Free Electrons

Embedded Linux Experts

  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
/*
 * Amiga Linux/68k A2065 Ethernet Driver
 *
 * (C) Copyright 1995-2003 by Geert Uytterhoeven <geert@linux-m68k.org>
 *
 * Fixes and tips by:
 *	- Janos Farkas (CHEXUM@sparta.banki.hu)
 *	- Jes Degn Soerensen (jds@kom.auc.dk)
 *	- Matt Domsch (Matt_Domsch@dell.com)
 *
 * ----------------------------------------------------------------------------
 *
 * This program is based on
 *
 *	ariadne.?:	Amiga Linux/68k Ariadne Ethernet Driver
 *			(C) Copyright 1995 by Geert Uytterhoeven,
 *                                            Peter De Schrijver
 *
 *	lance.c:	An AMD LANCE ethernet driver for linux.
 *			Written 1993-94 by Donald Becker.
 *
 *	Am79C960:	PCnet(tm)-ISA Single-Chip Ethernet Controller
 *			Advanced Micro Devices
 *			Publication #16907, Rev. B, Amendment/0, May 1994
 *
 * ----------------------------------------------------------------------------
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of the Linux
 * distribution for more details.
 *
 * ----------------------------------------------------------------------------
 *
 * The A2065 is a Zorro-II board made by Commodore/Ameristar. It contains:
 *
 *	- an Am7990 Local Area Network Controller for Ethernet (LANCE) with
 *	  both 10BASE-2 (thin coax) and AUI (DB-15) connectors
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

/*#define DEBUG*/
/*#define TEST_HITS*/

#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/skbuff.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/crc32.h>
#include <linux/zorro.h>
#include <linux/bitops.h>

#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>

#include "a2065.h"

/* Transmit/Receive Ring Definitions */

#define LANCE_LOG_TX_BUFFERS	(2)
#define LANCE_LOG_RX_BUFFERS	(4)

#define TX_RING_SIZE		(1 << LANCE_LOG_TX_BUFFERS)
#define RX_RING_SIZE		(1 << LANCE_LOG_RX_BUFFERS)

#define TX_RING_MOD_MASK	(TX_RING_SIZE - 1)
#define RX_RING_MOD_MASK	(RX_RING_SIZE - 1)

#define PKT_BUF_SIZE		(1544)
#define RX_BUFF_SIZE            PKT_BUF_SIZE
#define TX_BUFF_SIZE            PKT_BUF_SIZE

/* Layout of the Lance's RAM Buffer */

struct lance_init_block {
	unsigned short mode;		/* Pre-set mode (reg. 15) */
	unsigned char phys_addr[6];     /* Physical ethernet address */
	unsigned filter[2];		/* Multicast filter. */

	/* Receive and transmit ring base, along with extra bits. */
	unsigned short rx_ptr;		/* receive descriptor addr */
	unsigned short rx_len;		/* receive len and high addr */
	unsigned short tx_ptr;		/* transmit descriptor addr */
	unsigned short tx_len;		/* transmit len and high addr */

	/* The Tx and Rx ring entries must aligned on 8-byte boundaries. */
	struct lance_rx_desc brx_ring[RX_RING_SIZE];
	struct lance_tx_desc btx_ring[TX_RING_SIZE];

	char rx_buf[RX_RING_SIZE][RX_BUFF_SIZE];
	char tx_buf[TX_RING_SIZE][TX_BUFF_SIZE];
};

/* Private Device Data */

struct lance_private {
	char *name;
	volatile struct lance_regs *ll;
	volatile struct lance_init_block *init_block;	    /* Hosts view */
	volatile struct lance_init_block *lance_init_block; /* Lance view */

	int rx_new, tx_new;
	int rx_old, tx_old;

	int lance_log_rx_bufs, lance_log_tx_bufs;
	int rx_ring_mod_mask, tx_ring_mod_mask;

	int tpe;		      /* cable-selection is TPE */
	int auto_select;	      /* cable-selection by carrier */
	unsigned short busmaster_regval;

#ifdef CONFIG_SUNLANCE
	struct Linux_SBus_DMA *ledma; /* if set this points to ledma and arch=4m */
	int burst_sizes;	      /* ledma SBus burst sizes */
#endif
	struct timer_list         multicast_timer;
};

#define LANCE_ADDR(x) ((int)(x) & ~0xff000000)

/* Load the CSR registers */
static void load_csrs(struct lance_private *lp)
{
	volatile struct lance_regs *ll = lp->ll;
	volatile struct lance_init_block *aib = lp->lance_init_block;
	int leptr = LANCE_ADDR(aib);

	ll->rap = LE_CSR1;
	ll->rdp = (leptr & 0xFFFF);
	ll->rap = LE_CSR2;
	ll->rdp = leptr >> 16;
	ll->rap = LE_CSR3;
	ll->rdp = lp->busmaster_regval;

	/* Point back to csr0 */
	ll->rap = LE_CSR0;
}

/* Setup the Lance Rx and Tx rings */
static void lance_init_ring(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_init_block *ib = lp->init_block;
	volatile struct lance_init_block *aib = lp->lance_init_block;
					/* for LANCE_ADDR computations */
	int leptr;
	int i;

	/* Lock out other processes while setting up hardware */
	netif_stop_queue(dev);
	lp->rx_new = lp->tx_new = 0;
	lp->rx_old = lp->tx_old = 0;

	ib->mode = 0;

	/* Copy the ethernet address to the lance init block
	 * Note that on the sparc you need to swap the ethernet address.
	 */
	ib->phys_addr[0] = dev->dev_addr[1];
	ib->phys_addr[1] = dev->dev_addr[0];
	ib->phys_addr[2] = dev->dev_addr[3];
	ib->phys_addr[3] = dev->dev_addr[2];
	ib->phys_addr[4] = dev->dev_addr[5];
	ib->phys_addr[5] = dev->dev_addr[4];

	/* Setup the Tx ring entries */
	netdev_dbg(dev, "TX rings:\n");
	for (i = 0; i <= 1 << lp->lance_log_tx_bufs; i++) {
		leptr = LANCE_ADDR(&aib->tx_buf[i][0]);
		ib->btx_ring[i].tmd0      = leptr;
		ib->btx_ring[i].tmd1_hadr = leptr >> 16;
		ib->btx_ring[i].tmd1_bits = 0;
		ib->btx_ring[i].length    = 0xf000; /* The ones required by tmd2 */
		ib->btx_ring[i].misc      = 0;
		if (i < 3)
			netdev_dbg(dev, "%d: 0x%08x\n", i, leptr);
	}

	/* Setup the Rx ring entries */
	netdev_dbg(dev, "RX rings:\n");
	for (i = 0; i < 1 << lp->lance_log_rx_bufs; i++) {
		leptr = LANCE_ADDR(&aib->rx_buf[i][0]);

		ib->brx_ring[i].rmd0      = leptr;
		ib->brx_ring[i].rmd1_hadr = leptr >> 16;
		ib->brx_ring[i].rmd1_bits = LE_R1_OWN;
		ib->brx_ring[i].length    = -RX_BUFF_SIZE | 0xf000;
		ib->brx_ring[i].mblength  = 0;
		if (i < 3)
			netdev_dbg(dev, "%d: 0x%08x\n", i, leptr);
	}

	/* Setup the initialization block */

	/* Setup rx descriptor pointer */
	leptr = LANCE_ADDR(&aib->brx_ring);
	ib->rx_len = (lp->lance_log_rx_bufs << 13) | (leptr >> 16);
	ib->rx_ptr = leptr;
	netdev_dbg(dev, "RX ptr: %08x\n", leptr);

	/* Setup tx descriptor pointer */
	leptr = LANCE_ADDR(&aib->btx_ring);
	ib->tx_len = (lp->lance_log_tx_bufs << 13) | (leptr >> 16);
	ib->tx_ptr = leptr;
	netdev_dbg(dev, "TX ptr: %08x\n", leptr);

	/* Clear the multicast filter */
	ib->filter[0] = 0;
	ib->filter[1] = 0;
}

static int init_restart_lance(struct lance_private *lp)
{
	volatile struct lance_regs *ll = lp->ll;
	int i;

	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_INIT;

	/* Wait for the lance to complete initialization */
	for (i = 0; (i < 100) && !(ll->rdp & (LE_C0_ERR | LE_C0_IDON)); i++)
		barrier();
	if ((i == 100) || (ll->rdp & LE_C0_ERR)) {
		pr_err("unopened after %d ticks, csr0=%04x\n", i, ll->rdp);
		return -EIO;
	}

	/* Clear IDON by writing a "1", enable interrupts and start lance */
	ll->rdp = LE_C0_IDON;
	ll->rdp = LE_C0_INEA | LE_C0_STRT;

	return 0;
}

static int lance_rx(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_init_block *ib = lp->init_block;
	volatile struct lance_regs *ll = lp->ll;
	volatile struct lance_rx_desc *rd;
	unsigned char bits;

#ifdef TEST_HITS
	int i;
	char buf[RX_RING_SIZE + 1];

	for (i = 0; i < RX_RING_SIZE; i++) {
		char r1_own = ib->brx_ring[i].rmd1_bits & LE_R1_OWN;
		if (i == lp->rx_new)
			buf[i] = r1_own ? '_' : 'X';
		else
			buf[i] = r1_own ? '.' : '1';
	}
	buf[RX_RING_SIZE] = 0;

	pr_debug("RxRing TestHits: [%s]\n", buf);
#endif

	ll->rdp = LE_C0_RINT | LE_C0_INEA;
	for (rd = &ib->brx_ring[lp->rx_new];
	     !((bits = rd->rmd1_bits) & LE_R1_OWN);
	     rd = &ib->brx_ring[lp->rx_new]) {

		/* We got an incomplete frame? */
		if ((bits & LE_R1_POK) != LE_R1_POK) {
			dev->stats.rx_over_errors++;
			dev->stats.rx_errors++;
			continue;
		} else if (bits & LE_R1_ERR) {
			/* Count only the end frame as a rx error,
			 * not the beginning
			 */
			if (bits & LE_R1_BUF)
				dev->stats.rx_fifo_errors++;
			if (bits & LE_R1_CRC)
				dev->stats.rx_crc_errors++;
			if (bits & LE_R1_OFL)
				dev->stats.rx_over_errors++;
			if (bits & LE_R1_FRA)
				dev->stats.rx_frame_errors++;
			if (bits & LE_R1_EOP)
				dev->stats.rx_errors++;
		} else {
			int len = (rd->mblength & 0xfff) - 4;
			struct sk_buff *skb = netdev_alloc_skb(dev, len + 2);

			if (!skb) {
				dev->stats.rx_dropped++;
				rd->mblength = 0;
				rd->rmd1_bits = LE_R1_OWN;
				lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
				return 0;
			}

			skb_reserve(skb, 2);		/* 16 byte align */
			skb_put(skb, len);		/* make room */
			skb_copy_to_linear_data(skb,
				 (unsigned char *)&ib->rx_buf[lp->rx_new][0],
				 len);
			skb->protocol = eth_type_trans(skb, dev);
			netif_rx(skb);
			dev->stats.rx_packets++;
			dev->stats.rx_bytes += len;
		}

		/* Return the packet to the pool */
		rd->mblength = 0;
		rd->rmd1_bits = LE_R1_OWN;
		lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
	}
	return 0;
}

static int lance_tx(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_init_block *ib = lp->init_block;
	volatile struct lance_regs *ll = lp->ll;
	volatile struct lance_tx_desc *td;
	int i, j;
	int status;

	/* csr0 is 2f3 */
	ll->rdp = LE_C0_TINT | LE_C0_INEA;
	/* csr0 is 73 */

	j = lp->tx_old;
	for (i = j; i != lp->tx_new; i = j) {
		td = &ib->btx_ring[i];

		/* If we hit a packet not owned by us, stop */
		if (td->tmd1_bits & LE_T1_OWN)
			break;

		if (td->tmd1_bits & LE_T1_ERR) {
			status = td->misc;

			dev->stats.tx_errors++;
			if (status & LE_T3_RTY)
				dev->stats.tx_aborted_errors++;
			if (status & LE_T3_LCOL)
				dev->stats.tx_window_errors++;

			if (status & LE_T3_CLOS) {
				dev->stats.tx_carrier_errors++;
				if (lp->auto_select) {
					lp->tpe = 1 - lp->tpe;
					netdev_err(dev, "Carrier Lost, trying %s\n",
						   lp->tpe ? "TPE" : "AUI");
					/* Stop the lance */
					ll->rap = LE_CSR0;
					ll->rdp = LE_C0_STOP;
					lance_init_ring(dev);
					load_csrs(lp);
					init_restart_lance(lp);
					return 0;
				}
			}

			/* buffer errors and underflows turn off
			 * the transmitter, so restart the adapter
			 */
			if (status & (LE_T3_BUF | LE_T3_UFL)) {
				dev->stats.tx_fifo_errors++;

				netdev_err(dev, "Tx: ERR_BUF|ERR_UFL, restarting\n");
				/* Stop the lance */
				ll->rap = LE_CSR0;
				ll->rdp = LE_C0_STOP;
				lance_init_ring(dev);
				load_csrs(lp);
				init_restart_lance(lp);
				return 0;
			}
		} else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
			/* So we don't count the packet more than once. */
			td->tmd1_bits &= ~(LE_T1_POK);

			/* One collision before packet was sent. */
			if (td->tmd1_bits & LE_T1_EONE)
				dev->stats.collisions++;

			/* More than one collision, be optimistic. */
			if (td->tmd1_bits & LE_T1_EMORE)
				dev->stats.collisions += 2;

			dev->stats.tx_packets++;
		}

		j = (j + 1) & lp->tx_ring_mod_mask;
	}
	lp->tx_old = j;
	ll->rdp = LE_C0_TINT | LE_C0_INEA;
	return 0;
}

static int lance_tx_buffs_avail(struct lance_private *lp)
{
	if (lp->tx_old <= lp->tx_new)
		return lp->tx_old + lp->tx_ring_mod_mask - lp->tx_new;
	return lp->tx_old - lp->tx_new - 1;
}

static irqreturn_t lance_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_regs *ll = lp->ll;
	int csr0;

	ll->rap = LE_CSR0;		/* LANCE Controller Status */
	csr0 = ll->rdp;

	if (!(csr0 & LE_C0_INTR))	/* Check if any interrupt has */
		return IRQ_NONE;	/* been generated by the Lance. */

	/* Acknowledge all the interrupt sources ASAP */
	ll->rdp = csr0 & ~(LE_C0_INEA | LE_C0_TDMD | LE_C0_STOP | LE_C0_STRT |
			   LE_C0_INIT);

	if (csr0 & LE_C0_ERR) {
		/* Clear the error condition */
		ll->rdp = LE_C0_BABL | LE_C0_ERR | LE_C0_MISS | LE_C0_INEA;
	}

	if (csr0 & LE_C0_RINT)
		lance_rx(dev);

	if (csr0 & LE_C0_TINT)
		lance_tx(dev);

	/* Log misc errors. */
	if (csr0 & LE_C0_BABL)
		dev->stats.tx_errors++;       /* Tx babble. */
	if (csr0 & LE_C0_MISS)
		dev->stats.rx_errors++;       /* Missed a Rx frame. */
	if (csr0 & LE_C0_MERR) {
		netdev_err(dev, "Bus master arbitration failure, status %04x\n",
			   csr0);
		/* Restart the chip. */
		ll->rdp = LE_C0_STRT;
	}

	if (netif_queue_stopped(dev) && lance_tx_buffs_avail(lp) > 0)
		netif_wake_queue(dev);

	ll->rap = LE_CSR0;
	ll->rdp = (LE_C0_BABL | LE_C0_CERR | LE_C0_MISS | LE_C0_MERR |
		   LE_C0_IDON | LE_C0_INEA);
	return IRQ_HANDLED;
}

static int lance_open(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_regs *ll = lp->ll;
	int ret;

	/* Stop the Lance */
	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_STOP;

	/* Install the Interrupt handler */
	ret = request_irq(IRQ_AMIGA_PORTS, lance_interrupt, IRQF_SHARED,
			  dev->name, dev);
	if (ret)
		return ret;

	load_csrs(lp);
	lance_init_ring(dev);

	netif_start_queue(dev);

	return init_restart_lance(lp);
}

static int lance_close(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_regs *ll = lp->ll;

	netif_stop_queue(dev);
	del_timer_sync(&lp->multicast_timer);

	/* Stop the card */
	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_STOP;

	free_irq(IRQ_AMIGA_PORTS, dev);
	return 0;
}

static inline int lance_reset(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_regs *ll = lp->ll;
	int status;

	/* Stop the lance */
	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_STOP;

	load_csrs(lp);

	lance_init_ring(dev);
	netif_trans_update(dev); /* prevent tx timeout */
	netif_start_queue(dev);

	status = init_restart_lance(lp);
	netdev_dbg(dev, "Lance restart=%d\n", status);

	return status;
}

static void lance_tx_timeout(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_regs *ll = lp->ll;

	netdev_err(dev, "transmit timed out, status %04x, reset\n", ll->rdp);
	lance_reset(dev);
	netif_wake_queue(dev);
}

static netdev_tx_t lance_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_regs *ll = lp->ll;
	volatile struct lance_init_block *ib = lp->init_block;
	int entry, skblen;
	int status = NETDEV_TX_OK;
	unsigned long flags;

	if (skb_padto(skb, ETH_ZLEN))
		return NETDEV_TX_OK;
	skblen = max_t(unsigned, skb->len, ETH_ZLEN);

	local_irq_save(flags);

	if (!lance_tx_buffs_avail(lp))
		goto out_free;

#ifdef DEBUG
	/* dump the packet */
	print_hex_dump(KERN_DEBUG, "skb->data: ", DUMP_PREFIX_NONE,
		       16, 1, skb->data, 64, true);
#endif
	entry = lp->tx_new & lp->tx_ring_mod_mask;
	ib->btx_ring[entry].length = (-skblen) | 0xf000;
	ib->btx_ring[entry].misc = 0;

	skb_copy_from_linear_data(skb, (void *)&ib->tx_buf[entry][0], skblen);

	/* Now, give the packet to the lance */
	ib->btx_ring[entry].tmd1_bits = (LE_T1_POK | LE_T1_OWN);
	lp->tx_new = (lp->tx_new+1) & lp->tx_ring_mod_mask;
	dev->stats.tx_bytes += skblen;

	if (lance_tx_buffs_avail(lp) <= 0)
		netif_stop_queue(dev);

	/* Kick the lance: transmit now */
	ll->rdp = LE_C0_INEA | LE_C0_TDMD;
 out_free:
	dev_kfree_skb(skb);

	local_irq_restore(flags);

	return status;
}

/* taken from the depca driver */
static void lance_load_multicast(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_init_block *ib = lp->init_block;
	volatile u16 *mcast_table = (u16 *)&ib->filter;
	struct netdev_hw_addr *ha;
	u32 crc;

	/* set all multicast bits */
	if (dev->flags & IFF_ALLMULTI) {
		ib->filter[0] = 0xffffffff;
		ib->filter[1] = 0xffffffff;
		return;
	}
	/* clear the multicast filter */
	ib->filter[0] = 0;
	ib->filter[1] = 0;

	/* Add addresses */
	netdev_for_each_mc_addr(ha, dev) {
		crc = ether_crc_le(6, ha->addr);
		crc = crc >> 26;
		mcast_table[crc >> 4] |= 1 << (crc & 0xf);
	}
}

static void lance_set_multicast(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_init_block *ib = lp->init_block;
	volatile struct lance_regs *ll = lp->ll;

	if (!netif_running(dev))
		return;

	if (lp->tx_old != lp->tx_new) {
		mod_timer(&lp->multicast_timer, jiffies + 4);
		netif_wake_queue(dev);
		return;
	}

	netif_stop_queue(dev);

	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_STOP;
	lance_init_ring(dev);

	if (dev->flags & IFF_PROMISC) {
		ib->mode |= LE_MO_PROM;
	} else {
		ib->mode &= ~LE_MO_PROM;
		lance_load_multicast(dev);
	}
	load_csrs(lp);
	init_restart_lance(lp);
	netif_wake_queue(dev);
}

static int a2065_init_one(struct zorro_dev *z,
			  const struct zorro_device_id *ent);
static void a2065_remove_one(struct zorro_dev *z);


static struct zorro_device_id a2065_zorro_tbl[] = {
	{ ZORRO_PROD_CBM_A2065_1 },
	{ ZORRO_PROD_CBM_A2065_2 },
	{ ZORRO_PROD_AMERISTAR_A2065 },
	{ 0 }
};
MODULE_DEVICE_TABLE(zorro, a2065_zorro_tbl);

static struct zorro_driver a2065_driver = {
	.name		= "a2065",
	.id_table	= a2065_zorro_tbl,
	.probe		= a2065_init_one,
	.remove		= a2065_remove_one,
};

static const struct net_device_ops lance_netdev_ops = {
	.ndo_open		= lance_open,
	.ndo_stop		= lance_close,
	.ndo_start_xmit		= lance_start_xmit,
	.ndo_tx_timeout		= lance_tx_timeout,
	.ndo_set_rx_mode	= lance_set_multicast,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address	= eth_mac_addr,
};

static int a2065_init_one(struct zorro_dev *z,
			  const struct zorro_device_id *ent)
{
	struct net_device *dev;
	struct lance_private *priv;
	unsigned long board = z->resource.start;
	unsigned long base_addr = board + A2065_LANCE;
	unsigned long mem_start = board + A2065_RAM;
	struct resource *r1, *r2;
	u32 serial;
	int err;

	r1 = request_mem_region(base_addr, sizeof(struct lance_regs),
				"Am7990");
	if (!r1)
		return -EBUSY;
	r2 = request_mem_region(mem_start, A2065_RAM_SIZE, "RAM");
	if (!r2) {
		release_mem_region(base_addr, sizeof(struct lance_regs));
		return -EBUSY;
	}

	dev = alloc_etherdev(sizeof(struct lance_private));
	if (dev == NULL) {
		release_mem_region(base_addr, sizeof(struct lance_regs));
		release_mem_region(mem_start, A2065_RAM_SIZE);
		return -ENOMEM;
	}

	priv = netdev_priv(dev);

	r1->name = dev->name;
	r2->name = dev->name;

	serial = be32_to_cpu(z->rom.er_SerialNumber);
	dev->dev_addr[0] = 0x00;
	if (z->id != ZORRO_PROD_AMERISTAR_A2065) {	/* Commodore */
		dev->dev_addr[1] = 0x80;
		dev->dev_addr[2] = 0x10;
	} else {					/* Ameristar */
		dev->dev_addr[1] = 0x00;
		dev->dev_addr[2] = 0x9f;
	}
	dev->dev_addr[3] = (serial >> 16) & 0xff;
	dev->dev_addr[4] = (serial >> 8) & 0xff;
	dev->dev_addr[5] = serial & 0xff;
	dev->base_addr = (unsigned long)ZTWO_VADDR(base_addr);
	dev->mem_start = (unsigned long)ZTWO_VADDR(mem_start);
	dev->mem_end = dev->mem_start + A2065_RAM_SIZE;

	priv->ll = (volatile struct lance_regs *)dev->base_addr;
	priv->init_block = (struct lance_init_block *)dev->mem_start;
	priv->lance_init_block = (struct lance_init_block *)A2065_RAM;
	priv->auto_select = 0;
	priv->busmaster_regval = LE_C3_BSWP;

	priv->lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
	priv->lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
	priv->rx_ring_mod_mask = RX_RING_MOD_MASK;
	priv->tx_ring_mod_mask = TX_RING_MOD_MASK;

	dev->netdev_ops = &lance_netdev_ops;
	dev->watchdog_timeo = 5*HZ;
	dev->dma = 0;

	init_timer(&priv->multicast_timer);
	priv->multicast_timer.data = (unsigned long) dev;
	priv->multicast_timer.function =
		(void (*)(unsigned long))lance_set_multicast;

	err = register_netdev(dev);
	if (err) {
		release_mem_region(base_addr, sizeof(struct lance_regs));
		release_mem_region(mem_start, A2065_RAM_SIZE);
		free_netdev(dev);
		return err;
	}
	zorro_set_drvdata(z, dev);

	netdev_info(dev, "A2065 at 0x%08lx, Ethernet Address %pM\n",
		    board, dev->dev_addr);

	return 0;
}


static void a2065_remove_one(struct zorro_dev *z)
{
	struct net_device *dev = zorro_get_drvdata(z);

	unregister_netdev(dev);
	release_mem_region(ZTWO_PADDR(dev->base_addr),
			   sizeof(struct lance_regs));
	release_mem_region(ZTWO_PADDR(dev->mem_start), A2065_RAM_SIZE);
	free_netdev(dev);
}

static int __init a2065_init_module(void)
{
	return zorro_register_driver(&a2065_driver);
}

static void __exit a2065_cleanup_module(void)
{
	zorro_unregister_driver(&a2065_driver);
}

module_init(a2065_init_module);
module_exit(a2065_cleanup_module);

MODULE_LICENSE("GPL");