Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * sonic.c | |
4 | * | |
efcce839 FT |
5 | * (C) 2005 Finn Thain |
6 | * | |
7 | * Converted to DMA API, added zero-copy buffer handling, and | |
8 | * (from the mac68k project) introduced dhd's support for 16-bit cards. | |
9 | * | |
1da177e4 | 10 | * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de) |
6aa20a22 | 11 | * |
1da177e4 LT |
12 | * This driver is based on work from Andreas Busse, but most of |
13 | * the code is rewritten. | |
6aa20a22 | 14 | * |
1da177e4 LT |
15 | * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de) |
16 | * | |
17 | * Core code included by system sonic drivers | |
efcce839 FT |
18 | * |
19 | * And... partially rewritten again by David Huggins-Daines in order | |
20 | * to cope with screwed up Macintosh NICs that may or may not use | |
21 | * 16-bit DMA. | |
22 | * | |
23 | * (C) 1999 David Huggins-Daines <dhd@debian.org> | |
24 | * | |
1da177e4 LT |
25 | */ |
26 | ||
27 | /* | |
28 | * Sources: Olivetti M700-10 Risc Personal Computer hardware handbook, | |
29 | * National Semiconductors data sheet for the DP83932B Sonic Ethernet | |
30 | * controller, and the files "8390.c" and "skeleton.c" in this directory. | |
efcce839 FT |
31 | * |
32 | * Additional sources: Nat Semi data sheet for the DP83932C and Nat Semi | |
33 | * Application Note AN-746, the files "lance.c" and "ibmlana.c". See also | |
34 | * the NetBSD file "sys/arch/mac68k/dev/if_sn.c". | |
1da177e4 LT |
35 | */ |
36 | ||
995b2a65 | 37 | static unsigned int version_printed; |
1da177e4 | 38 | |
995b2a65 FT |
39 | static int sonic_debug = -1; |
40 | module_param(sonic_debug, int, 0); | |
41 | MODULE_PARM_DESC(sonic_debug, "debug message level"); | |
42 | ||
43 | static void sonic_msg_init(struct net_device *dev) | |
44 | { | |
45 | struct sonic_local *lp = netdev_priv(dev); | |
46 | ||
47 | lp->msg_enable = netif_msg_init(sonic_debug, 0); | |
48 | ||
49 | if (version_printed++ == 0) | |
50 | netif_dbg(lp, drv, dev, "%s", version); | |
51 | } | |
1da177e4 | 52 | |
5d58c21c FT |
53 | static int sonic_alloc_descriptors(struct net_device *dev) |
54 | { | |
55 | struct sonic_local *lp = netdev_priv(dev); | |
56 | ||
57 | /* Allocate a chunk of memory for the descriptors. Note that this | |
58 | * must not cross a 64K boundary. It is smaller than one page which | |
59 | * means that page alignment is a sufficient condition. | |
60 | */ | |
61 | lp->descriptors = | |
62 | dma_alloc_coherent(lp->device, | |
63 | SIZEOF_SONIC_DESC * | |
64 | SONIC_BUS_SCALE(lp->dma_bitmode), | |
65 | &lp->descriptors_laddr, GFP_KERNEL); | |
66 | ||
67 | if (!lp->descriptors) | |
68 | return -ENOMEM; | |
69 | ||
70 | lp->cda = lp->descriptors; | |
71 | lp->tda = lp->cda + SIZEOF_SONIC_CDA * | |
72 | SONIC_BUS_SCALE(lp->dma_bitmode); | |
73 | lp->rda = lp->tda + SIZEOF_SONIC_TD * SONIC_NUM_TDS * | |
74 | SONIC_BUS_SCALE(lp->dma_bitmode); | |
75 | lp->rra = lp->rda + SIZEOF_SONIC_RD * SONIC_NUM_RDS * | |
76 | SONIC_BUS_SCALE(lp->dma_bitmode); | |
77 | ||
78 | lp->cda_laddr = lp->descriptors_laddr; | |
79 | lp->tda_laddr = lp->cda_laddr + SIZEOF_SONIC_CDA * | |
80 | SONIC_BUS_SCALE(lp->dma_bitmode); | |
81 | lp->rda_laddr = lp->tda_laddr + SIZEOF_SONIC_TD * SONIC_NUM_TDS * | |
82 | SONIC_BUS_SCALE(lp->dma_bitmode); | |
83 | lp->rra_laddr = lp->rda_laddr + SIZEOF_SONIC_RD * SONIC_NUM_RDS * | |
84 | SONIC_BUS_SCALE(lp->dma_bitmode); | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
1da177e4 LT |
89 | /* |
90 | * Open/initialize the SONIC controller. | |
91 | * | |
92 | * This routine should set everything up anew at each open, even | |
93 | * registers that "should" only need to be set once at boot, so that | |
94 | * there is non-reboot way to recover if something goes wrong. | |
95 | */ | |
96 | static int sonic_open(struct net_device *dev) | |
97 | { | |
efcce839 FT |
98 | struct sonic_local *lp = netdev_priv(dev); |
99 | int i; | |
6aa20a22 | 100 | |
995b2a65 | 101 | netif_dbg(lp, ifup, dev, "%s: initializing sonic driver\n", __func__); |
1da177e4 | 102 | |
865ad2f2 FT |
103 | spin_lock_init(&lp->lock); |
104 | ||
efcce839 | 105 | for (i = 0; i < SONIC_NUM_RRS; i++) { |
c056b734 | 106 | struct sk_buff *skb = netdev_alloc_skb(dev, SONIC_RBSIZE + 2); |
efcce839 FT |
107 | if (skb == NULL) { |
108 | while(i > 0) { /* free any that were allocated successfully */ | |
109 | i--; | |
110 | dev_kfree_skb(lp->rx_skb[i]); | |
111 | lp->rx_skb[i] = NULL; | |
112 | } | |
113 | printk(KERN_ERR "%s: couldn't allocate receive buffers\n", | |
114 | dev->name); | |
115 | return -ENOMEM; | |
116 | } | |
efcce839 FT |
117 | /* align IP header unless DMA requires otherwise */ |
118 | if (SONIC_BUS_SCALE(lp->dma_bitmode) == 2) | |
119 | skb_reserve(skb, 2); | |
120 | lp->rx_skb[i] = skb; | |
121 | } | |
122 | ||
123 | for (i = 0; i < SONIC_NUM_RRS; i++) { | |
124 | dma_addr_t laddr = dma_map_single(lp->device, skb_put(lp->rx_skb[i], SONIC_RBSIZE), | |
125 | SONIC_RBSIZE, DMA_FROM_DEVICE); | |
26de0b76 | 126 | if (dma_mapping_error(lp->device, laddr)) { |
efcce839 FT |
127 | while(i > 0) { /* free any that were mapped successfully */ |
128 | i--; | |
129 | dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE); | |
130 | lp->rx_laddr[i] = (dma_addr_t)0; | |
131 | } | |
132 | for (i = 0; i < SONIC_NUM_RRS; i++) { | |
133 | dev_kfree_skb(lp->rx_skb[i]); | |
134 | lp->rx_skb[i] = NULL; | |
135 | } | |
136 | printk(KERN_ERR "%s: couldn't map rx DMA buffers\n", | |
137 | dev->name); | |
138 | return -ENOMEM; | |
139 | } | |
140 | lp->rx_laddr[i] = laddr; | |
141 | } | |
142 | ||
1da177e4 LT |
143 | /* |
144 | * Initialize the SONIC | |
145 | */ | |
606dbf8d | 146 | sonic_init(dev, true); |
1da177e4 LT |
147 | |
148 | netif_start_queue(dev); | |
149 | ||
995b2a65 | 150 | netif_dbg(lp, ifup, dev, "%s: Initialization done\n", __func__); |
1da177e4 LT |
151 | |
152 | return 0; | |
153 | } | |
154 | ||
3f4b7e6a | 155 | /* Wait for the SONIC to become idle. */ |
606dbf8d | 156 | static void sonic_quiesce(struct net_device *dev, u16 mask, bool may_sleep) |
3f4b7e6a FT |
157 | { |
158 | struct sonic_local * __maybe_unused lp = netdev_priv(dev); | |
159 | int i; | |
160 | u16 bits; | |
161 | ||
162 | for (i = 0; i < 1000; ++i) { | |
163 | bits = SONIC_READ(SONIC_CMD) & mask; | |
164 | if (!bits) | |
165 | return; | |
606dbf8d | 166 | if (!may_sleep) |
3f4b7e6a FT |
167 | udelay(20); |
168 | else | |
169 | usleep_range(100, 200); | |
170 | } | |
171 | WARN_ONCE(1, "command deadline expired! 0x%04x\n", bits); | |
172 | } | |
1da177e4 LT |
173 | |
174 | /* | |
175 | * Close the SONIC device | |
176 | */ | |
177 | static int sonic_close(struct net_device *dev) | |
178 | { | |
efcce839 FT |
179 | struct sonic_local *lp = netdev_priv(dev); |
180 | int i; | |
1da177e4 | 181 | |
995b2a65 | 182 | netif_dbg(lp, ifdown, dev, "%s\n", __func__); |
1da177e4 LT |
183 | |
184 | netif_stop_queue(dev); | |
185 | ||
186 | /* | |
187 | * stop the SONIC, disable interrupts | |
188 | */ | |
3f4b7e6a | 189 | SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS); |
606dbf8d | 190 | sonic_quiesce(dev, SONIC_CR_ALL, true); |
3f4b7e6a | 191 | |
1da177e4 | 192 | SONIC_WRITE(SONIC_IMR, 0); |
efcce839 | 193 | SONIC_WRITE(SONIC_ISR, 0x7fff); |
1da177e4 LT |
194 | SONIC_WRITE(SONIC_CMD, SONIC_CR_RST); |
195 | ||
efcce839 FT |
196 | /* unmap and free skbs that haven't been transmitted */ |
197 | for (i = 0; i < SONIC_NUM_TDS; i++) { | |
198 | if(lp->tx_laddr[i]) { | |
199 | dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE); | |
200 | lp->tx_laddr[i] = (dma_addr_t)0; | |
201 | } | |
202 | if(lp->tx_skb[i]) { | |
203 | dev_kfree_skb(lp->tx_skb[i]); | |
204 | lp->tx_skb[i] = NULL; | |
205 | } | |
206 | } | |
207 | ||
208 | /* unmap and free the receive buffers */ | |
209 | for (i = 0; i < SONIC_NUM_RRS; i++) { | |
210 | if(lp->rx_laddr[i]) { | |
211 | dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE); | |
212 | lp->rx_laddr[i] = (dma_addr_t)0; | |
213 | } | |
214 | if(lp->rx_skb[i]) { | |
215 | dev_kfree_skb(lp->rx_skb[i]); | |
216 | lp->rx_skb[i] = NULL; | |
217 | } | |
218 | } | |
219 | ||
1da177e4 LT |
220 | return 0; |
221 | } | |
222 | ||
0290bd29 | 223 | static void sonic_tx_timeout(struct net_device *dev, unsigned int txqueue) |
1da177e4 | 224 | { |
efcce839 FT |
225 | struct sonic_local *lp = netdev_priv(dev); |
226 | int i; | |
d74472f0 FT |
227 | /* |
228 | * put the Sonic into software-reset mode and | |
229 | * disable all interrupts before releasing DMA buffers | |
230 | */ | |
3f4b7e6a | 231 | SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS); |
606dbf8d | 232 | sonic_quiesce(dev, SONIC_CR_ALL, false); |
3f4b7e6a | 233 | |
efcce839 | 234 | SONIC_WRITE(SONIC_IMR, 0); |
d74472f0 FT |
235 | SONIC_WRITE(SONIC_ISR, 0x7fff); |
236 | SONIC_WRITE(SONIC_CMD, SONIC_CR_RST); | |
efcce839 FT |
237 | /* We could resend the original skbs. Easier to re-initialise. */ |
238 | for (i = 0; i < SONIC_NUM_TDS; i++) { | |
239 | if(lp->tx_laddr[i]) { | |
240 | dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE); | |
241 | lp->tx_laddr[i] = (dma_addr_t)0; | |
242 | } | |
243 | if(lp->tx_skb[i]) { | |
244 | dev_kfree_skb(lp->tx_skb[i]); | |
245 | lp->tx_skb[i] = NULL; | |
246 | } | |
247 | } | |
1da177e4 | 248 | /* Try to restart the adaptor. */ |
606dbf8d | 249 | sonic_init(dev, false); |
1da177e4 | 250 | lp->stats.tx_errors++; |
860e9538 | 251 | netif_trans_update(dev); /* prevent tx timeout */ |
1da177e4 LT |
252 | netif_wake_queue(dev); |
253 | } | |
254 | ||
255 | /* | |
256 | * transmit packet | |
efcce839 FT |
257 | * |
258 | * Appends new TD during transmission thus avoiding any TX interrupts | |
259 | * until we run out of TDs. | |
260 | * This routine interacts closely with the ISR in that it may, | |
261 | * set tx_skb[i] | |
262 | * reset the status flags of the new TD | |
263 | * set and reset EOL flags | |
264 | * stop the tx queue | |
265 | * The ISR interacts with this routine in various ways. It may, | |
266 | * reset tx_skb[i] | |
267 | * test the EOL and status flags of the TDs | |
268 | * wake the tx queue | |
269 | * Concurrently with all of this, the SONIC is potentially writing to | |
270 | * the status flags of the TDs. | |
1da177e4 | 271 | */ |
efcce839 | 272 | |
1da177e4 LT |
273 | static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev) |
274 | { | |
efcce839 FT |
275 | struct sonic_local *lp = netdev_priv(dev); |
276 | dma_addr_t laddr; | |
277 | int length; | |
865ad2f2 FT |
278 | int entry; |
279 | unsigned long flags; | |
1da177e4 | 280 | |
995b2a65 | 281 | netif_dbg(lp, tx_queued, dev, "%s: skb=%p\n", __func__, skb); |
1da177e4 | 282 | |
efcce839 FT |
283 | length = skb->len; |
284 | if (length < ETH_ZLEN) { | |
5b057c6b | 285 | if (skb_padto(skb, ETH_ZLEN)) |
ec634fe3 | 286 | return NETDEV_TX_OK; |
efcce839 FT |
287 | length = ETH_ZLEN; |
288 | } | |
289 | ||
1da177e4 LT |
290 | /* |
291 | * Map the packet data into the logical DMA address space | |
292 | */ | |
efcce839 FT |
293 | |
294 | laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE); | |
4107b874 | 295 | if (dma_mapping_error(lp->device, laddr)) { |
6e1cdedc | 296 | pr_err_ratelimited("%s: failed to map tx DMA buffer.\n", dev->name); |
49f6c90b | 297 | dev_kfree_skb_any(skb); |
6e1cdedc | 298 | return NETDEV_TX_OK; |
1da177e4 | 299 | } |
6aa20a22 | 300 | |
865ad2f2 FT |
301 | spin_lock_irqsave(&lp->lock, flags); |
302 | ||
29660d50 | 303 | entry = (lp->eol_tx + 1) & SONIC_TDS_MASK; |
865ad2f2 | 304 | |
efcce839 FT |
305 | sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0); /* clear status */ |
306 | sonic_tda_put(dev, entry, SONIC_TD_FRAG_COUNT, 1); /* single fragment */ | |
307 | sonic_tda_put(dev, entry, SONIC_TD_PKTSIZE, length); /* length of packet */ | |
308 | sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_L, laddr & 0xffff); | |
309 | sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_H, laddr >> 16); | |
310 | sonic_tda_put(dev, entry, SONIC_TD_FRAG_SIZE, length); | |
311 | sonic_tda_put(dev, entry, SONIC_TD_LINK, | |
312 | sonic_tda_get(dev, entry, SONIC_TD_LINK) | SONIC_EOL); | |
313 | ||
8fe676b3 FT |
314 | sonic_tda_put(dev, lp->eol_tx, SONIC_TD_LINK, ~SONIC_EOL & |
315 | sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK)); | |
316 | ||
317 | netif_dbg(lp, tx_queued, dev, "%s: issuing Tx command\n", __func__); | |
318 | ||
319 | SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP); | |
320 | ||
efcce839 | 321 | lp->tx_len[entry] = length; |
1da177e4 LT |
322 | lp->tx_laddr[entry] = laddr; |
323 | lp->tx_skb[entry] = skb; | |
324 | ||
efcce839 | 325 | lp->eol_tx = entry; |
1da177e4 | 326 | |
29660d50 FT |
327 | entry = (entry + 1) & SONIC_TDS_MASK; |
328 | if (lp->tx_skb[entry]) { | |
efcce839 | 329 | /* The ring is full, the ISR has yet to process the next TD. */ |
995b2a65 | 330 | netif_dbg(lp, tx_queued, dev, "%s: stopping queue\n", __func__); |
efcce839 FT |
331 | netif_stop_queue(dev); |
332 | /* after this packet, wait for ISR to free up some TDAs */ | |
d35bf9bc | 333 | } |
1da177e4 | 334 | |
865ad2f2 FT |
335 | spin_unlock_irqrestore(&lp->lock, flags); |
336 | ||
ec634fe3 | 337 | return NETDEV_TX_OK; |
1da177e4 LT |
338 | } |
339 | ||
340 | /* | |
341 | * The typical workload of the driver: | |
342 | * Handle the network interface interrupts. | |
343 | */ | |
7d12e780 | 344 | static irqreturn_t sonic_interrupt(int irq, void *dev_id) |
1da177e4 | 345 | { |
c31f28e7 | 346 | struct net_device *dev = dev_id; |
efcce839 | 347 | struct sonic_local *lp = netdev_priv(dev); |
1da177e4 | 348 | int status; |
865ad2f2 FT |
349 | unsigned long flags; |
350 | ||
351 | /* The lock has two purposes. Firstly, it synchronizes sonic_interrupt() | |
352 | * with sonic_send_packet() so that the two functions can share state. | |
353 | * Secondly, it makes sonic_interrupt() re-entrant, as that is required | |
354 | * by macsonic which must use two IRQs with different priority levels. | |
355 | */ | |
356 | spin_lock_irqsave(&lp->lock, flags); | |
357 | ||
358 | status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT; | |
359 | if (!status) { | |
360 | spin_unlock_irqrestore(&lp->lock, flags); | |
1da177e4 | 361 | |
efcce839 | 362 | return IRQ_NONE; |
865ad2f2 | 363 | } |
1da177e4 | 364 | |
efcce839 | 365 | do { |
5fedabf5 FT |
366 | SONIC_WRITE(SONIC_ISR, status); /* clear the interrupt(s) */ |
367 | ||
efcce839 | 368 | if (status & SONIC_INT_PKTRX) { |
995b2a65 | 369 | netif_dbg(lp, intr, dev, "%s: packet rx\n", __func__); |
efcce839 | 370 | sonic_rx(dev); /* got packet(s) */ |
efcce839 | 371 | } |
1da177e4 | 372 | |
efcce839 FT |
373 | if (status & SONIC_INT_TXDN) { |
374 | int entry = lp->cur_tx; | |
375 | int td_status; | |
376 | int freed_some = 0; | |
1da177e4 | 377 | |
865ad2f2 FT |
378 | /* The state of a Transmit Descriptor may be inferred |
379 | * from { tx_skb[entry], td_status } as follows. | |
380 | * { clear, clear } => the TD has never been used | |
381 | * { set, clear } => the TD was handed to SONIC | |
382 | * { set, set } => the TD was handed back | |
383 | * { clear, set } => the TD is available for re-use | |
efcce839 | 384 | */ |
1da177e4 | 385 | |
995b2a65 | 386 | netif_dbg(lp, intr, dev, "%s: tx done\n", __func__); |
efcce839 FT |
387 | |
388 | while (lp->tx_skb[entry] != NULL) { | |
389 | if ((td_status = sonic_tda_get(dev, entry, SONIC_TD_STATUS)) == 0) | |
390 | break; | |
391 | ||
427db97d | 392 | if (td_status & SONIC_TCR_PTX) { |
efcce839 FT |
393 | lp->stats.tx_packets++; |
394 | lp->stats.tx_bytes += sonic_tda_get(dev, entry, SONIC_TD_PKTSIZE); | |
395 | } else { | |
427db97d FT |
396 | if (td_status & (SONIC_TCR_EXD | |
397 | SONIC_TCR_EXC | SONIC_TCR_BCM)) | |
efcce839 | 398 | lp->stats.tx_aborted_errors++; |
427db97d FT |
399 | if (td_status & |
400 | (SONIC_TCR_NCRS | SONIC_TCR_CRLS)) | |
efcce839 | 401 | lp->stats.tx_carrier_errors++; |
427db97d | 402 | if (td_status & SONIC_TCR_OWC) |
efcce839 | 403 | lp->stats.tx_window_errors++; |
427db97d | 404 | if (td_status & SONIC_TCR_FU) |
efcce839 FT |
405 | lp->stats.tx_fifo_errors++; |
406 | } | |
407 | ||
408 | /* We must free the original skb */ | |
380ab7e3 | 409 | dev_consume_skb_irq(lp->tx_skb[entry]); |
efcce839 FT |
410 | lp->tx_skb[entry] = NULL; |
411 | /* and unmap DMA buffer */ | |
412 | dma_unmap_single(lp->device, lp->tx_laddr[entry], lp->tx_len[entry], DMA_TO_DEVICE); | |
413 | lp->tx_laddr[entry] = (dma_addr_t)0; | |
414 | freed_some = 1; | |
415 | ||
416 | if (sonic_tda_get(dev, entry, SONIC_TD_LINK) & SONIC_EOL) { | |
417 | entry = (entry + 1) & SONIC_TDS_MASK; | |
418 | break; | |
419 | } | |
420 | entry = (entry + 1) & SONIC_TDS_MASK; | |
1da177e4 | 421 | } |
1da177e4 | 422 | |
efcce839 FT |
423 | if (freed_some || lp->tx_skb[entry] == NULL) |
424 | netif_wake_queue(dev); /* The ring is no longer full */ | |
425 | lp->cur_tx = entry; | |
1da177e4 LT |
426 | } |
427 | ||
efcce839 FT |
428 | /* |
429 | * check error conditions | |
430 | */ | |
431 | if (status & SONIC_INT_RFO) { | |
995b2a65 FT |
432 | netif_dbg(lp, rx_err, dev, "%s: rx fifo overrun\n", |
433 | __func__); | |
efcce839 FT |
434 | } |
435 | if (status & SONIC_INT_RDE) { | |
995b2a65 FT |
436 | netif_dbg(lp, rx_err, dev, "%s: rx descriptors exhausted\n", |
437 | __func__); | |
efcce839 FT |
438 | } |
439 | if (status & SONIC_INT_RBAE) { | |
995b2a65 FT |
440 | netif_dbg(lp, rx_err, dev, "%s: rx buffer area exceeded\n", |
441 | __func__); | |
efcce839 | 442 | } |
1da177e4 | 443 | |
efcce839 | 444 | /* counter overruns; all counters are 16bit wide */ |
5fedabf5 | 445 | if (status & SONIC_INT_FAE) |
efcce839 | 446 | lp->stats.rx_frame_errors += 65536; |
5fedabf5 | 447 | if (status & SONIC_INT_CRC) |
efcce839 | 448 | lp->stats.rx_crc_errors += 65536; |
5fedabf5 | 449 | if (status & SONIC_INT_MP) |
efcce839 | 450 | lp->stats.rx_missed_errors += 65536; |
1da177e4 | 451 | |
efcce839 FT |
452 | /* transmit error */ |
453 | if (status & SONIC_INT_TXER) { | |
686f85d7 FT |
454 | u16 tcr = SONIC_READ(SONIC_TCR); |
455 | ||
456 | netif_dbg(lp, tx_err, dev, "%s: TXER intr, TCR %04x\n", | |
457 | __func__, tcr); | |
458 | ||
459 | if (tcr & (SONIC_TCR_EXD | SONIC_TCR_EXC | | |
460 | SONIC_TCR_FU | SONIC_TCR_BCM)) { | |
461 | /* Aborted transmission. Try again. */ | |
462 | netif_stop_queue(dev); | |
463 | SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP); | |
464 | } | |
efcce839 | 465 | } |
1da177e4 | 466 | |
efcce839 FT |
467 | /* bus retry */ |
468 | if (status & SONIC_INT_BR) { | |
469 | printk(KERN_ERR "%s: Bus retry occurred! Device interrupt disabled.\n", | |
470 | dev->name); | |
471 | /* ... to help debug DMA problems causing endless interrupts. */ | |
472 | /* Bounce the eth interface to turn on the interrupt again. */ | |
473 | SONIC_WRITE(SONIC_IMR, 0); | |
efcce839 | 474 | } |
1da177e4 | 475 | |
865ad2f2 FT |
476 | status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT; |
477 | } while (status); | |
478 | ||
479 | spin_unlock_irqrestore(&lp->lock, flags); | |
480 | ||
1da177e4 LT |
481 | return IRQ_HANDLED; |
482 | } | |
483 | ||
9e311820 FT |
484 | /* Return the array index corresponding to a given Receive Buffer pointer. */ |
485 | static int index_from_addr(struct sonic_local *lp, dma_addr_t addr, | |
486 | unsigned int last) | |
487 | { | |
488 | unsigned int i = last; | |
489 | ||
490 | do { | |
491 | i = (i + 1) & SONIC_RRS_MASK; | |
492 | if (addr == lp->rx_laddr[i]) | |
493 | return i; | |
494 | } while (i != last); | |
495 | ||
496 | return -ENOENT; | |
497 | } | |
498 | ||
89ba879e FT |
499 | /* Allocate and map a new skb to be used as a receive buffer. */ |
500 | static bool sonic_alloc_rb(struct net_device *dev, struct sonic_local *lp, | |
501 | struct sk_buff **new_skb, dma_addr_t *new_addr) | |
502 | { | |
503 | *new_skb = netdev_alloc_skb(dev, SONIC_RBSIZE + 2); | |
504 | if (!*new_skb) | |
505 | return false; | |
506 | ||
507 | if (SONIC_BUS_SCALE(lp->dma_bitmode) == 2) | |
508 | skb_reserve(*new_skb, 2); | |
509 | ||
510 | *new_addr = dma_map_single(lp->device, skb_put(*new_skb, SONIC_RBSIZE), | |
511 | SONIC_RBSIZE, DMA_FROM_DEVICE); | |
4107b874 | 512 | if (dma_mapping_error(lp->device, *new_addr)) { |
89ba879e FT |
513 | dev_kfree_skb(*new_skb); |
514 | *new_skb = NULL; | |
515 | return false; | |
516 | } | |
517 | ||
518 | return true; | |
519 | } | |
520 | ||
521 | /* Place a new receive resource in the Receive Resource Area and update RWP. */ | |
522 | static void sonic_update_rra(struct net_device *dev, struct sonic_local *lp, | |
523 | dma_addr_t old_addr, dma_addr_t new_addr) | |
524 | { | |
525 | unsigned int entry = sonic_rr_entry(dev, SONIC_READ(SONIC_RWP)); | |
526 | unsigned int end = sonic_rr_entry(dev, SONIC_READ(SONIC_RRP)); | |
527 | u32 buf; | |
528 | ||
529 | /* The resources in the range [RRP, RWP) belong to the SONIC. This loop | |
530 | * scans the other resources in the RRA, those in the range [RWP, RRP). | |
531 | */ | |
532 | do { | |
533 | buf = (sonic_rra_get(dev, entry, SONIC_RR_BUFADR_H) << 16) | | |
534 | sonic_rra_get(dev, entry, SONIC_RR_BUFADR_L); | |
535 | ||
536 | if (buf == old_addr) | |
537 | break; | |
538 | ||
539 | entry = (entry + 1) & SONIC_RRS_MASK; | |
540 | } while (entry != end); | |
541 | ||
542 | WARN_ONCE(buf != old_addr, "failed to find resource!\n"); | |
543 | ||
544 | sonic_rra_put(dev, entry, SONIC_RR_BUFADR_H, new_addr >> 16); | |
545 | sonic_rra_put(dev, entry, SONIC_RR_BUFADR_L, new_addr & 0xffff); | |
546 | ||
547 | entry = (entry + 1) & SONIC_RRS_MASK; | |
548 | ||
549 | SONIC_WRITE(SONIC_RWP, sonic_rr_addr(dev, entry)); | |
550 | } | |
551 | ||
1da177e4 | 552 | /* |
efcce839 | 553 | * We have a good packet(s), pass it/them up the network stack. |
1da177e4 LT |
554 | */ |
555 | static void sonic_rx(struct net_device *dev) | |
556 | { | |
efcce839 | 557 | struct sonic_local *lp = netdev_priv(dev); |
efcce839 | 558 | int entry = lp->cur_rx; |
eaabfd19 | 559 | int prev_entry = lp->eol_rx; |
89ba879e | 560 | bool rbe = false; |
efcce839 FT |
561 | |
562 | while (sonic_rda_get(dev, entry, SONIC_RD_IN_USE) == 0) { | |
94b16634 | 563 | u16 status = sonic_rda_get(dev, entry, SONIC_RD_STATUS); |
1da177e4 | 564 | |
94b16634 FT |
565 | /* If the RD has LPKT set, the chip has finished with the RB */ |
566 | if ((status & SONIC_RCR_PRX) && (status & SONIC_RCR_LPKT)) { | |
89ba879e FT |
567 | struct sk_buff *new_skb; |
568 | dma_addr_t new_laddr; | |
9e311820 FT |
569 | u32 addr = (sonic_rda_get(dev, entry, |
570 | SONIC_RD_PKTPTR_H) << 16) | | |
571 | sonic_rda_get(dev, entry, SONIC_RD_PKTPTR_L); | |
572 | int i = index_from_addr(lp, addr, entry); | |
573 | ||
574 | if (i < 0) { | |
575 | WARN_ONCE(1, "failed to find buffer!\n"); | |
efcce839 FT |
576 | break; |
577 | } | |
9e311820 | 578 | |
89ba879e FT |
579 | if (sonic_alloc_rb(dev, lp, &new_skb, &new_laddr)) { |
580 | struct sk_buff *used_skb = lp->rx_skb[i]; | |
581 | int pkt_len; | |
582 | ||
583 | /* Pass the used buffer up the stack */ | |
584 | dma_unmap_single(lp->device, addr, SONIC_RBSIZE, | |
585 | DMA_FROM_DEVICE); | |
586 | ||
587 | pkt_len = sonic_rda_get(dev, entry, | |
588 | SONIC_RD_PKTLEN); | |
589 | skb_trim(used_skb, pkt_len); | |
590 | used_skb->protocol = eth_type_trans(used_skb, | |
591 | dev); | |
592 | netif_rx(used_skb); | |
593 | lp->stats.rx_packets++; | |
594 | lp->stats.rx_bytes += pkt_len; | |
595 | ||
596 | lp->rx_skb[i] = new_skb; | |
597 | lp->rx_laddr[i] = new_laddr; | |
598 | } else { | |
599 | /* Failed to obtain a new buffer so re-use it */ | |
600 | new_laddr = addr; | |
1da177e4 | 601 | lp->stats.rx_dropped++; |
1da177e4 | 602 | } |
89ba879e FT |
603 | /* If RBE is already asserted when RWP advances then |
604 | * it's safe to clear RBE after processing this packet. | |
1da177e4 | 605 | */ |
89ba879e FT |
606 | rbe = rbe || SONIC_READ(SONIC_ISR) & SONIC_INT_RBE; |
607 | sonic_update_rra(dev, lp, addr, new_laddr); | |
94b16634 | 608 | } |
efcce839 FT |
609 | /* |
610 | * give back the descriptor | |
611 | */ | |
94b16634 | 612 | sonic_rda_put(dev, entry, SONIC_RD_STATUS, 0); |
efcce839 | 613 | sonic_rda_put(dev, entry, SONIC_RD_IN_USE, 1); |
eaabfd19 FT |
614 | |
615 | prev_entry = entry; | |
616 | entry = (entry + 1) & SONIC_RDS_MASK; | |
617 | } | |
618 | ||
619 | lp->cur_rx = entry; | |
620 | ||
621 | if (prev_entry != lp->eol_rx) { | |
622 | /* Advance the EOL flag to put descriptors back into service */ | |
623 | sonic_rda_put(dev, prev_entry, SONIC_RD_LINK, SONIC_EOL | | |
624 | sonic_rda_get(dev, prev_entry, SONIC_RD_LINK)); | |
625 | sonic_rda_put(dev, lp->eol_rx, SONIC_RD_LINK, ~SONIC_EOL & | |
626 | sonic_rda_get(dev, lp->eol_rx, SONIC_RD_LINK)); | |
627 | lp->eol_rx = prev_entry; | |
1da177e4 | 628 | } |
89ba879e FT |
629 | |
630 | if (rbe) | |
631 | SONIC_WRITE(SONIC_ISR, SONIC_INT_RBE); | |
1da177e4 LT |
632 | } |
633 | ||
634 | ||
635 | /* | |
636 | * Get the current statistics. | |
637 | * This may be called with the device open or closed. | |
638 | */ | |
639 | static struct net_device_stats *sonic_get_stats(struct net_device *dev) | |
640 | { | |
efcce839 | 641 | struct sonic_local *lp = netdev_priv(dev); |
1da177e4 LT |
642 | |
643 | /* read the tally counter from the SONIC and reset them */ | |
644 | lp->stats.rx_crc_errors += SONIC_READ(SONIC_CRCT); | |
645 | SONIC_WRITE(SONIC_CRCT, 0xffff); | |
646 | lp->stats.rx_frame_errors += SONIC_READ(SONIC_FAET); | |
647 | SONIC_WRITE(SONIC_FAET, 0xffff); | |
648 | lp->stats.rx_missed_errors += SONIC_READ(SONIC_MPT); | |
649 | SONIC_WRITE(SONIC_MPT, 0xffff); | |
650 | ||
651 | return &lp->stats; | |
652 | } | |
653 | ||
654 | ||
655 | /* | |
656 | * Set or clear the multicast filter for this adaptor. | |
657 | */ | |
658 | static void sonic_multicast_list(struct net_device *dev) | |
659 | { | |
efcce839 | 660 | struct sonic_local *lp = netdev_priv(dev); |
1da177e4 | 661 | unsigned int rcr; |
22bedad3 | 662 | struct netdev_hw_addr *ha; |
1da177e4 LT |
663 | unsigned char *addr; |
664 | int i; | |
665 | ||
666 | rcr = SONIC_READ(SONIC_RCR) & ~(SONIC_RCR_PRO | SONIC_RCR_AMC); | |
667 | rcr |= SONIC_RCR_BRD; /* accept broadcast packets */ | |
668 | ||
669 | if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */ | |
670 | rcr |= SONIC_RCR_PRO; | |
671 | } else { | |
4cd24eaf JP |
672 | if ((dev->flags & IFF_ALLMULTI) || |
673 | (netdev_mc_count(dev) > 15)) { | |
1da177e4 LT |
674 | rcr |= SONIC_RCR_AMC; |
675 | } else { | |
772f6642 FT |
676 | unsigned long flags; |
677 | ||
995b2a65 FT |
678 | netif_dbg(lp, ifup, dev, "%s: mc_count %d\n", __func__, |
679 | netdev_mc_count(dev)); | |
efcce839 | 680 | sonic_set_cam_enable(dev, 1); /* always enable our own address */ |
5508590c | 681 | i = 1; |
22bedad3 JP |
682 | netdev_for_each_mc_addr(ha, dev) { |
683 | addr = ha->addr; | |
efcce839 FT |
684 | sonic_cda_put(dev, i, SONIC_CD_CAP0, addr[1] << 8 | addr[0]); |
685 | sonic_cda_put(dev, i, SONIC_CD_CAP1, addr[3] << 8 | addr[2]); | |
686 | sonic_cda_put(dev, i, SONIC_CD_CAP2, addr[5] << 8 | addr[4]); | |
687 | sonic_set_cam_enable(dev, sonic_get_cam_enable(dev) | (1 << i)); | |
5508590c | 688 | i++; |
1da177e4 LT |
689 | } |
690 | SONIC_WRITE(SONIC_CDC, 16); | |
1da177e4 | 691 | SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff); |
772f6642 FT |
692 | |
693 | /* LCAM and TXP commands can't be used simultaneously */ | |
694 | spin_lock_irqsave(&lp->lock, flags); | |
606dbf8d | 695 | sonic_quiesce(dev, SONIC_CR_TXP, false); |
1da177e4 | 696 | SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM); |
606dbf8d | 697 | sonic_quiesce(dev, SONIC_CR_LCAM, false); |
772f6642 | 698 | spin_unlock_irqrestore(&lp->lock, flags); |
1da177e4 LT |
699 | } |
700 | } | |
701 | ||
995b2a65 | 702 | netif_dbg(lp, ifup, dev, "%s: setting RCR=%x\n", __func__, rcr); |
1da177e4 LT |
703 | |
704 | SONIC_WRITE(SONIC_RCR, rcr); | |
705 | } | |
706 | ||
707 | ||
708 | /* | |
709 | * Initialize the SONIC ethernet controller. | |
710 | */ | |
606dbf8d | 711 | static int sonic_init(struct net_device *dev, bool may_sleep) |
1da177e4 | 712 | { |
efcce839 | 713 | struct sonic_local *lp = netdev_priv(dev); |
1da177e4 LT |
714 | int i; |
715 | ||
716 | /* | |
717 | * put the Sonic into software-reset mode and | |
718 | * disable all interrupts | |
719 | */ | |
1da177e4 | 720 | SONIC_WRITE(SONIC_IMR, 0); |
efcce839 | 721 | SONIC_WRITE(SONIC_ISR, 0x7fff); |
1da177e4 LT |
722 | SONIC_WRITE(SONIC_CMD, SONIC_CR_RST); |
723 | ||
772f6642 FT |
724 | /* While in reset mode, clear CAM Enable register */ |
725 | SONIC_WRITE(SONIC_CE, 0); | |
726 | ||
1da177e4 LT |
727 | /* |
728 | * clear software reset flag, disable receiver, clear and | |
729 | * enable interrupts, then completely initialize the SONIC | |
730 | */ | |
731 | SONIC_WRITE(SONIC_CMD, 0); | |
27e0c31c | 732 | SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS | SONIC_CR_STP); |
606dbf8d | 733 | sonic_quiesce(dev, SONIC_CR_ALL, may_sleep); |
1da177e4 LT |
734 | |
735 | /* | |
736 | * initialize the receive resource area | |
737 | */ | |
995b2a65 FT |
738 | netif_dbg(lp, ifup, dev, "%s: initialize receive resource area\n", |
739 | __func__); | |
1da177e4 | 740 | |
1da177e4 | 741 | for (i = 0; i < SONIC_NUM_RRS; i++) { |
efcce839 FT |
742 | u16 bufadr_l = (unsigned long)lp->rx_laddr[i] & 0xffff; |
743 | u16 bufadr_h = (unsigned long)lp->rx_laddr[i] >> 16; | |
744 | sonic_rra_put(dev, i, SONIC_RR_BUFADR_L, bufadr_l); | |
745 | sonic_rra_put(dev, i, SONIC_RR_BUFADR_H, bufadr_h); | |
746 | sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_L, SONIC_RBSIZE >> 1); | |
747 | sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_H, 0); | |
1da177e4 LT |
748 | } |
749 | ||
750 | /* initialize all RRA registers */ | |
89ba879e FT |
751 | SONIC_WRITE(SONIC_RSA, sonic_rr_addr(dev, 0)); |
752 | SONIC_WRITE(SONIC_REA, sonic_rr_addr(dev, SONIC_NUM_RRS)); | |
753 | SONIC_WRITE(SONIC_RRP, sonic_rr_addr(dev, 0)); | |
754 | SONIC_WRITE(SONIC_RWP, sonic_rr_addr(dev, SONIC_NUM_RRS - 1)); | |
1da177e4 | 755 | SONIC_WRITE(SONIC_URRA, lp->rra_laddr >> 16); |
efcce839 | 756 | SONIC_WRITE(SONIC_EOBC, (SONIC_RBSIZE >> 1) - (lp->dma_bitmode ? 2 : 1)); |
1da177e4 LT |
757 | |
758 | /* load the resource pointers */ | |
995b2a65 | 759 | netif_dbg(lp, ifup, dev, "%s: issuing RRRA command\n", __func__); |
6aa20a22 | 760 | |
1da177e4 | 761 | SONIC_WRITE(SONIC_CMD, SONIC_CR_RRRA); |
606dbf8d | 762 | sonic_quiesce(dev, SONIC_CR_RRRA, may_sleep); |
6aa20a22 | 763 | |
1da177e4 LT |
764 | /* |
765 | * Initialize the receive descriptors so that they | |
766 | * become a circular linked list, ie. let the last | |
767 | * descriptor point to the first again. | |
768 | */ | |
995b2a65 FT |
769 | netif_dbg(lp, ifup, dev, "%s: initialize receive descriptors\n", |
770 | __func__); | |
771 | ||
efcce839 FT |
772 | for (i=0; i<SONIC_NUM_RDS; i++) { |
773 | sonic_rda_put(dev, i, SONIC_RD_STATUS, 0); | |
774 | sonic_rda_put(dev, i, SONIC_RD_PKTLEN, 0); | |
775 | sonic_rda_put(dev, i, SONIC_RD_PKTPTR_L, 0); | |
776 | sonic_rda_put(dev, i, SONIC_RD_PKTPTR_H, 0); | |
777 | sonic_rda_put(dev, i, SONIC_RD_SEQNO, 0); | |
778 | sonic_rda_put(dev, i, SONIC_RD_IN_USE, 1); | |
779 | sonic_rda_put(dev, i, SONIC_RD_LINK, | |
780 | lp->rda_laddr + | |
781 | ((i+1) * SIZEOF_SONIC_RD * SONIC_BUS_SCALE(lp->dma_bitmode))); | |
1da177e4 LT |
782 | } |
783 | /* fix last descriptor */ | |
efcce839 FT |
784 | sonic_rda_put(dev, SONIC_NUM_RDS - 1, SONIC_RD_LINK, |
785 | (lp->rda_laddr & 0xffff) | SONIC_EOL); | |
786 | lp->eol_rx = SONIC_NUM_RDS - 1; | |
1da177e4 LT |
787 | lp->cur_rx = 0; |
788 | SONIC_WRITE(SONIC_URDA, lp->rda_laddr >> 16); | |
789 | SONIC_WRITE(SONIC_CRDA, lp->rda_laddr & 0xffff); | |
790 | ||
6aa20a22 | 791 | /* |
1da177e4 LT |
792 | * initialize transmit descriptors |
793 | */ | |
995b2a65 FT |
794 | netif_dbg(lp, ifup, dev, "%s: initialize transmit descriptors\n", |
795 | __func__); | |
796 | ||
1da177e4 | 797 | for (i = 0; i < SONIC_NUM_TDS; i++) { |
efcce839 FT |
798 | sonic_tda_put(dev, i, SONIC_TD_STATUS, 0); |
799 | sonic_tda_put(dev, i, SONIC_TD_CONFIG, 0); | |
800 | sonic_tda_put(dev, i, SONIC_TD_PKTSIZE, 0); | |
801 | sonic_tda_put(dev, i, SONIC_TD_FRAG_COUNT, 0); | |
802 | sonic_tda_put(dev, i, SONIC_TD_LINK, | |
803 | (lp->tda_laddr & 0xffff) + | |
804 | (i + 1) * SIZEOF_SONIC_TD * SONIC_BUS_SCALE(lp->dma_bitmode)); | |
805 | lp->tx_skb[i] = NULL; | |
1da177e4 | 806 | } |
efcce839 FT |
807 | /* fix last descriptor */ |
808 | sonic_tda_put(dev, SONIC_NUM_TDS - 1, SONIC_TD_LINK, | |
809 | (lp->tda_laddr & 0xffff)); | |
1da177e4 LT |
810 | |
811 | SONIC_WRITE(SONIC_UTDA, lp->tda_laddr >> 16); | |
812 | SONIC_WRITE(SONIC_CTDA, lp->tda_laddr & 0xffff); | |
29660d50 | 813 | lp->cur_tx = 0; |
efcce839 | 814 | lp->eol_tx = SONIC_NUM_TDS - 1; |
6aa20a22 | 815 | |
1da177e4 LT |
816 | /* |
817 | * put our own address to CAM desc[0] | |
818 | */ | |
efcce839 FT |
819 | sonic_cda_put(dev, 0, SONIC_CD_CAP0, dev->dev_addr[1] << 8 | dev->dev_addr[0]); |
820 | sonic_cda_put(dev, 0, SONIC_CD_CAP1, dev->dev_addr[3] << 8 | dev->dev_addr[2]); | |
821 | sonic_cda_put(dev, 0, SONIC_CD_CAP2, dev->dev_addr[5] << 8 | dev->dev_addr[4]); | |
822 | sonic_set_cam_enable(dev, 1); | |
1da177e4 LT |
823 | |
824 | for (i = 0; i < 16; i++) | |
efcce839 | 825 | sonic_cda_put(dev, i, SONIC_CD_ENTRY_POINTER, i); |
1da177e4 LT |
826 | |
827 | /* | |
828 | * initialize CAM registers | |
829 | */ | |
830 | SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff); | |
831 | SONIC_WRITE(SONIC_CDC, 16); | |
832 | ||
833 | /* | |
834 | * load the CAM | |
835 | */ | |
836 | SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM); | |
606dbf8d | 837 | sonic_quiesce(dev, SONIC_CR_LCAM, may_sleep); |
1da177e4 LT |
838 | |
839 | /* | |
840 | * enable receiver, disable loopback | |
841 | * and enable all interrupts | |
842 | */ | |
1da177e4 LT |
843 | SONIC_WRITE(SONIC_RCR, SONIC_RCR_DEFAULT); |
844 | SONIC_WRITE(SONIC_TCR, SONIC_TCR_DEFAULT); | |
845 | SONIC_WRITE(SONIC_ISR, 0x7fff); | |
846 | SONIC_WRITE(SONIC_IMR, SONIC_IMR_DEFAULT); | |
27e0c31c | 847 | SONIC_WRITE(SONIC_CMD, SONIC_CR_RXEN); |
1da177e4 | 848 | |
995b2a65 FT |
849 | netif_dbg(lp, ifup, dev, "%s: new status=%x\n", __func__, |
850 | SONIC_READ(SONIC_CMD)); | |
1da177e4 LT |
851 | |
852 | return 0; | |
853 | } | |
854 | ||
855 | MODULE_LICENSE("GPL"); |