1 | /* |
2 | drivers/net/ethernet/dec/tulip/pnic2.c |
3 | |
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 | |
11 | Please submit bugs to http://bugzilla.kernel.org/ . |
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 |
59 | * Bit 1 - LS100B - link state of 100baseT 0 - good, 1 - failed |
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 | |
75 | #include "tulip.h" |
76 | #include <linux/delay.h> |
77 | |
78 | |
79 | void pnic2_timer(struct timer_list *t) |
80 | { |
81 | struct tulip_private *tp = from_timer(tp, t, timer); |
82 | struct net_device *dev = tp->dev; |
83 | void __iomem *ioaddr = tp->base_addr; |
84 | int next_tick = 60*HZ; |
85 | |
86 | if (tulip_debug > 3) |
87 | dev_info(&dev->dev, "PNIC2 negotiation status %08x\n" , |
88 | ioread32(ioaddr + CSR12)); |
89 | |
90 | if (next_tick) { |
91 | mod_timer(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) |
125 | netdev_dbg(dev, "Restarting PNIC2 autonegotiation, csr14=%08x\n" , |
126 | csr14); |
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) |
137 | netdev_dbg(dev, "On Entry to Nway, csr6=%08x\n" , tp->csr6); |
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) |
180 | dev_info(&dev->dev, |
181 | "PNIC2 link status interrupt %08x, CSR5 %x, %08x\n" , |
182 | csr12, csr5, ioread32(ioaddr + CSR14)); |
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 |
196 | * bits 24-21 which show the partners capabilities |
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) |
214 | dev_info(&dev->dev, |
215 | "funny autonegotiate result csr12 %08x advertising %04x\n" , |
216 | csr12, tp->sym_advertise); |
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) |
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); |
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) |
270 | netdev_dbg(dev, "Setting CSR6 %08x/%x CSR12 %08x\n" , |
271 | tp->csr6, |
272 | ioread32(ioaddr + CSR6), |
273 | ioread32(ioaddr + CSR12)); |
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 { |
283 | dev_info(&dev->dev, |
284 | "Autonegotiation failed, using %s, link beat status %04x\n" , |
285 | medianame[dev->if_port], csr12); |
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 | |
317 | if ((tp->nwayset && (csr5 & 0x08000000) && |
318 | (dev->if_port == 3 || dev->if_port == 5) && |
319 | (csr12 & 2) == 2) || (tp->nway && (csr5 & (TPLnkFail)))) { |
320 | |
321 | /* Link blew? Maybe restart NWay. */ |
322 | |
323 | if (tulip_debug > 2) |
324 | netdev_dbg(dev, "Ugh! Link blew?\n" ); |
325 | |
326 | del_timer_sync(timer: &tp->timer); |
327 | pnic2_start_nway(dev); |
328 | tp->timer.expires = RUN_AT(3*HZ); |
329 | add_timer(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) |
340 | dev_info(&dev->dev, "PNIC2 %s link beat %s\n" , |
341 | medianame[dev->if_port], |
342 | (csr12 & 2) ? "failed" : "good" ); |
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(timer: &tp->timer); |
352 | pnic2_start_nway(dev); |
353 | tp->timer.expires = RUN_AT(3*HZ); |
354 | add_timer(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) |
365 | dev_info(&dev->dev, "PNIC2 %s link beat %s\n" , |
366 | medianame[dev->if_port], |
367 | (csr12 & 4) ? "failed" : "good" ); |
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(timer: &tp->timer); |
376 | pnic2_start_nway(dev); |
377 | tp->timer.expires = RUN_AT(3*HZ); |
378 | add_timer(timer: &tp->timer); |
379 | } |
380 | |
381 | return; |
382 | } |
383 | |
384 | |
385 | if (tulip_debug > 1) |
386 | dev_info(&dev->dev, "PNIC2 Link Change Default?\n" ); |
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 | |
404 | |