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, bool update)
163 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
164 AR_PHY_AGC_CONTROL_ENABLE_NF);
167 REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
168 AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
170 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
171 AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
173 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
176 void ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
178 struct ath9k_nfcal_hist *h;
181 u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask;
182 struct ath_common *common = ath9k_hw_common(ah);
186 for (i = 0; i < NUM_NF_READINGS; i++) {
187 if (chainmask & (1 << i)) {
188 val = REG_READ(ah, ah->nf_regs[i]);
190 val |= (((u32) (h[i].privNF) << 1) & 0x1ff);
191 REG_WRITE(ah, ah->nf_regs[i], val);
196 * Load software filtered NF value into baseband internal minCCApwr
199 REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
200 AR_PHY_AGC_CONTROL_ENABLE_NF);
201 REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
202 AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
203 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
206 * Wait for load to complete, should be fast, a few 10s of us.
207 * The max delay was changed from an original 250us to 10000us
208 * since 250us often results in NF load timeout and causes deaf
209 * condition during stress testing 12/12/2009
211 for (j = 0; j < 1000; j++) {
212 if ((REG_READ(ah, AR_PHY_AGC_CONTROL) &
213 AR_PHY_AGC_CONTROL_NF) == 0)
219 * We timed out waiting for the noisefloor to load, probably due to an
220 * in-progress rx. Simply return here and allow the load plenty of time
221 * to complete before the next calibration interval. We need to avoid
222 * trying to load -50 (which happens below) while the previous load is
223 * still in progress as this can cause rx deafness. Instead by returning
224 * here, the baseband nf cal will just be capped by our present
225 * noisefloor until the next calibration timer.
228 ath_print(common, ATH_DBG_ANY, "Timeout while waiting for nf "
229 "to load: AR_PHY_AGC_CONTROL=0x%x\n",
230 REG_READ(ah, AR_PHY_AGC_CONTROL));
235 * Restore maxCCAPower register parameter again so that we're not capped
236 * by the median we just loaded. This will be initial (and max) value
237 * of next noise floor calibration the baseband does.
239 ENABLE_REGWRITE_BUFFER(ah);
240 for (i = 0; i < NUM_NF_READINGS; i++) {
241 if (chainmask & (1 << i)) {
242 val = REG_READ(ah, ah->nf_regs[i]);
244 val |= (((u32) (-50) << 1) & 0x1ff);
245 REG_WRITE(ah, ah->nf_regs[i], val);
248 REGWRITE_BUFFER_FLUSH(ah);
249 DISABLE_REGWRITE_BUFFER(ah);
253 static void ath9k_hw_nf_sanitize(struct ath_hw *ah, s16 *nf)
255 struct ath_common *common = ath9k_hw_common(ah);
256 struct ath_nf_limits *limit;
259 if (IS_CHAN_2GHZ(ah->curchan))
264 for (i = 0; i < NUM_NF_READINGS; i++) {
268 ath_print(common, ATH_DBG_CALIBRATE,
269 "NF calibrated [%s] [chain %d] is %d\n",
270 (i >= 3 ? "ext" : "ctl"), i % 3, nf[i]);
272 if (nf[i] > limit->max) {
273 ath_print(common, ATH_DBG_CALIBRATE,
274 "NF[%d] (%d) > MAX (%d), correcting to MAX",
275 i, nf[i], limit->max);
277 } else if (nf[i] < limit->min) {
278 ath_print(common, ATH_DBG_CALIBRATE,
279 "NF[%d] (%d) < MIN (%d), correcting to NOM",
280 i, nf[i], limit->min);
281 nf[i] = limit->nominal;
286 int16_t ath9k_hw_getnf(struct ath_hw *ah,
287 struct ath9k_channel *chan)
289 struct ath_common *common = ath9k_hw_common(ah);
290 int16_t nf, nfThresh;
291 int16_t nfarray[NUM_NF_READINGS] = { 0 };
292 struct ath9k_nfcal_hist *h;
293 struct ieee80211_channel *c = chan->chan;
295 chan->channelFlags &= (~CHANNEL_CW_INT);
296 if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) {
297 ath_print(common, ATH_DBG_CALIBRATE,
298 "NF did not complete in calibration window\n");
300 chan->rawNoiseFloor = nf;
301 return chan->rawNoiseFloor;
303 ath9k_hw_do_getnf(ah, nfarray);
304 ath9k_hw_nf_sanitize(ah, nfarray);
306 if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh)
308 ath_print(common, ATH_DBG_CALIBRATE,
309 "noise floor failed detected; "
310 "detected %d, threshold %d\n",
312 chan->channelFlags |= CHANNEL_CW_INT;
318 ath9k_hw_update_nfcal_hist_buffer(h, nfarray);
319 chan->rawNoiseFloor = h[0].privNF;
321 return chan->rawNoiseFloor;
324 void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah)
326 struct ath_nf_limits *limit;
329 if (!ah->curchan || IS_CHAN_2GHZ(ah->curchan))
334 for (i = 0; i < NUM_NF_READINGS; i++) {
335 ah->nfCalHist[i].currIndex = 0;
336 ah->nfCalHist[i].privNF = limit->nominal;
337 ah->nfCalHist[i].invalidNFcount =
338 AR_PHY_CCA_FILTERWINDOW_LENGTH;
339 for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) {
340 ah->nfCalHist[i].nfCalBuffer[j] = limit->nominal;
345 s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan)
349 if (chan->rawNoiseFloor == 0)
352 nf = chan->rawNoiseFloor;
354 if (!ath9k_hw_nf_in_range(ah, nf))
355 nf = ATH_DEFAULT_NOISE_FLOOR;
359 EXPORT_SYMBOL(ath9k_hw_getchan_noise);