xref: /openbmc/linux/drivers/net/ethernet/amd/a2065.c (revision 31b90347)
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/irq.h>
61 #include <asm/amigaints.h>
62 #include <asm/amigahw.h>
63 
64 #include "a2065.h"
65 
66 /* Transmit/Receive Ring Definitions */
67 
68 #define LANCE_LOG_TX_BUFFERS	(2)
69 #define LANCE_LOG_RX_BUFFERS	(4)
70 
71 #define TX_RING_SIZE		(1 << LANCE_LOG_TX_BUFFERS)
72 #define RX_RING_SIZE		(1 << LANCE_LOG_RX_BUFFERS)
73 
74 #define TX_RING_MOD_MASK	(TX_RING_SIZE - 1)
75 #define RX_RING_MOD_MASK	(RX_RING_SIZE - 1)
76 
77 #define PKT_BUF_SIZE		(1544)
78 #define RX_BUFF_SIZE            PKT_BUF_SIZE
79 #define TX_BUFF_SIZE            PKT_BUF_SIZE
80 
81 /* Layout of the Lance's RAM Buffer */
82 
83 struct lance_init_block {
84 	unsigned short mode;		/* Pre-set mode (reg. 15) */
85 	unsigned char phys_addr[6];     /* Physical ethernet address */
86 	unsigned filter[2];		/* Multicast filter. */
87 
88 	/* Receive and transmit ring base, along with extra bits. */
89 	unsigned short rx_ptr;		/* receive descriptor addr */
90 	unsigned short rx_len;		/* receive len and high addr */
91 	unsigned short tx_ptr;		/* transmit descriptor addr */
92 	unsigned short tx_len;		/* transmit len and high addr */
93 
94 	/* The Tx and Rx ring entries must aligned on 8-byte boundaries. */
95 	struct lance_rx_desc brx_ring[RX_RING_SIZE];
96 	struct lance_tx_desc btx_ring[TX_RING_SIZE];
97 
98 	char rx_buf[RX_RING_SIZE][RX_BUFF_SIZE];
99 	char tx_buf[TX_RING_SIZE][TX_BUFF_SIZE];
100 };
101 
102 /* Private Device Data */
103 
104 struct lance_private {
105 	char *name;
106 	volatile struct lance_regs *ll;
107 	volatile struct lance_init_block *init_block;	    /* Hosts view */
108 	volatile struct lance_init_block *lance_init_block; /* Lance view */
109 
110 	int rx_new, tx_new;
111 	int rx_old, tx_old;
112 
113 	int lance_log_rx_bufs, lance_log_tx_bufs;
114 	int rx_ring_mod_mask, tx_ring_mod_mask;
115 
116 	int tpe;		      /* cable-selection is TPE */
117 	int auto_select;	      /* cable-selection by carrier */
118 	unsigned short busmaster_regval;
119 
120 #ifdef CONFIG_SUNLANCE
121 	struct Linux_SBus_DMA *ledma; /* if set this points to ledma and arch=4m */
122 	int burst_sizes;	      /* ledma SBus burst sizes */
123 #endif
124 	struct timer_list         multicast_timer;
125 };
126 
127 #define LANCE_ADDR(x) ((int)(x) & ~0xff000000)
128 
129 /* Load the CSR registers */
130 static void load_csrs(struct lance_private *lp)
131 {
132 	volatile struct lance_regs *ll = lp->ll;
133 	volatile struct lance_init_block *aib = lp->lance_init_block;
134 	int leptr = LANCE_ADDR(aib);
135 
136 	ll->rap = LE_CSR1;
137 	ll->rdp = (leptr & 0xFFFF);
138 	ll->rap = LE_CSR2;
139 	ll->rdp = leptr >> 16;
140 	ll->rap = LE_CSR3;
141 	ll->rdp = lp->busmaster_regval;
142 
143 	/* Point back to csr0 */
144 	ll->rap = LE_CSR0;
145 }
146 
147 /* Setup the Lance Rx and Tx rings */
148 static void lance_init_ring(struct net_device *dev)
149 {
150 	struct lance_private *lp = netdev_priv(dev);
151 	volatile struct lance_init_block *ib = lp->init_block;
152 	volatile struct lance_init_block *aib = lp->lance_init_block;
153 					/* for LANCE_ADDR computations */
154 	int leptr;
155 	int i;
156 
157 	/* Lock out other processes while setting up hardware */
158 	netif_stop_queue(dev);
159 	lp->rx_new = lp->tx_new = 0;
160 	lp->rx_old = lp->tx_old = 0;
161 
162 	ib->mode = 0;
163 
164 	/* Copy the ethernet address to the lance init block
165 	 * Note that on the sparc you need to swap the ethernet address.
166 	 */
167 	ib->phys_addr[0] = dev->dev_addr[1];
168 	ib->phys_addr[1] = dev->dev_addr[0];
169 	ib->phys_addr[2] = dev->dev_addr[3];
170 	ib->phys_addr[3] = dev->dev_addr[2];
171 	ib->phys_addr[4] = dev->dev_addr[5];
172 	ib->phys_addr[5] = dev->dev_addr[4];
173 
174 	/* Setup the Tx ring entries */
175 	netdev_dbg(dev, "TX rings:\n");
176 	for (i = 0; i <= 1 << lp->lance_log_tx_bufs; i++) {
177 		leptr = LANCE_ADDR(&aib->tx_buf[i][0]);
178 		ib->btx_ring[i].tmd0      = leptr;
179 		ib->btx_ring[i].tmd1_hadr = leptr >> 16;
180 		ib->btx_ring[i].tmd1_bits = 0;
181 		ib->btx_ring[i].length    = 0xf000; /* The ones required by tmd2 */
182 		ib->btx_ring[i].misc      = 0;
183 		if (i < 3)
184 			netdev_dbg(dev, "%d: 0x%08x\n", i, leptr);
185 	}
186 
187 	/* Setup the Rx ring entries */
188 	netdev_dbg(dev, "RX rings:\n");
189 	for (i = 0; i < 1 << lp->lance_log_rx_bufs; i++) {
190 		leptr = LANCE_ADDR(&aib->rx_buf[i][0]);
191 
192 		ib->brx_ring[i].rmd0      = leptr;
193 		ib->brx_ring[i].rmd1_hadr = leptr >> 16;
194 		ib->brx_ring[i].rmd1_bits = LE_R1_OWN;
195 		ib->brx_ring[i].length    = -RX_BUFF_SIZE | 0xf000;
196 		ib->brx_ring[i].mblength  = 0;
197 		if (i < 3)
198 			netdev_dbg(dev, "%d: 0x%08x\n", i, leptr);
199 	}
200 
201 	/* Setup the initialization block */
202 
203 	/* Setup rx descriptor pointer */
204 	leptr = LANCE_ADDR(&aib->brx_ring);
205 	ib->rx_len = (lp->lance_log_rx_bufs << 13) | (leptr >> 16);
206 	ib->rx_ptr = leptr;
207 	netdev_dbg(dev, "RX ptr: %08x\n", leptr);
208 
209 	/* Setup tx descriptor pointer */
210 	leptr = LANCE_ADDR(&aib->btx_ring);
211 	ib->tx_len = (lp->lance_log_tx_bufs << 13) | (leptr >> 16);
212 	ib->tx_ptr = leptr;
213 	netdev_dbg(dev, "TX ptr: %08x\n", leptr);
214 
215 	/* Clear the multicast filter */
216 	ib->filter[0] = 0;
217 	ib->filter[1] = 0;
218 }
219 
220 static int init_restart_lance(struct lance_private *lp)
221 {
222 	volatile struct lance_regs *ll = lp->ll;
223 	int i;
224 
225 	ll->rap = LE_CSR0;
226 	ll->rdp = LE_C0_INIT;
227 
228 	/* Wait for the lance to complete initialization */
229 	for (i = 0; (i < 100) && !(ll->rdp & (LE_C0_ERR | LE_C0_IDON)); i++)
230 		barrier();
231 	if ((i == 100) || (ll->rdp & LE_C0_ERR)) {
232 		pr_err("unopened after %d ticks, csr0=%04x\n", i, ll->rdp);
233 		return -EIO;
234 	}
235 
236 	/* Clear IDON by writing a "1", enable interrupts and start lance */
237 	ll->rdp = LE_C0_IDON;
238 	ll->rdp = LE_C0_INEA | LE_C0_STRT;
239 
240 	return 0;
241 }
242 
243 static int lance_rx(struct net_device *dev)
244 {
245 	struct lance_private *lp = netdev_priv(dev);
246 	volatile struct lance_init_block *ib = lp->init_block;
247 	volatile struct lance_regs *ll = lp->ll;
248 	volatile struct lance_rx_desc *rd;
249 	unsigned char bits;
250 
251 #ifdef TEST_HITS
252 	int i;
253 	char buf[RX_RING_SIZE + 1];
254 
255 	for (i = 0; i < RX_RING_SIZE; i++) {
256 		char r1_own = ib->brx_ring[i].rmd1_bits & LE_R1_OWN;
257 		if (i == lp->rx_new)
258 			buf[i] = r1_own ? '_' : 'X';
259 		else
260 			buf[i] = r1_own ? '.' : '1';
261 	}
262 	buf[RX_RING_SIZE] = 0;
263 
264 	pr_debug("RxRing TestHits: [%s]\n", buf);
265 #endif
266 
267 	ll->rdp = LE_C0_RINT | LE_C0_INEA;
268 	for (rd = &ib->brx_ring[lp->rx_new];
269 	     !((bits = rd->rmd1_bits) & LE_R1_OWN);
270 	     rd = &ib->brx_ring[lp->rx_new]) {
271 
272 		/* We got an incomplete frame? */
273 		if ((bits & LE_R1_POK) != LE_R1_POK) {
274 			dev->stats.rx_over_errors++;
275 			dev->stats.rx_errors++;
276 			continue;
277 		} else if (bits & LE_R1_ERR) {
278 			/* Count only the end frame as a rx error,
279 			 * not the beginning
280 			 */
281 			if (bits & LE_R1_BUF)
282 				dev->stats.rx_fifo_errors++;
283 			if (bits & LE_R1_CRC)
284 				dev->stats.rx_crc_errors++;
285 			if (bits & LE_R1_OFL)
286 				dev->stats.rx_over_errors++;
287 			if (bits & LE_R1_FRA)
288 				dev->stats.rx_frame_errors++;
289 			if (bits & LE_R1_EOP)
290 				dev->stats.rx_errors++;
291 		} else {
292 			int len = (rd->mblength & 0xfff) - 4;
293 			struct sk_buff *skb = netdev_alloc_skb(dev, len + 2);
294 
295 			if (!skb) {
296 				dev->stats.rx_dropped++;
297 				rd->mblength = 0;
298 				rd->rmd1_bits = LE_R1_OWN;
299 				lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
300 				return 0;
301 			}
302 
303 			skb_reserve(skb, 2);		/* 16 byte align */
304 			skb_put(skb, len);		/* make room */
305 			skb_copy_to_linear_data(skb,
306 				 (unsigned char *)&ib->rx_buf[lp->rx_new][0],
307 				 len);
308 			skb->protocol = eth_type_trans(skb, dev);
309 			netif_rx(skb);
310 			dev->stats.rx_packets++;
311 			dev->stats.rx_bytes += len;
312 		}
313 
314 		/* Return the packet to the pool */
315 		rd->mblength = 0;
316 		rd->rmd1_bits = LE_R1_OWN;
317 		lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
318 	}
319 	return 0;
320 }
321 
322 static int lance_tx(struct net_device *dev)
323 {
324 	struct lance_private *lp = netdev_priv(dev);
325 	volatile struct lance_init_block *ib = lp->init_block;
326 	volatile struct lance_regs *ll = lp->ll;
327 	volatile struct lance_tx_desc *td;
328 	int i, j;
329 	int status;
330 
331 	/* csr0 is 2f3 */
332 	ll->rdp = LE_C0_TINT | LE_C0_INEA;
333 	/* csr0 is 73 */
334 
335 	j = lp->tx_old;
336 	for (i = j; i != lp->tx_new; i = j) {
337 		td = &ib->btx_ring[i];
338 
339 		/* If we hit a packet not owned by us, stop */
340 		if (td->tmd1_bits & LE_T1_OWN)
341 			break;
342 
343 		if (td->tmd1_bits & LE_T1_ERR) {
344 			status = td->misc;
345 
346 			dev->stats.tx_errors++;
347 			if (status & LE_T3_RTY)
348 				dev->stats.tx_aborted_errors++;
349 			if (status & LE_T3_LCOL)
350 				dev->stats.tx_window_errors++;
351 
352 			if (status & LE_T3_CLOS) {
353 				dev->stats.tx_carrier_errors++;
354 				if (lp->auto_select) {
355 					lp->tpe = 1 - lp->tpe;
356 					netdev_err(dev, "Carrier Lost, trying %s\n",
357 						   lp->tpe ? "TPE" : "AUI");
358 					/* Stop the lance */
359 					ll->rap = LE_CSR0;
360 					ll->rdp = LE_C0_STOP;
361 					lance_init_ring(dev);
362 					load_csrs(lp);
363 					init_restart_lance(lp);
364 					return 0;
365 				}
366 			}
367 
368 			/* buffer errors and underflows turn off
369 			 * the transmitter, so restart the adapter
370 			 */
371 			if (status & (LE_T3_BUF | LE_T3_UFL)) {
372 				dev->stats.tx_fifo_errors++;
373 
374 				netdev_err(dev, "Tx: ERR_BUF|ERR_UFL, restarting\n");
375 				/* Stop the lance */
376 				ll->rap = LE_CSR0;
377 				ll->rdp = LE_C0_STOP;
378 				lance_init_ring(dev);
379 				load_csrs(lp);
380 				init_restart_lance(lp);
381 				return 0;
382 			}
383 		} else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
384 			/* So we don't count the packet more than once. */
385 			td->tmd1_bits &= ~(LE_T1_POK);
386 
387 			/* One collision before packet was sent. */
388 			if (td->tmd1_bits & LE_T1_EONE)
389 				dev->stats.collisions++;
390 
391 			/* More than one collision, be optimistic. */
392 			if (td->tmd1_bits & LE_T1_EMORE)
393 				dev->stats.collisions += 2;
394 
395 			dev->stats.tx_packets++;
396 		}
397 
398 		j = (j + 1) & lp->tx_ring_mod_mask;
399 	}
400 	lp->tx_old = j;
401 	ll->rdp = LE_C0_TINT | LE_C0_INEA;
402 	return 0;
403 }
404 
405 static int lance_tx_buffs_avail(struct lance_private *lp)
406 {
407 	if (lp->tx_old <= lp->tx_new)
408 		return lp->tx_old + lp->tx_ring_mod_mask - lp->tx_new;
409 	return lp->tx_old - lp->tx_new - 1;
410 }
411 
412 static irqreturn_t lance_interrupt(int irq, void *dev_id)
413 {
414 	struct net_device *dev = dev_id;
415 	struct lance_private *lp = netdev_priv(dev);
416 	volatile struct lance_regs *ll = lp->ll;
417 	int csr0;
418 
419 	ll->rap = LE_CSR0;		/* LANCE Controller Status */
420 	csr0 = ll->rdp;
421 
422 	if (!(csr0 & LE_C0_INTR))	/* Check if any interrupt has */
423 		return IRQ_NONE;	/* been generated by the Lance. */
424 
425 	/* Acknowledge all the interrupt sources ASAP */
426 	ll->rdp = csr0 & ~(LE_C0_INEA | LE_C0_TDMD | LE_C0_STOP | LE_C0_STRT |
427 			   LE_C0_INIT);
428 
429 	if (csr0 & LE_C0_ERR) {
430 		/* Clear the error condition */
431 		ll->rdp = LE_C0_BABL | LE_C0_ERR | LE_C0_MISS | LE_C0_INEA;
432 	}
433 
434 	if (csr0 & LE_C0_RINT)
435 		lance_rx(dev);
436 
437 	if (csr0 & LE_C0_TINT)
438 		lance_tx(dev);
439 
440 	/* Log misc errors. */
441 	if (csr0 & LE_C0_BABL)
442 		dev->stats.tx_errors++;       /* Tx babble. */
443 	if (csr0 & LE_C0_MISS)
444 		dev->stats.rx_errors++;       /* Missed a Rx frame. */
445 	if (csr0 & LE_C0_MERR) {
446 		netdev_err(dev, "Bus master arbitration failure, status %04x\n",
447 			   csr0);
448 		/* Restart the chip. */
449 		ll->rdp = LE_C0_STRT;
450 	}
451 
452 	if (netif_queue_stopped(dev) && lance_tx_buffs_avail(lp) > 0)
453 		netif_wake_queue(dev);
454 
455 	ll->rap = LE_CSR0;
456 	ll->rdp = (LE_C0_BABL | LE_C0_CERR | LE_C0_MISS | LE_C0_MERR |
457 		   LE_C0_IDON | LE_C0_INEA);
458 	return IRQ_HANDLED;
459 }
460 
461 static int lance_open(struct net_device *dev)
462 {
463 	struct lance_private *lp = netdev_priv(dev);
464 	volatile struct lance_regs *ll = lp->ll;
465 	int ret;
466 
467 	/* Stop the Lance */
468 	ll->rap = LE_CSR0;
469 	ll->rdp = LE_C0_STOP;
470 
471 	/* Install the Interrupt handler */
472 	ret = request_irq(IRQ_AMIGA_PORTS, lance_interrupt, IRQF_SHARED,
473 			  dev->name, dev);
474 	if (ret)
475 		return ret;
476 
477 	load_csrs(lp);
478 	lance_init_ring(dev);
479 
480 	netif_start_queue(dev);
481 
482 	return init_restart_lance(lp);
483 }
484 
485 static int lance_close(struct net_device *dev)
486 {
487 	struct lance_private *lp = netdev_priv(dev);
488 	volatile struct lance_regs *ll = lp->ll;
489 
490 	netif_stop_queue(dev);
491 	del_timer_sync(&lp->multicast_timer);
492 
493 	/* Stop the card */
494 	ll->rap = LE_CSR0;
495 	ll->rdp = LE_C0_STOP;
496 
497 	free_irq(IRQ_AMIGA_PORTS, dev);
498 	return 0;
499 }
500 
501 static inline int lance_reset(struct net_device *dev)
502 {
503 	struct lance_private *lp = netdev_priv(dev);
504 	volatile struct lance_regs *ll = lp->ll;
505 	int status;
506 
507 	/* Stop the lance */
508 	ll->rap = LE_CSR0;
509 	ll->rdp = LE_C0_STOP;
510 
511 	load_csrs(lp);
512 
513 	lance_init_ring(dev);
514 	dev->trans_start = jiffies; /* prevent tx timeout */
515 	netif_start_queue(dev);
516 
517 	status = init_restart_lance(lp);
518 	netdev_dbg(dev, "Lance restart=%d\n", status);
519 
520 	return status;
521 }
522 
523 static void lance_tx_timeout(struct net_device *dev)
524 {
525 	struct lance_private *lp = netdev_priv(dev);
526 	volatile struct lance_regs *ll = lp->ll;
527 
528 	netdev_err(dev, "transmit timed out, status %04x, reset\n", ll->rdp);
529 	lance_reset(dev);
530 	netif_wake_queue(dev);
531 }
532 
533 static netdev_tx_t lance_start_xmit(struct sk_buff *skb,
534 				    struct net_device *dev)
535 {
536 	struct lance_private *lp = netdev_priv(dev);
537 	volatile struct lance_regs *ll = lp->ll;
538 	volatile struct lance_init_block *ib = lp->init_block;
539 	int entry, skblen;
540 	int status = NETDEV_TX_OK;
541 	unsigned long flags;
542 
543 	if (skb_padto(skb, ETH_ZLEN))
544 		return NETDEV_TX_OK;
545 	skblen = max_t(unsigned, skb->len, ETH_ZLEN);
546 
547 	local_irq_save(flags);
548 
549 	if (!lance_tx_buffs_avail(lp)) {
550 		local_irq_restore(flags);
551 		return NETDEV_TX_LOCKED;
552 	}
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 	dev_kfree_skb(skb);
576 
577 	local_irq_restore(flags);
578 
579 	return status;
580 }
581 
582 /* taken from the depca driver */
583 static void lance_load_multicast(struct net_device *dev)
584 {
585 	struct lance_private *lp = netdev_priv(dev);
586 	volatile struct lance_init_block *ib = lp->init_block;
587 	volatile u16 *mcast_table = (u16 *)&ib->filter;
588 	struct netdev_hw_addr *ha;
589 	u32 crc;
590 
591 	/* set all multicast bits */
592 	if (dev->flags & IFF_ALLMULTI) {
593 		ib->filter[0] = 0xffffffff;
594 		ib->filter[1] = 0xffffffff;
595 		return;
596 	}
597 	/* clear the multicast filter */
598 	ib->filter[0] = 0;
599 	ib->filter[1] = 0;
600 
601 	/* Add addresses */
602 	netdev_for_each_mc_addr(ha, dev) {
603 		crc = ether_crc_le(6, ha->addr);
604 		crc = crc >> 26;
605 		mcast_table[crc >> 4] |= 1 << (crc & 0xf);
606 	}
607 }
608 
609 static void lance_set_multicast(struct net_device *dev)
610 {
611 	struct lance_private *lp = netdev_priv(dev);
612 	volatile struct lance_init_block *ib = lp->init_block;
613 	volatile struct lance_regs *ll = lp->ll;
614 
615 	if (!netif_running(dev))
616 		return;
617 
618 	if (lp->tx_old != lp->tx_new) {
619 		mod_timer(&lp->multicast_timer, jiffies + 4);
620 		netif_wake_queue(dev);
621 		return;
622 	}
623 
624 	netif_stop_queue(dev);
625 
626 	ll->rap = LE_CSR0;
627 	ll->rdp = LE_C0_STOP;
628 	lance_init_ring(dev);
629 
630 	if (dev->flags & IFF_PROMISC) {
631 		ib->mode |= LE_MO_PROM;
632 	} else {
633 		ib->mode &= ~LE_MO_PROM;
634 		lance_load_multicast(dev);
635 	}
636 	load_csrs(lp);
637 	init_restart_lance(lp);
638 	netif_wake_queue(dev);
639 }
640 
641 static int a2065_init_one(struct zorro_dev *z,
642 			  const struct zorro_device_id *ent);
643 static void a2065_remove_one(struct zorro_dev *z);
644 
645 
646 static struct zorro_device_id a2065_zorro_tbl[] = {
647 	{ ZORRO_PROD_CBM_A2065_1 },
648 	{ ZORRO_PROD_CBM_A2065_2 },
649 	{ ZORRO_PROD_AMERISTAR_A2065 },
650 	{ 0 }
651 };
652 MODULE_DEVICE_TABLE(zorro, a2065_zorro_tbl);
653 
654 static struct zorro_driver a2065_driver = {
655 	.name		= "a2065",
656 	.id_table	= a2065_zorro_tbl,
657 	.probe		= a2065_init_one,
658 	.remove		= a2065_remove_one,
659 };
660 
661 static const struct net_device_ops lance_netdev_ops = {
662 	.ndo_open		= lance_open,
663 	.ndo_stop		= lance_close,
664 	.ndo_start_xmit		= lance_start_xmit,
665 	.ndo_tx_timeout		= lance_tx_timeout,
666 	.ndo_set_rx_mode	= lance_set_multicast,
667 	.ndo_validate_addr	= eth_validate_addr,
668 	.ndo_change_mtu		= eth_change_mtu,
669 	.ndo_set_mac_address	= eth_mac_addr,
670 };
671 
672 static int a2065_init_one(struct zorro_dev *z,
673 			  const struct zorro_device_id *ent)
674 {
675 	struct net_device *dev;
676 	struct lance_private *priv;
677 	unsigned long board = z->resource.start;
678 	unsigned long base_addr = board + A2065_LANCE;
679 	unsigned long mem_start = board + A2065_RAM;
680 	struct resource *r1, *r2;
681 	int err;
682 
683 	r1 = request_mem_region(base_addr, sizeof(struct lance_regs),
684 				"Am7990");
685 	if (!r1)
686 		return -EBUSY;
687 	r2 = request_mem_region(mem_start, A2065_RAM_SIZE, "RAM");
688 	if (!r2) {
689 		release_mem_region(base_addr, sizeof(struct lance_regs));
690 		return -EBUSY;
691 	}
692 
693 	dev = alloc_etherdev(sizeof(struct lance_private));
694 	if (dev == NULL) {
695 		release_mem_region(base_addr, sizeof(struct lance_regs));
696 		release_mem_region(mem_start, A2065_RAM_SIZE);
697 		return -ENOMEM;
698 	}
699 
700 	priv = netdev_priv(dev);
701 
702 	r1->name = dev->name;
703 	r2->name = dev->name;
704 
705 	dev->dev_addr[0] = 0x00;
706 	if (z->id != ZORRO_PROD_AMERISTAR_A2065) {	/* Commodore */
707 		dev->dev_addr[1] = 0x80;
708 		dev->dev_addr[2] = 0x10;
709 	} else {					/* Ameristar */
710 		dev->dev_addr[1] = 0x00;
711 		dev->dev_addr[2] = 0x9f;
712 	}
713 	dev->dev_addr[3] = (z->rom.er_SerialNumber >> 16) & 0xff;
714 	dev->dev_addr[4] = (z->rom.er_SerialNumber >> 8) & 0xff;
715 	dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
716 	dev->base_addr = ZTWO_VADDR(base_addr);
717 	dev->mem_start = ZTWO_VADDR(mem_start);
718 	dev->mem_end = dev->mem_start + A2065_RAM_SIZE;
719 
720 	priv->ll = (volatile struct lance_regs *)dev->base_addr;
721 	priv->init_block = (struct lance_init_block *)dev->mem_start;
722 	priv->lance_init_block = (struct lance_init_block *)A2065_RAM;
723 	priv->auto_select = 0;
724 	priv->busmaster_regval = LE_C3_BSWP;
725 
726 	priv->lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
727 	priv->lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
728 	priv->rx_ring_mod_mask = RX_RING_MOD_MASK;
729 	priv->tx_ring_mod_mask = TX_RING_MOD_MASK;
730 
731 	dev->netdev_ops = &lance_netdev_ops;
732 	dev->watchdog_timeo = 5*HZ;
733 	dev->dma = 0;
734 
735 	init_timer(&priv->multicast_timer);
736 	priv->multicast_timer.data = (unsigned long) dev;
737 	priv->multicast_timer.function =
738 		(void (*)(unsigned long))lance_set_multicast;
739 
740 	err = register_netdev(dev);
741 	if (err) {
742 		release_mem_region(base_addr, sizeof(struct lance_regs));
743 		release_mem_region(mem_start, A2065_RAM_SIZE);
744 		free_netdev(dev);
745 		return err;
746 	}
747 	zorro_set_drvdata(z, dev);
748 
749 	netdev_info(dev, "A2065 at 0x%08lx, Ethernet Address %pM\n",
750 		    board, dev->dev_addr);
751 
752 	return 0;
753 }
754 
755 
756 static void a2065_remove_one(struct zorro_dev *z)
757 {
758 	struct net_device *dev = zorro_get_drvdata(z);
759 
760 	unregister_netdev(dev);
761 	release_mem_region(ZTWO_PADDR(dev->base_addr),
762 			   sizeof(struct lance_regs));
763 	release_mem_region(ZTWO_PADDR(dev->mem_start), A2065_RAM_SIZE);
764 	free_netdev(dev);
765 }
766 
767 static int __init a2065_init_module(void)
768 {
769 	return zorro_register_driver(&a2065_driver);
770 }
771 
772 static void __exit a2065_cleanup_module(void)
773 {
774 	zorro_unregister_driver(&a2065_driver);
775 }
776 
777 module_init(a2065_init_module);
778 module_exit(a2065_cleanup_module);
779 
780 MODULE_LICENSE("GPL");
781