| /* |
| * Copyright (c) 2008-2011 Atheros Communications Inc. |
| * |
| * Permission to use, copy, modify, and/or distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| #include "hw.h" |
| #include "hw-ops.h" |
| #include <linux/export.h> |
| |
| /* Common calibration code */ |
| |
| |
| static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer) |
| { |
| int16_t nfval; |
| int16_t sort[ATH9K_NF_CAL_HIST_MAX]; |
| int i, j; |
| |
| for (i = 0; i < ATH9K_NF_CAL_HIST_MAX; i++) |
| sort[i] = nfCalBuffer[i]; |
| |
| for (i = 0; i < ATH9K_NF_CAL_HIST_MAX - 1; i++) { |
| for (j = 1; j < ATH9K_NF_CAL_HIST_MAX - i; j++) { |
| if (sort[j] > sort[j - 1]) { |
| nfval = sort[j]; |
| sort[j] = sort[j - 1]; |
| sort[j - 1] = nfval; |
| } |
| } |
| } |
| nfval = sort[(ATH9K_NF_CAL_HIST_MAX - 1) >> 1]; |
| |
| return nfval; |
| } |
| |
| static struct ath_nf_limits *ath9k_hw_get_nf_limits(struct ath_hw *ah, |
| struct ath9k_channel *chan) |
| { |
| struct ath_nf_limits *limit; |
| |
| if (!chan || IS_CHAN_2GHZ(chan)) |
| limit = &ah->nf_2g; |
| else |
| limit = &ah->nf_5g; |
| |
| return limit; |
| } |
| |
| static s16 ath9k_hw_get_default_nf(struct ath_hw *ah, |
| struct ath9k_channel *chan) |
| { |
| return ath9k_hw_get_nf_limits(ah, chan)->nominal; |
| } |
| |
| s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan, |
| s16 nf) |
| { |
| s8 noise = ATH_DEFAULT_NOISE_FLOOR; |
| |
| if (nf) { |
| s8 delta = nf - ATH9K_NF_CAL_NOISE_THRESH - |
| ath9k_hw_get_default_nf(ah, chan); |
| if (delta > 0) |
| noise += delta; |
| } |
| return noise; |
| } |
| EXPORT_SYMBOL(ath9k_hw_getchan_noise); |
| |
| static void ath9k_hw_update_nfcal_hist_buffer(struct ath_hw *ah, |
| struct ath9k_hw_cal_data *cal, |
| int16_t *nfarray) |
| { |
| struct ath_common *common = ath9k_hw_common(ah); |
| struct ath_nf_limits *limit; |
| struct ath9k_nfcal_hist *h; |
| bool high_nf_mid = false; |
| u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask; |
| int i; |
| |
| h = cal->nfCalHist; |
| limit = ath9k_hw_get_nf_limits(ah, ah->curchan); |
| |
| for (i = 0; i < NUM_NF_READINGS; i++) { |
| if (!(chainmask & (1 << i)) || |
| ((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(ah->curchan))) |
| continue; |
| |
| h[i].nfCalBuffer[h[i].currIndex] = nfarray[i]; |
| |
| if (++h[i].currIndex >= ATH9K_NF_CAL_HIST_MAX) |
| h[i].currIndex = 0; |
| |
| if (h[i].invalidNFcount > 0) { |
| h[i].invalidNFcount--; |
| h[i].privNF = nfarray[i]; |
| } else { |
| h[i].privNF = |
| ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer); |
| } |
| |
| if (!h[i].privNF) |
| continue; |
| |
| if (h[i].privNF > limit->max) { |
| high_nf_mid = true; |
| |
| ath_dbg(common, CALIBRATE, |
| "NFmid[%d] (%d) > MAX (%d), %s\n", |
| i, h[i].privNF, limit->max, |
| (test_bit(NFCAL_INTF, &cal->cal_flags) ? |
| "not corrected (due to interference)" : |
| "correcting to MAX")); |
| |
| /* |
| * Normally we limit the average noise floor by the |
| * hardware specific maximum here. However if we have |
| * encountered stuck beacons because of interference, |
| * we bypass this limit here in order to better deal |
| * with our environment. |
| */ |
| if (!test_bit(NFCAL_INTF, &cal->cal_flags)) |
| h[i].privNF = limit->max; |
| } |
| } |
| |
| /* |
| * If the noise floor seems normal for all chains, assume that |
| * there is no significant interference in the environment anymore. |
| * Re-enable the enforcement of the NF maximum again. |
| */ |
| if (!high_nf_mid) |
| clear_bit(NFCAL_INTF, &cal->cal_flags); |
| } |
| |
| static bool ath9k_hw_get_nf_thresh(struct ath_hw *ah, |
| enum ieee80211_band band, |
| int16_t *nft) |
| { |
| switch (band) { |
| case IEEE80211_BAND_5GHZ: |
| *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_5); |
| break; |
| case IEEE80211_BAND_2GHZ: |
| *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_2); |
| break; |
| default: |
| BUG_ON(1); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void ath9k_hw_reset_calibration(struct ath_hw *ah, |
| struct ath9k_cal_list *currCal) |
| { |
| int i; |
| |
| ath9k_hw_setup_calibration(ah, currCal); |
| |
| currCal->calState = CAL_RUNNING; |
| |
| for (i = 0; i < AR5416_MAX_CHAINS; i++) { |
| ah->meas0.sign[i] = 0; |
| ah->meas1.sign[i] = 0; |
| ah->meas2.sign[i] = 0; |
| ah->meas3.sign[i] = 0; |
| } |
| |
| ah->cal_samples = 0; |
| } |
| |
| /* This is done for the currently configured channel */ |
| bool ath9k_hw_reset_calvalid(struct ath_hw *ah) |
| { |
| struct ath_common *common = ath9k_hw_common(ah); |
| struct ath9k_cal_list *currCal = ah->cal_list_curr; |
| |
| if (!ah->caldata) |
| return true; |
| |
| if (!AR_SREV_9100(ah) && !AR_SREV_9160_10_OR_LATER(ah)) |
| return true; |
| |
| if (currCal == NULL) |
| return true; |
| |
| if (currCal->calState != CAL_DONE) { |
| ath_dbg(common, CALIBRATE, "Calibration state incorrect, %d\n", |
| currCal->calState); |
| return true; |
| } |
| |
| if (!(ah->supp_cals & currCal->calData->calType)) |
| return true; |
| |
| ath_dbg(common, CALIBRATE, "Resetting Cal %d state for channel %u\n", |
| currCal->calData->calType, ah->curchan->chan->center_freq); |
| |
| ah->caldata->CalValid &= ~currCal->calData->calType; |
| currCal->calState = CAL_WAITING; |
| |
| return false; |
| } |
| EXPORT_SYMBOL(ath9k_hw_reset_calvalid); |
| |
| void ath9k_hw_start_nfcal(struct ath_hw *ah, bool update) |
| { |
| if (ah->caldata) |
| set_bit(NFCAL_PENDING, &ah->caldata->cal_flags); |
| |
| REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, |
| AR_PHY_AGC_CONTROL_ENABLE_NF); |
| |
| if (update) |
| REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, |
| AR_PHY_AGC_CONTROL_NO_UPDATE_NF); |
| else |
| REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, |
| AR_PHY_AGC_CONTROL_NO_UPDATE_NF); |
| |
| REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); |
| } |
| |
| int ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan) |
| { |
| struct ath9k_nfcal_hist *h = NULL; |
| unsigned i, j; |
| int32_t val; |
| u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask; |
| struct ath_common *common = ath9k_hw_common(ah); |
| s16 default_nf = ath9k_hw_get_default_nf(ah, chan); |
| |
| if (ah->caldata) |
| h = ah->caldata->nfCalHist; |
| |
| for (i = 0; i < NUM_NF_READINGS; i++) { |
| if (chainmask & (1 << i)) { |
| s16 nfval; |
| |
| if ((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(chan)) |
| continue; |
| |
| if (h) |
| nfval = h[i].privNF; |
| else |
| nfval = default_nf; |
| |
| val = REG_READ(ah, ah->nf_regs[i]); |
| val &= 0xFFFFFE00; |
| val |= (((u32) nfval << 1) & 0x1ff); |
| REG_WRITE(ah, ah->nf_regs[i], val); |
| } |
| } |
| |
| /* |
| * Load software filtered NF value into baseband internal minCCApwr |
| * variable. |
| */ |
| REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, |
| AR_PHY_AGC_CONTROL_ENABLE_NF); |
| REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, |
| AR_PHY_AGC_CONTROL_NO_UPDATE_NF); |
| REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); |
| |
| /* |
| * Wait for load to complete, should be fast, a few 10s of us. |
| * The max delay was changed from an original 250us to 10000us |
| * since 250us often results in NF load timeout and causes deaf |
| * condition during stress testing 12/12/2009 |
| */ |
| for (j = 0; j < 10000; j++) { |
| if ((REG_READ(ah, AR_PHY_AGC_CONTROL) & |
| AR_PHY_AGC_CONTROL_NF) == 0) |
| break; |
| udelay(10); |
| } |
| |
| /* |
| * We timed out waiting for the noisefloor to load, probably due to an |
| * in-progress rx. Simply return here and allow the load plenty of time |
| * to complete before the next calibration interval. We need to avoid |
| * trying to load -50 (which happens below) while the previous load is |
| * still in progress as this can cause rx deafness. Instead by returning |
| * here, the baseband nf cal will just be capped by our present |
| * noisefloor until the next calibration timer. |
| */ |
| if (j == 10000) { |
| ath_dbg(common, ANY, |
| "Timeout while waiting for nf to load: AR_PHY_AGC_CONTROL=0x%x\n", |
| REG_READ(ah, AR_PHY_AGC_CONTROL)); |
| return -ETIMEDOUT; |
| } |
| |
| /* |
| * Restore maxCCAPower register parameter again so that we're not capped |
| * by the median we just loaded. This will be initial (and max) value |
| * of next noise floor calibration the baseband does. |
| */ |
| ENABLE_REGWRITE_BUFFER(ah); |
| for (i = 0; i < NUM_NF_READINGS; i++) { |
| if (chainmask & (1 << i)) { |
| if ((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(chan)) |
| continue; |
| |
| val = REG_READ(ah, ah->nf_regs[i]); |
| val &= 0xFFFFFE00; |
| val |= (((u32) (-50) << 1) & 0x1ff); |
| REG_WRITE(ah, ah->nf_regs[i], val); |
| } |
| } |
| REGWRITE_BUFFER_FLUSH(ah); |
| |
| return 0; |
| } |
| |
| |
| static void ath9k_hw_nf_sanitize(struct ath_hw *ah, s16 *nf) |
| { |
| struct ath_common *common = ath9k_hw_common(ah); |
| struct ath_nf_limits *limit; |
| int i; |
| |
| if (IS_CHAN_2GHZ(ah->curchan)) |
| limit = &ah->nf_2g; |
| else |
| limit = &ah->nf_5g; |
| |
| for (i = 0; i < NUM_NF_READINGS; i++) { |
| if (!nf[i]) |
| continue; |
| |
| ath_dbg(common, CALIBRATE, |
| "NF calibrated [%s] [chain %d] is %d\n", |
| (i >= 3 ? "ext" : "ctl"), i % 3, nf[i]); |
| |
| if (nf[i] > limit->max) { |
| ath_dbg(common, CALIBRATE, |
| "NF[%d] (%d) > MAX (%d), correcting to MAX\n", |
| i, nf[i], limit->max); |
| nf[i] = limit->max; |
| } else if (nf[i] < limit->min) { |
| ath_dbg(common, CALIBRATE, |
| "NF[%d] (%d) < MIN (%d), correcting to NOM\n", |
| i, nf[i], limit->min); |
| nf[i] = limit->nominal; |
| } |
| } |
| } |
| |
| bool ath9k_hw_getnf(struct ath_hw *ah, struct ath9k_channel *chan) |
| { |
| struct ath_common *common = ath9k_hw_common(ah); |
| int16_t nf, nfThresh; |
| int16_t nfarray[NUM_NF_READINGS] = { 0 }; |
| struct ath9k_nfcal_hist *h; |
| struct ieee80211_channel *c = chan->chan; |
| struct ath9k_hw_cal_data *caldata = ah->caldata; |
| |
| if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) { |
| ath_dbg(common, CALIBRATE, |
| "NF did not complete in calibration window\n"); |
| return false; |
| } |
| |
| ath9k_hw_do_getnf(ah, nfarray); |
| ath9k_hw_nf_sanitize(ah, nfarray); |
| nf = nfarray[0]; |
| if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh) |
| && nf > nfThresh) { |
| ath_dbg(common, CALIBRATE, |
| "noise floor failed detected; detected %d, threshold %d\n", |
| nf, nfThresh); |
| } |
| |
| if (!caldata) { |
| chan->noisefloor = nf; |
| return false; |
| } |
| |
| h = caldata->nfCalHist; |
| clear_bit(NFCAL_PENDING, &caldata->cal_flags); |
| ath9k_hw_update_nfcal_hist_buffer(ah, caldata, nfarray); |
| chan->noisefloor = h[0].privNF; |
| ah->noise = ath9k_hw_getchan_noise(ah, chan, chan->noisefloor); |
| return true; |
| } |
| EXPORT_SYMBOL(ath9k_hw_getnf); |
| |
| void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah, |
| struct ath9k_channel *chan) |
| { |
| struct ath9k_nfcal_hist *h; |
| s16 default_nf; |
| int i, j; |
| |
| ah->caldata->channel = chan->channel; |
| ah->caldata->channelFlags = chan->channelFlags; |
| h = ah->caldata->nfCalHist; |
| default_nf = ath9k_hw_get_default_nf(ah, chan); |
| for (i = 0; i < NUM_NF_READINGS; i++) { |
| h[i].currIndex = 0; |
| h[i].privNF = default_nf; |
| h[i].invalidNFcount = AR_PHY_CCA_FILTERWINDOW_LENGTH; |
| for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) { |
| h[i].nfCalBuffer[j] = default_nf; |
| } |
| } |
| } |
| |
| |
| void ath9k_hw_bstuck_nfcal(struct ath_hw *ah) |
| { |
| struct ath9k_hw_cal_data *caldata = ah->caldata; |
| |
| if (unlikely(!caldata)) |
| return; |
| |
| /* |
| * If beacons are stuck, the most likely cause is interference. |
| * Triggering a noise floor calibration at this point helps the |
| * hardware adapt to a noisy environment much faster. |
| * To ensure that we recover from stuck beacons quickly, let |
| * the baseband update the internal NF value itself, similar to |
| * what is being done after a full reset. |
| */ |
| if (!test_bit(NFCAL_PENDING, &caldata->cal_flags)) |
| ath9k_hw_start_nfcal(ah, true); |
| else if (!(REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF)) |
| ath9k_hw_getnf(ah, ah->curchan); |
| |
| set_bit(NFCAL_INTF, &caldata->cal_flags); |
| } |
| EXPORT_SYMBOL(ath9k_hw_bstuck_nfcal); |
| |