Annotation of sys/dev/ic/ne2000.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ne2000.c,v 1.23 2006/11/07 01:46:59 brad Exp $ */
2: /* $NetBSD: ne2000.c,v 1.12 1998/06/10 01:15:50 thorpej Exp $ */
3:
4: /*-
5: * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
10: * NASA Ames Research Center.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. All advertising materials mentioning features or use of this software
21: * must display the following acknowledgement:
22: * This product includes software developed by the NetBSD
23: * Foundation, Inc. and its contributors.
24: * 4. Neither the name of The NetBSD Foundation nor the names of its
25: * contributors may be used to endorse or promote products derived
26: * from this software without specific prior written permission.
27: *
28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38: * POSSIBILITY OF SUCH DAMAGE.
39: */
40:
41: /*
42: * Device driver for National Semiconductor DS8390/WD83C690 based ethernet
43: * adapters.
44: *
45: * Copyright (c) 1994, 1995 Charles M. Hannum. All rights reserved.
46: *
47: * Copyright (C) 1993, David Greenman. This software may be used, modified,
48: * copied, distributed, and sold, in both source and binary form provided that
49: * the above copyright and these terms are retained. Under no circumstances is
50: * the author responsible for the proper functioning of this software, nor does
51: * the author assume any responsibility for damages incurred with its use.
52: */
53:
54: /*
55: * Common code shared by all NE2000-compatible Ethernet interfaces.
56: */
57:
58: #include <sys/param.h>
59: #include <sys/systm.h>
60: #include <sys/device.h>
61: #include <sys/socket.h>
62: #include <sys/mbuf.h>
63: #include <sys/syslog.h>
64:
65: #include <net/if.h>
66: #include <net/if_dl.h>
67: #include <net/if_types.h>
68: #include <net/if_media.h>
69:
70: #include <netinet/in.h>
71: #include <netinet/if_ether.h>
72:
73: #include <machine/bus.h>
74:
75: #include <dev/ic/dp8390reg.h>
76: #include <dev/ic/dp8390var.h>
77:
78: #include <dev/ic/ne2000reg.h>
79: #include <dev/ic/ne2000var.h>
80:
81: #include <dev/ic/ax88190reg.h>
82:
83: int ne2000_write_mbuf(struct dp8390_softc *, struct mbuf *, int);
84: int ne2000_ring_copy(struct dp8390_softc *, int, caddr_t, u_short);
85: void ne2000_read_hdr(struct dp8390_softc *, int, struct dp8390_ring *);
86: int ne2000_test_mem(struct dp8390_softc *);
87:
88: void ne2000_writemem(bus_space_tag_t, bus_space_handle_t,
89: bus_space_tag_t, bus_space_handle_t, u_int8_t *, int, size_t, int);
90: void ne2000_readmem(bus_space_tag_t, bus_space_handle_t,
91: bus_space_tag_t, bus_space_handle_t, int, u_int8_t *, size_t, int);
92:
93: #define ASIC_BARRIER(asict, asich) \
94: bus_space_barrier((asict), (asich), 0, 0x10, \
95: BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE)
96:
97: struct cfdriver ne_cd = {
98: NULL, "ne", DV_IFNET
99: };
100:
101: int
102: ne2000_attach(struct ne2000_softc *nsc, u_int8_t *myea)
103: {
104: struct dp8390_softc *dsc = &nsc->sc_dp8390;
105: bus_space_tag_t nict = dsc->sc_regt;
106: bus_space_handle_t nich = dsc->sc_regh;
107: bus_space_tag_t asict = nsc->sc_asict;
108: bus_space_handle_t asich = nsc->sc_asich;
109: u_int8_t romdata[16];
110: int memsize, i, useword;
111:
112: /*
113: * Detect it again unless caller specified it; this gives us
114: * the memory size.
115: */
116: if (nsc->sc_type == NE2000_TYPE_UNKNOWN)
117: nsc->sc_type = ne2000_detect(nsc);
118:
119: /*
120: * 8k of memory for NE1000, 16k otherwise.
121: */
122: switch (nsc->sc_type) {
123: case NE2000_TYPE_UNKNOWN:
124: default:
125: printf(": where did the card go?\n");
126: return (1);
127: case NE2000_TYPE_NE1000:
128: memsize = 8192;
129: useword = 0;
130: break;
131: case NE2000_TYPE_NE2000:
132: case NE2000_TYPE_AX88190: /* XXX really? */
133: case NE2000_TYPE_AX88790:
134: case NE2000_TYPE_DL10019:
135: case NE2000_TYPE_DL10022:
136: memsize = 8192 * 2;
137: useword = 1;
138: break;
139: }
140:
141: nsc->sc_useword = useword;
142:
143: dsc->cr_proto = ED_CR_RD2;
144: if (nsc->sc_type == NE2000_TYPE_AX88190 ||
145: nsc->sc_type == NE2000_TYPE_AX88790) {
146: dsc->rcr_proto = ED_RCR_INTT;
147: dsc->sc_flags |= DP8390_DO_AX88190_WORKAROUND;
148: } else
149: dsc->rcr_proto = 0;
150:
151: /*
152: * DCR gets:
153: *
154: * FIFO threshold to 8, No auto-init Remote DMA,
155: * byte order=80x86.
156: *
157: * NE1000 gets byte-wide DMA, NE2000 gets word-wide DMA.
158: */
159: dsc->dcr_reg = ED_DCR_FT1 | ED_DCR_LS | (useword ? ED_DCR_WTS : 0);
160:
161: dsc->test_mem = ne2000_test_mem;
162: dsc->ring_copy = ne2000_ring_copy;
163: dsc->write_mbuf = ne2000_write_mbuf;
164: dsc->read_hdr = ne2000_read_hdr;
165:
166: /* Registers are linear. */
167: for (i = 0; i < 16; i++)
168: dsc->sc_reg_map[i] = i;
169:
170: /*
171: * NIC memory doens't start at zero on an NE board.
172: * The start address is tied to the bus width.
173: * (It happens to be computed the same way as mem size.)
174: */
175: dsc->mem_start = memsize;
176:
177: #ifdef GWETHER
178: {
179: int x, mstart = 0;
180: int8_t pbuf0[ED_PAGE_SIZE], pbuf[ED_PAGE_SIZE],
181: tbuf[ED_PAGE_SIZE];
182:
183: for (i = 0; i < ED_PAGE_SIZE; i++)
184: pbuf0[i] = 0;
185:
186: /* Search for the start of RAM. */
187: for (x = 1; x < 256; x++) {
188: ne2000_writemem(nict, nich, asict, asich, pbuf0,
189: x << ED_PAGE_SHIFT, ED_PAGE_SIZE, useword);
190: ne2000_readmem(nict, nich, asict, asich,
191: x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, useword);
192: if (bcmp(pbuf0, tbuf, ED_PAGE_SIZE) == 0) {
193: for (i = 0; i < ED_PAGE_SIZE; i++)
194: pbuf[i] = 255 - x;
195: ne2000_writemem(nict, nich, asict, asich,
196: pbuf, x << ED_PAGE_SHIFT, ED_PAGE_SIZE,
197: useword);
198: ne2000_readmem(nict, nich, asict, asich,
199: x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE,
200: useword);
201: if (bcmp(pbuf, tbuf, ED_PAGE_SIZE) == 0) {
202: mstart = x << ED_PAGE_SHIFT;
203: memsize = ED_PAGE_SIZE;
204: break;
205: }
206: }
207: }
208:
209: if (mstart == 0) {
210: printf(": cannot find start of RAM\n");
211: return;
212: }
213:
214: /* Search for the end of RAM. */
215: for (++x; x < 256; x++) {
216: ne2000_writemem(nict, nich, asict, asich, pbuf0,
217: x << ED_PAGE_SHIFT, ED_PAGE_SIZE, useword);
218: ne2000_readmem(nict, nich, asict, asich,
219: x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE, useword);
220: if (bcmp(pbuf0, tbuf, ED_PAGE_SIZE) == 0) {
221: for (i = 0; i < ED_PAGE_SIZE; i++)
222: pbuf[i] = 255 - x;
223: ne2000_writemem(nict, nich, asict, asich,
224: pbuf, x << ED_PAGE_SHIFT, ED_PAGE_SIZE,
225: useword);
226: ne2000_readmem(nict, nich, asict, asich,
227: x << ED_PAGE_SHIFT, tbuf, ED_PAGE_SIZE,
228: useword);
229: if (bcmp(pbuf, tbuf, ED_PAGE_SIZE) == 0)
230: memsize += ED_PAGE_SIZE;
231: else
232: break;
233: } else
234: break;
235: }
236:
237: printf(": RAM start 0x%x, size %d\n",
238: mstart, memsize);
239:
240: dsc->mem_start = mstart;
241: }
242: #endif /* GWETHER */
243:
244: dsc->mem_size = memsize;
245:
246: if (myea == NULL) {
247: /* Read the station address. */
248: if (nsc->sc_type == NE2000_TYPE_AX88190 ||
249: nsc->sc_type == NE2000_TYPE_AX88790) {
250: /* Select page 0 registers. */
251: NIC_BARRIER(nict, nich);
252: bus_space_write_1(nict, nich, ED_P0_CR,
253: ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA);
254: NIC_BARRIER(nict, nich);
255: /* Select word transfer. */
256: bus_space_write_1(nict, nich, ED_P0_DCR, ED_DCR_WTS);
257: NIC_BARRIER(nict, nich);
258: ne2000_readmem(nict, nich, asict, asich,
259: AX88190_NODEID_OFFSET, dsc->sc_arpcom.ac_enaddr,
260: ETHER_ADDR_LEN, useword);
261: } else {
262: ne2000_readmem(nict, nich, asict, asich, 0, romdata,
263: sizeof(romdata), useword);
264: for (i = 0; i < ETHER_ADDR_LEN; i++)
265: dsc->sc_arpcom.ac_enaddr[i] =
266: romdata[i * (useword ? 2 : 1)];
267: }
268: } else
269: bcopy(myea, dsc->sc_arpcom.ac_enaddr, ETHER_ADDR_LEN);
270:
271: /* Clear any pending interrupts that might have occurred above. */
272: NIC_BARRIER(nict, nich);
273: bus_space_write_1(nict, nich, ED_P0_ISR, 0xff);
274: NIC_BARRIER(nict, nich);
275:
276: if (dsc->sc_media_init == NULL)
277: dsc->sc_media_init = dp8390_media_init;
278:
279: if (dp8390_config(dsc)) {
280: printf(": setup failed\n");
281: return (1);
282: }
283:
284: /*
285: * We need to compute mem_ring a bit differently; override the
286: * value set up in dp8390_config().
287: */
288: dsc->mem_ring =
289: dsc->mem_start + ((dsc->txb_cnt * ED_TXBUF_SIZE) << ED_PAGE_SHIFT);
290:
291: return (0);
292: }
293:
294: /*
295: * Detect an NE-2000 or compatible. Returns a model code.
296: */
297: int
298: ne2000_detect(struct ne2000_softc *nsc)
299: {
300: struct dp8390_softc *dsc = &nsc->sc_dp8390;
301: bus_space_tag_t nict = dsc->sc_regt;
302: bus_space_handle_t nich = dsc->sc_regh;
303: bus_space_tag_t asict = nsc->sc_asict;
304: bus_space_handle_t asich = nsc->sc_asich;
305: static u_int8_t test_pattern[32] = "THIS is A memory TEST pattern";
306: u_int8_t test_buffer[32], tmp;
307: int state, i, rv = 0;
308:
309: state = dsc->sc_enabled;
310: dsc->sc_enabled = 0;
311:
312: /* Reset the board. */
313: #ifdef GWETHER
314: bus_space_write_1(asict, asich, NE2000_ASIC_RESET, 0);
315: ASIC_BARRIER(asict, asich);
316: delay(200);
317: #endif /* GWETHER */
318: tmp = bus_space_read_1(asict, asich, NE2000_ASIC_RESET);
319: ASIC_BARRIER(asict, asich);
320: delay(10000);
321:
322: /*
323: * I don't know if this is necessary; probably cruft leftover from
324: * Clarkson packet driver code. Doesn't do a thing on the boards I've
325: * tested. -DG [note that a outb(0x84, 0) seems to work here, and is
326: * non-invasive...but some boards don't seem to reset and I don't have
327: * complete documentation on what the 'right' thing to do is...so we do
328: * the invasive thing for now. Yuck.]
329: */
330: bus_space_write_1(asict, asich, NE2000_ASIC_RESET, tmp);
331: ASIC_BARRIER(asict, asich);
332: delay(5000);
333:
334: /*
335: * This is needed because some NE clones apparently don't reset the
336: * NIC properly (or the NIC chip doesn't reset fully on power-up).
337: * XXX - this makes the probe invasive! Done against my better
338: * judgement. -DLG
339: */
340: bus_space_write_1(nict, nich, ED_P0_CR,
341: ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STP);
342: NIC_BARRIER(nict, nich);
343:
344: delay(5000);
345:
346: /*
347: * Generic probe routine for testing for the existence of a DS8390.
348: * Must be performed after the NIC has just been reset. This
349: * works by looking at certain register values that are guaranteed
350: * to be initialized a certain way after power-up or reset.
351: *
352: * Specifically:
353: *
354: * Register reset bits set bits
355: * -------- ---------- --------
356: * CR TXP, STA RD2, STP
357: * ISR RST
358: * IMR <all>
359: * DCR LAS
360: * TCR LB1, LB0
361: *
362: * We only look at CR and ISR, however, since looking at the others
363: * would require changing register pages, which would be intrusive
364: * if this isn't an 8390.
365: */
366:
367: tmp = bus_space_read_1(nict, nich, ED_P0_CR);
368: if ((tmp & (ED_CR_RD2 | ED_CR_TXP | ED_CR_STA | ED_CR_STP)) !=
369: (ED_CR_RD2 | ED_CR_STP))
370: goto out;
371:
372: tmp = bus_space_read_1(nict, nich, ED_P0_ISR);
373: if ((tmp & ED_ISR_RST) != ED_ISR_RST)
374: goto out;
375:
376: bus_space_write_1(nict, nich,
377: ED_P0_CR, ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA);
378: NIC_BARRIER(nict, nich);
379:
380: for (i = 0; i < 100; i++) {
381: if ((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RST) ==
382: ED_ISR_RST) {
383: /* Ack the reset bit. */
384: bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RST);
385: NIC_BARRIER(nict, nich);
386: break;
387: }
388: delay(100);
389: }
390:
391: #if 0
392: /* XXX */
393: if (i == 100)
394: goto out;
395: #endif
396:
397: /*
398: * Test the ability to read and write to the NIC memory. This has
399: * the side effect of determining if this is an NE1000 or an NE2000.
400: */
401:
402: /*
403: * This prevents packets from being stored in the NIC memory when
404: * the readmem routine turns on the start bit in the CR.
405: */
406: bus_space_write_1(nict, nich, ED_P0_RCR, ED_RCR_MON);
407: NIC_BARRIER(nict, nich);
408:
409: /* Temporarily initialize DCR for byte operations. */
410: bus_space_write_1(nict, nich, ED_P0_DCR, ED_DCR_FT1 | ED_DCR_LS);
411:
412: bus_space_write_1(nict, nich, ED_P0_PSTART, 8192 >> ED_PAGE_SHIFT);
413: bus_space_write_1(nict, nich, ED_P0_PSTOP, 16384 >> ED_PAGE_SHIFT);
414:
415: /*
416: * Write a test pattern in byte mode. If this fails, then there
417: * probably isn't any memory at 8k - which likely means that the
418: * board is an NE2000.
419: */
420: ne2000_writemem(nict, nich, asict, asich, test_pattern, 8192,
421: sizeof(test_pattern), 0);
422: ne2000_readmem(nict, nich, asict, asich, 8192, test_buffer,
423: sizeof(test_buffer), 0);
424:
425: if (bcmp(test_pattern, test_buffer, sizeof(test_pattern))) {
426: /* not an NE1000 - try NE2000 */
427: bus_space_write_1(nict, nich, ED_P0_DCR,
428: ED_DCR_WTS | ED_DCR_FT1 | ED_DCR_LS);
429: bus_space_write_1(nict, nich, ED_P0_PSTART,
430: 16384 >> ED_PAGE_SHIFT);
431: bus_space_write_1(nict, nich, ED_P0_PSTOP,
432: 32768 >> ED_PAGE_SHIFT);
433:
434: /*
435: * Write the test pattern in word mode. If this also fails,
436: * then we don't know what this board is.
437: */
438: ne2000_writemem(nict, nich, asict, asich, test_pattern, 16384,
439: sizeof(test_pattern), 1);
440: ne2000_readmem(nict, nich, asict, asich, 16384, test_buffer,
441: sizeof(test_buffer), 1);
442:
443: if (bcmp(test_pattern, test_buffer, sizeof(test_pattern)))
444: goto out; /* not an NE2000 either */
445:
446: rv = NE2000_TYPE_NE2000;
447: } else {
448: /* We're an NE1000. */
449: rv = NE2000_TYPE_NE1000;
450: }
451:
452: /* Clear any pending interrupts that might have occurred above. */
453: NIC_BARRIER(nict, nich);
454: bus_space_write_1(nict, nich, ED_P0_ISR, 0xff);
455:
456: out:
457: dsc->sc_enabled = state;
458:
459: return (rv);
460: }
461:
462: /*
463: * Write an mbuf chain to the destination NIC memory address using programmed
464: * I/O.
465: */
466: int
467: ne2000_write_mbuf(struct dp8390_softc *sc, struct mbuf *m, int buf)
468: {
469: struct ne2000_softc *nsc = (struct ne2000_softc *)sc;
470: bus_space_tag_t nict = sc->sc_regt;
471: bus_space_handle_t nich = sc->sc_regh;
472: bus_space_tag_t asict = nsc->sc_asict;
473: bus_space_handle_t asich = nsc->sc_asich;
474: int savelen;
475: int maxwait = 100; /* about 120us */
476:
477: savelen = m->m_pkthdr.len;
478:
479: /* Select page 0 registers. */
480: NIC_BARRIER(nict, nich);
481: bus_space_write_1(nict, nich, ED_P0_CR,
482: ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA);
483: NIC_BARRIER(nict, nich);
484:
485: /* Reset remote DMA complete flag. */
486: bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RDC);
487: NIC_BARRIER(nict, nich);
488:
489: /* Set up DMA byte count. */
490: bus_space_write_1(nict, nich, ED_P0_RBCR0, savelen);
491: bus_space_write_1(nict, nich, ED_P0_RBCR1, savelen >> 8);
492:
493: /* Set up destination address in NIC mem. */
494: bus_space_write_1(nict, nich, ED_P0_RSAR0, buf);
495: bus_space_write_1(nict, nich, ED_P0_RSAR1, buf >> 8);
496:
497: /* Set remote DMA write. */
498: NIC_BARRIER(nict, nich);
499: bus_space_write_1(nict, nich,
500: ED_P0_CR, ED_CR_RD1 | ED_CR_PAGE_0 | ED_CR_STA);
501: NIC_BARRIER(nict, nich);
502:
503: /*
504: * Transfer the mbuf chain to the NIC memory. NE2000 cards
505: * require that data be transferred as words, and only words,
506: * so that case requires some extra code to patch over odd-length
507: * mbufs.
508: */
509: if (nsc->sc_type == NE2000_TYPE_NE1000) {
510: /* NE1000s are easy. */
511: for (; m != 0; m = m->m_next) {
512: if (m->m_len) {
513: bus_space_write_multi_1(asict, asich,
514: NE2000_ASIC_DATA, mtod(m, u_int8_t *),
515: m->m_len);
516: }
517: }
518: } else {
519: /* NE2000s are a bit trickier. */
520: u_int8_t *data, savebyte[2];
521: int l, leftover;
522: #ifdef DIAGNOSTIC
523: u_int8_t *lim;
524: #endif
525: /* Start out with no leftover data. */
526: leftover = 0;
527: savebyte[0] = savebyte[1] = 0;
528:
529: for (; m != 0; m = m->m_next) {
530: l = m->m_len;
531: if (l == 0)
532: continue;
533: data = mtod(m, u_int8_t *);
534: #ifdef DIAGNOSTIC
535: lim = data + l;
536: #endif
537: while (l > 0) {
538: if (leftover) {
539: /*
540: * Data left over (from mbuf or
541: * realignment). Buffer the next
542: * byte, and write it and the
543: * leftover data out.
544: */
545: savebyte[1] = *data++;
546: l--;
547: bus_space_write_raw_multi_2(asict,
548: asich, NE2000_ASIC_DATA,
549: savebyte, 2);
550: leftover = 0;
551: } else if (ALIGNED_POINTER(data,
552: u_int16_t) == 0) {
553: /*
554: * Unaligned data; buffer the next
555: * byte.
556: */
557: savebyte[0] = *data++;
558: l--;
559: leftover = 1;
560: } else {
561: /*
562: * Aligned data; output contiguous
563: * words as much as we can, then
564: * buffer the remaining byte, if any.
565: */
566: leftover = l & 1;
567: l &= ~1;
568: bus_space_write_raw_multi_2(asict,
569: asich, NE2000_ASIC_DATA, data, l);
570: data += l;
571: if (leftover)
572: savebyte[0] = *data++;
573: l = 0;
574: }
575: }
576: if (l < 0)
577: panic("ne2000_write_mbuf: negative len");
578: #ifdef DIAGNOSTIC
579: if (data != lim)
580: panic("ne2000_write_mbuf: data != lim");
581: #endif
582: }
583: if (leftover) {
584: savebyte[1] = 0;
585: bus_space_write_raw_multi_2(asict, asich,
586: NE2000_ASIC_DATA, savebyte, 2);
587: }
588: }
589: NIC_BARRIER(nict, nich);
590:
591: /* AX88796 doesn't seem to have remote DMA complete */
592: if (sc->sc_flags & DP8390_NO_REMOTE_DMA_COMPLETE)
593: return (savelen);
594:
595: /*
596: * Wait for remote DMA to complete. This is necessary because on the
597: * transmit side, data is handled internally by the NIC in bursts, and
598: * we can't start another remote DMA until this one completes. Not
599: * waiting causes really bad things to happen - like the NIC wedging
600: * the bus.
601: */
602: while (((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RDC) !=
603: ED_ISR_RDC) && --maxwait) {
604: bus_space_read_1(nict, nich, ED_P0_CRDA1);
605: bus_space_read_1(nict, nich, ED_P0_CRDA0);
606: NIC_BARRIER(nict, nich);
607: DELAY(1);
608: }
609:
610: if (maxwait == 0) {
611: log(LOG_WARNING,
612: "%s: remote transmit DMA failed to complete\n",
613: sc->sc_dev.dv_xname);
614: dp8390_reset(sc);
615: }
616:
617: return (savelen);
618: }
619:
620: /*
621: * Given a source and destination address, copy 'amount' of a packet from
622: * the ring buffer into a linear destination buffer. Takes into account
623: * ring-wrap.
624: */
625: int
626: ne2000_ring_copy(struct dp8390_softc *sc, int src, caddr_t dst,
627: u_short amount)
628: {
629: struct ne2000_softc *nsc = (struct ne2000_softc *)sc;
630: bus_space_tag_t nict = sc->sc_regt;
631: bus_space_handle_t nich = sc->sc_regh;
632: bus_space_tag_t asict = nsc->sc_asict;
633: bus_space_handle_t asich = nsc->sc_asich;
634: u_short tmp_amount;
635: int useword = nsc->sc_useword;
636:
637: /* Does copy wrap to lower addr in ring buffer? */
638: if (src + amount > sc->mem_end) {
639: tmp_amount = sc->mem_end - src;
640:
641: /* Copy amount up to end of NIC memory. */
642: ne2000_readmem(nict, nich, asict, asich, src,
643: (u_int8_t *)dst, tmp_amount, useword);
644:
645: amount -= tmp_amount;
646: src = sc->mem_ring;
647: dst += tmp_amount;
648: }
649:
650: ne2000_readmem(nict, nich, asict, asich, src, (u_int8_t *)dst,
651: amount, useword);
652:
653: return (src + amount);
654: }
655:
656: void
657: ne2000_read_hdr(struct dp8390_softc *sc, int buf, struct dp8390_ring *hdr)
658: {
659: struct ne2000_softc *nsc = (struct ne2000_softc *)sc;
660:
661: ne2000_readmem(sc->sc_regt, sc->sc_regh, nsc->sc_asict, nsc->sc_asich,
662: buf, (u_int8_t *)hdr, sizeof(struct dp8390_ring),
663: nsc->sc_useword);
664: #if BYTE_ORDER == BIG_ENDIAN
665: hdr->count = swap16(hdr->count);
666: #endif
667: }
668:
669: int
670: ne2000_test_mem(struct dp8390_softc *sc)
671: {
672: /* Noop. */
673: return (0);
674: }
675:
676: /*
677: * Given a NIC memory source address and a host memory destination address,
678: * copy 'amount' from NIC to host using programmed i/o. The 'amount' is
679: * rounded up to a word - ok as long as mbufs are word sized.
680: */
681: void
682: ne2000_readmem(bus_space_tag_t nict, bus_space_handle_t nich,
683: bus_space_tag_t asict, bus_space_handle_t asich, int src,
684: u_int8_t *dst, size_t amount, int useword)
685: {
686:
687: /* Select page 0 registers. */
688: NIC_BARRIER(nict, nich);
689: bus_space_write_1(nict, nich, ED_P0_CR,
690: ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA);
691: NIC_BARRIER(nict, nich);
692:
693: /* Round up to a word. */
694: if (amount & 1)
695: ++amount;
696:
697: /* Set up DMA byte count. */
698: bus_space_write_1(nict, nich, ED_P0_RBCR0, amount);
699: bus_space_write_1(nict, nich, ED_P0_RBCR1, amount >> 8);
700:
701: /* Set up source address in NIC mem. */
702: bus_space_write_1(nict, nich, ED_P0_RSAR0, src);
703: bus_space_write_1(nict, nich, ED_P0_RSAR1, src >> 8);
704:
705: NIC_BARRIER(nict, nich);
706: bus_space_write_1(nict, nich, ED_P0_CR,
707: ED_CR_RD0 | ED_CR_PAGE_0 | ED_CR_STA);
708:
709: ASIC_BARRIER(asict, asich);
710: if (useword)
711: bus_space_read_raw_multi_2(asict, asich, NE2000_ASIC_DATA,
712: dst, amount);
713: else
714: bus_space_read_multi_1(asict, asich, NE2000_ASIC_DATA,
715: dst, amount);
716: }
717:
718: /*
719: * Stripped down routine for writing a linear buffer to NIC memory. Only
720: * used in the probe routine to test the memory. 'len' must be even.
721: */
722: void
723: ne2000_writemem(bus_space_tag_t nict, bus_space_handle_t nich,
724: bus_space_tag_t asict, bus_space_handle_t asich, u_int8_t *src,
725: int dst, size_t len, int useword)
726: {
727: int maxwait = 100; /* about 120us */
728:
729: /* Select page 0 registers. */
730: NIC_BARRIER(nict, nich);
731: bus_space_write_1(nict, nich, ED_P0_CR,
732: ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA);
733: NIC_BARRIER(nict, nich);
734:
735: /* Reset remote DMA complete flag. */
736: bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RDC);
737: NIC_BARRIER(nict, nich);
738:
739: /* Set up DMA byte count. */
740: bus_space_write_1(nict, nich, ED_P0_RBCR0, len);
741: bus_space_write_1(nict, nich, ED_P0_RBCR1, len >> 8);
742:
743: /* Set up destination address in NIC mem. */
744: bus_space_write_1(nict, nich, ED_P0_RSAR0, dst);
745: bus_space_write_1(nict, nich, ED_P0_RSAR1, dst >> 8);
746:
747: /* Set remote DMA write. */
748: NIC_BARRIER(nict, nich);
749: bus_space_write_1(nict, nich, ED_P0_CR,
750: ED_CR_RD1 | ED_CR_PAGE_0 | ED_CR_STA);
751: NIC_BARRIER(nict, nich);
752:
753: ASIC_BARRIER(asict, asich);
754: if (useword)
755: bus_space_write_raw_multi_2(asict, asich, NE2000_ASIC_DATA,
756: src, len);
757: else
758: bus_space_write_multi_1(asict, asich, NE2000_ASIC_DATA,
759: src, len);
760: ASIC_BARRIER(asict, asich);
761:
762: /*
763: * Wait for remote DMA to complete. This is necessary because on the
764: * transmit side, data is handled internally by the NIC in bursts, and
765: * we can't start another remote DMA until this one completes. Not
766: * waiting causes really bad things to happen - like the NIC wedging
767: * the bus.
768: */
769: while (((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RDC) !=
770: ED_ISR_RDC) && --maxwait)
771: DELAY(1);
772: }
773:
774: int
775: ne2000_detach(struct ne2000_softc *sc, int flags)
776: {
777: return (dp8390_detach(&sc->sc_dp8390, flags));
778: }
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