Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-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                 skb = skb_padto(skb, ETH_ZLEN);
235                 if (skb == NULL)
236                         return 0;
237                 length = ETH_ZLEN;
238         }
239
240         /*
241          * Map the packet data into the logical DMA address space
242          */
243
244         laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE);
245         if (!laddr) {
246                 printk(KERN_ERR "%s: failed to map tx DMA buffer.\n", dev->name);
247                 dev_kfree_skb(skb);
248                 return 1;
249         }
250    
251         sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0);       /* clear status */
252         sonic_tda_put(dev, entry, SONIC_TD_FRAG_COUNT, 1);   /* single fragment */
253         sonic_tda_put(dev, entry, SONIC_TD_PKTSIZE, length); /* length of packet */
254         sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_L, laddr & 0xffff);
255         sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_H, laddr >> 16);
256         sonic_tda_put(dev, entry, SONIC_TD_FRAG_SIZE, length);
257         sonic_tda_put(dev, entry, SONIC_TD_LINK,
258                 sonic_tda_get(dev, entry, SONIC_TD_LINK) | SONIC_EOL);
259
260         /*
261          * Must set tx_skb[entry] only after clearing status, and
262          * before clearing EOL and before stopping queue
263          */
264         wmb();
265         lp->tx_len[entry] = length;
266         lp->tx_laddr[entry] = laddr;
267         lp->tx_skb[entry] = skb;
268
269         wmb();
270         sonic_tda_put(dev, lp->eol_tx, SONIC_TD_LINK,
271                                   sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK) & ~SONIC_EOL);
272         lp->eol_tx = entry;
273
274         lp->next_tx = (entry + 1) & SONIC_TDS_MASK;
275         if (lp->tx_skb[lp->next_tx] != NULL) {
276                 /* The ring is full, the ISR has yet to process the next TD. */
277                 if (sonic_debug > 3)
278                         printk("%s: stopping queue\n", dev->name);
279                 netif_stop_queue(dev);
280                 /* after this packet, wait for ISR to free up some TDAs */
281         } else netif_start_queue(dev);
282
283         if (sonic_debug > 2)
284                 printk("sonic_send_packet: issuing Tx command\n");
285
286         SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);
287
288         dev->trans_start = jiffies;
289
290         return 0;
291 }
292
293 /*
294  * The typical workload of the driver:
295  * Handle the network interface interrupts.
296  */
297 static irqreturn_t sonic_interrupt(int irq, void *dev_id, struct pt_regs *regs)
298 {
299         struct net_device *dev = (struct net_device *) dev_id;
300         struct sonic_local *lp = netdev_priv(dev);
301         int status;
302
303         if (dev == NULL) {
304                 printk(KERN_ERR "sonic_interrupt: irq %d for unknown device.\n", irq);
305                 return IRQ_NONE;
306         }
307
308         if (!(status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT))
309                 return IRQ_NONE;
310
311         do {
312                 if (status & SONIC_INT_PKTRX) {
313                         if (sonic_debug > 2)
314                                 printk("%s: packet rx\n", dev->name);
315                         sonic_rx(dev);  /* got packet(s) */
316                         SONIC_WRITE(SONIC_ISR, SONIC_INT_PKTRX); /* clear the interrupt */
317                 }
318
319                 if (status & SONIC_INT_TXDN) {
320                         int entry = lp->cur_tx;
321                         int td_status;
322                         int freed_some = 0;
323
324                         /* At this point, cur_tx is the index of a TD that is one of:
325                          *   unallocated/freed                          (status set   & tx_skb[entry] clear)
326                          *   allocated and sent                         (status set   & tx_skb[entry] set  )
327                          *   allocated and not yet sent                 (status clear & tx_skb[entry] set  )
328                          *   still being allocated by sonic_send_packet (status clear & tx_skb[entry] clear)
329                          */
330
331                         if (sonic_debug > 2)
332                                 printk("%s: tx done\n", dev->name);
333
334                         while (lp->tx_skb[entry] != NULL) {
335                                 if ((td_status = sonic_tda_get(dev, entry, SONIC_TD_STATUS)) == 0)
336                                         break;
337
338                                 if (td_status & 0x0001) {
339                                         lp->stats.tx_packets++;
340                                         lp->stats.tx_bytes += sonic_tda_get(dev, entry, SONIC_TD_PKTSIZE);
341                                 } else {
342                                         lp->stats.tx_errors++;
343                                         if (td_status & 0x0642)
344                                                 lp->stats.tx_aborted_errors++;
345                                         if (td_status & 0x0180)
346                                                 lp->stats.tx_carrier_errors++;
347                                         if (td_status & 0x0020)
348                                                 lp->stats.tx_window_errors++;
349                                         if (td_status & 0x0004)
350                                                 lp->stats.tx_fifo_errors++;
351                                 }
352
353                                 /* We must free the original skb */
354                                 dev_kfree_skb_irq(lp->tx_skb[entry]);
355                                 lp->tx_skb[entry] = NULL;
356                                 /* and unmap DMA buffer */
357                                 dma_unmap_single(lp->device, lp->tx_laddr[entry], lp->tx_len[entry], DMA_TO_DEVICE);
358                                 lp->tx_laddr[entry] = (dma_addr_t)0;
359                                 freed_some = 1;
360
361                                 if (sonic_tda_get(dev, entry, SONIC_TD_LINK) & SONIC_EOL) {
362                                         entry = (entry + 1) & SONIC_TDS_MASK;
363                                         break;
364                                 }
365                                 entry = (entry + 1) & SONIC_TDS_MASK;
366                         }
367
368                         if (freed_some || lp->tx_skb[entry] == NULL)
369                                 netif_wake_queue(dev);  /* The ring is no longer full */
370                         lp->cur_tx = entry;
371                         SONIC_WRITE(SONIC_ISR, SONIC_INT_TXDN); /* clear the interrupt */
372                 }
373
374                 /*
375                  * check error conditions
376                  */
377                 if (status & SONIC_INT_RFO) {
378                         if (sonic_debug > 1)
379                                 printk("%s: rx fifo overrun\n", dev->name);
380                         lp->stats.rx_fifo_errors++;
381                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RFO); /* clear the interrupt */
382                 }
383                 if (status & SONIC_INT_RDE) {
384                         if (sonic_debug > 1)
385                                 printk("%s: rx descriptors exhausted\n", dev->name);
386                         lp->stats.rx_dropped++;
387                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RDE); /* clear the interrupt */
388                 }
389                 if (status & SONIC_INT_RBAE) {
390                         if (sonic_debug > 1)
391                                 printk("%s: rx buffer area exceeded\n", dev->name);
392                         lp->stats.rx_dropped++;
393                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RBAE); /* clear the interrupt */
394                 }
395
396                 /* counter overruns; all counters are 16bit wide */
397                 if (status & SONIC_INT_FAE) {
398                         lp->stats.rx_frame_errors += 65536;
399                         SONIC_WRITE(SONIC_ISR, SONIC_INT_FAE); /* clear the interrupt */
400                 }
401                 if (status & SONIC_INT_CRC) {
402                         lp->stats.rx_crc_errors += 65536;
403                         SONIC_WRITE(SONIC_ISR, SONIC_INT_CRC); /* clear the interrupt */
404                 }
405                 if (status & SONIC_INT_MP) {
406                         lp->stats.rx_missed_errors += 65536;
407                         SONIC_WRITE(SONIC_ISR, SONIC_INT_MP); /* clear the interrupt */
408                 }
409
410                 /* transmit error */
411                 if (status & SONIC_INT_TXER) {
412                         if ((SONIC_READ(SONIC_TCR) & SONIC_TCR_FU) && (sonic_debug > 2))
413                                 printk(KERN_ERR "%s: tx fifo underrun\n", dev->name);
414                         SONIC_WRITE(SONIC_ISR, SONIC_INT_TXER); /* clear the interrupt */
415                 }
416
417                 /* bus retry */
418                 if (status & SONIC_INT_BR) {
419                         printk(KERN_ERR "%s: Bus retry occurred! Device interrupt disabled.\n",
420                                 dev->name);
421                         /* ... to help debug DMA problems causing endless interrupts. */
422                         /* Bounce the eth interface to turn on the interrupt again. */
423                         SONIC_WRITE(SONIC_IMR, 0);
424                         SONIC_WRITE(SONIC_ISR, SONIC_INT_BR); /* clear the interrupt */
425                 }
426
427                 /* load CAM done */
428                 if (status & SONIC_INT_LCD)
429                         SONIC_WRITE(SONIC_ISR, SONIC_INT_LCD); /* clear the interrupt */
430         } while((status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT));
431         return IRQ_HANDLED;
432 }
433
434 /*
435  * We have a good packet(s), pass it/them up the network stack.
436  */
437 static void sonic_rx(struct net_device *dev)
438 {
439         struct sonic_local *lp = netdev_priv(dev);
440         int status;
441         int entry = lp->cur_rx;
442
443         while (sonic_rda_get(dev, entry, SONIC_RD_IN_USE) == 0) {
444                 struct sk_buff *used_skb;
445                 struct sk_buff *new_skb;
446                 dma_addr_t new_laddr;
447                 u16 bufadr_l;
448                 u16 bufadr_h;
449                 int pkt_len;
450
451                 status = sonic_rda_get(dev, entry, SONIC_RD_STATUS);
452                 if (status & SONIC_RCR_PRX) {
453                         /* Malloc up new buffer. */
454                         new_skb = dev_alloc_skb(SONIC_RBSIZE + 2);
455                         if (new_skb == NULL) {
456                                 printk(KERN_ERR "%s: Memory squeeze, dropping packet.\n", dev->name);
457                                 lp->stats.rx_dropped++;
458                                 break;
459                         }
460                         new_skb->dev = dev;
461                         /* provide 16 byte IP header alignment unless DMA requires otherwise */
462                         if(SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
463                                 skb_reserve(new_skb, 2); 
464
465                         new_laddr = dma_map_single(lp->device, skb_put(new_skb, SONIC_RBSIZE),
466                                                SONIC_RBSIZE, DMA_FROM_DEVICE);
467                         if (!new_laddr) {
468                                 dev_kfree_skb(new_skb);
469                                 printk(KERN_ERR "%s: Failed to map rx buffer, dropping packet.\n", dev->name);
470                                 lp->stats.rx_dropped++;
471                                 break;
472                         }
473
474                         /* now we have a new skb to replace it, pass the used one up the stack */
475                         dma_unmap_single(lp->device, lp->rx_laddr[entry], SONIC_RBSIZE, DMA_FROM_DEVICE);
476                         used_skb = lp->rx_skb[entry];
477                         pkt_len = sonic_rda_get(dev, entry, SONIC_RD_PKTLEN);
478                         skb_trim(used_skb, pkt_len);
479                         used_skb->protocol = eth_type_trans(used_skb, dev);
480                         netif_rx(used_skb);
481                         dev->last_rx = jiffies;
482                         lp->stats.rx_packets++;
483                         lp->stats.rx_bytes += pkt_len;
484
485                         /* and insert the new skb */
486                         lp->rx_laddr[entry] = new_laddr;
487                         lp->rx_skb[entry] = new_skb;
488
489                         bufadr_l = (unsigned long)new_laddr & 0xffff;
490                         bufadr_h = (unsigned long)new_laddr >> 16;
491                         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_L, bufadr_l);
492                         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_H, bufadr_h);
493                 } else {
494                         /* This should only happen, if we enable accepting broken packets. */
495                         lp->stats.rx_errors++;
496                         if (status & SONIC_RCR_FAER)
497                                 lp->stats.rx_frame_errors++;
498                         if (status & SONIC_RCR_CRCR)
499                                 lp->stats.rx_crc_errors++;
500                 }
501                 if (status & SONIC_RCR_LPKT) {
502                         /*
503                          * this was the last packet out of the current receive buffer
504                          * give the buffer back to the SONIC
505                          */
506                         lp->cur_rwp += SIZEOF_SONIC_RR * SONIC_BUS_SCALE(lp->dma_bitmode);
507                         if (lp->cur_rwp >= lp->rra_end) lp->cur_rwp = lp->rra_laddr & 0xffff;
508                         SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
509                         if (SONIC_READ(SONIC_ISR) & SONIC_INT_RBE) {
510                                 if (sonic_debug > 2)
511                                         printk("%s: rx buffer exhausted\n", dev->name);
512                                 SONIC_WRITE(SONIC_ISR, SONIC_INT_RBE); /* clear the flag */
513                         }
514                 } else
515                         printk(KERN_ERR "%s: rx desc without RCR_LPKT. Shouldn't happen !?\n",
516                              dev->name);
517                 /*
518                  * give back the descriptor
519                  */
520                 sonic_rda_put(dev, entry, SONIC_RD_LINK,
521                         sonic_rda_get(dev, entry, SONIC_RD_LINK) | SONIC_EOL);
522                 sonic_rda_put(dev, entry, SONIC_RD_IN_USE, 1);
523                 sonic_rda_put(dev, lp->eol_rx, SONIC_RD_LINK,
524                         sonic_rda_get(dev, lp->eol_rx, SONIC_RD_LINK) & ~SONIC_EOL);
525                 lp->eol_rx = entry;
526                 lp->cur_rx = entry = (entry + 1) & SONIC_RDS_MASK;
527         }
528         /*
529          * If any worth-while packets have been received, netif_rx()
530          * has done a mark_bh(NET_BH) for us and will work on them
531          * when we get to the bottom-half routine.
532          */
533 }
534
535
536 /*
537  * Get the current statistics.
538  * This may be called with the device open or closed.
539  */
540 static struct net_device_stats *sonic_get_stats(struct net_device *dev)
541 {
542         struct sonic_local *lp = netdev_priv(dev);
543
544         /* read the tally counter from the SONIC and reset them */
545         lp->stats.rx_crc_errors += SONIC_READ(SONIC_CRCT);
546         SONIC_WRITE(SONIC_CRCT, 0xffff);
547         lp->stats.rx_frame_errors += SONIC_READ(SONIC_FAET);
548         SONIC_WRITE(SONIC_FAET, 0xffff);
549         lp->stats.rx_missed_errors += SONIC_READ(SONIC_MPT);
550         SONIC_WRITE(SONIC_MPT, 0xffff);
551
552         return &lp->stats;
553 }
554
555
556 /*
557  * Set or clear the multicast filter for this adaptor.
558  */
559 static void sonic_multicast_list(struct net_device *dev)
560 {
561         struct sonic_local *lp = netdev_priv(dev);
562         unsigned int rcr;
563         struct dev_mc_list *dmi = dev->mc_list;
564         unsigned char *addr;
565         int i;
566
567         rcr = SONIC_READ(SONIC_RCR) & ~(SONIC_RCR_PRO | SONIC_RCR_AMC);
568         rcr |= SONIC_RCR_BRD;   /* accept broadcast packets */
569
570         if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
571                 rcr |= SONIC_RCR_PRO;
572         } else {
573                 if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 15)) {
574                         rcr |= SONIC_RCR_AMC;
575                 } else {
576                         if (sonic_debug > 2)
577                                 printk("sonic_multicast_list: mc_count %d\n", dev->mc_count);
578                         sonic_set_cam_enable(dev, 1);  /* always enable our own address */
579                         for (i = 1; i <= dev->mc_count; i++) {
580                                 addr = dmi->dmi_addr;
581                                 dmi = dmi->next;
582                                 sonic_cda_put(dev, i, SONIC_CD_CAP0, addr[1] << 8 | addr[0]);
583                                 sonic_cda_put(dev, i, SONIC_CD_CAP1, addr[3] << 8 | addr[2]);
584                                 sonic_cda_put(dev, i, SONIC_CD_CAP2, addr[5] << 8 | addr[4]);
585                                 sonic_set_cam_enable(dev, sonic_get_cam_enable(dev) | (1 << i));
586                         }
587                         SONIC_WRITE(SONIC_CDC, 16);
588                         /* issue Load CAM command */
589                         SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
590                         SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
591                 }
592         }
593
594         if (sonic_debug > 2)
595                 printk("sonic_multicast_list: setting RCR=%x\n", rcr);
596
597         SONIC_WRITE(SONIC_RCR, rcr);
598 }
599
600
601 /*
602  * Initialize the SONIC ethernet controller.
603  */
604 static int sonic_init(struct net_device *dev)
605 {
606         unsigned int cmd;
607         struct sonic_local *lp = netdev_priv(dev);
608         int i;
609
610         /*
611          * put the Sonic into software-reset mode and
612          * disable all interrupts
613          */
614         SONIC_WRITE(SONIC_IMR, 0);
615         SONIC_WRITE(SONIC_ISR, 0x7fff);
616         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
617
618         /*
619          * clear software reset flag, disable receiver, clear and
620          * enable interrupts, then completely initialize the SONIC
621          */
622         SONIC_WRITE(SONIC_CMD, 0);
623         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS);
624
625         /*
626          * initialize the receive resource area
627          */
628         if (sonic_debug > 2)
629                 printk("sonic_init: initialize receive resource area\n");
630
631         for (i = 0; i < SONIC_NUM_RRS; i++) {
632                 u16 bufadr_l = (unsigned long)lp->rx_laddr[i] & 0xffff;
633                 u16 bufadr_h = (unsigned long)lp->rx_laddr[i] >> 16;
634                 sonic_rra_put(dev, i, SONIC_RR_BUFADR_L, bufadr_l);
635                 sonic_rra_put(dev, i, SONIC_RR_BUFADR_H, bufadr_h);
636                 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_L, SONIC_RBSIZE >> 1);
637                 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_H, 0);
638         }
639
640         /* initialize all RRA registers */
641         lp->rra_end = (lp->rra_laddr + SONIC_NUM_RRS * SIZEOF_SONIC_RR *
642                                         SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
643         lp->cur_rwp = (lp->rra_laddr + (SONIC_NUM_RRS - 1) * SIZEOF_SONIC_RR *
644                                         SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
645   
646         SONIC_WRITE(SONIC_RSA, lp->rra_laddr & 0xffff);
647         SONIC_WRITE(SONIC_REA, lp->rra_end);
648         SONIC_WRITE(SONIC_RRP, lp->rra_laddr & 0xffff);
649         SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
650         SONIC_WRITE(SONIC_URRA, lp->rra_laddr >> 16);
651         SONIC_WRITE(SONIC_EOBC, (SONIC_RBSIZE >> 1) - (lp->dma_bitmode ? 2 : 1));
652
653         /* load the resource pointers */
654         if (sonic_debug > 3)
655                 printk("sonic_init: issuing RRRA command\n");
656   
657         SONIC_WRITE(SONIC_CMD, SONIC_CR_RRRA);
658         i = 0;
659         while (i++ < 100) {
660                 if (SONIC_READ(SONIC_CMD) & SONIC_CR_RRRA)
661                         break;
662         }
663
664         if (sonic_debug > 2)
665                 printk("sonic_init: status=%x i=%d\n", SONIC_READ(SONIC_CMD), i);
666     
667         /*
668          * Initialize the receive descriptors so that they
669          * become a circular linked list, ie. let the last
670          * descriptor point to the first again.
671          */
672         if (sonic_debug > 2)
673                 printk("sonic_init: initialize receive descriptors\n");      
674         for (i=0; i<SONIC_NUM_RDS; i++) {
675                 sonic_rda_put(dev, i, SONIC_RD_STATUS, 0);
676                 sonic_rda_put(dev, i, SONIC_RD_PKTLEN, 0);
677                 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_L, 0);
678                 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_H, 0);
679                 sonic_rda_put(dev, i, SONIC_RD_SEQNO, 0);
680                 sonic_rda_put(dev, i, SONIC_RD_IN_USE, 1);
681                 sonic_rda_put(dev, i, SONIC_RD_LINK,
682                         lp->rda_laddr +
683                         ((i+1) * SIZEOF_SONIC_RD * SONIC_BUS_SCALE(lp->dma_bitmode)));
684         }
685         /* fix last descriptor */
686         sonic_rda_put(dev, SONIC_NUM_RDS - 1, SONIC_RD_LINK,
687                 (lp->rda_laddr & 0xffff) | SONIC_EOL);
688         lp->eol_rx = SONIC_NUM_RDS - 1;
689         lp->cur_rx = 0;
690         SONIC_WRITE(SONIC_URDA, lp->rda_laddr >> 16);
691         SONIC_WRITE(SONIC_CRDA, lp->rda_laddr & 0xffff);
692
693         /* 
694          * initialize transmit descriptors
695          */
696         if (sonic_debug > 2)
697                 printk("sonic_init: initialize transmit descriptors\n");
698         for (i = 0; i < SONIC_NUM_TDS; i++) {
699                 sonic_tda_put(dev, i, SONIC_TD_STATUS, 0);
700                 sonic_tda_put(dev, i, SONIC_TD_CONFIG, 0);
701                 sonic_tda_put(dev, i, SONIC_TD_PKTSIZE, 0);
702                 sonic_tda_put(dev, i, SONIC_TD_FRAG_COUNT, 0);
703                 sonic_tda_put(dev, i, SONIC_TD_LINK,
704                         (lp->tda_laddr & 0xffff) +
705                         (i + 1) * SIZEOF_SONIC_TD * SONIC_BUS_SCALE(lp->dma_bitmode));
706                 lp->tx_skb[i] = NULL;
707         }
708         /* fix last descriptor */
709         sonic_tda_put(dev, SONIC_NUM_TDS - 1, SONIC_TD_LINK,
710                 (lp->tda_laddr & 0xffff));
711
712         SONIC_WRITE(SONIC_UTDA, lp->tda_laddr >> 16);
713         SONIC_WRITE(SONIC_CTDA, lp->tda_laddr & 0xffff);
714         lp->cur_tx = lp->next_tx = 0;
715         lp->eol_tx = SONIC_NUM_TDS - 1;
716     
717         /*
718          * put our own address to CAM desc[0]
719          */
720         sonic_cda_put(dev, 0, SONIC_CD_CAP0, dev->dev_addr[1] << 8 | dev->dev_addr[0]);
721         sonic_cda_put(dev, 0, SONIC_CD_CAP1, dev->dev_addr[3] << 8 | dev->dev_addr[2]);
722         sonic_cda_put(dev, 0, SONIC_CD_CAP2, dev->dev_addr[5] << 8 | dev->dev_addr[4]);
723         sonic_set_cam_enable(dev, 1);
724
725         for (i = 0; i < 16; i++)
726                 sonic_cda_put(dev, i, SONIC_CD_ENTRY_POINTER, i);
727
728         /*
729          * initialize CAM registers
730          */
731         SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
732         SONIC_WRITE(SONIC_CDC, 16);
733
734         /*
735          * load the CAM
736          */
737         SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
738
739         i = 0;
740         while (i++ < 100) {
741                 if (SONIC_READ(SONIC_ISR) & SONIC_INT_LCD)
742                         break;
743         }
744         if (sonic_debug > 2) {
745                 printk("sonic_init: CMD=%x, ISR=%x\n, i=%d",
746                        SONIC_READ(SONIC_CMD), SONIC_READ(SONIC_ISR), i);
747         }
748
749         /*
750          * enable receiver, disable loopback
751          * and enable all interrupts
752          */
753         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXEN | SONIC_CR_STP);
754         SONIC_WRITE(SONIC_RCR, SONIC_RCR_DEFAULT);
755         SONIC_WRITE(SONIC_TCR, SONIC_TCR_DEFAULT);
756         SONIC_WRITE(SONIC_ISR, 0x7fff);
757         SONIC_WRITE(SONIC_IMR, SONIC_IMR_DEFAULT);
758
759         cmd = SONIC_READ(SONIC_CMD);
760         if ((cmd & SONIC_CR_RXEN) == 0 || (cmd & SONIC_CR_STP) == 0)
761                 printk(KERN_ERR "sonic_init: failed, status=%x\n", cmd);
762
763         if (sonic_debug > 2)
764                 printk("sonic_init: new status=%x\n",
765                        SONIC_READ(SONIC_CMD));
766
767         return 0;
768 }
769
770 MODULE_LICENSE("GPL");