summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/dec/tulip/pnic2.c
blob: 5895fc43f6e0de4af0f779cd77e2a022a67ea624 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
/*
	drivers/net/ethernet/dec/tulip/pnic2.c

	Copyright 2000,2001  The Linux Kernel Team
	Written/copyright 1994-2001 by Donald Becker.
        Modified to hep support PNIC_II by Kevin B. Hendricks

	This software may be used and distributed according to the terms
	of the GNU General Public License, incorporated herein by reference.

        Please submit bugs to http://bugzilla.kernel.org/ .
*/


/* Understanding the PNIC_II - everything is this file is based
 * on the PNIC_II_PDF datasheet which is sorely lacking in detail
 *
 * As I understand things, here are the registers and bits that
 * explain the masks and constants used in this file that are
 * either different from the 21142/3 or important for basic operation.
 *
 *
 * CSR 6  (mask = 0xfe3bd1fd of bits not to change)
 * -----
 * Bit 24    - SCR
 * Bit 23    - PCS
 * Bit 22    - TTM (Trasmit Threshold Mode)
 * Bit 18    - Port Select
 * Bit 13    - Start - 1, Stop - 0 Transmissions
 * Bit 11:10 - Loop Back Operation Mode
 * Bit 9     - Full Duplex mode (Advertise 10BaseT-FD is CSR14<7> is set)
 * Bit 1     - Start - 1, Stop - 0 Receive
 *
 *
 * CSR 14  (mask = 0xfff0ee39 of bits not to change)
 * ------
 * Bit 19    - PAUSE-Pause
 * Bit 18    - Advertise T4
 * Bit 17    - Advertise 100baseTx-FD
 * Bit 16    - Advertise 100baseTx-HD
 * Bit 12    - LTE - Link Test Enable
 * Bit 7     - ANE - Auto Negotiate Enable
 * Bit 6     - HDE - Advertise 10baseT-HD
 * Bit 2     - Reset to Power down - kept as 1 for normal operation
 * Bit 1     -  Loop Back enable for 10baseT MCC
 *
 *
 * CSR 12
 * ------
 * Bit 25    - Partner can do T4
 * Bit 24    - Partner can do 100baseTx-FD
 * Bit 23    - Partner can do 100baseTx-HD
 * Bit 22    - Partner can do 10baseT-FD
 * Bit 21    - Partner can do 10baseT-HD
 * Bit 15    - LPN is 1 if all above bits are valid other wise 0
 * Bit 14:12 - autonegotiation state (write 001 to start autonegotiate)
 * Bit 3     - Autopolarity state
 * Bit 2     - LS10B - link state of 10baseT 0 - good, 1 - failed
 * Bit 1     - LS100B - link state of 100baseT 0 - good, 1 - failed
 *
 *
 * Data Port Selection Info
 *-------------------------
 *
 * CSR14<7>   CSR6<18>    CSR6<22>    CSR6<23>    CSR6<24>   MODE/PORT
 *   1           0           0 (X)       0 (X)       1        NWAY
 *   0           0           1           0 (X)       0        10baseT
 *   0           1           0           1           1 (X)    100baseT
 *
 *
 */



#include "tulip.h"
#include <linux/delay.h>


void pnic2_timer(unsigned long data)
{
	struct net_device *dev = (struct net_device *)data;
	struct tulip_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->base_addr;
	int next_tick = 60*HZ;

	if (tulip_debug > 3)
		dev_info(&dev->dev, "PNIC2 negotiation status %08x\n",
			 ioread32(ioaddr + CSR12));

	if (next_tick) {
		mod_timer(&tp->timer, RUN_AT(next_tick));
	}
}


void pnic2_start_nway(struct net_device *dev)
{
	struct tulip_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->base_addr;
        int csr14;
        int csr12;

        /* set up what to advertise during the negotiation */

        /* load in csr14  and mask off bits not to touch
         * comment at top of file explains mask value
         */
	csr14 = (ioread32(ioaddr + CSR14) & 0xfff0ee39);

        /* bit 17 - advetise 100baseTx-FD */
        if (tp->sym_advertise & 0x0100) csr14 |= 0x00020000;

        /* bit 16 - advertise 100baseTx-HD */
        if (tp->sym_advertise & 0x0080) csr14 |= 0x00010000;

        /* bit 6 - advertise 10baseT-HD */
        if (tp->sym_advertise & 0x0020) csr14 |= 0x00000040;

        /* Now set bit 12 Link Test Enable, Bit 7 Autonegotiation Enable
         * and bit 0 Don't PowerDown 10baseT
         */
        csr14 |= 0x00001184;

	if (tulip_debug > 1)
		netdev_dbg(dev, "Restarting PNIC2 autonegotiation, csr14=%08x\n",
			   csr14);

        /* tell pnic2_lnk_change we are doing an nway negotiation */
	dev->if_port = 0;
	tp->nway = tp->mediasense = 1;
	tp->nwayset = tp->lpar = 0;

        /* now we have to set up csr6 for NWAY state */

	tp->csr6 = ioread32(ioaddr + CSR6);
	if (tulip_debug > 1)
		netdev_dbg(dev, "On Entry to Nway, csr6=%08x\n", tp->csr6);

        /* mask off any bits not to touch
         * comment at top of file explains mask value
         */
	tp->csr6 = tp->csr6 & 0xfe3bd1fd;

        /* don't forget that bit 9 is also used for advertising */
        /* advertise 10baseT-FD for the negotiation (bit 9) */
        if (tp->sym_advertise & 0x0040) tp->csr6 |= 0x00000200;

        /* set bit 24 for nway negotiation mode ...
         * see Data Port Selection comment at top of file
         * and "Stop" - reset both Transmit (bit 13) and Receive (bit 1)
         */
        tp->csr6 |= 0x01000000;
	iowrite32(csr14, ioaddr + CSR14);
	iowrite32(tp->csr6, ioaddr + CSR6);
        udelay(100);

        /* all set up so now force the negotiation to begin */

        /* read in current values and mask off all but the
	 * Autonegotiation bits 14:12.  Writing a 001 to those bits
         * should start the autonegotiation
         */
        csr12 = (ioread32(ioaddr + CSR12) & 0xffff8fff);
        csr12 |= 0x1000;
	iowrite32(csr12, ioaddr + CSR12);
}



void pnic2_lnk_change(struct net_device *dev, int csr5)
{
	struct tulip_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->base_addr;
        int csr14;

        /* read the staus register to find out what is up */
	int csr12 = ioread32(ioaddr + CSR12);

	if (tulip_debug > 1)
		dev_info(&dev->dev,
			 "PNIC2 link status interrupt %08x,  CSR5 %x, %08x\n",
			 csr12, csr5, ioread32(ioaddr + CSR14));

	/* If NWay finished and we have a negotiated partner capability.
         * check bits 14:12 for bit pattern 101 - all is good
         */
	if (tp->nway  &&  !tp->nwayset) {

	        /* we did an auto negotiation */

                if ((csr12 & 0x7000) == 0x5000) {

	               /* negotiation ended successfully */

	               /* get the link partners reply and mask out all but
                        * bits 24-21 which show the partners capabilities
                        * and match those to what we advertised
                        *
                        * then begin to interpret the results of the negotiation.
                        * Always go in this order : (we are ignoring T4 for now)
                        *     100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD
                        */

		        int negotiated = ((csr12 >> 16) & 0x01E0) & tp->sym_advertise;
		        tp->lpar = (csr12 >> 16);
		        tp->nwayset = 1;

                        if (negotiated & 0x0100)        dev->if_port = 5;
		        else if (negotiated & 0x0080)	dev->if_port = 3;
		        else if (negotiated & 0x0040)	dev->if_port = 4;
			else if (negotiated & 0x0020)	dev->if_port = 0;
			else {
			     if (tulip_debug > 1)
				     dev_info(&dev->dev,
					      "funny autonegotiate result csr12 %08x advertising %04x\n",
					      csr12, tp->sym_advertise);
			     tp->nwayset = 0;
			     /* so check  if 100baseTx link state is okay */
			     if ((csr12 & 2) == 0  &&  (tp->sym_advertise & 0x0180))
			       dev->if_port = 3;
			}

			/* now record the duplex that was negotiated */
			tp->full_duplex = 0;
			if ((dev->if_port == 4) || (dev->if_port == 5))
			       tp->full_duplex = 1;

			if (tulip_debug > 1) {
			       if (tp->nwayset)
				       dev_info(&dev->dev,
						"Switching to %s based on link negotiation %04x & %04x = %04x\n",
						medianame[dev->if_port],
						tp->sym_advertise, tp->lpar,
						negotiated);
			}

                        /* remember to turn off bit 7 - autonegotiate
                         * enable so we can properly end nway mode and
                         * set duplex (ie. use csr6<9> again)
                         */
	                csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
                        iowrite32(csr14,ioaddr + CSR14);


                        /* now set the data port and operating mode
			 * (see the Data Port Selection comments at
			 * the top of the file
			 */

			/* get current csr6 and mask off bits not to touch */
			/* see comment at top of file */

			tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);

			/* so if using if_port 3 or 5 then select the 100baseT
			 * port else select the 10baseT port.
			 * See the Data Port Selection table at the top
			 * of the file which was taken from the PNIC_II.PDF
			 * datasheet
			 */
			if (dev->if_port & 1) tp->csr6 |= 0x01840000;
			else tp->csr6 |= 0x00400000;

			/* now set the full duplex bit appropriately */
			if (tp->full_duplex) tp->csr6 |= 0x00000200;

			iowrite32(1, ioaddr + CSR13);

			if (tulip_debug > 2)
				netdev_dbg(dev, "Setting CSR6 %08x/%x CSR12 %08x\n",
					   tp->csr6,
					   ioread32(ioaddr + CSR6),
					   ioread32(ioaddr + CSR12));

			/* now the following actually writes out the
			 * new csr6 values
			 */
			tulip_start_rxtx(tp);

                        return;

	        } else {
	                dev_info(&dev->dev,
				 "Autonegotiation failed, using %s, link beat status %04x\n",
				 medianame[dev->if_port], csr12);

                        /* remember to turn off bit 7 - autonegotiate
                         * enable so we don't forget
                         */
	                csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
                        iowrite32(csr14,ioaddr + CSR14);

                        /* what should we do when autonegotiate fails?
                         * should we try again or default to baseline
                         * case.  I just don't know.
                         *
                         * for now default to some baseline case
                         */

	                 dev->if_port = 0;
                         tp->nway = 0;
                         tp->nwayset = 1;

                         /* set to 10baseTx-HD - see Data Port Selection
                          * comment given at the top of the file
                          */
	                 tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
                         tp->csr6 |= 0x00400000;

	                 tulip_restart_rxtx(tp);

                         return;

		}
	}

	if ((tp->nwayset  &&  (csr5 & 0x08000000) &&
	     (dev->if_port == 3  ||  dev->if_port == 5) &&
	     (csr12 & 2) == 2) || (tp->nway && (csr5 & (TPLnkFail)))) {

		/* Link blew? Maybe restart NWay. */

		if (tulip_debug > 2)
			netdev_dbg(dev, "Ugh! Link blew?\n");

		del_timer_sync(&tp->timer);
		pnic2_start_nway(dev);
		tp->timer.expires = RUN_AT(3*HZ);
		add_timer(&tp->timer);

                return;
	}


        if (dev->if_port == 3  ||  dev->if_port == 5) {

	        /* we are at 100mb and a potential link change occurred */

		if (tulip_debug > 1)
			dev_info(&dev->dev, "PNIC2 %s link beat %s\n",
				 medianame[dev->if_port],
				 (csr12 & 2) ? "failed" : "good");

                /* check 100 link beat */

                tp->nway = 0;
                tp->nwayset = 1;

                /* if failed then try doing an nway to get in sync */
		if ((csr12 & 2)  &&  ! tp->medialock) {
			del_timer_sync(&tp->timer);
			pnic2_start_nway(dev);
			tp->timer.expires = RUN_AT(3*HZ);
       			add_timer(&tp->timer);
                }

                return;
        }

	if (dev->if_port == 0  ||  dev->if_port == 4) {

	        /* we are at 10mb and a potential link change occurred */

		if (tulip_debug > 1)
			dev_info(&dev->dev, "PNIC2 %s link beat %s\n",
				 medianame[dev->if_port],
				 (csr12 & 4) ? "failed" : "good");


                tp->nway = 0;
                tp->nwayset = 1;

                /* if failed, try doing an nway to get in sync */
		if ((csr12 & 4)  &&  ! tp->medialock) {
			del_timer_sync(&tp->timer);
			pnic2_start_nway(dev);
			tp->timer.expires = RUN_AT(3*HZ);
       			add_timer(&tp->timer);
                }

                return;
        }


	if (tulip_debug > 1)
		dev_info(&dev->dev, "PNIC2 Link Change Default?\n");

        /* if all else fails default to trying 10baseT-HD */
	dev->if_port = 0;

        /* make sure autonegotiate enable is off */
	csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
        iowrite32(csr14,ioaddr + CSR14);

        /* set to 10baseTx-HD - see Data Port Selection
         * comment given at the top of the file
         */
	tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
        tp->csr6 |= 0x00400000;

	tulip_restart_rxtx(tp);
}