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pnic2.c
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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(unsigned long data)
80 {
81  struct net_device *dev = (struct net_device *)data;
82  struct tulip_private *tp = netdev_priv(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 
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