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(&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(&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)
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(&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)
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(&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)
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