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linux/drivers/net/wireless/ath/ath9k/ani.c

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/*
* Copyright (c) 2008-2010 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 <linux/kernel.h>
#include "hw.h"
#include "hw-ops.h"
struct ani_ofdm_level_entry {
int spur_immunity_level;
int fir_step_level;
int ofdm_weak_signal_on;
};
/* values here are relative to the INI */
/*
* Legend:
*
* SI: Spur immunity
* FS: FIR Step
* WS: OFDM / CCK Weak Signal detection
* MRC-CCK: Maximal Ratio Combining for CCK
*/
static const struct ani_ofdm_level_entry ofdm_level_table[] = {
/* SI FS WS */
{ 0, 0, 1 }, /* lvl 0 */
{ 1, 1, 1 }, /* lvl 1 */
{ 2, 2, 1 }, /* lvl 2 */
{ 3, 2, 1 }, /* lvl 3 (default) */
{ 4, 3, 1 }, /* lvl 4 */
{ 5, 4, 1 }, /* lvl 5 */
{ 6, 5, 1 }, /* lvl 6 */
{ 7, 6, 1 }, /* lvl 7 */
{ 7, 7, 1 }, /* lvl 8 */
{ 7, 8, 0 } /* lvl 9 */
};
#define ATH9K_ANI_OFDM_NUM_LEVEL \
ARRAY_SIZE(ofdm_level_table)
#define ATH9K_ANI_OFDM_MAX_LEVEL \
(ATH9K_ANI_OFDM_NUM_LEVEL-1)
#define ATH9K_ANI_OFDM_DEF_LEVEL \
3 /* default level - matches the INI settings */
/*
* MRC (Maximal Ratio Combining) has always been used with multi-antenna ofdm.
* With OFDM for single stream you just add up all antenna inputs, you're
* only interested in what you get after FFT. Signal aligment is also not
* required for OFDM because any phase difference adds up in the frequency
* domain.
*
* MRC requires extra work for use with CCK. You need to align the antenna
* signals from the different antenna before you can add the signals together.
* You need aligment of signals as CCK is in time domain, so addition can cancel
* your signal completely if phase is 180 degrees (think of adding sine waves).
* You also need to remove noise before the addition and this is where ANI
* MRC CCK comes into play. One of the antenna inputs may be stronger but
* lower SNR, so just adding after alignment can be dangerous.
*
* Regardless of alignment in time, the antenna signals add constructively after
* FFT and improve your reception. For more information:
*
* http://en.wikipedia.org/wiki/Maximal-ratio_combining
*/
struct ani_cck_level_entry {
int fir_step_level;
int mrc_cck_on;
};
static const struct ani_cck_level_entry cck_level_table[] = {
/* FS MRC-CCK */
{ 0, 1 }, /* lvl 0 */
{ 1, 1 }, /* lvl 1 */
{ 2, 1 }, /* lvl 2 (default) */
{ 3, 1 }, /* lvl 3 */
{ 4, 0 }, /* lvl 4 */
{ 5, 0 }, /* lvl 5 */
{ 6, 0 }, /* lvl 6 */
{ 7, 0 }, /* lvl 7 (only for high rssi) */
{ 8, 0 } /* lvl 8 (only for high rssi) */
};
#define ATH9K_ANI_CCK_NUM_LEVEL \
ARRAY_SIZE(cck_level_table)
#define ATH9K_ANI_CCK_MAX_LEVEL \
(ATH9K_ANI_CCK_NUM_LEVEL-1)
#define ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI \
(ATH9K_ANI_CCK_NUM_LEVEL-3)
#define ATH9K_ANI_CCK_DEF_LEVEL \
2 /* default level - matches the INI settings */
static bool use_new_ani(struct ath_hw *ah)
{
return AR_SREV_9300_20_OR_LATER(ah) || modparam_force_new_ani;
}
static void ath9k_hw_update_mibstats(struct ath_hw *ah,
struct ath9k_mib_stats *stats)
{
stats->ackrcv_bad += REG_READ(ah, AR_ACK_FAIL);
stats->rts_bad += REG_READ(ah, AR_RTS_FAIL);
stats->fcs_bad += REG_READ(ah, AR_FCS_FAIL);
stats->rts_good += REG_READ(ah, AR_RTS_OK);
stats->beacons += REG_READ(ah, AR_BEACON_CNT);
}
static void ath9k_ani_restart(struct ath_hw *ah)
{
struct ar5416AniState *aniState;
struct ath_common *common = ath9k_hw_common(ah);
u32 ofdm_base = 0, cck_base = 0;
if (!DO_ANI(ah))
return;
aniState = &ah->curchan->ani;
aniState->listenTime = 0;
if (!use_new_ani(ah)) {
ofdm_base = AR_PHY_COUNTMAX - ah->config.ofdm_trig_high;
cck_base = AR_PHY_COUNTMAX - ah->config.cck_trig_high;
}
ath_dbg(common, ATH_DBG_ANI,
"Writing ofdmbase=%u cckbase=%u\n", ofdm_base, cck_base);
ENABLE_REGWRITE_BUFFER(ah);
REG_WRITE(ah, AR_PHY_ERR_1, ofdm_base);
REG_WRITE(ah, AR_PHY_ERR_2, cck_base);
REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
REGWRITE_BUFFER_FLUSH(ah);
ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
aniState->ofdmPhyErrCount = 0;
aniState->cckPhyErrCount = 0;
}
static void ath9k_hw_ani_ofdm_err_trigger_old(struct ath_hw *ah)
{
struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
struct ar5416AniState *aniState;
int32_t rssi;
aniState = &ah->curchan->ani;
if (aniState->noiseImmunityLevel < HAL_NOISE_IMMUNE_MAX) {
if (ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
aniState->noiseImmunityLevel + 1)) {
return;
}
}
if (aniState->spurImmunityLevel < HAL_SPUR_IMMUNE_MAX) {
if (ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
aniState->spurImmunityLevel + 1)) {
return;
}
}
if (ah->opmode == NL80211_IFTYPE_AP) {
if (aniState->firstepLevel < HAL_FIRST_STEP_MAX) {
ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel + 1);
}
return;
}
rssi = BEACON_RSSI(ah);
if (rssi > aniState->rssiThrHigh) {
if (!aniState->ofdmWeakSigDetectOff) {
if (ath9k_hw_ani_control(ah,
ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
false)) {
ath9k_hw_ani_control(ah,
ATH9K_ANI_SPUR_IMMUNITY_LEVEL, 0);
return;
}
}
if (aniState->firstepLevel < HAL_FIRST_STEP_MAX) {
ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel + 1);
return;
}
} else if (rssi > aniState->rssiThrLow) {
if (aniState->ofdmWeakSigDetectOff)
ath9k_hw_ani_control(ah,
ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
true);
if (aniState->firstepLevel < HAL_FIRST_STEP_MAX)
ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel + 1);
return;
} else {
if ((conf->channel->band == IEEE80211_BAND_2GHZ) &&
!conf_is_ht(conf)) {
if (!aniState->ofdmWeakSigDetectOff)
ath9k_hw_ani_control(ah,
ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
false);
if (aniState->firstepLevel > 0)
ath9k_hw_ani_control(ah,
ATH9K_ANI_FIRSTEP_LEVEL, 0);
return;
}
}
}
static void ath9k_hw_ani_cck_err_trigger_old(struct ath_hw *ah)
{
struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
struct ar5416AniState *aniState;
int32_t rssi;
aniState = &ah->curchan->ani;
if (aniState->noiseImmunityLevel < HAL_NOISE_IMMUNE_MAX) {
if (ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
aniState->noiseImmunityLevel + 1)) {
return;
}
}
if (ah->opmode == NL80211_IFTYPE_AP) {
if (aniState->firstepLevel < HAL_FIRST_STEP_MAX) {
ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel + 1);
}
return;
}
rssi = BEACON_RSSI(ah);
if (rssi > aniState->rssiThrLow) {
if (aniState->firstepLevel < HAL_FIRST_STEP_MAX)
ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel + 1);
} else {
if ((conf->channel->band == IEEE80211_BAND_2GHZ) &&
!conf_is_ht(conf)) {
if (aniState->firstepLevel > 0)
ath9k_hw_ani_control(ah,
ATH9K_ANI_FIRSTEP_LEVEL, 0);
}
}
}
/* Adjust the OFDM Noise Immunity Level */
static void ath9k_hw_set_ofdm_nil(struct ath_hw *ah, u8 immunityLevel)
{
struct ar5416AniState *aniState = &ah->curchan->ani;
struct ath_common *common = ath9k_hw_common(ah);
const struct ani_ofdm_level_entry *entry_ofdm;
const struct ani_cck_level_entry *entry_cck;
aniState->noiseFloor = BEACON_RSSI(ah);
ath_dbg(common, ATH_DBG_ANI,
"**** ofdmlevel %d=>%d, rssi=%d[lo=%d hi=%d]\n",
aniState->ofdmNoiseImmunityLevel,
immunityLevel, aniState->noiseFloor,
aniState->rssiThrLow, aniState->rssiThrHigh);
aniState->ofdmNoiseImmunityLevel = immunityLevel;
entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
if (aniState->spurImmunityLevel != entry_ofdm->spur_immunity_level)
ath9k_hw_ani_control(ah,
ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
entry_ofdm->spur_immunity_level);
if (aniState->firstepLevel != entry_ofdm->fir_step_level &&
entry_ofdm->fir_step_level >= entry_cck->fir_step_level)
ath9k_hw_ani_control(ah,
ATH9K_ANI_FIRSTEP_LEVEL,
entry_ofdm->fir_step_level);
if ((ah->opmode != NL80211_IFTYPE_STATION &&
ah->opmode != NL80211_IFTYPE_ADHOC) ||
aniState->noiseFloor <= aniState->rssiThrHigh) {
if (aniState->ofdmWeakSigDetectOff)
/* force on ofdm weak sig detect */
ath9k_hw_ani_control(ah,
ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
true);
else if (aniState->ofdmWeakSigDetectOff ==
entry_ofdm->ofdm_weak_signal_on)
ath9k_hw_ani_control(ah,
ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
entry_ofdm->ofdm_weak_signal_on);
}
}
static void ath9k_hw_ani_ofdm_err_trigger(struct ath_hw *ah)
{
struct ar5416AniState *aniState;
if (!DO_ANI(ah))
return;
if (!use_new_ani(ah)) {
ath9k_hw_ani_ofdm_err_trigger_old(ah);
return;
}
aniState = &ah->curchan->ani;
if (aniState->ofdmNoiseImmunityLevel < ATH9K_ANI_OFDM_MAX_LEVEL)
ath9k_hw_set_ofdm_nil(ah, aniState->ofdmNoiseImmunityLevel + 1);
}
/*
* Set the ANI settings to match an CCK level.
*/
static void ath9k_hw_set_cck_nil(struct ath_hw *ah, u_int8_t immunityLevel)
{
struct ar5416AniState *aniState = &ah->curchan->ani;
struct ath_common *common = ath9k_hw_common(ah);
const struct ani_ofdm_level_entry *entry_ofdm;
const struct ani_cck_level_entry *entry_cck;
aniState->noiseFloor = BEACON_RSSI(ah);
ath_dbg(common, ATH_DBG_ANI,
"**** ccklevel %d=>%d, rssi=%d[lo=%d hi=%d]\n",
aniState->cckNoiseImmunityLevel, immunityLevel,
aniState->noiseFloor, aniState->rssiThrLow,
aniState->rssiThrHigh);
if ((ah->opmode == NL80211_IFTYPE_STATION ||
ah->opmode == NL80211_IFTYPE_ADHOC) &&
aniState->noiseFloor <= aniState->rssiThrLow &&
immunityLevel > ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI)
immunityLevel = ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI;
aniState->cckNoiseImmunityLevel = immunityLevel;
entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
if (aniState->firstepLevel != entry_cck->fir_step_level &&
entry_cck->fir_step_level >= entry_ofdm->fir_step_level)
ath9k_hw_ani_control(ah,
ATH9K_ANI_FIRSTEP_LEVEL,
entry_cck->fir_step_level);
/* Skip MRC CCK for pre AR9003 families */
if (!AR_SREV_9300_20_OR_LATER(ah) || AR_SREV_9485(ah))
return;
if (aniState->mrcCCKOff == entry_cck->mrc_cck_on)
ath9k_hw_ani_control(ah,
ATH9K_ANI_MRC_CCK,
entry_cck->mrc_cck_on);
}
static void ath9k_hw_ani_cck_err_trigger(struct ath_hw *ah)
{
struct ar5416AniState *aniState;
if (!DO_ANI(ah))
return;
if (!use_new_ani(ah)) {
ath9k_hw_ani_cck_err_trigger_old(ah);
return;
}
aniState = &ah->curchan->ani;
if (aniState->cckNoiseImmunityLevel < ATH9K_ANI_CCK_MAX_LEVEL)
ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel + 1);
}
static void ath9k_hw_ani_lower_immunity_old(struct ath_hw *ah)
{
struct ar5416AniState *aniState;
int32_t rssi;
aniState = &ah->curchan->ani;
if (ah->opmode == NL80211_IFTYPE_AP) {
if (aniState->firstepLevel > 0) {
if (ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel - 1))
return;
}
} else {
rssi = BEACON_RSSI(ah);
if (rssi > aniState->rssiThrHigh) {
/* XXX: Handle me */
} else if (rssi > aniState->rssiThrLow) {
if (aniState->ofdmWeakSigDetectOff) {
if (ath9k_hw_ani_control(ah,
ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
true) == true)
return;
}
if (aniState->firstepLevel > 0) {
if (ath9k_hw_ani_control(ah,
ATH9K_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel - 1) == true)
return;
}
} else {
if (aniState->firstepLevel > 0) {
if (ath9k_hw_ani_control(ah,
ATH9K_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel - 1) == true)
return;
}
}
}
if (aniState->spurImmunityLevel > 0) {
if (ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
aniState->spurImmunityLevel - 1))
return;
}
if (aniState->noiseImmunityLevel > 0) {
ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
aniState->noiseImmunityLevel - 1);
return;
}
}
/*
* only lower either OFDM or CCK errors per turn
* we lower the other one next time
*/
static void ath9k_hw_ani_lower_immunity(struct ath_hw *ah)
{
struct ar5416AniState *aniState;
aniState = &ah->curchan->ani;
if (!use_new_ani(ah)) {
ath9k_hw_ani_lower_immunity_old(ah);
return;
}
/* lower OFDM noise immunity */
if (aniState->ofdmNoiseImmunityLevel > 0 &&
(aniState->ofdmsTurn || aniState->cckNoiseImmunityLevel == 0)) {
ath9k_hw_set_ofdm_nil(ah, aniState->ofdmNoiseImmunityLevel - 1);
return;
}
/* lower CCK noise immunity */
if (aniState->cckNoiseImmunityLevel > 0)
ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel - 1);
}
static void ath9k_ani_reset_old(struct ath_hw *ah, bool is_scanning)
{
struct ar5416AniState *aniState;
struct ath9k_channel *chan = ah->curchan;
struct ath_common *common = ath9k_hw_common(ah);
if (!DO_ANI(ah))
return;
aniState = &ah->curchan->ani;
if (ah->opmode != NL80211_IFTYPE_STATION
&& ah->opmode != NL80211_IFTYPE_ADHOC) {
ath_dbg(common, ATH_DBG_ANI,
"Reset ANI state opmode %u\n", ah->opmode);
ah->stats.ast_ani_reset++;
if (ah->opmode == NL80211_IFTYPE_AP) {
/*
* ath9k_hw_ani_control() will only process items set on
* ah->ani_function
*/
if (IS_CHAN_2GHZ(chan))
ah->ani_function = (ATH9K_ANI_SPUR_IMMUNITY_LEVEL |
ATH9K_ANI_FIRSTEP_LEVEL);
else
ah->ani_function = 0;
}
ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL, 0);
ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL, 0);
ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL, 0);
ath9k_hw_ani_control(ah, ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
!ATH9K_ANI_USE_OFDM_WEAK_SIG);
ath9k_hw_ani_control(ah, ATH9K_ANI_CCK_WEAK_SIGNAL_THR,
ATH9K_ANI_CCK_WEAK_SIG_THR);
ath9k_hw_setrxfilter(ah, ath9k_hw_getrxfilter(ah) |
ATH9K_RX_FILTER_PHYERR);
ath9k_ani_restart(ah);
return;
}
if (aniState->noiseImmunityLevel != 0)
ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL,
aniState->noiseImmunityLevel);
if (aniState->spurImmunityLevel != 0)
ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
aniState->spurImmunityLevel);
if (aniState->ofdmWeakSigDetectOff)
ath9k_hw_ani_control(ah, ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
!aniState->ofdmWeakSigDetectOff);
if (aniState->cckWeakSigThreshold)
ath9k_hw_ani_control(ah, ATH9K_ANI_CCK_WEAK_SIGNAL_THR,
aniState->cckWeakSigThreshold);
if (aniState->firstepLevel != 0)
ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel);
ath9k_hw_setrxfilter(ah, ath9k_hw_getrxfilter(ah) &
~ATH9K_RX_FILTER_PHYERR);
ath9k_ani_restart(ah);
ENABLE_REGWRITE_BUFFER(ah);
REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
REGWRITE_BUFFER_FLUSH(ah);
}
/*
* Restore the ANI parameters in the HAL and reset the statistics.
* This routine should be called for every hardware reset and for
* every channel change.
*/
void ath9k_ani_reset(struct ath_hw *ah, bool is_scanning)
{
struct ar5416AniState *aniState = &ah->curchan->ani;
struct ath9k_channel *chan = ah->curchan;
struct ath_common *common = ath9k_hw_common(ah);
if (!DO_ANI(ah))
return;
if (!use_new_ani(ah))
return ath9k_ani_reset_old(ah, is_scanning);
BUG_ON(aniState == NULL);
ah->stats.ast_ani_reset++;
/* only allow a subset of functions in AP mode */
if (ah->opmode == NL80211_IFTYPE_AP) {
if (IS_CHAN_2GHZ(chan)) {
ah->ani_function = (ATH9K_ANI_SPUR_IMMUNITY_LEVEL |
ATH9K_ANI_FIRSTEP_LEVEL);
if (AR_SREV_9300_20_OR_LATER(ah))
ah->ani_function |= ATH9K_ANI_MRC_CCK;
} else
ah->ani_function = 0;
}
/* always allow mode (on/off) to be controlled */
ah->ani_function |= ATH9K_ANI_MODE;
if (is_scanning ||
(ah->opmode != NL80211_IFTYPE_STATION &&
ah->opmode != NL80211_IFTYPE_ADHOC)) {
/*
* If we're scanning or in AP mode, the defaults (ini)
* should be in place. For an AP we assume the historical
* levels for this channel are probably outdated so start
* from defaults instead.
*/
if (aniState->ofdmNoiseImmunityLevel !=
ATH9K_ANI_OFDM_DEF_LEVEL ||
aniState->cckNoiseImmunityLevel !=
ATH9K_ANI_CCK_DEF_LEVEL) {
ath_dbg(common, ATH_DBG_ANI,
"Restore defaults: opmode %u chan %d Mhz/0x%x is_scanning=%d ofdm:%d cck:%d\n",
ah->opmode,
chan->channel,
chan->channelFlags,
is_scanning,
aniState->ofdmNoiseImmunityLevel,
aniState->cckNoiseImmunityLevel);
ath9k_hw_set_ofdm_nil(ah, ATH9K_ANI_OFDM_DEF_LEVEL);
ath9k_hw_set_cck_nil(ah, ATH9K_ANI_CCK_DEF_LEVEL);
}
} else {
/*
* restore historical levels for this channel
*/
ath_dbg(common, ATH_DBG_ANI,
"Restore history: opmode %u chan %d Mhz/0x%x is_scanning=%d ofdm:%d cck:%d\n",
ah->opmode,
chan->channel,
chan->channelFlags,
is_scanning,
aniState->ofdmNoiseImmunityLevel,
aniState->cckNoiseImmunityLevel);
ath9k_hw_set_ofdm_nil(ah,
aniState->ofdmNoiseImmunityLevel);
ath9k_hw_set_cck_nil(ah,
aniState->cckNoiseImmunityLevel);
}
/*
* enable phy counters if hw supports or if not, enable phy
* interrupts (so we can count each one)
*/
ath9k_ani_restart(ah);
ENABLE_REGWRITE_BUFFER(ah);
REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
REGWRITE_BUFFER_FLUSH(ah);
}
static bool ath9k_hw_ani_read_counters(struct ath_hw *ah)
{
struct ath_common *common = ath9k_hw_common(ah);
struct ar5416AniState *aniState = &ah->curchan->ani;
u32 ofdm_base = 0;
u32 cck_base = 0;
u32 ofdmPhyErrCnt, cckPhyErrCnt;
u32 phyCnt1, phyCnt2;
int32_t listenTime;
ath_hw_cycle_counters_update(common);
listenTime = ath_hw_get_listen_time(common);
if (listenTime <= 0) {
ah->stats.ast_ani_lneg++;
ath9k_ani_restart(ah);
return false;
}
if (!use_new_ani(ah)) {
ofdm_base = AR_PHY_COUNTMAX - ah->config.ofdm_trig_high;
cck_base = AR_PHY_COUNTMAX - ah->config.cck_trig_high;
}
aniState->listenTime += listenTime;
ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
phyCnt1 = REG_READ(ah, AR_PHY_ERR_1);
phyCnt2 = REG_READ(ah, AR_PHY_ERR_2);
if (!use_new_ani(ah) && (phyCnt1 < ofdm_base || phyCnt2 < cck_base)) {
if (phyCnt1 < ofdm_base) {
ath_dbg(common, ATH_DBG_ANI,
"phyCnt1 0x%x, resetting counter value to 0x%x\n",
phyCnt1, ofdm_base);
REG_WRITE(ah, AR_PHY_ERR_1, ofdm_base);
REG_WRITE(ah, AR_PHY_ERR_MASK_1,
AR_PHY_ERR_OFDM_TIMING);
}
if (phyCnt2 < cck_base) {
ath_dbg(common, ATH_DBG_ANI,
"phyCnt2 0x%x, resetting counter value to 0x%x\n",
phyCnt2, cck_base);
REG_WRITE(ah, AR_PHY_ERR_2, cck_base);
REG_WRITE(ah, AR_PHY_ERR_MASK_2,
AR_PHY_ERR_CCK_TIMING);
}
return false;
}
ofdmPhyErrCnt = phyCnt1 - ofdm_base;
ah->stats.ast_ani_ofdmerrs +=
ofdmPhyErrCnt - aniState->ofdmPhyErrCount;
aniState->ofdmPhyErrCount = ofdmPhyErrCnt;
cckPhyErrCnt = phyCnt2 - cck_base;
ah->stats.ast_ani_cckerrs +=
cckPhyErrCnt - aniState->cckPhyErrCount;
aniState->cckPhyErrCount = cckPhyErrCnt;
return true;
}
void ath9k_hw_ani_monitor(struct ath_hw *ah, struct ath9k_channel *chan)
{
struct ar5416AniState *aniState;
struct ath_common *common = ath9k_hw_common(ah);
u32 ofdmPhyErrRate, cckPhyErrRate;
if (!DO_ANI(ah))
return;
aniState = &ah->curchan->ani;
if (WARN_ON(!aniState))
return;
if (!ath9k_hw_ani_read_counters(ah))
return;
ofdmPhyErrRate = aniState->ofdmPhyErrCount * 1000 /
aniState->listenTime;
cckPhyErrRate = aniState->cckPhyErrCount * 1000 /
aniState->listenTime;
ath_dbg(common, ATH_DBG_ANI,
"listenTime=%d OFDM:%d errs=%d/s CCK:%d errs=%d/s ofdm_turn=%d\n",
aniState->listenTime,
aniState->ofdmNoiseImmunityLevel,
ofdmPhyErrRate, aniState->cckNoiseImmunityLevel,
cckPhyErrRate, aniState->ofdmsTurn);
if (aniState->listenTime > 5 * ah->aniperiod) {
if (ofdmPhyErrRate <= ah->config.ofdm_trig_low &&
cckPhyErrRate <= ah->config.cck_trig_low) {
ath9k_hw_ani_lower_immunity(ah);
aniState->ofdmsTurn = !aniState->ofdmsTurn;
}
ath9k_ani_restart(ah);
} else if (aniState->listenTime > ah->aniperiod) {
/* check to see if need to raise immunity */
if (ofdmPhyErrRate > ah->config.ofdm_trig_high &&
(cckPhyErrRate <= ah->config.cck_trig_high ||
aniState->ofdmsTurn)) {
ath9k_hw_ani_ofdm_err_trigger(ah);
ath9k_ani_restart(ah);
aniState->ofdmsTurn = false;
} else if (cckPhyErrRate > ah->config.cck_trig_high) {
ath9k_hw_ani_cck_err_trigger(ah);
ath9k_ani_restart(ah);
aniState->ofdmsTurn = true;
}
}
}
EXPORT_SYMBOL(ath9k_hw_ani_monitor);
void ath9k_enable_mib_counters(struct ath_hw *ah)
{
struct ath_common *common = ath9k_hw_common(ah);
ath_dbg(common, ATH_DBG_ANI, "Enable MIB counters\n");
ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
ENABLE_REGWRITE_BUFFER(ah);
REG_WRITE(ah, AR_FILT_OFDM, 0);
REG_WRITE(ah, AR_FILT_CCK, 0);
REG_WRITE(ah, AR_MIBC,
~(AR_MIBC_COW | AR_MIBC_FMC | AR_MIBC_CMC | AR_MIBC_MCS)
& 0x0f);
REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
REGWRITE_BUFFER_FLUSH(ah);
}
/* Freeze the MIB counters, get the stats and then clear them */
void ath9k_hw_disable_mib_counters(struct ath_hw *ah)
{
struct ath_common *common = ath9k_hw_common(ah);
ath_dbg(common, ATH_DBG_ANI, "Disable MIB counters\n");
REG_WRITE(ah, AR_MIBC, AR_MIBC_FMC);
ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
REG_WRITE(ah, AR_MIBC, AR_MIBC_CMC);
REG_WRITE(ah, AR_FILT_OFDM, 0);
REG_WRITE(ah, AR_FILT_CCK, 0);
}
EXPORT_SYMBOL(ath9k_hw_disable_mib_counters);
/*
* Process a MIB interrupt. We may potentially be invoked because
* any of the MIB counters overflow/trigger so don't assume we're
* here because a PHY error counter triggered.
*/
void ath9k_hw_proc_mib_event(struct ath_hw *ah)
{
u32 phyCnt1, phyCnt2;
/* Reset these counters regardless */
REG_WRITE(ah, AR_FILT_OFDM, 0);
REG_WRITE(ah, AR_FILT_CCK, 0);
if (!(REG_READ(ah, AR_SLP_MIB_CTRL) & AR_SLP_MIB_PENDING))
REG_WRITE(ah, AR_SLP_MIB_CTRL, AR_SLP_MIB_CLEAR);
/* Clear the mib counters and save them in the stats */
ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
if (!DO_ANI(ah)) {
/*
* We must always clear the interrupt cause by
* resetting the phy error regs.
*/
REG_WRITE(ah, AR_PHY_ERR_1, 0);
REG_WRITE(ah, AR_PHY_ERR_2, 0);
return;
}
/* NB: these are not reset-on-read */
phyCnt1 = REG_READ(ah, AR_PHY_ERR_1);
phyCnt2 = REG_READ(ah, AR_PHY_ERR_2);
if (((phyCnt1 & AR_MIBCNT_INTRMASK) == AR_MIBCNT_INTRMASK) ||
((phyCnt2 & AR_MIBCNT_INTRMASK) == AR_MIBCNT_INTRMASK)) {
if (!use_new_ani(ah))
ath9k_hw_ani_read_counters(ah);
/* NB: always restart to insure the h/w counters are reset */
ath9k_ani_restart(ah);
}
}
EXPORT_SYMBOL(ath9k_hw_proc_mib_event);
void ath9k_hw_ani_setup(struct ath_hw *ah)
{
int i;
static const int totalSizeDesired[] = { -55, -55, -55, -55, -62 };
static const int coarseHigh[] = { -14, -14, -14, -14, -12 };
static const int coarseLow[] = { -64, -64, -64, -64, -70 };
static const int firpwr[] = { -78, -78, -78, -78, -80 };
for (i = 0; i < 5; i++) {
ah->totalSizeDesired[i] = totalSizeDesired[i];
ah->coarse_high[i] = coarseHigh[i];
ah->coarse_low[i] = coarseLow[i];
ah->firpwr[i] = firpwr[i];
}
}
void ath9k_hw_ani_init(struct ath_hw *ah)
{
struct ath_common *common = ath9k_hw_common(ah);
int i;
ath_dbg(common, ATH_DBG_ANI, "Initialize ANI\n");
if (use_new_ani(ah)) {
ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_NEW;
ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_NEW;
ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH_NEW;
ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW_NEW;
} else {
ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_OLD;
ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_OLD;
ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH_OLD;
ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW_OLD;
}
for (i = 0; i < ARRAY_SIZE(ah->channels); i++) {
struct ath9k_channel *chan = &ah->channels[i];
struct ar5416AniState *ani = &chan->ani;
if (use_new_ani(ah)) {
ani->spurImmunityLevel =
ATH9K_ANI_SPUR_IMMUNE_LVL_NEW;
ani->firstepLevel = ATH9K_ANI_FIRSTEP_LVL_NEW;
if (AR_SREV_9300_20_OR_LATER(ah))
ani->mrcCCKOff =
!ATH9K_ANI_ENABLE_MRC_CCK;
else
ani->mrcCCKOff = true;
ani->ofdmsTurn = true;
} else {
ani->spurImmunityLevel =
ATH9K_ANI_SPUR_IMMUNE_LVL_OLD;
ani->firstepLevel = ATH9K_ANI_FIRSTEP_LVL_OLD;
ani->cckWeakSigThreshold =
ATH9K_ANI_CCK_WEAK_SIG_THR;
}
ani->rssiThrHigh = ATH9K_ANI_RSSI_THR_HIGH;
ani->rssiThrLow = ATH9K_ANI_RSSI_THR_LOW;
ani->ofdmWeakSigDetectOff =
!ATH9K_ANI_USE_OFDM_WEAK_SIG;
ani->cckNoiseImmunityLevel = ATH9K_ANI_CCK_DEF_LEVEL;
}
/*
* since we expect some ongoing maintenance on the tables, let's sanity
* check here default level should not modify INI setting.
*/
if (use_new_ani(ah)) {
const struct ani_ofdm_level_entry *entry_ofdm;
const struct ani_cck_level_entry *entry_cck;
entry_ofdm = &ofdm_level_table[ATH9K_ANI_OFDM_DEF_LEVEL];
entry_cck = &cck_level_table[ATH9K_ANI_CCK_DEF_LEVEL];
ah->aniperiod = ATH9K_ANI_PERIOD_NEW;
ah->config.ani_poll_interval = ATH9K_ANI_POLLINTERVAL_NEW;
} else {
ah->aniperiod = ATH9K_ANI_PERIOD_OLD;
ah->config.ani_poll_interval = ATH9K_ANI_POLLINTERVAL_OLD;
}
if (ah->config.enable_ani)
ah->proc_phyerr |= HAL_PROCESS_ANI;
ath9k_ani_restart(ah);
ath9k_enable_mib_counters(ah);
}
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