xref: /linux/drivers/net/ethernet/amd/a2065.c (revision 44f57d78)
1 /*
2  * Amiga Linux/68k A2065 Ethernet Driver
3  *
4  * (C) Copyright 1995-2003 by Geert Uytterhoeven <geert@linux-m68k.org>
5  *
6  * Fixes and tips by:
7  *	- Janos Farkas (CHEXUM@sparta.banki.hu)
8  *	- Jes Degn Soerensen (jds@kom.auc.dk)
9  *	- Matt Domsch (Matt_Domsch@dell.com)
10  *
11  * ----------------------------------------------------------------------------
12  *
13  * This program is based on
14  *
15  *	ariadne.?:	Amiga Linux/68k Ariadne Ethernet Driver
16  *			(C) Copyright 1995 by Geert Uytterhoeven,
17  *                                            Peter De Schrijver
18  *
19  *	lance.c:	An AMD LANCE ethernet driver for linux.
20  *			Written 1993-94 by Donald Becker.
21  *
22  *	Am79C960:	PCnet(tm)-ISA Single-Chip Ethernet Controller
23  *			Advanced Micro Devices
24  *			Publication #16907, Rev. B, Amendment/0, May 1994
25  *
26  * ----------------------------------------------------------------------------
27  *
28  * This file is subject to the terms and conditions of the GNU General Public
29  * License.  See the file COPYING in the main directory of the Linux
30  * distribution for more details.
31  *
32  * ----------------------------------------------------------------------------
33  *
34  * The A2065 is a Zorro-II board made by Commodore/Ameristar. It contains:
35  *
36  *	- an Am7990 Local Area Network Controller for Ethernet (LANCE) with
37  *	  both 10BASE-2 (thin coax) and AUI (DB-15) connectors
38  */
39 
40 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
41 
42 /*#define DEBUG*/
43 /*#define TEST_HITS*/
44 
45 #include <linux/errno.h>
46 #include <linux/netdevice.h>
47 #include <linux/etherdevice.h>
48 #include <linux/module.h>
49 #include <linux/stddef.h>
50 #include <linux/kernel.h>
51 #include <linux/interrupt.h>
52 #include <linux/ioport.h>
53 #include <linux/skbuff.h>
54 #include <linux/string.h>
55 #include <linux/init.h>
56 #include <linux/crc32.h>
57 #include <linux/zorro.h>
58 #include <linux/bitops.h>
59 
60 #include <asm/byteorder.h>
61 #include <asm/irq.h>
62 #include <asm/amigaints.h>
63 #include <asm/amigahw.h>
64 
65 #include "a2065.h"
66 
67 /* Transmit/Receive Ring Definitions */
68 
69 #define LANCE_LOG_TX_BUFFERS	(2)
70 #define LANCE_LOG_RX_BUFFERS	(4)
71 
72 #define TX_RING_SIZE		(1 << LANCE_LOG_TX_BUFFERS)
73 #define RX_RING_SIZE		(1 << LANCE_LOG_RX_BUFFERS)
74 
75 #define TX_RING_MOD_MASK	(TX_RING_SIZE - 1)
76 #define RX_RING_MOD_MASK	(RX_RING_SIZE - 1)
77 
78 #define PKT_BUF_SIZE		(1544)
79 #define RX_BUFF_SIZE            PKT_BUF_SIZE
80 #define TX_BUFF_SIZE            PKT_BUF_SIZE
81 
82 /* Layout of the Lance's RAM Buffer */
83 
84 struct lance_init_block {
85 	unsigned short mode;		/* Pre-set mode (reg. 15) */
86 	unsigned char phys_addr[6];     /* Physical ethernet address */
87 	unsigned filter[2];		/* Multicast filter. */
88 
89 	/* Receive and transmit ring base, along with extra bits. */
90 	unsigned short rx_ptr;		/* receive descriptor addr */
91 	unsigned short rx_len;		/* receive len and high addr */
92 	unsigned short tx_ptr;		/* transmit descriptor addr */
93 	unsigned short tx_len;		/* transmit len and high addr */
94 
95 	/* The Tx and Rx ring entries must aligned on 8-byte boundaries. */
96 	struct lance_rx_desc brx_ring[RX_RING_SIZE];
97 	struct lance_tx_desc btx_ring[TX_RING_SIZE];
98 
99 	char rx_buf[RX_RING_SIZE][RX_BUFF_SIZE];
100 	char tx_buf[TX_RING_SIZE][TX_BUFF_SIZE];
101 };
102 
103 /* Private Device Data */
104 
105 struct lance_private {
106 	char *name;
107 	volatile struct lance_regs *ll;
108 	volatile struct lance_init_block *init_block;	    /* Hosts view */
109 	volatile struct lance_init_block *lance_init_block; /* Lance view */
110 
111 	int rx_new, tx_new;
112 	int rx_old, tx_old;
113 
114 	int lance_log_rx_bufs, lance_log_tx_bufs;
115 	int rx_ring_mod_mask, tx_ring_mod_mask;
116 
117 	int tpe;		      /* cable-selection is TPE */
118 	int auto_select;	      /* cable-selection by carrier */
119 	unsigned short busmaster_regval;
120 
121 #ifdef CONFIG_SUNLANCE
122 	struct Linux_SBus_DMA *ledma; /* if set this points to ledma and arch=4m */
123 	int burst_sizes;	      /* ledma SBus burst sizes */
124 #endif
125 	struct timer_list         multicast_timer;
126 	struct net_device	  *dev;
127 };
128 
129 #define LANCE_ADDR(x) ((int)(x) & ~0xff000000)
130 
131 /* Load the CSR registers */
132 static void load_csrs(struct lance_private *lp)
133 {
134 	volatile struct lance_regs *ll = lp->ll;
135 	volatile struct lance_init_block *aib = lp->lance_init_block;
136 	int leptr = LANCE_ADDR(aib);
137 
138 	ll->rap = LE_CSR1;
139 	ll->rdp = (leptr & 0xFFFF);
140 	ll->rap = LE_CSR2;
141 	ll->rdp = leptr >> 16;
142 	ll->rap = LE_CSR3;
143 	ll->rdp = lp->busmaster_regval;
144 
145 	/* Point back to csr0 */
146 	ll->rap = LE_CSR0;
147 }
148 
149 /* Setup the Lance Rx and Tx rings */
150 static void lance_init_ring(struct net_device *dev)
151 {
152 	struct lance_private *lp = netdev_priv(dev);
153 	volatile struct lance_init_block *ib = lp->init_block;
154 	volatile struct lance_init_block *aib = lp->lance_init_block;
155 					/* for LANCE_ADDR computations */
156 	int leptr;
157 	int i;
158 
159 	/* Lock out other processes while setting up hardware */
160 	netif_stop_queue(dev);
161 	lp->rx_new = lp->tx_new = 0;
162 	lp->rx_old = lp->tx_old = 0;
163 
164 	ib->mode = 0;
165 
166 	/* Copy the ethernet address to the lance init block
167 	 * Note that on the sparc you need to swap the ethernet address.
168 	 */
169 	ib->phys_addr[0] = dev->dev_addr[1];
170 	ib->phys_addr[1] = dev->dev_addr[0];
171 	ib->phys_addr[2] = dev->dev_addr[3];
172 	ib->phys_addr[3] = dev->dev_addr[2];
173 	ib->phys_addr[4] = dev->dev_addr[5];
174 	ib->phys_addr[5] = dev->dev_addr[4];
175 
176 	/* Setup the Tx ring entries */
177 	netdev_dbg(dev, "TX rings:\n");
178 	for (i = 0; i <= 1 << lp->lance_log_tx_bufs; i++) {
179 		leptr = LANCE_ADDR(&aib->tx_buf[i][0]);
180 		ib->btx_ring[i].tmd0      = leptr;
181 		ib->btx_ring[i].tmd1_hadr = leptr >> 16;
182 		ib->btx_ring[i].tmd1_bits = 0;
183 		ib->btx_ring[i].length    = 0xf000; /* The ones required by tmd2 */
184 		ib->btx_ring[i].misc      = 0;
185 		if (i < 3)
186 			netdev_dbg(dev, "%d: 0x%08x\n", i, leptr);
187 	}
188 
189 	/* Setup the Rx ring entries */
190 	netdev_dbg(dev, "RX rings:\n");
191 	for (i = 0; i < 1 << lp->lance_log_rx_bufs; i++) {
192 		leptr = LANCE_ADDR(&aib->rx_buf[i][0]);
193 
194 		ib->brx_ring[i].rmd0      = leptr;
195 		ib->brx_ring[i].rmd1_hadr = leptr >> 16;
196 		ib->brx_ring[i].rmd1_bits = LE_R1_OWN;
197 		ib->brx_ring[i].length    = -RX_BUFF_SIZE | 0xf000;
198 		ib->brx_ring[i].mblength  = 0;
199 		if (i < 3)
200 			netdev_dbg(dev, "%d: 0x%08x\n", i, leptr);
201 	}
202 
203 	/* Setup the initialization block */
204 
205 	/* Setup rx descriptor pointer */
206 	leptr = LANCE_ADDR(&aib->brx_ring);
207 	ib->rx_len = (lp->lance_log_rx_bufs << 13) | (leptr >> 16);
208 	ib->rx_ptr = leptr;
209 	netdev_dbg(dev, "RX ptr: %08x\n", leptr);
210 
211 	/* Setup tx descriptor pointer */
212 	leptr = LANCE_ADDR(&aib->btx_ring);
213 	ib->tx_len = (lp->lance_log_tx_bufs << 13) | (leptr >> 16);
214 	ib->tx_ptr = leptr;
215 	netdev_dbg(dev, "TX ptr: %08x\n", leptr);
216 
217 	/* Clear the multicast filter */
218 	ib->filter[0] = 0;
219 	ib->filter[1] = 0;
220 }
221 
222 static int init_restart_lance(struct lance_private *lp)
223 {
224 	volatile struct lance_regs *ll = lp->ll;
225 	int i;
226 
227 	ll->rap = LE_CSR0;
228 	ll->rdp = LE_C0_INIT;
229 
230 	/* Wait for the lance to complete initialization */
231 	for (i = 0; (i < 100) && !(ll->rdp & (LE_C0_ERR | LE_C0_IDON)); i++)
232 		barrier();
233 	if ((i == 100) || (ll->rdp & LE_C0_ERR)) {
234 		pr_err("unopened after %d ticks, csr0=%04x\n", i, ll->rdp);
235 		return -EIO;
236 	}
237 
238 	/* Clear IDON by writing a "1", enable interrupts and start lance */
239 	ll->rdp = LE_C0_IDON;
240 	ll->rdp = LE_C0_INEA | LE_C0_STRT;
241 
242 	return 0;
243 }
244 
245 static int lance_rx(struct net_device *dev)
246 {
247 	struct lance_private *lp = netdev_priv(dev);
248 	volatile struct lance_init_block *ib = lp->init_block;
249 	volatile struct lance_regs *ll = lp->ll;
250 	volatile struct lance_rx_desc *rd;
251 	unsigned char bits;
252 
253 #ifdef TEST_HITS
254 	int i;
255 	char buf[RX_RING_SIZE + 1];
256 
257 	for (i = 0; i < RX_RING_SIZE; i++) {
258 		char r1_own = ib->brx_ring[i].rmd1_bits & LE_R1_OWN;
259 		if (i == lp->rx_new)
260 			buf[i] = r1_own ? '_' : 'X';
261 		else
262 			buf[i] = r1_own ? '.' : '1';
263 	}
264 	buf[RX_RING_SIZE] = 0;
265 
266 	pr_debug("RxRing TestHits: [%s]\n", buf);
267 #endif
268 
269 	ll->rdp = LE_C0_RINT | LE_C0_INEA;
270 	for (rd = &ib->brx_ring[lp->rx_new];
271 	     !((bits = rd->rmd1_bits) & LE_R1_OWN);
272 	     rd = &ib->brx_ring[lp->rx_new]) {
273 
274 		/* We got an incomplete frame? */
275 		if ((bits & LE_R1_POK) != LE_R1_POK) {
276 			dev->stats.rx_over_errors++;
277 			dev->stats.rx_errors++;
278 			continue;
279 		} else if (bits & LE_R1_ERR) {
280 			/* Count only the end frame as a rx error,
281 			 * not the beginning
282 			 */
283 			if (bits & LE_R1_BUF)
284 				dev->stats.rx_fifo_errors++;
285 			if (bits & LE_R1_CRC)
286 				dev->stats.rx_crc_errors++;
287 			if (bits & LE_R1_OFL)
288 				dev->stats.rx_over_errors++;
289 			if (bits & LE_R1_FRA)
290 				dev->stats.rx_frame_errors++;
291 			if (bits & LE_R1_EOP)
292 				dev->stats.rx_errors++;
293 		} else {
294 			int len = (rd->mblength & 0xfff) - 4;
295 			struct sk_buff *skb = netdev_alloc_skb(dev, len + 2);
296 
297 			if (!skb) {
298 				dev->stats.rx_dropped++;
299 				rd->mblength = 0;
300 				rd->rmd1_bits = LE_R1_OWN;
301 				lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
302 				return 0;
303 			}
304 
305 			skb_reserve(skb, 2);		/* 16 byte align */
306 			skb_put(skb, len);		/* make room */
307 			skb_copy_to_linear_data(skb,
308 				 (unsigned char *)&ib->rx_buf[lp->rx_new][0],
309 				 len);
310 			skb->protocol = eth_type_trans(skb, dev);
311 			netif_rx(skb);
312 			dev->stats.rx_packets++;
313 			dev->stats.rx_bytes += len;
314 		}
315 
316 		/* Return the packet to the pool */
317 		rd->mblength = 0;
318 		rd->rmd1_bits = LE_R1_OWN;
319 		lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
320 	}
321 	return 0;
322 }
323 
324 static int lance_tx(struct net_device *dev)
325 {
326 	struct lance_private *lp = netdev_priv(dev);
327 	volatile struct lance_init_block *ib = lp->init_block;
328 	volatile struct lance_regs *ll = lp->ll;
329 	volatile struct lance_tx_desc *td;
330 	int i, j;
331 	int status;
332 
333 	/* csr0 is 2f3 */
334 	ll->rdp = LE_C0_TINT | LE_C0_INEA;
335 	/* csr0 is 73 */
336 
337 	j = lp->tx_old;
338 	for (i = j; i != lp->tx_new; i = j) {
339 		td = &ib->btx_ring[i];
340 
341 		/* If we hit a packet not owned by us, stop */
342 		if (td->tmd1_bits & LE_T1_OWN)
343 			break;
344 
345 		if (td->tmd1_bits & LE_T1_ERR) {
346 			status = td->misc;
347 
348 			dev->stats.tx_errors++;
349 			if (status & LE_T3_RTY)
350 				dev->stats.tx_aborted_errors++;
351 			if (status & LE_T3_LCOL)
352 				dev->stats.tx_window_errors++;
353 
354 			if (status & LE_T3_CLOS) {
355 				dev->stats.tx_carrier_errors++;
356 				if (lp->auto_select) {
357 					lp->tpe = 1 - lp->tpe;
358 					netdev_err(dev, "Carrier Lost, trying %s\n",
359 						   lp->tpe ? "TPE" : "AUI");
360 					/* Stop the lance */
361 					ll->rap = LE_CSR0;
362 					ll->rdp = LE_C0_STOP;
363 					lance_init_ring(dev);
364 					load_csrs(lp);
365 					init_restart_lance(lp);
366 					return 0;
367 				}
368 			}
369 
370 			/* buffer errors and underflows turn off
371 			 * the transmitter, so restart the adapter
372 			 */
373 			if (status & (LE_T3_BUF | LE_T3_UFL)) {
374 				dev->stats.tx_fifo_errors++;
375 
376 				netdev_err(dev, "Tx: ERR_BUF|ERR_UFL, restarting\n");
377 				/* Stop the lance */
378 				ll->rap = LE_CSR0;
379 				ll->rdp = LE_C0_STOP;
380 				lance_init_ring(dev);
381 				load_csrs(lp);
382 				init_restart_lance(lp);
383 				return 0;
384 			}
385 		} else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
386 			/* So we don't count the packet more than once. */
387 			td->tmd1_bits &= ~(LE_T1_POK);
388 
389 			/* One collision before packet was sent. */
390 			if (td->tmd1_bits & LE_T1_EONE)
391 				dev->stats.collisions++;
392 
393 			/* More than one collision, be optimistic. */
394 			if (td->tmd1_bits & LE_T1_EMORE)
395 				dev->stats.collisions += 2;
396 
397 			dev->stats.tx_packets++;
398 		}
399 
400 		j = (j + 1) & lp->tx_ring_mod_mask;
401 	}
402 	lp->tx_old = j;
403 	ll->rdp = LE_C0_TINT | LE_C0_INEA;
404 	return 0;
405 }
406 
407 static int lance_tx_buffs_avail(struct lance_private *lp)
408 {
409 	if (lp->tx_old <= lp->tx_new)
410 		return lp->tx_old + lp->tx_ring_mod_mask - lp->tx_new;
411 	return lp->tx_old - lp->tx_new - 1;
412 }
413 
414 static irqreturn_t lance_interrupt(int irq, void *dev_id)
415 {
416 	struct net_device *dev = dev_id;
417 	struct lance_private *lp = netdev_priv(dev);
418 	volatile struct lance_regs *ll = lp->ll;
419 	int csr0;
420 
421 	ll->rap = LE_CSR0;		/* LANCE Controller Status */
422 	csr0 = ll->rdp;
423 
424 	if (!(csr0 & LE_C0_INTR))	/* Check if any interrupt has */
425 		return IRQ_NONE;	/* been generated by the Lance. */
426 
427 	/* Acknowledge all the interrupt sources ASAP */
428 	ll->rdp = csr0 & ~(LE_C0_INEA | LE_C0_TDMD | LE_C0_STOP | LE_C0_STRT |
429 			   LE_C0_INIT);
430 
431 	if (csr0 & LE_C0_ERR) {
432 		/* Clear the error condition */
433 		ll->rdp = LE_C0_BABL | LE_C0_ERR | LE_C0_MISS | LE_C0_INEA;
434 	}
435 
436 	if (csr0 & LE_C0_RINT)
437 		lance_rx(dev);
438 
439 	if (csr0 & LE_C0_TINT)
440 		lance_tx(dev);
441 
442 	/* Log misc errors. */
443 	if (csr0 & LE_C0_BABL)
444 		dev->stats.tx_errors++;       /* Tx babble. */
445 	if (csr0 & LE_C0_MISS)
446 		dev->stats.rx_errors++;       /* Missed a Rx frame. */
447 	if (csr0 & LE_C0_MERR) {
448 		netdev_err(dev, "Bus master arbitration failure, status %04x\n",
449 			   csr0);
450 		/* Restart the chip. */
451 		ll->rdp = LE_C0_STRT;
452 	}
453 
454 	if (netif_queue_stopped(dev) && lance_tx_buffs_avail(lp) > 0)
455 		netif_wake_queue(dev);
456 
457 	ll->rap = LE_CSR0;
458 	ll->rdp = (LE_C0_BABL | LE_C0_CERR | LE_C0_MISS | LE_C0_MERR |
459 		   LE_C0_IDON | LE_C0_INEA);
460 	return IRQ_HANDLED;
461 }
462 
463 static int lance_open(struct net_device *dev)
464 {
465 	struct lance_private *lp = netdev_priv(dev);
466 	volatile struct lance_regs *ll = lp->ll;
467 	int ret;
468 
469 	/* Stop the Lance */
470 	ll->rap = LE_CSR0;
471 	ll->rdp = LE_C0_STOP;
472 
473 	/* Install the Interrupt handler */
474 	ret = request_irq(IRQ_AMIGA_PORTS, lance_interrupt, IRQF_SHARED,
475 			  dev->name, dev);
476 	if (ret)
477 		return ret;
478 
479 	load_csrs(lp);
480 	lance_init_ring(dev);
481 
482 	netif_start_queue(dev);
483 
484 	return init_restart_lance(lp);
485 }
486 
487 static int lance_close(struct net_device *dev)
488 {
489 	struct lance_private *lp = netdev_priv(dev);
490 	volatile struct lance_regs *ll = lp->ll;
491 
492 	netif_stop_queue(dev);
493 	del_timer_sync(&lp->multicast_timer);
494 
495 	/* Stop the card */
496 	ll->rap = LE_CSR0;
497 	ll->rdp = LE_C0_STOP;
498 
499 	free_irq(IRQ_AMIGA_PORTS, dev);
500 	return 0;
501 }
502 
503 static inline int lance_reset(struct net_device *dev)
504 {
505 	struct lance_private *lp = netdev_priv(dev);
506 	volatile struct lance_regs *ll = lp->ll;
507 	int status;
508 
509 	/* Stop the lance */
510 	ll->rap = LE_CSR0;
511 	ll->rdp = LE_C0_STOP;
512 
513 	load_csrs(lp);
514 
515 	lance_init_ring(dev);
516 	netif_trans_update(dev); /* prevent tx timeout */
517 	netif_start_queue(dev);
518 
519 	status = init_restart_lance(lp);
520 	netdev_dbg(dev, "Lance restart=%d\n", status);
521 
522 	return status;
523 }
524 
525 static void lance_tx_timeout(struct net_device *dev)
526 {
527 	struct lance_private *lp = netdev_priv(dev);
528 	volatile struct lance_regs *ll = lp->ll;
529 
530 	netdev_err(dev, "transmit timed out, status %04x, reset\n", ll->rdp);
531 	lance_reset(dev);
532 	netif_wake_queue(dev);
533 }
534 
535 static netdev_tx_t lance_start_xmit(struct sk_buff *skb,
536 				    struct net_device *dev)
537 {
538 	struct lance_private *lp = netdev_priv(dev);
539 	volatile struct lance_regs *ll = lp->ll;
540 	volatile struct lance_init_block *ib = lp->init_block;
541 	int entry, skblen;
542 	int status = NETDEV_TX_OK;
543 	unsigned long flags;
544 
545 	if (skb_padto(skb, ETH_ZLEN))
546 		return NETDEV_TX_OK;
547 	skblen = max_t(unsigned, skb->len, ETH_ZLEN);
548 
549 	local_irq_save(flags);
550 
551 	if (!lance_tx_buffs_avail(lp))
552 		goto out_free;
553 
554 #ifdef DEBUG
555 	/* dump the packet */
556 	print_hex_dump(KERN_DEBUG, "skb->data: ", DUMP_PREFIX_NONE,
557 		       16, 1, skb->data, 64, true);
558 #endif
559 	entry = lp->tx_new & lp->tx_ring_mod_mask;
560 	ib->btx_ring[entry].length = (-skblen) | 0xf000;
561 	ib->btx_ring[entry].misc = 0;
562 
563 	skb_copy_from_linear_data(skb, (void *)&ib->tx_buf[entry][0], skblen);
564 
565 	/* Now, give the packet to the lance */
566 	ib->btx_ring[entry].tmd1_bits = (LE_T1_POK | LE_T1_OWN);
567 	lp->tx_new = (lp->tx_new+1) & lp->tx_ring_mod_mask;
568 	dev->stats.tx_bytes += skblen;
569 
570 	if (lance_tx_buffs_avail(lp) <= 0)
571 		netif_stop_queue(dev);
572 
573 	/* Kick the lance: transmit now */
574 	ll->rdp = LE_C0_INEA | LE_C0_TDMD;
575  out_free:
576 	dev_kfree_skb(skb);
577 
578 	local_irq_restore(flags);
579 
580 	return status;
581 }
582 
583 /* taken from the depca driver */
584 static void lance_load_multicast(struct net_device *dev)
585 {
586 	struct lance_private *lp = netdev_priv(dev);
587 	volatile struct lance_init_block *ib = lp->init_block;
588 	volatile u16 *mcast_table = (u16 *)&ib->filter;
589 	struct netdev_hw_addr *ha;
590 	u32 crc;
591 
592 	/* set all multicast bits */
593 	if (dev->flags & IFF_ALLMULTI) {
594 		ib->filter[0] = 0xffffffff;
595 		ib->filter[1] = 0xffffffff;
596 		return;
597 	}
598 	/* clear the multicast filter */
599 	ib->filter[0] = 0;
600 	ib->filter[1] = 0;
601 
602 	/* Add addresses */
603 	netdev_for_each_mc_addr(ha, dev) {
604 		crc = ether_crc_le(6, ha->addr);
605 		crc = crc >> 26;
606 		mcast_table[crc >> 4] |= 1 << (crc & 0xf);
607 	}
608 }
609 
610 static void lance_set_multicast(struct net_device *dev)
611 {
612 	struct lance_private *lp = netdev_priv(dev);
613 	volatile struct lance_init_block *ib = lp->init_block;
614 	volatile struct lance_regs *ll = lp->ll;
615 
616 	if (!netif_running(dev))
617 		return;
618 
619 	if (lp->tx_old != lp->tx_new) {
620 		mod_timer(&lp->multicast_timer, jiffies + 4);
621 		netif_wake_queue(dev);
622 		return;
623 	}
624 
625 	netif_stop_queue(dev);
626 
627 	ll->rap = LE_CSR0;
628 	ll->rdp = LE_C0_STOP;
629 	lance_init_ring(dev);
630 
631 	if (dev->flags & IFF_PROMISC) {
632 		ib->mode |= LE_MO_PROM;
633 	} else {
634 		ib->mode &= ~LE_MO_PROM;
635 		lance_load_multicast(dev);
636 	}
637 	load_csrs(lp);
638 	init_restart_lance(lp);
639 	netif_wake_queue(dev);
640 }
641 
642 static void lance_set_multicast_retry(struct timer_list *t)
643 {
644 	struct lance_private *lp = from_timer(lp, t, multicast_timer);
645 
646 	lance_set_multicast(lp->dev);
647 }
648 
649 static int a2065_init_one(struct zorro_dev *z,
650 			  const struct zorro_device_id *ent);
651 static void a2065_remove_one(struct zorro_dev *z);
652 
653 
654 static const struct zorro_device_id a2065_zorro_tbl[] = {
655 	{ ZORRO_PROD_CBM_A2065_1 },
656 	{ ZORRO_PROD_CBM_A2065_2 },
657 	{ ZORRO_PROD_AMERISTAR_A2065 },
658 	{ 0 }
659 };
660 MODULE_DEVICE_TABLE(zorro, a2065_zorro_tbl);
661 
662 static struct zorro_driver a2065_driver = {
663 	.name		= "a2065",
664 	.id_table	= a2065_zorro_tbl,
665 	.probe		= a2065_init_one,
666 	.remove		= a2065_remove_one,
667 };
668 
669 static const struct net_device_ops lance_netdev_ops = {
670 	.ndo_open		= lance_open,
671 	.ndo_stop		= lance_close,
672 	.ndo_start_xmit		= lance_start_xmit,
673 	.ndo_tx_timeout		= lance_tx_timeout,
674 	.ndo_set_rx_mode	= lance_set_multicast,
675 	.ndo_validate_addr	= eth_validate_addr,
676 	.ndo_set_mac_address	= eth_mac_addr,
677 };
678 
679 static int a2065_init_one(struct zorro_dev *z,
680 			  const struct zorro_device_id *ent)
681 {
682 	struct net_device *dev;
683 	struct lance_private *priv;
684 	unsigned long board = z->resource.start;
685 	unsigned long base_addr = board + A2065_LANCE;
686 	unsigned long mem_start = board + A2065_RAM;
687 	struct resource *r1, *r2;
688 	u32 serial;
689 	int err;
690 
691 	r1 = request_mem_region(base_addr, sizeof(struct lance_regs),
692 				"Am7990");
693 	if (!r1)
694 		return -EBUSY;
695 	r2 = request_mem_region(mem_start, A2065_RAM_SIZE, "RAM");
696 	if (!r2) {
697 		release_mem_region(base_addr, sizeof(struct lance_regs));
698 		return -EBUSY;
699 	}
700 
701 	dev = alloc_etherdev(sizeof(struct lance_private));
702 	if (dev == NULL) {
703 		release_mem_region(base_addr, sizeof(struct lance_regs));
704 		release_mem_region(mem_start, A2065_RAM_SIZE);
705 		return -ENOMEM;
706 	}
707 
708 	priv = netdev_priv(dev);
709 
710 	r1->name = dev->name;
711 	r2->name = dev->name;
712 
713 	serial = be32_to_cpu(z->rom.er_SerialNumber);
714 	dev->dev_addr[0] = 0x00;
715 	if (z->id != ZORRO_PROD_AMERISTAR_A2065) {	/* Commodore */
716 		dev->dev_addr[1] = 0x80;
717 		dev->dev_addr[2] = 0x10;
718 	} else {					/* Ameristar */
719 		dev->dev_addr[1] = 0x00;
720 		dev->dev_addr[2] = 0x9f;
721 	}
722 	dev->dev_addr[3] = (serial >> 16) & 0xff;
723 	dev->dev_addr[4] = (serial >> 8) & 0xff;
724 	dev->dev_addr[5] = serial & 0xff;
725 	dev->base_addr = (unsigned long)ZTWO_VADDR(base_addr);
726 	dev->mem_start = (unsigned long)ZTWO_VADDR(mem_start);
727 	dev->mem_end = dev->mem_start + A2065_RAM_SIZE;
728 
729 	priv->ll = (volatile struct lance_regs *)dev->base_addr;
730 	priv->init_block = (struct lance_init_block *)dev->mem_start;
731 	priv->lance_init_block = (struct lance_init_block *)A2065_RAM;
732 	priv->auto_select = 0;
733 	priv->busmaster_regval = LE_C3_BSWP;
734 
735 	priv->lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
736 	priv->lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
737 	priv->rx_ring_mod_mask = RX_RING_MOD_MASK;
738 	priv->tx_ring_mod_mask = TX_RING_MOD_MASK;
739 	priv->dev = dev;
740 
741 	dev->netdev_ops = &lance_netdev_ops;
742 	dev->watchdog_timeo = 5*HZ;
743 	dev->dma = 0;
744 
745 	timer_setup(&priv->multicast_timer, lance_set_multicast_retry, 0);
746 
747 	err = register_netdev(dev);
748 	if (err) {
749 		release_mem_region(base_addr, sizeof(struct lance_regs));
750 		release_mem_region(mem_start, A2065_RAM_SIZE);
751 		free_netdev(dev);
752 		return err;
753 	}
754 	zorro_set_drvdata(z, dev);
755 
756 	netdev_info(dev, "A2065 at 0x%08lx, Ethernet Address %pM\n",
757 		    board, dev->dev_addr);
758 
759 	return 0;
760 }
761 
762 
763 static void a2065_remove_one(struct zorro_dev *z)
764 {
765 	struct net_device *dev = zorro_get_drvdata(z);
766 
767 	unregister_netdev(dev);
768 	release_mem_region(ZTWO_PADDR(dev->base_addr),
769 			   sizeof(struct lance_regs));
770 	release_mem_region(ZTWO_PADDR(dev->mem_start), A2065_RAM_SIZE);
771 	free_netdev(dev);
772 }
773 
774 static int __init a2065_init_module(void)
775 {
776 	return zorro_register_driver(&a2065_driver);
777 }
778 
779 static void __exit a2065_cleanup_module(void)
780 {
781 	zorro_unregister_driver(&a2065_driver);
782 }
783 
784 module_init(a2065_init_module);
785 module_exit(a2065_cleanup_module);
786 
787 MODULE_LICENSE("GPL");
788