2 * Copyright (c) 2008-2009 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 /* We can tune this as we go by monitoring really low values */
23 #define ATH9K_NF_TOO_LOW -60
25 /* AR5416 may return very high value (like -31 dBm), in those cases the nf
26 * is incorrect and we should use the static NF value. Later we can try to
27 * find out why they are reporting these values */
29 static bool ath9k_hw_nf_in_range(struct ath_hw *ah, s16 nf)
31 if (nf > ATH9K_NF_TOO_LOW) {
32 ath_print(ath9k_hw_common(ah), ATH_DBG_CALIBRATE,
33 "noise floor value detected (%d) is "
34 "lower than what we think is a "
35 "reasonable value (%d)\n",
36 nf, ATH9K_NF_TOO_LOW);
42 static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer)
45 int16_t sort[ATH9K_NF_CAL_HIST_MAX];
48 for (i = 0; i < ATH9K_NF_CAL_HIST_MAX; i++)
49 sort[i] = nfCalBuffer[i];
51 for (i = 0; i < ATH9K_NF_CAL_HIST_MAX - 1; i++) {
52 for (j = 1; j < ATH9K_NF_CAL_HIST_MAX - i; j++) {
53 if (sort[j] > sort[j - 1]) {
55 sort[j] = sort[j - 1];
60 nfval = sort[(ATH9K_NF_CAL_HIST_MAX - 1) >> 1];
65 static void ath9k_hw_update_nfcal_hist_buffer(struct ath9k_nfcal_hist *h,
70 for (i = 0; i < NUM_NF_READINGS; i++) {
71 h[i].nfCalBuffer[h[i].currIndex] = nfarray[i];
73 if (++h[i].currIndex >= ATH9K_NF_CAL_HIST_MAX)
76 if (h[i].invalidNFcount > 0) {
77 h[i].invalidNFcount--;
78 h[i].privNF = nfarray[i];
81 ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer);
86 static bool ath9k_hw_get_nf_thresh(struct ath_hw *ah,
87 enum ieee80211_band band,
91 case IEEE80211_BAND_5GHZ:
92 *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_5);
94 case IEEE80211_BAND_2GHZ:
95 *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_2);
105 void ath9k_hw_reset_calibration(struct ath_hw *ah,
106 struct ath9k_cal_list *currCal)
110 ath9k_hw_setup_calibration(ah, currCal);
112 currCal->calState = CAL_RUNNING;
114 for (i = 0; i < AR5416_MAX_CHAINS; i++) {
115 ah->meas0.sign[i] = 0;
116 ah->meas1.sign[i] = 0;
117 ah->meas2.sign[i] = 0;
118 ah->meas3.sign[i] = 0;
124 /* This is done for the currently configured channel */
125 bool ath9k_hw_reset_calvalid(struct ath_hw *ah)
127 struct ath_common *common = ath9k_hw_common(ah);
128 struct ieee80211_conf *conf = &common->hw->conf;
129 struct ath9k_cal_list *currCal = ah->cal_list_curr;
134 if (!AR_SREV_9100(ah) && !AR_SREV_9160_10_OR_LATER(ah))
140 if (currCal->calState != CAL_DONE) {
141 ath_print(common, ATH_DBG_CALIBRATE,
142 "Calibration state incorrect, %d\n",
147 if (!ath9k_hw_iscal_supported(ah, currCal->calData->calType))
150 ath_print(common, ATH_DBG_CALIBRATE,
151 "Resetting Cal %d state for channel %u\n",
152 currCal->calData->calType, conf->channel->center_freq);
154 ah->curchan->CalValid &= ~currCal->calData->calType;
155 currCal->calState = CAL_WAITING;
159 EXPORT_SYMBOL(ath9k_hw_reset_calvalid);
161 void ath9k_hw_start_nfcal(struct ath_hw *ah)
163 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
164 AR_PHY_AGC_CONTROL_ENABLE_NF);
165 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
166 AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
167 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
170 void ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
172 struct ath9k_nfcal_hist *h;
176 struct ath_common *common = ath9k_hw_common(ah);
178 if (AR_SREV_9300_20_OR_LATER(ah))
180 else if (AR_SREV_9285(ah) || AR_SREV_9271(ah))
182 else if (AR_SREV_9280(ah) || AR_SREV_9287(ah)) {
183 if ((ah->rxchainmask & 0x2) || (ah->rxchainmask & 0x4))
188 if (ah->rxchainmask & 0x4)
190 else if (ah->rxchainmask & 0x2)
197 for (i = 0; i < NUM_NF_READINGS; i++) {
198 if (chainmask & (1 << i)) {
199 val = REG_READ(ah, ah->nf_regs[i]);
201 val |= (((u32) (h[i].privNF) << 1) & 0x1ff);
202 REG_WRITE(ah, ah->nf_regs[i], val);
207 * Load software filtered NF value into baseband internal minCCApwr
210 REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
211 AR_PHY_AGC_CONTROL_ENABLE_NF);
212 REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
213 AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
214 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
217 * Wait for load to complete, should be fast, a few 10s of us.
218 * The max delay was changed from an original 250us to 10000us
219 * since 250us often results in NF load timeout and causes deaf
220 * condition during stress testing 12/12/2009
222 for (j = 0; j < 1000; j++) {
223 if ((REG_READ(ah, AR_PHY_AGC_CONTROL) &
224 AR_PHY_AGC_CONTROL_NF) == 0)
230 * We timed out waiting for the noisefloor to load, probably due to an
231 * in-progress rx. Simply return here and allow the load plenty of time
232 * to complete before the next calibration interval. We need to avoid
233 * trying to load -50 (which happens below) while the previous load is
234 * still in progress as this can cause rx deafness. Instead by returning
235 * here, the baseband nf cal will just be capped by our present
236 * noisefloor until the next calibration timer.
239 ath_print(common, ATH_DBG_ANY, "Timeout while waiting for nf "
240 "to load: AR_PHY_AGC_CONTROL=0x%x\n",
241 REG_READ(ah, AR_PHY_AGC_CONTROL));
246 * Restore maxCCAPower register parameter again so that we're not capped
247 * by the median we just loaded. This will be initial (and max) value
248 * of next noise floor calibration the baseband does.
250 ENABLE_REGWRITE_BUFFER(ah);
251 for (i = 0; i < NUM_NF_READINGS; i++) {
252 if (chainmask & (1 << i)) {
253 val = REG_READ(ah, ah->nf_regs[i]);
255 val |= (((u32) (-50) << 1) & 0x1ff);
256 REG_WRITE(ah, ah->nf_regs[i], val);
259 REGWRITE_BUFFER_FLUSH(ah);
260 DISABLE_REGWRITE_BUFFER(ah);
264 static void ath9k_hw_nf_sanitize(struct ath_hw *ah, s16 *nf)
266 struct ath_common *common = ath9k_hw_common(ah);
267 struct ath_nf_limits *limit;
270 if (IS_CHAN_2GHZ(ah->curchan))
275 for (i = 0; i < NUM_NF_READINGS; i++) {
279 ath_print(common, ATH_DBG_CALIBRATE,
280 "NF calibrated [%s] [chain %d] is %d\n",
281 (i > 3 ? "ext" : "ctl"), i % 3, nf[i]);
283 if (nf[i] > limit->max) {
284 ath_print(common, ATH_DBG_CALIBRATE,
285 "NF[%d] (%d) > MAX (%d), correcting to MAX",
286 i, nf[i], limit->max);
288 } else if (nf[i] < limit->min) {
289 ath_print(common, ATH_DBG_CALIBRATE,
290 "NF[%d] (%d) < MIN (%d), correcting to NOM",
291 i, nf[i], limit->min);
292 nf[i] = limit->nominal;
297 int16_t ath9k_hw_getnf(struct ath_hw *ah,
298 struct ath9k_channel *chan)
300 struct ath_common *common = ath9k_hw_common(ah);
301 int16_t nf, nfThresh;
302 int16_t nfarray[NUM_NF_READINGS] = { 0 };
303 struct ath9k_nfcal_hist *h;
304 struct ieee80211_channel *c = chan->chan;
306 chan->channelFlags &= (~CHANNEL_CW_INT);
307 if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) {
308 ath_print(common, ATH_DBG_CALIBRATE,
309 "NF did not complete in calibration window\n");
311 chan->rawNoiseFloor = nf;
312 return chan->rawNoiseFloor;
314 ath9k_hw_do_getnf(ah, nfarray);
315 ath9k_hw_nf_sanitize(ah, nfarray);
317 if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh)
319 ath_print(common, ATH_DBG_CALIBRATE,
320 "noise floor failed detected; "
321 "detected %d, threshold %d\n",
323 chan->channelFlags |= CHANNEL_CW_INT;
329 ath9k_hw_update_nfcal_hist_buffer(h, nfarray);
330 chan->rawNoiseFloor = h[0].privNF;
332 return chan->rawNoiseFloor;
335 void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah)
337 struct ath_nf_limits *limit;
340 if (!ah->curchan || IS_CHAN_2GHZ(ah->curchan))
345 for (i = 0; i < NUM_NF_READINGS; i++) {
346 ah->nfCalHist[i].currIndex = 0;
347 ah->nfCalHist[i].privNF = limit->nominal;
348 ah->nfCalHist[i].invalidNFcount =
349 AR_PHY_CCA_FILTERWINDOW_LENGTH;
350 for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) {
351 ah->nfCalHist[i].nfCalBuffer[j] = limit->nominal;
356 s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan)
360 if (chan->rawNoiseFloor == 0)
363 nf = chan->rawNoiseFloor;
365 if (!ath9k_hw_nf_in_range(ah, nf))
366 nf = ATH_DEFAULT_NOISE_FLOOR;
370 EXPORT_SYMBOL(ath9k_hw_getchan_noise);