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linux
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- faild
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 printk(KERN_INFO"%s: PNIC2 negotiation status %8.8x.\n",
91 dev->name,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 printk(KERN_DEBUG "%s: Restarting PNIC2 autonegotiation, "
129 "csr14=%8.8x.\n", 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, "
141 "csr6=%8.8x.\n", 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
174void 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 printk(KERN_INFO"%s: PNIC2 link status interrupt %8.8x, "
185 " CSR5 %x, %8.8x.\n", dev->name, csr12,
186 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 printk(KERN_INFO "%s: funny autonegotiate result "
219 "csr12 %8.8x advertising %4.4x\n",
220 dev->name, 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 printk(KERN_INFO "%s: Switching to %s based on link "
235 "negotiation %4.4x & %4.4x = %4.4x.\n",
236 dev->name, medianame[dev->if_port],
237 tp->sym_advertise, tp->lpar, 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 printk(KERN_DEBUG "%s: Setting CSR6 %8.8x/%x CSR12 "
274 "%8.8x.\n", dev->name, tp->csr6,
275 ioread32(ioaddr + CSR6), ioread32(ioaddr + CSR12));
276
277 /* now the following actually writes out the
278 * new csr6 values
279 */
280 tulip_start_rxtx(tp);
281
282 return;
283
284 } else {
285 printk(KERN_INFO "%s: Autonegotiation failed, "
286 "using %s, link beat status %4.4x.\n",
287 dev->name, medianame[dev->if_port], csr12);
288
289 /* remember to turn off bit 7 - autonegotiate
290 * enable so we don't forget
291 */
292 csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
293 iowrite32(csr14,ioaddr + CSR14);
294
295 /* what should we do when autonegotiate fails?
296 * should we try again or default to baseline
297 * case. I just don't know.
298 *
299 * for now default to some baseline case
300 */
301
302 dev->if_port = 0;
303 tp->nway = 0;
304 tp->nwayset = 1;
305
306 /* set to 10baseTx-HD - see Data Port Selection
307 * comment given at the top of the file
308 */
309 tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
310 tp->csr6 |= 0x00400000;
311
312 tulip_restart_rxtx(tp);
313
314 return;
315
316 }
317 }
318
319 if ((tp->nwayset && (csr5 & 0x08000000) &&
320 (dev->if_port == 3 || dev->if_port == 5) &&
321 (csr12 & 2) == 2) || (tp->nway && (csr5 & (TPLnkFail)))) {
322
323 /* Link blew? Maybe restart NWay. */
324
325 if (tulip_debug > 2)
326 printk(KERN_DEBUG "%s: Ugh! Link blew?\n", dev->name);
327
328 del_timer_sync(&tp->timer);
329 pnic2_start_nway(dev);
330 tp->timer.expires = RUN_AT(3*HZ);
331 add_timer(&tp->timer);
332
333 return;
334 }
335
336
337 if (dev->if_port == 3 || dev->if_port == 5) {
338
339 /* we are at 100mb and a potential link change occurred */
340
341 if (tulip_debug > 1)
342 printk(KERN_INFO"%s: PNIC2 %s link beat %s.\n",
343 dev->name, medianame[dev->if_port],
344 (csr12 & 2) ? "failed" : "good");
345
346 /* check 100 link beat */
347
348 tp->nway = 0;
349 tp->nwayset = 1;
350
351 /* if failed then try doing an nway to get in sync */
352 if ((csr12 & 2) && ! tp->medialock) {
353 del_timer_sync(&tp->timer);
354 pnic2_start_nway(dev);
355 tp->timer.expires = RUN_AT(3*HZ);
356 add_timer(&tp->timer);
357 }
358
359 return;
360 }
361
362 if (dev->if_port == 0 || dev->if_port == 4) {
363
364 /* we are at 10mb and a potential link change occurred */
365
366 if (tulip_debug > 1)
367 printk(KERN_INFO"%s: PNIC2 %s link beat %s.\n",
368 dev->name, medianame[dev->if_port],
369 (csr12 & 4) ? "failed" : "good");
370
371
372 tp->nway = 0;
373 tp->nwayset = 1;
374
375 /* if failed, try doing an nway to get in sync */
376 if ((csr12 & 4) && ! tp->medialock) {
377 del_timer_sync(&tp->timer);
378 pnic2_start_nway(dev);
379 tp->timer.expires = RUN_AT(3*HZ);
380 add_timer(&tp->timer);
381 }
382
383 return;
384 }
385
386
387 if (tulip_debug > 1)
388 printk(KERN_INFO"%s: PNIC2 Link Change Default?\n",dev->name);
389
390 /* if all else fails default to trying 10baseT-HD */
391 dev->if_port = 0;
392
393 /* make sure autonegotiate enable is off */
394 csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
395 iowrite32(csr14,ioaddr + CSR14);
396
397 /* set to 10baseTx-HD - see Data Port Selection
398 * comment given at the top of the file
399 */
400 tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
401 tp->csr6 |= 0x00400000;
402
403 tulip_restart_rxtx(tp);
404}
405