summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/ath/ath9k/ani.c
blob: 3da820ffc65eefbaee5023fd3408011948be0541 (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
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
/*
 * Copyright (c) 2008-2009 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "hw.h"
#include "hw-ops.h"

static int ath9k_hw_get_ani_channel_idx(struct ath_hw *ah,
					struct ath9k_channel *chan)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(ah->ani); i++) {
		if (ah->ani[i].c &&
		    ah->ani[i].c->channel == chan->channel)
			return i;
		if (ah->ani[i].c == NULL) {
			ah->ani[i].c = chan;
			return i;
		}
	}

	ath_print(ath9k_hw_common(ah), ATH_DBG_ANI,
		  "No more channel states left. Using channel 0\n");

	return 0;
}

static void ath9k_hw_update_mibstats(struct ath_hw *ah,
				     struct ath9k_mib_stats *stats)
{
	stats->ackrcv_bad += REG_READ(ah, AR_ACK_FAIL);
	stats->rts_bad += REG_READ(ah, AR_RTS_FAIL);
	stats->fcs_bad += REG_READ(ah, AR_FCS_FAIL);
	stats->rts_good += REG_READ(ah, AR_RTS_OK);
	stats->beacons += REG_READ(ah, AR_BEACON_CNT);
}

static void ath9k_ani_restart(struct ath_hw *ah)
{
	struct ar5416AniState *aniState;
	struct ath_common *common = ath9k_hw_common(ah);

	if (!DO_ANI(ah))
		return;

	aniState = ah->curani;
	aniState->listenTime = 0;

	if (aniState->ofdmTrigHigh > AR_PHY_COUNTMAX) {
		aniState->ofdmPhyErrBase = 0;
		ath_print(common, ATH_DBG_ANI,
			  "OFDM Trigger is too high for hw counters\n");
	} else {
		aniState->ofdmPhyErrBase =
			AR_PHY_COUNTMAX - aniState->ofdmTrigHigh;
	}
	if (aniState->cckTrigHigh > AR_PHY_COUNTMAX) {
		aniState->cckPhyErrBase = 0;
		ath_print(common, ATH_DBG_ANI,
			  "CCK Trigger is too high for hw counters\n");
	} else {
		aniState->cckPhyErrBase =
			AR_PHY_COUNTMAX - aniState->cckTrigHigh;
	}
	ath_print(common, ATH_DBG_ANI,
		  "Writing ofdmbase=%u   cckbase=%u\n",
		  aniState->ofdmPhyErrBase,
		  aniState->cckPhyErrBase);

	ENABLE_REGWRITE_BUFFER(ah);

	REG_WRITE(ah, AR_PHY_ERR_1, aniState->ofdmPhyErrBase);
	REG_WRITE(ah, AR_PHY_ERR_2, aniState->cckPhyErrBase);
	REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
	REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);

	REGWRITE_BUFFER_FLUSH(ah);
	DISABLE_REGWRITE_BUFFER(ah);

	ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);

	aniState->ofdmPhyErrCount = 0;
	aniState->cckPhyErrCount = 0;
}

static void ath9k_hw_ani_ofdm_err_trigger(struct ath_hw *ah)
{
	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
	struct ar5416AniState *aniState;
	int32_t rssi;

	if (!DO_ANI(ah))
		return;

	aniState = ah->curani;

	if (aniState->noiseImmunityLevel < HAL_NOISE_IMMUNE_MAX) {
		if (ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
					 aniState->noiseImmunityLevel + 1)) {
			return;
		}
	}

	if (aniState->spurImmunityLevel < HAL_SPUR_IMMUNE_MAX) {
		if (ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
					 aniState->spurImmunityLevel + 1)) {
			return;
		}
	}

	if (ah->opmode == NL80211_IFTYPE_AP) {
		if (aniState->firstepLevel < HAL_FIRST_STEP_MAX) {
			ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
					     aniState->firstepLevel + 1);
		}
		return;
	}
	rssi = BEACON_RSSI(ah);
	if (rssi > aniState->rssiThrHigh) {
		if (!aniState->ofdmWeakSigDetectOff) {
			if (ath9k_hw_ani_control(ah,
					 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
					 false)) {
				ath9k_hw_ani_control(ah,
					ATH9K_ANI_SPUR_IMMUNITY_LEVEL, 0);
				return;
			}
		}
		if (aniState->firstepLevel < HAL_FIRST_STEP_MAX) {
			ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
					     aniState->firstepLevel + 1);
			return;
		}
	} else if (rssi > aniState->rssiThrLow) {
		if (aniState->ofdmWeakSigDetectOff)
			ath9k_hw_ani_control(ah,
				     ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
				     true);
		if (aniState->firstepLevel < HAL_FIRST_STEP_MAX)
			ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
					     aniState->firstepLevel + 1);
		return;
	} else {
		if ((conf->channel->band == IEEE80211_BAND_2GHZ) &&
		    !conf_is_ht(conf)) {
			if (!aniState->ofdmWeakSigDetectOff)
				ath9k_hw_ani_control(ah,
				     ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
				     false);
			if (aniState->firstepLevel > 0)
				ath9k_hw_ani_control(ah,
					     ATH9K_ANI_FIRSTEP_LEVEL, 0);
			return;
		}
	}
}

static void ath9k_hw_ani_cck_err_trigger(struct ath_hw *ah)
{
	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
	struct ar5416AniState *aniState;
	int32_t rssi;

	if (!DO_ANI(ah))
		return;

	aniState = ah->curani;
	if (aniState->noiseImmunityLevel < HAL_NOISE_IMMUNE_MAX) {
		if (ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
					 aniState->noiseImmunityLevel + 1)) {
			return;
		}
	}
	if (ah->opmode == NL80211_IFTYPE_AP) {
		if (aniState->firstepLevel < HAL_FIRST_STEP_MAX) {
			ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
					     aniState->firstepLevel + 1);
		}
		return;
	}
	rssi = BEACON_RSSI(ah);
	if (rssi > aniState->rssiThrLow) {
		if (aniState->firstepLevel < HAL_FIRST_STEP_MAX)
			ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
					     aniState->firstepLevel + 1);
	} else {
		if ((conf->channel->band == IEEE80211_BAND_2GHZ) &&
		    !conf_is_ht(conf)) {
			if (aniState->firstepLevel > 0)
				ath9k_hw_ani_control(ah,
					     ATH9K_ANI_FIRSTEP_LEVEL, 0);
		}
	}
}

static void ath9k_hw_ani_lower_immunity(struct ath_hw *ah)
{
	struct ar5416AniState *aniState;
	int32_t rssi;

	aniState = ah->curani;

	if (ah->opmode == NL80211_IFTYPE_AP) {
		if (aniState->firstepLevel > 0) {
			if (ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
						 aniState->firstepLevel - 1))
				return;
		}
	} else {
		rssi = BEACON_RSSI(ah);
		if (rssi > aniState->rssiThrHigh) {
			/* XXX: Handle me */
		} else if (rssi > aniState->rssiThrLow) {
			if (aniState->ofdmWeakSigDetectOff) {
				if (ath9k_hw_ani_control(ah,
					 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
					 true) == true)
					return;
			}
			if (aniState->firstepLevel > 0) {
				if (ath9k_hw_ani_control(ah,
					 ATH9K_ANI_FIRSTEP_LEVEL,
					 aniState->firstepLevel - 1) == true)
					return;
			}
		} else {
			if (aniState->firstepLevel > 0) {
				if (ath9k_hw_ani_control(ah,
					 ATH9K_ANI_FIRSTEP_LEVEL,
					 aniState->firstepLevel - 1) == true)
					return;
			}
		}
	}

	if (aniState->spurImmunityLevel > 0) {
		if (ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
					 aniState->spurImmunityLevel - 1))
			return;
	}

	if (aniState->noiseImmunityLevel > 0) {
		ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
				     aniState->noiseImmunityLevel - 1);
		return;
	}
}

static int32_t ath9k_hw_ani_get_listen_time(struct ath_hw *ah)
{
	struct ar5416AniState *aniState;
	u32 txFrameCount, rxFrameCount, cycleCount;
	int32_t listenTime;

	txFrameCount = REG_READ(ah, AR_TFCNT);
	rxFrameCount = REG_READ(ah, AR_RFCNT);
	cycleCount = REG_READ(ah, AR_CCCNT);

	aniState = ah->curani;
	if (aniState->cycleCount == 0 || aniState->cycleCount > cycleCount) {

		listenTime = 0;
		ah->stats.ast_ani_lzero++;
	} else {
		int32_t ccdelta = cycleCount - aniState->cycleCount;
		int32_t rfdelta = rxFrameCount - aniState->rxFrameCount;
		int32_t tfdelta = txFrameCount - aniState->txFrameCount;
		listenTime = (ccdelta - rfdelta - tfdelta) / 44000;
	}
	aniState->cycleCount = cycleCount;
	aniState->txFrameCount = txFrameCount;
	aniState->rxFrameCount = rxFrameCount;

	return listenTime;
}

void ath9k_ani_reset(struct ath_hw *ah)
{
	struct ar5416AniState *aniState;
	struct ath9k_channel *chan = ah->curchan;
	struct ath_common *common = ath9k_hw_common(ah);
	int index;

	if (!DO_ANI(ah))
		return;

	index = ath9k_hw_get_ani_channel_idx(ah, chan);
	aniState = &ah->ani[index];
	ah->curani = aniState;

	if (DO_ANI(ah) && ah->opmode != NL80211_IFTYPE_STATION
	    && ah->opmode != NL80211_IFTYPE_ADHOC) {
		ath_print(common, ATH_DBG_ANI,
			  "Reset ANI state opmode %u\n", ah->opmode);
		ah->stats.ast_ani_reset++;

		if (ah->opmode == NL80211_IFTYPE_AP) {
			/*
			 * ath9k_hw_ani_control() will only process items set on
			 * ah->ani_function
			 */
			if (IS_CHAN_2GHZ(chan))
				ah->ani_function = (ATH9K_ANI_SPUR_IMMUNITY_LEVEL |
						    ATH9K_ANI_FIRSTEP_LEVEL);
			else
				ah->ani_function = 0;
		}

		ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL, 0);
		ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL, 0);
		ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL, 0);
		ath9k_hw_ani_control(ah, ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
				     !ATH9K_ANI_USE_OFDM_WEAK_SIG);
		ath9k_hw_ani_control(ah, ATH9K_ANI_CCK_WEAK_SIGNAL_THR,
				     ATH9K_ANI_CCK_WEAK_SIG_THR);

		ath9k_hw_setrxfilter(ah, ath9k_hw_getrxfilter(ah) |
				     ATH9K_RX_FILTER_PHYERR);

		if (ah->opmode == NL80211_IFTYPE_AP) {
			ah->curani->ofdmTrigHigh =
				ah->config.ofdm_trig_high;
			ah->curani->ofdmTrigLow =
				ah->config.ofdm_trig_low;
			ah->curani->cckTrigHigh =
				ah->config.cck_trig_high;
			ah->curani->cckTrigLow =
				ah->config.cck_trig_low;
		}
		ath9k_ani_restart(ah);
		return;
	}

	if (aniState->noiseImmunityLevel != 0)
		ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
				     aniState->noiseImmunityLevel);
	if (aniState->spurImmunityLevel != 0)
		ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
				     aniState->spurImmunityLevel);
	if (aniState->ofdmWeakSigDetectOff)
		ath9k_hw_ani_control(ah, ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
				     !aniState->ofdmWeakSigDetectOff);
	if (aniState->cckWeakSigThreshold)
		ath9k_hw_ani_control(ah, ATH9K_ANI_CCK_WEAK_SIGNAL_THR,
				     aniState->cckWeakSigThreshold);
	if (aniState->firstepLevel != 0)
		ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
				     aniState->firstepLevel);

	ath9k_hw_setrxfilter(ah, ath9k_hw_getrxfilter(ah) &
			     ~ATH9K_RX_FILTER_PHYERR);
	ath9k_ani_restart(ah);

	ENABLE_REGWRITE_BUFFER(ah);

	REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
	REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);

	REGWRITE_BUFFER_FLUSH(ah);
	DISABLE_REGWRITE_BUFFER(ah);
}

void ath9k_hw_ani_monitor(struct ath_hw *ah,
			  struct ath9k_channel *chan)
{
	struct ar5416AniState *aniState;
	struct ath_common *common = ath9k_hw_common(ah);
	int32_t listenTime;
	u32 phyCnt1, phyCnt2;
	u32 ofdmPhyErrCnt, cckPhyErrCnt;

	if (!DO_ANI(ah))
		return;

	aniState = ah->curani;

	listenTime = ath9k_hw_ani_get_listen_time(ah);
	if (listenTime < 0) {
		ah->stats.ast_ani_lneg++;
		ath9k_ani_restart(ah);
		return;
	}

	aniState->listenTime += listenTime;

	ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);

	phyCnt1 = REG_READ(ah, AR_PHY_ERR_1);
	phyCnt2 = REG_READ(ah, AR_PHY_ERR_2);

	if (phyCnt1 < aniState->ofdmPhyErrBase ||
	    phyCnt2 < aniState->cckPhyErrBase) {
		if (phyCnt1 < aniState->ofdmPhyErrBase) {
			ath_print(common, ATH_DBG_ANI,
				  "phyCnt1 0x%x, resetting "
				  "counter value to 0x%x\n",
				  phyCnt1,
				  aniState->ofdmPhyErrBase);
			REG_WRITE(ah, AR_PHY_ERR_1,
				  aniState->ofdmPhyErrBase);
			REG_WRITE(ah, AR_PHY_ERR_MASK_1,
				  AR_PHY_ERR_OFDM_TIMING);
		}
		if (phyCnt2 < aniState->cckPhyErrBase) {
			ath_print(common, ATH_DBG_ANI,
				  "phyCnt2 0x%x, resetting "
				  "counter value to 0x%x\n",
				  phyCnt2,
				  aniState->cckPhyErrBase);
			REG_WRITE(ah, AR_PHY_ERR_2,
				  aniState->cckPhyErrBase);
			REG_WRITE(ah, AR_PHY_ERR_MASK_2,
				  AR_PHY_ERR_CCK_TIMING);
		}
		return;
	}

	ofdmPhyErrCnt = phyCnt1 - aniState->ofdmPhyErrBase;
	ah->stats.ast_ani_ofdmerrs +=
		ofdmPhyErrCnt - aniState->ofdmPhyErrCount;
	aniState->ofdmPhyErrCount = ofdmPhyErrCnt;

	cckPhyErrCnt = phyCnt2 - aniState->cckPhyErrBase;
	ah->stats.ast_ani_cckerrs +=
		cckPhyErrCnt - aniState->cckPhyErrCount;
	aniState->cckPhyErrCount = cckPhyErrCnt;

	if (aniState->listenTime > 5 * ah->aniperiod) {
		if (aniState->ofdmPhyErrCount <= aniState->listenTime *
		    aniState->ofdmTrigLow / 1000 &&
		    aniState->cckPhyErrCount <= aniState->listenTime *
		    aniState->cckTrigLow / 1000)
			ath9k_hw_ani_lower_immunity(ah);
		ath9k_ani_restart(ah);
	} else if (aniState->listenTime > ah->aniperiod) {
		if (aniState->ofdmPhyErrCount > aniState->listenTime *
		    aniState->ofdmTrigHigh / 1000) {
			ath9k_hw_ani_ofdm_err_trigger(ah);
			ath9k_ani_restart(ah);
		} else if (aniState->cckPhyErrCount >
			   aniState->listenTime * aniState->cckTrigHigh /
			   1000) {
			ath9k_hw_ani_cck_err_trigger(ah);
			ath9k_ani_restart(ah);
		}
	}
}
EXPORT_SYMBOL(ath9k_hw_ani_monitor);

void ath9k_enable_mib_counters(struct ath_hw *ah)
{
	struct ath_common *common = ath9k_hw_common(ah);

	ath_print(common, ATH_DBG_ANI, "Enable MIB counters\n");

	ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);

	ENABLE_REGWRITE_BUFFER(ah);

	REG_WRITE(ah, AR_FILT_OFDM, 0);
	REG_WRITE(ah, AR_FILT_CCK, 0);
	REG_WRITE(ah, AR_MIBC,
		  ~(AR_MIBC_COW | AR_MIBC_FMC | AR_MIBC_CMC | AR_MIBC_MCS)
		  & 0x0f);
	REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
	REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);

	REGWRITE_BUFFER_FLUSH(ah);
	DISABLE_REGWRITE_BUFFER(ah);
}

/* Freeze the MIB counters, get the stats and then clear them */
void ath9k_hw_disable_mib_counters(struct ath_hw *ah)
{
	struct ath_common *common = ath9k_hw_common(ah);

	ath_print(common, ATH_DBG_ANI, "Disable MIB counters\n");

	REG_WRITE(ah, AR_MIBC, AR_MIBC_FMC);
	ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
	REG_WRITE(ah, AR_MIBC, AR_MIBC_CMC);
	REG_WRITE(ah, AR_FILT_OFDM, 0);
	REG_WRITE(ah, AR_FILT_CCK, 0);
}
EXPORT_SYMBOL(ath9k_hw_disable_mib_counters);

u32 ath9k_hw_GetMibCycleCountsPct(struct ath_hw *ah,
				  u32 *rxc_pcnt,
				  u32 *rxf_pcnt,
				  u32 *txf_pcnt)
{
	struct ath_common *common = ath9k_hw_common(ah);
	static u32 cycles, rx_clear, rx_frame, tx_frame;
	u32 good = 1;

	u32 rc = REG_READ(ah, AR_RCCNT);
	u32 rf = REG_READ(ah, AR_RFCNT);
	u32 tf = REG_READ(ah, AR_TFCNT);
	u32 cc = REG_READ(ah, AR_CCCNT);

	if (cycles == 0 || cycles > cc) {
		ath_print(common, ATH_DBG_ANI,
			  "cycle counter wrap. ExtBusy = 0\n");
		good = 0;
	} else {
		u32 cc_d = cc - cycles;
		u32 rc_d = rc - rx_clear;
		u32 rf_d = rf - rx_frame;
		u32 tf_d = tf - tx_frame;

		if (cc_d != 0) {
			*rxc_pcnt = rc_d * 100 / cc_d;
			*rxf_pcnt = rf_d * 100 / cc_d;
			*txf_pcnt = tf_d * 100 / cc_d;
		} else {
			good = 0;
		}
	}

	cycles = cc;
	rx_frame = rf;
	rx_clear = rc;
	tx_frame = tf;

	return good;
}

/*
 * Process a MIB interrupt.  We may potentially be invoked because
 * any of the MIB counters overflow/trigger so don't assume we're
 * here because a PHY error counter triggered.
 */
void ath9k_hw_procmibevent(struct ath_hw *ah)
{
	u32 phyCnt1, phyCnt2;

	/* Reset these counters regardless */
	REG_WRITE(ah, AR_FILT_OFDM, 0);
	REG_WRITE(ah, AR_FILT_CCK, 0);
	if (!(REG_READ(ah, AR_SLP_MIB_CTRL) & AR_SLP_MIB_PENDING))
		REG_WRITE(ah, AR_SLP_MIB_CTRL, AR_SLP_MIB_CLEAR);

	/* Clear the mib counters and save them in the stats */
	ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);

	if (!DO_ANI(ah))
		return;

	/* NB: these are not reset-on-read */
	phyCnt1 = REG_READ(ah, AR_PHY_ERR_1);
	phyCnt2 = REG_READ(ah, AR_PHY_ERR_2);
	if (((phyCnt1 & AR_MIBCNT_INTRMASK) == AR_MIBCNT_INTRMASK) ||
	    ((phyCnt2 & AR_MIBCNT_INTRMASK) == AR_MIBCNT_INTRMASK)) {
		struct ar5416AniState *aniState = ah->curani;
		u32 ofdmPhyErrCnt, cckPhyErrCnt;

		/* NB: only use ast_ani_*errs with AH_PRIVATE_DIAG */
		ofdmPhyErrCnt = phyCnt1 - aniState->ofdmPhyErrBase;
		ah->stats.ast_ani_ofdmerrs +=
			ofdmPhyErrCnt - aniState->ofdmPhyErrCount;
		aniState->ofdmPhyErrCount = ofdmPhyErrCnt;

		cckPhyErrCnt = phyCnt2 - aniState->cckPhyErrBase;
		ah->stats.ast_ani_cckerrs +=
			cckPhyErrCnt - aniState->cckPhyErrCount;
		aniState->cckPhyErrCount = cckPhyErrCnt;

		/*
		 * NB: figure out which counter triggered.  If both
		 * trigger we'll only deal with one as the processing
		 * clobbers the error counter so the trigger threshold
		 * check will never be true.
		 */
		if (aniState->ofdmPhyErrCount > aniState->ofdmTrigHigh)
			ath9k_hw_ani_ofdm_err_trigger(ah);
		if (aniState->cckPhyErrCount > aniState->cckTrigHigh)
			ath9k_hw_ani_cck_err_trigger(ah);
		/* NB: always restart to insure the h/w counters are reset */
		ath9k_ani_restart(ah);
	}
}
EXPORT_SYMBOL(ath9k_hw_procmibevent);

void ath9k_hw_ani_setup(struct ath_hw *ah)
{
	int i;

	const int totalSizeDesired[] = { -55, -55, -55, -55, -62 };
	const int coarseHigh[] = { -14, -14, -14, -14, -12 };
	const int coarseLow[] = { -64, -64, -64, -64, -70 };
	const int firpwr[] = { -78, -78, -78, -78, -80 };

	for (i = 0; i < 5; i++) {
		ah->totalSizeDesired[i] = totalSizeDesired[i];
		ah->coarse_high[i] = coarseHigh[i];
		ah->coarse_low[i] = coarseLow[i];
		ah->firpwr[i] = firpwr[i];
	}
}

void ath9k_hw_ani_init(struct ath_hw *ah)
{
	struct ath_common *common = ath9k_hw_common(ah);
	int i;

	ath_print(common, ATH_DBG_ANI, "Initialize ANI\n");

	memset(ah->ani, 0, sizeof(ah->ani));
	for (i = 0; i < ARRAY_SIZE(ah->ani); i++) {
		ah->ani[i].ofdmTrigHigh = ATH9K_ANI_OFDM_TRIG_HIGH;
		ah->ani[i].ofdmTrigLow = ATH9K_ANI_OFDM_TRIG_LOW;
		ah->ani[i].cckTrigHigh = ATH9K_ANI_CCK_TRIG_HIGH;
		ah->ani[i].cckTrigLow = ATH9K_ANI_CCK_TRIG_LOW;
		ah->ani[i].rssiThrHigh = ATH9K_ANI_RSSI_THR_HIGH;
		ah->ani[i].rssiThrLow = ATH9K_ANI_RSSI_THR_LOW;
		ah->ani[i].ofdmWeakSigDetectOff =
			!ATH9K_ANI_USE_OFDM_WEAK_SIG;
		ah->ani[i].cckWeakSigThreshold =
			ATH9K_ANI_CCK_WEAK_SIG_THR;
		ah->ani[i].spurImmunityLevel = ATH9K_ANI_SPUR_IMMUNE_LVL;
		ah->ani[i].firstepLevel = ATH9K_ANI_FIRSTEP_LVL;
		ah->ani[i].ofdmPhyErrBase =
			AR_PHY_COUNTMAX - ATH9K_ANI_OFDM_TRIG_HIGH;
		ah->ani[i].cckPhyErrBase =
			AR_PHY_COUNTMAX - ATH9K_ANI_CCK_TRIG_HIGH;
	}

	ath_print(common, ATH_DBG_ANI,
		  "Setting OfdmErrBase = 0x%08x\n",
		  ah->ani[0].ofdmPhyErrBase);
	ath_print(common, ATH_DBG_ANI, "Setting cckErrBase = 0x%08x\n",
		  ah->ani[0].cckPhyErrBase);

	ENABLE_REGWRITE_BUFFER(ah);

	REG_WRITE(ah, AR_PHY_ERR_1, ah->ani[0].ofdmPhyErrBase);
	REG_WRITE(ah, AR_PHY_ERR_2, ah->ani[0].cckPhyErrBase);

	REGWRITE_BUFFER_FLUSH(ah);
	DISABLE_REGWRITE_BUFFER(ah);

	ath9k_enable_mib_counters(ah);

	ah->aniperiod = ATH9K_ANI_PERIOD;
	if (ah->config.enable_ani)
		ah->proc_phyerr |= HAL_PROCESS_ANI;
}
OpenPOWER on IntegriCloud