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 if (nfarray[i] < AR_PHY_CCA_MIN_BAD_VALUE ||
78 nfarray[i] > AR_PHY_CCA_MAX_HIGH_VALUE) {
79 h[i].invalidNFcount = ATH9K_NF_CAL_HIST_MAX;
81 h[i].invalidNFcount--;
82 h[i].privNF = nfarray[i];
86 ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer);
92 static bool ath9k_hw_get_nf_thresh(struct ath_hw *ah,
93 enum ieee80211_band band,
97 case IEEE80211_BAND_5GHZ:
98 *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_5);
100 case IEEE80211_BAND_2GHZ:
101 *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_2);
111 void ath9k_hw_reset_calibration(struct ath_hw *ah,
112 struct ath9k_cal_list *currCal)
116 ath9k_hw_setup_calibration(ah, currCal);
118 currCal->calState = CAL_RUNNING;
120 for (i = 0; i < AR5416_MAX_CHAINS; i++) {
121 ah->meas0.sign[i] = 0;
122 ah->meas1.sign[i] = 0;
123 ah->meas2.sign[i] = 0;
124 ah->meas3.sign[i] = 0;
130 /* This is done for the currently configured channel */
131 bool ath9k_hw_reset_calvalid(struct ath_hw *ah)
133 struct ath_common *common = ath9k_hw_common(ah);
134 struct ieee80211_conf *conf = &common->hw->conf;
135 struct ath9k_cal_list *currCal = ah->cal_list_curr;
140 if (!AR_SREV_9100(ah) && !AR_SREV_9160_10_OR_LATER(ah))
146 if (currCal->calState != CAL_DONE) {
147 ath_print(common, ATH_DBG_CALIBRATE,
148 "Calibration state incorrect, %d\n",
153 if (!ath9k_hw_iscal_supported(ah, currCal->calData->calType))
156 ath_print(common, ATH_DBG_CALIBRATE,
157 "Resetting Cal %d state for channel %u\n",
158 currCal->calData->calType, conf->channel->center_freq);
160 ah->curchan->CalValid &= ~currCal->calData->calType;
161 currCal->calState = CAL_WAITING;
165 EXPORT_SYMBOL(ath9k_hw_reset_calvalid);
167 void ath9k_hw_start_nfcal(struct ath_hw *ah)
169 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
170 AR_PHY_AGC_CONTROL_ENABLE_NF);
171 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
172 AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
173 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
176 int16_t ath9k_hw_getnf(struct ath_hw *ah,
177 struct ath9k_channel *chan)
179 struct ath_common *common = ath9k_hw_common(ah);
180 int16_t nf, nfThresh;
181 int16_t nfarray[NUM_NF_READINGS] = { 0 };
182 struct ath9k_nfcal_hist *h;
183 struct ieee80211_channel *c = chan->chan;
185 chan->channelFlags &= (~CHANNEL_CW_INT);
186 if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) {
187 ath_print(common, ATH_DBG_CALIBRATE,
188 "NF did not complete in calibration window\n");
190 chan->rawNoiseFloor = nf;
191 return chan->rawNoiseFloor;
193 ath9k_hw_do_getnf(ah, nfarray);
195 if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh)
197 ath_print(common, ATH_DBG_CALIBRATE,
198 "noise floor failed detected; "
199 "detected %d, threshold %d\n",
201 chan->channelFlags |= CHANNEL_CW_INT;
207 ath9k_hw_update_nfcal_hist_buffer(h, nfarray);
208 chan->rawNoiseFloor = h[0].privNF;
210 return chan->rawNoiseFloor;
213 void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah)
218 if (AR_SREV_9280(ah))
219 noise_floor = AR_PHY_CCA_MAX_AR9280_GOOD_VALUE;
220 else if (AR_SREV_9285(ah) || AR_SREV_9271(ah))
221 noise_floor = AR_PHY_CCA_MAX_AR9285_GOOD_VALUE;
222 else if (AR_SREV_9287(ah))
223 noise_floor = AR_PHY_CCA_MAX_AR9287_GOOD_VALUE;
225 noise_floor = AR_PHY_CCA_MAX_AR5416_GOOD_VALUE;
227 for (i = 0; i < NUM_NF_READINGS; i++) {
228 ah->nfCalHist[i].currIndex = 0;
229 ah->nfCalHist[i].privNF = noise_floor;
230 ah->nfCalHist[i].invalidNFcount =
231 AR_PHY_CCA_FILTERWINDOW_LENGTH;
232 for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) {
233 ah->nfCalHist[i].nfCalBuffer[j] = noise_floor;
238 s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan)
242 if (chan->rawNoiseFloor == 0)
245 nf = chan->rawNoiseFloor;
247 if (!ath9k_hw_nf_in_range(ah, nf))
248 nf = ATH_DEFAULT_NOISE_FLOOR;
252 EXPORT_SYMBOL(ath9k_hw_getchan_noise);