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Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6/btrfs-unstable.git] / drivers / net / tulip / pnic2.c
blob4690c8e692076d518a6c8e1c3973025e59ba7e31
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
82 void 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
99 void 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 printk(KERN_DEBUG "%s: Restarting PNIC2 autonegotiation, csr14=%08x\n",
129 dev->name, 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 printk(KERN_DEBUG "%s: On Entry to Nway, csr6=%08x\n",
141 dev->name, tp->csr6);
142
143 /* mask off any bits not to touch
144 * comment at top of file explains mask value
145 */
146 tp->csr6 = tp->csr6 & 0xfe3bd1fd;
147
148 /* don't forget that bit 9 is also used for advertising */
149 /* advertise 10baseT-FD for the negotiation (bit 9) */
150 if (tp->sym_advertise & 0x0040) tp->csr6 |= 0x00000200;
151
152 /* set bit 24 for nway negotiation mode ...
153 * see Data Port Selection comment at top of file
154 * and "Stop" - reset both Transmit (bit 13) and Receive (bit 1)
155 */
156 tp->csr6 |= 0x01000000;
157 iowrite32(csr14, ioaddr + CSR14);
158 iowrite32(tp->csr6, ioaddr + CSR6);
159 udelay(100);
160
161 /* all set up so now force the negotiation to begin */
162
163 /* read in current values and mask off all but the
164 * Autonegotiation bits 14:12. Writing a 001 to those bits
165 * should start the autonegotiation
166 */
167 csr12 = (ioread32(ioaddr + CSR12) & 0xffff8fff);
168 csr12 |= 0x1000;
169 iowrite32(csr12, ioaddr + CSR12);
170 }
171
172
173
174 void pnic2_lnk_change(struct net_device *dev, int csr5)
175 {
176 struct tulip_private *tp = netdev_priv(dev);
177 void __iomem *ioaddr = tp->base_addr;
178 int csr14;
179
180 /* read the staus register to find out what is up */
181 int csr12 = ioread32(ioaddr + CSR12);
182
183 if (tulip_debug > 1)
184 dev_info(&dev->dev,
185 "PNIC2 link status interrupt %08x, CSR5 %x, %08x\n",
186 csr12, csr5, ioread32(ioaddr + CSR14));
187
188 /* If NWay finished and we have a negotiated partner capability.
189 * check bits 14:12 for bit pattern 101 - all is good
190 */
191 if (tp->nway && !tp->nwayset) {
192
193 /* we did an auto negotiation */
194
195 if ((csr12 & 0x7000) == 0x5000) {
196
197 /* negotiation ended successfully */
198
199 /* get the link partners reply and mask out all but
200 * bits 24-21 which show the partners capabilities
201 * and match those to what we advertised
202 *
203 * then begin to interpret the results of the negotiation.
204 * Always go in this order : (we are ignoring T4 for now)
205 * 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD
206 */
207
208 int negotiated = ((csr12 >> 16) & 0x01E0) & tp->sym_advertise;
209 tp->lpar = (csr12 >> 16);
210 tp->nwayset = 1;
211
212 if (negotiated & 0x0100) dev->if_port = 5;
213 else if (negotiated & 0x0080) dev->if_port = 3;
214 else if (negotiated & 0x0040) dev->if_port = 4;
215 else if (negotiated & 0x0020) dev->if_port = 0;
216 else {
217 if (tulip_debug > 1)
218 dev_info(&dev->dev,
219 "funny autonegotiate result csr12 %08x advertising %04x\n",
220 csr12, tp->sym_advertise);
221 tp->nwayset = 0;
222 /* so check if 100baseTx link state is okay */
223 if ((csr12 & 2) == 0 && (tp->sym_advertise & 0x0180))
224 dev->if_port = 3;
225 }
226
227 /* now record the duplex that was negotiated */
228 tp->full_duplex = 0;
229 if ((dev->if_port == 4) || (dev->if_port == 5))
230 tp->full_duplex = 1;
231
232 if (tulip_debug > 1) {
233 if (tp->nwayset)
234 dev_info(&dev->dev,
235 "Switching to %s based on link negotiation %04x & %04x = %04x\n",
236 medianame[dev->if_port],
237 tp->sym_advertise, tp->lpar,
238 negotiated);
239 }
240
241 /* remember to turn off bit 7 - autonegotiate
242 * enable so we can properly end nway mode and
243 * set duplex (ie. use csr6<9> again)
244 */
245 csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
246 iowrite32(csr14,ioaddr + CSR14);
247
248
249 /* now set the data port and operating mode
250 * (see the Data Port Selection comments at
251 * the top of the file
252 */
253
254 /* get current csr6 and mask off bits not to touch */
255 /* see comment at top of file */
256
257 tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
258
259 /* so if using if_port 3 or 5 then select the 100baseT
260 * port else select the 10baseT port.
261 * See the Data Port Selection table at the top
262 * of the file which was taken from the PNIC_II.PDF
263 * datasheet
264 */
265 if (dev->if_port & 1) tp->csr6 |= 0x01840000;
266 else tp->csr6 |= 0x00400000;
267
268 /* now set the full duplex bit appropriately */
269 if (tp->full_duplex) tp->csr6 |= 0x00000200;
270
271 iowrite32(1, ioaddr + CSR13);
272
273 if (tulip_debug > 2)
274 printk(KERN_DEBUG "%s: Setting CSR6 %08x/%x CSR12 %08x\n",
275 dev->name, tp->csr6,
276 ioread32(ioaddr + CSR6), 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 printk(KERN_DEBUG "%s: Ugh! Link blew?\n", dev->name);
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
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