summaryrefslogtreecommitdiff
path: root/drivers/net/ne2000.c
blob: 36ea35b2c217df51d85406f692c15e80782f9497 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
/*
Ported to U-Boot  by Christian Pellegrin <chri@ascensit.com>

Based on sources from the Linux kernel (pcnet_cs.c, 8390.h) and
eCOS(if_dp83902a.c, if_dp83902a.h). Both of these 2 wonderful world
are GPL, so this is, of course, GPL.


==========================================================================

dev/if_dp83902a.c

Ethernet device driver for NS DP83902a ethernet controller

==========================================================================
####ECOSGPLCOPYRIGHTBEGIN####
-------------------------------------------
This file is part of eCos, the Embedded Configurable Operating System.
Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

eCos is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 or (at your option) any later version.

eCos is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with eCos; if not, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

As a special exception, if other files instantiate templates or use macros
or inline functions from this file, or you compile this file and link it
with other works to produce a work based on this file, this file does not
by itself cause the resulting work to be covered by the GNU General Public
License. However the source code for this file must still be made available
in accordance with section (3) of the GNU General Public License.

This exception does not invalidate any other reasons why a work based on
this file might be covered by the GNU General Public License.

Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
at http://sources.redhat.com/ecos/ecos-license/
-------------------------------------------
####ECOSGPLCOPYRIGHTEND####
####BSDCOPYRIGHTBEGIN####

-------------------------------------------

Portions of this software may have been derived from OpenBSD or other sources,
and are covered by the appropriate copyright disclaimers included herein.

-------------------------------------------

####BSDCOPYRIGHTEND####
==========================================================================
#####DESCRIPTIONBEGIN####

Author(s):    gthomas
Contributors: gthomas, jskov, rsandifo
Date:	      2001-06-13
Purpose:
Description:

FIXME:	      Will fail if pinged with large packets (1520 bytes)
Add promisc config
Add SNMP

####DESCRIPTIONEND####


==========================================================================

*/

#include <common.h>
#include <command.h>
#include <net.h>
#include <malloc.h>

#define mdelay(n)       udelay((n)*1000)
/* forward definition of function used for the uboot interface */
void uboot_push_packet_len(int len);
void uboot_push_tx_done(int key, int val);

/*
  ------------------------------------------------------------------------
  Debugging details

  Set to perms of:
  0 disables all debug output
  1 for process debug output
  2 for added data IO output: get_reg, put_reg
  4 for packet allocation/free output
  8 for only startup status, so we can tell we're installed OK
*/
/*#define DEBUG 0xf*/
#define DEBUG 0

#if DEBUG & 1
#define DEBUG_FUNCTION() do { printf("%s\n", __FUNCTION__); } while (0)
#define DEBUG_LINE() do { printf("%d\n", __LINE__); } while (0)
#define PRINTK(args...) printf(args)
#else
#define DEBUG_FUNCTION() do {} while(0)
#define DEBUG_LINE() do {} while(0)
#define PRINTK(args...)
#endif

/* NE2000 base header file */
#include "ne2000_base.h"

/* Basic NE2000 chip support */
#include "ne2000.h"

static dp83902a_priv_data_t nic; /* just one instance of the card supported */

static bool
dp83902a_init(void)
{
	dp83902a_priv_data_t *dp = &nic;
	u8* base;

	DEBUG_FUNCTION();

	base = dp->base;
	if (!base) return false;  /* No device found */

	DEBUG_LINE();

#if defined(NE2000_BASIC_INIT)
	/* Prepare ESA */
	DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE1);  /* Select page 1 */
	/* Use the address from the serial EEPROM */
	for (i = 0; i < 6; i++)
		DP_IN(base, DP_P1_PAR0+i, dp->esa[i]);
	DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE0);  /* Select page 0 */

	printf("NE2000 - %s ESA: %02x:%02x:%02x:%02x:%02x:%02x\n",
	       "eeprom",
	       dp->esa[0],
	       dp->esa[1],
	       dp->esa[2],
	       dp->esa[3],
	       dp->esa[4],
	       dp->esa[5] );

#endif	/* NE2000_BASIC_INIT */
	return true;
}

static void
dp83902a_stop(void)
{
	dp83902a_priv_data_t *dp = &nic;
	u8 *base = dp->base;

	DEBUG_FUNCTION();

	DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_STOP);  /* Brutal */
	DP_OUT(base, DP_ISR, 0xFF);		/* Clear any pending interrupts */
	DP_OUT(base, DP_IMR, 0x00);		/* Disable all interrupts */

	dp->running = false;
}

/*
  This function is called to "start up" the interface.  It may be called
  multiple times, even when the hardware is already running.  It will be
  called whenever something "hardware oriented" changes and should leave
  the hardware ready to send/receive packets.
*/
static void
dp83902a_start(u8 * enaddr)
{
	dp83902a_priv_data_t *dp = &nic;
	u8 *base = dp->base;
	int i;

	DEBUG_FUNCTION();

	DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_STOP); /* Brutal */
	DP_OUT(base, DP_DCR, DP_DCR_INIT);
	DP_OUT(base, DP_RBCH, 0);		/* Remote byte count */
	DP_OUT(base, DP_RBCL, 0);
	DP_OUT(base, DP_RCR, DP_RCR_MON);	/* Accept no packets */
	DP_OUT(base, DP_TCR, DP_TCR_LOCAL);	/* Transmitter [virtually] off */
	DP_OUT(base, DP_TPSR, dp->tx_buf1);	/* Transmitter start page */
	dp->tx1 = dp->tx2 = 0;
	dp->tx_next = dp->tx_buf1;
	dp->tx_started = false;
	dp->running = true;
	DP_OUT(base, DP_PSTART, dp->rx_buf_start); /* Receive ring start page */
	DP_OUT(base, DP_BNDRY, dp->rx_buf_end-1); /* Receive ring boundary */
	DP_OUT(base, DP_PSTOP, dp->rx_buf_end);	/* Receive ring end page */
	dp->rx_next = dp->rx_buf_start-1;
	dp->running = true;
	DP_OUT(base, DP_ISR, 0xFF);		/* Clear any pending interrupts */
	DP_OUT(base, DP_IMR, DP_IMR_All);	/* Enable all interrupts */
	DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE1 | DP_CR_STOP);  /* Select page 1 */
	DP_OUT(base, DP_P1_CURP, dp->rx_buf_start);   /* Current page - next free page for Rx */
	dp->running = true;
	for (i = 0;  i < ETHER_ADDR_LEN;  i++) {
		/* FIXME */
		//*((vu_short*)( base + ((DP_P1_PAR0 + i) * 2) +  0x1400)) = enaddr[i];
		DP_OUT(base, DP_P1_PAR0+i, enaddr[i]);
	}
	/* Enable and start device */
	DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START);
	DP_OUT(base, DP_TCR, DP_TCR_NORMAL); /* Normal transmit operations */
	DP_OUT(base, DP_RCR, DP_RCR_AB);  /* Accept broadcast, no errors, no multicast */
	dp->running = true;

}

/*
  This routine is called to start the transmitter.  It is split out from the
  data handling routine so it may be called either when data becomes first
  available or when an Tx interrupt occurs
*/

static void
dp83902a_start_xmit(int start_page, int len)
{
	dp83902a_priv_data_t *dp = (dp83902a_priv_data_t *) &nic;
	u8 *base = dp->base;

	DEBUG_FUNCTION();

#if DEBUG & 1
	printf("Tx pkt %d len %d\n", start_page, len);
	if (dp->tx_started)
		printf("TX already started?!?\n");
#endif

	DP_OUT(base, DP_ISR, (DP_ISR_TxP | DP_ISR_TxE));
	DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START);
	DP_OUT(base, DP_TBCL, len & 0xFF);
	DP_OUT(base, DP_TBCH, len >> 8);
	DP_OUT(base, DP_TPSR, start_page);
	DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_TXPKT | DP_CR_START);

	dp->tx_started = true;
}

/*
  This routine is called to send data to the hardware.  It is known a-priori
  that there is free buffer space (dp->tx_next).
*/
static void
dp83902a_send(u8 *data, int total_len, u32 key)
{
	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
	u8 *base = dp->base;
	int len, start_page, pkt_len, i, isr;
#if DEBUG & 4
	int dx;
#endif

	DEBUG_FUNCTION();

	len = pkt_len = total_len;
	if (pkt_len < IEEE_8023_MIN_FRAME) pkt_len = IEEE_8023_MIN_FRAME;

	start_page = dp->tx_next;
	if (dp->tx_next == dp->tx_buf1) {
		dp->tx1 = start_page;
		dp->tx1_len = pkt_len;
		dp->tx1_key = key;
		dp->tx_next = dp->tx_buf2;
	} else {
		dp->tx2 = start_page;
		dp->tx2_len = pkt_len;
		dp->tx2_key = key;
		dp->tx_next = dp->tx_buf1;
	}

#if DEBUG & 5
	printf("TX prep page %d len %d\n", start_page, pkt_len);
#endif

	DP_OUT(base, DP_ISR, DP_ISR_RDC);  /* Clear end of DMA */
	{
		/* Dummy read. The manual sez something slightly different, */
		/* but the code is extended a bit to do what Hitachi's monitor */
		/* does (i.e., also read data). */

		u16 tmp;
		int len = 1;

		DP_OUT(base, DP_RSAL, 0x100-len);
		DP_OUT(base, DP_RSAH, (start_page-1) & 0xff);
		DP_OUT(base, DP_RBCL, len);
		DP_OUT(base, DP_RBCH, 0);
		DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_RDMA | DP_CR_START);
		DP_IN_DATA(dp->data, tmp);
	}

#ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_TX_DMA
	/* Stall for a bit before continuing to work around random data */
	/* corruption problems on some platforms. */
	CYGACC_CALL_IF_DELAY_US(1);
#endif

	/* Send data to device buffer(s) */
	DP_OUT(base, DP_RSAL, 0);
	DP_OUT(base, DP_RSAH, start_page);
	DP_OUT(base, DP_RBCL, pkt_len & 0xFF);
	DP_OUT(base, DP_RBCH, pkt_len >> 8);
	DP_OUT(base, DP_CR, DP_CR_WDMA | DP_CR_START);

	/* Put data into buffer */
#if DEBUG & 4
	printf(" sg buf %08lx len %08x\n ", (u32)data, len);
	dx = 0;
#endif
	while (len > 0) {
#if DEBUG & 4
		printf(" %02x", *data);
		if (0 == (++dx % 16)) printf("\n ");
#endif

		DP_OUT_DATA(dp->data, *data++);
		len--;
	}
#if DEBUG & 4
	printf("\n");
#endif
	if (total_len < pkt_len) {
#if DEBUG & 4
		printf("  + %d bytes of padding\n", pkt_len - total_len);
#endif
		/* Padding to 802.3 length was required */
		for (i = total_len;  i < pkt_len;) {
			i++;
			DP_OUT_DATA(dp->data, 0);
		}
	}

#ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_TX_DMA
	/* After last data write, delay for a bit before accessing the */
	/* device again, or we may get random data corruption in the last */
	/* datum (on some platforms). */
	CYGACC_CALL_IF_DELAY_US(1);
#endif

	/* Wait for DMA to complete */
	do {
		DP_IN(base, DP_ISR, isr);
	} while ((isr & DP_ISR_RDC) == 0);

	/* Then disable DMA */
	DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START);

	/* Start transmit if not already going */
	if (!dp->tx_started) {
		if (start_page == dp->tx1) {
			dp->tx_int = 1;  /* Expecting interrupt from BUF1 */
		} else {
			dp->tx_int = 2;  /* Expecting interrupt from BUF2 */
		}
		dp83902a_start_xmit(start_page, pkt_len);
	}
}

/*
  This function is called when a packet has been received.  It's job is
  to prepare to unload the packet from the hardware.  Once the length of
  the packet is known, the upper layer of the driver can be told.  When
  the upper layer is ready to unload the packet, the internal function
  'dp83902a_recv' will be called to actually fetch it from the hardware.
*/
static void
dp83902a_RxEvent(void)
{
	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
	u8 *base = dp->base;
	u8 rsr;
	u8 rcv_hdr[4];
	int i, len, pkt, cur;

	DEBUG_FUNCTION();

	DP_IN(base, DP_RSR, rsr);
	while (true) {
		/* Read incoming packet header */
		DP_OUT(base, DP_CR, DP_CR_PAGE1 | DP_CR_NODMA | DP_CR_START);
		DP_IN(base, DP_P1_CURP, cur);
		DP_OUT(base, DP_P1_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START);
		DP_IN(base, DP_BNDRY, pkt);

		pkt += 1;
		if (pkt == dp->rx_buf_end)
			pkt = dp->rx_buf_start;

		if (pkt == cur) {
			break;
		}
		DP_OUT(base, DP_RBCL, sizeof(rcv_hdr));
		DP_OUT(base, DP_RBCH, 0);
		DP_OUT(base, DP_RSAL, 0);
		DP_OUT(base, DP_RSAH, pkt);
		if (dp->rx_next == pkt) {
			if (cur == dp->rx_buf_start)
				DP_OUT(base, DP_BNDRY, dp->rx_buf_end-1);
			else
				DP_OUT(base, DP_BNDRY, cur-1); /* Update pointer */
			return;
		}
		dp->rx_next = pkt;
		DP_OUT(base, DP_ISR, DP_ISR_RDC); /* Clear end of DMA */
		DP_OUT(base, DP_CR, DP_CR_RDMA | DP_CR_START);
#ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_RX_DMA
		CYGACC_CALL_IF_DELAY_US(10);
#endif

		/* read header (get data size)*/
		for (i = 0;  i < sizeof(rcv_hdr);) {
			DP_IN_DATA(dp->data, rcv_hdr[i++]);
		}

#if DEBUG & 5
		printf("rx hdr %02x %02x %02x %02x\n",
		       rcv_hdr[0], rcv_hdr[1], rcv_hdr[2], rcv_hdr[3]);
#endif
		len = ((rcv_hdr[3] << 8) | rcv_hdr[2]) - sizeof(rcv_hdr);

		/* data read */
		uboot_push_packet_len(len);

		if (rcv_hdr[1] == dp->rx_buf_start)
			DP_OUT(base, DP_BNDRY, dp->rx_buf_end-1);
		else
			DP_OUT(base, DP_BNDRY, rcv_hdr[1]-1); /* Update pointer */
	}
}

/*
  This function is called as a result of the "eth_drv_recv()" call above.
  It's job is to actually fetch data for a packet from the hardware once
  memory buffers have been allocated for the packet.  Note that the buffers
  may come in pieces, using a scatter-gather list.  This allows for more
  efficient processing in the upper layers of the stack.
*/
static void
dp83902a_recv(u8 *data, int len)
{
	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
	u8 *base = dp->base;
	int i, mlen;
	u8 saved_char = 0;
	bool saved;
#if DEBUG & 4
	int dx;
#endif

	DEBUG_FUNCTION();

#if DEBUG & 5
	printf("Rx packet %d length %d\n", dp->rx_next, len);
#endif

	/* Read incoming packet data */
	DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START);
	DP_OUT(base, DP_RBCL, len & 0xFF);
	DP_OUT(base, DP_RBCH, len >> 8);
	DP_OUT(base, DP_RSAL, 4);		/* Past header */
	DP_OUT(base, DP_RSAH, dp->rx_next);
	DP_OUT(base, DP_ISR, DP_ISR_RDC); /* Clear end of DMA */
	DP_OUT(base, DP_CR, DP_CR_RDMA | DP_CR_START);
#ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_RX_DMA
	CYGACC_CALL_IF_DELAY_US(10);
#endif

	saved = false;
	for (i = 0;  i < 1;  i++) {
		if (data) {
			mlen = len;
#if DEBUG & 4
			printf(" sg buf %08lx len %08x \n", (u32) data, mlen);
			dx = 0;
#endif
			while (0 < mlen) {
				/* Saved byte from previous loop? */
				if (saved) {
					*data++ = saved_char;
					mlen--;
					saved = false;
					continue;
				}

				{
					u8 tmp;
					DP_IN_DATA(dp->data, tmp);
#if DEBUG & 4
					printf(" %02x", tmp);
					if (0 == (++dx % 16)) printf("\n ");
#endif
					*data++ = tmp;;
					mlen--;
				}
			}
#if DEBUG & 4
			printf("\n");
#endif
		}
	}
}

static void
dp83902a_TxEvent(void)
{
	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
	u8 *base = dp->base;
	u8 tsr;
	u32 key;

	DEBUG_FUNCTION();

	DP_IN(base, DP_TSR, tsr);
	if (dp->tx_int == 1) {
		key = dp->tx1_key;
		dp->tx1 = 0;
	} else {
		key = dp->tx2_key;
		dp->tx2 = 0;
	}
	/* Start next packet if one is ready */
	dp->tx_started = false;
	if (dp->tx1) {
		dp83902a_start_xmit(dp->tx1, dp->tx1_len);
		dp->tx_int = 1;
	} else if (dp->tx2) {
		dp83902a_start_xmit(dp->tx2, dp->tx2_len);
		dp->tx_int = 2;
	} else {
		dp->tx_int = 0;
	}
	/* Tell higher level we sent this packet */
	uboot_push_tx_done(key, 0);
}

/* Read the tally counters to clear them.  Called in response to a CNT */
/* interrupt. */
static void
dp83902a_ClearCounters(void)
{
	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
	u8 *base = dp->base;
	u8 cnt1, cnt2, cnt3;

	DP_IN(base, DP_FER, cnt1);
	DP_IN(base, DP_CER, cnt2);
	DP_IN(base, DP_MISSED, cnt3);
	DP_OUT(base, DP_ISR, DP_ISR_CNT);
}

/* Deal with an overflow condition.  This code follows the procedure set */
/* out in section 7.0 of the datasheet. */
static void
dp83902a_Overflow(void)
{
	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *)&nic;
	u8 *base = dp->base;
	u8 isr;

	/* Issue a stop command and wait 1.6ms for it to complete. */
	DP_OUT(base, DP_CR, DP_CR_STOP | DP_CR_NODMA);
	CYGACC_CALL_IF_DELAY_US(1600);

	/* Clear the remote byte counter registers. */
	DP_OUT(base, DP_RBCL, 0);
	DP_OUT(base, DP_RBCH, 0);

	/* Enter loopback mode while we clear the buffer. */
	DP_OUT(base, DP_TCR, DP_TCR_LOCAL);
	DP_OUT(base, DP_CR, DP_CR_START | DP_CR_NODMA);

	/* Read in as many packets as we can and acknowledge any and receive */
	/* interrupts.  Since the buffer has overflowed, a receive event of */
	/* some kind will have occured. */
	dp83902a_RxEvent();
	DP_OUT(base, DP_ISR, DP_ISR_RxP|DP_ISR_RxE);

	/* Clear the overflow condition and leave loopback mode. */
	DP_OUT(base, DP_ISR, DP_ISR_OFLW);
	DP_OUT(base, DP_TCR, DP_TCR_NORMAL);

	/* If a transmit command was issued, but no transmit event has occured, */
	/* restart it here. */
	DP_IN(base, DP_ISR, isr);
	if (dp->tx_started && !(isr & (DP_ISR_TxP|DP_ISR_TxE))) {
		DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_TXPKT | DP_CR_START);
	}
}

static void
dp83902a_poll(void)
{
	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
	u8 *base = dp->base;
	u8 isr;

	DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE0 | DP_CR_START);
	DP_IN(base, DP_ISR, isr);
	while (0 != isr) {
		/* The CNT interrupt triggers when the MSB of one of the error */
		/* counters is set.  We don't much care about these counters, but */
		/* we should read their values to reset them. */
		if (isr & DP_ISR_CNT) {
			dp83902a_ClearCounters();
		}
		/* Check for overflow.  It's a special case, since there's a */
		/* particular procedure that must be followed to get back into */
		/* a running state.a */
		if (isr & DP_ISR_OFLW) {
			dp83902a_Overflow();
		} else {
			/* Other kinds of interrupts can be acknowledged simply by */
			/* clearing the relevant bits of the ISR.  Do that now, then */
			/* handle the interrupts we care about. */
			DP_OUT(base, DP_ISR, isr);      /* Clear set bits */
			if (!dp->running) break;	/* Is this necessary? */
			/* Check for tx_started on TX event since these may happen */
			/* spuriously it seems. */
			if (isr & (DP_ISR_TxP|DP_ISR_TxE) && dp->tx_started) {
				dp83902a_TxEvent();
			}
			if (isr & (DP_ISR_RxP|DP_ISR_RxE)) {
				dp83902a_RxEvent();
			}
		}
		DP_IN(base, DP_ISR, isr);
	}
}

/* find prom (taken from pc_net_cs.c from Linux) */

#include "8390.h"
/*
typedef struct hw_info_t {
	u_int	offset;
	u_char	a0, a1, a2;
	u_int	flags;
} hw_info_t;
*/
#define DELAY_OUTPUT	0x01
#define HAS_MISC_REG	0x02
#define USE_BIG_BUF	0x04
#define HAS_IBM_MISC	0x08
#define IS_DL10019	0x10
#define IS_DL10022	0x20
#define HAS_MII		0x40
#define USE_SHMEM	0x80	/* autodetected */

#define AM79C9XX_HOME_PHY	0x00006B90  /* HomePNA PHY */
#define AM79C9XX_ETH_PHY	0x00006B70  /* 10baseT PHY */
#define MII_PHYID_REV_MASK	0xfffffff0
#define MII_PHYID_REG1		0x02
#define MII_PHYID_REG2		0x03

static hw_info_t hw_info[] = {
	{ /* Accton EN2212 */ 0x0ff0, 0x00, 0x00, 0xe8, DELAY_OUTPUT },
	{ /* Allied Telesis LA-PCM */ 0x0ff0, 0x00, 0x00, 0xf4, 0 },
	{ /* APEX MultiCard */ 0x03f4, 0x00, 0x20, 0xe5, 0 },
	{ /* ASANTE FriendlyNet */ 0x4910, 0x00, 0x00, 0x94,
	  DELAY_OUTPUT | HAS_IBM_MISC },
	{ /* Danpex EN-6200P2 */ 0x0110, 0x00, 0x40, 0xc7, 0 },
	{ /* DataTrek NetCard */ 0x0ff0, 0x00, 0x20, 0xe8, 0 },
	{ /* Dayna CommuniCard E */ 0x0110, 0x00, 0x80, 0x19, 0 },
	{ /* D-Link DE-650 */ 0x0040, 0x00, 0x80, 0xc8, 0 },
	{ /* EP-210 Ethernet */ 0x0110, 0x00, 0x40, 0x33, 0 },
	{ /* EP4000 Ethernet */ 0x01c0, 0x00, 0x00, 0xb4, 0 },
	{ /* Epson EEN10B */ 0x0ff0, 0x00, 0x00, 0x48,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* ELECOM Laneed LD-CDWA */ 0xb8, 0x08, 0x00, 0x42, 0 },
	{ /* Hypertec Ethernet */ 0x01c0, 0x00, 0x40, 0x4c, 0 },
	{ /* IBM CCAE */ 0x0ff0, 0x08, 0x00, 0x5a,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* IBM CCAE */ 0x0ff0, 0x00, 0x04, 0xac,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* IBM CCAE */ 0x0ff0, 0x00, 0x06, 0x29,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* IBM FME */ 0x0374, 0x08, 0x00, 0x5a,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* IBM FME */ 0x0374, 0x00, 0x04, 0xac,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* Kansai KLA-PCM/T */ 0x0ff0, 0x00, 0x60, 0x87,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* NSC DP83903 */ 0x0374, 0x08, 0x00, 0x17,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* NSC DP83903 */ 0x0374, 0x00, 0xc0, 0xa8,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* NSC DP83903 */ 0x0374, 0x00, 0xa0, 0xb0,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* NSC DP83903 */ 0x0198, 0x00, 0x20, 0xe0,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* I-O DATA PCLA/T */ 0x0ff0, 0x00, 0xa0, 0xb0, 0 },
	{ /* Katron PE-520 */ 0x0110, 0x00, 0x40, 0xf6, 0 },
	{ /* Kingston KNE-PCM/x */ 0x0ff0, 0x00, 0xc0, 0xf0,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* Kingston KNE-PCM/x */ 0x0ff0, 0xe2, 0x0c, 0x0f,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* Kingston KNE-PC2 */ 0x0180, 0x00, 0xc0, 0xf0, 0 },
	{ /* Maxtech PCN2000 */ 0x5000, 0x00, 0x00, 0xe8, 0 },
	{ /* NDC Instant-Link */ 0x003a, 0x00, 0x80, 0xc6, 0 },
	{ /* NE2000 Compatible */ 0x0ff0, 0x00, 0xa0, 0x0c, 0 },
	{ /* Network General Sniffer */ 0x0ff0, 0x00, 0x00, 0x65,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* Panasonic VEL211 */ 0x0ff0, 0x00, 0x80, 0x45,
	  HAS_MISC_REG | HAS_IBM_MISC },
	{ /* PreMax PE-200 */ 0x07f0, 0x00, 0x20, 0xe0, 0 },
	{ /* RPTI EP400 */ 0x0110, 0x00, 0x40, 0x95, 0 },
	{ /* SCM Ethernet */ 0x0ff0, 0x00, 0x20, 0xcb, 0 },
	{ /* Socket EA */ 0x4000, 0x00, 0xc0, 0x1b,
	  DELAY_OUTPUT | HAS_MISC_REG | USE_BIG_BUF },
	{ /* Socket LP-E CF+ */ 0x01c0, 0x00, 0xc0, 0x1b, 0 },
	{ /* SuperSocket RE450T */ 0x0110, 0x00, 0xe0, 0x98, 0 },
	{ /* Volktek NPL-402CT */ 0x0060, 0x00, 0x40, 0x05, 0 },
	{ /* NEC PC-9801N-J12 */ 0x0ff0, 0x00, 0x00, 0x4c, 0 },
	{ /* PCMCIA Technology OEM */ 0x01c8, 0x00, 0xa0, 0x0c, 0 },
	{ /* Qemu */ 0x0, 0x52, 0x54, 0x00, 0 }
};

#define NR_INFO		(sizeof(hw_info)/sizeof(hw_info_t))

static hw_info_t default_info = { 0, 0, 0, 0, 0 };

u8 dev_addr[6];

#define PCNET_CMD	0x00
#define PCNET_DATAPORT	0x10	/* NatSemi-defined port window offset. */
#define PCNET_RESET	0x1f	/* Issue a read to reset, a write to clear. */
#define PCNET_MISC	0x18	/* For IBM CCAE and Socket EA cards */

u32 nic_base;

/* U-boot specific routines */
static u8 *pbuf = NULL;

static int pkey = -1;
static int initialized=0;

void uboot_push_packet_len(int len) {
	PRINTK("pushed len = %d\n", len);
	if (len>=2000) {
		printf("NE2000: packet too big\n");
		return;
	}
	dp83902a_recv(&pbuf[0], len);

	/*Just pass it to the upper layer*/
	NetReceive(&pbuf[0], len);
}

void uboot_push_tx_done(int key, int val) {
	PRINTK("pushed key = %d\n", key);
	pkey = key;
}

int eth_init(bd_t *bd) {
	static hw_info_t * r;
	char ethaddr[20];

	PRINTK("### eth_init\n");

	if (!pbuf) {
		pbuf = malloc(2000);
		if (!pbuf) {
			printf("Cannot allocate rx buffer\n");
			return -1;
		}
	}

#ifdef CONFIG_DRIVER_NE2000_CCR
	{
		vu_char *p =  (vu_char *) CONFIG_DRIVER_NE2000_CCR;

		PRINTK("CCR before is %x\n", *p);
		*p = CONFIG_DRIVER_NE2000_VAL;
		PRINTK("CCR after is %x\n", *p);
	}
#endif

	nic_base = CONFIG_DRIVER_NE2000_BASE;
	nic.base = (u8 *) CONFIG_DRIVER_NE2000_BASE;

	r = get_prom(dev_addr);
	if (!r)
		return -1;

	sprintf (ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
		 dev_addr[0], dev_addr[1],
		 dev_addr[2], dev_addr[3],
		 dev_addr[4], dev_addr[5]) ;
	PRINTK("Set environment from HW MAC addr = \"%s\"\n", ethaddr);
	setenv ("ethaddr", ethaddr);

	nic.data = nic.base + DP_DATA;
	nic.tx_buf1 = START_PG;
	nic.tx_buf2 = START_PG2;
	nic.rx_buf_start = RX_START;
	nic.rx_buf_end = RX_END;

	if (dp83902a_init() == false)
		return -1;

	dp83902a_start(dev_addr);
	initialized=1;

	return 0;
}

void eth_halt() {

	PRINTK("### eth_halt\n");
	if(initialized)
		dp83902a_stop();
	initialized=0;
}

int eth_rx() {
	dp83902a_poll();
	return 1;
}

int eth_send(volatile void *packet, int length) {
	int tmo;

	PRINTK("### eth_send\n");

	pkey = -1;

	dp83902a_send((u8 *) packet, length, 666);
	tmo = get_timer (0) + TOUT * CFG_HZ;
	while(1) {
		dp83902a_poll();
		if (pkey != -1) {
			PRINTK("Packet sucesfully sent\n");
			return 0;
		}
		if (get_timer (0) >= tmo) {
			printf("transmission error (timoeut)\n");
			return 0;
		}

	}
	return 0;
}