521 lines
15 KiB
C
521 lines
15 KiB
C
/*
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* Copyright (c) 2008-2011 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 <linux/kernel.h>
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#include <linux/export.h>
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#include "hw.h"
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#include "hw-ops.h"
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struct ani_ofdm_level_entry {
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int spur_immunity_level;
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int fir_step_level;
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int ofdm_weak_signal_on;
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};
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/* values here are relative to the INI */
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/*
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* Legend:
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*
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* SI: Spur immunity
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* FS: FIR Step
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* WS: OFDM / CCK Weak Signal detection
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* MRC-CCK: Maximal Ratio Combining for CCK
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*/
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static const struct ani_ofdm_level_entry ofdm_level_table[] = {
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/* SI FS WS */
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{ 0, 0, 1 }, /* lvl 0 */
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{ 1, 1, 1 }, /* lvl 1 */
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{ 2, 2, 1 }, /* lvl 2 */
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{ 3, 2, 1 }, /* lvl 3 (default) */
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{ 4, 3, 1 }, /* lvl 4 */
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{ 5, 4, 1 }, /* lvl 5 */
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{ 6, 5, 1 }, /* lvl 6 */
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{ 7, 6, 1 }, /* lvl 7 */
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{ 7, 7, 1 }, /* lvl 8 */
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{ 7, 8, 0 } /* lvl 9 */
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};
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#define ATH9K_ANI_OFDM_NUM_LEVEL \
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ARRAY_SIZE(ofdm_level_table)
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#define ATH9K_ANI_OFDM_MAX_LEVEL \
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(ATH9K_ANI_OFDM_NUM_LEVEL-1)
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#define ATH9K_ANI_OFDM_DEF_LEVEL \
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3 /* default level - matches the INI settings */
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/*
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* MRC (Maximal Ratio Combining) has always been used with multi-antenna ofdm.
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* With OFDM for single stream you just add up all antenna inputs, you're
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* only interested in what you get after FFT. Signal aligment is also not
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* required for OFDM because any phase difference adds up in the frequency
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* domain.
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*
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* MRC requires extra work for use with CCK. You need to align the antenna
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* signals from the different antenna before you can add the signals together.
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* You need aligment of signals as CCK is in time domain, so addition can cancel
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* your signal completely if phase is 180 degrees (think of adding sine waves).
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* You also need to remove noise before the addition and this is where ANI
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* MRC CCK comes into play. One of the antenna inputs may be stronger but
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* lower SNR, so just adding after alignment can be dangerous.
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*
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* Regardless of alignment in time, the antenna signals add constructively after
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* FFT and improve your reception. For more information:
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*
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* http://en.wikipedia.org/wiki/Maximal-ratio_combining
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*/
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struct ani_cck_level_entry {
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int fir_step_level;
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int mrc_cck_on;
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};
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static const struct ani_cck_level_entry cck_level_table[] = {
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/* FS MRC-CCK */
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{ 0, 1 }, /* lvl 0 */
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{ 1, 1 }, /* lvl 1 */
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{ 2, 1 }, /* lvl 2 (default) */
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{ 3, 1 }, /* lvl 3 */
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{ 4, 0 }, /* lvl 4 */
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{ 5, 0 }, /* lvl 5 */
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{ 6, 0 }, /* lvl 6 */
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{ 7, 0 }, /* lvl 7 (only for high rssi) */
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{ 8, 0 } /* lvl 8 (only for high rssi) */
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};
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#define ATH9K_ANI_CCK_NUM_LEVEL \
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ARRAY_SIZE(cck_level_table)
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#define ATH9K_ANI_CCK_MAX_LEVEL \
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(ATH9K_ANI_CCK_NUM_LEVEL-1)
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#define ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI \
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(ATH9K_ANI_CCK_NUM_LEVEL-3)
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#define ATH9K_ANI_CCK_DEF_LEVEL \
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2 /* default level - matches the INI settings */
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static void ath9k_hw_update_mibstats(struct ath_hw *ah,
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struct ath9k_mib_stats *stats)
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{
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stats->ackrcv_bad += REG_READ(ah, AR_ACK_FAIL);
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stats->rts_bad += REG_READ(ah, AR_RTS_FAIL);
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stats->fcs_bad += REG_READ(ah, AR_FCS_FAIL);
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stats->rts_good += REG_READ(ah, AR_RTS_OK);
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stats->beacons += REG_READ(ah, AR_BEACON_CNT);
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}
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static void ath9k_ani_restart(struct ath_hw *ah)
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{
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struct ar5416AniState *aniState;
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if (!ah->curchan)
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return;
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aniState = &ah->ani;
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aniState->listenTime = 0;
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ENABLE_REGWRITE_BUFFER(ah);
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REG_WRITE(ah, AR_PHY_ERR_1, 0);
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REG_WRITE(ah, AR_PHY_ERR_2, 0);
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REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
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REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
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REGWRITE_BUFFER_FLUSH(ah);
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ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
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aniState->ofdmPhyErrCount = 0;
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aniState->cckPhyErrCount = 0;
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}
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/* Adjust the OFDM Noise Immunity Level */
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static void ath9k_hw_set_ofdm_nil(struct ath_hw *ah, u8 immunityLevel,
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bool scan)
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{
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struct ar5416AniState *aniState = &ah->ani;
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struct ath_common *common = ath9k_hw_common(ah);
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const struct ani_ofdm_level_entry *entry_ofdm;
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const struct ani_cck_level_entry *entry_cck;
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bool weak_sig;
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ath_dbg(common, ANI, "**** ofdmlevel %d=>%d, rssi=%d[lo=%d hi=%d]\n",
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aniState->ofdmNoiseImmunityLevel,
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immunityLevel, BEACON_RSSI(ah),
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ATH9K_ANI_RSSI_THR_LOW,
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ATH9K_ANI_RSSI_THR_HIGH);
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if (AR_SREV_9100(ah) && immunityLevel < ATH9K_ANI_OFDM_DEF_LEVEL)
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immunityLevel = ATH9K_ANI_OFDM_DEF_LEVEL;
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if (!scan)
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aniState->ofdmNoiseImmunityLevel = immunityLevel;
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entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
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entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
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if (aniState->spurImmunityLevel != entry_ofdm->spur_immunity_level)
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ath9k_hw_ani_control(ah,
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ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
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entry_ofdm->spur_immunity_level);
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if (aniState->firstepLevel != entry_ofdm->fir_step_level &&
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entry_ofdm->fir_step_level >= entry_cck->fir_step_level)
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ath9k_hw_ani_control(ah,
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ATH9K_ANI_FIRSTEP_LEVEL,
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entry_ofdm->fir_step_level);
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weak_sig = entry_ofdm->ofdm_weak_signal_on;
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if (ah->opmode == NL80211_IFTYPE_STATION &&
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BEACON_RSSI(ah) <= ATH9K_ANI_RSSI_THR_HIGH)
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weak_sig = true;
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/*
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* Newer chipsets are better at dealing with high PHY error counts -
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* keep weak signal detection enabled when no RSSI threshold is
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* available to determine if it is needed (mode != STA)
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*/
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else if (AR_SREV_9300_20_OR_LATER(ah) &&
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ah->opmode != NL80211_IFTYPE_STATION)
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weak_sig = true;
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/* Older chipsets are more sensitive to high PHY error counts */
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else if (!AR_SREV_9300_20_OR_LATER(ah) &&
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aniState->ofdmNoiseImmunityLevel >= 8)
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weak_sig = false;
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if (aniState->ofdmWeakSigDetect != weak_sig)
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ath9k_hw_ani_control(ah, ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
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weak_sig);
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if (!AR_SREV_9300_20_OR_LATER(ah))
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return;
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if (aniState->ofdmNoiseImmunityLevel >= ATH9K_ANI_OFDM_DEF_LEVEL) {
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ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH;
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ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_ABOVE_INI;
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} else {
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ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_BELOW_INI;
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ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW;
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}
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}
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static void ath9k_hw_ani_ofdm_err_trigger(struct ath_hw *ah)
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{
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struct ar5416AniState *aniState;
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if (!ah->curchan)
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return;
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aniState = &ah->ani;
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if (aniState->ofdmNoiseImmunityLevel < ATH9K_ANI_OFDM_MAX_LEVEL)
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ath9k_hw_set_ofdm_nil(ah, aniState->ofdmNoiseImmunityLevel + 1, false);
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}
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/*
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* Set the ANI settings to match an CCK level.
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*/
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static void ath9k_hw_set_cck_nil(struct ath_hw *ah, u_int8_t immunityLevel,
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bool scan)
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{
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struct ar5416AniState *aniState = &ah->ani;
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struct ath_common *common = ath9k_hw_common(ah);
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const struct ani_ofdm_level_entry *entry_ofdm;
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const struct ani_cck_level_entry *entry_cck;
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ath_dbg(common, ANI, "**** ccklevel %d=>%d, rssi=%d[lo=%d hi=%d]\n",
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aniState->cckNoiseImmunityLevel, immunityLevel,
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BEACON_RSSI(ah), ATH9K_ANI_RSSI_THR_LOW,
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ATH9K_ANI_RSSI_THR_HIGH);
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if (AR_SREV_9100(ah) && immunityLevel < ATH9K_ANI_CCK_DEF_LEVEL)
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immunityLevel = ATH9K_ANI_CCK_DEF_LEVEL;
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if (ah->opmode == NL80211_IFTYPE_STATION &&
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BEACON_RSSI(ah) <= ATH9K_ANI_RSSI_THR_LOW &&
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immunityLevel > ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI)
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immunityLevel = ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI;
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if (!scan)
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aniState->cckNoiseImmunityLevel = immunityLevel;
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entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
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entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
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if (aniState->firstepLevel != entry_cck->fir_step_level &&
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entry_cck->fir_step_level >= entry_ofdm->fir_step_level)
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ath9k_hw_ani_control(ah,
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ATH9K_ANI_FIRSTEP_LEVEL,
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entry_cck->fir_step_level);
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/* Skip MRC CCK for pre AR9003 families */
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if (!AR_SREV_9300_20_OR_LATER(ah) || AR_SREV_9485(ah) || AR_SREV_9565(ah))
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return;
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if (aniState->mrcCCK != entry_cck->mrc_cck_on)
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ath9k_hw_ani_control(ah,
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ATH9K_ANI_MRC_CCK,
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entry_cck->mrc_cck_on);
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}
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static void ath9k_hw_ani_cck_err_trigger(struct ath_hw *ah)
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{
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struct ar5416AniState *aniState;
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if (!ah->curchan)
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return;
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aniState = &ah->ani;
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if (aniState->cckNoiseImmunityLevel < ATH9K_ANI_CCK_MAX_LEVEL)
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ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel + 1,
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false);
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}
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/*
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* only lower either OFDM or CCK errors per turn
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* we lower the other one next time
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*/
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static void ath9k_hw_ani_lower_immunity(struct ath_hw *ah)
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{
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struct ar5416AniState *aniState;
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aniState = &ah->ani;
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/* lower OFDM noise immunity */
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if (aniState->ofdmNoiseImmunityLevel > 0 &&
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(aniState->ofdmsTurn || aniState->cckNoiseImmunityLevel == 0)) {
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ath9k_hw_set_ofdm_nil(ah, aniState->ofdmNoiseImmunityLevel - 1,
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false);
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return;
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}
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/* lower CCK noise immunity */
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if (aniState->cckNoiseImmunityLevel > 0)
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ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel - 1,
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false);
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}
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/*
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* Restore the ANI parameters in the HAL and reset the statistics.
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* This routine should be called for every hardware reset and for
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* every channel change.
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*/
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void ath9k_ani_reset(struct ath_hw *ah, bool is_scanning)
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{
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struct ar5416AniState *aniState = &ah->ani;
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struct ath9k_channel *chan = ah->curchan;
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struct ath_common *common = ath9k_hw_common(ah);
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int ofdm_nil, cck_nil;
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if (!ah->curchan)
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return;
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BUG_ON(aniState == NULL);
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ah->stats.ast_ani_reset++;
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ofdm_nil = max_t(int, ATH9K_ANI_OFDM_DEF_LEVEL,
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aniState->ofdmNoiseImmunityLevel);
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cck_nil = max_t(int, ATH9K_ANI_CCK_DEF_LEVEL,
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aniState->cckNoiseImmunityLevel);
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if (is_scanning ||
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(ah->opmode != NL80211_IFTYPE_STATION &&
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ah->opmode != NL80211_IFTYPE_ADHOC)) {
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/*
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* If we're scanning or in AP mode, the defaults (ini)
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* should be in place. For an AP we assume the historical
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* levels for this channel are probably outdated so start
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* from defaults instead.
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*/
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if (aniState->ofdmNoiseImmunityLevel !=
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ATH9K_ANI_OFDM_DEF_LEVEL ||
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aniState->cckNoiseImmunityLevel !=
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ATH9K_ANI_CCK_DEF_LEVEL) {
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ath_dbg(common, ANI,
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"Restore defaults: opmode %u chan %d Mhz is_scanning=%d ofdm:%d cck:%d\n",
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ah->opmode,
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chan->channel,
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is_scanning,
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aniState->ofdmNoiseImmunityLevel,
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aniState->cckNoiseImmunityLevel);
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ofdm_nil = ATH9K_ANI_OFDM_DEF_LEVEL;
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cck_nil = ATH9K_ANI_CCK_DEF_LEVEL;
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}
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} else {
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/*
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* restore historical levels for this channel
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*/
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ath_dbg(common, ANI,
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"Restore history: opmode %u chan %d Mhz is_scanning=%d ofdm:%d cck:%d\n",
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ah->opmode,
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chan->channel,
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is_scanning,
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aniState->ofdmNoiseImmunityLevel,
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aniState->cckNoiseImmunityLevel);
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}
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ath9k_hw_set_ofdm_nil(ah, ofdm_nil, is_scanning);
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ath9k_hw_set_cck_nil(ah, cck_nil, is_scanning);
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ath9k_ani_restart(ah);
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}
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static bool ath9k_hw_ani_read_counters(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 ar5416AniState *aniState = &ah->ani;
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u32 phyCnt1, phyCnt2;
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int32_t listenTime;
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ath_hw_cycle_counters_update(common);
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listenTime = ath_hw_get_listen_time(common);
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if (listenTime <= 0) {
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ah->stats.ast_ani_lneg_or_lzero++;
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ath9k_ani_restart(ah);
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return false;
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}
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aniState->listenTime += listenTime;
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ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
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phyCnt1 = REG_READ(ah, AR_PHY_ERR_1);
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phyCnt2 = REG_READ(ah, AR_PHY_ERR_2);
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ah->stats.ast_ani_ofdmerrs += phyCnt1 - aniState->ofdmPhyErrCount;
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aniState->ofdmPhyErrCount = phyCnt1;
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ah->stats.ast_ani_cckerrs += phyCnt2 - aniState->cckPhyErrCount;
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aniState->cckPhyErrCount = phyCnt2;
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return true;
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}
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void ath9k_hw_ani_monitor(struct ath_hw *ah, struct ath9k_channel *chan)
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{
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struct ar5416AniState *aniState;
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struct ath_common *common = ath9k_hw_common(ah);
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u32 ofdmPhyErrRate, cckPhyErrRate;
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if (!ah->curchan)
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return;
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aniState = &ah->ani;
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if (!ath9k_hw_ani_read_counters(ah))
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return;
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ofdmPhyErrRate = aniState->ofdmPhyErrCount * 1000 /
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aniState->listenTime;
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cckPhyErrRate = aniState->cckPhyErrCount * 1000 /
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aniState->listenTime;
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ath_dbg(common, ANI,
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"listenTime=%d OFDM:%d errs=%d/s CCK:%d errs=%d/s ofdm_turn=%d\n",
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aniState->listenTime,
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aniState->ofdmNoiseImmunityLevel,
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ofdmPhyErrRate, aniState->cckNoiseImmunityLevel,
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cckPhyErrRate, aniState->ofdmsTurn);
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if (aniState->listenTime > ah->aniperiod) {
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if (cckPhyErrRate < ah->config.cck_trig_low &&
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ofdmPhyErrRate < ah->config.ofdm_trig_low) {
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ath9k_hw_ani_lower_immunity(ah);
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aniState->ofdmsTurn = !aniState->ofdmsTurn;
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} else if (ofdmPhyErrRate > ah->config.ofdm_trig_high) {
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ath9k_hw_ani_ofdm_err_trigger(ah);
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aniState->ofdmsTurn = false;
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} else if (cckPhyErrRate > ah->config.cck_trig_high) {
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ath9k_hw_ani_cck_err_trigger(ah);
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aniState->ofdmsTurn = true;
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}
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ath9k_ani_restart(ah);
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}
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}
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EXPORT_SYMBOL(ath9k_hw_ani_monitor);
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void ath9k_enable_mib_counters(struct ath_hw *ah)
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{
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struct ath_common *common = ath9k_hw_common(ah);
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ath_dbg(common, ANI, "Enable MIB counters\n");
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ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
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ENABLE_REGWRITE_BUFFER(ah);
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REG_WRITE(ah, AR_FILT_OFDM, 0);
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REG_WRITE(ah, AR_FILT_CCK, 0);
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REG_WRITE(ah, AR_MIBC,
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~(AR_MIBC_COW | AR_MIBC_FMC | AR_MIBC_CMC | AR_MIBC_MCS)
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& 0x0f);
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REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
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REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
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|
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REGWRITE_BUFFER_FLUSH(ah);
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}
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|
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/* Freeze the MIB counters, get the stats and then clear them */
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void ath9k_hw_disable_mib_counters(struct ath_hw *ah)
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{
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struct ath_common *common = ath9k_hw_common(ah);
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|
|
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ath_dbg(common, ANI, "Disable MIB counters\n");
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|
|
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REG_WRITE(ah, AR_MIBC, AR_MIBC_FMC);
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ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
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REG_WRITE(ah, AR_MIBC, AR_MIBC_CMC);
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REG_WRITE(ah, AR_FILT_OFDM, 0);
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REG_WRITE(ah, AR_FILT_CCK, 0);
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}
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EXPORT_SYMBOL(ath9k_hw_disable_mib_counters);
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|
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void ath9k_hw_ani_init(struct ath_hw *ah)
|
|
{
|
|
struct ath_common *common = ath9k_hw_common(ah);
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struct ar5416AniState *ani = &ah->ani;
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|
|
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ath_dbg(common, ANI, "Initialize ANI\n");
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|
|
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if (AR_SREV_9300_20_OR_LATER(ah)) {
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ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH;
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ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW;
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ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH;
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ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW;
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} else {
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ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_OLD;
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ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_OLD;
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ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH_OLD;
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ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW_OLD;
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}
|
|
|
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ani->spurImmunityLevel = ATH9K_ANI_SPUR_IMMUNE_LVL;
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ani->firstepLevel = ATH9K_ANI_FIRSTEP_LVL;
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ani->mrcCCK = AR_SREV_9300_20_OR_LATER(ah) ? true : false;
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|
ani->ofdmsTurn = true;
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ani->ofdmWeakSigDetect = true;
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ani->cckNoiseImmunityLevel = ATH9K_ANI_CCK_DEF_LEVEL;
|
|
ani->ofdmNoiseImmunityLevel = ATH9K_ANI_OFDM_DEF_LEVEL;
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|
|
|
/*
|
|
* since we expect some ongoing maintenance on the tables, let's sanity
|
|
* check here default level should not modify INI setting.
|
|
*/
|
|
ah->aniperiod = ATH9K_ANI_PERIOD;
|
|
ah->config.ani_poll_interval = ATH9K_ANI_POLLINTERVAL;
|
|
|
|
ath9k_ani_restart(ah);
|
|
ath9k_enable_mib_counters(ah);
|
|
}
|