Merge branch 'master' of /home/davem/src/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         for (i = 0; i < SONIC_NUM_RRS; i++) {
54                 struct sk_buff *skb = dev_alloc_skb(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;
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 0;
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 1;
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         dev->trans_start = jiffies;
267
268         return 0;
269 }
270
271 /*
272  * The typical workload of the driver:
273  * Handle the network interface interrupts.
274  */
275 static irqreturn_t sonic_interrupt(int irq, void *dev_id)
276 {
277         struct net_device *dev = dev_id;
278         struct sonic_local *lp = netdev_priv(dev);
279         int status;
280
281         if (!(status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT))
282                 return IRQ_NONE;
283
284         do {
285                 if (status & SONIC_INT_PKTRX) {
286                         if (sonic_debug > 2)
287                                 printk("%s: packet rx\n", dev->name);
288                         sonic_rx(dev);  /* got packet(s) */
289                         SONIC_WRITE(SONIC_ISR, SONIC_INT_PKTRX); /* clear the interrupt */
290                 }
291
292                 if (status & SONIC_INT_TXDN) {
293                         int entry = lp->cur_tx;
294                         int td_status;
295                         int freed_some = 0;
296
297                         /* At this point, cur_tx is the index of a TD that is one of:
298                          *   unallocated/freed                          (status set   & tx_skb[entry] clear)
299                          *   allocated and sent                         (status set   & tx_skb[entry] set  )
300                          *   allocated and not yet sent                 (status clear & tx_skb[entry] set  )
301                          *   still being allocated by sonic_send_packet (status clear & tx_skb[entry] clear)
302                          */
303
304                         if (sonic_debug > 2)
305                                 printk("%s: tx done\n", dev->name);
306
307                         while (lp->tx_skb[entry] != NULL) {
308                                 if ((td_status = sonic_tda_get(dev, entry, SONIC_TD_STATUS)) == 0)
309                                         break;
310
311                                 if (td_status & 0x0001) {
312                                         lp->stats.tx_packets++;
313                                         lp->stats.tx_bytes += sonic_tda_get(dev, entry, SONIC_TD_PKTSIZE);
314                                 } else {
315                                         lp->stats.tx_errors++;
316                                         if (td_status & 0x0642)
317                                                 lp->stats.tx_aborted_errors++;
318                                         if (td_status & 0x0180)
319                                                 lp->stats.tx_carrier_errors++;
320                                         if (td_status & 0x0020)
321                                                 lp->stats.tx_window_errors++;
322                                         if (td_status & 0x0004)
323                                                 lp->stats.tx_fifo_errors++;
324                                 }
325
326                                 /* We must free the original skb */
327                                 dev_kfree_skb_irq(lp->tx_skb[entry]);
328                                 lp->tx_skb[entry] = NULL;
329                                 /* and unmap DMA buffer */
330                                 dma_unmap_single(lp->device, lp->tx_laddr[entry], lp->tx_len[entry], DMA_TO_DEVICE);
331                                 lp->tx_laddr[entry] = (dma_addr_t)0;
332                                 freed_some = 1;
333
334                                 if (sonic_tda_get(dev, entry, SONIC_TD_LINK) & SONIC_EOL) {
335                                         entry = (entry + 1) & SONIC_TDS_MASK;
336                                         break;
337                                 }
338                                 entry = (entry + 1) & SONIC_TDS_MASK;
339                         }
340
341                         if (freed_some || lp->tx_skb[entry] == NULL)
342                                 netif_wake_queue(dev);  /* The ring is no longer full */
343                         lp->cur_tx = entry;
344                         SONIC_WRITE(SONIC_ISR, SONIC_INT_TXDN); /* clear the interrupt */
345                 }
346
347                 /*
348                  * check error conditions
349                  */
350                 if (status & SONIC_INT_RFO) {
351                         if (sonic_debug > 1)
352                                 printk("%s: rx fifo overrun\n", dev->name);
353                         lp->stats.rx_fifo_errors++;
354                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RFO); /* clear the interrupt */
355                 }
356                 if (status & SONIC_INT_RDE) {
357                         if (sonic_debug > 1)
358                                 printk("%s: rx descriptors exhausted\n", dev->name);
359                         lp->stats.rx_dropped++;
360                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RDE); /* clear the interrupt */
361                 }
362                 if (status & SONIC_INT_RBAE) {
363                         if (sonic_debug > 1)
364                                 printk("%s: rx buffer area exceeded\n", dev->name);
365                         lp->stats.rx_dropped++;
366                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RBAE); /* clear the interrupt */
367                 }
368
369                 /* counter overruns; all counters are 16bit wide */
370                 if (status & SONIC_INT_FAE) {
371                         lp->stats.rx_frame_errors += 65536;
372                         SONIC_WRITE(SONIC_ISR, SONIC_INT_FAE); /* clear the interrupt */
373                 }
374                 if (status & SONIC_INT_CRC) {
375                         lp->stats.rx_crc_errors += 65536;
376                         SONIC_WRITE(SONIC_ISR, SONIC_INT_CRC); /* clear the interrupt */
377                 }
378                 if (status & SONIC_INT_MP) {
379                         lp->stats.rx_missed_errors += 65536;
380                         SONIC_WRITE(SONIC_ISR, SONIC_INT_MP); /* clear the interrupt */
381                 }
382
383                 /* transmit error */
384                 if (status & SONIC_INT_TXER) {
385                         if ((SONIC_READ(SONIC_TCR) & SONIC_TCR_FU) && (sonic_debug > 2))
386                                 printk(KERN_ERR "%s: tx fifo underrun\n", dev->name);
387                         SONIC_WRITE(SONIC_ISR, SONIC_INT_TXER); /* clear the interrupt */
388                 }
389
390                 /* bus retry */
391                 if (status & SONIC_INT_BR) {
392                         printk(KERN_ERR "%s: Bus retry occurred! Device interrupt disabled.\n",
393                                 dev->name);
394                         /* ... to help debug DMA problems causing endless interrupts. */
395                         /* Bounce the eth interface to turn on the interrupt again. */
396                         SONIC_WRITE(SONIC_IMR, 0);
397                         SONIC_WRITE(SONIC_ISR, SONIC_INT_BR); /* clear the interrupt */
398                 }
399
400                 /* load CAM done */
401                 if (status & SONIC_INT_LCD)
402                         SONIC_WRITE(SONIC_ISR, SONIC_INT_LCD); /* clear the interrupt */
403         } while((status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT));
404         return IRQ_HANDLED;
405 }
406
407 /*
408  * We have a good packet(s), pass it/them up the network stack.
409  */
410 static void sonic_rx(struct net_device *dev)
411 {
412         struct sonic_local *lp = netdev_priv(dev);
413         int status;
414         int entry = lp->cur_rx;
415
416         while (sonic_rda_get(dev, entry, SONIC_RD_IN_USE) == 0) {
417                 struct sk_buff *used_skb;
418                 struct sk_buff *new_skb;
419                 dma_addr_t new_laddr;
420                 u16 bufadr_l;
421                 u16 bufadr_h;
422                 int pkt_len;
423
424                 status = sonic_rda_get(dev, entry, SONIC_RD_STATUS);
425                 if (status & SONIC_RCR_PRX) {
426                         /* Malloc up new buffer. */
427                         new_skb = dev_alloc_skb(SONIC_RBSIZE + 2);
428                         if (new_skb == NULL) {
429                                 printk(KERN_ERR "%s: Memory squeeze, dropping packet.\n", dev->name);
430                                 lp->stats.rx_dropped++;
431                                 break;
432                         }
433                         /* provide 16 byte IP header alignment unless DMA requires otherwise */
434                         if(SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
435                                 skb_reserve(new_skb, 2);
436
437                         new_laddr = dma_map_single(lp->device, skb_put(new_skb, SONIC_RBSIZE),
438                                                SONIC_RBSIZE, DMA_FROM_DEVICE);
439                         if (!new_laddr) {
440                                 dev_kfree_skb(new_skb);
441                                 printk(KERN_ERR "%s: Failed to map rx buffer, dropping packet.\n", dev->name);
442                                 lp->stats.rx_dropped++;
443                                 break;
444                         }
445
446                         /* now we have a new skb to replace it, pass the used one up the stack */
447                         dma_unmap_single(lp->device, lp->rx_laddr[entry], SONIC_RBSIZE, DMA_FROM_DEVICE);
448                         used_skb = lp->rx_skb[entry];
449                         pkt_len = sonic_rda_get(dev, entry, SONIC_RD_PKTLEN);
450                         skb_trim(used_skb, pkt_len);
451                         used_skb->protocol = eth_type_trans(used_skb, dev);
452                         netif_rx(used_skb);
453                         lp->stats.rx_packets++;
454                         lp->stats.rx_bytes += pkt_len;
455
456                         /* and insert the new skb */
457                         lp->rx_laddr[entry] = new_laddr;
458                         lp->rx_skb[entry] = new_skb;
459
460                         bufadr_l = (unsigned long)new_laddr & 0xffff;
461                         bufadr_h = (unsigned long)new_laddr >> 16;
462                         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_L, bufadr_l);
463                         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_H, bufadr_h);
464                 } else {
465                         /* This should only happen, if we enable accepting broken packets. */
466                         lp->stats.rx_errors++;
467                         if (status & SONIC_RCR_FAER)
468                                 lp->stats.rx_frame_errors++;
469                         if (status & SONIC_RCR_CRCR)
470                                 lp->stats.rx_crc_errors++;
471                 }
472                 if (status & SONIC_RCR_LPKT) {
473                         /*
474                          * this was the last packet out of the current receive buffer
475                          * give the buffer back to the SONIC
476                          */
477                         lp->cur_rwp += SIZEOF_SONIC_RR * SONIC_BUS_SCALE(lp->dma_bitmode);
478                         if (lp->cur_rwp >= lp->rra_end) lp->cur_rwp = lp->rra_laddr & 0xffff;
479                         SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
480                         if (SONIC_READ(SONIC_ISR) & SONIC_INT_RBE) {
481                                 if (sonic_debug > 2)
482                                         printk("%s: rx buffer exhausted\n", dev->name);
483                                 SONIC_WRITE(SONIC_ISR, SONIC_INT_RBE); /* clear the flag */
484                         }
485                 } else
486                         printk(KERN_ERR "%s: rx desc without RCR_LPKT. Shouldn't happen !?\n",
487                              dev->name);
488                 /*
489                  * give back the descriptor
490                  */
491                 sonic_rda_put(dev, entry, SONIC_RD_LINK,
492                         sonic_rda_get(dev, entry, SONIC_RD_LINK) | SONIC_EOL);
493                 sonic_rda_put(dev, entry, SONIC_RD_IN_USE, 1);
494                 sonic_rda_put(dev, lp->eol_rx, SONIC_RD_LINK,
495                         sonic_rda_get(dev, lp->eol_rx, SONIC_RD_LINK) & ~SONIC_EOL);
496                 lp->eol_rx = entry;
497                 lp->cur_rx = entry = (entry + 1) & SONIC_RDS_MASK;
498         }
499         /*
500          * If any worth-while packets have been received, netif_rx()
501          * has done a mark_bh(NET_BH) for us and will work on them
502          * when we get to the bottom-half routine.
503          */
504 }
505
506
507 /*
508  * Get the current statistics.
509  * This may be called with the device open or closed.
510  */
511 static struct net_device_stats *sonic_get_stats(struct net_device *dev)
512 {
513         struct sonic_local *lp = netdev_priv(dev);
514
515         /* read the tally counter from the SONIC and reset them */
516         lp->stats.rx_crc_errors += SONIC_READ(SONIC_CRCT);
517         SONIC_WRITE(SONIC_CRCT, 0xffff);
518         lp->stats.rx_frame_errors += SONIC_READ(SONIC_FAET);
519         SONIC_WRITE(SONIC_FAET, 0xffff);
520         lp->stats.rx_missed_errors += SONIC_READ(SONIC_MPT);
521         SONIC_WRITE(SONIC_MPT, 0xffff);
522
523         return &lp->stats;
524 }
525
526
527 /*
528  * Set or clear the multicast filter for this adaptor.
529  */
530 static void sonic_multicast_list(struct net_device *dev)
531 {
532         struct sonic_local *lp = netdev_priv(dev);
533         unsigned int rcr;
534         struct dev_mc_list *dmi = dev->mc_list;
535         unsigned char *addr;
536         int i;
537
538         rcr = SONIC_READ(SONIC_RCR) & ~(SONIC_RCR_PRO | SONIC_RCR_AMC);
539         rcr |= SONIC_RCR_BRD;   /* accept broadcast packets */
540
541         if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
542                 rcr |= SONIC_RCR_PRO;
543         } else {
544                 if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 15)) {
545                         rcr |= SONIC_RCR_AMC;
546                 } else {
547                         if (sonic_debug > 2)
548                                 printk("sonic_multicast_list: mc_count %d\n", dev->mc_count);
549                         sonic_set_cam_enable(dev, 1);  /* always enable our own address */
550                         for (i = 1; i <= dev->mc_count; i++) {
551                                 addr = dmi->dmi_addr;
552                                 dmi = dmi->next;
553                                 sonic_cda_put(dev, i, SONIC_CD_CAP0, addr[1] << 8 | addr[0]);
554                                 sonic_cda_put(dev, i, SONIC_CD_CAP1, addr[3] << 8 | addr[2]);
555                                 sonic_cda_put(dev, i, SONIC_CD_CAP2, addr[5] << 8 | addr[4]);
556                                 sonic_set_cam_enable(dev, sonic_get_cam_enable(dev) | (1 << 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");