blob: ed7aa0a5accad039fe5bca8e651bfca0246d5636 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * sonic.c
3 *
Finn Thainefcce832005-08-20 15:53:22 +10004 * (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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
Jeff Garzik6aa20a22006-09-13 13:24:59 -040010 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * This driver is based on work from Andreas Busse, but most of
12 * the code is rewritten.
Jeff Garzik6aa20a22006-09-13 13:24:59 -040013 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
15 *
16 * Core code included by system sonic drivers
Finn Thainefcce832005-08-20 15:53:22 +100017 *
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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 */
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.
Finn Thainefcce832005-08-20 15:53:22 +100030 *
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".
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 */
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 */
45static int sonic_open(struct net_device *dev)
46{
Finn Thainefcce832005-08-20 15:53:22 +100047 struct sonic_local *lp = netdev_priv(dev);
48 int i;
Jeff Garzik6aa20a22006-09-13 13:24:59 -040049
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 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.
Finn Thainefcce832005-08-20 15:53:22 +100062 *
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".
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 */
Finn Thainefcce832005-08-20 15:53:22 +100071 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 return -EAGAIN;
74 }
75
Finn Thainefcce832005-08-20 15:53:22 +100076 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 /*
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 */
132static int sonic_close(struct net_device *dev)
133{
Finn Thainefcce832005-08-20 15:53:22 +1000134 struct sonic_local *lp = netdev_priv(dev);
135 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 SONIC_WRITE(SONIC_IMR, 0);
Finn Thainefcce832005-08-20 15:53:22 +1000146 SONIC_WRITE(SONIC_ISR, 0x7fff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
148
Finn Thainefcce832005-08-20 15:53:22 +1000149 /* 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
175 return 0;
176}
177
178static void sonic_tx_timeout(struct net_device *dev)
179{
Finn Thainefcce832005-08-20 15:53:22 +1000180 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 /* 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
Finn Thainefcce832005-08-20 15:53:22 +1000204 *
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.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 */
Finn Thainefcce832005-08-20 15:53:22 +1000221
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
223{
Finn Thainefcce832005-08-20 15:53:22 +1000224 struct sonic_local *lp = netdev_priv(dev);
225 dma_addr_t laddr;
226 int length;
227 int entry = lp->next_tx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
229 if (sonic_debug > 2)
230 printk("sonic_send_packet: skb=%p, dev=%p\n", skb, dev);
231
Finn Thainefcce832005-08-20 15:53:22 +1000232 length = skb->len;
233 if (length < ETH_ZLEN) {
Herbert Xu5b057c62006-06-23 02:06:41 -0700234 if (skb_padto(skb, ETH_ZLEN))
Finn Thainefcce832005-08-20 15:53:22 +1000235 return 0;
236 length = ETH_ZLEN;
237 }
238
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 /*
240 * Map the packet data into the logical DMA address space
241 */
Finn Thainefcce832005-08-20 15:53:22 +1000242
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 dev_kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 return 1;
248 }
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400249
Finn Thainefcce832005-08-20 15:53:22 +1000250 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 lp->tx_laddr[entry] = laddr;
266 lp->tx_skb[entry] = skb;
267
Finn Thainefcce832005-08-20 15:53:22 +1000268 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Finn Thainefcce832005-08-20 15:53:22 +1000273 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
282 if (sonic_debug > 2)
Finn Thainefcce832005-08-20 15:53:22 +1000283 printk("sonic_send_packet: issuing Tx command\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285 SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);
286
287 dev->trans_start = jiffies;
288
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 return 0;
290}
291
292/*
293 * The typical workload of the driver:
294 * Handle the network interface interrupts.
295 */
David Howells7d12e782006-10-05 14:55:46 +0100296static irqreturn_t sonic_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297{
Jeff Garzikc31f28e2006-10-06 14:56:04 -0400298 struct net_device *dev = dev_id;
Finn Thainefcce832005-08-20 15:53:22 +1000299 struct sonic_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 int status;
301
Finn Thainefcce832005-08-20 15:53:22 +1000302 if (!(status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT))
303 return IRQ_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Finn Thainefcce832005-08-20 15:53:22 +1000305 do {
306 if (status & SONIC_INT_PKTRX) {
307 if (sonic_debug > 2)
308 printk("%s: packet rx\n", dev->name);
309 sonic_rx(dev); /* got packet(s) */
310 SONIC_WRITE(SONIC_ISR, SONIC_INT_PKTRX); /* clear the interrupt */
311 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
Finn Thainefcce832005-08-20 15:53:22 +1000313 if (status & SONIC_INT_TXDN) {
314 int entry = lp->cur_tx;
315 int td_status;
316 int freed_some = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
Finn Thainefcce832005-08-20 15:53:22 +1000318 /* At this point, cur_tx is the index of a TD that is one of:
319 * unallocated/freed (status set & tx_skb[entry] clear)
320 * allocated and sent (status set & tx_skb[entry] set )
321 * allocated and not yet sent (status clear & tx_skb[entry] set )
322 * still being allocated by sonic_send_packet (status clear & tx_skb[entry] clear)
323 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Finn Thainefcce832005-08-20 15:53:22 +1000325 if (sonic_debug > 2)
326 printk("%s: tx done\n", dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
Finn Thainefcce832005-08-20 15:53:22 +1000328 while (lp->tx_skb[entry] != NULL) {
329 if ((td_status = sonic_tda_get(dev, entry, SONIC_TD_STATUS)) == 0)
330 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Finn Thainefcce832005-08-20 15:53:22 +1000332 if (td_status & 0x0001) {
333 lp->stats.tx_packets++;
334 lp->stats.tx_bytes += sonic_tda_get(dev, entry, SONIC_TD_PKTSIZE);
335 } else {
336 lp->stats.tx_errors++;
337 if (td_status & 0x0642)
338 lp->stats.tx_aborted_errors++;
339 if (td_status & 0x0180)
340 lp->stats.tx_carrier_errors++;
341 if (td_status & 0x0020)
342 lp->stats.tx_window_errors++;
343 if (td_status & 0x0004)
344 lp->stats.tx_fifo_errors++;
345 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
Finn Thainefcce832005-08-20 15:53:22 +1000347 /* We must free the original skb */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 dev_kfree_skb_irq(lp->tx_skb[entry]);
Finn Thainefcce832005-08-20 15:53:22 +1000349 lp->tx_skb[entry] = NULL;
350 /* and unmap DMA buffer */
351 dma_unmap_single(lp->device, lp->tx_laddr[entry], lp->tx_len[entry], DMA_TO_DEVICE);
352 lp->tx_laddr[entry] = (dma_addr_t)0;
353 freed_some = 1;
354
355 if (sonic_tda_get(dev, entry, SONIC_TD_LINK) & SONIC_EOL) {
356 entry = (entry + 1) & SONIC_TDS_MASK;
357 break;
358 }
359 entry = (entry + 1) & SONIC_TDS_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 }
Finn Thainefcce832005-08-20 15:53:22 +1000361
362 if (freed_some || lp->tx_skb[entry] == NULL)
363 netif_wake_queue(dev); /* The ring is no longer full */
364 lp->cur_tx = entry;
365 SONIC_WRITE(SONIC_ISR, SONIC_INT_TXDN); /* clear the interrupt */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 }
367
Finn Thainefcce832005-08-20 15:53:22 +1000368 /*
369 * check error conditions
370 */
371 if (status & SONIC_INT_RFO) {
372 if (sonic_debug > 1)
373 printk("%s: rx fifo overrun\n", dev->name);
374 lp->stats.rx_fifo_errors++;
375 SONIC_WRITE(SONIC_ISR, SONIC_INT_RFO); /* clear the interrupt */
376 }
377 if (status & SONIC_INT_RDE) {
378 if (sonic_debug > 1)
379 printk("%s: rx descriptors exhausted\n", dev->name);
380 lp->stats.rx_dropped++;
381 SONIC_WRITE(SONIC_ISR, SONIC_INT_RDE); /* clear the interrupt */
382 }
383 if (status & SONIC_INT_RBAE) {
384 if (sonic_debug > 1)
385 printk("%s: rx buffer area exceeded\n", dev->name);
386 lp->stats.rx_dropped++;
387 SONIC_WRITE(SONIC_ISR, SONIC_INT_RBAE); /* clear the interrupt */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 }
389
Finn Thainefcce832005-08-20 15:53:22 +1000390 /* counter overruns; all counters are 16bit wide */
391 if (status & SONIC_INT_FAE) {
392 lp->stats.rx_frame_errors += 65536;
393 SONIC_WRITE(SONIC_ISR, SONIC_INT_FAE); /* clear the interrupt */
394 }
395 if (status & SONIC_INT_CRC) {
396 lp->stats.rx_crc_errors += 65536;
397 SONIC_WRITE(SONIC_ISR, SONIC_INT_CRC); /* clear the interrupt */
398 }
399 if (status & SONIC_INT_MP) {
400 lp->stats.rx_missed_errors += 65536;
401 SONIC_WRITE(SONIC_ISR, SONIC_INT_MP); /* clear the interrupt */
402 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Finn Thainefcce832005-08-20 15:53:22 +1000404 /* transmit error */
405 if (status & SONIC_INT_TXER) {
406 if ((SONIC_READ(SONIC_TCR) & SONIC_TCR_FU) && (sonic_debug > 2))
407 printk(KERN_ERR "%s: tx fifo underrun\n", dev->name);
408 SONIC_WRITE(SONIC_ISR, SONIC_INT_TXER); /* clear the interrupt */
409 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Finn Thainefcce832005-08-20 15:53:22 +1000411 /* bus retry */
412 if (status & SONIC_INT_BR) {
413 printk(KERN_ERR "%s: Bus retry occurred! Device interrupt disabled.\n",
414 dev->name);
415 /* ... to help debug DMA problems causing endless interrupts. */
416 /* Bounce the eth interface to turn on the interrupt again. */
417 SONIC_WRITE(SONIC_IMR, 0);
418 SONIC_WRITE(SONIC_ISR, SONIC_INT_BR); /* clear the interrupt */
419 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Finn Thainefcce832005-08-20 15:53:22 +1000421 /* load CAM done */
422 if (status & SONIC_INT_LCD)
423 SONIC_WRITE(SONIC_ISR, SONIC_INT_LCD); /* clear the interrupt */
424 } while((status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 return IRQ_HANDLED;
426}
427
428/*
Finn Thainefcce832005-08-20 15:53:22 +1000429 * We have a good packet(s), pass it/them up the network stack.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 */
431static void sonic_rx(struct net_device *dev)
432{
Finn Thainefcce832005-08-20 15:53:22 +1000433 struct sonic_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 int status;
Finn Thainefcce832005-08-20 15:53:22 +1000435 int entry = lp->cur_rx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
Finn Thainefcce832005-08-20 15:53:22 +1000437 while (sonic_rda_get(dev, entry, SONIC_RD_IN_USE) == 0) {
438 struct sk_buff *used_skb;
439 struct sk_buff *new_skb;
440 dma_addr_t new_laddr;
441 u16 bufadr_l;
442 u16 bufadr_h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 int pkt_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Finn Thainefcce832005-08-20 15:53:22 +1000445 status = sonic_rda_get(dev, entry, SONIC_RD_STATUS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 if (status & SONIC_RCR_PRX) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 /* Malloc up new buffer. */
Finn Thainefcce832005-08-20 15:53:22 +1000448 new_skb = dev_alloc_skb(SONIC_RBSIZE + 2);
449 if (new_skb == NULL) {
450 printk(KERN_ERR "%s: Memory squeeze, dropping packet.\n", dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 lp->stats.rx_dropped++;
452 break;
453 }
Finn Thainefcce832005-08-20 15:53:22 +1000454 new_skb->dev = dev;
455 /* provide 16 byte IP header alignment unless DMA requires otherwise */
456 if(SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400457 skb_reserve(new_skb, 2);
Finn Thainefcce832005-08-20 15:53:22 +1000458
459 new_laddr = dma_map_single(lp->device, skb_put(new_skb, SONIC_RBSIZE),
460 SONIC_RBSIZE, DMA_FROM_DEVICE);
461 if (!new_laddr) {
462 dev_kfree_skb(new_skb);
463 printk(KERN_ERR "%s: Failed to map rx buffer, dropping packet.\n", dev->name);
464 lp->stats.rx_dropped++;
465 break;
466 }
467
468 /* now we have a new skb to replace it, pass the used one up the stack */
469 dma_unmap_single(lp->device, lp->rx_laddr[entry], SONIC_RBSIZE, DMA_FROM_DEVICE);
470 used_skb = lp->rx_skb[entry];
471 pkt_len = sonic_rda_get(dev, entry, SONIC_RD_PKTLEN);
472 skb_trim(used_skb, pkt_len);
473 used_skb->protocol = eth_type_trans(used_skb, dev);
474 netif_rx(used_skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 dev->last_rx = jiffies;
476 lp->stats.rx_packets++;
477 lp->stats.rx_bytes += pkt_len;
478
Finn Thainefcce832005-08-20 15:53:22 +1000479 /* and insert the new skb */
480 lp->rx_laddr[entry] = new_laddr;
481 lp->rx_skb[entry] = new_skb;
482
483 bufadr_l = (unsigned long)new_laddr & 0xffff;
484 bufadr_h = (unsigned long)new_laddr >> 16;
485 sonic_rra_put(dev, entry, SONIC_RR_BUFADR_L, bufadr_l);
486 sonic_rra_put(dev, entry, SONIC_RR_BUFADR_H, bufadr_h);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 } else {
488 /* This should only happen, if we enable accepting broken packets. */
489 lp->stats.rx_errors++;
490 if (status & SONIC_RCR_FAER)
491 lp->stats.rx_frame_errors++;
492 if (status & SONIC_RCR_CRCR)
493 lp->stats.rx_crc_errors++;
494 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 if (status & SONIC_RCR_LPKT) {
496 /*
Finn Thainefcce832005-08-20 15:53:22 +1000497 * this was the last packet out of the current receive buffer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 * give the buffer back to the SONIC
499 */
Finn Thainefcce832005-08-20 15:53:22 +1000500 lp->cur_rwp += SIZEOF_SONIC_RR * SONIC_BUS_SCALE(lp->dma_bitmode);
501 if (lp->cur_rwp >= lp->rra_end) lp->cur_rwp = lp->rra_laddr & 0xffff;
502 SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
503 if (SONIC_READ(SONIC_ISR) & SONIC_INT_RBE) {
504 if (sonic_debug > 2)
505 printk("%s: rx buffer exhausted\n", dev->name);
506 SONIC_WRITE(SONIC_ISR, SONIC_INT_RBE); /* clear the flag */
507 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 } else
Finn Thainefcce832005-08-20 15:53:22 +1000509 printk(KERN_ERR "%s: rx desc without RCR_LPKT. Shouldn't happen !?\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 dev->name);
Finn Thainefcce832005-08-20 15:53:22 +1000511 /*
512 * give back the descriptor
513 */
514 sonic_rda_put(dev, entry, SONIC_RD_LINK,
515 sonic_rda_get(dev, entry, SONIC_RD_LINK) | SONIC_EOL);
516 sonic_rda_put(dev, entry, SONIC_RD_IN_USE, 1);
517 sonic_rda_put(dev, lp->eol_rx, SONIC_RD_LINK,
518 sonic_rda_get(dev, lp->eol_rx, SONIC_RD_LINK) & ~SONIC_EOL);
519 lp->eol_rx = entry;
520 lp->cur_rx = entry = (entry + 1) & SONIC_RDS_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 }
522 /*
Finn Thainefcce832005-08-20 15:53:22 +1000523 * If any worth-while packets have been received, netif_rx()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 * has done a mark_bh(NET_BH) for us and will work on them
525 * when we get to the bottom-half routine.
526 */
527}
528
529
530/*
531 * Get the current statistics.
532 * This may be called with the device open or closed.
533 */
534static struct net_device_stats *sonic_get_stats(struct net_device *dev)
535{
Finn Thainefcce832005-08-20 15:53:22 +1000536 struct sonic_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
538 /* read the tally counter from the SONIC and reset them */
539 lp->stats.rx_crc_errors += SONIC_READ(SONIC_CRCT);
540 SONIC_WRITE(SONIC_CRCT, 0xffff);
541 lp->stats.rx_frame_errors += SONIC_READ(SONIC_FAET);
542 SONIC_WRITE(SONIC_FAET, 0xffff);
543 lp->stats.rx_missed_errors += SONIC_READ(SONIC_MPT);
544 SONIC_WRITE(SONIC_MPT, 0xffff);
545
546 return &lp->stats;
547}
548
549
550/*
551 * Set or clear the multicast filter for this adaptor.
552 */
553static void sonic_multicast_list(struct net_device *dev)
554{
Finn Thainefcce832005-08-20 15:53:22 +1000555 struct sonic_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 unsigned int rcr;
557 struct dev_mc_list *dmi = dev->mc_list;
558 unsigned char *addr;
559 int i;
560
561 rcr = SONIC_READ(SONIC_RCR) & ~(SONIC_RCR_PRO | SONIC_RCR_AMC);
562 rcr |= SONIC_RCR_BRD; /* accept broadcast packets */
563
564 if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
565 rcr |= SONIC_RCR_PRO;
566 } else {
567 if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 15)) {
568 rcr |= SONIC_RCR_AMC;
569 } else {
570 if (sonic_debug > 2)
Finn Thainefcce832005-08-20 15:53:22 +1000571 printk("sonic_multicast_list: mc_count %d\n", dev->mc_count);
572 sonic_set_cam_enable(dev, 1); /* always enable our own address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 for (i = 1; i <= dev->mc_count; i++) {
574 addr = dmi->dmi_addr;
575 dmi = dmi->next;
Finn Thainefcce832005-08-20 15:53:22 +1000576 sonic_cda_put(dev, i, SONIC_CD_CAP0, addr[1] << 8 | addr[0]);
577 sonic_cda_put(dev, i, SONIC_CD_CAP1, addr[3] << 8 | addr[2]);
578 sonic_cda_put(dev, i, SONIC_CD_CAP2, addr[5] << 8 | addr[4]);
579 sonic_set_cam_enable(dev, sonic_get_cam_enable(dev) | (1 << i));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 }
581 SONIC_WRITE(SONIC_CDC, 16);
582 /* issue Load CAM command */
583 SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
584 SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
585 }
586 }
587
588 if (sonic_debug > 2)
589 printk("sonic_multicast_list: setting RCR=%x\n", rcr);
590
591 SONIC_WRITE(SONIC_RCR, rcr);
592}
593
594
595/*
596 * Initialize the SONIC ethernet controller.
597 */
598static int sonic_init(struct net_device *dev)
599{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 unsigned int cmd;
Finn Thainefcce832005-08-20 15:53:22 +1000601 struct sonic_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 int i;
603
604 /*
605 * put the Sonic into software-reset mode and
606 * disable all interrupts
607 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 SONIC_WRITE(SONIC_IMR, 0);
Finn Thainefcce832005-08-20 15:53:22 +1000609 SONIC_WRITE(SONIC_ISR, 0x7fff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
611
612 /*
613 * clear software reset flag, disable receiver, clear and
614 * enable interrupts, then completely initialize the SONIC
615 */
616 SONIC_WRITE(SONIC_CMD, 0);
617 SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS);
618
619 /*
620 * initialize the receive resource area
621 */
622 if (sonic_debug > 2)
623 printk("sonic_init: initialize receive resource area\n");
624
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 for (i = 0; i < SONIC_NUM_RRS; i++) {
Finn Thainefcce832005-08-20 15:53:22 +1000626 u16 bufadr_l = (unsigned long)lp->rx_laddr[i] & 0xffff;
627 u16 bufadr_h = (unsigned long)lp->rx_laddr[i] >> 16;
628 sonic_rra_put(dev, i, SONIC_RR_BUFADR_L, bufadr_l);
629 sonic_rra_put(dev, i, SONIC_RR_BUFADR_H, bufadr_h);
630 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_L, SONIC_RBSIZE >> 1);
631 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_H, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 }
633
634 /* initialize all RRA registers */
Finn Thainefcce832005-08-20 15:53:22 +1000635 lp->rra_end = (lp->rra_laddr + SONIC_NUM_RRS * SIZEOF_SONIC_RR *
636 SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
637 lp->cur_rwp = (lp->rra_laddr + (SONIC_NUM_RRS - 1) * SIZEOF_SONIC_RR *
638 SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400639
Finn Thainefcce832005-08-20 15:53:22 +1000640 SONIC_WRITE(SONIC_RSA, lp->rra_laddr & 0xffff);
641 SONIC_WRITE(SONIC_REA, lp->rra_end);
642 SONIC_WRITE(SONIC_RRP, lp->rra_laddr & 0xffff);
643 SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 SONIC_WRITE(SONIC_URRA, lp->rra_laddr >> 16);
Finn Thainefcce832005-08-20 15:53:22 +1000645 SONIC_WRITE(SONIC_EOBC, (SONIC_RBSIZE >> 1) - (lp->dma_bitmode ? 2 : 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
647 /* load the resource pointers */
648 if (sonic_debug > 3)
Finn Thainefcce832005-08-20 15:53:22 +1000649 printk("sonic_init: issuing RRRA command\n");
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400650
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 SONIC_WRITE(SONIC_CMD, SONIC_CR_RRRA);
652 i = 0;
653 while (i++ < 100) {
654 if (SONIC_READ(SONIC_CMD) & SONIC_CR_RRRA)
655 break;
656 }
657
658 if (sonic_debug > 2)
Finn Thainefcce832005-08-20 15:53:22 +1000659 printk("sonic_init: status=%x i=%d\n", SONIC_READ(SONIC_CMD), i);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400660
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 /*
662 * Initialize the receive descriptors so that they
663 * become a circular linked list, ie. let the last
664 * descriptor point to the first again.
665 */
666 if (sonic_debug > 2)
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400667 printk("sonic_init: initialize receive descriptors\n");
Finn Thainefcce832005-08-20 15:53:22 +1000668 for (i=0; i<SONIC_NUM_RDS; i++) {
669 sonic_rda_put(dev, i, SONIC_RD_STATUS, 0);
670 sonic_rda_put(dev, i, SONIC_RD_PKTLEN, 0);
671 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_L, 0);
672 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_H, 0);
673 sonic_rda_put(dev, i, SONIC_RD_SEQNO, 0);
674 sonic_rda_put(dev, i, SONIC_RD_IN_USE, 1);
675 sonic_rda_put(dev, i, SONIC_RD_LINK,
676 lp->rda_laddr +
677 ((i+1) * SIZEOF_SONIC_RD * SONIC_BUS_SCALE(lp->dma_bitmode)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 }
679 /* fix last descriptor */
Finn Thainefcce832005-08-20 15:53:22 +1000680 sonic_rda_put(dev, SONIC_NUM_RDS - 1, SONIC_RD_LINK,
681 (lp->rda_laddr & 0xffff) | SONIC_EOL);
682 lp->eol_rx = SONIC_NUM_RDS - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 lp->cur_rx = 0;
684 SONIC_WRITE(SONIC_URDA, lp->rda_laddr >> 16);
685 SONIC_WRITE(SONIC_CRDA, lp->rda_laddr & 0xffff);
686
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400687 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 * initialize transmit descriptors
689 */
690 if (sonic_debug > 2)
691 printk("sonic_init: initialize transmit descriptors\n");
692 for (i = 0; i < SONIC_NUM_TDS; i++) {
Finn Thainefcce832005-08-20 15:53:22 +1000693 sonic_tda_put(dev, i, SONIC_TD_STATUS, 0);
694 sonic_tda_put(dev, i, SONIC_TD_CONFIG, 0);
695 sonic_tda_put(dev, i, SONIC_TD_PKTSIZE, 0);
696 sonic_tda_put(dev, i, SONIC_TD_FRAG_COUNT, 0);
697 sonic_tda_put(dev, i, SONIC_TD_LINK,
698 (lp->tda_laddr & 0xffff) +
699 (i + 1) * SIZEOF_SONIC_TD * SONIC_BUS_SCALE(lp->dma_bitmode));
700 lp->tx_skb[i] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 }
Finn Thainefcce832005-08-20 15:53:22 +1000702 /* fix last descriptor */
703 sonic_tda_put(dev, SONIC_NUM_TDS - 1, SONIC_TD_LINK,
704 (lp->tda_laddr & 0xffff));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
706 SONIC_WRITE(SONIC_UTDA, lp->tda_laddr >> 16);
707 SONIC_WRITE(SONIC_CTDA, lp->tda_laddr & 0xffff);
Finn Thainefcce832005-08-20 15:53:22 +1000708 lp->cur_tx = lp->next_tx = 0;
709 lp->eol_tx = SONIC_NUM_TDS - 1;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400710
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 /*
712 * put our own address to CAM desc[0]
713 */
Finn Thainefcce832005-08-20 15:53:22 +1000714 sonic_cda_put(dev, 0, SONIC_CD_CAP0, dev->dev_addr[1] << 8 | dev->dev_addr[0]);
715 sonic_cda_put(dev, 0, SONIC_CD_CAP1, dev->dev_addr[3] << 8 | dev->dev_addr[2]);
716 sonic_cda_put(dev, 0, SONIC_CD_CAP2, dev->dev_addr[5] << 8 | dev->dev_addr[4]);
717 sonic_set_cam_enable(dev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718
719 for (i = 0; i < 16; i++)
Finn Thainefcce832005-08-20 15:53:22 +1000720 sonic_cda_put(dev, i, SONIC_CD_ENTRY_POINTER, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
722 /*
723 * initialize CAM registers
724 */
725 SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
726 SONIC_WRITE(SONIC_CDC, 16);
727
728 /*
729 * load the CAM
730 */
731 SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
732
733 i = 0;
734 while (i++ < 100) {
735 if (SONIC_READ(SONIC_ISR) & SONIC_INT_LCD)
736 break;
737 }
738 if (sonic_debug > 2) {
Finn Thainefcce832005-08-20 15:53:22 +1000739 printk("sonic_init: CMD=%x, ISR=%x\n, i=%d",
740 SONIC_READ(SONIC_CMD), SONIC_READ(SONIC_ISR), i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 }
742
743 /*
744 * enable receiver, disable loopback
745 * and enable all interrupts
746 */
747 SONIC_WRITE(SONIC_CMD, SONIC_CR_RXEN | SONIC_CR_STP);
748 SONIC_WRITE(SONIC_RCR, SONIC_RCR_DEFAULT);
749 SONIC_WRITE(SONIC_TCR, SONIC_TCR_DEFAULT);
750 SONIC_WRITE(SONIC_ISR, 0x7fff);
751 SONIC_WRITE(SONIC_IMR, SONIC_IMR_DEFAULT);
752
753 cmd = SONIC_READ(SONIC_CMD);
754 if ((cmd & SONIC_CR_RXEN) == 0 || (cmd & SONIC_CR_STP) == 0)
Finn Thainefcce832005-08-20 15:53:22 +1000755 printk(KERN_ERR "sonic_init: failed, status=%x\n", cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
757 if (sonic_debug > 2)
758 printk("sonic_init: new status=%x\n",
759 SONIC_READ(SONIC_CMD));
760
761 return 0;
762}
763
764MODULE_LICENSE("GPL");