2 * Copyright (c) 2008-2011 Atheros Communications Inc.
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.
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.
20 /* Common calibration code */
22 #define ATH9K_NF_TOO_HIGH -60
24 static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer)
27 int16_t sort[ATH9K_NF_CAL_HIST_MAX];
30 for (i = 0; i < ATH9K_NF_CAL_HIST_MAX; i++)
31 sort[i] = nfCalBuffer[i];
33 for (i = 0; i < ATH9K_NF_CAL_HIST_MAX - 1; i++) {
34 for (j = 1; j < ATH9K_NF_CAL_HIST_MAX - i; j++) {
35 if (sort[j] > sort[j - 1]) {
37 sort[j] = sort[j - 1];
42 nfval = sort[(ATH9K_NF_CAL_HIST_MAX - 1) >> 1];
47 static struct ath_nf_limits *ath9k_hw_get_nf_limits(struct ath_hw *ah,
48 struct ath9k_channel *chan)
50 struct ath_nf_limits *limit;
52 if (!chan || IS_CHAN_2GHZ(chan))
60 static s16 ath9k_hw_get_default_nf(struct ath_hw *ah,
61 struct ath9k_channel *chan)
63 return ath9k_hw_get_nf_limits(ah, chan)->nominal;
66 s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan)
68 s8 noise = ATH_DEFAULT_NOISE_FLOOR;
70 if (chan && chan->noisefloor) {
71 s8 delta = chan->noisefloor -
72 ath9k_hw_get_default_nf(ah, chan);
78 EXPORT_SYMBOL(ath9k_hw_getchan_noise);
80 static void ath9k_hw_update_nfcal_hist_buffer(struct ath_hw *ah,
81 struct ath9k_hw_cal_data *cal,
84 struct ath_common *common = ath9k_hw_common(ah);
85 struct ath_nf_limits *limit;
86 struct ath9k_nfcal_hist *h;
87 bool high_nf_mid = false;
88 u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask;
92 limit = ath9k_hw_get_nf_limits(ah, ah->curchan);
94 for (i = 0; i < NUM_NF_READINGS; i++) {
95 if (!(chainmask & (1 << i)) ||
96 ((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(ah->curchan)))
99 h[i].nfCalBuffer[h[i].currIndex] = nfarray[i];
101 if (++h[i].currIndex >= ATH9K_NF_CAL_HIST_MAX)
104 if (h[i].invalidNFcount > 0) {
105 h[i].invalidNFcount--;
106 h[i].privNF = nfarray[i];
109 ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer);
115 if (h[i].privNF > limit->max) {
118 ath_dbg(common, ATH_DBG_CALIBRATE,
119 "NFmid[%d] (%d) > MAX (%d), %s\n",
120 i, h[i].privNF, limit->max,
121 (cal->nfcal_interference ?
122 "not corrected (due to interference)" :
123 "correcting to MAX"));
126 * Normally we limit the average noise floor by the
127 * hardware specific maximum here. However if we have
128 * encountered stuck beacons because of interference,
129 * we bypass this limit here in order to better deal
130 * with our environment.
132 if (!cal->nfcal_interference)
133 h[i].privNF = limit->max;
138 * If the noise floor seems normal for all chains, assume that
139 * there is no significant interference in the environment anymore.
140 * Re-enable the enforcement of the NF maximum again.
143 cal->nfcal_interference = false;
146 static bool ath9k_hw_get_nf_thresh(struct ath_hw *ah,
147 enum ieee80211_band band,
151 case IEEE80211_BAND_5GHZ:
152 *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_5);
154 case IEEE80211_BAND_2GHZ:
155 *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_2);
165 void ath9k_hw_reset_calibration(struct ath_hw *ah,
166 struct ath9k_cal_list *currCal)
170 ath9k_hw_setup_calibration(ah, currCal);
172 currCal->calState = CAL_RUNNING;
174 for (i = 0; i < AR5416_MAX_CHAINS; i++) {
175 ah->meas0.sign[i] = 0;
176 ah->meas1.sign[i] = 0;
177 ah->meas2.sign[i] = 0;
178 ah->meas3.sign[i] = 0;
184 /* This is done for the currently configured channel */
185 bool ath9k_hw_reset_calvalid(struct ath_hw *ah)
187 struct ath_common *common = ath9k_hw_common(ah);
188 struct ieee80211_conf *conf = &common->hw->conf;
189 struct ath9k_cal_list *currCal = ah->cal_list_curr;
194 if (!AR_SREV_9100(ah) && !AR_SREV_9160_10_OR_LATER(ah))
200 if (currCal->calState != CAL_DONE) {
201 ath_dbg(common, ATH_DBG_CALIBRATE,
202 "Calibration state incorrect, %d\n",
207 if (!(ah->supp_cals & currCal->calData->calType))
210 ath_dbg(common, ATH_DBG_CALIBRATE,
211 "Resetting Cal %d state for channel %u\n",
212 currCal->calData->calType, conf->channel->center_freq);
214 ah->caldata->CalValid &= ~currCal->calData->calType;
215 currCal->calState = CAL_WAITING;
219 EXPORT_SYMBOL(ath9k_hw_reset_calvalid);
221 void ath9k_hw_start_nfcal(struct ath_hw *ah, bool update)
224 ah->caldata->nfcal_pending = true;
226 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
227 AR_PHY_AGC_CONTROL_ENABLE_NF);
230 REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
231 AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
233 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
234 AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
236 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
239 void ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
241 struct ath9k_nfcal_hist *h = NULL;
244 u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask;
245 struct ath_common *common = ath9k_hw_common(ah);
246 struct ieee80211_conf *conf = &common->hw->conf;
247 s16 default_nf = ath9k_hw_get_default_nf(ah, chan);
250 h = ah->caldata->nfCalHist;
252 for (i = 0; i < NUM_NF_READINGS; i++) {
253 if (chainmask & (1 << i)) {
256 if ((i >= AR5416_MAX_CHAINS) && !conf_is_ht40(conf))
264 val = REG_READ(ah, ah->nf_regs[i]);
266 val |= (((u32) nfval << 1) & 0x1ff);
267 REG_WRITE(ah, ah->nf_regs[i], val);
272 * Load software filtered NF value into baseband internal minCCApwr
275 REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
276 AR_PHY_AGC_CONTROL_ENABLE_NF);
277 REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
278 AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
279 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
282 * Wait for load to complete, should be fast, a few 10s of us.
283 * The max delay was changed from an original 250us to 10000us
284 * since 250us often results in NF load timeout and causes deaf
285 * condition during stress testing 12/12/2009
287 for (j = 0; j < 10000; j++) {
288 if ((REG_READ(ah, AR_PHY_AGC_CONTROL) &
289 AR_PHY_AGC_CONTROL_NF) == 0)
295 * We timed out waiting for the noisefloor to load, probably due to an
296 * in-progress rx. Simply return here and allow the load plenty of time
297 * to complete before the next calibration interval. We need to avoid
298 * trying to load -50 (which happens below) while the previous load is
299 * still in progress as this can cause rx deafness. Instead by returning
300 * here, the baseband nf cal will just be capped by our present
301 * noisefloor until the next calibration timer.
304 ath_dbg(common, ATH_DBG_ANY,
305 "Timeout while waiting for nf to load: AR_PHY_AGC_CONTROL=0x%x\n",
306 REG_READ(ah, AR_PHY_AGC_CONTROL));
311 * Restore maxCCAPower register parameter again so that we're not capped
312 * by the median we just loaded. This will be initial (and max) value
313 * of next noise floor calibration the baseband does.
315 ENABLE_REGWRITE_BUFFER(ah);
316 for (i = 0; i < NUM_NF_READINGS; i++) {
317 if (chainmask & (1 << i)) {
318 if ((i >= AR5416_MAX_CHAINS) && !conf_is_ht40(conf))
321 val = REG_READ(ah, ah->nf_regs[i]);
323 val |= (((u32) (-50) << 1) & 0x1ff);
324 REG_WRITE(ah, ah->nf_regs[i], val);
327 REGWRITE_BUFFER_FLUSH(ah);
331 static void ath9k_hw_nf_sanitize(struct ath_hw *ah, s16 *nf)
333 struct ath_common *common = ath9k_hw_common(ah);
334 struct ath_nf_limits *limit;
337 if (IS_CHAN_2GHZ(ah->curchan))
342 for (i = 0; i < NUM_NF_READINGS; i++) {
346 ath_dbg(common, ATH_DBG_CALIBRATE,
347 "NF calibrated [%s] [chain %d] is %d\n",
348 (i >= 3 ? "ext" : "ctl"), i % 3, nf[i]);
350 if (nf[i] > ATH9K_NF_TOO_HIGH) {
351 ath_dbg(common, ATH_DBG_CALIBRATE,
352 "NF[%d] (%d) > MAX (%d), correcting to MAX\n",
353 i, nf[i], ATH9K_NF_TOO_HIGH);
355 } else if (nf[i] < limit->min) {
356 ath_dbg(common, ATH_DBG_CALIBRATE,
357 "NF[%d] (%d) < MIN (%d), correcting to NOM\n",
358 i, nf[i], limit->min);
359 nf[i] = limit->nominal;
364 bool ath9k_hw_getnf(struct ath_hw *ah, struct ath9k_channel *chan)
366 struct ath_common *common = ath9k_hw_common(ah);
367 int16_t nf, nfThresh;
368 int16_t nfarray[NUM_NF_READINGS] = { 0 };
369 struct ath9k_nfcal_hist *h;
370 struct ieee80211_channel *c = chan->chan;
371 struct ath9k_hw_cal_data *caldata = ah->caldata;
373 chan->channelFlags &= (~CHANNEL_CW_INT);
374 if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) {
375 ath_dbg(common, ATH_DBG_CALIBRATE,
376 "NF did not complete in calibration window\n");
380 ath9k_hw_do_getnf(ah, nfarray);
381 ath9k_hw_nf_sanitize(ah, nfarray);
383 if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh)
385 ath_dbg(common, ATH_DBG_CALIBRATE,
386 "noise floor failed detected; detected %d, threshold %d\n",
388 chan->channelFlags |= CHANNEL_CW_INT;
392 chan->noisefloor = nf;
393 ah->noise = ath9k_hw_getchan_noise(ah, chan);
397 h = caldata->nfCalHist;
398 caldata->nfcal_pending = false;
399 ath9k_hw_update_nfcal_hist_buffer(ah, caldata, nfarray);
400 chan->noisefloor = h[0].privNF;
401 ah->noise = ath9k_hw_getchan_noise(ah, chan);
405 void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah,
406 struct ath9k_channel *chan)
408 struct ath9k_nfcal_hist *h;
412 ah->caldata->channel = chan->channel;
413 ah->caldata->channelFlags = chan->channelFlags & ~CHANNEL_CW_INT;
414 h = ah->caldata->nfCalHist;
415 default_nf = ath9k_hw_get_default_nf(ah, chan);
416 for (i = 0; i < NUM_NF_READINGS; i++) {
418 h[i].privNF = default_nf;
419 h[i].invalidNFcount = AR_PHY_CCA_FILTERWINDOW_LENGTH;
420 for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) {
421 h[i].nfCalBuffer[j] = default_nf;
427 void ath9k_hw_bstuck_nfcal(struct ath_hw *ah)
429 struct ath9k_hw_cal_data *caldata = ah->caldata;
431 if (unlikely(!caldata))
435 * If beacons are stuck, the most likely cause is interference.
436 * Triggering a noise floor calibration at this point helps the
437 * hardware adapt to a noisy environment much faster.
438 * To ensure that we recover from stuck beacons quickly, let
439 * the baseband update the internal NF value itself, similar to
440 * what is being done after a full reset.
442 if (!caldata->nfcal_pending)
443 ath9k_hw_start_nfcal(ah, true);
444 else if (!(REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF))
445 ath9k_hw_getnf(ah, ah->curchan);
447 caldata->nfcal_interference = true;
449 EXPORT_SYMBOL(ath9k_hw_bstuck_nfcal);