253 lines
6.4 KiB
C
253 lines
6.4 KiB
C
/*
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* Copyright (c) 2008-2009 Atheros Communications Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "hw.h"
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#include "hw-ops.h"
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/* Common calibration code */
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/* We can tune this as we go by monitoring really low values */
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#define ATH9K_NF_TOO_LOW -60
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/* AR5416 may return very high value (like -31 dBm), in those cases the nf
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* is incorrect and we should use the static NF value. Later we can try to
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* find out why they are reporting these values */
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static bool ath9k_hw_nf_in_range(struct ath_hw *ah, s16 nf)
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{
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if (nf > ATH9K_NF_TOO_LOW) {
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ath_print(ath9k_hw_common(ah), ATH_DBG_CALIBRATE,
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"noise floor value detected (%d) is "
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"lower than what we think is a "
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"reasonable value (%d)\n",
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nf, ATH9K_NF_TOO_LOW);
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return false;
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}
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return true;
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}
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static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer)
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{
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int16_t nfval;
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int16_t sort[ATH9K_NF_CAL_HIST_MAX];
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int i, j;
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for (i = 0; i < ATH9K_NF_CAL_HIST_MAX; i++)
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sort[i] = nfCalBuffer[i];
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for (i = 0; i < ATH9K_NF_CAL_HIST_MAX - 1; i++) {
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for (j = 1; j < ATH9K_NF_CAL_HIST_MAX - i; j++) {
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if (sort[j] > sort[j - 1]) {
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nfval = sort[j];
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sort[j] = sort[j - 1];
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sort[j - 1] = nfval;
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}
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}
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}
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nfval = sort[(ATH9K_NF_CAL_HIST_MAX - 1) >> 1];
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return nfval;
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}
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static void ath9k_hw_update_nfcal_hist_buffer(struct ath9k_nfcal_hist *h,
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int16_t *nfarray)
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{
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int i;
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for (i = 0; i < NUM_NF_READINGS; i++) {
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h[i].nfCalBuffer[h[i].currIndex] = nfarray[i];
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if (++h[i].currIndex >= ATH9K_NF_CAL_HIST_MAX)
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h[i].currIndex = 0;
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if (h[i].invalidNFcount > 0) {
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if (nfarray[i] < AR_PHY_CCA_MIN_BAD_VALUE ||
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nfarray[i] > AR_PHY_CCA_MAX_HIGH_VALUE) {
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h[i].invalidNFcount = ATH9K_NF_CAL_HIST_MAX;
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} else {
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h[i].invalidNFcount--;
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h[i].privNF = nfarray[i];
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}
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} else {
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h[i].privNF =
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ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer);
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}
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}
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return;
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}
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static bool ath9k_hw_get_nf_thresh(struct ath_hw *ah,
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enum ieee80211_band band,
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int16_t *nft)
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{
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switch (band) {
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case IEEE80211_BAND_5GHZ:
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*nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_5);
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break;
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case IEEE80211_BAND_2GHZ:
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*nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_2);
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break;
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default:
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BUG_ON(1);
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return false;
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}
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return true;
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}
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void ath9k_hw_reset_calibration(struct ath_hw *ah,
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struct ath9k_cal_list *currCal)
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{
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int i;
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ath9k_hw_setup_calibration(ah, currCal);
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currCal->calState = CAL_RUNNING;
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for (i = 0; i < AR5416_MAX_CHAINS; i++) {
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ah->meas0.sign[i] = 0;
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ah->meas1.sign[i] = 0;
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ah->meas2.sign[i] = 0;
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ah->meas3.sign[i] = 0;
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}
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ah->cal_samples = 0;
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}
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/* This is done for the currently configured channel */
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bool ath9k_hw_reset_calvalid(struct ath_hw *ah)
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{
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struct ath_common *common = ath9k_hw_common(ah);
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struct ieee80211_conf *conf = &common->hw->conf;
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struct ath9k_cal_list *currCal = ah->cal_list_curr;
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if (!ah->curchan)
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return true;
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if (!AR_SREV_9100(ah) && !AR_SREV_9160_10_OR_LATER(ah))
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return true;
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if (currCal == NULL)
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return true;
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if (currCal->calState != CAL_DONE) {
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ath_print(common, ATH_DBG_CALIBRATE,
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"Calibration state incorrect, %d\n",
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currCal->calState);
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return true;
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}
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if (!ath9k_hw_iscal_supported(ah, currCal->calData->calType))
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return true;
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ath_print(common, ATH_DBG_CALIBRATE,
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"Resetting Cal %d state for channel %u\n",
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currCal->calData->calType, conf->channel->center_freq);
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ah->curchan->CalValid &= ~currCal->calData->calType;
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currCal->calState = CAL_WAITING;
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return false;
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}
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EXPORT_SYMBOL(ath9k_hw_reset_calvalid);
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void ath9k_hw_start_nfcal(struct ath_hw *ah)
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{
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REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
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AR_PHY_AGC_CONTROL_ENABLE_NF);
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REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
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AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
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REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
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}
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int16_t ath9k_hw_getnf(struct ath_hw *ah,
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struct ath9k_channel *chan)
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{
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struct ath_common *common = ath9k_hw_common(ah);
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int16_t nf, nfThresh;
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int16_t nfarray[NUM_NF_READINGS] = { 0 };
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struct ath9k_nfcal_hist *h;
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struct ieee80211_channel *c = chan->chan;
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chan->channelFlags &= (~CHANNEL_CW_INT);
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if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) {
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ath_print(common, ATH_DBG_CALIBRATE,
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"NF did not complete in calibration window\n");
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nf = 0;
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chan->rawNoiseFloor = nf;
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return chan->rawNoiseFloor;
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} else {
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ath9k_hw_do_getnf(ah, nfarray);
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nf = nfarray[0];
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if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh)
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&& nf > nfThresh) {
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ath_print(common, ATH_DBG_CALIBRATE,
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"noise floor failed detected; "
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"detected %d, threshold %d\n",
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nf, nfThresh);
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chan->channelFlags |= CHANNEL_CW_INT;
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}
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}
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h = ah->nfCalHist;
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ath9k_hw_update_nfcal_hist_buffer(h, nfarray);
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chan->rawNoiseFloor = h[0].privNF;
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return chan->rawNoiseFloor;
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}
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void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah)
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{
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int i, j;
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s16 noise_floor;
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if (AR_SREV_9280(ah))
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noise_floor = AR_PHY_CCA_MAX_AR9280_GOOD_VALUE;
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else if (AR_SREV_9285(ah) || AR_SREV_9271(ah))
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noise_floor = AR_PHY_CCA_MAX_AR9285_GOOD_VALUE;
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else if (AR_SREV_9287(ah))
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noise_floor = AR_PHY_CCA_MAX_AR9287_GOOD_VALUE;
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else
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noise_floor = AR_PHY_CCA_MAX_AR5416_GOOD_VALUE;
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for (i = 0; i < NUM_NF_READINGS; i++) {
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ah->nfCalHist[i].currIndex = 0;
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ah->nfCalHist[i].privNF = noise_floor;
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ah->nfCalHist[i].invalidNFcount =
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AR_PHY_CCA_FILTERWINDOW_LENGTH;
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for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) {
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ah->nfCalHist[i].nfCalBuffer[j] = noise_floor;
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}
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}
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}
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s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan)
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{
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s16 nf;
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if (chan->rawNoiseFloor == 0)
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nf = -96;
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else
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nf = chan->rawNoiseFloor;
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if (!ath9k_hw_nf_in_range(ah, nf))
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nf = ATH_DEFAULT_NOISE_FLOOR;
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return nf;
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}
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EXPORT_SYMBOL(ath9k_hw_getchan_noise);
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