Merge mulgrave-w:git/linux-2.6
[linux-2.6] / drivers / net / sonic.c
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         /*
54          * We don't need to deal with auto-irq stuff since we
55          * hardwire the sonic interrupt.
56          */
57 /*
58  * XXX Horrible work around:  We install sonic_interrupt as fast interrupt.
59  * This means that during execution of the handler interrupt are disabled
60  * covering another bug otherwise corrupting data.  This doesn't mean
61  * this glue works ok under all situations.
62  *
63  * Note (dhd): this also appears to prevent lockups on the Macintrash
64  * when more than one Ethernet card is installed (knock on wood)
65  *
66  * Note (fthain): whether the above is still true is anyones guess. Certainly
67  * the buffer handling algorithms will not tolerate re-entrance without some
68  * mutual exclusion added. Anyway, the memcpy has now been eliminated from the
69  * rx code to make this a faster "fast interrupt".
70  */
71         if (request_irq(dev->irq, &sonic_interrupt, SONIC_IRQ_FLAG, "sonic", dev)) {
72                 printk(KERN_ERR "\n%s: unable to get IRQ %d .\n", dev->name, dev->irq);
73                 return -EAGAIN;
74         }
75
76         for (i = 0; i < SONIC_NUM_RRS; i++) {
77                 struct sk_buff *skb = dev_alloc_skb(SONIC_RBSIZE + 2);
78                 if (skb == NULL) {
79                         while(i > 0) { /* free any that were allocated successfully */
80                                 i--;
81                                 dev_kfree_skb(lp->rx_skb[i]);
82                                 lp->rx_skb[i] = NULL;
83                         }
84                         printk(KERN_ERR "%s: couldn't allocate receive buffers\n",
85                                dev->name);
86                         return -ENOMEM;
87                 }
88                 skb->dev = dev;
89                 /* align IP header unless DMA requires otherwise */
90                 if (SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
91                         skb_reserve(skb, 2);
92                 lp->rx_skb[i] = skb;
93         }
94
95         for (i = 0; i < SONIC_NUM_RRS; i++) {
96                 dma_addr_t laddr = dma_map_single(lp->device, skb_put(lp->rx_skb[i], SONIC_RBSIZE),
97                                                   SONIC_RBSIZE, DMA_FROM_DEVICE);
98                 if (!laddr) {
99                         while(i > 0) { /* free any that were mapped successfully */
100                                 i--;
101                                 dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
102                                 lp->rx_laddr[i] = (dma_addr_t)0;
103                         }
104                         for (i = 0; i < SONIC_NUM_RRS; i++) {
105                                 dev_kfree_skb(lp->rx_skb[i]);
106                                 lp->rx_skb[i] = NULL;
107                         }
108                         printk(KERN_ERR "%s: couldn't map rx DMA buffers\n",
109                                dev->name);
110                         return -ENOMEM;
111                 }
112                 lp->rx_laddr[i] = laddr;
113         }
114
115         /*
116          * Initialize the SONIC
117          */
118         sonic_init(dev);
119
120         netif_start_queue(dev);
121
122         if (sonic_debug > 2)
123                 printk("sonic_open: Initialization done.\n");
124
125         return 0;
126 }
127
128
129 /*
130  * Close the SONIC device
131  */
132 static int sonic_close(struct net_device *dev)
133 {
134         struct sonic_local *lp = netdev_priv(dev);
135         int i;
136
137         if (sonic_debug > 2)
138                 printk("sonic_close\n");
139
140         netif_stop_queue(dev);
141
142         /*
143          * stop the SONIC, disable interrupts
144          */
145         SONIC_WRITE(SONIC_IMR, 0);
146         SONIC_WRITE(SONIC_ISR, 0x7fff);
147         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
148
149         /* unmap and free skbs that haven't been transmitted */
150         for (i = 0; i < SONIC_NUM_TDS; i++) {
151                 if(lp->tx_laddr[i]) {
152                         dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
153                         lp->tx_laddr[i] = (dma_addr_t)0;
154                 }
155                 if(lp->tx_skb[i]) {
156                         dev_kfree_skb(lp->tx_skb[i]);
157                         lp->tx_skb[i] = NULL;
158                 }
159         }
160
161         /* unmap and free the receive buffers */
162         for (i = 0; i < SONIC_NUM_RRS; i++) {
163                 if(lp->rx_laddr[i]) {
164                         dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
165                         lp->rx_laddr[i] = (dma_addr_t)0;
166                 }
167                 if(lp->rx_skb[i]) {
168                         dev_kfree_skb(lp->rx_skb[i]);
169                         lp->rx_skb[i] = NULL;
170                 }
171         }
172
173         free_irq(dev->irq, dev);        /* release the IRQ */
174
175         return 0;
176 }
177
178 static void sonic_tx_timeout(struct net_device *dev)
179 {
180         struct sonic_local *lp = netdev_priv(dev);
181         int i;
182         /* Stop the interrupts for this */
183         SONIC_WRITE(SONIC_IMR, 0);
184         /* We could resend the original skbs. Easier to re-initialise. */
185         for (i = 0; i < SONIC_NUM_TDS; i++) {
186                 if(lp->tx_laddr[i]) {
187                         dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
188                         lp->tx_laddr[i] = (dma_addr_t)0;
189                 }
190                 if(lp->tx_skb[i]) {
191                         dev_kfree_skb(lp->tx_skb[i]);
192                         lp->tx_skb[i] = NULL;
193                 }
194         }
195         /* Try to restart the adaptor. */
196         sonic_init(dev);
197         lp->stats.tx_errors++;
198         dev->trans_start = jiffies;
199         netif_wake_queue(dev);
200 }
201
202 /*
203  * transmit packet
204  *
205  * Appends new TD during transmission thus avoiding any TX interrupts
206  * until we run out of TDs.
207  * This routine interacts closely with the ISR in that it may,
208  *   set tx_skb[i]
209  *   reset the status flags of the new TD
210  *   set and reset EOL flags
211  *   stop the tx queue
212  * The ISR interacts with this routine in various ways. It may,
213  *   reset tx_skb[i]
214  *   test the EOL and status flags of the TDs
215  *   wake the tx queue
216  * Concurrently with all of this, the SONIC is potentially writing to
217  * the status flags of the TDs.
218  * Until some mutual exclusion is added, this code will not work with SMP. However,
219  * MIPS Jazz machines and m68k Macs were all uni-processor machines.
220  */
221
222 static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
223 {
224         struct sonic_local *lp = netdev_priv(dev);
225         dma_addr_t laddr;
226         int length;
227         int entry = lp->next_tx;
228
229         if (sonic_debug > 2)
230                 printk("sonic_send_packet: skb=%p, dev=%p\n", skb, dev);
231
232         length = skb->len;
233         if (length < ETH_ZLEN) {
234                 if (skb_padto(skb, ETH_ZLEN))
235                         return 0;
236                 length = ETH_ZLEN;
237         }
238
239         /*
240          * Map the packet data into the logical DMA address space
241          */
242
243         laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE);
244         if (!laddr) {
245                 printk(KERN_ERR "%s: failed to map tx DMA buffer.\n", dev->name);
246                 dev_kfree_skb(skb);
247                 return 1;
248         }
249    
250         sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0);       /* clear status */
251         sonic_tda_put(dev, entry, SONIC_TD_FRAG_COUNT, 1);   /* single fragment */
252         sonic_tda_put(dev, entry, SONIC_TD_PKTSIZE, length); /* length of packet */
253         sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_L, laddr & 0xffff);
254         sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_H, laddr >> 16);
255         sonic_tda_put(dev, entry, SONIC_TD_FRAG_SIZE, length);
256         sonic_tda_put(dev, entry, SONIC_TD_LINK,
257                 sonic_tda_get(dev, entry, SONIC_TD_LINK) | SONIC_EOL);
258
259         /*
260          * Must set tx_skb[entry] only after clearing status, and
261          * before clearing EOL and before stopping queue
262          */
263         wmb();
264         lp->tx_len[entry] = length;
265         lp->tx_laddr[entry] = laddr;
266         lp->tx_skb[entry] = skb;
267
268         wmb();
269         sonic_tda_put(dev, lp->eol_tx, SONIC_TD_LINK,
270                                   sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK) & ~SONIC_EOL);
271         lp->eol_tx = entry;
272
273         lp->next_tx = (entry + 1) & SONIC_TDS_MASK;
274         if (lp->tx_skb[lp->next_tx] != NULL) {
275                 /* The ring is full, the ISR has yet to process the next TD. */
276                 if (sonic_debug > 3)
277                         printk("%s: stopping queue\n", dev->name);
278                 netif_stop_queue(dev);
279                 /* after this packet, wait for ISR to free up some TDAs */
280         } else netif_start_queue(dev);
281
282         if (sonic_debug > 2)
283                 printk("sonic_send_packet: issuing Tx command\n");
284
285         SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);
286
287         dev->trans_start = jiffies;
288
289         return 0;
290 }
291
292 /*
293  * The typical workload of the driver:
294  * Handle the network interface interrupts.
295  */
296 static irqreturn_t sonic_interrupt(int irq, void *dev_id, struct pt_regs *regs)
297 {
298         struct net_device *dev = (struct net_device *) dev_id;
299         struct sonic_local *lp = netdev_priv(dev);
300         int status;
301
302         if (dev == NULL) {
303                 printk(KERN_ERR "sonic_interrupt: irq %d for unknown device.\n", irq);
304                 return IRQ_NONE;
305         }
306
307         if (!(status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT))
308                 return IRQ_NONE;
309
310         do {
311                 if (status & SONIC_INT_PKTRX) {
312                         if (sonic_debug > 2)
313                                 printk("%s: packet rx\n", dev->name);
314                         sonic_rx(dev);  /* got packet(s) */
315                         SONIC_WRITE(SONIC_ISR, SONIC_INT_PKTRX); /* clear the interrupt */
316                 }
317
318                 if (status & SONIC_INT_TXDN) {
319                         int entry = lp->cur_tx;
320                         int td_status;
321                         int freed_some = 0;
322
323                         /* At this point, cur_tx is the index of a TD that is one of:
324                          *   unallocated/freed                          (status set   & tx_skb[entry] clear)
325                          *   allocated and sent                         (status set   & tx_skb[entry] set  )
326                          *   allocated and not yet sent                 (status clear & tx_skb[entry] set  )
327                          *   still being allocated by sonic_send_packet (status clear & tx_skb[entry] clear)
328                          */
329
330                         if (sonic_debug > 2)
331                                 printk("%s: tx done\n", dev->name);
332
333                         while (lp->tx_skb[entry] != NULL) {
334                                 if ((td_status = sonic_tda_get(dev, entry, SONIC_TD_STATUS)) == 0)
335                                         break;
336
337                                 if (td_status & 0x0001) {
338                                         lp->stats.tx_packets++;
339                                         lp->stats.tx_bytes += sonic_tda_get(dev, entry, SONIC_TD_PKTSIZE);
340                                 } else {
341                                         lp->stats.tx_errors++;
342                                         if (td_status & 0x0642)
343                                                 lp->stats.tx_aborted_errors++;
344                                         if (td_status & 0x0180)
345                                                 lp->stats.tx_carrier_errors++;
346                                         if (td_status & 0x0020)
347                                                 lp->stats.tx_window_errors++;
348                                         if (td_status & 0x0004)
349                                                 lp->stats.tx_fifo_errors++;
350                                 }
351
352                                 /* We must free the original skb */
353                                 dev_kfree_skb_irq(lp->tx_skb[entry]);
354                                 lp->tx_skb[entry] = NULL;
355                                 /* and unmap DMA buffer */
356                                 dma_unmap_single(lp->device, lp->tx_laddr[entry], lp->tx_len[entry], DMA_TO_DEVICE);
357                                 lp->tx_laddr[entry] = (dma_addr_t)0;
358                                 freed_some = 1;
359
360                                 if (sonic_tda_get(dev, entry, SONIC_TD_LINK) & SONIC_EOL) {
361                                         entry = (entry + 1) & SONIC_TDS_MASK;
362                                         break;
363                                 }
364                                 entry = (entry + 1) & SONIC_TDS_MASK;
365                         }
366
367                         if (freed_some || lp->tx_skb[entry] == NULL)
368                                 netif_wake_queue(dev);  /* The ring is no longer full */
369                         lp->cur_tx = entry;
370                         SONIC_WRITE(SONIC_ISR, SONIC_INT_TXDN); /* clear the interrupt */
371                 }
372
373                 /*
374                  * check error conditions
375                  */
376                 if (status & SONIC_INT_RFO) {
377                         if (sonic_debug > 1)
378                                 printk("%s: rx fifo overrun\n", dev->name);
379                         lp->stats.rx_fifo_errors++;
380                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RFO); /* clear the interrupt */
381                 }
382                 if (status & SONIC_INT_RDE) {
383                         if (sonic_debug > 1)
384                                 printk("%s: rx descriptors exhausted\n", dev->name);
385                         lp->stats.rx_dropped++;
386                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RDE); /* clear the interrupt */
387                 }
388                 if (status & SONIC_INT_RBAE) {
389                         if (sonic_debug > 1)
390                                 printk("%s: rx buffer area exceeded\n", dev->name);
391                         lp->stats.rx_dropped++;
392                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RBAE); /* clear the interrupt */
393                 }
394
395                 /* counter overruns; all counters are 16bit wide */
396                 if (status & SONIC_INT_FAE) {
397                         lp->stats.rx_frame_errors += 65536;
398                         SONIC_WRITE(SONIC_ISR, SONIC_INT_FAE); /* clear the interrupt */
399                 }
400                 if (status & SONIC_INT_CRC) {
401                         lp->stats.rx_crc_errors += 65536;
402                         SONIC_WRITE(SONIC_ISR, SONIC_INT_CRC); /* clear the interrupt */
403                 }
404                 if (status & SONIC_INT_MP) {
405                         lp->stats.rx_missed_errors += 65536;
406                         SONIC_WRITE(SONIC_ISR, SONIC_INT_MP); /* clear the interrupt */
407                 }
408
409                 /* transmit error */
410                 if (status & SONIC_INT_TXER) {
411                         if ((SONIC_READ(SONIC_TCR) & SONIC_TCR_FU) && (sonic_debug > 2))
412                                 printk(KERN_ERR "%s: tx fifo underrun\n", dev->name);
413                         SONIC_WRITE(SONIC_ISR, SONIC_INT_TXER); /* clear the interrupt */
414                 }
415
416                 /* bus retry */
417                 if (status & SONIC_INT_BR) {
418                         printk(KERN_ERR "%s: Bus retry occurred! Device interrupt disabled.\n",
419                                 dev->name);
420                         /* ... to help debug DMA problems causing endless interrupts. */
421                         /* Bounce the eth interface to turn on the interrupt again. */
422                         SONIC_WRITE(SONIC_IMR, 0);
423                         SONIC_WRITE(SONIC_ISR, SONIC_INT_BR); /* clear the interrupt */
424                 }
425
426                 /* load CAM done */
427                 if (status & SONIC_INT_LCD)
428                         SONIC_WRITE(SONIC_ISR, SONIC_INT_LCD); /* clear the interrupt */
429         } while((status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT));
430         return IRQ_HANDLED;
431 }
432
433 /*
434  * We have a good packet(s), pass it/them up the network stack.
435  */
436 static void sonic_rx(struct net_device *dev)
437 {
438         struct sonic_local *lp = netdev_priv(dev);
439         int status;
440         int entry = lp->cur_rx;
441
442         while (sonic_rda_get(dev, entry, SONIC_RD_IN_USE) == 0) {
443                 struct sk_buff *used_skb;
444                 struct sk_buff *new_skb;
445                 dma_addr_t new_laddr;
446                 u16 bufadr_l;
447                 u16 bufadr_h;
448                 int pkt_len;
449
450                 status = sonic_rda_get(dev, entry, SONIC_RD_STATUS);
451                 if (status & SONIC_RCR_PRX) {
452                         /* Malloc up new buffer. */
453                         new_skb = dev_alloc_skb(SONIC_RBSIZE + 2);
454                         if (new_skb == NULL) {
455                                 printk(KERN_ERR "%s: Memory squeeze, dropping packet.\n", dev->name);
456                                 lp->stats.rx_dropped++;
457                                 break;
458                         }
459                         new_skb->dev = dev;
460                         /* provide 16 byte IP header alignment unless DMA requires otherwise */
461                         if(SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
462                                 skb_reserve(new_skb, 2); 
463
464                         new_laddr = dma_map_single(lp->device, skb_put(new_skb, SONIC_RBSIZE),
465                                                SONIC_RBSIZE, DMA_FROM_DEVICE);
466                         if (!new_laddr) {
467                                 dev_kfree_skb(new_skb);
468                                 printk(KERN_ERR "%s: Failed to map rx buffer, dropping packet.\n", dev->name);
469                                 lp->stats.rx_dropped++;
470                                 break;
471                         }
472
473                         /* now we have a new skb to replace it, pass the used one up the stack */
474                         dma_unmap_single(lp->device, lp->rx_laddr[entry], SONIC_RBSIZE, DMA_FROM_DEVICE);
475                         used_skb = lp->rx_skb[entry];
476                         pkt_len = sonic_rda_get(dev, entry, SONIC_RD_PKTLEN);
477                         skb_trim(used_skb, pkt_len);
478                         used_skb->protocol = eth_type_trans(used_skb, dev);
479                         netif_rx(used_skb);
480                         dev->last_rx = jiffies;
481                         lp->stats.rx_packets++;
482                         lp->stats.rx_bytes += pkt_len;
483
484                         /* and insert the new skb */
485                         lp->rx_laddr[entry] = new_laddr;
486                         lp->rx_skb[entry] = new_skb;
487
488                         bufadr_l = (unsigned long)new_laddr & 0xffff;
489                         bufadr_h = (unsigned long)new_laddr >> 16;
490                         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_L, bufadr_l);
491                         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_H, bufadr_h);
492                 } else {
493                         /* This should only happen, if we enable accepting broken packets. */
494                         lp->stats.rx_errors++;
495                         if (status & SONIC_RCR_FAER)
496                                 lp->stats.rx_frame_errors++;
497                         if (status & SONIC_RCR_CRCR)
498                                 lp->stats.rx_crc_errors++;
499                 }
500                 if (status & SONIC_RCR_LPKT) {
501                         /*
502                          * this was the last packet out of the current receive buffer
503                          * give the buffer back to the SONIC
504                          */
505                         lp->cur_rwp += SIZEOF_SONIC_RR * SONIC_BUS_SCALE(lp->dma_bitmode);
506                         if (lp->cur_rwp >= lp->rra_end) lp->cur_rwp = lp->rra_laddr & 0xffff;
507                         SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
508                         if (SONIC_READ(SONIC_ISR) & SONIC_INT_RBE) {
509                                 if (sonic_debug > 2)
510                                         printk("%s: rx buffer exhausted\n", dev->name);
511                                 SONIC_WRITE(SONIC_ISR, SONIC_INT_RBE); /* clear the flag */
512                         }
513                 } else
514                         printk(KERN_ERR "%s: rx desc without RCR_LPKT. Shouldn't happen !?\n",
515                              dev->name);
516                 /*
517                  * give back the descriptor
518                  */
519                 sonic_rda_put(dev, entry, SONIC_RD_LINK,
520                         sonic_rda_get(dev, entry, SONIC_RD_LINK) | SONIC_EOL);
521                 sonic_rda_put(dev, entry, SONIC_RD_IN_USE, 1);
522                 sonic_rda_put(dev, lp->eol_rx, SONIC_RD_LINK,
523                         sonic_rda_get(dev, lp->eol_rx, SONIC_RD_LINK) & ~SONIC_EOL);
524                 lp->eol_rx = entry;
525                 lp->cur_rx = entry = (entry + 1) & SONIC_RDS_MASK;
526         }
527         /*
528          * If any worth-while packets have been received, netif_rx()
529          * has done a mark_bh(NET_BH) for us and will work on them
530          * when we get to the bottom-half routine.
531          */
532 }
533
534
535 /*
536  * Get the current statistics.
537  * This may be called with the device open or closed.
538  */
539 static struct net_device_stats *sonic_get_stats(struct net_device *dev)
540 {
541         struct sonic_local *lp = netdev_priv(dev);
542
543         /* read the tally counter from the SONIC and reset them */
544         lp->stats.rx_crc_errors += SONIC_READ(SONIC_CRCT);
545         SONIC_WRITE(SONIC_CRCT, 0xffff);
546         lp->stats.rx_frame_errors += SONIC_READ(SONIC_FAET);
547         SONIC_WRITE(SONIC_FAET, 0xffff);
548         lp->stats.rx_missed_errors += SONIC_READ(SONIC_MPT);
549         SONIC_WRITE(SONIC_MPT, 0xffff);
550
551         return &lp->stats;
552 }
553
554
555 /*
556  * Set or clear the multicast filter for this adaptor.
557  */
558 static void sonic_multicast_list(struct net_device *dev)
559 {
560         struct sonic_local *lp = netdev_priv(dev);
561         unsigned int rcr;
562         struct dev_mc_list *dmi = dev->mc_list;
563         unsigned char *addr;
564         int i;
565
566         rcr = SONIC_READ(SONIC_RCR) & ~(SONIC_RCR_PRO | SONIC_RCR_AMC);
567         rcr |= SONIC_RCR_BRD;   /* accept broadcast packets */
568
569         if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
570                 rcr |= SONIC_RCR_PRO;
571         } else {
572                 if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 15)) {
573                         rcr |= SONIC_RCR_AMC;
574                 } else {
575                         if (sonic_debug > 2)
576                                 printk("sonic_multicast_list: mc_count %d\n", dev->mc_count);
577                         sonic_set_cam_enable(dev, 1);  /* always enable our own address */
578                         for (i = 1; i <= dev->mc_count; i++) {
579                                 addr = dmi->dmi_addr;
580                                 dmi = dmi->next;
581                                 sonic_cda_put(dev, i, SONIC_CD_CAP0, addr[1] << 8 | addr[0]);
582                                 sonic_cda_put(dev, i, SONIC_CD_CAP1, addr[3] << 8 | addr[2]);
583                                 sonic_cda_put(dev, i, SONIC_CD_CAP2, addr[5] << 8 | addr[4]);
584                                 sonic_set_cam_enable(dev, sonic_get_cam_enable(dev) | (1 << i));
585                         }
586                         SONIC_WRITE(SONIC_CDC, 16);
587                         /* issue Load CAM command */
588                         SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
589                         SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
590                 }
591         }
592
593         if (sonic_debug > 2)
594                 printk("sonic_multicast_list: setting RCR=%x\n", rcr);
595
596         SONIC_WRITE(SONIC_RCR, rcr);
597 }
598
599
600 /*
601  * Initialize the SONIC ethernet controller.
602  */
603 static int sonic_init(struct net_device *dev)
604 {
605         unsigned int cmd;
606         struct sonic_local *lp = netdev_priv(dev);
607         int i;
608
609         /*
610          * put the Sonic into software-reset mode and
611          * disable all interrupts
612          */
613         SONIC_WRITE(SONIC_IMR, 0);
614         SONIC_WRITE(SONIC_ISR, 0x7fff);
615         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
616
617         /*
618          * clear software reset flag, disable receiver, clear and
619          * enable interrupts, then completely initialize the SONIC
620          */
621         SONIC_WRITE(SONIC_CMD, 0);
622         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS);
623
624         /*
625          * initialize the receive resource area
626          */
627         if (sonic_debug > 2)
628                 printk("sonic_init: initialize receive resource area\n");
629
630         for (i = 0; i < SONIC_NUM_RRS; i++) {
631                 u16 bufadr_l = (unsigned long)lp->rx_laddr[i] & 0xffff;
632                 u16 bufadr_h = (unsigned long)lp->rx_laddr[i] >> 16;
633                 sonic_rra_put(dev, i, SONIC_RR_BUFADR_L, bufadr_l);
634                 sonic_rra_put(dev, i, SONIC_RR_BUFADR_H, bufadr_h);
635                 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_L, SONIC_RBSIZE >> 1);
636                 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_H, 0);
637         }
638
639         /* initialize all RRA registers */
640         lp->rra_end = (lp->rra_laddr + SONIC_NUM_RRS * SIZEOF_SONIC_RR *
641                                         SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
642         lp->cur_rwp = (lp->rra_laddr + (SONIC_NUM_RRS - 1) * SIZEOF_SONIC_RR *
643                                         SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
644   
645         SONIC_WRITE(SONIC_RSA, lp->rra_laddr & 0xffff);
646         SONIC_WRITE(SONIC_REA, lp->rra_end);
647         SONIC_WRITE(SONIC_RRP, lp->rra_laddr & 0xffff);
648         SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
649         SONIC_WRITE(SONIC_URRA, lp->rra_laddr >> 16);
650         SONIC_WRITE(SONIC_EOBC, (SONIC_RBSIZE >> 1) - (lp->dma_bitmode ? 2 : 1));
651
652         /* load the resource pointers */
653         if (sonic_debug > 3)
654                 printk("sonic_init: issuing RRRA command\n");
655   
656         SONIC_WRITE(SONIC_CMD, SONIC_CR_RRRA);
657         i = 0;
658         while (i++ < 100) {
659                 if (SONIC_READ(SONIC_CMD) & SONIC_CR_RRRA)
660                         break;
661         }
662
663         if (sonic_debug > 2)
664                 printk("sonic_init: status=%x i=%d\n", SONIC_READ(SONIC_CMD), i);
665     
666         /*
667          * Initialize the receive descriptors so that they
668          * become a circular linked list, ie. let the last
669          * descriptor point to the first again.
670          */
671         if (sonic_debug > 2)
672                 printk("sonic_init: initialize receive descriptors\n");      
673         for (i=0; i<SONIC_NUM_RDS; i++) {
674                 sonic_rda_put(dev, i, SONIC_RD_STATUS, 0);
675                 sonic_rda_put(dev, i, SONIC_RD_PKTLEN, 0);
676                 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_L, 0);
677                 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_H, 0);
678                 sonic_rda_put(dev, i, SONIC_RD_SEQNO, 0);
679                 sonic_rda_put(dev, i, SONIC_RD_IN_USE, 1);
680                 sonic_rda_put(dev, i, SONIC_RD_LINK,
681                         lp->rda_laddr +
682                         ((i+1) * SIZEOF_SONIC_RD * SONIC_BUS_SCALE(lp->dma_bitmode)));
683         }
684         /* fix last descriptor */
685         sonic_rda_put(dev, SONIC_NUM_RDS - 1, SONIC_RD_LINK,
686                 (lp->rda_laddr & 0xffff) | SONIC_EOL);
687         lp->eol_rx = SONIC_NUM_RDS - 1;
688         lp->cur_rx = 0;
689         SONIC_WRITE(SONIC_URDA, lp->rda_laddr >> 16);
690         SONIC_WRITE(SONIC_CRDA, lp->rda_laddr & 0xffff);
691
692         /* 
693          * initialize transmit descriptors
694          */
695         if (sonic_debug > 2)
696                 printk("sonic_init: initialize transmit descriptors\n");
697         for (i = 0; i < SONIC_NUM_TDS; i++) {
698                 sonic_tda_put(dev, i, SONIC_TD_STATUS, 0);
699                 sonic_tda_put(dev, i, SONIC_TD_CONFIG, 0);
700                 sonic_tda_put(dev, i, SONIC_TD_PKTSIZE, 0);
701                 sonic_tda_put(dev, i, SONIC_TD_FRAG_COUNT, 0);
702                 sonic_tda_put(dev, i, SONIC_TD_LINK,
703                         (lp->tda_laddr & 0xffff) +
704                         (i + 1) * SIZEOF_SONIC_TD * SONIC_BUS_SCALE(lp->dma_bitmode));
705                 lp->tx_skb[i] = NULL;
706         }
707         /* fix last descriptor */
708         sonic_tda_put(dev, SONIC_NUM_TDS - 1, SONIC_TD_LINK,
709                 (lp->tda_laddr & 0xffff));
710
711         SONIC_WRITE(SONIC_UTDA, lp->tda_laddr >> 16);
712         SONIC_WRITE(SONIC_CTDA, lp->tda_laddr & 0xffff);
713         lp->cur_tx = lp->next_tx = 0;
714         lp->eol_tx = SONIC_NUM_TDS - 1;
715     
716         /*
717          * put our own address to CAM desc[0]
718          */
719         sonic_cda_put(dev, 0, SONIC_CD_CAP0, dev->dev_addr[1] << 8 | dev->dev_addr[0]);
720         sonic_cda_put(dev, 0, SONIC_CD_CAP1, dev->dev_addr[3] << 8 | dev->dev_addr[2]);
721         sonic_cda_put(dev, 0, SONIC_CD_CAP2, dev->dev_addr[5] << 8 | dev->dev_addr[4]);
722         sonic_set_cam_enable(dev, 1);
723
724         for (i = 0; i < 16; i++)
725                 sonic_cda_put(dev, i, SONIC_CD_ENTRY_POINTER, i);
726
727         /*
728          * initialize CAM registers
729          */
730         SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
731         SONIC_WRITE(SONIC_CDC, 16);
732
733         /*
734          * load the CAM
735          */
736         SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
737
738         i = 0;
739         while (i++ < 100) {
740                 if (SONIC_READ(SONIC_ISR) & SONIC_INT_LCD)
741                         break;
742         }
743         if (sonic_debug > 2) {
744                 printk("sonic_init: CMD=%x, ISR=%x\n, i=%d",
745                        SONIC_READ(SONIC_CMD), SONIC_READ(SONIC_ISR), i);
746         }
747
748         /*
749          * enable receiver, disable loopback
750          * and enable all interrupts
751          */
752         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXEN | SONIC_CR_STP);
753         SONIC_WRITE(SONIC_RCR, SONIC_RCR_DEFAULT);
754         SONIC_WRITE(SONIC_TCR, SONIC_TCR_DEFAULT);
755         SONIC_WRITE(SONIC_ISR, 0x7fff);
756         SONIC_WRITE(SONIC_IMR, SONIC_IMR_DEFAULT);
757
758         cmd = SONIC_READ(SONIC_CMD);
759         if ((cmd & SONIC_CR_RXEN) == 0 || (cmd & SONIC_CR_STP) == 0)
760                 printk(KERN_ERR "sonic_init: failed, status=%x\n", cmd);
761
762         if (sonic_debug > 2)
763                 printk("sonic_init: new status=%x\n",
764                        SONIC_READ(SONIC_CMD));
765
766         return 0;
767 }
768
769 MODULE_LICENSE("GPL");