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1da177e4 LT |
1 | /* |
2 | drivers/net/tulip/pnic2.c | |
3 | ||
1da177e4 LT |
4 | Copyright 2000,2001 The Linux Kernel Team |
5 | Written/copyright 1994-2001 by Donald Becker. | |
6 | Modified to hep support PNIC_II by Kevin B. Hendricks | |
7 | ||
8 | This software may be used and distributed according to the terms | |
9 | of the GNU General Public License, incorporated herein by reference. | |
10 | ||
78a65518 | 11 | Please submit bugs to http://bugzilla.kernel.org/ . |
1da177e4 LT |
12 | */ |
13 | ||
14 | ||
15 | /* Understanding the PNIC_II - everything is this file is based | |
16 | * on the PNIC_II_PDF datasheet which is sorely lacking in detail | |
17 | * | |
18 | * As I understand things, here are the registers and bits that | |
19 | * explain the masks and constants used in this file that are | |
20 | * either different from the 21142/3 or important for basic operation. | |
21 | * | |
22 | * | |
23 | * CSR 6 (mask = 0xfe3bd1fd of bits not to change) | |
24 | * ----- | |
25 | * Bit 24 - SCR | |
26 | * Bit 23 - PCS | |
27 | * Bit 22 - TTM (Trasmit Threshold Mode) | |
28 | * Bit 18 - Port Select | |
29 | * Bit 13 - Start - 1, Stop - 0 Transmissions | |
30 | * Bit 11:10 - Loop Back Operation Mode | |
31 | * Bit 9 - Full Duplex mode (Advertise 10BaseT-FD is CSR14<7> is set) | |
32 | * Bit 1 - Start - 1, Stop - 0 Receive | |
33 | * | |
34 | * | |
35 | * CSR 14 (mask = 0xfff0ee39 of bits not to change) | |
36 | * ------ | |
37 | * Bit 19 - PAUSE-Pause | |
38 | * Bit 18 - Advertise T4 | |
39 | * Bit 17 - Advertise 100baseTx-FD | |
40 | * Bit 16 - Advertise 100baseTx-HD | |
41 | * Bit 12 - LTE - Link Test Enable | |
42 | * Bit 7 - ANE - Auto Negotiate Enable | |
43 | * Bit 6 - HDE - Advertise 10baseT-HD | |
44 | * Bit 2 - Reset to Power down - kept as 1 for normal operation | |
45 | * Bit 1 - Loop Back enable for 10baseT MCC | |
46 | * | |
47 | * | |
48 | * CSR 12 | |
49 | * ------ | |
50 | * Bit 25 - Partner can do T4 | |
51 | * Bit 24 - Partner can do 100baseTx-FD | |
52 | * Bit 23 - Partner can do 100baseTx-HD | |
53 | * Bit 22 - Partner can do 10baseT-FD | |
54 | * Bit 21 - Partner can do 10baseT-HD | |
55 | * Bit 15 - LPN is 1 if all above bits are valid other wise 0 | |
56 | * Bit 14:12 - autonegotiation state (write 001 to start autonegotiate) | |
57 | * Bit 3 - Autopolarity state | |
58 | * Bit 2 - LS10B - link state of 10baseT 0 - good, 1 - failed | |
426d3107 | 59 | * Bit 1 - LS100B - link state of 100baseT 0 - good, 1 - failed |
1da177e4 LT |
60 | * |
61 | * | |
62 | * Data Port Selection Info | |
63 | *------------------------- | |
64 | * | |
65 | * CSR14<7> CSR6<18> CSR6<22> CSR6<23> CSR6<24> MODE/PORT | |
66 | * 1 0 0 (X) 0 (X) 1 NWAY | |
67 | * 0 0 1 0 (X) 0 10baseT | |
68 | * 0 1 0 1 1 (X) 100baseT | |
69 | * | |
70 | * | |
71 | */ | |
72 | ||
73 | ||
74 | ||
1da177e4 LT |
75 | #include "tulip.h" |
76 | #include <linux/delay.h> | |
77 | ||
78 | ||
79 | void pnic2_timer(unsigned long data) | |
80 | { | |
81 | struct net_device *dev = (struct net_device *)data; | |
82 | struct tulip_private *tp = netdev_priv(dev); | |
83 | void __iomem *ioaddr = tp->base_addr; | |
84 | int next_tick = 60*HZ; | |
85 | ||
86 | if (tulip_debug > 3) | |
22086a11 JP |
87 | dev_info(&dev->dev, "PNIC2 negotiation status %08x\n", |
88 | ioread32(ioaddr + CSR12)); | |
1da177e4 LT |
89 | |
90 | if (next_tick) { | |
91 | mod_timer(&tp->timer, RUN_AT(next_tick)); | |
92 | } | |
93 | } | |
94 | ||
95 | ||
96 | void pnic2_start_nway(struct net_device *dev) | |
97 | { | |
98 | struct tulip_private *tp = netdev_priv(dev); | |
99 | void __iomem *ioaddr = tp->base_addr; | |
100 | int csr14; | |
101 | int csr12; | |
102 | ||
103 | /* set up what to advertise during the negotiation */ | |
104 | ||
105 | /* load in csr14 and mask off bits not to touch | |
106 | * comment at top of file explains mask value | |
107 | */ | |
108 | csr14 = (ioread32(ioaddr + CSR14) & 0xfff0ee39); | |
109 | ||
110 | /* bit 17 - advetise 100baseTx-FD */ | |
111 | if (tp->sym_advertise & 0x0100) csr14 |= 0x00020000; | |
112 | ||
113 | /* bit 16 - advertise 100baseTx-HD */ | |
114 | if (tp->sym_advertise & 0x0080) csr14 |= 0x00010000; | |
115 | ||
116 | /* bit 6 - advertise 10baseT-HD */ | |
117 | if (tp->sym_advertise & 0x0020) csr14 |= 0x00000040; | |
118 | ||
119 | /* Now set bit 12 Link Test Enable, Bit 7 Autonegotiation Enable | |
120 | * and bit 0 Don't PowerDown 10baseT | |
121 | */ | |
122 | csr14 |= 0x00001184; | |
123 | ||
124 | if (tulip_debug > 1) | |
726b65ad JP |
125 | netdev_dbg(dev, "Restarting PNIC2 autonegotiation, csr14=%08x\n", |
126 | csr14); | |
1da177e4 LT |
127 | |
128 | /* tell pnic2_lnk_change we are doing an nway negotiation */ | |
129 | dev->if_port = 0; | |
130 | tp->nway = tp->mediasense = 1; | |
131 | tp->nwayset = tp->lpar = 0; | |
132 | ||
133 | /* now we have to set up csr6 for NWAY state */ | |
134 | ||
135 | tp->csr6 = ioread32(ioaddr + CSR6); | |
136 | if (tulip_debug > 1) | |
726b65ad | 137 | netdev_dbg(dev, "On Entry to Nway, csr6=%08x\n", tp->csr6); |
1da177e4 LT |
138 | |
139 | /* mask off any bits not to touch | |
140 | * comment at top of file explains mask value | |
141 | */ | |
142 | tp->csr6 = tp->csr6 & 0xfe3bd1fd; | |
143 | ||
144 | /* don't forget that bit 9 is also used for advertising */ | |
145 | /* advertise 10baseT-FD for the negotiation (bit 9) */ | |
146 | if (tp->sym_advertise & 0x0040) tp->csr6 |= 0x00000200; | |
147 | ||
148 | /* set bit 24 for nway negotiation mode ... | |
149 | * see Data Port Selection comment at top of file | |
150 | * and "Stop" - reset both Transmit (bit 13) and Receive (bit 1) | |
151 | */ | |
152 | tp->csr6 |= 0x01000000; | |
153 | iowrite32(csr14, ioaddr + CSR14); | |
154 | iowrite32(tp->csr6, ioaddr + CSR6); | |
155 | udelay(100); | |
156 | ||
157 | /* all set up so now force the negotiation to begin */ | |
158 | ||
159 | /* read in current values and mask off all but the | |
160 | * Autonegotiation bits 14:12. Writing a 001 to those bits | |
161 | * should start the autonegotiation | |
162 | */ | |
163 | csr12 = (ioread32(ioaddr + CSR12) & 0xffff8fff); | |
164 | csr12 |= 0x1000; | |
165 | iowrite32(csr12, ioaddr + CSR12); | |
166 | } | |
167 | ||
168 | ||
169 | ||
170 | void pnic2_lnk_change(struct net_device *dev, int csr5) | |
171 | { | |
172 | struct tulip_private *tp = netdev_priv(dev); | |
173 | void __iomem *ioaddr = tp->base_addr; | |
174 | int csr14; | |
175 | ||
176 | /* read the staus register to find out what is up */ | |
177 | int csr12 = ioread32(ioaddr + CSR12); | |
178 | ||
179 | if (tulip_debug > 1) | |
22086a11 JP |
180 | dev_info(&dev->dev, |
181 | "PNIC2 link status interrupt %08x, CSR5 %x, %08x\n", | |
182 | csr12, csr5, ioread32(ioaddr + CSR14)); | |
1da177e4 LT |
183 | |
184 | /* If NWay finished and we have a negotiated partner capability. | |
185 | * check bits 14:12 for bit pattern 101 - all is good | |
186 | */ | |
187 | if (tp->nway && !tp->nwayset) { | |
188 | ||
189 | /* we did an auto negotiation */ | |
190 | ||
191 | if ((csr12 & 0x7000) == 0x5000) { | |
192 | ||
193 | /* negotiation ended successfully */ | |
194 | ||
195 | /* get the link partners reply and mask out all but | |
7f927fcc | 196 | * bits 24-21 which show the partners capabilities |
1da177e4 LT |
197 | * and match those to what we advertised |
198 | * | |
199 | * then begin to interpret the results of the negotiation. | |
200 | * Always go in this order : (we are ignoring T4 for now) | |
201 | * 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD | |
202 | */ | |
203 | ||
204 | int negotiated = ((csr12 >> 16) & 0x01E0) & tp->sym_advertise; | |
205 | tp->lpar = (csr12 >> 16); | |
206 | tp->nwayset = 1; | |
207 | ||
208 | if (negotiated & 0x0100) dev->if_port = 5; | |
209 | else if (negotiated & 0x0080) dev->if_port = 3; | |
210 | else if (negotiated & 0x0040) dev->if_port = 4; | |
211 | else if (negotiated & 0x0020) dev->if_port = 0; | |
212 | else { | |
213 | if (tulip_debug > 1) | |
22086a11 JP |
214 | dev_info(&dev->dev, |
215 | "funny autonegotiate result csr12 %08x advertising %04x\n", | |
216 | csr12, tp->sym_advertise); | |
1da177e4 LT |
217 | tp->nwayset = 0; |
218 | /* so check if 100baseTx link state is okay */ | |
219 | if ((csr12 & 2) == 0 && (tp->sym_advertise & 0x0180)) | |
220 | dev->if_port = 3; | |
221 | } | |
222 | ||
223 | /* now record the duplex that was negotiated */ | |
224 | tp->full_duplex = 0; | |
225 | if ((dev->if_port == 4) || (dev->if_port == 5)) | |
226 | tp->full_duplex = 1; | |
227 | ||
228 | if (tulip_debug > 1) { | |
229 | if (tp->nwayset) | |
22086a11 JP |
230 | dev_info(&dev->dev, |
231 | "Switching to %s based on link negotiation %04x & %04x = %04x\n", | |
232 | medianame[dev->if_port], | |
233 | tp->sym_advertise, tp->lpar, | |
234 | negotiated); | |
1da177e4 LT |
235 | } |
236 | ||
237 | /* remember to turn off bit 7 - autonegotiate | |
238 | * enable so we can properly end nway mode and | |
239 | * set duplex (ie. use csr6<9> again) | |
240 | */ | |
241 | csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f); | |
242 | iowrite32(csr14,ioaddr + CSR14); | |
243 | ||
244 | ||
245 | /* now set the data port and operating mode | |
246 | * (see the Data Port Selection comments at | |
247 | * the top of the file | |
248 | */ | |
249 | ||
250 | /* get current csr6 and mask off bits not to touch */ | |
251 | /* see comment at top of file */ | |
252 | ||
253 | tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd); | |
254 | ||
255 | /* so if using if_port 3 or 5 then select the 100baseT | |
256 | * port else select the 10baseT port. | |
257 | * See the Data Port Selection table at the top | |
258 | * of the file which was taken from the PNIC_II.PDF | |
259 | * datasheet | |
260 | */ | |
261 | if (dev->if_port & 1) tp->csr6 |= 0x01840000; | |
262 | else tp->csr6 |= 0x00400000; | |
263 | ||
264 | /* now set the full duplex bit appropriately */ | |
265 | if (tp->full_duplex) tp->csr6 |= 0x00000200; | |
266 | ||
267 | iowrite32(1, ioaddr + CSR13); | |
268 | ||
269 | if (tulip_debug > 2) | |
726b65ad JP |
270 | netdev_dbg(dev, "Setting CSR6 %08x/%x CSR12 %08x\n", |
271 | tp->csr6, | |
272 | ioread32(ioaddr + CSR6), | |
273 | ioread32(ioaddr + CSR12)); | |
1da177e4 LT |
274 | |
275 | /* now the following actually writes out the | |
276 | * new csr6 values | |
277 | */ | |
278 | tulip_start_rxtx(tp); | |
279 | ||
280 | return; | |
281 | ||
282 | } else { | |
22086a11 JP |
283 | dev_info(&dev->dev, |
284 | "Autonegotiation failed, using %s, link beat status %04x\n", | |
285 | medianame[dev->if_port], csr12); | |
1da177e4 LT |
286 | |
287 | /* remember to turn off bit 7 - autonegotiate | |
288 | * enable so we don't forget | |
289 | */ | |
290 | csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f); | |
291 | iowrite32(csr14,ioaddr + CSR14); | |
292 | ||
293 | /* what should we do when autonegotiate fails? | |
294 | * should we try again or default to baseline | |
295 | * case. I just don't know. | |
296 | * | |
297 | * for now default to some baseline case | |
298 | */ | |
299 | ||
300 | dev->if_port = 0; | |
301 | tp->nway = 0; | |
302 | tp->nwayset = 1; | |
303 | ||
304 | /* set to 10baseTx-HD - see Data Port Selection | |
305 | * comment given at the top of the file | |
306 | */ | |
307 | tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd); | |
308 | tp->csr6 |= 0x00400000; | |
309 | ||
310 | tulip_restart_rxtx(tp); | |
311 | ||
312 | return; | |
313 | ||
314 | } | |
315 | } | |
316 | ||
8e95a202 JP |
317 | if ((tp->nwayset && (csr5 & 0x08000000) && |
318 | (dev->if_port == 3 || dev->if_port == 5) && | |
319 | (csr12 & 2) == 2) || (tp->nway && (csr5 & (TPLnkFail)))) { | |
1da177e4 LT |
320 | |
321 | /* Link blew? Maybe restart NWay. */ | |
322 | ||
323 | if (tulip_debug > 2) | |
726b65ad | 324 | netdev_dbg(dev, "Ugh! Link blew?\n"); |
1da177e4 LT |
325 | |
326 | del_timer_sync(&tp->timer); | |
327 | pnic2_start_nway(dev); | |
328 | tp->timer.expires = RUN_AT(3*HZ); | |
329 | add_timer(&tp->timer); | |
330 | ||
331 | return; | |
332 | } | |
333 | ||
334 | ||
335 | if (dev->if_port == 3 || dev->if_port == 5) { | |
336 | ||
337 | /* we are at 100mb and a potential link change occurred */ | |
338 | ||
339 | if (tulip_debug > 1) | |
22086a11 JP |
340 | dev_info(&dev->dev, "PNIC2 %s link beat %s\n", |
341 | medianame[dev->if_port], | |
342 | (csr12 & 2) ? "failed" : "good"); | |
1da177e4 LT |
343 | |
344 | /* check 100 link beat */ | |
345 | ||
346 | tp->nway = 0; | |
347 | tp->nwayset = 1; | |
348 | ||
349 | /* if failed then try doing an nway to get in sync */ | |
350 | if ((csr12 & 2) && ! tp->medialock) { | |
351 | del_timer_sync(&tp->timer); | |
352 | pnic2_start_nway(dev); | |
353 | tp->timer.expires = RUN_AT(3*HZ); | |
354 | add_timer(&tp->timer); | |
355 | } | |
356 | ||
357 | return; | |
358 | } | |
359 | ||
360 | if (dev->if_port == 0 || dev->if_port == 4) { | |
361 | ||
362 | /* we are at 10mb and a potential link change occurred */ | |
363 | ||
364 | if (tulip_debug > 1) | |
22086a11 JP |
365 | dev_info(&dev->dev, "PNIC2 %s link beat %s\n", |
366 | medianame[dev->if_port], | |
367 | (csr12 & 4) ? "failed" : "good"); | |
1da177e4 LT |
368 | |
369 | ||
370 | tp->nway = 0; | |
371 | tp->nwayset = 1; | |
372 | ||
373 | /* if failed, try doing an nway to get in sync */ | |
374 | if ((csr12 & 4) && ! tp->medialock) { | |
375 | del_timer_sync(&tp->timer); | |
376 | pnic2_start_nway(dev); | |
377 | tp->timer.expires = RUN_AT(3*HZ); | |
378 | add_timer(&tp->timer); | |
379 | } | |
380 | ||
381 | return; | |
382 | } | |
383 | ||
384 | ||
385 | if (tulip_debug > 1) | |
22086a11 | 386 | dev_info(&dev->dev, "PNIC2 Link Change Default?\n"); |
1da177e4 LT |
387 | |
388 | /* if all else fails default to trying 10baseT-HD */ | |
389 | dev->if_port = 0; | |
390 | ||
391 | /* make sure autonegotiate enable is off */ | |
392 | csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f); | |
393 | iowrite32(csr14,ioaddr + CSR14); | |
394 | ||
395 | /* set to 10baseTx-HD - see Data Port Selection | |
396 | * comment given at the top of the file | |
397 | */ | |
398 | tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd); | |
399 | tp->csr6 |= 0x00400000; | |
400 | ||
401 | tulip_restart_rxtx(tp); | |
402 | } | |
403 |