1 /*
2  * sonic.c
3  *
4  * (C) 2005 Finn Thain
5  *
6  * Converted to DMA API, added zero-copy buffer handling, and
7  * (from the mac68k project) introduced dhd's support for 16-bit cards.
8  *
9  * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
10  *
11  * This driver is based on work from Andreas Busse, but most of
12  * the code is rewritten.
13  *
14  * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
15  *
16  *    Core code included by system sonic drivers
17  *
18  * And... partially rewritten again by David Huggins-Daines in order
19  * to cope with screwed up Macintosh NICs that may or may not use
20  * 16-bit DMA.
21  *
22  * (C) 1999 David Huggins-Daines <dhd@debian.org>
23  *
24  */
25 
26 /*
27  * Sources: Olivetti M700-10 Risc Personal Computer hardware handbook,
28  * National Semiconductors data sheet for the DP83932B Sonic Ethernet
29  * controller, and the files "8390.c" and "skeleton.c" in this directory.
30  *
31  * Additional sources: Nat Semi data sheet for the DP83932C and Nat Semi
32  * Application Note AN-746, the files "lance.c" and "ibmlana.c". See also
33  * the NetBSD file "sys/arch/mac68k/dev/if_sn.c".
34  */
35 
36 
37 
38 /*
39  * Open/initialize the SONIC controller.
40  *
41  * This routine should set everything up anew at each open, even
42  *  registers that "should" only need to be set once at boot, so that
43  *  there is non-reboot way to recover if something goes wrong.
44  */
45 static int sonic_open(struct net_device *dev)
46 {
47 	struct sonic_local *lp = netdev_priv(dev);
48 	int i;
49 
50 	if (sonic_debug > 2)
51 		printk("sonic_open: initializing sonic driver.\n");
52 
53 	for (i = 0; i < SONIC_NUM_RRS; i++) {
54 		struct sk_buff *skb = netdev_alloc_skb(dev, SONIC_RBSIZE + 2);
55 		if (skb == NULL) {
56 			while(i > 0) { /* free any that were allocated successfully */
57 				i--;
58 				dev_kfree_skb(lp->rx_skb[i]);
59 				lp->rx_skb[i] = NULL;
60 			}
61 			printk(KERN_ERR "%s: couldn't allocate receive buffers\n",
62 			       dev->name);
63 			return -ENOMEM;
64 		}
65 		/* align IP header unless DMA requires otherwise */
66 		if (SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
67 			skb_reserve(skb, 2);
68 		lp->rx_skb[i] = skb;
69 	}
70 
71 	for (i = 0; i < SONIC_NUM_RRS; i++) {
72 		dma_addr_t laddr = dma_map_single(lp->device, skb_put(lp->rx_skb[i], SONIC_RBSIZE),
73 		                                  SONIC_RBSIZE, DMA_FROM_DEVICE);
74 		if (!laddr) {
75 			while(i > 0) { /* free any that were mapped successfully */
76 				i--;
77 				dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
78 				lp->rx_laddr[i] = (dma_addr_t)0;
79 			}
80 			for (i = 0; i < SONIC_NUM_RRS; i++) {
81 				dev_kfree_skb(lp->rx_skb[i]);
82 				lp->rx_skb[i] = NULL;
83 			}
84 			printk(KERN_ERR "%s: couldn't map rx DMA buffers\n",
85 			       dev->name);
86 			return -ENOMEM;
87 		}
88 		lp->rx_laddr[i] = laddr;
89 	}
90 
91 	/*
92 	 * Initialize the SONIC
93 	 */
94 	sonic_init(dev);
95 
96 	netif_start_queue(dev);
97 
98 	if (sonic_debug > 2)
99 		printk("sonic_open: Initialization done.\n");
100 
101 	return 0;
102 }
103 
104 
105 /*
106  * Close the SONIC device
107  */
108 static int sonic_close(struct net_device *dev)
109 {
110 	struct sonic_local *lp = netdev_priv(dev);
111 	int i;
112 
113 	if (sonic_debug > 2)
114 		printk("sonic_close\n");
115 
116 	netif_stop_queue(dev);
117 
118 	/*
119 	 * stop the SONIC, disable interrupts
120 	 */
121 	SONIC_WRITE(SONIC_IMR, 0);
122 	SONIC_WRITE(SONIC_ISR, 0x7fff);
123 	SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
124 
125 	/* unmap and free skbs that haven't been transmitted */
126 	for (i = 0; i < SONIC_NUM_TDS; i++) {
127 		if(lp->tx_laddr[i]) {
128 			dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
129 			lp->tx_laddr[i] = (dma_addr_t)0;
130 		}
131 		if(lp->tx_skb[i]) {
132 			dev_kfree_skb(lp->tx_skb[i]);
133 			lp->tx_skb[i] = NULL;
134 		}
135 	}
136 
137 	/* unmap and free the receive buffers */
138 	for (i = 0; i < SONIC_NUM_RRS; i++) {
139 		if(lp->rx_laddr[i]) {
140 			dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
141 			lp->rx_laddr[i] = (dma_addr_t)0;
142 		}
143 		if(lp->rx_skb[i]) {
144 			dev_kfree_skb(lp->rx_skb[i]);
145 			lp->rx_skb[i] = NULL;
146 		}
147 	}
148 
149 	return 0;
150 }
151 
152 static void sonic_tx_timeout(struct net_device *dev)
153 {
154 	struct sonic_local *lp = netdev_priv(dev);
155 	int i;
156 	/*
157 	 * put the Sonic into software-reset mode and
158 	 * disable all interrupts before releasing DMA buffers
159 	 */
160 	SONIC_WRITE(SONIC_IMR, 0);
161 	SONIC_WRITE(SONIC_ISR, 0x7fff);
162 	SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
163 	/* We could resend the original skbs. Easier to re-initialise. */
164 	for (i = 0; i < SONIC_NUM_TDS; i++) {
165 		if(lp->tx_laddr[i]) {
166 			dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
167 			lp->tx_laddr[i] = (dma_addr_t)0;
168 		}
169 		if(lp->tx_skb[i]) {
170 			dev_kfree_skb(lp->tx_skb[i]);
171 			lp->tx_skb[i] = NULL;
172 		}
173 	}
174 	/* Try to restart the adaptor. */
175 	sonic_init(dev);
176 	lp->stats.tx_errors++;
177 	dev->trans_start = jiffies; /* prevent tx timeout */
178 	netif_wake_queue(dev);
179 }
180 
181 /*
182  * transmit packet
183  *
184  * Appends new TD during transmission thus avoiding any TX interrupts
185  * until we run out of TDs.
186  * This routine interacts closely with the ISR in that it may,
187  *   set tx_skb[i]
188  *   reset the status flags of the new TD
189  *   set and reset EOL flags
190  *   stop the tx queue
191  * The ISR interacts with this routine in various ways. It may,
192  *   reset tx_skb[i]
193  *   test the EOL and status flags of the TDs
194  *   wake the tx queue
195  * Concurrently with all of this, the SONIC is potentially writing to
196  * the status flags of the TDs.
197  * Until some mutual exclusion is added, this code will not work with SMP. However,
198  * MIPS Jazz machines and m68k Macs were all uni-processor machines.
199  */
200 
201 static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
202 {
203 	struct sonic_local *lp = netdev_priv(dev);
204 	dma_addr_t laddr;
205 	int length;
206 	int entry = lp->next_tx;
207 
208 	if (sonic_debug > 2)
209 		printk("sonic_send_packet: skb=%p, dev=%p\n", skb, dev);
210 
211 	length = skb->len;
212 	if (length < ETH_ZLEN) {
213 		if (skb_padto(skb, ETH_ZLEN))
214 			return NETDEV_TX_OK;
215 		length = ETH_ZLEN;
216 	}
217 
218 	/*
219 	 * Map the packet data into the logical DMA address space
220 	 */
221 
222 	laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE);
223 	if (!laddr) {
224 		printk(KERN_ERR "%s: failed to map tx DMA buffer.\n", dev->name);
225 		dev_kfree_skb(skb);
226 		return NETDEV_TX_BUSY;
227 	}
228 
229 	sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0);       /* clear status */
230 	sonic_tda_put(dev, entry, SONIC_TD_FRAG_COUNT, 1);   /* single fragment */
231 	sonic_tda_put(dev, entry, SONIC_TD_PKTSIZE, length); /* length of packet */
232 	sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_L, laddr & 0xffff);
233 	sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_H, laddr >> 16);
234 	sonic_tda_put(dev, entry, SONIC_TD_FRAG_SIZE, length);
235 	sonic_tda_put(dev, entry, SONIC_TD_LINK,
236 		sonic_tda_get(dev, entry, SONIC_TD_LINK) | SONIC_EOL);
237 
238 	/*
239 	 * Must set tx_skb[entry] only after clearing status, and
240 	 * before clearing EOL and before stopping queue
241 	 */
242 	wmb();
243 	lp->tx_len[entry] = length;
244 	lp->tx_laddr[entry] = laddr;
245 	lp->tx_skb[entry] = skb;
246 
247 	wmb();
248 	sonic_tda_put(dev, lp->eol_tx, SONIC_TD_LINK,
249 				  sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK) & ~SONIC_EOL);
250 	lp->eol_tx = entry;
251 
252 	lp->next_tx = (entry + 1) & SONIC_TDS_MASK;
253 	if (lp->tx_skb[lp->next_tx] != NULL) {
254 		/* The ring is full, the ISR has yet to process the next TD. */
255 		if (sonic_debug > 3)
256 			printk("%s: stopping queue\n", dev->name);
257 		netif_stop_queue(dev);
258 		/* after this packet, wait for ISR to free up some TDAs */
259 	} else netif_start_queue(dev);
260 
261 	if (sonic_debug > 2)
262 		printk("sonic_send_packet: issuing Tx command\n");
263 
264 	SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);
265 
266 	return NETDEV_TX_OK;
267 }
268 
269 /*
270  * The typical workload of the driver:
271  * Handle the network interface interrupts.
272  */
273 static irqreturn_t sonic_interrupt(int irq, void *dev_id)
274 {
275 	struct net_device *dev = dev_id;
276 	struct sonic_local *lp = netdev_priv(dev);
277 	int status;
278 
279 	if (!(status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT))
280 		return IRQ_NONE;
281 
282 	do {
283 		if (status & SONIC_INT_PKTRX) {
284 			if (sonic_debug > 2)
285 				printk("%s: packet rx\n", dev->name);
286 			sonic_rx(dev);	/* got packet(s) */
287 			SONIC_WRITE(SONIC_ISR, SONIC_INT_PKTRX); /* clear the interrupt */
288 		}
289 
290 		if (status & SONIC_INT_TXDN) {
291 			int entry = lp->cur_tx;
292 			int td_status;
293 			int freed_some = 0;
294 
295 			/* At this point, cur_tx is the index of a TD that is one of:
296 			 *   unallocated/freed                          (status set   & tx_skb[entry] clear)
297 			 *   allocated and sent                         (status set   & tx_skb[entry] set  )
298 			 *   allocated and not yet sent                 (status clear & tx_skb[entry] set  )
299 			 *   still being allocated by sonic_send_packet (status clear & tx_skb[entry] clear)
300 			 */
301 
302 			if (sonic_debug > 2)
303 				printk("%s: tx done\n", dev->name);
304 
305 			while (lp->tx_skb[entry] != NULL) {
306 				if ((td_status = sonic_tda_get(dev, entry, SONIC_TD_STATUS)) == 0)
307 					break;
308 
309 				if (td_status & 0x0001) {
310 					lp->stats.tx_packets++;
311 					lp->stats.tx_bytes += sonic_tda_get(dev, entry, SONIC_TD_PKTSIZE);
312 				} else {
313 					lp->stats.tx_errors++;
314 					if (td_status & 0x0642)
315 						lp->stats.tx_aborted_errors++;
316 					if (td_status & 0x0180)
317 						lp->stats.tx_carrier_errors++;
318 					if (td_status & 0x0020)
319 						lp->stats.tx_window_errors++;
320 					if (td_status & 0x0004)
321 						lp->stats.tx_fifo_errors++;
322 				}
323 
324 				/* We must free the original skb */
325 				dev_kfree_skb_irq(lp->tx_skb[entry]);
326 				lp->tx_skb[entry] = NULL;
327 				/* and unmap DMA buffer */
328 				dma_unmap_single(lp->device, lp->tx_laddr[entry], lp->tx_len[entry], DMA_TO_DEVICE);
329 				lp->tx_laddr[entry] = (dma_addr_t)0;
330 				freed_some = 1;
331 
332 				if (sonic_tda_get(dev, entry, SONIC_TD_LINK) & SONIC_EOL) {
333 					entry = (entry + 1) & SONIC_TDS_MASK;
334 					break;
335 				}
336 				entry = (entry + 1) & SONIC_TDS_MASK;
337 			}
338 
339 			if (freed_some || lp->tx_skb[entry] == NULL)
340 				netif_wake_queue(dev);  /* The ring is no longer full */
341 			lp->cur_tx = entry;
342 			SONIC_WRITE(SONIC_ISR, SONIC_INT_TXDN); /* clear the interrupt */
343 		}
344 
345 		/*
346 		 * check error conditions
347 		 */
348 		if (status & SONIC_INT_RFO) {
349 			if (sonic_debug > 1)
350 				printk("%s: rx fifo overrun\n", dev->name);
351 			lp->stats.rx_fifo_errors++;
352 			SONIC_WRITE(SONIC_ISR, SONIC_INT_RFO); /* clear the interrupt */
353 		}
354 		if (status & SONIC_INT_RDE) {
355 			if (sonic_debug > 1)
356 				printk("%s: rx descriptors exhausted\n", dev->name);
357 			lp->stats.rx_dropped++;
358 			SONIC_WRITE(SONIC_ISR, SONIC_INT_RDE); /* clear the interrupt */
359 		}
360 		if (status & SONIC_INT_RBAE) {
361 			if (sonic_debug > 1)
362 				printk("%s: rx buffer area exceeded\n", dev->name);
363 			lp->stats.rx_dropped++;
364 			SONIC_WRITE(SONIC_ISR, SONIC_INT_RBAE); /* clear the interrupt */
365 		}
366 
367 		/* counter overruns; all counters are 16bit wide */
368 		if (status & SONIC_INT_FAE) {
369 			lp->stats.rx_frame_errors += 65536;
370 			SONIC_WRITE(SONIC_ISR, SONIC_INT_FAE); /* clear the interrupt */
371 		}
372 		if (status & SONIC_INT_CRC) {
373 			lp->stats.rx_crc_errors += 65536;
374 			SONIC_WRITE(SONIC_ISR, SONIC_INT_CRC); /* clear the interrupt */
375 		}
376 		if (status & SONIC_INT_MP) {
377 			lp->stats.rx_missed_errors += 65536;
378 			SONIC_WRITE(SONIC_ISR, SONIC_INT_MP); /* clear the interrupt */
379 		}
380 
381 		/* transmit error */
382 		if (status & SONIC_INT_TXER) {
383 			if ((SONIC_READ(SONIC_TCR) & SONIC_TCR_FU) && (sonic_debug > 2))
384 				printk(KERN_ERR "%s: tx fifo underrun\n", dev->name);
385 			SONIC_WRITE(SONIC_ISR, SONIC_INT_TXER); /* clear the interrupt */
386 		}
387 
388 		/* bus retry */
389 		if (status & SONIC_INT_BR) {
390 			printk(KERN_ERR "%s: Bus retry occurred! Device interrupt disabled.\n",
391 				dev->name);
392 			/* ... to help debug DMA problems causing endless interrupts. */
393 			/* Bounce the eth interface to turn on the interrupt again. */
394 			SONIC_WRITE(SONIC_IMR, 0);
395 			SONIC_WRITE(SONIC_ISR, SONIC_INT_BR); /* clear the interrupt */
396 		}
397 
398 		/* load CAM done */
399 		if (status & SONIC_INT_LCD)
400 			SONIC_WRITE(SONIC_ISR, SONIC_INT_LCD); /* clear the interrupt */
401 	} while((status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT));
402 	return IRQ_HANDLED;
403 }
404 
405 /*
406  * We have a good packet(s), pass it/them up the network stack.
407  */
408 static void sonic_rx(struct net_device *dev)
409 {
410 	struct sonic_local *lp = netdev_priv(dev);
411 	int status;
412 	int entry = lp->cur_rx;
413 
414 	while (sonic_rda_get(dev, entry, SONIC_RD_IN_USE) == 0) {
415 		struct sk_buff *used_skb;
416 		struct sk_buff *new_skb;
417 		dma_addr_t new_laddr;
418 		u16 bufadr_l;
419 		u16 bufadr_h;
420 		int pkt_len;
421 
422 		status = sonic_rda_get(dev, entry, SONIC_RD_STATUS);
423 		if (status & SONIC_RCR_PRX) {
424 			/* Malloc up new buffer. */
425 			new_skb = netdev_alloc_skb(dev, SONIC_RBSIZE + 2);
426 			if (new_skb == NULL) {
427 				lp->stats.rx_dropped++;
428 				break;
429 			}
430 			/* provide 16 byte IP header alignment unless DMA requires otherwise */
431 			if(SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
432 				skb_reserve(new_skb, 2);
433 
434 			new_laddr = dma_map_single(lp->device, skb_put(new_skb, SONIC_RBSIZE),
435 		                               SONIC_RBSIZE, DMA_FROM_DEVICE);
436 			if (!new_laddr) {
437 				dev_kfree_skb(new_skb);
438 				printk(KERN_ERR "%s: Failed to map rx buffer, dropping packet.\n", dev->name);
439 				lp->stats.rx_dropped++;
440 				break;
441 			}
442 
443 			/* now we have a new skb to replace it, pass the used one up the stack */
444 			dma_unmap_single(lp->device, lp->rx_laddr[entry], SONIC_RBSIZE, DMA_FROM_DEVICE);
445 			used_skb = lp->rx_skb[entry];
446 			pkt_len = sonic_rda_get(dev, entry, SONIC_RD_PKTLEN);
447 			skb_trim(used_skb, pkt_len);
448 			used_skb->protocol = eth_type_trans(used_skb, dev);
449 			netif_rx(used_skb);
450 			lp->stats.rx_packets++;
451 			lp->stats.rx_bytes += pkt_len;
452 
453 			/* and insert the new skb */
454 			lp->rx_laddr[entry] = new_laddr;
455 			lp->rx_skb[entry] = new_skb;
456 
457 			bufadr_l = (unsigned long)new_laddr & 0xffff;
458 			bufadr_h = (unsigned long)new_laddr >> 16;
459 			sonic_rra_put(dev, entry, SONIC_RR_BUFADR_L, bufadr_l);
460 			sonic_rra_put(dev, entry, SONIC_RR_BUFADR_H, bufadr_h);
461 		} else {
462 			/* This should only happen, if we enable accepting broken packets. */
463 			lp->stats.rx_errors++;
464 			if (status & SONIC_RCR_FAER)
465 				lp->stats.rx_frame_errors++;
466 			if (status & SONIC_RCR_CRCR)
467 				lp->stats.rx_crc_errors++;
468 		}
469 		if (status & SONIC_RCR_LPKT) {
470 			/*
471 			 * this was the last packet out of the current receive buffer
472 			 * give the buffer back to the SONIC
473 			 */
474 			lp->cur_rwp += SIZEOF_SONIC_RR * SONIC_BUS_SCALE(lp->dma_bitmode);
475 			if (lp->cur_rwp >= lp->rra_end) lp->cur_rwp = lp->rra_laddr & 0xffff;
476 			SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
477 			if (SONIC_READ(SONIC_ISR) & SONIC_INT_RBE) {
478 				if (sonic_debug > 2)
479 					printk("%s: rx buffer exhausted\n", dev->name);
480 				SONIC_WRITE(SONIC_ISR, SONIC_INT_RBE); /* clear the flag */
481 			}
482 		} else
483 			printk(KERN_ERR "%s: rx desc without RCR_LPKT. Shouldn't happen !?\n",
484 			     dev->name);
485 		/*
486 		 * give back the descriptor
487 		 */
488 		sonic_rda_put(dev, entry, SONIC_RD_LINK,
489 			sonic_rda_get(dev, entry, SONIC_RD_LINK) | SONIC_EOL);
490 		sonic_rda_put(dev, entry, SONIC_RD_IN_USE, 1);
491 		sonic_rda_put(dev, lp->eol_rx, SONIC_RD_LINK,
492 			sonic_rda_get(dev, lp->eol_rx, SONIC_RD_LINK) & ~SONIC_EOL);
493 		lp->eol_rx = entry;
494 		lp->cur_rx = entry = (entry + 1) & SONIC_RDS_MASK;
495 	}
496 	/*
497 	 * If any worth-while packets have been received, netif_rx()
498 	 * has done a mark_bh(NET_BH) for us and will work on them
499 	 * when we get to the bottom-half routine.
500 	 */
501 }
502 
503 
504 /*
505  * Get the current statistics.
506  * This may be called with the device open or closed.
507  */
508 static struct net_device_stats *sonic_get_stats(struct net_device *dev)
509 {
510 	struct sonic_local *lp = netdev_priv(dev);
511 
512 	/* read the tally counter from the SONIC and reset them */
513 	lp->stats.rx_crc_errors += SONIC_READ(SONIC_CRCT);
514 	SONIC_WRITE(SONIC_CRCT, 0xffff);
515 	lp->stats.rx_frame_errors += SONIC_READ(SONIC_FAET);
516 	SONIC_WRITE(SONIC_FAET, 0xffff);
517 	lp->stats.rx_missed_errors += SONIC_READ(SONIC_MPT);
518 	SONIC_WRITE(SONIC_MPT, 0xffff);
519 
520 	return &lp->stats;
521 }
522 
523 
524 /*
525  * Set or clear the multicast filter for this adaptor.
526  */
527 static void sonic_multicast_list(struct net_device *dev)
528 {
529 	struct sonic_local *lp = netdev_priv(dev);
530 	unsigned int rcr;
531 	struct netdev_hw_addr *ha;
532 	unsigned char *addr;
533 	int i;
534 
535 	rcr = SONIC_READ(SONIC_RCR) & ~(SONIC_RCR_PRO | SONIC_RCR_AMC);
536 	rcr |= SONIC_RCR_BRD;	/* accept broadcast packets */
537 
538 	if (dev->flags & IFF_PROMISC) {	/* set promiscuous mode */
539 		rcr |= SONIC_RCR_PRO;
540 	} else {
541 		if ((dev->flags & IFF_ALLMULTI) ||
542 		    (netdev_mc_count(dev) > 15)) {
543 			rcr |= SONIC_RCR_AMC;
544 		} else {
545 			if (sonic_debug > 2)
546 				printk("sonic_multicast_list: mc_count %d\n",
547 				       netdev_mc_count(dev));
548 			sonic_set_cam_enable(dev, 1);  /* always enable our own address */
549 			i = 1;
550 			netdev_for_each_mc_addr(ha, dev) {
551 				addr = ha->addr;
552 				sonic_cda_put(dev, i, SONIC_CD_CAP0, addr[1] << 8 | addr[0]);
553 				sonic_cda_put(dev, i, SONIC_CD_CAP1, addr[3] << 8 | addr[2]);
554 				sonic_cda_put(dev, i, SONIC_CD_CAP2, addr[5] << 8 | addr[4]);
555 				sonic_set_cam_enable(dev, sonic_get_cam_enable(dev) | (1 << i));
556 				i++;
557 			}
558 			SONIC_WRITE(SONIC_CDC, 16);
559 			/* issue Load CAM command */
560 			SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
561 			SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
562 		}
563 	}
564 
565 	if (sonic_debug > 2)
566 		printk("sonic_multicast_list: setting RCR=%x\n", rcr);
567 
568 	SONIC_WRITE(SONIC_RCR, rcr);
569 }
570 
571 
572 /*
573  * Initialize the SONIC ethernet controller.
574  */
575 static int sonic_init(struct net_device *dev)
576 {
577 	unsigned int cmd;
578 	struct sonic_local *lp = netdev_priv(dev);
579 	int i;
580 
581 	/*
582 	 * put the Sonic into software-reset mode and
583 	 * disable all interrupts
584 	 */
585 	SONIC_WRITE(SONIC_IMR, 0);
586 	SONIC_WRITE(SONIC_ISR, 0x7fff);
587 	SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
588 
589 	/*
590 	 * clear software reset flag, disable receiver, clear and
591 	 * enable interrupts, then completely initialize the SONIC
592 	 */
593 	SONIC_WRITE(SONIC_CMD, 0);
594 	SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS);
595 
596 	/*
597 	 * initialize the receive resource area
598 	 */
599 	if (sonic_debug > 2)
600 		printk("sonic_init: initialize receive resource area\n");
601 
602 	for (i = 0; i < SONIC_NUM_RRS; i++) {
603 		u16 bufadr_l = (unsigned long)lp->rx_laddr[i] & 0xffff;
604 		u16 bufadr_h = (unsigned long)lp->rx_laddr[i] >> 16;
605 		sonic_rra_put(dev, i, SONIC_RR_BUFADR_L, bufadr_l);
606 		sonic_rra_put(dev, i, SONIC_RR_BUFADR_H, bufadr_h);
607 		sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_L, SONIC_RBSIZE >> 1);
608 		sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_H, 0);
609 	}
610 
611 	/* initialize all RRA registers */
612 	lp->rra_end = (lp->rra_laddr + SONIC_NUM_RRS * SIZEOF_SONIC_RR *
613 					SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
614 	lp->cur_rwp = (lp->rra_laddr + (SONIC_NUM_RRS - 1) * SIZEOF_SONIC_RR *
615 					SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
616 
617 	SONIC_WRITE(SONIC_RSA, lp->rra_laddr & 0xffff);
618 	SONIC_WRITE(SONIC_REA, lp->rra_end);
619 	SONIC_WRITE(SONIC_RRP, lp->rra_laddr & 0xffff);
620 	SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
621 	SONIC_WRITE(SONIC_URRA, lp->rra_laddr >> 16);
622 	SONIC_WRITE(SONIC_EOBC, (SONIC_RBSIZE >> 1) - (lp->dma_bitmode ? 2 : 1));
623 
624 	/* load the resource pointers */
625 	if (sonic_debug > 3)
626 		printk("sonic_init: issuing RRRA command\n");
627 
628 	SONIC_WRITE(SONIC_CMD, SONIC_CR_RRRA);
629 	i = 0;
630 	while (i++ < 100) {
631 		if (SONIC_READ(SONIC_CMD) & SONIC_CR_RRRA)
632 			break;
633 	}
634 
635 	if (sonic_debug > 2)
636 		printk("sonic_init: status=%x i=%d\n", SONIC_READ(SONIC_CMD), i);
637 
638 	/*
639 	 * Initialize the receive descriptors so that they
640 	 * become a circular linked list, ie. let the last
641 	 * descriptor point to the first again.
642 	 */
643 	if (sonic_debug > 2)
644 		printk("sonic_init: initialize receive descriptors\n");
645 	for (i=0; i<SONIC_NUM_RDS; i++) {
646 		sonic_rda_put(dev, i, SONIC_RD_STATUS, 0);
647 		sonic_rda_put(dev, i, SONIC_RD_PKTLEN, 0);
648 		sonic_rda_put(dev, i, SONIC_RD_PKTPTR_L, 0);
649 		sonic_rda_put(dev, i, SONIC_RD_PKTPTR_H, 0);
650 		sonic_rda_put(dev, i, SONIC_RD_SEQNO, 0);
651 		sonic_rda_put(dev, i, SONIC_RD_IN_USE, 1);
652 		sonic_rda_put(dev, i, SONIC_RD_LINK,
653 			lp->rda_laddr +
654 			((i+1) * SIZEOF_SONIC_RD * SONIC_BUS_SCALE(lp->dma_bitmode)));
655 	}
656 	/* fix last descriptor */
657 	sonic_rda_put(dev, SONIC_NUM_RDS - 1, SONIC_RD_LINK,
658 		(lp->rda_laddr & 0xffff) | SONIC_EOL);
659 	lp->eol_rx = SONIC_NUM_RDS - 1;
660 	lp->cur_rx = 0;
661 	SONIC_WRITE(SONIC_URDA, lp->rda_laddr >> 16);
662 	SONIC_WRITE(SONIC_CRDA, lp->rda_laddr & 0xffff);
663 
664 	/*
665 	 * initialize transmit descriptors
666 	 */
667 	if (sonic_debug > 2)
668 		printk("sonic_init: initialize transmit descriptors\n");
669 	for (i = 0; i < SONIC_NUM_TDS; i++) {
670 		sonic_tda_put(dev, i, SONIC_TD_STATUS, 0);
671 		sonic_tda_put(dev, i, SONIC_TD_CONFIG, 0);
672 		sonic_tda_put(dev, i, SONIC_TD_PKTSIZE, 0);
673 		sonic_tda_put(dev, i, SONIC_TD_FRAG_COUNT, 0);
674 		sonic_tda_put(dev, i, SONIC_TD_LINK,
675 			(lp->tda_laddr & 0xffff) +
676 			(i + 1) * SIZEOF_SONIC_TD * SONIC_BUS_SCALE(lp->dma_bitmode));
677 		lp->tx_skb[i] = NULL;
678 	}
679 	/* fix last descriptor */
680 	sonic_tda_put(dev, SONIC_NUM_TDS - 1, SONIC_TD_LINK,
681 		(lp->tda_laddr & 0xffff));
682 
683 	SONIC_WRITE(SONIC_UTDA, lp->tda_laddr >> 16);
684 	SONIC_WRITE(SONIC_CTDA, lp->tda_laddr & 0xffff);
685 	lp->cur_tx = lp->next_tx = 0;
686 	lp->eol_tx = SONIC_NUM_TDS - 1;
687 
688 	/*
689 	 * put our own address to CAM desc[0]
690 	 */
691 	sonic_cda_put(dev, 0, SONIC_CD_CAP0, dev->dev_addr[1] << 8 | dev->dev_addr[0]);
692 	sonic_cda_put(dev, 0, SONIC_CD_CAP1, dev->dev_addr[3] << 8 | dev->dev_addr[2]);
693 	sonic_cda_put(dev, 0, SONIC_CD_CAP2, dev->dev_addr[5] << 8 | dev->dev_addr[4]);
694 	sonic_set_cam_enable(dev, 1);
695 
696 	for (i = 0; i < 16; i++)
697 		sonic_cda_put(dev, i, SONIC_CD_ENTRY_POINTER, i);
698 
699 	/*
700 	 * initialize CAM registers
701 	 */
702 	SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
703 	SONIC_WRITE(SONIC_CDC, 16);
704 
705 	/*
706 	 * load the CAM
707 	 */
708 	SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
709 
710 	i = 0;
711 	while (i++ < 100) {
712 		if (SONIC_READ(SONIC_ISR) & SONIC_INT_LCD)
713 			break;
714 	}
715 	if (sonic_debug > 2) {
716 		printk("sonic_init: CMD=%x, ISR=%x\n, i=%d",
717 		       SONIC_READ(SONIC_CMD), SONIC_READ(SONIC_ISR), i);
718 	}
719 
720 	/*
721 	 * enable receiver, disable loopback
722 	 * and enable all interrupts
723 	 */
724 	SONIC_WRITE(SONIC_CMD, SONIC_CR_RXEN | SONIC_CR_STP);
725 	SONIC_WRITE(SONIC_RCR, SONIC_RCR_DEFAULT);
726 	SONIC_WRITE(SONIC_TCR, SONIC_TCR_DEFAULT);
727 	SONIC_WRITE(SONIC_ISR, 0x7fff);
728 	SONIC_WRITE(SONIC_IMR, SONIC_IMR_DEFAULT);
729 
730 	cmd = SONIC_READ(SONIC_CMD);
731 	if ((cmd & SONIC_CR_RXEN) == 0 || (cmd & SONIC_CR_STP) == 0)
732 		printk(KERN_ERR "sonic_init: failed, status=%x\n", cmd);
733 
734 	if (sonic_debug > 2)
735 		printk("sonic_init: new status=%x\n",
736 		       SONIC_READ(SONIC_CMD));
737 
738 	return 0;
739 }
740 
741 MODULE_LICENSE("GPL");
742