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
22 struct 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
39 static 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
80 struct ani_cck_level_entry {
81 int fir_step_level;
82 int mrc_cck_on;
83 };
84
85 static 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
use_new_ani(struct ath_hw * ah)107 static bool use_new_ani(struct ath_hw *ah)
108 {
109 return AR_SREV_9300_20_OR_LATER(ah) || modparam_force_new_ani;
110 }
111
ath9k_hw_update_mibstats(struct ath_hw * ah,struct ath9k_mib_stats * stats)112 static void ath9k_hw_update_mibstats(struct ath_hw *ah,
113 struct ath9k_mib_stats *stats)
114 {
115 stats->ackrcv_bad += REG_READ(ah, AR_ACK_FAIL);
116 stats->rts_bad += REG_READ(ah, AR_RTS_FAIL);
117 stats->fcs_bad += REG_READ(ah, AR_FCS_FAIL);
118 stats->rts_good += REG_READ(ah, AR_RTS_OK);
119 stats->beacons += REG_READ(ah, AR_BEACON_CNT);
120 }
121
ath9k_ani_restart(struct ath_hw * ah)122 static void ath9k_ani_restart(struct ath_hw *ah)
123 {
124 struct ar5416AniState *aniState;
125 struct ath_common *common = ath9k_hw_common(ah);
126 u32 ofdm_base = 0, cck_base = 0;
127
128 if (!DO_ANI(ah))
129 return;
130
131 aniState = &ah->curchan->ani;
132 aniState->listenTime = 0;
133
134 if (!use_new_ani(ah)) {
135 ofdm_base = AR_PHY_COUNTMAX - ah->config.ofdm_trig_high;
136 cck_base = AR_PHY_COUNTMAX - ah->config.cck_trig_high;
137 }
138
139 ath_dbg(common, ANI, "Writing ofdmbase=%u cckbase=%u\n",
140 ofdm_base, cck_base);
141
142 ENABLE_REGWRITE_BUFFER(ah);
143
144 REG_WRITE(ah, AR_PHY_ERR_1, ofdm_base);
145 REG_WRITE(ah, AR_PHY_ERR_2, cck_base);
146 REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
147 REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
148
149 REGWRITE_BUFFER_FLUSH(ah);
150
151 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
152
153 aniState->ofdmPhyErrCount = 0;
154 aniState->cckPhyErrCount = 0;
155 }
156
ath9k_hw_ani_ofdm_err_trigger_old(struct ath_hw * ah)157 static void ath9k_hw_ani_ofdm_err_trigger_old(struct ath_hw *ah)
158 {
159 struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
160 struct ar5416AniState *aniState;
161 int32_t rssi;
162
163 aniState = &ah->curchan->ani;
164
165 if (aniState->noiseImmunityLevel < HAL_NOISE_IMMUNE_MAX) {
166 if (ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
167 aniState->noiseImmunityLevel + 1)) {
168 return;
169 }
170 }
171
172 if (aniState->spurImmunityLevel < HAL_SPUR_IMMUNE_MAX) {
173 if (ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
174 aniState->spurImmunityLevel + 1)) {
175 return;
176 }
177 }
178
179 if (ah->opmode == NL80211_IFTYPE_AP) {
180 if (aniState->firstepLevel < HAL_FIRST_STEP_MAX) {
181 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
182 aniState->firstepLevel + 1);
183 }
184 return;
185 }
186 rssi = BEACON_RSSI(ah);
187 if (rssi > aniState->rssiThrHigh) {
188 if (!aniState->ofdmWeakSigDetectOff) {
189 if (ath9k_hw_ani_control(ah,
190 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
191 false)) {
192 ath9k_hw_ani_control(ah,
193 ATH9K_ANI_SPUR_IMMUNITY_LEVEL, 0);
194 return;
195 }
196 }
197 if (aniState->firstepLevel < HAL_FIRST_STEP_MAX) {
198 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
199 aniState->firstepLevel + 1);
200 return;
201 }
202 } else if (rssi > aniState->rssiThrLow) {
203 if (aniState->ofdmWeakSigDetectOff)
204 ath9k_hw_ani_control(ah,
205 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
206 true);
207 if (aniState->firstepLevel < HAL_FIRST_STEP_MAX)
208 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
209 aniState->firstepLevel + 1);
210 return;
211 } else {
212 if ((conf->channel->band == IEEE80211_BAND_2GHZ) &&
213 !conf_is_ht(conf)) {
214 if (!aniState->ofdmWeakSigDetectOff)
215 ath9k_hw_ani_control(ah,
216 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
217 false);
218 if (aniState->firstepLevel > 0)
219 ath9k_hw_ani_control(ah,
220 ATH9K_ANI_FIRSTEP_LEVEL, 0);
221 return;
222 }
223 }
224 }
225
ath9k_hw_ani_cck_err_trigger_old(struct ath_hw * ah)226 static void ath9k_hw_ani_cck_err_trigger_old(struct ath_hw *ah)
227 {
228 struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
229 struct ar5416AniState *aniState;
230 int32_t rssi;
231
232 aniState = &ah->curchan->ani;
233 if (aniState->noiseImmunityLevel < HAL_NOISE_IMMUNE_MAX) {
234 if (ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
235 aniState->noiseImmunityLevel + 1)) {
236 return;
237 }
238 }
239 if (ah->opmode == NL80211_IFTYPE_AP) {
240 if (aniState->firstepLevel < HAL_FIRST_STEP_MAX) {
241 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
242 aniState->firstepLevel + 1);
243 }
244 return;
245 }
246 rssi = BEACON_RSSI(ah);
247 if (rssi > aniState->rssiThrLow) {
248 if (aniState->firstepLevel < HAL_FIRST_STEP_MAX)
249 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
250 aniState->firstepLevel + 1);
251 } else {
252 if ((conf->channel->band == IEEE80211_BAND_2GHZ) &&
253 !conf_is_ht(conf)) {
254 if (aniState->firstepLevel > 0)
255 ath9k_hw_ani_control(ah,
256 ATH9K_ANI_FIRSTEP_LEVEL, 0);
257 }
258 }
259 }
260
261 /* Adjust the OFDM Noise Immunity Level */
ath9k_hw_set_ofdm_nil(struct ath_hw * ah,u8 immunityLevel)262 static void ath9k_hw_set_ofdm_nil(struct ath_hw *ah, u8 immunityLevel)
263 {
264 struct ar5416AniState *aniState = &ah->curchan->ani;
265 struct ath_common *common = ath9k_hw_common(ah);
266 const struct ani_ofdm_level_entry *entry_ofdm;
267 const struct ani_cck_level_entry *entry_cck;
268
269 aniState->noiseFloor = BEACON_RSSI(ah);
270
271 ath_dbg(common, ANI, "**** ofdmlevel %d=>%d, rssi=%d[lo=%d hi=%d]\n",
272 aniState->ofdmNoiseImmunityLevel,
273 immunityLevel, aniState->noiseFloor,
274 aniState->rssiThrLow, aniState->rssiThrHigh);
275
276 if (aniState->update_ani)
277 aniState->ofdmNoiseImmunityLevel = immunityLevel;
278
279 entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
280 entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
281
282 if (aniState->spurImmunityLevel != entry_ofdm->spur_immunity_level)
283 ath9k_hw_ani_control(ah,
284 ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
285 entry_ofdm->spur_immunity_level);
286
287 if (aniState->firstepLevel != entry_ofdm->fir_step_level &&
288 entry_ofdm->fir_step_level >= entry_cck->fir_step_level)
289 ath9k_hw_ani_control(ah,
290 ATH9K_ANI_FIRSTEP_LEVEL,
291 entry_ofdm->fir_step_level);
292
293 if ((ah->opmode != NL80211_IFTYPE_STATION &&
294 ah->opmode != NL80211_IFTYPE_ADHOC) ||
295 aniState->noiseFloor <= aniState->rssiThrHigh) {
296 if (aniState->ofdmWeakSigDetectOff)
297 /* force on ofdm weak sig detect */
298 ath9k_hw_ani_control(ah,
299 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
300 true);
301 else if (aniState->ofdmWeakSigDetectOff ==
302 entry_ofdm->ofdm_weak_signal_on)
303 ath9k_hw_ani_control(ah,
304 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
305 entry_ofdm->ofdm_weak_signal_on);
306 }
307 }
308
ath9k_hw_ani_ofdm_err_trigger(struct ath_hw * ah)309 static void ath9k_hw_ani_ofdm_err_trigger(struct ath_hw *ah)
310 {
311 struct ar5416AniState *aniState;
312
313 if (!DO_ANI(ah))
314 return;
315
316 if (!use_new_ani(ah)) {
317 ath9k_hw_ani_ofdm_err_trigger_old(ah);
318 return;
319 }
320
321 aniState = &ah->curchan->ani;
322
323 if (aniState->ofdmNoiseImmunityLevel < ATH9K_ANI_OFDM_MAX_LEVEL)
324 ath9k_hw_set_ofdm_nil(ah, aniState->ofdmNoiseImmunityLevel + 1);
325 }
326
327 /*
328 * Set the ANI settings to match an CCK level.
329 */
ath9k_hw_set_cck_nil(struct ath_hw * ah,u_int8_t immunityLevel)330 static void ath9k_hw_set_cck_nil(struct ath_hw *ah, u_int8_t immunityLevel)
331 {
332 struct ar5416AniState *aniState = &ah->curchan->ani;
333 struct ath_common *common = ath9k_hw_common(ah);
334 const struct ani_ofdm_level_entry *entry_ofdm;
335 const struct ani_cck_level_entry *entry_cck;
336
337 aniState->noiseFloor = BEACON_RSSI(ah);
338 ath_dbg(common, ANI, "**** 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 if (aniState->update_ani)
350 aniState->cckNoiseImmunityLevel = immunityLevel;
351
352 entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
353 entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
354
355 if (aniState->firstepLevel != entry_cck->fir_step_level &&
356 entry_cck->fir_step_level >= entry_ofdm->fir_step_level)
357 ath9k_hw_ani_control(ah,
358 ATH9K_ANI_FIRSTEP_LEVEL,
359 entry_cck->fir_step_level);
360
361 /* Skip MRC CCK for pre AR9003 families */
362 if (!AR_SREV_9300_20_OR_LATER(ah) || AR_SREV_9485(ah))
363 return;
364
365 if (aniState->mrcCCKOff == entry_cck->mrc_cck_on)
366 ath9k_hw_ani_control(ah,
367 ATH9K_ANI_MRC_CCK,
368 entry_cck->mrc_cck_on);
369 }
370
ath9k_hw_ani_cck_err_trigger(struct ath_hw * ah)371 static void ath9k_hw_ani_cck_err_trigger(struct ath_hw *ah)
372 {
373 struct ar5416AniState *aniState;
374
375 if (!DO_ANI(ah))
376 return;
377
378 if (!use_new_ani(ah)) {
379 ath9k_hw_ani_cck_err_trigger_old(ah);
380 return;
381 }
382
383 aniState = &ah->curchan->ani;
384
385 if (aniState->cckNoiseImmunityLevel < ATH9K_ANI_CCK_MAX_LEVEL)
386 ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel + 1);
387 }
388
ath9k_hw_ani_lower_immunity_old(struct ath_hw * ah)389 static void ath9k_hw_ani_lower_immunity_old(struct ath_hw *ah)
390 {
391 struct ar5416AniState *aniState;
392 int32_t rssi;
393
394 aniState = &ah->curchan->ani;
395
396 if (ah->opmode == NL80211_IFTYPE_AP) {
397 if (aniState->firstepLevel > 0) {
398 if (ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
399 aniState->firstepLevel - 1))
400 return;
401 }
402 } else {
403 rssi = BEACON_RSSI(ah);
404 if (rssi > aniState->rssiThrHigh) {
405 /* XXX: Handle me */
406 } else if (rssi > aniState->rssiThrLow) {
407 if (aniState->ofdmWeakSigDetectOff) {
408 if (ath9k_hw_ani_control(ah,
409 ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
410 true))
411 return;
412 }
413 if (aniState->firstepLevel > 0) {
414 if (ath9k_hw_ani_control(ah,
415 ATH9K_ANI_FIRSTEP_LEVEL,
416 aniState->firstepLevel - 1))
417 return;
418 }
419 } else {
420 if (aniState->firstepLevel > 0) {
421 if (ath9k_hw_ani_control(ah,
422 ATH9K_ANI_FIRSTEP_LEVEL,
423 aniState->firstepLevel - 1))
424 return;
425 }
426 }
427 }
428
429 if (aniState->spurImmunityLevel > 0) {
430 if (ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
431 aniState->spurImmunityLevel - 1))
432 return;
433 }
434
435 if (aniState->noiseImmunityLevel > 0) {
436 ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
437 aniState->noiseImmunityLevel - 1);
438 return;
439 }
440 }
441
442 /*
443 * only lower either OFDM or CCK errors per turn
444 * we lower the other one next time
445 */
ath9k_hw_ani_lower_immunity(struct ath_hw * ah)446 static void ath9k_hw_ani_lower_immunity(struct ath_hw *ah)
447 {
448 struct ar5416AniState *aniState;
449
450 aniState = &ah->curchan->ani;
451
452 if (!use_new_ani(ah)) {
453 ath9k_hw_ani_lower_immunity_old(ah);
454 return;
455 }
456
457 /* lower OFDM noise immunity */
458 if (aniState->ofdmNoiseImmunityLevel > 0 &&
459 (aniState->ofdmsTurn || aniState->cckNoiseImmunityLevel == 0)) {
460 ath9k_hw_set_ofdm_nil(ah, aniState->ofdmNoiseImmunityLevel - 1);
461 return;
462 }
463
464 /* lower CCK noise immunity */
465 if (aniState->cckNoiseImmunityLevel > 0)
466 ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel - 1);
467 }
468
ath9k_ani_reset_old(struct ath_hw * ah,bool is_scanning)469 static void ath9k_ani_reset_old(struct ath_hw *ah, bool is_scanning)
470 {
471 struct ar5416AniState *aniState;
472 struct ath9k_channel *chan = ah->curchan;
473 struct ath_common *common = ath9k_hw_common(ah);
474
475 if (!DO_ANI(ah))
476 return;
477
478 aniState = &ah->curchan->ani;
479
480 if (ah->opmode != NL80211_IFTYPE_STATION
481 && ah->opmode != NL80211_IFTYPE_ADHOC) {
482 ath_dbg(common, ANI, "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_ani_restart(ah);
506 return;
507 }
508
509 if (aniState->noiseImmunityLevel != 0)
510 ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
511 aniState->noiseImmunityLevel);
512 if (aniState->spurImmunityLevel != 0)
513 ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
514 aniState->spurImmunityLevel);
515 if (aniState->ofdmWeakSigDetectOff)
516 ath9k_hw_ani_control(ah, ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
517 !aniState->ofdmWeakSigDetectOff);
518 if (aniState->cckWeakSigThreshold)
519 ath9k_hw_ani_control(ah, ATH9K_ANI_CCK_WEAK_SIGNAL_THR,
520 aniState->cckWeakSigThreshold);
521 if (aniState->firstepLevel != 0)
522 ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
523 aniState->firstepLevel);
524
525 ath9k_ani_restart(ah);
526
527 ENABLE_REGWRITE_BUFFER(ah);
528
529 REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
530 REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
531
532 REGWRITE_BUFFER_FLUSH(ah);
533 }
534
535 /*
536 * Restore the ANI parameters in the HAL and reset the statistics.
537 * This routine should be called for every hardware reset and for
538 * every channel change.
539 */
ath9k_ani_reset(struct ath_hw * ah,bool is_scanning)540 void ath9k_ani_reset(struct ath_hw *ah, bool is_scanning)
541 {
542 struct ar5416AniState *aniState = &ah->curchan->ani;
543 struct ath9k_channel *chan = ah->curchan;
544 struct ath_common *common = ath9k_hw_common(ah);
545
546 if (!DO_ANI(ah))
547 return;
548
549 if (!use_new_ani(ah))
550 return ath9k_ani_reset_old(ah, is_scanning);
551
552 BUG_ON(aniState == NULL);
553 ah->stats.ast_ani_reset++;
554
555 /* only allow a subset of functions in AP mode */
556 if (ah->opmode == NL80211_IFTYPE_AP) {
557 if (IS_CHAN_2GHZ(chan)) {
558 ah->ani_function = (ATH9K_ANI_SPUR_IMMUNITY_LEVEL |
559 ATH9K_ANI_FIRSTEP_LEVEL);
560 if (AR_SREV_9300_20_OR_LATER(ah))
561 ah->ani_function |= ATH9K_ANI_MRC_CCK;
562 } else
563 ah->ani_function = 0;
564 }
565
566 /* always allow mode (on/off) to be controlled */
567 ah->ani_function |= ATH9K_ANI_MODE;
568
569 if (is_scanning ||
570 (ah->opmode != NL80211_IFTYPE_STATION &&
571 ah->opmode != NL80211_IFTYPE_ADHOC)) {
572 /*
573 * If we're scanning or in AP mode, the defaults (ini)
574 * should be in place. For an AP we assume the historical
575 * levels for this channel are probably outdated so start
576 * from defaults instead.
577 */
578 if (aniState->ofdmNoiseImmunityLevel !=
579 ATH9K_ANI_OFDM_DEF_LEVEL ||
580 aniState->cckNoiseImmunityLevel !=
581 ATH9K_ANI_CCK_DEF_LEVEL) {
582 ath_dbg(common, ANI,
583 "Restore defaults: opmode %u chan %d Mhz/0x%x is_scanning=%d ofdm:%d cck:%d\n",
584 ah->opmode,
585 chan->channel,
586 chan->channelFlags,
587 is_scanning,
588 aniState->ofdmNoiseImmunityLevel,
589 aniState->cckNoiseImmunityLevel);
590
591 aniState->update_ani = false;
592 ath9k_hw_set_ofdm_nil(ah, ATH9K_ANI_OFDM_DEF_LEVEL);
593 ath9k_hw_set_cck_nil(ah, ATH9K_ANI_CCK_DEF_LEVEL);
594 }
595 } else {
596 /*
597 * restore historical levels for this channel
598 */
599 ath_dbg(common, ANI,
600 "Restore history: opmode %u chan %d Mhz/0x%x is_scanning=%d ofdm:%d cck:%d\n",
601 ah->opmode,
602 chan->channel,
603 chan->channelFlags,
604 is_scanning,
605 aniState->ofdmNoiseImmunityLevel,
606 aniState->cckNoiseImmunityLevel);
607
608 aniState->update_ani = true;
609 ath9k_hw_set_ofdm_nil(ah,
610 aniState->ofdmNoiseImmunityLevel);
611 ath9k_hw_set_cck_nil(ah,
612 aniState->cckNoiseImmunityLevel);
613 }
614
615 /*
616 * enable phy counters if hw supports or if not, enable phy
617 * interrupts (so we can count each one)
618 */
619 ath9k_ani_restart(ah);
620
621 ENABLE_REGWRITE_BUFFER(ah);
622
623 REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
624 REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
625
626 REGWRITE_BUFFER_FLUSH(ah);
627 }
628
ath9k_hw_ani_read_counters(struct ath_hw * ah)629 static bool ath9k_hw_ani_read_counters(struct ath_hw *ah)
630 {
631 struct ath_common *common = ath9k_hw_common(ah);
632 struct ar5416AniState *aniState = &ah->curchan->ani;
633 u32 ofdm_base = 0;
634 u32 cck_base = 0;
635 u32 ofdmPhyErrCnt, cckPhyErrCnt;
636 u32 phyCnt1, phyCnt2;
637 int32_t listenTime;
638
639 ath_hw_cycle_counters_update(common);
640 listenTime = ath_hw_get_listen_time(common);
641
642 if (listenTime <= 0) {
643 ah->stats.ast_ani_lneg_or_lzero++;
644 ath9k_ani_restart(ah);
645 return false;
646 }
647
648 if (!use_new_ani(ah)) {
649 ofdm_base = AR_PHY_COUNTMAX - ah->config.ofdm_trig_high;
650 cck_base = AR_PHY_COUNTMAX - ah->config.cck_trig_high;
651 }
652
653 aniState->listenTime += listenTime;
654
655 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
656
657 phyCnt1 = REG_READ(ah, AR_PHY_ERR_1);
658 phyCnt2 = REG_READ(ah, AR_PHY_ERR_2);
659
660 if (!use_new_ani(ah) && (phyCnt1 < ofdm_base || phyCnt2 < cck_base)) {
661 if (phyCnt1 < ofdm_base) {
662 ath_dbg(common, ANI,
663 "phyCnt1 0x%x, resetting counter value to 0x%x\n",
664 phyCnt1, ofdm_base);
665 REG_WRITE(ah, AR_PHY_ERR_1, ofdm_base);
666 REG_WRITE(ah, AR_PHY_ERR_MASK_1,
667 AR_PHY_ERR_OFDM_TIMING);
668 }
669 if (phyCnt2 < cck_base) {
670 ath_dbg(common, ANI,
671 "phyCnt2 0x%x, resetting counter value to 0x%x\n",
672 phyCnt2, cck_base);
673 REG_WRITE(ah, AR_PHY_ERR_2, cck_base);
674 REG_WRITE(ah, AR_PHY_ERR_MASK_2,
675 AR_PHY_ERR_CCK_TIMING);
676 }
677 return false;
678 }
679
680 ofdmPhyErrCnt = phyCnt1 - ofdm_base;
681 ah->stats.ast_ani_ofdmerrs +=
682 ofdmPhyErrCnt - aniState->ofdmPhyErrCount;
683 aniState->ofdmPhyErrCount = ofdmPhyErrCnt;
684
685 cckPhyErrCnt = phyCnt2 - cck_base;
686 ah->stats.ast_ani_cckerrs +=
687 cckPhyErrCnt - aniState->cckPhyErrCount;
688 aniState->cckPhyErrCount = cckPhyErrCnt;
689 return true;
690 }
691
ath9k_hw_ani_monitor(struct ath_hw * ah,struct ath9k_channel * chan)692 void ath9k_hw_ani_monitor(struct ath_hw *ah, struct ath9k_channel *chan)
693 {
694 struct ar5416AniState *aniState;
695 struct ath_common *common = ath9k_hw_common(ah);
696 u32 ofdmPhyErrRate, cckPhyErrRate;
697
698 if (!DO_ANI(ah))
699 return;
700
701 aniState = &ah->curchan->ani;
702 if (WARN_ON(!aniState))
703 return;
704
705 if (!ath9k_hw_ani_read_counters(ah))
706 return;
707
708 ofdmPhyErrRate = aniState->ofdmPhyErrCount * 1000 /
709 aniState->listenTime;
710 cckPhyErrRate = aniState->cckPhyErrCount * 1000 /
711 aniState->listenTime;
712
713 ath_dbg(common, ANI,
714 "listenTime=%d OFDM:%d errs=%d/s CCK:%d errs=%d/s ofdm_turn=%d\n",
715 aniState->listenTime,
716 aniState->ofdmNoiseImmunityLevel,
717 ofdmPhyErrRate, aniState->cckNoiseImmunityLevel,
718 cckPhyErrRate, aniState->ofdmsTurn);
719
720 if (aniState->listenTime > 5 * ah->aniperiod) {
721 if (ofdmPhyErrRate <= ah->config.ofdm_trig_low &&
722 cckPhyErrRate <= ah->config.cck_trig_low) {
723 ath9k_hw_ani_lower_immunity(ah);
724 aniState->ofdmsTurn = !aniState->ofdmsTurn;
725 }
726 ath9k_ani_restart(ah);
727 } else if (aniState->listenTime > ah->aniperiod) {
728 /* check to see if need to raise immunity */
729 if (ofdmPhyErrRate > ah->config.ofdm_trig_high &&
730 (cckPhyErrRate <= ah->config.cck_trig_high ||
731 aniState->ofdmsTurn)) {
732 ath9k_hw_ani_ofdm_err_trigger(ah);
733 ath9k_ani_restart(ah);
734 aniState->ofdmsTurn = false;
735 } else if (cckPhyErrRate > ah->config.cck_trig_high) {
736 ath9k_hw_ani_cck_err_trigger(ah);
737 ath9k_ani_restart(ah);
738 aniState->ofdmsTurn = true;
739 }
740 }
741 }
742 EXPORT_SYMBOL(ath9k_hw_ani_monitor);
743
ath9k_enable_mib_counters(struct ath_hw * ah)744 void ath9k_enable_mib_counters(struct ath_hw *ah)
745 {
746 struct ath_common *common = ath9k_hw_common(ah);
747
748 ath_dbg(common, ANI, "Enable MIB counters\n");
749
750 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
751
752 ENABLE_REGWRITE_BUFFER(ah);
753
754 REG_WRITE(ah, AR_FILT_OFDM, 0);
755 REG_WRITE(ah, AR_FILT_CCK, 0);
756 REG_WRITE(ah, AR_MIBC,
757 ~(AR_MIBC_COW | AR_MIBC_FMC | AR_MIBC_CMC | AR_MIBC_MCS)
758 & 0x0f);
759 REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
760 REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
761
762 REGWRITE_BUFFER_FLUSH(ah);
763 }
764
765 /* Freeze the MIB counters, get the stats and then clear them */
ath9k_hw_disable_mib_counters(struct ath_hw * ah)766 void ath9k_hw_disable_mib_counters(struct ath_hw *ah)
767 {
768 struct ath_common *common = ath9k_hw_common(ah);
769
770 ath_dbg(common, ANI, "Disable MIB counters\n");
771
772 REG_WRITE(ah, AR_MIBC, AR_MIBC_FMC);
773 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
774 REG_WRITE(ah, AR_MIBC, AR_MIBC_CMC);
775 REG_WRITE(ah, AR_FILT_OFDM, 0);
776 REG_WRITE(ah, AR_FILT_CCK, 0);
777 }
778 EXPORT_SYMBOL(ath9k_hw_disable_mib_counters);
779
780 /*
781 * Process a MIB interrupt. We may potentially be invoked because
782 * any of the MIB counters overflow/trigger so don't assume we're
783 * here because a PHY error counter triggered.
784 */
ath9k_hw_proc_mib_event(struct ath_hw * ah)785 void ath9k_hw_proc_mib_event(struct ath_hw *ah)
786 {
787 u32 phyCnt1, phyCnt2;
788
789 /* Reset these counters regardless */
790 REG_WRITE(ah, AR_FILT_OFDM, 0);
791 REG_WRITE(ah, AR_FILT_CCK, 0);
792 if (!(REG_READ(ah, AR_SLP_MIB_CTRL) & AR_SLP_MIB_PENDING))
793 REG_WRITE(ah, AR_SLP_MIB_CTRL, AR_SLP_MIB_CLEAR);
794
795 /* Clear the mib counters and save them in the stats */
796 ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
797
798 if (!DO_ANI(ah)) {
799 /*
800 * We must always clear the interrupt cause by
801 * resetting the phy error regs.
802 */
803 REG_WRITE(ah, AR_PHY_ERR_1, 0);
804 REG_WRITE(ah, AR_PHY_ERR_2, 0);
805 return;
806 }
807
808 /* NB: these are not reset-on-read */
809 phyCnt1 = REG_READ(ah, AR_PHY_ERR_1);
810 phyCnt2 = REG_READ(ah, AR_PHY_ERR_2);
811 if (((phyCnt1 & AR_MIBCNT_INTRMASK) == AR_MIBCNT_INTRMASK) ||
812 ((phyCnt2 & AR_MIBCNT_INTRMASK) == AR_MIBCNT_INTRMASK)) {
813
814 if (!use_new_ani(ah))
815 ath9k_hw_ani_read_counters(ah);
816
817 /* NB: always restart to insure the h/w counters are reset */
818 ath9k_ani_restart(ah);
819 }
820 }
821 EXPORT_SYMBOL(ath9k_hw_proc_mib_event);
822
ath9k_hw_ani_setup(struct ath_hw * ah)823 void ath9k_hw_ani_setup(struct ath_hw *ah)
824 {
825 int i;
826
827 static const int totalSizeDesired[] = { -55, -55, -55, -55, -62 };
828 static const int coarseHigh[] = { -14, -14, -14, -14, -12 };
829 static const int coarseLow[] = { -64, -64, -64, -64, -70 };
830 static const int firpwr[] = { -78, -78, -78, -78, -80 };
831
832 for (i = 0; i < 5; i++) {
833 ah->totalSizeDesired[i] = totalSizeDesired[i];
834 ah->coarse_high[i] = coarseHigh[i];
835 ah->coarse_low[i] = coarseLow[i];
836 ah->firpwr[i] = firpwr[i];
837 }
838 }
839
ath9k_hw_ani_init(struct ath_hw * ah)840 void ath9k_hw_ani_init(struct ath_hw *ah)
841 {
842 struct ath_common *common = ath9k_hw_common(ah);
843 int i;
844
845 ath_dbg(common, ANI, "Initialize ANI\n");
846
847 if (use_new_ani(ah)) {
848 ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_NEW;
849 ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_NEW;
850
851 ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH_NEW;
852 ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW_NEW;
853 } else {
854 ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_OLD;
855 ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_OLD;
856
857 ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH_OLD;
858 ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW_OLD;
859 }
860
861 for (i = 0; i < ARRAY_SIZE(ah->channels); i++) {
862 struct ath9k_channel *chan = &ah->channels[i];
863 struct ar5416AniState *ani = &chan->ani;
864
865 if (use_new_ani(ah)) {
866 ani->spurImmunityLevel =
867 ATH9K_ANI_SPUR_IMMUNE_LVL_NEW;
868
869 ani->firstepLevel = ATH9K_ANI_FIRSTEP_LVL_NEW;
870
871 if (AR_SREV_9300_20_OR_LATER(ah))
872 ani->mrcCCKOff =
873 !ATH9K_ANI_ENABLE_MRC_CCK;
874 else
875 ani->mrcCCKOff = true;
876
877 ani->ofdmsTurn = true;
878 } else {
879 ani->spurImmunityLevel =
880 ATH9K_ANI_SPUR_IMMUNE_LVL_OLD;
881 ani->firstepLevel = ATH9K_ANI_FIRSTEP_LVL_OLD;
882
883 ani->cckWeakSigThreshold =
884 ATH9K_ANI_CCK_WEAK_SIG_THR;
885 }
886
887 ani->rssiThrHigh = ATH9K_ANI_RSSI_THR_HIGH;
888 ani->rssiThrLow = ATH9K_ANI_RSSI_THR_LOW;
889 ani->ofdmWeakSigDetectOff =
890 !ATH9K_ANI_USE_OFDM_WEAK_SIG;
891 ani->cckNoiseImmunityLevel = ATH9K_ANI_CCK_DEF_LEVEL;
892 ani->ofdmNoiseImmunityLevel = ATH9K_ANI_OFDM_DEF_LEVEL;
893 ani->update_ani = false;
894 }
895
896 /*
897 * since we expect some ongoing maintenance on the tables, let's sanity
898 * check here default level should not modify INI setting.
899 */
900 if (use_new_ani(ah)) {
901 ah->aniperiod = ATH9K_ANI_PERIOD_NEW;
902 ah->config.ani_poll_interval = ATH9K_ANI_POLLINTERVAL_NEW;
903 } else {
904 ah->aniperiod = ATH9K_ANI_PERIOD_OLD;
905 ah->config.ani_poll_interval = ATH9K_ANI_POLLINTERVAL_OLD;
906 }
907
908 if (ah->config.enable_ani)
909 ah->proc_phyerr |= HAL_PROCESS_ANI;
910
911 ath9k_ani_restart(ah);
912 ath9k_enable_mib_counters(ah);
913 }
914