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 
pnic2_timer(struct timer_list * t)79 void pnic2_timer(struct timer_list *t)
80 {
81 	struct tulip_private *tp = from_timer(tp, t, timer);
82 	struct net_device *dev = tp->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 
pnic2_start_nway(struct net_device * dev)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 
pnic2_lnk_change(struct net_device * dev,int csr5)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 
404