ne2000.c revision 1.13
1 /* $NetBSD: ne2000.c,v 1.13 1998/10/13 08:33:05 msaitoh 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) 97 struct ne2000_softc *nsc; 98 u_int8_t *myea; 99 { 100 struct dp8390_softc *dsc = &nsc->sc_dp8390; 101 bus_space_tag_t nict = dsc->sc_regt; 102 bus_space_handle_t nich = dsc->sc_regh; 103 bus_space_tag_t asict = nsc->sc_asict; 104 bus_space_handle_t asich = nsc->sc_asich; 105 u_int8_t romdata[16]; 106 int memsize, i, useword; 107 108 /* 109 * Detect it again; this gives us the memory size. 110 */ 111 nsc->sc_type = ne2000_detect(nict, nich, asict, asich); 112 if (nsc->sc_type == 0) { 113 printf("%s: where did the card go?\n", dsc->sc_dev.dv_xname); 114 return; 115 } 116 117 useword = (nsc->sc_type == NE2000_TYPE_NE2000); 118 119 dsc->cr_proto = ED_CR_RD2; 120 121 /* 122 * DCR gets: 123 * 124 * FIFO threshold to 8, No auto-init Remote DMA, 125 * byte order=80x86. 126 * 127 * NE1000 gets byte-wide DMA, NE2000 gets word-wide DMA. 128 */ 129 dsc->dcr_reg = ED_DCR_FT1 | ED_DCR_LS | 130 (nsc->sc_type == NE2000_TYPE_NE2000 ? ED_DCR_WTS : 0); 131 132 dsc->test_mem = ne2000_test_mem; 133 dsc->ring_copy = ne2000_ring_copy; 134 dsc->write_mbuf = ne2000_write_mbuf; 135 dsc->read_hdr = ne2000_read_hdr; 136 137 /* Registers are linear. */ 138 for (i = 0; i < 16; i++) 139 dsc->sc_reg_map[i] = i; 140 141 /* 142 * 8k of memory plus an additional 8k if an NE2000. 143 */ 144 memsize = 8192 + (nsc->sc_type == NE2000_TYPE_NE2000 ? 8192 : 0); 145 146 /* 147 * NIC memory doens't start at zero on an NE board. 148 * The start address is tied to the bus width. 149 * (It happens to be computed the same way as mem size.) 150 */ 151 dsc->mem_start = memsize; 152 153 #ifdef GWETHER 154 { 155 int x, mstart = 0; 156 int8_t pbuf0[ED_PAGE_SIZE], pbuf[ED_PAGE_SIZE], 157 tbuf[ED_PAGE_SIZE]; 158 159 for (i = 0; i < ED_PAGE_SIZE; i++) 160 pbuf0[i] = 0; 161 162 /* Search for the start of RAM. */ 163 for (x = 1; x < 256; x++) { 164 ne2000_writemem(nict, nich, asict, asich, pbuf0, 165 x << ED_PAGE_SHIFT, ED_PAGE_SIZE, useword); 166 ne2000_readmem(nict, nich, asict, asich, 167 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, useword); 168 if (bcmp(pbuf0, tbuf, ED_PAGE_SIZE) == 0) { 169 for (i = 0; i < ED_PAGE_SIZE; i++) 170 pbuf[i] = 255 - x; 171 ne2000_writemem(nict, nich, asict, asich, 172 pbuf, x << ED_PAGE_SHIFT, ED_PAGE_SIZE, 173 useword); 174 ne2000_readmem(nict, nich, asict, asich, 175 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, 176 useword); 177 if (bcmp(pbuf, tbuf, ED_PAGE_SIZE) == 0) { 178 mstart = x << ED_PAGE_SHIFT; 179 memsize = ED_PAGE_SIZE; 180 break; 181 } 182 } 183 } 184 185 if (mstart == 0) { 186 printf("%s: cannot find start of RAM\n", 187 dsc->sc_dev.dv_xname); 188 return; 189 } 190 191 /* Search for the end of RAM. */ 192 for (++x; x < 256; x++) { 193 ne2000_writemem(nict, nich, asict, asich, pbuf0, 194 x << ED_PAGE_SHIFT, ED_PAGE_SIZE, useword); 195 ne2000_readmem(nict, nich, asict, asich, 196 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, useword); 197 if (bcmp(pbuf0, tbuf, ED_PAGE_SIZE) == 0) { 198 for (i = 0; i < ED_PAGE_SIZE; i++) 199 pbuf[i] = 255 - x; 200 ne2000_writemem(nict, nich, asict, asich, 201 pbuf, x << ED_PAGE_SHIFT, ED_PAGE_SIZE, 202 useword); 203 ne2000_readmem(nict, nich, asict, asich, 204 x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, 205 useword); 206 if (bcmp(pbuf, tbuf, ED_PAGE_SIZE) == 0) 207 memsize += ED_PAGE_SIZE; 208 else 209 break; 210 } else 211 break; 212 } 213 214 printf("%s: RAM start 0x%x, size %d\n", 215 dsc->sc_dev.dv_xname, mstart, memsize); 216 217 dsc->mem_start = mstart; 218 } 219 #endif /* GWETHER */ 220 221 dsc->mem_size = memsize; 222 223 if (myea == NULL) { 224 /* Read the station address. */ 225 ne2000_readmem(nict, nich, asict, asich, 0, romdata, 226 sizeof(romdata), useword); 227 for (i = 0; i < ETHER_ADDR_LEN; i++) 228 dsc->sc_enaddr[i] = romdata[i * (useword ? 2 : 1)]; 229 } else 230 bcopy(myea, dsc->sc_enaddr, sizeof(dsc->sc_enaddr)); 231 232 /* Clear any pending interrupts that might have occurred above. */ 233 bus_space_write_1(nict, nich, ED_P0_ISR, 0xff); 234 235 if (dp8390_config(dsc, NULL, 0, 0)) { 236 printf("%s: setup failed\n", dsc->sc_dev.dv_xname); 237 return; 238 } 239 240 /* 241 * We need to compute mem_ring a bit differently; override the 242 * value set up in dp8390_config(). 243 */ 244 dsc->mem_ring = 245 dsc->mem_start + ((dsc->txb_cnt * ED_TXBUF_SIZE) << ED_PAGE_SHIFT); 246 } 247 248 /* 249 * Detect an NE-2000 or compatible. Returns a model code. 250 */ 251 int 252 ne2000_detect(nict, nich, asict, asich) 253 bus_space_tag_t nict; 254 bus_space_handle_t nich; 255 bus_space_tag_t asict; 256 bus_space_handle_t asich; 257 { 258 static u_int8_t test_pattern[32] = "THIS is A memory TEST pattern"; 259 u_int8_t test_buffer[32], tmp; 260 int i, rv = 0; 261 262 /* Reset the board. */ 263 #ifdef GWETHER 264 bus_space_write_1(asict, asich, NE2000_ASIC_RESET, 0); 265 delay(200); 266 #endif /* GWETHER */ 267 tmp = bus_space_read_1(asict, asich, NE2000_ASIC_RESET); 268 delay(10000); 269 270 /* 271 * I don't know if this is necessary; probably cruft leftover from 272 * Clarkson packet driver code. Doesn't do a thing on the boards I've 273 * tested. -DG [note that a outb(0x84, 0) seems to work here, and is 274 * non-invasive...but some boards don't seem to reset and I don't have 275 * complete documentation on what the 'right' thing to do is...so we do 276 * the invasive thing for now. Yuck.] 277 */ 278 bus_space_write_1(asict, asich, NE2000_ASIC_RESET, tmp); 279 delay(5000); 280 281 /* 282 * This is needed because some NE clones apparently don't reset the 283 * NIC properly (or the NIC chip doesn't reset fully on power-up). 284 * XXX - this makes the probe invasive! Done against my better 285 * judgement. -DLG 286 */ 287 bus_space_write_1(nict, nich, ED_P0_CR, 288 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STP); 289 290 delay(5000); 291 292 /* 293 * Generic probe routine for testing for the existance of a DS8390. 294 * Must be performed after the NIC has just been reset. This 295 * works by looking at certain register values that are guaranteed 296 * to be initialized a certain way after power-up or reset. 297 * 298 * Specifically: 299 * 300 * Register reset bits set bits 301 * -------- ---------- -------- 302 * CR TXP, STA RD2, STP 303 * ISR RST 304 * IMR <all> 305 * DCR LAS 306 * TCR LB1, LB0 307 * 308 * We only look at CR and ISR, however, since looking at the others 309 * would require changing register pages, which would be intrusive 310 * if this isn't an 8390. 311 */ 312 313 tmp = bus_space_read_1(nict, nich, ED_P0_CR); 314 if ((tmp & (ED_CR_RD2 | ED_CR_TXP | ED_CR_STA | ED_CR_STP)) != 315 (ED_CR_RD2 | ED_CR_STP)) 316 goto out; 317 318 tmp = bus_space_read_1(nict, nich, ED_P0_ISR); 319 if ((tmp & ED_ISR_RST) != ED_ISR_RST) 320 goto out; 321 322 bus_space_write_1(nict, nich, 323 ED_P0_CR, ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 324 325 for (i = 0; i < 100; i++) { 326 if ((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RST) == 327 ED_ISR_RST) { 328 /* Ack the reset bit. */ 329 bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RST); 330 break; 331 } 332 delay(100); 333 } 334 335 #if 0 336 /* XXX */ 337 if (i == 100) 338 goto out; 339 #endif 340 341 /* 342 * Test the ability to read and write to the NIC memory. This has 343 * the side effect of determining if this is an NE1000 or an NE2000. 344 */ 345 346 /* 347 * This prevents packets from being stored in the NIC memory when 348 * the readmem routine turns on the start bit in the CR. 349 */ 350 bus_space_write_1(nict, nich, ED_P0_RCR, ED_RCR_MON); 351 352 /* Temporarily initialize DCR for byte operations. */ 353 bus_space_write_1(nict, nich, ED_P0_DCR, ED_DCR_FT1 | ED_DCR_LS); 354 355 bus_space_write_1(nict, nich, ED_P0_PSTART, 8192 >> ED_PAGE_SHIFT); 356 bus_space_write_1(nict, nich, ED_P0_PSTOP, 16384 >> ED_PAGE_SHIFT); 357 358 /* 359 * Write a test pattern in byte mode. If this fails, then there 360 * probably isn't any memory at 8k - which likely means that the 361 * board is an NE2000. 362 */ 363 ne2000_writemem(nict, nich, asict, asich, test_pattern, 8192, 364 sizeof(test_pattern), 0); 365 ne2000_readmem(nict, nich, asict, asich, 8192, test_buffer, 366 sizeof(test_buffer), 0); 367 368 if (bcmp(test_pattern, test_buffer, sizeof(test_pattern))) { 369 /* not an NE1000 - try NE2000 */ 370 bus_space_write_1(nict, nich, ED_P0_DCR, 371 ED_DCR_WTS | ED_DCR_FT1 | ED_DCR_LS); 372 bus_space_write_1(nict, nich, ED_P0_PSTART, 373 16384 >> ED_PAGE_SHIFT); 374 bus_space_write_1(nict, nich, ED_P0_PSTOP, 375 32768 >> ED_PAGE_SHIFT); 376 377 /* 378 * Write the test pattern in word mode. If this also fails, 379 * then we don't know what this board is. 380 */ 381 ne2000_writemem(nict, nich, asict, asich, test_pattern, 16384, 382 sizeof(test_pattern), 1); 383 ne2000_readmem(nict, nich, asict, asich, 16384, test_buffer, 384 sizeof(test_buffer), 1); 385 386 if (bcmp(test_pattern, test_buffer, sizeof(test_pattern))) 387 goto out; /* not an NE2000 either */ 388 389 rv = NE2000_TYPE_NE2000; 390 } else { 391 /* We're an NE1000. */ 392 rv = NE2000_TYPE_NE1000; 393 } 394 395 /* Clear any pending interrupts that might have occurred above. */ 396 bus_space_write_1(nict, nich, ED_P0_ISR, 0xff); 397 398 out: 399 return (rv); 400 } 401 402 /* 403 * Write an mbuf chain to the destination NIC memory address using programmed 404 * I/O. 405 */ 406 int 407 ne2000_write_mbuf(sc, m, buf) 408 struct dp8390_softc *sc; 409 struct mbuf *m; 410 int buf; 411 { 412 struct ne2000_softc *nsc = (struct ne2000_softc *)sc; 413 bus_space_tag_t nict = sc->sc_regt; 414 bus_space_handle_t nich = sc->sc_regh; 415 bus_space_tag_t asict = nsc->sc_asict; 416 bus_space_handle_t asich = nsc->sc_asich; 417 int savelen; 418 int maxwait = 100; /* about 120us */ 419 420 savelen = m->m_pkthdr.len; 421 422 /* Select page 0 registers. */ 423 bus_space_write_1(nict, nich, ED_P0_CR, 424 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 425 426 /* Reset remote DMA complete flag. */ 427 bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RDC); 428 429 /* Set up DMA byte count. */ 430 bus_space_write_1(nict, nich, ED_P0_RBCR0, savelen); 431 bus_space_write_1(nict, nich, ED_P0_RBCR1, savelen >> 8); 432 433 /* Set up destination address in NIC mem. */ 434 bus_space_write_1(nict, nich, ED_P0_RSAR0, buf); 435 bus_space_write_1(nict, nich, ED_P0_RSAR1, buf >> 8); 436 437 /* Set remote DMA write. */ 438 bus_space_write_1(nict, nich, 439 ED_P0_CR, ED_CR_RD1 | ED_CR_PAGE_0 | ED_CR_STA); 440 441 /* 442 * Transfer the mbuf chain to the NIC memory. NE2000 cards 443 * require that data be transferred as words, and only words, 444 * so that case requires some extra code to patch over odd-length 445 * mbufs. 446 */ 447 if (nsc->sc_type == NE2000_TYPE_NE1000) { 448 /* NE1000s are easy. */ 449 for (; m != 0; m = m->m_next) { 450 if (m->m_len) { 451 bus_space_write_multi_1(asict, asich, 452 NE2000_ASIC_DATA, mtod(m, u_int8_t *), 453 m->m_len); 454 } 455 } 456 } else { 457 /* NE2000s are a bit trickier. */ 458 u_int8_t *data, savebyte[2]; 459 int l, leftover; 460 #ifdef DIAGNOSTIC 461 u_int8_t *lim; 462 #endif 463 /* Start out with no leftover data. */ 464 leftover = 0; 465 savebyte[0] = savebyte[1] = 0; 466 467 for (; m != 0; m = m->m_next) { 468 l = m->m_len; 469 if (l == 0) 470 continue; 471 data = mtod(m, u_int8_t *); 472 #ifdef DIAGNOSTIC 473 lim = data + l; 474 #endif 475 while (l > 0) { 476 if (leftover) { 477 /* 478 * Data left over (from mbuf or 479 * realignment). Buffer the next 480 * byte, and write it and the 481 * leftover data out. 482 */ 483 savebyte[1] = *data++; 484 l--; 485 bus_space_write_stream_2(asict, asich, 486 NE2000_ASIC_DATA, 487 *(u_int16_t *)savebyte); 488 leftover = 0; 489 } else if (ALIGNED_POINTER(data, 490 u_int16_t) == 0) { 491 /* 492 * Unaligned data; buffer the next 493 * byte. 494 */ 495 savebyte[0] = *data++; 496 l--; 497 leftover = 1; 498 } else { 499 /* 500 * Aligned data; output contiguous 501 * words as much as we can, then 502 * buffer the remaining byte, if any. 503 */ 504 leftover = l & 1; 505 l &= ~1; 506 bus_space_write_multi_stream_2(asict, 507 asich, NE2000_ASIC_DATA, 508 (u_int16_t *)data, l >> 1); 509 data += l; 510 if (leftover) 511 savebyte[0] = *data++; 512 l = 0; 513 } 514 } 515 if (l < 0) 516 panic("ne2000_write_mbuf: negative len"); 517 #ifdef DIAGNOSTIC 518 if (data != lim) 519 panic("ne2000_write_mbuf: data != lim"); 520 #endif 521 } 522 if (leftover) { 523 savebyte[1] = 0; 524 bus_space_write_stream_2(asict, asich, NE2000_ASIC_DATA, 525 *(u_int16_t *)savebyte); 526 } 527 } 528 529 /* 530 * Wait for remote DMA to complete. This is necessary because on the 531 * transmit side, data is handled internally by the NIC in bursts, and 532 * we can't start another remote DMA until this one completes. Not 533 * waiting causes really bad things to happen - like the NIC wedging 534 * the bus. 535 */ 536 while (((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RDC) != 537 ED_ISR_RDC) && --maxwait); 538 539 if (maxwait == 0) { 540 log(LOG_WARNING, 541 "%s: remote transmit DMA failed to complete\n", 542 sc->sc_dev.dv_xname); 543 dp8390_reset(sc); 544 } 545 546 return (savelen); 547 } 548 549 /* 550 * Given a source and destination address, copy 'amout' of a packet from 551 * the ring buffer into a linear destination buffer. Takes into account 552 * ring-wrap. 553 */ 554 int 555 ne2000_ring_copy(sc, src, dst, amount) 556 struct dp8390_softc *sc; 557 int src; 558 caddr_t dst; 559 u_short amount; 560 { 561 struct ne2000_softc *nsc = (struct ne2000_softc *)sc; 562 bus_space_tag_t nict = sc->sc_regt; 563 bus_space_handle_t nich = sc->sc_regh; 564 bus_space_tag_t asict = nsc->sc_asict; 565 bus_space_handle_t asich = nsc->sc_asich; 566 u_short tmp_amount; 567 int useword = (nsc->sc_type == NE2000_TYPE_NE2000); 568 569 /* Does copy wrap to lower addr in ring buffer? */ 570 if (src + amount > sc->mem_end) { 571 tmp_amount = sc->mem_end - src; 572 573 /* Copy amount up to end of NIC memory. */ 574 ne2000_readmem(nict, nich, asict, asich, src, 575 (u_int8_t *)dst, tmp_amount, useword); 576 577 amount -= tmp_amount; 578 src = sc->mem_ring; 579 dst += tmp_amount; 580 } 581 582 ne2000_readmem(nict, nich, asict, asich, src, (u_int8_t *)dst, 583 amount, useword); 584 585 return (src + amount); 586 } 587 588 void 589 ne2000_read_hdr(sc, buf, hdr) 590 struct dp8390_softc *sc; 591 int buf; 592 struct dp8390_ring *hdr; 593 { 594 struct ne2000_softc *nsc = (struct ne2000_softc *)sc; 595 596 ne2000_readmem(sc->sc_regt, sc->sc_regh, nsc->sc_asict, nsc->sc_asich, 597 buf, (u_int8_t *)hdr, sizeof(struct dp8390_ring), 598 (nsc->sc_type == NE2000_TYPE_NE2000)); 599 #if BYTE_ORDER == BIG_ENDIAN 600 hdr->count = bswap16(hdr->count); 601 #endif 602 } 603 604 int 605 ne2000_test_mem(sc) 606 struct dp8390_softc *sc; 607 { 608 609 /* Noop. */ 610 return (0); 611 } 612 613 /* 614 * Given a NIC memory source address and a host memory destination address, 615 * copy 'amount' from NIC to host using programmed i/o. The 'amount' is 616 * rounded up to a word - ok as long as mbufs are word sized. 617 */ 618 void 619 ne2000_readmem(nict, nich, asict, asich, src, dst, amount, useword) 620 bus_space_tag_t nict; 621 bus_space_handle_t nich; 622 bus_space_tag_t asict; 623 bus_space_handle_t asich; 624 int src; 625 u_int8_t *dst; 626 size_t amount; 627 int useword; 628 { 629 630 /* Select page 0 registers. */ 631 bus_space_write_1(nict, nich, ED_P0_CR, 632 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 633 634 /* Round up to a word. */ 635 if (amount & 1) 636 ++amount; 637 638 /* Set up DMA byte count. */ 639 bus_space_write_1(nict, nich, ED_P0_RBCR0, amount); 640 bus_space_write_1(nict, nich, ED_P0_RBCR1, amount >> 8); 641 642 /* Set up source address in NIC mem. */ 643 bus_space_write_1(nict, nich, ED_P0_RSAR0, src); 644 bus_space_write_1(nict, nich, ED_P0_RSAR1, src >> 8); 645 646 bus_space_write_1(nict, nich, ED_P0_CR, 647 ED_CR_RD0 | ED_CR_PAGE_0 | ED_CR_STA); 648 649 if (useword) 650 bus_space_read_multi_stream_2(asict, asich, NE2000_ASIC_DATA, 651 (u_int16_t *)dst, amount >> 1); 652 else 653 bus_space_read_multi_1(asict, asich, NE2000_ASIC_DATA, 654 dst, amount); 655 } 656 657 /* 658 * Stripped down routine for writing a linear buffer to NIC memory. Only 659 * used in the probe routine to test the memory. 'len' must be even. 660 */ 661 void 662 ne2000_writemem(nict, nich, asict, asich, src, dst, len, useword) 663 bus_space_tag_t nict; 664 bus_space_handle_t nich; 665 bus_space_tag_t asict; 666 bus_space_handle_t asich; 667 u_int8_t *src; 668 int dst; 669 size_t len; 670 int useword; 671 { 672 int maxwait = 100; /* about 120us */ 673 674 /* Select page 0 registers. */ 675 bus_space_write_1(nict, nich, ED_P0_CR, 676 ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA); 677 678 /* Reset remote DMA complete flag. */ 679 bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RDC); 680 681 /* Set up DMA byte count. */ 682 bus_space_write_1(nict, nich, ED_P0_RBCR0, len); 683 bus_space_write_1(nict, nich, ED_P0_RBCR1, len >> 8); 684 685 /* Set up destination address in NIC mem. */ 686 bus_space_write_1(nict, nich, ED_P0_RSAR0, dst); 687 bus_space_write_1(nict, nich, ED_P0_RSAR1, dst >> 8); 688 689 /* Set remote DMA write. */ 690 bus_space_write_1(nict, nich, ED_P0_CR, 691 ED_CR_RD1 | ED_CR_PAGE_0 | ED_CR_STA); 692 693 if (useword) 694 bus_space_write_multi_stream_2(asict, asich, NE2000_ASIC_DATA, 695 (u_int16_t *)src, len >> 1); 696 else 697 bus_space_write_multi_1(asict, asich, NE2000_ASIC_DATA, 698 src, len); 699 700 /* 701 * Wait for remote DMA to complete. This is necessary because on the 702 * transmit side, data is handled internally by the NIC in bursts, and 703 * we can't start another remote DMA until this one completes. Not 704 * waiting causes really bad things to happen - like the NIC wedging 705 * the bus. 706 */ 707 while (((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RDC) != 708 ED_ISR_RDC) && --maxwait); 709 710 if (maxwait == 0) 711 printf("ne2000_writemem: failed to complete\n"); 712 } 713
Indexes created Tue Sep 23 02:09:52 GMT 2025