clarkson packet driver code. Doesn't do a thing on the boards I've 275 * tested. -DG [note that a outb(0x84, 0) seems to work here, and is 276 * non-invasive...but some boards don't seem to reset and I don't have 277 * complete documentation on what the 'right' thing to do is...so we do 278 * the invasive thing for now. Yuck.] 279 */ 280 bus_space_write_1(asict, asich, NE2000_ASIC_RESET, tmp); 281 delay(5000); 282 283 /* 284 * This is needed because some NE clones apparently don't reset the 285 * NIC properly (or the NIC chip doesn't reset fully on power-up). 286 * XXX - this makes the probe invasive! Done against my better 287 * judgement. -DLG 288 */ 289 bus_space_write_1(nict, nich, ED_P0_CR, 290 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STP); 291 292 delay(5000); 293 294 /* 295 * Generic probe routine for testing for the existance of a DS8390. 296 * Must be performed after the NIC has just been reset. This 297 * works by looking at certain register values that are guaranteed 298 * to be initialized a certain way after power-up or reset. 299 * 300 * Specifically: 301 * 302 * Register reset bits set bits 303 * -------- ---------- -------- 304 * CR TXP, STA RD2, STP 305 * ISR RST 306 * IMR <all> 307 * DCR LAS 308 * TCR LB1, LB0 309 * 310 * We only look at CR and ISR, however, since looking at the others 311 * would require changing register pages, which would be intrusive 312 * if this isn't an 8390. 313 */ 314 315 tmp = bus_space_read_1(nict, nich, ED_P0_CR); 316 if ((tmp & (ED_CR_RD2 | ED_CR_TXP | ED_CR_STA | ED_CR_STP)) != 317 (ED_CR_RD2 | ED_CR_STP)) 318 goto out; 319 320 tmp = bus_space_read_1(nict, nich, ED_P0_ISR); 321 if ((tmp & ED_ISR_RST) != ED_ISR_RST) 322 goto out; 323 324 bus_space_write_1(nict, nich, 325 ED_P0_CR, ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 326 327 for (i = 0; i < 100; i++) { 328 if ((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RST) == 329 ED_ISR_RST) { 330 /* Ack the reset bit. */ 331 bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RST); 332 break; 333 } 334 delay(100); 335 } 336 337 #if 0 338 /* XXX */ 339 if (i == 100) 340 goto out; 341 #endif 342 343 /* 344 * Test the ability to read and write to the NIC memory. This has 345 * the side effect of determining if this is an NE1000 or an NE2000. 346 */ 347 348 /* 349 * This prevents packets from being stored in the NIC memory when 350 * the readmem routine turns on the start bit in the CR. 351 */ 352 bus_space_write_1(nict, nich, ED_P0_RCR, ED_RCR_MON); 353 354 /* Temporarily initialize DCR for byte operations. */ 355 bus_space_write_1(nict, nich, ED_P0_DCR, ED_DCR_FT1 | ED_DCR_LS); 356 357 bus_space_write_1(nict, nich, ED_P0_PSTART, 8192 >> ED_PAGE_SHIFT); 358 bus_space_write_1(nict, nich, ED_P0_PSTOP, 16384 >> ED_PAGE_SHIFT); 359 360 /* 361 * Write a test pattern in byte mode. If this fails, then there 362 * probably isn't any memory at 8k - which likely means that the 363 * board is an NE2000. 364 */ 365 ne2000_writemem(nict, nich, asict, asich, test_pattern, 8192, 366 sizeof(test_pattern), 0, 1); 367 ne2000_readmem(nict, nich, asict, asich, 8192, test_buffer, 368 sizeof(test_buffer), 0); 369 370 if (bcmp(test_pattern, test_buffer, sizeof(test_pattern))) { 371 /* not an NE1000 - try NE2000 */ 372 bus_space_write_1(nict, nich, ED_P0_DCR, 373 ED_DCR_WTS | ED_DCR_FT1 | ED_DCR_LS); 374 bus_space_write_1(nict, nich, ED_P0_PSTART, 375 16384 >> ED_PAGE_SHIFT); 376 bus_space_write_1(nict, nich, ED_P0_PSTOP, 377 32768 >> ED_PAGE_SHIFT); 378 379 /* 380 * Write the test pattern in word mode. If this also fails, 381 * then we don't know what this board is. 382 */ 383 ne2000_writemem(nict, nich, asict, asich, test_pattern, 16384, 384 sizeof(test_pattern), 1, 0); 385 ne2000_readmem(nict, nich, asict, asich, 16384, test_buffer, 386 sizeof(test_buffer), 1); 387 388 if (bcmp(test_pattern, test_buffer, sizeof(test_pattern))) 389 goto out; /* not an NE2000 either */ 390 391 rv = NE2000_TYPE_NE2000; 392 } else { 393 /* We're an NE1000. */ 394 rv = NE2000_TYPE_NE1000; 395 } 396 397 /* Clear any pending interrupts that might have occurred above. */ 398 bus_space_write_1(nict, nich, ED_P0_ISR, 0xff); 399 400 out: 401 return (rv); 402 } 403 404 /* 405 * Write an mbuf chain to the destination NIC memory address using programmed 406 * I/O. 407 */ 408 int 409 ne2000_write_mbuf(sc, m, buf) 410 struct dp8390_softc *sc; 411 struct mbuf *m; 412 int buf; 413 { 414 struct ne2000_softc *nsc = (struct ne2000_softc *)sc; 415 bus_space_tag_t nict = sc->sc_regt; 416 bus_space_handle_t nich = sc->sc_regh; 417 bus_space_tag_t asict = nsc->sc_asict; 418 bus_space_handle_t asich = nsc->sc_asich; 419 int savelen; 420 int maxwait = 100; /* about 120us */ 421 422 savelen = m->m_pkthdr.len; 423 424 /* Select page 0 registers. */ 425 bus_space_write_1(nict, nich, ED_P0_CR, 426 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 427 428 /* Reset remote DMA complete flag. */ 429 bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RDC); 430 431 /* Set up DMA byte count. */ 432 bus_space_write_1(nict, nich, ED_P0_RBCR0, savelen); 433 bus_space_write_1(nict, nich, ED_P0_RBCR1, savelen >> 8); 434 435 /* Set up destination address in NIC mem. */ 436 bus_space_write_1(nict, nich, ED_P0_RSAR0, buf); 437 bus_space_write_1(nict, nich, ED_P0_RSAR1, buf >> 8); 438 439 /* Set remote DMA write. */ 440 bus_space_write_1(nict, nich, 441 ED_P0_CR, ED_CR_RD1 | ED_CR_PAGE_0 | ED_CR_STA); 442 443 /* 444 * Transfer the mbuf chain to the NIC memory. NE2000 cards 445 * require that data be transferred as words, and only words, 446 * so that case requires some extra code to patch over odd-length 447 * mbufs. 448 */ 449 if (nsc->sc_type == NE2000_TYPE_NE1000) { 450 /* NE1000s are easy. */ 451 for (; m != 0; m = m->m_next) { 452 if (m->m_len) { 453 bus_space_write_multi_1(asict, asich, 454 NE2000_ASIC_DATA, mtod(m, u_int8_t *), 455 m->m_len); 456 } 457 } 458 } else { 459 /* NE2000s are a bit trickier. */ 460 u_int8_t *data, savebyte[2]; 461 int l, leftover; 462 #ifdef DIAGNOSTIC 463 u_int8_t *lim; 464 #endif 465 /* Start out with no leftover data. */ 466 leftover = 0; 467 savebyte[0] = savebyte[1] = 0; 468 469 for (; m != 0; m = m->m_next) { 470 l = m->m_len; 471 if (l == 0) 472 continue; 473 data = mtod(m, u_int8_t *); 474 #ifdef DIAGNOSTIC 475 lim = data + l; 476 #endif 477 while (l > 0) { 478 if (leftover) { 479 /* 480 * Data left over (from mbuf or 481 * realignment). Buffer the next 482 * byte, and write it and the 483 * leftover data out. 484 */ 485 savebyte[1] = *data++; 486 l--; 487 bus_space_write_stream_2(asict, asich, 488 NE2000_ASIC_DATA, 489 *(u_int16_t *)savebyte); 490 leftover = 0; 491 } else if (ALIGNED_POINTER(data, 492 u_int16_t) == 0) { 493 /* 494 * Unaligned data; buffer the next 495 * byte. 496 */ 497 savebyte[0] = *data++; 498 l--; 499 leftover = 1; 500 } else { 501 /* 502 * Aligned data; output contiguous 503 * words as much as we can, then 504 * buffer the remaining byte, if any. 505 */ 506 leftover = l & 1; 507 l &= ~1; 508 bus_space_write_multi_stream_2(asict, 509 asich, NE2000_ASIC_DATA, 510 (u_int16_t *)data, l >> 1); 511 data += l; 512 if (leftover) 513 savebyte[0] = *data++; 514 l = 0; 515 } 516 } 517 if (l < 0) 518 panic("ne2000_write_mbuf: negative len"); 519 #ifdef DIAGNOSTIC 520 if (data != lim) 521 panic("ne2000_write_mbuf: data != lim"); 522 #endif 523 } 524 if (leftover) { 525 savebyte[1] = 0; 526 bus_space_write_stream_2(asict, asich, NE2000_ASIC_DATA, 527 *(u_int16_t *)savebyte); 528 } 529 } 530 531 /* 532 * Wait for remote DMA to complete. This is necessary because on the 533 * transmit side, data is handled internally by the NIC in bursts, and 534 * we can't start another remote DMA until this one completes. Not 535 * waiting causes really bad things to happen - like the NIC wedging 536 * the bus. 537 */ 538 while (((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RDC) != 539 ED_ISR_RDC) && --maxwait); 540 541 if (maxwait == 0) { 542 log(LOG_WARNING, 543 "%s: remote transmit DMA failed to complete\n", 544 sc->sc_dev.dv_xname); 545 dp8390_reset(sc); 546 } 547 548 return (savelen); 549 } 550 551 /* 552 * Given a source and destination address, copy 'amout' of a packet from 553 * the ring buffer into a linear destination buffer. Takes into account 554 * ring-wrap. 555 */ 556 int 557 ne2000_ring_copy(sc, src, dst, amount) 558 struct dp8390_softc *sc; 559 int src; 560 caddr_t dst; 561 u_short amount; 562 { 563 struct ne2000_softc *nsc = (struct ne2000_softc *)sc; 564 bus_space_tag_t nict = sc->sc_regt; 565 bus_space_handle_t nich = sc->sc_regh; 566 bus_space_tag_t asict = nsc->sc_asict; 567 bus_space_handle_t asich = nsc->sc_asich; 568 u_short tmp_amount; 569 int useword = (nsc->sc_type == NE2000_TYPE_NE2000); 570 571 /* Does copy wrap to lower addr in ring buffer? */ 572 if (src + amount > sc->mem_end) { 573 tmp_amount = sc->mem_end - src; 574 575 /* Copy amount up to end of NIC memory. */ 576 ne2000_readmem(nict, nich, asict, asich, src, 577 (u_int8_t *)dst, tmp_amount, useword); 578 579 amount -= tmp_amount; 580 src = sc->mem_ring; 581 dst += tmp_amount; 582 } 583 584 ne2000_readmem(nict, nich, asict, asich, src, (u_int8_t *)dst, 585 amount, useword); 586 587 return (src + amount); 588 } 589 590 void 591 ne2000_read_hdr(sc, buf, hdr) 592 struct dp8390_softc *sc; 593 int buf; 594 struct dp8390_ring *hdr; 595 { 596 struct ne2000_softc *nsc = (struct ne2000_softc *)sc; 597 598 ne2000_readmem(sc->sc_regt, sc->sc_regh, nsc->sc_asict, nsc->sc_asich, 599 buf, (u_int8_t *)hdr, sizeof(struct dp8390_ring), 600 (nsc->sc_type == NE2000_TYPE_NE2000)); 601 #if BYTE_ORDER == BIG_ENDIAN 602 hdr->count = bswap16(hdr->count); 603 #endif 604 } 605 606 int 607 ne2000_test_mem(sc) 608 struct dp8390_softc *sc; 609 { 610 611 /* Noop. */ 612 return (0); 613 } 614 615 /* 616 * Given a NIC memory source address and a host memory destination address, 617 * copy 'amount' from NIC to host using programmed i/o. The 'amount' is 618 * rounded up to a word - ok as long as mbufs are word sized. 619 */ 620 void 621 ne2000_readmem(nict, nich, asict, asich, src, dst, amount, useword) 622 bus_space_tag_t nict; 623 bus_space_handle_t nich; 624 bus_space_tag_t asict; 625 bus_space_handle_t asich; 626 int src; 627 u_int8_t *dst; 628 size_t amount; 629 int useword; 630 { 631 632 /* Select page 0 registers. */ 633 bus_space_write_1(nict, nich, ED_P0_CR, 634 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 635 636 /* Round up to a word. */ 637 if (amount & 1) 638 ++amount; 639 640 /* Set up DMA byte count. */ 641 bus_space_write_1(nict, nich, ED_P0_RBCR0, amount); 642 bus_space_write_1(nict, nich, ED_P0_RBCR1, amount >> 8); 643 644 /* Set up source address in NIC mem. */ 645 bus_space_write_1(nict, nich, ED_P0_RSAR0, src); 646 bus_space_write_1(nict, nich, ED_P0_RSAR1, src >> 8); 647 648 bus_space_write_1(nict, nich, ED_P0_CR, 649 ED_CR_RD0 | ED_CR_PAGE_0 | ED_CR_STA); 650 651 if (useword) 652 bus_space_read_multi_stream_2(asict, asich, NE2000_ASIC_DATA, 653 (u_int16_t *)dst, amount >> 1); 654 else 655 bus_space_read_multi_1(asict, asich, NE2000_ASIC_DATA, 656 dst, amount); 657 } 658 659 /* 660 * Stripped down routine for writing a linear buffer to NIC memory. Only 661 * used in the probe routine to test the memory. 'len' must be even. 662 */ 663 void 664 ne2000_writemem(nict, nich, asict, asich, src, dst, len, useword, quiet) 665 bus_space_tag_t nict; 666 bus_space_handle_t nich; 667 bus_space_tag_t asict; 668 bus_space_handle_t asich; 669 u_int8_t *src; 670 int dst; 671 size_t len; 672 int useword; 673 int quiet; 674 { 675 int maxwait = 100; /* about 120us */ 676 677 /* Select page 0 registers. */ 678 bus_space_write_1(nict, nich, ED_P0_CR, 679 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 680 681 /* Reset remote DMA complete flag. */ 682 bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RDC); 683 684 /* Set up DMA byte count. */ 685 bus_space_write_1(nict, nich, ED_P0_RBCR0, len); 686 bus_space_write_1(nict, nich, ED_P0_RBCR1, len >> 8); 687 688 /* Set up destination address in NIC mem. */ 689 bus_space_write_1(nict, nich, ED_P0_RSAR0, dst); 690 bus_space_write_1(nict, nich, ED_P0_RSAR1, dst >> 8); 691 692 /* Set remote DMA write. */ 693 bus_space_write_1(nict, nich, ED_P0_CR, 694 ED_CR_RD1 | ED_CR_PAGE_0 | ED_CR_STA); 695 696 if (useword) 697 bus_space_write_multi_stream_2(asict, asich, NE2000_ASIC_DATA, 698 (u_int16_t *)src, len >> 1); 699 else 700 bus_space_write_multi_1(asict, asich, NE2000_ASIC_DATA, 701 src, len); 702 703 /* 704 * Wait for remote DMA to complete. This is necessary because on the 705 * transmit side, data is handled internally by the NIC in bursts, and 706 * we can't start another remote DMA until this one completes. Not 707 * waiting causes really bad things to happen - like the NIC wedging 708 * the bus. 709 */ 710 while (((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RDC) != 711 ED_ISR_RDC) && --maxwait); 712 713 if (!quiet && maxwait == 0) 714 printf("ne2000_writemem: failed to complete\n"); 715 } 716
Indexes created Wed Sep 24 14:09:57 GMT 2025