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);
91 static bool ath9k_hw_get_nf_thresh(struct ath_hw *ah,
92 enum ieee80211_band band,
96 case IEEE80211_BAND_5GHZ:
97 *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_5);
99 case IEEE80211_BAND_2GHZ:
100 *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_2);
110 void ath9k_hw_reset_calibration(struct ath_hw *ah,
111 struct ath9k_cal_list *currCal)
115 ath9k_hw_setup_calibration(ah, currCal);
117 currCal->calState = CAL_RUNNING;
119 for (i = 0; i < AR5416_MAX_CHAINS; i++) {
120 ah->meas0.sign[i] = 0;
121 ah->meas1.sign[i] = 0;
122 ah->meas2.sign[i] = 0;
123 ah->meas3.sign[i] = 0;
129 /* This is done for the currently configured channel */
130 bool ath9k_hw_reset_calvalid(struct ath_hw *ah)
132 struct ath_common *common = ath9k_hw_common(ah);
133 struct ieee80211_conf *conf = &common->hw->conf;
134 struct ath9k_cal_list *currCal = ah->cal_list_curr;
139 if (!AR_SREV_9100(ah) && !AR_SREV_9160_10_OR_LATER(ah))
145 if (currCal->calState != CAL_DONE) {
146 ath_print(common, ATH_DBG_CALIBRATE,
147 "Calibration state incorrect, %d\n",
152 if (!ath9k_hw_iscal_supported(ah, currCal->calData->calType))
155 ath_print(common, ATH_DBG_CALIBRATE,
156 "Resetting Cal %d state for channel %u\n",
157 currCal->calData->calType, conf->channel->center_freq);
159 ah->curchan->CalValid &= ~currCal->calData->calType;
160 currCal->calState = CAL_WAITING;
164 EXPORT_SYMBOL(ath9k_hw_reset_calvalid);
166 void ath9k_hw_start_nfcal(struct ath_hw *ah)
168 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
169 AR_PHY_AGC_CONTROL_ENABLE_NF);
170 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
171 AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
172 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
175 int16_t ath9k_hw_getnf(struct ath_hw *ah,
176 struct ath9k_channel *chan)
178 struct ath_common *common = ath9k_hw_common(ah);
179 int16_t nf, nfThresh;
180 int16_t nfarray[NUM_NF_READINGS] = { 0 };
181 struct ath9k_nfcal_hist *h;
182 struct ieee80211_channel *c = chan->chan;
184 chan->channelFlags &= (~CHANNEL_CW_INT);
185 if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) {
186 ath_print(common, ATH_DBG_CALIBRATE,
187 "NF did not complete in calibration window\n");
189 chan->rawNoiseFloor = nf;
190 return chan->rawNoiseFloor;
192 ath9k_hw_do_getnf(ah, nfarray);
194 if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh)
196 ath_print(common, ATH_DBG_CALIBRATE,
197 "noise floor failed detected; "
198 "detected %d, threshold %d\n",
200 chan->channelFlags |= CHANNEL_CW_INT;
206 ath9k_hw_update_nfcal_hist_buffer(h, nfarray);
207 chan->rawNoiseFloor = h[0].privNF;
209 return chan->rawNoiseFloor;
212 void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah)
217 if (AR_SREV_9280(ah))
218 noise_floor = AR_PHY_CCA_MAX_AR9280_GOOD_VALUE;
219 else if (AR_SREV_9285(ah) || AR_SREV_9271(ah))
220 noise_floor = AR_PHY_CCA_MAX_AR9285_GOOD_VALUE;
221 else if (AR_SREV_9287(ah))
222 noise_floor = AR_PHY_CCA_MAX_AR9287_GOOD_VALUE;
224 noise_floor = AR_PHY_CCA_MAX_AR5416_GOOD_VALUE;
226 for (i = 0; i < NUM_NF_READINGS; i++) {
227 ah->nfCalHist[i].currIndex = 0;
228 ah->nfCalHist[i].privNF = noise_floor;
229 ah->nfCalHist[i].invalidNFcount =
230 AR_PHY_CCA_FILTERWINDOW_LENGTH;
231 for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) {
232 ah->nfCalHist[i].nfCalBuffer[j] = noise_floor;
237 s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan)
241 if (chan->rawNoiseFloor == 0)
244 nf = chan->rawNoiseFloor;
246 if (!ath9k_hw_nf_in_range(ah, nf))
247 nf = ATH_DEFAULT_NOISE_FLOOR;
251 EXPORT_SYMBOL(ath9k_hw_getchan_noise);