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1/*
2 * Copyright (c) 2008-2011 Atheros Communications Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include <linux/kernel.h>
18#include "hw.h"
19#include "hw-ops.h"
20
21struct ani_ofdm_level_entry {
22 int spur_immunity_level;
23 int fir_step_level;
24 int ofdm_weak_signal_on;
25};
26
27/* values here are relative to the INI */
28
29/*
30 * Legend:
31 *
32 * SI: Spur immunity
33 * FS: FIR Step
34 * WS: OFDM / CCK Weak Signal detection
35 * MRC-CCK: Maximal Ratio Combining for CCK
36 */
37
38static const struct ani_ofdm_level_entry ofdm_level_table[] = {
39 /* SI FS WS */
40 { 0, 0, 1 }, /* lvl 0 */
41 { 1, 1, 1 }, /* lvl 1 */
42 { 2, 2, 1 }, /* lvl 2 */
43 { 3, 2, 1 }, /* lvl 3 (default) */
44 { 4, 3, 1 }, /* lvl 4 */
45 { 5, 4, 1 }, /* lvl 5 */
46 { 6, 5, 1 }, /* lvl 6 */
47 { 7, 6, 1 }, /* lvl 7 */
48 { 7, 7, 1 }, /* lvl 8 */
49 { 7, 8, 0 } /* lvl 9 */
50};
51#define ATH9K_ANI_OFDM_NUM_LEVEL \
52 ARRAY_SIZE(ofdm_level_table)
53#define ATH9K_ANI_OFDM_MAX_LEVEL \
54 (ATH9K_ANI_OFDM_NUM_LEVEL-1)
55#define ATH9K_ANI_OFDM_DEF_LEVEL \
56 3 /* default level - matches the INI settings */
57
58/*
59 * MRC (Maximal Ratio Combining) has always been used with multi-antenna ofdm.
60 * With OFDM for single stream you just add up all antenna inputs, you're
61 * only interested in what you get after FFT. Signal aligment is also not
62 * required for OFDM because any phase difference adds up in the frequency
63 * domain.
64 *
65 * MRC requires extra work for use with CCK. You need to align the antenna
66 * signals from the different antenna before you can add the signals together.
67 * You need aligment of signals as CCK is in time domain, so addition can cancel
68 * your signal completely if phase is 180 degrees (think of adding sine waves).
69 * You also need to remove noise before the addition and this is where ANI
70 * MRC CCK comes into play. One of the antenna inputs may be stronger but
71 * lower SNR, so just adding after alignment can be dangerous.
72 *
73 * Regardless of alignment in time, the antenna signals add constructively after
74 * FFT and improve your reception. For more information:
75 *
76 * http://en.wikipedia.org/wiki/Maximal-ratio_combining
77 */
78
79struct ani_cck_level_entry {
80 int fir_step_level;
81 int mrc_cck_on;
82};
83
84static const struct ani_cck_level_entry cck_level_table[] = {
85 /* FS MRC-CCK */
86 { 0, 1 }, /* lvl 0 */
87 { 1, 1 }, /* lvl 1 */
88 { 2, 1 }, /* lvl 2 (default) */
89 { 3, 1 }, /* lvl 3 */
90 { 4, 0 }, /* lvl 4 */
91 { 5, 0 }, /* lvl 5 */
92 { 6, 0 }, /* lvl 6 */
93 { 7, 0 }, /* lvl 7 (only for high rssi) */
94 { 8, 0 } /* lvl 8 (only for high rssi) */
95};
96
97#define ATH9K_ANI_CCK_NUM_LEVEL \
98 ARRAY_SIZE(cck_level_table)
99#define ATH9K_ANI_CCK_MAX_LEVEL \
100 (ATH9K_ANI_CCK_NUM_LEVEL-1)
101#define ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI \
102 (ATH9K_ANI_CCK_NUM_LEVEL-3)
103#define ATH9K_ANI_CCK_DEF_LEVEL \
104 2 /* default level - matches the INI settings */
105
106static bool use_new_ani(struct ath_hw *ah)
107{
108 return AR_SREV_9300_20_OR_LATER(ah) || modparam_force_new_ani;
109}
110
111static void ath9k_hw_update_mibstats(struct ath_hw *ah,
112 struct ath9k_mib_stats *stats)
113{
114 stats->ackrcv_bad += REG_READ(ah, AR_ACK_FAIL);
115 stats->rts_bad += REG_READ(ah, AR_RTS_FAIL);
116 stats->fcs_bad += REG_READ(ah, AR_FCS_FAIL);
117 stats->rts_good += REG_READ(ah, AR_RTS_OK);
118 stats->beacons += REG_READ(ah, AR_BEACON_CNT);
119}
120
121static void ath9k_ani_restart(struct ath_hw *ah)
122{
123 struct ar5416AniState *aniState;
124 struct ath_common *common = ath9k_hw_common(ah);
125 u32 ofdm_base = 0, cck_base = 0;
126
127 if (!DO_ANI(ah))
128 return;
129
130 aniState = &ah->curchan->ani;
131 aniState->listenTime = 0;
132
133 if (!use_new_ani(ah)) {
134 ofdm_base = AR_PHY_COUNTMAX - ah->config.ofdm_trig_high;
135 cck_base = AR_PHY_COUNTMAX - ah->config.cck_trig_high;
136 }
137
138 ath_dbg(common, ATH_DBG_ANI,
139 "Writing ofdmbase=%u cckbase=%u\n", ofdm_base, cck_base);
140
141 ENABLE_REGWRITE_BUFFER(ah);
142
143 REG_WRITE(ah, AR_PHY_ERR_1, ofdm_base);
144 REG_WRITE(ah, AR_PHY_ERR_2, cck_base);
145 REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
146 REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
147
148 REGWRITE_BUFFER_FLUSH(ah);
149
150 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
151
152 aniState->ofdmPhyErrCount = 0;
153 aniState->cckPhyErrCount = 0;
154}
155
156static void ath9k_hw_ani_ofdm_err_trigger_old(struct ath_hw *ah)
157{
158 struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
159 struct ar5416AniState *aniState;
160 int32_t rssi;
161
162 aniState = &ah->curchan->ani;
163
164 if (aniState->noiseImmunityLevel < HAL_NOISE_IMMUNE_MAX) {
165 if (ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
166 aniState->noiseImmunityLevel + 1)) {
167 return;
168 }
169 }
170
171 if (aniState->spurImmunityLevel < HAL_SPUR_IMMUNE_MAX) {
172 if (ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
173 aniState->spurImmunityLevel + 1)) {
174 return;
175 }
176 }
177
178 if (ah->opmode == NL80211_IFTYPE_AP) {
179 if (aniState->firstepLevel < HAL_FIRST_STEP_MAX) {
180 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
181 aniState->firstepLevel + 1);
182 }
183 return;
184 }
185 rssi = BEACON_RSSI(ah);
186 if (rssi > aniState->rssiThrHigh) {
187 if (!aniState->ofdmWeakSigDetectOff) {
188 if (ath9k_hw_ani_control(ah,
189 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
190 false)) {
191 ath9k_hw_ani_control(ah,
192 ATH9K_ANI_SPUR_IMMUNITY_LEVEL, 0);
193 return;
194 }
195 }
196 if (aniState->firstepLevel < HAL_FIRST_STEP_MAX) {
197 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
198 aniState->firstepLevel + 1);
199 return;
200 }
201 } else if (rssi > aniState->rssiThrLow) {
202 if (aniState->ofdmWeakSigDetectOff)
203 ath9k_hw_ani_control(ah,
204 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
205 true);
206 if (aniState->firstepLevel < HAL_FIRST_STEP_MAX)
207 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
208 aniState->firstepLevel + 1);
209 return;
210 } else {
211 if ((conf->channel->band == IEEE80211_BAND_2GHZ) &&
212 !conf_is_ht(conf)) {
213 if (!aniState->ofdmWeakSigDetectOff)
214 ath9k_hw_ani_control(ah,
215 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
216 false);
217 if (aniState->firstepLevel > 0)
218 ath9k_hw_ani_control(ah,
219 ATH9K_ANI_FIRSTEP_LEVEL, 0);
220 return;
221 }
222 }
223}
224
225static void ath9k_hw_ani_cck_err_trigger_old(struct ath_hw *ah)
226{
227 struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
228 struct ar5416AniState *aniState;
229 int32_t rssi;
230
231 aniState = &ah->curchan->ani;
232 if (aniState->noiseImmunityLevel < HAL_NOISE_IMMUNE_MAX) {
233 if (ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
234 aniState->noiseImmunityLevel + 1)) {
235 return;
236 }
237 }
238 if (ah->opmode == NL80211_IFTYPE_AP) {
239 if (aniState->firstepLevel < HAL_FIRST_STEP_MAX) {
240 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
241 aniState->firstepLevel + 1);
242 }
243 return;
244 }
245 rssi = BEACON_RSSI(ah);
246 if (rssi > aniState->rssiThrLow) {
247 if (aniState->firstepLevel < HAL_FIRST_STEP_MAX)
248 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
249 aniState->firstepLevel + 1);
250 } else {
251 if ((conf->channel->band == IEEE80211_BAND_2GHZ) &&
252 !conf_is_ht(conf)) {
253 if (aniState->firstepLevel > 0)
254 ath9k_hw_ani_control(ah,
255 ATH9K_ANI_FIRSTEP_LEVEL, 0);
256 }
257 }
258}
259
260/* Adjust the OFDM Noise Immunity Level */
261static void ath9k_hw_set_ofdm_nil(struct ath_hw *ah, u8 immunityLevel)
262{
263 struct ar5416AniState *aniState = &ah->curchan->ani;
264 struct ath_common *common = ath9k_hw_common(ah);
265 const struct ani_ofdm_level_entry *entry_ofdm;
266 const struct ani_cck_level_entry *entry_cck;
267
268 aniState->noiseFloor = BEACON_RSSI(ah);
269
270 ath_dbg(common, ATH_DBG_ANI,
271 "**** ofdmlevel %d=>%d, rssi=%d[lo=%d hi=%d]\n",
272 aniState->ofdmNoiseImmunityLevel,
273 immunityLevel, aniState->noiseFloor,
274 aniState->rssiThrLow, aniState->rssiThrHigh);
275
276 aniState->ofdmNoiseImmunityLevel = immunityLevel;
277
278 entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
279 entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
280
281 if (aniState->spurImmunityLevel != entry_ofdm->spur_immunity_level)
282 ath9k_hw_ani_control(ah,
283 ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
284 entry_ofdm->spur_immunity_level);
285
286 if (aniState->firstepLevel != entry_ofdm->fir_step_level &&
287 entry_ofdm->fir_step_level >= entry_cck->fir_step_level)
288 ath9k_hw_ani_control(ah,
289 ATH9K_ANI_FIRSTEP_LEVEL,
290 entry_ofdm->fir_step_level);
291
292 if ((ah->opmode != NL80211_IFTYPE_STATION &&
293 ah->opmode != NL80211_IFTYPE_ADHOC) ||
294 aniState->noiseFloor <= aniState->rssiThrHigh) {
295 if (aniState->ofdmWeakSigDetectOff)
296 /* force on ofdm weak sig detect */
297 ath9k_hw_ani_control(ah,
298 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
299 true);
300 else if (aniState->ofdmWeakSigDetectOff ==
301 entry_ofdm->ofdm_weak_signal_on)
302 ath9k_hw_ani_control(ah,
303 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
304 entry_ofdm->ofdm_weak_signal_on);
305 }
306}
307
308static void ath9k_hw_ani_ofdm_err_trigger(struct ath_hw *ah)
309{
310 struct ar5416AniState *aniState;
311
312 if (!DO_ANI(ah))
313 return;
314
315 if (!use_new_ani(ah)) {
316 ath9k_hw_ani_ofdm_err_trigger_old(ah);
317 return;
318 }
319
320 aniState = &ah->curchan->ani;
321
322 if (aniState->ofdmNoiseImmunityLevel < ATH9K_ANI_OFDM_MAX_LEVEL)
323 ath9k_hw_set_ofdm_nil(ah, aniState->ofdmNoiseImmunityLevel + 1);
324}
325
326/*
327 * Set the ANI settings to match an CCK level.
328 */
329static void ath9k_hw_set_cck_nil(struct ath_hw *ah, u_int8_t immunityLevel)
330{
331 struct ar5416AniState *aniState = &ah->curchan->ani;
332 struct ath_common *common = ath9k_hw_common(ah);
333 const struct ani_ofdm_level_entry *entry_ofdm;
334 const struct ani_cck_level_entry *entry_cck;
335
336 aniState->noiseFloor = BEACON_RSSI(ah);
337 ath_dbg(common, ATH_DBG_ANI,
338 "**** ccklevel %d=>%d, rssi=%d[lo=%d hi=%d]\n",
339 aniState->cckNoiseImmunityLevel, immunityLevel,
340 aniState->noiseFloor, aniState->rssiThrLow,
341 aniState->rssiThrHigh);
342
343 if ((ah->opmode == NL80211_IFTYPE_STATION ||
344 ah->opmode == NL80211_IFTYPE_ADHOC) &&
345 aniState->noiseFloor <= aniState->rssiThrLow &&
346 immunityLevel > ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI)
347 immunityLevel = ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI;
348
349 aniState->cckNoiseImmunityLevel = immunityLevel;
350
351 entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
352 entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
353
354 if (aniState->firstepLevel != entry_cck->fir_step_level &&
355 entry_cck->fir_step_level >= entry_ofdm->fir_step_level)
356 ath9k_hw_ani_control(ah,
357 ATH9K_ANI_FIRSTEP_LEVEL,
358 entry_cck->fir_step_level);
359
360 /* Skip MRC CCK for pre AR9003 families */
361 if (!AR_SREV_9300_20_OR_LATER(ah) || AR_SREV_9485(ah))
362 return;
363
364 if (aniState->mrcCCKOff == entry_cck->mrc_cck_on)
365 ath9k_hw_ani_control(ah,
366 ATH9K_ANI_MRC_CCK,
367 entry_cck->mrc_cck_on);
368}
369
370static void ath9k_hw_ani_cck_err_trigger(struct ath_hw *ah)
371{
372 struct ar5416AniState *aniState;
373
374 if (!DO_ANI(ah))
375 return;
376
377 if (!use_new_ani(ah)) {
378 ath9k_hw_ani_cck_err_trigger_old(ah);
379 return;
380 }
381
382 aniState = &ah->curchan->ani;
383
384 if (aniState->cckNoiseImmunityLevel < ATH9K_ANI_CCK_MAX_LEVEL)
385 ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel + 1);
386}
387
388static void ath9k_hw_ani_lower_immunity_old(struct ath_hw *ah)
389{
390 struct ar5416AniState *aniState;
391 int32_t rssi;
392
393 aniState = &ah->curchan->ani;
394
395 if (ah->opmode == NL80211_IFTYPE_AP) {
396 if (aniState->firstepLevel > 0) {
397 if (ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
398 aniState->firstepLevel - 1))
399 return;
400 }
401 } else {
402 rssi = BEACON_RSSI(ah);
403 if (rssi > aniState->rssiThrHigh) {
404 /* XXX: Handle me */
405 } else if (rssi > aniState->rssiThrLow) {
406 if (aniState->ofdmWeakSigDetectOff) {
407 if (ath9k_hw_ani_control(ah,
408 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
409 true) == true)
410 return;
411 }
412 if (aniState->firstepLevel > 0) {
413 if (ath9k_hw_ani_control(ah,
414 ATH9K_ANI_FIRSTEP_LEVEL,
415 aniState->firstepLevel - 1) == true)
416 return;
417 }
418 } else {
419 if (aniState->firstepLevel > 0) {
420 if (ath9k_hw_ani_control(ah,
421 ATH9K_ANI_FIRSTEP_LEVEL,
422 aniState->firstepLevel - 1) == true)
423 return;
424 }
425 }
426 }
427
428 if (aniState->spurImmunityLevel > 0) {
429 if (ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
430 aniState->spurImmunityLevel - 1))
431 return;
432 }
433
434 if (aniState->noiseImmunityLevel > 0) {
435 ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
436 aniState->noiseImmunityLevel - 1);
437 return;
438 }
439}
440
441/*
442 * only lower either OFDM or CCK errors per turn
443 * we lower the other one next time
444 */
445static void ath9k_hw_ani_lower_immunity(struct ath_hw *ah)
446{
447 struct ar5416AniState *aniState;
448
449 aniState = &ah->curchan->ani;
450
451 if (!use_new_ani(ah)) {
452 ath9k_hw_ani_lower_immunity_old(ah);
453 return;
454 }
455
456 /* lower OFDM noise immunity */
457 if (aniState->ofdmNoiseImmunityLevel > 0 &&
458 (aniState->ofdmsTurn || aniState->cckNoiseImmunityLevel == 0)) {
459 ath9k_hw_set_ofdm_nil(ah, aniState->ofdmNoiseImmunityLevel - 1);
460 return;
461 }
462
463 /* lower CCK noise immunity */
464 if (aniState->cckNoiseImmunityLevel > 0)
465 ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel - 1);
466}
467
468static void ath9k_ani_reset_old(struct ath_hw *ah, bool is_scanning)
469{
470 struct ar5416AniState *aniState;
471 struct ath9k_channel *chan = ah->curchan;
472 struct ath_common *common = ath9k_hw_common(ah);
473
474 if (!DO_ANI(ah))
475 return;
476
477 aniState = &ah->curchan->ani;
478
479 if (ah->opmode != NL80211_IFTYPE_STATION
480 && ah->opmode != NL80211_IFTYPE_ADHOC) {
481 ath_dbg(common, ATH_DBG_ANI,
482 "Reset ANI state opmode %u\n", ah->opmode);
483 ah->stats.ast_ani_reset++;
484
485 if (ah->opmode == NL80211_IFTYPE_AP) {
486 /*
487 * ath9k_hw_ani_control() will only process items set on
488 * ah->ani_function
489 */
490 if (IS_CHAN_2GHZ(chan))
491 ah->ani_function = (ATH9K_ANI_SPUR_IMMUNITY_LEVEL |
492 ATH9K_ANI_FIRSTEP_LEVEL);
493 else
494 ah->ani_function = 0;
495 }
496
497 ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL, 0);
498 ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL, 0);
499 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL, 0);
500 ath9k_hw_ani_control(ah, ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
501 !ATH9K_ANI_USE_OFDM_WEAK_SIG);
502 ath9k_hw_ani_control(ah, ATH9K_ANI_CCK_WEAK_SIGNAL_THR,
503 ATH9K_ANI_CCK_WEAK_SIG_THR);
504
505 ath9k_hw_setrxfilter(ah, ath9k_hw_getrxfilter(ah) |
506 ATH9K_RX_FILTER_PHYERR);
507
508 ath9k_ani_restart(ah);
509 return;
510 }
511
512 if (aniState->noiseImmunityLevel != 0)
513 ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
514 aniState->noiseImmunityLevel);
515 if (aniState->spurImmunityLevel != 0)
516 ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
517 aniState->spurImmunityLevel);
518 if (aniState->ofdmWeakSigDetectOff)
519 ath9k_hw_ani_control(ah, ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
520 !aniState->ofdmWeakSigDetectOff);
521 if (aniState->cckWeakSigThreshold)
522 ath9k_hw_ani_control(ah, ATH9K_ANI_CCK_WEAK_SIGNAL_THR,
523 aniState->cckWeakSigThreshold);
524 if (aniState->firstepLevel != 0)
525 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
526 aniState->firstepLevel);
527
528 ath9k_hw_setrxfilter(ah, ath9k_hw_getrxfilter(ah) &
529 ~ATH9K_RX_FILTER_PHYERR);
530 ath9k_ani_restart(ah);
531
532 ENABLE_REGWRITE_BUFFER(ah);
533
534 REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
535 REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
536
537 REGWRITE_BUFFER_FLUSH(ah);
538}
539
540/*
541 * Restore the ANI parameters in the HAL and reset the statistics.
542 * This routine should be called for every hardware reset and for
543 * every channel change.
544 */
545void ath9k_ani_reset(struct ath_hw *ah, bool is_scanning)
546{
547 struct ar5416AniState *aniState = &ah->curchan->ani;
548 struct ath9k_channel *chan = ah->curchan;
549 struct ath_common *common = ath9k_hw_common(ah);
550
551 if (!DO_ANI(ah))
552 return;
553
554 if (!use_new_ani(ah))
555 return ath9k_ani_reset_old(ah, is_scanning);
556
557 BUG_ON(aniState == NULL);
558 ah->stats.ast_ani_reset++;
559
560 /* only allow a subset of functions in AP mode */
561 if (ah->opmode == NL80211_IFTYPE_AP) {
562 if (IS_CHAN_2GHZ(chan)) {
563 ah->ani_function = (ATH9K_ANI_SPUR_IMMUNITY_LEVEL |
564 ATH9K_ANI_FIRSTEP_LEVEL);
565 if (AR_SREV_9300_20_OR_LATER(ah))
566 ah->ani_function |= ATH9K_ANI_MRC_CCK;
567 } else
568 ah->ani_function = 0;
569 }
570
571 /* always allow mode (on/off) to be controlled */
572 ah->ani_function |= ATH9K_ANI_MODE;
573
574 if (is_scanning ||
575 (ah->opmode != NL80211_IFTYPE_STATION &&
576 ah->opmode != NL80211_IFTYPE_ADHOC)) {
577 /*
578 * If we're scanning or in AP mode, the defaults (ini)
579 * should be in place. For an AP we assume the historical
580 * levels for this channel are probably outdated so start
581 * from defaults instead.
582 */
583 if (aniState->ofdmNoiseImmunityLevel !=
584 ATH9K_ANI_OFDM_DEF_LEVEL ||
585 aniState->cckNoiseImmunityLevel !=
586 ATH9K_ANI_CCK_DEF_LEVEL) {
587 ath_dbg(common, ATH_DBG_ANI,
588 "Restore defaults: opmode %u chan %d Mhz/0x%x is_scanning=%d ofdm:%d cck:%d\n",
589 ah->opmode,
590 chan->channel,
591 chan->channelFlags,
592 is_scanning,
593 aniState->ofdmNoiseImmunityLevel,
594 aniState->cckNoiseImmunityLevel);
595
596 ath9k_hw_set_ofdm_nil(ah, ATH9K_ANI_OFDM_DEF_LEVEL);
597 ath9k_hw_set_cck_nil(ah, ATH9K_ANI_CCK_DEF_LEVEL);
598 }
599 } else {
600 /*
601 * restore historical levels for this channel
602 */
603 ath_dbg(common, ATH_DBG_ANI,
604 "Restore history: opmode %u chan %d Mhz/0x%x is_scanning=%d ofdm:%d cck:%d\n",
605 ah->opmode,
606 chan->channel,
607 chan->channelFlags,
608 is_scanning,
609 aniState->ofdmNoiseImmunityLevel,
610 aniState->cckNoiseImmunityLevel);
611
612 ath9k_hw_set_ofdm_nil(ah,
613 aniState->ofdmNoiseImmunityLevel);
614 ath9k_hw_set_cck_nil(ah,
615 aniState->cckNoiseImmunityLevel);
616 }
617
618 /*
619 * enable phy counters if hw supports or if not, enable phy
620 * interrupts (so we can count each one)
621 */
622 ath9k_ani_restart(ah);
623
624 ENABLE_REGWRITE_BUFFER(ah);
625
626 REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
627 REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
628
629 REGWRITE_BUFFER_FLUSH(ah);
630}
631
632static bool ath9k_hw_ani_read_counters(struct ath_hw *ah)
633{
634 struct ath_common *common = ath9k_hw_common(ah);
635 struct ar5416AniState *aniState = &ah->curchan->ani;
636 u32 ofdm_base = 0;
637 u32 cck_base = 0;
638 u32 ofdmPhyErrCnt, cckPhyErrCnt;
639 u32 phyCnt1, phyCnt2;
640 int32_t listenTime;
641
642 ath_hw_cycle_counters_update(common);
643 listenTime = ath_hw_get_listen_time(common);
644
645 if (listenTime <= 0) {
646 ah->stats.ast_ani_lneg++;
647 ath9k_ani_restart(ah);
648 return false;
649 }
650
651 if (!use_new_ani(ah)) {
652 ofdm_base = AR_PHY_COUNTMAX - ah->config.ofdm_trig_high;
653 cck_base = AR_PHY_COUNTMAX - ah->config.cck_trig_high;
654 }
655
656 aniState->listenTime += listenTime;
657
658 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
659
660 phyCnt1 = REG_READ(ah, AR_PHY_ERR_1);
661 phyCnt2 = REG_READ(ah, AR_PHY_ERR_2);
662
663 if (!use_new_ani(ah) && (phyCnt1 < ofdm_base || phyCnt2 < cck_base)) {
664 if (phyCnt1 < ofdm_base) {
665 ath_dbg(common, ATH_DBG_ANI,
666 "phyCnt1 0x%x, resetting counter value to 0x%x\n",
667 phyCnt1, ofdm_base);
668 REG_WRITE(ah, AR_PHY_ERR_1, ofdm_base);
669 REG_WRITE(ah, AR_PHY_ERR_MASK_1,
670 AR_PHY_ERR_OFDM_TIMING);
671 }
672 if (phyCnt2 < cck_base) {
673 ath_dbg(common, ATH_DBG_ANI,
674 "phyCnt2 0x%x, resetting counter value to 0x%x\n",
675 phyCnt2, cck_base);
676 REG_WRITE(ah, AR_PHY_ERR_2, cck_base);
677 REG_WRITE(ah, AR_PHY_ERR_MASK_2,
678 AR_PHY_ERR_CCK_TIMING);
679 }
680 return false;
681 }
682
683 ofdmPhyErrCnt = phyCnt1 - ofdm_base;
684 ah->stats.ast_ani_ofdmerrs +=
685 ofdmPhyErrCnt - aniState->ofdmPhyErrCount;
686 aniState->ofdmPhyErrCount = ofdmPhyErrCnt;
687
688 cckPhyErrCnt = phyCnt2 - cck_base;
689 ah->stats.ast_ani_cckerrs +=
690 cckPhyErrCnt - aniState->cckPhyErrCount;
691 aniState->cckPhyErrCount = cckPhyErrCnt;
692 return true;
693}
694
695void ath9k_hw_ani_monitor(struct ath_hw *ah, struct ath9k_channel *chan)
696{
697 struct ar5416AniState *aniState;
698 struct ath_common *common = ath9k_hw_common(ah);
699 u32 ofdmPhyErrRate, cckPhyErrRate;
700
701 if (!DO_ANI(ah))
702 return;
703
704 aniState = &ah->curchan->ani;
705 if (WARN_ON(!aniState))
706 return;
707
708 if (!ath9k_hw_ani_read_counters(ah))
709 return;
710
711 ofdmPhyErrRate = aniState->ofdmPhyErrCount * 1000 /
712 aniState->listenTime;
713 cckPhyErrRate = aniState->cckPhyErrCount * 1000 /
714 aniState->listenTime;
715
716 ath_dbg(common, ATH_DBG_ANI,
717 "listenTime=%d OFDM:%d errs=%d/s CCK:%d errs=%d/s ofdm_turn=%d\n",
718 aniState->listenTime,
719 aniState->ofdmNoiseImmunityLevel,
720 ofdmPhyErrRate, aniState->cckNoiseImmunityLevel,
721 cckPhyErrRate, aniState->ofdmsTurn);
722
723 if (aniState->listenTime > 5 * ah->aniperiod) {
724 if (ofdmPhyErrRate <= ah->config.ofdm_trig_low &&
725 cckPhyErrRate <= ah->config.cck_trig_low) {
726 ath9k_hw_ani_lower_immunity(ah);
727 aniState->ofdmsTurn = !aniState->ofdmsTurn;
728 }
729 ath9k_ani_restart(ah);
730 } else if (aniState->listenTime > ah->aniperiod) {
731 /* check to see if need to raise immunity */
732 if (ofdmPhyErrRate > ah->config.ofdm_trig_high &&
733 (cckPhyErrRate <= ah->config.cck_trig_high ||
734 aniState->ofdmsTurn)) {
735 ath9k_hw_ani_ofdm_err_trigger(ah);
736 ath9k_ani_restart(ah);
737 aniState->ofdmsTurn = false;
738 } else if (cckPhyErrRate > ah->config.cck_trig_high) {
739 ath9k_hw_ani_cck_err_trigger(ah);
740 ath9k_ani_restart(ah);
741 aniState->ofdmsTurn = true;
742 }
743 }
744}
745EXPORT_SYMBOL(ath9k_hw_ani_monitor);
746
747void ath9k_enable_mib_counters(struct ath_hw *ah)
748{
749 struct ath_common *common = ath9k_hw_common(ah);
750
751 ath_dbg(common, ATH_DBG_ANI, "Enable MIB counters\n");
752
753 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
754
755 ENABLE_REGWRITE_BUFFER(ah);
756
757 REG_WRITE(ah, AR_FILT_OFDM, 0);
758 REG_WRITE(ah, AR_FILT_CCK, 0);
759 REG_WRITE(ah, AR_MIBC,
760 ~(AR_MIBC_COW | AR_MIBC_FMC | AR_MIBC_CMC | AR_MIBC_MCS)
761 & 0x0f);
762 REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
763 REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
764
765 REGWRITE_BUFFER_FLUSH(ah);
766}
767
768/* Freeze the MIB counters, get the stats and then clear them */
769void ath9k_hw_disable_mib_counters(struct ath_hw *ah)
770{
771 struct ath_common *common = ath9k_hw_common(ah);
772
773 ath_dbg(common, ATH_DBG_ANI, "Disable MIB counters\n");
774
775 REG_WRITE(ah, AR_MIBC, AR_MIBC_FMC);
776 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
777 REG_WRITE(ah, AR_MIBC, AR_MIBC_CMC);
778 REG_WRITE(ah, AR_FILT_OFDM, 0);
779 REG_WRITE(ah, AR_FILT_CCK, 0);
780}
781EXPORT_SYMBOL(ath9k_hw_disable_mib_counters);
782
783/*
784 * Process a MIB interrupt. We may potentially be invoked because
785 * any of the MIB counters overflow/trigger so don't assume we're
786 * here because a PHY error counter triggered.
787 */
788void ath9k_hw_proc_mib_event(struct ath_hw *ah)
789{
790 u32 phyCnt1, phyCnt2;
791
792 /* Reset these counters regardless */
793 REG_WRITE(ah, AR_FILT_OFDM, 0);
794 REG_WRITE(ah, AR_FILT_CCK, 0);
795 if (!(REG_READ(ah, AR_SLP_MIB_CTRL) & AR_SLP_MIB_PENDING))
796 REG_WRITE(ah, AR_SLP_MIB_CTRL, AR_SLP_MIB_CLEAR);
797
798 /* Clear the mib counters and save them in the stats */
799 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
800
801 if (!DO_ANI(ah)) {
802 /*
803 * We must always clear the interrupt cause by
804 * resetting the phy error regs.
805 */
806 REG_WRITE(ah, AR_PHY_ERR_1, 0);
807 REG_WRITE(ah, AR_PHY_ERR_2, 0);
808 return;
809 }
810
811 /* NB: these are not reset-on-read */
812 phyCnt1 = REG_READ(ah, AR_PHY_ERR_1);
813 phyCnt2 = REG_READ(ah, AR_PHY_ERR_2);
814 if (((phyCnt1 & AR_MIBCNT_INTRMASK) == AR_MIBCNT_INTRMASK) ||
815 ((phyCnt2 & AR_MIBCNT_INTRMASK) == AR_MIBCNT_INTRMASK)) {
816
817 if (!use_new_ani(ah))
818 ath9k_hw_ani_read_counters(ah);
819
820 /* NB: always restart to insure the h/w counters are reset */
821 ath9k_ani_restart(ah);
822 }
823}
824EXPORT_SYMBOL(ath9k_hw_proc_mib_event);
825
826void ath9k_hw_ani_setup(struct ath_hw *ah)
827{
828 int i;
829
830 static const int totalSizeDesired[] = { -55, -55, -55, -55, -62 };
831 static const int coarseHigh[] = { -14, -14, -14, -14, -12 };
832 static const int coarseLow[] = { -64, -64, -64, -64, -70 };
833 static const int firpwr[] = { -78, -78, -78, -78, -80 };
834
835 for (i = 0; i < 5; i++) {
836 ah->totalSizeDesired[i] = totalSizeDesired[i];
837 ah->coarse_high[i] = coarseHigh[i];
838 ah->coarse_low[i] = coarseLow[i];
839 ah->firpwr[i] = firpwr[i];
840 }
841}
842
843void ath9k_hw_ani_init(struct ath_hw *ah)
844{
845 struct ath_common *common = ath9k_hw_common(ah);
846 int i;
847
848 ath_dbg(common, ATH_DBG_ANI, "Initialize ANI\n");
849
850 if (use_new_ani(ah)) {
851 ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_NEW;
852 ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_NEW;
853
854 ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH_NEW;
855 ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW_NEW;
856 } else {
857 ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_OLD;
858 ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_OLD;
859
860 ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH_OLD;
861 ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW_OLD;
862 }
863
864 for (i = 0; i < ARRAY_SIZE(ah->channels); i++) {
865 struct ath9k_channel *chan = &ah->channels[i];
866 struct ar5416AniState *ani = &chan->ani;
867
868 if (use_new_ani(ah)) {
869 ani->spurImmunityLevel =
870 ATH9K_ANI_SPUR_IMMUNE_LVL_NEW;
871
872 ani->firstepLevel = ATH9K_ANI_FIRSTEP_LVL_NEW;
873
874 if (AR_SREV_9300_20_OR_LATER(ah))
875 ani->mrcCCKOff =
876 !ATH9K_ANI_ENABLE_MRC_CCK;
877 else
878 ani->mrcCCKOff = true;
879
880 ani->ofdmsTurn = true;
881 } else {
882 ani->spurImmunityLevel =
883 ATH9K_ANI_SPUR_IMMUNE_LVL_OLD;
884 ani->firstepLevel = ATH9K_ANI_FIRSTEP_LVL_OLD;
885
886 ani->cckWeakSigThreshold =
887 ATH9K_ANI_CCK_WEAK_SIG_THR;
888 }
889
890 ani->rssiThrHigh = ATH9K_ANI_RSSI_THR_HIGH;
891 ani->rssiThrLow = ATH9K_ANI_RSSI_THR_LOW;
892 ani->ofdmWeakSigDetectOff =
893 !ATH9K_ANI_USE_OFDM_WEAK_SIG;
894 ani->cckNoiseImmunityLevel = ATH9K_ANI_CCK_DEF_LEVEL;
895 }
896
897 /*
898 * since we expect some ongoing maintenance on the tables, let's sanity
899 * check here default level should not modify INI setting.
900 */
901 if (use_new_ani(ah)) {
902 ah->aniperiod = ATH9K_ANI_PERIOD_NEW;
903 ah->config.ani_poll_interval = ATH9K_ANI_POLLINTERVAL_NEW;
904 } else {
905 ah->aniperiod = ATH9K_ANI_PERIOD_OLD;
906 ah->config.ani_poll_interval = ATH9K_ANI_POLLINTERVAL_OLD;
907 }
908
909 if (ah->config.enable_ani)
910 ah->proc_phyerr |= HAL_PROCESS_ANI;
911
912 ath9k_ani_restart(ah);
913 ath9k_enable_mib_counters(ah);
914}
1/*
2 * Copyright (c) 2008-2011 Atheros Communications Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include <linux/kernel.h>
18#include <linux/export.h>
19#include "hw.h"
20#include "hw-ops.h"
21
22struct ani_ofdm_level_entry {
23 int spur_immunity_level;
24 int fir_step_level;
25 int ofdm_weak_signal_on;
26};
27
28/* values here are relative to the INI */
29
30/*
31 * Legend:
32 *
33 * SI: Spur immunity
34 * FS: FIR Step
35 * WS: OFDM / CCK Weak Signal detection
36 * MRC-CCK: Maximal Ratio Combining for CCK
37 */
38
39static const struct ani_ofdm_level_entry ofdm_level_table[] = {
40 /* SI FS WS */
41 { 0, 0, 1 }, /* lvl 0 */
42 { 1, 1, 1 }, /* lvl 1 */
43 { 2, 2, 1 }, /* lvl 2 */
44 { 3, 2, 1 }, /* lvl 3 (default) */
45 { 4, 3, 1 }, /* lvl 4 */
46 { 5, 4, 1 }, /* lvl 5 */
47 { 6, 5, 1 }, /* lvl 6 */
48 { 7, 6, 1 }, /* lvl 7 */
49 { 7, 7, 1 }, /* lvl 8 */
50 { 7, 8, 0 } /* lvl 9 */
51};
52#define ATH9K_ANI_OFDM_NUM_LEVEL \
53 ARRAY_SIZE(ofdm_level_table)
54#define ATH9K_ANI_OFDM_MAX_LEVEL \
55 (ATH9K_ANI_OFDM_NUM_LEVEL-1)
56#define ATH9K_ANI_OFDM_DEF_LEVEL \
57 3 /* default level - matches the INI settings */
58
59/*
60 * MRC (Maximal Ratio Combining) has always been used with multi-antenna ofdm.
61 * With OFDM for single stream you just add up all antenna inputs, you're
62 * only interested in what you get after FFT. Signal aligment is also not
63 * required for OFDM because any phase difference adds up in the frequency
64 * domain.
65 *
66 * MRC requires extra work for use with CCK. You need to align the antenna
67 * signals from the different antenna before you can add the signals together.
68 * You need aligment of signals as CCK is in time domain, so addition can cancel
69 * your signal completely if phase is 180 degrees (think of adding sine waves).
70 * You also need to remove noise before the addition and this is where ANI
71 * MRC CCK comes into play. One of the antenna inputs may be stronger but
72 * lower SNR, so just adding after alignment can be dangerous.
73 *
74 * Regardless of alignment in time, the antenna signals add constructively after
75 * FFT and improve your reception. For more information:
76 *
77 * http://en.wikipedia.org/wiki/Maximal-ratio_combining
78 */
79
80struct ani_cck_level_entry {
81 int fir_step_level;
82 int mrc_cck_on;
83};
84
85static const struct ani_cck_level_entry cck_level_table[] = {
86 /* FS MRC-CCK */
87 { 0, 1 }, /* lvl 0 */
88 { 1, 1 }, /* lvl 1 */
89 { 2, 1 }, /* lvl 2 (default) */
90 { 3, 1 }, /* lvl 3 */
91 { 4, 0 }, /* lvl 4 */
92 { 5, 0 }, /* lvl 5 */
93 { 6, 0 }, /* lvl 6 */
94 { 7, 0 }, /* lvl 7 (only for high rssi) */
95 { 8, 0 } /* lvl 8 (only for high rssi) */
96};
97
98#define ATH9K_ANI_CCK_NUM_LEVEL \
99 ARRAY_SIZE(cck_level_table)
100#define ATH9K_ANI_CCK_MAX_LEVEL \
101 (ATH9K_ANI_CCK_NUM_LEVEL-1)
102#define ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI \
103 (ATH9K_ANI_CCK_NUM_LEVEL-3)
104#define ATH9K_ANI_CCK_DEF_LEVEL \
105 2 /* default level - matches the INI settings */
106
107static void ath9k_hw_update_mibstats(struct ath_hw *ah,
108 struct ath9k_mib_stats *stats)
109{
110 stats->ackrcv_bad += REG_READ(ah, AR_ACK_FAIL);
111 stats->rts_bad += REG_READ(ah, AR_RTS_FAIL);
112 stats->fcs_bad += REG_READ(ah, AR_FCS_FAIL);
113 stats->rts_good += REG_READ(ah, AR_RTS_OK);
114 stats->beacons += REG_READ(ah, AR_BEACON_CNT);
115}
116
117static void ath9k_ani_restart(struct ath_hw *ah)
118{
119 struct ar5416AniState *aniState;
120
121 if (!ah->curchan)
122 return;
123
124 aniState = &ah->ani;
125 aniState->listenTime = 0;
126
127 ENABLE_REGWRITE_BUFFER(ah);
128
129 REG_WRITE(ah, AR_PHY_ERR_1, 0);
130 REG_WRITE(ah, AR_PHY_ERR_2, 0);
131 REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
132 REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
133
134 REGWRITE_BUFFER_FLUSH(ah);
135
136 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
137
138 aniState->ofdmPhyErrCount = 0;
139 aniState->cckPhyErrCount = 0;
140}
141
142/* Adjust the OFDM Noise Immunity Level */
143static void ath9k_hw_set_ofdm_nil(struct ath_hw *ah, u8 immunityLevel,
144 bool scan)
145{
146 struct ar5416AniState *aniState = &ah->ani;
147 struct ath_common *common = ath9k_hw_common(ah);
148 const struct ani_ofdm_level_entry *entry_ofdm;
149 const struct ani_cck_level_entry *entry_cck;
150 bool weak_sig;
151
152 ath_dbg(common, ANI, "**** ofdmlevel %d=>%d, rssi=%d[lo=%d hi=%d]\n",
153 aniState->ofdmNoiseImmunityLevel,
154 immunityLevel, BEACON_RSSI(ah),
155 ATH9K_ANI_RSSI_THR_LOW,
156 ATH9K_ANI_RSSI_THR_HIGH);
157
158 if (AR_SREV_9100(ah) && immunityLevel < ATH9K_ANI_OFDM_DEF_LEVEL)
159 immunityLevel = ATH9K_ANI_OFDM_DEF_LEVEL;
160
161 if (!scan)
162 aniState->ofdmNoiseImmunityLevel = immunityLevel;
163
164 entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
165 entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
166
167 if (aniState->spurImmunityLevel != entry_ofdm->spur_immunity_level)
168 ath9k_hw_ani_control(ah,
169 ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
170 entry_ofdm->spur_immunity_level);
171
172 if (aniState->firstepLevel != entry_ofdm->fir_step_level &&
173 entry_ofdm->fir_step_level >= entry_cck->fir_step_level)
174 ath9k_hw_ani_control(ah,
175 ATH9K_ANI_FIRSTEP_LEVEL,
176 entry_ofdm->fir_step_level);
177
178 weak_sig = entry_ofdm->ofdm_weak_signal_on;
179 if (ah->opmode == NL80211_IFTYPE_STATION &&
180 BEACON_RSSI(ah) <= ATH9K_ANI_RSSI_THR_HIGH)
181 weak_sig = true;
182 /*
183 * Newer chipsets are better at dealing with high PHY error counts -
184 * keep weak signal detection enabled when no RSSI threshold is
185 * available to determine if it is needed (mode != STA)
186 */
187 else if (AR_SREV_9300_20_OR_LATER(ah) &&
188 ah->opmode != NL80211_IFTYPE_STATION)
189 weak_sig = true;
190
191 /* Older chipsets are more sensitive to high PHY error counts */
192 else if (!AR_SREV_9300_20_OR_LATER(ah) &&
193 aniState->ofdmNoiseImmunityLevel >= 8)
194 weak_sig = false;
195
196 if (aniState->ofdmWeakSigDetect != weak_sig)
197 ath9k_hw_ani_control(ah, ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
198 weak_sig);
199
200 if (!AR_SREV_9300_20_OR_LATER(ah))
201 return;
202
203 if (aniState->ofdmNoiseImmunityLevel >= ATH9K_ANI_OFDM_DEF_LEVEL) {
204 ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH;
205 ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_ABOVE_INI;
206 } else {
207 ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_BELOW_INI;
208 ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW;
209 }
210}
211
212static void ath9k_hw_ani_ofdm_err_trigger(struct ath_hw *ah)
213{
214 struct ar5416AniState *aniState;
215
216 if (!ah->curchan)
217 return;
218
219 aniState = &ah->ani;
220
221 if (aniState->ofdmNoiseImmunityLevel < ATH9K_ANI_OFDM_MAX_LEVEL)
222 ath9k_hw_set_ofdm_nil(ah, aniState->ofdmNoiseImmunityLevel + 1, false);
223}
224
225/*
226 * Set the ANI settings to match an CCK level.
227 */
228static void ath9k_hw_set_cck_nil(struct ath_hw *ah, u_int8_t immunityLevel,
229 bool scan)
230{
231 struct ar5416AniState *aniState = &ah->ani;
232 struct ath_common *common = ath9k_hw_common(ah);
233 const struct ani_ofdm_level_entry *entry_ofdm;
234 const struct ani_cck_level_entry *entry_cck;
235
236 ath_dbg(common, ANI, "**** ccklevel %d=>%d, rssi=%d[lo=%d hi=%d]\n",
237 aniState->cckNoiseImmunityLevel, immunityLevel,
238 BEACON_RSSI(ah), ATH9K_ANI_RSSI_THR_LOW,
239 ATH9K_ANI_RSSI_THR_HIGH);
240
241 if (AR_SREV_9100(ah) && immunityLevel < ATH9K_ANI_CCK_DEF_LEVEL)
242 immunityLevel = ATH9K_ANI_CCK_DEF_LEVEL;
243
244 if (ah->opmode == NL80211_IFTYPE_STATION &&
245 BEACON_RSSI(ah) <= ATH9K_ANI_RSSI_THR_LOW &&
246 immunityLevel > ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI)
247 immunityLevel = ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI;
248
249 if (!scan)
250 aniState->cckNoiseImmunityLevel = immunityLevel;
251
252 entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
253 entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
254
255 if (aniState->firstepLevel != entry_cck->fir_step_level &&
256 entry_cck->fir_step_level >= entry_ofdm->fir_step_level)
257 ath9k_hw_ani_control(ah,
258 ATH9K_ANI_FIRSTEP_LEVEL,
259 entry_cck->fir_step_level);
260
261 /* Skip MRC CCK for pre AR9003 families */
262 if (!AR_SREV_9300_20_OR_LATER(ah) || AR_SREV_9485(ah) || AR_SREV_9565(ah))
263 return;
264
265 if (aniState->mrcCCK != entry_cck->mrc_cck_on)
266 ath9k_hw_ani_control(ah,
267 ATH9K_ANI_MRC_CCK,
268 entry_cck->mrc_cck_on);
269}
270
271static void ath9k_hw_ani_cck_err_trigger(struct ath_hw *ah)
272{
273 struct ar5416AniState *aniState;
274
275 if (!ah->curchan)
276 return;
277
278 aniState = &ah->ani;
279
280 if (aniState->cckNoiseImmunityLevel < ATH9K_ANI_CCK_MAX_LEVEL)
281 ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel + 1,
282 false);
283}
284
285/*
286 * only lower either OFDM or CCK errors per turn
287 * we lower the other one next time
288 */
289static void ath9k_hw_ani_lower_immunity(struct ath_hw *ah)
290{
291 struct ar5416AniState *aniState;
292
293 aniState = &ah->ani;
294
295 /* lower OFDM noise immunity */
296 if (aniState->ofdmNoiseImmunityLevel > 0 &&
297 (aniState->ofdmsTurn || aniState->cckNoiseImmunityLevel == 0)) {
298 ath9k_hw_set_ofdm_nil(ah, aniState->ofdmNoiseImmunityLevel - 1,
299 false);
300 return;
301 }
302
303 /* lower CCK noise immunity */
304 if (aniState->cckNoiseImmunityLevel > 0)
305 ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel - 1,
306 false);
307}
308
309/*
310 * Restore the ANI parameters in the HAL and reset the statistics.
311 * This routine should be called for every hardware reset and for
312 * every channel change.
313 */
314void ath9k_ani_reset(struct ath_hw *ah, bool is_scanning)
315{
316 struct ar5416AniState *aniState = &ah->ani;
317 struct ath9k_channel *chan = ah->curchan;
318 struct ath_common *common = ath9k_hw_common(ah);
319 int ofdm_nil, cck_nil;
320
321 if (!ah->curchan)
322 return;
323
324 BUG_ON(aniState == NULL);
325 ah->stats.ast_ani_reset++;
326
327 ofdm_nil = max_t(int, ATH9K_ANI_OFDM_DEF_LEVEL,
328 aniState->ofdmNoiseImmunityLevel);
329 cck_nil = max_t(int, ATH9K_ANI_CCK_DEF_LEVEL,
330 aniState->cckNoiseImmunityLevel);
331
332 if (is_scanning ||
333 (ah->opmode != NL80211_IFTYPE_STATION &&
334 ah->opmode != NL80211_IFTYPE_ADHOC)) {
335 /*
336 * If we're scanning or in AP mode, the defaults (ini)
337 * should be in place. For an AP we assume the historical
338 * levels for this channel are probably outdated so start
339 * from defaults instead.
340 */
341 if (aniState->ofdmNoiseImmunityLevel !=
342 ATH9K_ANI_OFDM_DEF_LEVEL ||
343 aniState->cckNoiseImmunityLevel !=
344 ATH9K_ANI_CCK_DEF_LEVEL) {
345 ath_dbg(common, ANI,
346 "Restore defaults: opmode %u chan %d Mhz is_scanning=%d ofdm:%d cck:%d\n",
347 ah->opmode,
348 chan->channel,
349 is_scanning,
350 aniState->ofdmNoiseImmunityLevel,
351 aniState->cckNoiseImmunityLevel);
352
353 ofdm_nil = ATH9K_ANI_OFDM_DEF_LEVEL;
354 cck_nil = ATH9K_ANI_CCK_DEF_LEVEL;
355 }
356 } else {
357 /*
358 * restore historical levels for this channel
359 */
360 ath_dbg(common, ANI,
361 "Restore history: opmode %u chan %d Mhz is_scanning=%d ofdm:%d cck:%d\n",
362 ah->opmode,
363 chan->channel,
364 is_scanning,
365 aniState->ofdmNoiseImmunityLevel,
366 aniState->cckNoiseImmunityLevel);
367 }
368 ath9k_hw_set_ofdm_nil(ah, ofdm_nil, is_scanning);
369 ath9k_hw_set_cck_nil(ah, cck_nil, is_scanning);
370
371 ath9k_ani_restart(ah);
372}
373
374static bool ath9k_hw_ani_read_counters(struct ath_hw *ah)
375{
376 struct ath_common *common = ath9k_hw_common(ah);
377 struct ar5416AniState *aniState = &ah->ani;
378 u32 phyCnt1, phyCnt2;
379 int32_t listenTime;
380
381 ath_hw_cycle_counters_update(common);
382 listenTime = ath_hw_get_listen_time(common);
383
384 if (listenTime <= 0) {
385 ah->stats.ast_ani_lneg_or_lzero++;
386 ath9k_ani_restart(ah);
387 return false;
388 }
389
390 aniState->listenTime += listenTime;
391
392 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
393
394 phyCnt1 = REG_READ(ah, AR_PHY_ERR_1);
395 phyCnt2 = REG_READ(ah, AR_PHY_ERR_2);
396
397 ah->stats.ast_ani_ofdmerrs += phyCnt1 - aniState->ofdmPhyErrCount;
398 aniState->ofdmPhyErrCount = phyCnt1;
399
400 ah->stats.ast_ani_cckerrs += phyCnt2 - aniState->cckPhyErrCount;
401 aniState->cckPhyErrCount = phyCnt2;
402
403 return true;
404}
405
406void ath9k_hw_ani_monitor(struct ath_hw *ah, struct ath9k_channel *chan)
407{
408 struct ar5416AniState *aniState;
409 struct ath_common *common = ath9k_hw_common(ah);
410 u32 ofdmPhyErrRate, cckPhyErrRate;
411
412 if (!ah->curchan)
413 return;
414
415 aniState = &ah->ani;
416 if (!ath9k_hw_ani_read_counters(ah))
417 return;
418
419 ofdmPhyErrRate = aniState->ofdmPhyErrCount * 1000 /
420 aniState->listenTime;
421 cckPhyErrRate = aniState->cckPhyErrCount * 1000 /
422 aniState->listenTime;
423
424 ath_dbg(common, ANI,
425 "listenTime=%d OFDM:%d errs=%d/s CCK:%d errs=%d/s ofdm_turn=%d\n",
426 aniState->listenTime,
427 aniState->ofdmNoiseImmunityLevel,
428 ofdmPhyErrRate, aniState->cckNoiseImmunityLevel,
429 cckPhyErrRate, aniState->ofdmsTurn);
430
431 if (aniState->listenTime > ah->aniperiod) {
432 if (cckPhyErrRate < ah->config.cck_trig_low &&
433 ofdmPhyErrRate < ah->config.ofdm_trig_low) {
434 ath9k_hw_ani_lower_immunity(ah);
435 aniState->ofdmsTurn = !aniState->ofdmsTurn;
436 } else if (ofdmPhyErrRate > ah->config.ofdm_trig_high) {
437 ath9k_hw_ani_ofdm_err_trigger(ah);
438 aniState->ofdmsTurn = false;
439 } else if (cckPhyErrRate > ah->config.cck_trig_high) {
440 ath9k_hw_ani_cck_err_trigger(ah);
441 aniState->ofdmsTurn = true;
442 }
443 ath9k_ani_restart(ah);
444 }
445}
446EXPORT_SYMBOL(ath9k_hw_ani_monitor);
447
448void ath9k_enable_mib_counters(struct ath_hw *ah)
449{
450 struct ath_common *common = ath9k_hw_common(ah);
451
452 ath_dbg(common, ANI, "Enable MIB counters\n");
453
454 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
455
456 ENABLE_REGWRITE_BUFFER(ah);
457
458 REG_WRITE(ah, AR_FILT_OFDM, 0);
459 REG_WRITE(ah, AR_FILT_CCK, 0);
460 REG_WRITE(ah, AR_MIBC,
461 ~(AR_MIBC_COW | AR_MIBC_FMC | AR_MIBC_CMC | AR_MIBC_MCS)
462 & 0x0f);
463 REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
464 REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
465
466 REGWRITE_BUFFER_FLUSH(ah);
467}
468
469/* Freeze the MIB counters, get the stats and then clear them */
470void ath9k_hw_disable_mib_counters(struct ath_hw *ah)
471{
472 struct ath_common *common = ath9k_hw_common(ah);
473
474 ath_dbg(common, ANI, "Disable MIB counters\n");
475
476 REG_WRITE(ah, AR_MIBC, AR_MIBC_FMC);
477 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
478 REG_WRITE(ah, AR_MIBC, AR_MIBC_CMC);
479 REG_WRITE(ah, AR_FILT_OFDM, 0);
480 REG_WRITE(ah, AR_FILT_CCK, 0);
481}
482EXPORT_SYMBOL(ath9k_hw_disable_mib_counters);
483
484void ath9k_hw_ani_init(struct ath_hw *ah)
485{
486 struct ath_common *common = ath9k_hw_common(ah);
487 struct ar5416AniState *ani = &ah->ani;
488
489 ath_dbg(common, ANI, "Initialize ANI\n");
490
491 if (AR_SREV_9300_20_OR_LATER(ah)) {
492 ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH;
493 ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW;
494 ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH;
495 ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW;
496 } else {
497 ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_OLD;
498 ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_OLD;
499 ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH_OLD;
500 ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW_OLD;
501 }
502
503 ani->spurImmunityLevel = ATH9K_ANI_SPUR_IMMUNE_LVL;
504 ani->firstepLevel = ATH9K_ANI_FIRSTEP_LVL;
505 ani->mrcCCK = AR_SREV_9300_20_OR_LATER(ah) ? true : false;
506 ani->ofdmsTurn = true;
507 ani->ofdmWeakSigDetect = true;
508 ani->cckNoiseImmunityLevel = ATH9K_ANI_CCK_DEF_LEVEL;
509 ani->ofdmNoiseImmunityLevel = ATH9K_ANI_OFDM_DEF_LEVEL;
510
511 /*
512 * since we expect some ongoing maintenance on the tables, let's sanity
513 * check here default level should not modify INI setting.
514 */
515 ah->aniperiod = ATH9K_ANI_PERIOD;
516 ah->config.ani_poll_interval = ATH9K_ANI_POLLINTERVAL;
517
518 ath9k_ani_restart(ah);
519 ath9k_enable_mib_counters(ah);
520}