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1/*
2 drivers/net/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 refer to Documentation/DocBook/tulip-user.{pdf,ps,html}
12 for more information on this driver.
13
14 Please submit bugs to http://bugzilla.kernel.org/ .
15*/
16
17
18/* Understanding the PNIC_II - everything is this file is based
19 * on the PNIC_II_PDF datasheet which is sorely lacking in detail
20 *
21 * As I understand things, here are the registers and bits that
22 * explain the masks and constants used in this file that are
23 * either different from the 21142/3 or important for basic operation.
24 *
25 *
26 * CSR 6 (mask = 0xfe3bd1fd of bits not to change)
27 * -----
28 * Bit 24 - SCR
29 * Bit 23 - PCS
30 * Bit 22 - TTM (Trasmit Threshold Mode)
31 * Bit 18 - Port Select
32 * Bit 13 - Start - 1, Stop - 0 Transmissions
33 * Bit 11:10 - Loop Back Operation Mode
34 * Bit 9 - Full Duplex mode (Advertise 10BaseT-FD is CSR14<7> is set)
35 * Bit 1 - Start - 1, Stop - 0 Receive
36 *
37 *
38 * CSR 14 (mask = 0xfff0ee39 of bits not to change)
39 * ------
40 * Bit 19 - PAUSE-Pause
41 * Bit 18 - Advertise T4
42 * Bit 17 - Advertise 100baseTx-FD
43 * Bit 16 - Advertise 100baseTx-HD
44 * Bit 12 - LTE - Link Test Enable
45 * Bit 7 - ANE - Auto Negotiate Enable
46 * Bit 6 - HDE - Advertise 10baseT-HD
47 * Bit 2 - Reset to Power down - kept as 1 for normal operation
48 * Bit 1 - Loop Back enable for 10baseT MCC
49 *
50 *
51 * CSR 12
52 * ------
53 * Bit 25 - Partner can do T4
54 * Bit 24 - Partner can do 100baseTx-FD
55 * Bit 23 - Partner can do 100baseTx-HD
56 * Bit 22 - Partner can do 10baseT-FD
57 * Bit 21 - Partner can do 10baseT-HD
58 * Bit 15 - LPN is 1 if all above bits are valid other wise 0
59 * Bit 14:12 - autonegotiation state (write 001 to start autonegotiate)
60 * Bit 3 - Autopolarity state
61 * Bit 2 - LS10B - link state of 10baseT 0 - good, 1 - failed
62 * Bit 1 - LS100B - link state of 100baseT 0 - good, 1 - failed
63 *
64 *
65 * Data Port Selection Info
66 *-------------------------
67 *
68 * CSR14<7> CSR6<18> CSR6<22> CSR6<23> CSR6<24> MODE/PORT
69 * 1 0 0 (X) 0 (X) 1 NWAY
70 * 0 0 1 0 (X) 0 10baseT
71 * 0 1 0 1 1 (X) 100baseT
72 *
73 *
74 */
75
76
77
78#include "tulip.h"
79#include <linux/delay.h>
80
81
82void pnic2_timer(unsigned long data)
83{
84 struct net_device *dev = (struct net_device *)data;
85 struct tulip_private *tp = netdev_priv(dev);
86 void __iomem *ioaddr = tp->base_addr;
87 int next_tick = 60*HZ;
88
89 if (tulip_debug > 3)
90 dev_info(&dev->dev, "PNIC2 negotiation status %08x\n",
91 ioread32(ioaddr + CSR12));
92
93 if (next_tick) {
94 mod_timer(&tp->timer, RUN_AT(next_tick));
95 }
96}
97
98
99void pnic2_start_nway(struct net_device *dev)
100{
101 struct tulip_private *tp = netdev_priv(dev);
102 void __iomem *ioaddr = tp->base_addr;
103 int csr14;
104 int csr12;
105
106 /* set up what to advertise during the negotiation */
107
108 /* load in csr14 and mask off bits not to touch
109 * comment at top of file explains mask value
110 */
111 csr14 = (ioread32(ioaddr + CSR14) & 0xfff0ee39);
112
113 /* bit 17 - advetise 100baseTx-FD */
114 if (tp->sym_advertise & 0x0100) csr14 |= 0x00020000;
115
116 /* bit 16 - advertise 100baseTx-HD */
117 if (tp->sym_advertise & 0x0080) csr14 |= 0x00010000;
118
119 /* bit 6 - advertise 10baseT-HD */
120 if (tp->sym_advertise & 0x0020) csr14 |= 0x00000040;
121
122 /* Now set bit 12 Link Test Enable, Bit 7 Autonegotiation Enable
123 * and bit 0 Don't PowerDown 10baseT
124 */
125 csr14 |= 0x00001184;
126
127 if (tulip_debug > 1)
128 netdev_dbg(dev, "Restarting PNIC2 autonegotiation, csr14=%08x\n",
129 csr14);
130
131 /* tell pnic2_lnk_change we are doing an nway negotiation */
132 dev->if_port = 0;
133 tp->nway = tp->mediasense = 1;
134 tp->nwayset = tp->lpar = 0;
135
136 /* now we have to set up csr6 for NWAY state */
137
138 tp->csr6 = ioread32(ioaddr + CSR6);
139 if (tulip_debug > 1)
140 netdev_dbg(dev, "On Entry to Nway, csr6=%08x\n", tp->csr6);
141
142 /* mask off any bits not to touch
143 * comment at top of file explains mask value
144 */
145 tp->csr6 = tp->csr6 & 0xfe3bd1fd;
146
147 /* don't forget that bit 9 is also used for advertising */
148 /* advertise 10baseT-FD for the negotiation (bit 9) */
149 if (tp->sym_advertise & 0x0040) tp->csr6 |= 0x00000200;
150
151 /* set bit 24 for nway negotiation mode ...
152 * see Data Port Selection comment at top of file
153 * and "Stop" - reset both Transmit (bit 13) and Receive (bit 1)
154 */
155 tp->csr6 |= 0x01000000;
156 iowrite32(csr14, ioaddr + CSR14);
157 iowrite32(tp->csr6, ioaddr + CSR6);
158 udelay(100);
159
160 /* all set up so now force the negotiation to begin */
161
162 /* read in current values and mask off all but the
163 * Autonegotiation bits 14:12. Writing a 001 to those bits
164 * should start the autonegotiation
165 */
166 csr12 = (ioread32(ioaddr + CSR12) & 0xffff8fff);
167 csr12 |= 0x1000;
168 iowrite32(csr12, ioaddr + CSR12);
169}
170
171
172
173void pnic2_lnk_change(struct net_device *dev, int csr5)
174{
175 struct tulip_private *tp = netdev_priv(dev);
176 void __iomem *ioaddr = tp->base_addr;
177 int csr14;
178
179 /* read the staus register to find out what is up */
180 int csr12 = ioread32(ioaddr + CSR12);
181
182 if (tulip_debug > 1)
183 dev_info(&dev->dev,
184 "PNIC2 link status interrupt %08x, CSR5 %x, %08x\n",
185 csr12, csr5, ioread32(ioaddr + CSR14));
186
187 /* If NWay finished and we have a negotiated partner capability.
188 * check bits 14:12 for bit pattern 101 - all is good
189 */
190 if (tp->nway && !tp->nwayset) {
191
192 /* we did an auto negotiation */
193
194 if ((csr12 & 0x7000) == 0x5000) {
195
196 /* negotiation ended successfully */
197
198 /* get the link partners reply and mask out all but
199 * bits 24-21 which show the partners capabilities
200 * and match those to what we advertised
201 *
202 * then begin to interpret the results of the negotiation.
203 * Always go in this order : (we are ignoring T4 for now)
204 * 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD
205 */
206
207 int negotiated = ((csr12 >> 16) & 0x01E0) & tp->sym_advertise;
208 tp->lpar = (csr12 >> 16);
209 tp->nwayset = 1;
210
211 if (negotiated & 0x0100) dev->if_port = 5;
212 else if (negotiated & 0x0080) dev->if_port = 3;
213 else if (negotiated & 0x0040) dev->if_port = 4;
214 else if (negotiated & 0x0020) dev->if_port = 0;
215 else {
216 if (tulip_debug > 1)
217 dev_info(&dev->dev,
218 "funny autonegotiate result csr12 %08x advertising %04x\n",
219 csr12, tp->sym_advertise);
220 tp->nwayset = 0;
221 /* so check if 100baseTx link state is okay */
222 if ((csr12 & 2) == 0 && (tp->sym_advertise & 0x0180))
223 dev->if_port = 3;
224 }
225
226 /* now record the duplex that was negotiated */
227 tp->full_duplex = 0;
228 if ((dev->if_port == 4) || (dev->if_port == 5))
229 tp->full_duplex = 1;
230
231 if (tulip_debug > 1) {
232 if (tp->nwayset)
233 dev_info(&dev->dev,
234 "Switching to %s based on link negotiation %04x & %04x = %04x\n",
235 medianame[dev->if_port],
236 tp->sym_advertise, tp->lpar,
237 negotiated);
238 }
239
240 /* remember to turn off bit 7 - autonegotiate
241 * enable so we can properly end nway mode and
242 * set duplex (ie. use csr6<9> again)
243 */
244 csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
245 iowrite32(csr14,ioaddr + CSR14);
246
247
248 /* now set the data port and operating mode
249 * (see the Data Port Selection comments at
250 * the top of the file
251 */
252
253 /* get current csr6 and mask off bits not to touch */
254 /* see comment at top of file */
255
256 tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
257
258 /* so if using if_port 3 or 5 then select the 100baseT
259 * port else select the 10baseT port.
260 * See the Data Port Selection table at the top
261 * of the file which was taken from the PNIC_II.PDF
262 * datasheet
263 */
264 if (dev->if_port & 1) tp->csr6 |= 0x01840000;
265 else tp->csr6 |= 0x00400000;
266
267 /* now set the full duplex bit appropriately */
268 if (tp->full_duplex) tp->csr6 |= 0x00000200;
269
270 iowrite32(1, ioaddr + CSR13);
271
272 if (tulip_debug > 2)
273 netdev_dbg(dev, "Setting CSR6 %08x/%x CSR12 %08x\n",
274 tp->csr6,
275 ioread32(ioaddr + CSR6),
276 ioread32(ioaddr + CSR12));
277
278 /* now the following actually writes out the
279 * new csr6 values
280 */
281 tulip_start_rxtx(tp);
282
283 return;
284
285 } else {
286 dev_info(&dev->dev,
287 "Autonegotiation failed, using %s, link beat status %04x\n",
288 medianame[dev->if_port], csr12);
289
290 /* remember to turn off bit 7 - autonegotiate
291 * enable so we don't forget
292 */
293 csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
294 iowrite32(csr14,ioaddr + CSR14);
295
296 /* what should we do when autonegotiate fails?
297 * should we try again or default to baseline
298 * case. I just don't know.
299 *
300 * for now default to some baseline case
301 */
302
303 dev->if_port = 0;
304 tp->nway = 0;
305 tp->nwayset = 1;
306
307 /* set to 10baseTx-HD - see Data Port Selection
308 * comment given at the top of the file
309 */
310 tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
311 tp->csr6 |= 0x00400000;
312
313 tulip_restart_rxtx(tp);
314
315 return;
316
317 }
318 }
319
320 if ((tp->nwayset && (csr5 & 0x08000000) &&
321 (dev->if_port == 3 || dev->if_port == 5) &&
322 (csr12 & 2) == 2) || (tp->nway && (csr5 & (TPLnkFail)))) {
323
324 /* Link blew? Maybe restart NWay. */
325
326 if (tulip_debug > 2)
327 netdev_dbg(dev, "Ugh! Link blew?\n");
328
329 del_timer_sync(&tp->timer);
330 pnic2_start_nway(dev);
331 tp->timer.expires = RUN_AT(3*HZ);
332 add_timer(&tp->timer);
333
334 return;
335 }
336
337
338 if (dev->if_port == 3 || dev->if_port == 5) {
339
340 /* we are at 100mb and a potential link change occurred */
341
342 if (tulip_debug > 1)
343 dev_info(&dev->dev, "PNIC2 %s link beat %s\n",
344 medianame[dev->if_port],
345 (csr12 & 2) ? "failed" : "good");
346
347 /* check 100 link beat */
348
349 tp->nway = 0;
350 tp->nwayset = 1;
351
352 /* if failed then try doing an nway to get in sync */
353 if ((csr12 & 2) && ! tp->medialock) {
354 del_timer_sync(&tp->timer);
355 pnic2_start_nway(dev);
356 tp->timer.expires = RUN_AT(3*HZ);
357 add_timer(&tp->timer);
358 }
359
360 return;
361 }
362
363 if (dev->if_port == 0 || dev->if_port == 4) {
364
365 /* we are at 10mb and a potential link change occurred */
366
367 if (tulip_debug > 1)
368 dev_info(&dev->dev, "PNIC2 %s link beat %s\n",
369 medianame[dev->if_port],
370 (csr12 & 4) ? "failed" : "good");
371
372
373 tp->nway = 0;
374 tp->nwayset = 1;
375
376 /* if failed, try doing an nway to get in sync */
377 if ((csr12 & 4) && ! tp->medialock) {
378 del_timer_sync(&tp->timer);
379 pnic2_start_nway(dev);
380 tp->timer.expires = RUN_AT(3*HZ);
381 add_timer(&tp->timer);
382 }
383
384 return;
385 }
386
387
388 if (tulip_debug > 1)
389 dev_info(&dev->dev, "PNIC2 Link Change Default?\n");
390
391 /* if all else fails default to trying 10baseT-HD */
392 dev->if_port = 0;
393
394 /* make sure autonegotiate enable is off */
395 csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
396 iowrite32(csr14,ioaddr + CSR14);
397
398 /* set to 10baseTx-HD - see Data Port Selection
399 * comment given at the top of the file
400 */
401 tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
402 tp->csr6 |= 0x00400000;
403
404 tulip_restart_rxtx(tp);
405}
406