ne2000.c revision 1.14.4.1
1 /* $NetBSD: ne2000.c,v 1.14.4.1 1998/12/11 04:53:00 kenh 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, int)); 92 void ne2000_readmem __P((bus_space_tag_t, bus_space_handle_t, 93 bus_space_tag_t, bus_space_handle_t, int, u_int8_t *, size_t, int)); 94 95 void 96 ne2000_attach(nsc, myea, media, nmedia, defmedia) 97 struct ne2000_softc *nsc; 98 u_int8_t *myea; 99 int *media, nmedia, defmedia; 100 { 101 struct dp8390_softc *dsc = &nsc->sc_dp8390; 102 bus_space_tag_t nict = dsc->sc_regt; 103 bus_space_handle_t nich = dsc->sc_regh; 104 bus_space_tag_t asict = nsc->sc_asict; 105 bus_space_handle_t asich = nsc->sc_asich; 106 u_int8_t romdata[16]; 107 int memsize, i, useword; 108 109 /* 110 * Detect it again; this gives us the memory size. 111 */ 112 nsc->sc_type = ne2000_detect(nict, nich, asict, asich); 113 if (nsc->sc_type == 0) { 114 printf("%s: where did the card go?\n", dsc->sc_dev.dv_xname); 115 return; 116 } 117 118 useword = (nsc->sc_type == NE2000_TYPE_NE2000); 119 120 dsc->cr_proto = ED_CR_RD2; 121 122 /* 123 * DCR gets: 124 * 125 * FIFO threshold to 8, No auto-init Remote DMA, 126 * byte order=80x86. 127 * 128 * NE1000 gets byte-wide DMA, NE2000 gets word-wide DMA. 129 */ 130 dsc->dcr_reg = ED_DCR_FT1 | ED_DCR_LS | 131 (nsc->sc_type == NE2000_TYPE_NE2000 ? ED_DCR_WTS : 0); 132 133 dsc->test_mem = ne2000_test_mem; 134 dsc->ring_copy = ne2000_ring_copy; 135 dsc->write_mbuf = ne2000_write_mbuf; 136 dsc->read_hdr = ne2000_read_hdr; 137 138 /* Registers are linear. */ 139 for (i = 0; i < 16; i++) 140 dsc->sc_reg_map[i] = i; 141 142 /* 143 * 8k of memory plus an additional 8k if an NE2000. 144 */ 145 memsize = 8192 + (nsc->sc_type == NE2000_TYPE_NE2000 ? 8192 : 0); 146 147 /* 148 * NIC memory doens't start at zero on an NE board. 149 * The start address is tied to the bus width. 150 * (It happens to be computed the same way as mem size.) 151 */ 152 dsc->mem_start = memsize; 153 154 #ifdef GWETHER 155 { 156 int x, mstart = 0; 157 int8_t pbuf0[ED_PAGE_SIZE], pbuf[ED_PAGE_SIZE], 158 tbuf[ED_PAGE_SIZE]; 159 160 for (i = 0; i < ED_PAGE_SIZE; i++) 161 pbuf0[i] = 0; 162 163 /* Search for the start of RAM. */ 164 for (x = 1; x < 256; x++) { 165 ne2000_writemem(nict, nich, asict, asich, pbuf0, 166 x << ED_PAGE_SHIFT, ED_PAGE_SIZE, useword); 167 ne2000_readmem(nict, nich, asict, asich, 168 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, useword); 169 if (bcmp(pbuf0, tbuf, ED_PAGE_SIZE) == 0) { 170 for (i = 0; i < ED_PAGE_SIZE; i++) 171 pbuf[i] = 255 - x; 172 ne2000_writemem(nict, nich, asict, asich, 173 pbuf, x << ED_PAGE_SHIFT, ED_PAGE_SIZE, 174 useword); 175 ne2000_readmem(nict, nich, asict, asich, 176 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, 177 useword); 178 if (bcmp(pbuf, tbuf, ED_PAGE_SIZE) == 0) { 179 mstart = x << ED_PAGE_SHIFT; 180 memsize = ED_PAGE_SIZE; 181 break; 182 } 183 } 184 } 185 186 if (mstart == 0) { 187 printf("%s: cannot find start of RAM\n", 188 dsc->sc_dev.dv_xname); 189 return; 190 } 191 192 /* Search for the end of RAM. */ 193 for (++x; x < 256; x++) { 194 ne2000_writemem(nict, nich, asict, asich, pbuf0, 195 x << ED_PAGE_SHIFT, ED_PAGE_SIZE, useword); 196 ne2000_readmem(nict, nich, asict, asich, 197 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, useword); 198 if (bcmp(pbuf0, tbuf, ED_PAGE_SIZE) == 0) { 199 for (i = 0; i < ED_PAGE_SIZE; i++) 200 pbuf[i] = 255 - x; 201 ne2000_writemem(nict, nich, asict, asich, 202 pbuf, x << ED_PAGE_SHIFT, ED_PAGE_SIZE, 203 useword); 204 ne2000_readmem(nict, nich, asict, asich, 205 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, 206 useword); 207 if (bcmp(pbuf, tbuf, ED_PAGE_SIZE) == 0) 208 memsize += ED_PAGE_SIZE; 209 else 210 break; 211 } else 212 break; 213 } 214 215 printf("%s: RAM start 0x%x, size %d\n", 216 dsc->sc_dev.dv_xname, mstart, memsize); 217 218 dsc->mem_start = mstart; 219 } 220 #endif /* GWETHER */ 221 222 dsc->mem_size = memsize; 223 224 if (myea == NULL) { 225 /* Read the station address. */ 226 ne2000_readmem(nict, nich, asict, asich, 0, romdata, 227 sizeof(romdata), useword); 228 for (i = 0; i < ETHER_ADDR_LEN; i++) 229 dsc->sc_enaddr[i] = romdata[i * (useword ? 2 : 1)]; 230 } else 231 bcopy(myea, dsc->sc_enaddr, sizeof(dsc->sc_enaddr)); 232 233 /* Clear any pending interrupts that might have occurred above. */ 234 bus_space_write_1(nict, nich, ED_P0_ISR, 0xff); 235 236 if (dp8390_config(dsc, media, nmedia, defmedia, NULL)) { 237 printf("%s: setup failed\n", dsc->sc_dev.dv_xname); 238 return; 239 } 240 241 /* 242 * We need to compute mem_ring a bit differently; override the 243 * value set up in dp8390_config(). 244 */ 245 dsc->mem_ring = 246 dsc->mem_start + ((dsc->txb_cnt * ED_TXBUF_SIZE) << ED_PAGE_SHIFT); 247 } 248 249 /* 250 * Detect an NE-2000 or compatible. Returns a model code. 251 */ 252 int 253 ne2000_detect(nict, nich, asict, asich) 254 bus_space_tag_t nict; 255 bus_space_handle_t nich; 256 bus_space_tag_t asict; 257 bus_space_handle_t asich; 258 { 259 static u_int8_t test_pattern[32] = "THIS is A memory TEST pattern"; 260 u_int8_t test_buffer[32], tmp; 261 int i, rv = 0; 262 263 /* Reset the board. */ 264 #ifdef GWETHER 265 bus_space_write_1(asict, asich, NE2000_ASIC_RESET, 0); 266 delay(200); 267 #endif /* GWETHER */ 268 tmp = bus_space_read_1(asict, asich, NE2000_ASIC_RESET); 269 delay(10000); 270 271 /* 272 * I don't know if this is necessary; probably cruft leftover from 273 * Clarkson packet driver code. Doesn't do a thing on the boards I've 274 * tested. -DG [note that a outb(0x84, 0) seems to work here, and is 275 * non-invasive...but some boards don't seem to reset and I don't have 276 * complete documentation on what the 'right' thing to do is...so we do 277 * the invasive thing for now. Yuck.] 278 */ 279 bus_space_write_1(asict, asich, NE2000_ASIC_RESET, tmp); 280 delay(5000); 281 282 /* 283 * This is needed because some NE clones apparently don't reset the 284 * NIC properly (or the NIC chip doesn't reset fully on power-up). 285 * XXX - this makes the probe invasive! Done against my better 286 * judgement. -DLG 287 */ 288 bus_space_write_1(nict, nich, ED_P0_CR, 289 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STP); 290 291 delay(5000); 292 293 /* 294 * Generic probe routine for testing for the existance of a DS8390. 295 * Must be performed after the NIC has just been reset. This 296 * works by looking at certain register values that are guaranteed 297 * to be initialized a certain way after power-up or reset. 298 * 299 * Specifically: 300 * 301 * Register reset bits set bits 302 * -------- ---------- -------- 303 * CR TXP, STA RD2, STP 304 * ISR RST 305 * IMR <all> 306 * DCR LAS 307 * TCR LB1, LB0 308 * 309 * We only look at CR and ISR, however, since looking at the others 310 * would require changing register pages, which would be intrusive 311 * if this isn't an 8390. 312 */ 313 314 tmp = bus_space_read_1(nict, nich, ED_P0_CR); 315 if ((tmp & (ED_CR_RD2 | ED_CR_TXP | ED_CR_STA | ED_CR_STP)) != 316 (ED_CR_RD2 | ED_CR_STP)) 317 goto out; 318 319 tmp = bus_space_read_1(nict, nich, ED_P0_ISR); 320 if ((tmp & ED_ISR_RST) != ED_ISR_RST) 321 goto out; 322 323 bus_space_write_1(nict, nich, 324 ED_P0_CR, ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 325 326 for (i = 0; i < 100; i++) { 327 if ((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RST) == 328 ED_ISR_RST) { 329 /* Ack the reset bit. */ 330 bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RST); 331 break; 332 } 333 delay(100); 334 } 335 336 #if 0 337 /* XXX */ 338 if (i == 100) 339 goto out; 340 #endif 341 342 /* 343 * Test the ability to read and write to the NIC memory. This has 344 * the side effect of determining if this is an NE1000 or an NE2000. 345 */ 346 347 /* 348 * This prevents packets from being stored in the NIC memory when 349 * the readmem routine turns on the start bit in the CR. 350 */ 351 bus_space_write_1(nict, nich, ED_P0_RCR, ED_RCR_MON); 352 353 /* Temporarily initialize DCR for byte operations. */ 354 bus_space_write_1(nict, nich, ED_P0_DCR, ED_DCR_FT1 | ED_DCR_LS); 355 356 bus_space_write_1(nict, nich, ED_P0_PSTART, 8192 >> ED_PAGE_SHIFT); 357 bus_space_write_1(nict, nich, ED_P0_PSTOP, 16384 >> ED_PAGE_SHIFT); 358 359 /* 360 * Write a test pattern in byte mode. If this fails, then there 361 * probably isn't any memory at 8k - which likely means that the 362 * board is an NE2000. 363 */ 364 ne2000_writemem(nict, nich, asict, asich, test_pattern, 8192, 365 sizeof(test_pattern), 0); 366 ne2000_readmem(nict, nich, asict, asich, 8192, test_buffer, 367 sizeof(test_buffer), 0); 368 369 if (bcmp(test_pattern, test_buffer, sizeof(test_pattern))) { 370 /* not an NE1000 - try NE2000 */ 371 bus_space_write_1(nict, nich, ED_P0_DCR, 372 ED_DCR_WTS | ED_DCR_FT1 | ED_DCR_LS); 373 bus_space_write_1(nict, nich, ED_P0_PSTART, 374 16384 >> ED_PAGE_SHIFT); 375 bus_space_write_1(nict, nich, ED_P0_PSTOP, 376 32768 >> ED_PAGE_SHIFT); 377 378 /* 379 * Write the test pattern in word mode. If this also fails, 380 * then we don't know what this board is. 381 */ 382 ne2000_writemem(nict, nich, asict, asich, test_pattern, 16384, 383 sizeof(test_pattern), 1); 384 ne2000_readmem(nict, nich, asict, asich, 16384, test_buffer, 385 sizeof(test_buffer), 1); 386 387 if (bcmp(test_pattern, test_buffer, sizeof(test_pattern))) 388 goto out; /* not an NE2000 either */ 389 390 rv = NE2000_TYPE_NE2000; 391 } else { 392 /* We're an NE1000. */ 393 rv = NE2000_TYPE_NE1000; 394 } 395 396 /* Clear any pending interrupts that might have occurred above. */ 397 bus_space_write_1(nict, nich, ED_P0_ISR, 0xff); 398 399 out: 400 return (rv); 401 } 402 403 /* 404 * Write an mbuf chain to the destination NIC memory address using programmed 405 * I/O. 406 */ 407 int 408 ne2000_write_mbuf(sc, m, buf) 409 struct dp8390_softc *sc; 410 struct mbuf *m; 411 int buf; 412 { 413 struct ne2000_softc *nsc = (struct ne2000_softc *)sc; 414 bus_space_tag_t nict = sc->sc_regt; 415 bus_space_handle_t nich = sc->sc_regh; 416 bus_space_tag_t asict = nsc->sc_asict; 417 bus_space_handle_t asich = nsc->sc_asich; 418 int savelen; 419 int maxwait = 100; /* about 120us */ 420 421 savelen = m->m_pkthdr.len; 422 423 /* Select page 0 registers. */ 424 bus_space_write_1(nict, nich, ED_P0_CR, 425 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 426 427 /* Reset remote DMA complete flag. */ 428 bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RDC); 429 430 /* Set up DMA byte count. */ 431 bus_space_write_1(nict, nich, ED_P0_RBCR0, savelen); 432 bus_space_write_1(nict, nich, ED_P0_RBCR1, savelen >> 8); 433 434 /* Set up destination address in NIC mem. */ 435 bus_space_write_1(nict, nich, ED_P0_RSAR0, buf); 436 bus_space_write_1(nict, nich, ED_P0_RSAR1, buf >> 8); 437 438 /* Set remote DMA write. */ 439 bus_space_write_1(nict, nich, 440 ED_P0_CR, ED_CR_RD1 | ED_CR_PAGE_0 | ED_CR_STA); 441 442 /* 443 * Transfer the mbuf chain to the NIC memory. NE2000 cards 444 * require that data be transferred as words, and only words, 445 * so that case requires some extra code to patch over odd-length 446 * mbufs. 447 */ 448 if (nsc->sc_type == NE2000_TYPE_NE1000) { 449 /* NE1000s are easy. */ 450 for (; m != 0; m = m->m_next) { 451 if (m->m_len) { 452 bus_space_write_multi_1(asict, asich, 453 NE2000_ASIC_DATA, mtod(m, u_int8_t *), 454 m->m_len); 455 } 456 } 457 } else { 458 /* NE2000s are a bit trickier. */ 459 u_int8_t *data, savebyte[2]; 460 int l, leftover; 461 #ifdef DIAGNOSTIC 462 u_int8_t *lim; 463 #endif 464 /* Start out with no leftover data. */ 465 leftover = 0; 466 savebyte[0] = savebyte[1] = 0; 467 468 for (; m != 0; m = m->m_next) { 469 l = m->m_len; 470 if (l == 0) 471 continue; 472 data = mtod(m, u_int8_t *); 473 #ifdef DIAGNOSTIC 474 lim = data + l; 475 #endif 476 while (l > 0) { 477 if (leftover) { 478 /* 479 * Data left over (from mbuf or 480 * realignment). Buffer the next 481 * byte, and write it and the 482 * leftover data out. 483 */ 484 savebyte[1] = *data++; 485 l--; 486 bus_space_write_stream_2(asict, asich, 487 NE2000_ASIC_DATA, 488 *(u_int16_t *)savebyte); 489 leftover = 0; 490 } else if (ALIGNED_POINTER(data, 491 u_int16_t) == 0) { 492 /* 493 * Unaligned data; buffer the next 494 * byte. 495 */ 496 savebyte[0] = *data++; 497 l--; 498 leftover = 1; 499 } else { 500 /* 501 * Aligned data; output contiguous 502 * words as much as we can, then 503 * buffer the remaining byte, if any. 504 */ 505 leftover = l & 1; 506 l &= ~1; 507 bus_space_write_multi_stream_2(asict, 508 asich, NE2000_ASIC_DATA, 509 (u_int16_t *)data, l >> 1); 510 data += l; 511 if (leftover) 512 savebyte[0] = *data++; 513 l = 0; 514 } 515 } 516 if (l < 0) 517 panic("ne2000_write_mbuf: negative len"); 518 #ifdef DIAGNOSTIC 519 if (data != lim) 520 panic("ne2000_write_mbuf: data != lim"); 521 #endif 522 } 523 if (leftover) { 524 savebyte[1] = 0; 525 bus_space_write_stream_2(asict, asich, NE2000_ASIC_DATA, 526 *(u_int16_t *)savebyte); 527 } 528 } 529 530 /* 531 * Wait for remote DMA to complete. This is necessary because on the 532 * transmit side, data is handled internally by the NIC in bursts, and 533 * we can't start another remote DMA until this one completes. Not 534 * waiting causes really bad things to happen - like the NIC wedging 535 * the bus. 536 */ 537 while (((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RDC) != 538 ED_ISR_RDC) && --maxwait); 539 540 if (maxwait == 0) { 541 log(LOG_WARNING, 542 "%s: remote transmit DMA failed to complete\n", 543 sc->sc_dev.dv_xname); 544 dp8390_reset(sc); 545 } 546 547 return (savelen); 548 } 549 550 /* 551 * Given a source and destination address, copy 'amout' of a packet from 552 * the ring buffer into a linear destination buffer. Takes into account 553 * ring-wrap. 554 */ 555 int 556 ne2000_ring_copy(sc, src, dst, amount) 557 struct dp8390_softc *sc; 558 int src; 559 caddr_t dst; 560 u_short amount; 561 { 562 struct ne2000_softc *nsc = (struct ne2000_softc *)sc; 563 bus_space_tag_t nict = sc->sc_regt; 564 bus_space_handle_t nich = sc->sc_regh; 565 bus_space_tag_t asict = nsc->sc_asict; 566 bus_space_handle_t asich = nsc->sc_asich; 567 u_short tmp_amount; 568 int useword = (nsc->sc_type == NE2000_TYPE_NE2000); 569 570 /* Does copy wrap to lower addr in ring buffer? */ 571 if (src + amount > sc->mem_end) { 572 tmp_amount = sc->mem_end - src; 573 574 /* Copy amount up to end of NIC memory. */ 575 ne2000_readmem(nict, nich, asict, asich, src, 576 (u_int8_t *)dst, tmp_amount, useword); 577 578 amount -= tmp_amount; 579 src = sc->mem_ring; 580 dst += tmp_amount; 581 } 582 583 ne2000_readmem(nict, nich, asict, asich, src, (u_int8_t *)dst, 584 amount, useword); 585 586 return (src + amount); 587 } 588 589 void 590 ne2000_read_hdr(sc, buf, hdr) 591 struct dp8390_softc *sc; 592 int buf; 593 struct dp8390_ring *hdr; 594 { 595 struct ne2000_softc *nsc = (struct ne2000_softc *)sc; 596 597 ne2000_readmem(sc->sc_regt, sc->sc_regh, nsc->sc_asict, nsc->sc_asich, 598 buf, (u_int8_t *)hdr, sizeof(struct dp8390_ring), 599 (nsc->sc_type == NE2000_TYPE_NE2000)); 600 #if BYTE_ORDER == BIG_ENDIAN 601 hdr->count = bswap16(hdr->count); 602 #endif 603 } 604 605 int 606 ne2000_test_mem(sc) 607 struct dp8390_softc *sc; 608 { 609 610 /* Noop. */ 611 return (0); 612 } 613 614 /* 615 * Given a NIC memory source address and a host memory destination address, 616 * copy 'amount' from NIC to host using programmed i/o. The 'amount' is 617 * rounded up to a word - ok as long as mbufs are word sized. 618 */ 619 void 620 ne2000_readmem(nict, nich, asict, asich, src, dst, amount, useword) 621 bus_space_tag_t nict; 622 bus_space_handle_t nich; 623 bus_space_tag_t asict; 624 bus_space_handle_t asich; 625 int src; 626 u_int8_t *dst; 627 size_t amount; 628 int useword; 629 { 630 631 /* Select page 0 registers. */ 632 bus_space_write_1(nict, nich, ED_P0_CR, 633 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 634 635 /* Round up to a word. */ 636 if (amount & 1) 637 ++amount; 638 639 /* Set up DMA byte count. */ 640 bus_space_write_1(nict, nich, ED_P0_RBCR0, amount); 641 bus_space_write_1(nict, nich, ED_P0_RBCR1, amount >> 8); 642 643 /* Set up source address in NIC mem. */ 644 bus_space_write_1(nict, nich, ED_P0_RSAR0, src); 645 bus_space_write_1(nict, nich, ED_P0_RSAR1, src >> 8); 646 647 bus_space_write_1(nict, nich, ED_P0_CR, 648 ED_CR_RD0 | ED_CR_PAGE_0 | ED_CR_STA); 649 650 if (useword) 651 bus_space_read_multi_stream_2(asict, asich, NE2000_ASIC_DATA, 652 (u_int16_t *)dst, amount >> 1); 653 else 654 bus_space_read_multi_1(asict, asich, NE2000_ASIC_DATA, 655 dst, amount); 656 } 657 658 /* 659 * Stripped down routine for writing a linear buffer to NIC memory. Only 660 * used in the probe routine to test the memory. 'len' must be even. 661 */ 662 void 663 ne2000_writemem(nict, nich, asict, asich, src, dst, len, useword) 664 bus_space_tag_t nict; 665 bus_space_handle_t nich; 666 bus_space_tag_t asict; 667 bus_space_handle_t asich; 668 u_int8_t *src; 669 int dst; 670 size_t len; 671 int useword; 672 { 673 int maxwait = 100; /* about 120us */ 674 675 /* Select page 0 registers. */ 676 bus_space_write_1(nict, nich, ED_P0_CR, 677 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 678 679 /* Reset remote DMA complete flag. */ 680 bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RDC); 681 682 /* Set up DMA byte count. */ 683 bus_space_write_1(nict, nich, ED_P0_RBCR0, len); 684 bus_space_write_1(nict, nich, ED_P0_RBCR1, len >> 8); 685 686 /* Set up destination address in NIC mem. */ 687 bus_space_write_1(nict, nich, ED_P0_RSAR0, dst); 688 bus_space_write_1(nict, nich, ED_P0_RSAR1, dst >> 8); 689 690 /* Set remote DMA write. */ 691 bus_space_write_1(nict, nich, ED_P0_CR, 692 ED_CR_RD1 | ED_CR_PAGE_0 | ED_CR_STA); 693 694 if (useword) 695 bus_space_write_multi_stream_2(asict, asich, NE2000_ASIC_DATA, 696 (u_int16_t *)src, len >> 1); 697 else 698 bus_space_write_multi_1(asict, asich, NE2000_ASIC_DATA, 699 src, len); 700 701 /* 702 * Wait for remote DMA to complete. This is necessary because on the 703 * transmit side, data is handled internally by the NIC in bursts, and 704 * we can't start another remote DMA until this one completes. Not 705 * waiting causes really bad things to happen - like the NIC wedging 706 * the bus. 707 */ 708 while (((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RDC) != 709 ED_ISR_RDC) && --maxwait); 710 711 if (maxwait == 0) 712 printf("ne2000_writemem: failed to complete\n"); 713 } 714
Indexes created Mon Oct 20 05:10:11 GMT 2025