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Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / drivers / net / tulip / pnic2.c
blob4e4a879c3fa56b500b5b2c05c22c35efc1b13b1e
1 /*
2 drivers/net/tulip/pnic2.c
3
4 Maintained by Valerie Henson <val_henson@linux.intel.com>
5 Copyright 2000,2001 The Linux Kernel Team
6 Written/copyright 1994-2001 by Donald Becker.
7 Modified to hep support PNIC_II by Kevin B. Hendricks
8
9 This software may be used and distributed according to the terms
10 of the GNU General Public License, incorporated herein by reference.
11
12 Please refer to Documentation/DocBook/tulip-user.{pdf,ps,html}
13 for more information on this driver, or visit the project
14 Web page at http://sourceforge.net/projects/tulip/
15
16 */
17
18
19 /* Understanding the PNIC_II - everything is this file is based
20 * on the PNIC_II_PDF datasheet which is sorely lacking in detail
21 *
22 * As I understand things, here are the registers and bits that
23 * explain the masks and constants used in this file that are
24 * either different from the 21142/3 or important for basic operation.
25 *
26 *
27 * CSR 6 (mask = 0xfe3bd1fd of bits not to change)
28 * -----
29 * Bit 24 - SCR
30 * Bit 23 - PCS
31 * Bit 22 - TTM (Trasmit Threshold Mode)
32 * Bit 18 - Port Select
33 * Bit 13 - Start - 1, Stop - 0 Transmissions
34 * Bit 11:10 - Loop Back Operation Mode
35 * Bit 9 - Full Duplex mode (Advertise 10BaseT-FD is CSR14<7> is set)
36 * Bit 1 - Start - 1, Stop - 0 Receive
37 *
38 *
39 * CSR 14 (mask = 0xfff0ee39 of bits not to change)
40 * ------
41 * Bit 19 - PAUSE-Pause
42 * Bit 18 - Advertise T4
43 * Bit 17 - Advertise 100baseTx-FD
44 * Bit 16 - Advertise 100baseTx-HD
45 * Bit 12 - LTE - Link Test Enable
46 * Bit 7 - ANE - Auto Negotiate Enable
47 * Bit 6 - HDE - Advertise 10baseT-HD
48 * Bit 2 - Reset to Power down - kept as 1 for normal operation
49 * Bit 1 - Loop Back enable for 10baseT MCC
50 *
51 *
52 * CSR 12
53 * ------
54 * Bit 25 - Partner can do T4
55 * Bit 24 - Partner can do 100baseTx-FD
56 * Bit 23 - Partner can do 100baseTx-HD
57 * Bit 22 - Partner can do 10baseT-FD
58 * Bit 21 - Partner can do 10baseT-HD
59 * Bit 15 - LPN is 1 if all above bits are valid other wise 0
60 * Bit 14:12 - autonegotiation state (write 001 to start autonegotiate)
61 * Bit 3 - Autopolarity state
62 * Bit 2 - LS10B - link state of 10baseT 0 - good, 1 - failed
63 * Bit 1 - LS100B - link state of 100baseT 0 - good, 1- faild
64 *
65 *
66 * Data Port Selection Info
67 *-------------------------
68 *
69 * CSR14<7> CSR6<18> CSR6<22> CSR6<23> CSR6<24> MODE/PORT
70 * 1 0 0 (X) 0 (X) 1 NWAY
71 * 0 0 1 0 (X) 0 10baseT
72 * 0 1 0 1 1 (X) 100baseT
73 *
74 *
75 */
76
77
78
79 #include "tulip.h"
80 #include <linux/delay.h>
81
82
83 void pnic2_timer(unsigned long data)
84 {
85 struct net_device *dev = (struct net_device *)data;
86 struct tulip_private *tp = netdev_priv(dev);
87 void __iomem *ioaddr = tp->base_addr;
88 int next_tick = 60*HZ;
89
90 if (tulip_debug > 3)
91 printk(KERN_INFO"%s: PNIC2 negotiation status %8.8x.\n",
92 dev->name,ioread32(ioaddr + CSR12));
93
94 if (next_tick) {
95 mod_timer(&tp->timer, RUN_AT(next_tick));
96 }
97 }
98
99
100 void pnic2_start_nway(struct net_device *dev)
101 {
102 struct tulip_private *tp = netdev_priv(dev);
103 void __iomem *ioaddr = tp->base_addr;
104 int csr14;
105 int csr12;
106
107 /* set up what to advertise during the negotiation */
108
109 /* load in csr14 and mask off bits not to touch
110 * comment at top of file explains mask value
111 */
112 csr14 = (ioread32(ioaddr + CSR14) & 0xfff0ee39);
113
114 /* bit 17 - advetise 100baseTx-FD */
115 if (tp->sym_advertise & 0x0100) csr14 |= 0x00020000;
116
117 /* bit 16 - advertise 100baseTx-HD */
118 if (tp->sym_advertise & 0x0080) csr14 |= 0x00010000;
119
120 /* bit 6 - advertise 10baseT-HD */
121 if (tp->sym_advertise & 0x0020) csr14 |= 0x00000040;
122
123 /* Now set bit 12 Link Test Enable, Bit 7 Autonegotiation Enable
124 * and bit 0 Don't PowerDown 10baseT
125 */
126 csr14 |= 0x00001184;
127
128 if (tulip_debug > 1)
129 printk(KERN_DEBUG "%s: Restarting PNIC2 autonegotiation, "
130 "csr14=%8.8x.\n", dev->name, csr14);
131
132 /* tell pnic2_lnk_change we are doing an nway negotiation */
133 dev->if_port = 0;
134 tp->nway = tp->mediasense = 1;
135 tp->nwayset = tp->lpar = 0;
136
137 /* now we have to set up csr6 for NWAY state */
138
139 tp->csr6 = ioread32(ioaddr + CSR6);
140 if (tulip_debug > 1)
141 printk(KERN_DEBUG "%s: On Entry to Nway, "
142 "csr6=%8.8x.\n", dev->name, tp->csr6);
143
144 /* mask off any bits not to touch
145 * comment at top of file explains mask value
146 */
147 tp->csr6 = tp->csr6 & 0xfe3bd1fd;
148
149 /* don't forget that bit 9 is also used for advertising */
150 /* advertise 10baseT-FD for the negotiation (bit 9) */
151 if (tp->sym_advertise & 0x0040) tp->csr6 |= 0x00000200;
152
153 /* set bit 24 for nway negotiation mode ...
154 * see Data Port Selection comment at top of file
155 * and "Stop" - reset both Transmit (bit 13) and Receive (bit 1)
156 */
157 tp->csr6 |= 0x01000000;
158 iowrite32(csr14, ioaddr + CSR14);
159 iowrite32(tp->csr6, ioaddr + CSR6);
160 udelay(100);
161
162 /* all set up so now force the negotiation to begin */
163
164 /* read in current values and mask off all but the
165 * Autonegotiation bits 14:12. Writing a 001 to those bits
166 * should start the autonegotiation
167 */
168 csr12 = (ioread32(ioaddr + CSR12) & 0xffff8fff);
169 csr12 |= 0x1000;
170 iowrite32(csr12, ioaddr + CSR12);
171 }
172
173
174
175 void pnic2_lnk_change(struct net_device *dev, int csr5)
176 {
177 struct tulip_private *tp = netdev_priv(dev);
178 void __iomem *ioaddr = tp->base_addr;
179 int csr14;
180
181 /* read the staus register to find out what is up */
182 int csr12 = ioread32(ioaddr + CSR12);
183
184 if (tulip_debug > 1)
185 printk(KERN_INFO"%s: PNIC2 link status interrupt %8.8x, "
186 " CSR5 %x, %8.8x.\n", dev->name, csr12,
187 csr5, ioread32(ioaddr + CSR14));
188
189 /* If NWay finished and we have a negotiated partner capability.
190 * check bits 14:12 for bit pattern 101 - all is good
191 */
192 if (tp->nway && !tp->nwayset) {
193
194 /* we did an auto negotiation */
195
196 if ((csr12 & 0x7000) == 0x5000) {
197
198 /* negotiation ended successfully */
199
200 /* get the link partners reply and mask out all but
201 * bits 24-21 which show the partners capabilities
202 * and match those to what we advertised
203 *
204 * then begin to interpret the results of the negotiation.
205 * Always go in this order : (we are ignoring T4 for now)
206 * 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD
207 */
208
209 int negotiated = ((csr12 >> 16) & 0x01E0) & tp->sym_advertise;
210 tp->lpar = (csr12 >> 16);
211 tp->nwayset = 1;
212
213 if (negotiated & 0x0100) dev->if_port = 5;
214 else if (negotiated & 0x0080) dev->if_port = 3;
215 else if (negotiated & 0x0040) dev->if_port = 4;
216 else if (negotiated & 0x0020) dev->if_port = 0;
217 else {
218 if (tulip_debug > 1)
219 printk(KERN_INFO "%s: funny autonegotiate result "
220 "csr12 %8.8x advertising %4.4x\n",
221 dev->name, csr12, tp->sym_advertise);
222 tp->nwayset = 0;
223 /* so check if 100baseTx link state is okay */
224 if ((csr12 & 2) == 0 && (tp->sym_advertise & 0x0180))
225 dev->if_port = 3;
226 }
227
228 /* now record the duplex that was negotiated */
229 tp->full_duplex = 0;
230 if ((dev->if_port == 4) || (dev->if_port == 5))
231 tp->full_duplex = 1;
232
233 if (tulip_debug > 1) {
234 if (tp->nwayset)
235 printk(KERN_INFO "%s: Switching to %s based on link "
236 "negotiation %4.4x & %4.4x = %4.4x.\n",
237 dev->name, medianame[dev->if_port],
238 tp->sym_advertise, tp->lpar, 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 %8.8x/%x CSR12 "
275 "%8.8x.\n", 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 printk(KERN_INFO "%s: Autonegotiation failed, "
287 "using %s, link beat status %4.4x.\n",
288 dev->name, 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 printk(KERN_INFO"%s: PNIC2 %s link beat %s.\n",
344 dev->name, 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 printk(KERN_INFO"%s: PNIC2 %s link beat %s.\n",
369 dev->name, 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 printk(KERN_INFO"%s: PNIC2 Link Change Default?\n",dev->name);
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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