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madwifi/ath_hal/ar5416/ar5416_ani.c
proski 5702465321 Merge madwifi-free branch into the trunk 
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3978 0192ed92-7a03-0410-a25b-9323aeb14dbd
2009-04-07 01:26:53 +00:00

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/*
* Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
* Copyright (c) 2002-2008 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.
*
* $Id: ar5416_ani.c,v 1.1 2008/11/11 20:46:06 sam Exp $
*/
#include "opt_ah.h"
/*
* XXX this is virtually the same code as for 5212; we reuse
* storage in the 5212 state block; need to refactor.
*/
#include "ah.h"
#include "ah_internal.h"
#include "ah_desc.h"
#include "ar5416/ar5416.h"
#include "ar5416/ar5416reg.h"
#include "ar5416/ar5416phy.h"
/*
* Anti noise immunity support. We track phy errors and react
* to excessive errors by adjusting the noise immunity parameters.
*/
#define HAL_EP_RND(x, mul) \
((((x)%(mul)) >= ((mul)/2)) ? ((x) + ((mul) - 1)) / (mul) : (x)/(mul))
#define BEACON_RSSI(ahp) \
HAL_EP_RND(ahp->ah_stats.ast_nodestats.ns_avgbrssi, \
HAL_RSSI_EP_MULTIPLIER)
/*
* ANI processing tunes radio parameters according to PHY errors
* and related information. This is done for for noise and spur
* immunity in all operating modes if the device indicates it's
* capable at attach time. In addition, when there is a reference
* rssi value (e.g. beacon frames from an ap in station mode)
* further tuning is done.
*
* ANI_ENA indicates whether any ANI processing should be done;
* this is specified at attach time.
*
* ANI_ENA_RSSI indicates whether rssi-based processing should
* done, this is enabled based on operating mode and is meaningful
* only if ANI_ENA is true.
*
* ANI parameters are typically controlled only by the hal. The
* AniControl interface however permits manual tuning through the
* diagnostic api.
*/
#define ANI_ENA(ah) \
(AH5212(ah)->ah_procPhyErr & HAL_ANI_ENA)
#define ANI_ENA_RSSI(ah) \
(AH5212(ah)->ah_procPhyErr & HAL_RSSI_ANI_ENA)
#define ah_mibStats ah_stats.ast_mibstats
static void
enableAniMIBCounters(struct ath_hal *ah, const struct ar5212AniParams *params)
{
struct ath_hal_5212 *ahp = AH5212(ah);
HALDEBUG(ah, HAL_DEBUG_ANI, "%s: Enable mib counters: "
"OfdmPhyErrBase 0x%x cckPhyErrBase 0x%x\n",
__func__, params->ofdmPhyErrBase, params->cckPhyErrBase);
OS_REG_WRITE(ah, AR_FILTOFDM, 0);
OS_REG_WRITE(ah, AR_FILTCCK, 0);
OS_REG_WRITE(ah, AR_PHYCNT1, params->ofdmPhyErrBase);
OS_REG_WRITE(ah, AR_PHYCNT2, params->cckPhyErrBase);
OS_REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
OS_REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
ar5212UpdateMibCounters(ah, &ahp->ah_mibStats); /* save+clear counters*/
ar5212EnableMibCounters(ah); /* enable everything */
}
static void
disableAniMIBCounters(struct ath_hal *ah)
{
struct ath_hal_5212 *ahp = AH5212(ah);
HALDEBUG(ah, HAL_DEBUG_ANI, "Disable MIB counters\n");
ar5212UpdateMibCounters(ah, &ahp->ah_mibStats); /* save stats */
ar5212DisableMibCounters(ah); /* disable everything */
OS_REG_WRITE(ah, AR_PHY_ERR_MASK_1, 0);
OS_REG_WRITE(ah, AR_PHY_ERR_MASK_2, 0);
}
/*
* This routine returns the index into the aniState array that
* corresponds to the channel in *chan. If no match is found and the
* array is still not fully utilized, a new entry is created for the
* channel. We assume the attach function has already initialized the
* ah_ani values and only the channel field needs to be set.
*/
static int
ar5416GetAniChannelIndex(struct ath_hal *ah, HAL_CHANNEL_INTERNAL *chan)
{
#define N(a) (sizeof(a) / sizeof(a[0]))
struct ath_hal_5212 *ahp = AH5212(ah);
int i;
for (i = 0; i < N(ahp->ah_ani); i++) {
struct ar5212AniState *asp = &ahp->ah_ani[i];
if (asp->c.channel == chan->channel)
return i;
if (asp->c.channel == 0) {
asp->c.channel = chan->channel;
asp->c.channelFlags = chan->channelFlags;
asp->c.privFlags = chan->privFlags;
asp->isSetup = AH_FALSE;
if (IS_CHAN_2GHZ(chan))
asp->params = &ahp->ah_aniParams24;
else
asp->params = &ahp->ah_aniParams5;
return i;
}
}
/* XXX statistic */
HALDEBUG(ah, HAL_DEBUG_ANY,
"No more channel states left. Using channel 0\n");
return 0; /* XXX gotta return something valid */
#undef N
}
static void
setPhyErrBase(struct ath_hal *ah, struct ar5212AniParams *params)
{
if (params->ofdmTrigHigh >= AR_PHY_COUNTMAX) {
HALDEBUG(ah, HAL_DEBUG_ANY,
"OFDM Trigger %d is too high for hw counters, using max\n",
params->ofdmTrigHigh);
params->ofdmPhyErrBase = 0;
} else
params->ofdmPhyErrBase = AR_PHY_COUNTMAX - params->ofdmTrigHigh;
if (params->cckTrigHigh >= AR_PHY_COUNTMAX) {
HALDEBUG(ah, HAL_DEBUG_ANY,
"CCK Trigger %d is too high for hw counters, using max\n",
params->cckTrigHigh);
params->cckPhyErrBase = 0;
} else
params->cckPhyErrBase = AR_PHY_COUNTMAX - params->cckTrigHigh;
}
/*
* Setup ANI handling. Sets all thresholds and reset the
* channel statistics. Note that ar5416AniReset should be
* called by ar5416Reset before anything else happens and
* that's where we force initial settings.
*/
void
ar5416AniAttach(struct ath_hal *ah, const struct ar5212AniParams *params24,
const struct ar5212AniParams *params5, HAL_BOOL enable)
{
struct ath_hal_5212 *ahp = AH5212(ah);
if (params24 != AH_NULL) {
OS_MEMCPY(&ahp->ah_aniParams24, params24, sizeof(*params24));
setPhyErrBase(ah, &ahp->ah_aniParams24);
}
if (params5 != AH_NULL) {
OS_MEMCPY(&ahp->ah_aniParams5, params5, sizeof(*params5));
setPhyErrBase(ah, &ahp->ah_aniParams5);
}
OS_MEMZERO(ahp->ah_ani, sizeof(ahp->ah_ani));
/* Enable MIB Counters */
enableAniMIBCounters(ah, &ahp->ah_aniParams24 /*XXX*/);
if (enable) { /* Enable ani now */
HALASSERT(params24 != AH_NULL && params5 != AH_NULL);
ahp->ah_procPhyErr |= HAL_ANI_ENA;
} else {
ahp->ah_procPhyErr &= ~HAL_ANI_ENA;
}
}
/*
* Cleanup any ANI state setup.
*/
void
ar5416AniDetach(struct ath_hal *ah)
{
HALDEBUG(ah, HAL_DEBUG_ANI, "Detaching Ani\n");
disableAniMIBCounters(ah);
}
/*
* Control Adaptive Noise Immunity Parameters
*/
HAL_BOOL
ar5416AniControl(struct ath_hal *ah, HAL_ANI_CMD cmd, int param)
{
typedef int TABLE[];
struct ath_hal_5212 *ahp = AH5212(ah);
struct ar5212AniState *aniState = ahp->ah_curani;
const struct ar5212AniParams *params = aniState->params;
OS_MARK(ah, AH_MARK_ANI_CONTROL, cmd);
switch (cmd) {
case HAL_ANI_NOISE_IMMUNITY_LEVEL: {
u_int level = param;
if (level >= params->maxNoiseImmunityLevel) {
HALDEBUG(ah, HAL_DEBUG_ANY,
"%s: level out of range (%u > %u)\n",
__func__, level, params->maxNoiseImmunityLevel);
return AH_FALSE;
}
OS_REG_RMW_FIELD(ah, AR_PHY_DESIRED_SZ,
AR_PHY_DESIRED_SZ_TOT_DES, params->totalSizeDesired[level]);
OS_REG_RMW_FIELD(ah, AR_PHY_AGC_CTL1,
AR_PHY_AGC_CTL1_COARSE_LOW, params->coarseLow[level]);
OS_REG_RMW_FIELD(ah, AR_PHY_AGC_CTL1,
AR_PHY_AGC_CTL1_COARSE_HIGH, params->coarseHigh[level]);
OS_REG_RMW_FIELD(ah, AR_PHY_FIND_SIG,
AR_PHY_FIND_SIG_FIRPWR, params->firpwr[level]);
if (level > aniState->noiseImmunityLevel)
ahp->ah_stats.ast_ani_niup++;
else if (level < aniState->noiseImmunityLevel)
ahp->ah_stats.ast_ani_nidown++;
aniState->noiseImmunityLevel = level;
break;
}
case HAL_ANI_OFDM_WEAK_SIGNAL_DETECTION: {
static const TABLE m1ThreshLow = { 127, 50 };
static const TABLE m2ThreshLow = { 127, 40 };
static const TABLE m1Thresh = { 127, 0x4d };
static const TABLE m2Thresh = { 127, 0x40 };
static const TABLE m2CountThr = { 31, 16 };
static const TABLE m2CountThrLow = { 63, 48 };
u_int on = param ? 1 : 0;
OS_REG_RMW_FIELD(ah, AR_PHY_SFCORR_LOW,
AR_PHY_SFCORR_LOW_M1_THRESH_LOW, m1ThreshLow[on]);
OS_REG_RMW_FIELD(ah, AR_PHY_SFCORR_LOW,
AR_PHY_SFCORR_LOW_M2_THRESH_LOW, m2ThreshLow[on]);
OS_REG_RMW_FIELD(ah, AR_PHY_SFCORR,
AR_PHY_SFCORR_M1_THRESH, m1Thresh[on]);
OS_REG_RMW_FIELD(ah, AR_PHY_SFCORR,
AR_PHY_SFCORR_M2_THRESH, m2Thresh[on]);
OS_REG_RMW_FIELD(ah, AR_PHY_SFCORR,
AR_PHY_SFCORR_M2COUNT_THR, m2CountThr[on]);
OS_REG_RMW_FIELD(ah, AR_PHY_SFCORR_LOW,
AR_PHY_SFCORR_LOW_M2COUNT_THR_LOW, m2CountThrLow[on]);
OS_REG_RMW_FIELD(ah, AR_PHY_SFCORR_EXT,
AR_PHY_SFCORR_EXT_M1_THRESH_LOW, m1ThreshLow[on]);
OS_REG_RMW_FIELD(ah, AR_PHY_SFCORR_EXT,
AR_PHY_SFCORR_EXT_M2_THRESH_LOW, m2ThreshLow[on]);
OS_REG_RMW_FIELD(ah, AR_PHY_SFCORR_EXT,
AR_PHY_SFCORR_EXT_M1_THRESH, m1Thresh[on]);
OS_REG_RMW_FIELD(ah, AR_PHY_SFCORR_EXT,
AR_PHY_SFCORR_EXT_M2_THRESH, m2Thresh[on]);
if (on) {
OS_REG_SET_BIT(ah, AR_PHY_SFCORR_LOW,
AR_PHY_SFCORR_LOW_USE_SELF_CORR_LOW);
} else {
OS_REG_CLR_BIT(ah, AR_PHY_SFCORR_LOW,
AR_PHY_SFCORR_LOW_USE_SELF_CORR_LOW);
}
if (on)
ahp->ah_stats.ast_ani_ofdmon++;
else
ahp->ah_stats.ast_ani_ofdmoff++;
aniState->ofdmWeakSigDetectOff = !on;
break;
}
case HAL_ANI_CCK_WEAK_SIGNAL_THR: {
static const TABLE weakSigThrCck = { 8, 6 };
u_int high = param ? 1 : 0;
OS_REG_RMW_FIELD(ah, AR_PHY_CCK_DETECT,
AR_PHY_CCK_DETECT_WEAK_SIG_THR_CCK, weakSigThrCck[high]);
if (high)
ahp->ah_stats.ast_ani_cckhigh++;
else
ahp->ah_stats.ast_ani_ccklow++;
aniState->cckWeakSigThreshold = high;
break;
}
case HAL_ANI_FIRSTEP_LEVEL: {
u_int level = param;
if (level >= params->maxFirstepLevel) {
HALDEBUG(ah, HAL_DEBUG_ANY,
"%s: level out of range (%u > %u)\n",
__func__, level, params->maxFirstepLevel);
return AH_FALSE;
}
OS_REG_RMW_FIELD(ah, AR_PHY_FIND_SIG,
AR_PHY_FIND_SIG_FIRSTEP, params->firstep[level]);
if (level > aniState->firstepLevel)
ahp->ah_stats.ast_ani_stepup++;
else if (level < aniState->firstepLevel)
ahp->ah_stats.ast_ani_stepdown++;
aniState->firstepLevel = level;
break;
}
case HAL_ANI_SPUR_IMMUNITY_LEVEL: {
u_int level = param;
if (level >= params->maxSpurImmunityLevel) {
HALDEBUG(ah, HAL_DEBUG_ANY,
"%s: level out of range (%u > %u)\n",
__func__, level, params->maxSpurImmunityLevel);
return AH_FALSE;
}
OS_REG_RMW_FIELD(ah, AR_PHY_TIMING5,
AR_PHY_TIMING5_CYCPWR_THR1, params->cycPwrThr1[level]);
if (level > aniState->spurImmunityLevel)
ahp->ah_stats.ast_ani_spurup++;
else if (level < aniState->spurImmunityLevel)
ahp->ah_stats.ast_ani_spurdown++;
aniState->spurImmunityLevel = level;
break;
}
case HAL_ANI_PRESENT:
break;
case HAL_ANI_MODE:
if (param == 0) {
ahp->ah_procPhyErr &= ~HAL_ANI_ENA;
/* Turn off HW counters if we have them */
ar5416AniDetach(ah);
ar5212SetRxFilter(ah,
ar5212GetRxFilter(ah) &~ HAL_RX_FILTER_PHYERR);
} else { /* normal/auto mode */
/* don't mess with state if already enabled */
if (ahp->ah_procPhyErr & HAL_ANI_ENA)
break;
ar5212SetRxFilter(ah,
ar5212GetRxFilter(ah) &~ HAL_RX_FILTER_PHYERR);
/* Enable MIB Counters */
enableAniMIBCounters(ah, ahp->ah_curani != AH_NULL ?
ahp->ah_curani->params: &ahp->ah_aniParams24 /*XXX*/);
ahp->ah_procPhyErr |= HAL_ANI_ENA;
}
break;
#ifdef AH_PRIVATE_DIAG
case HAL_ANI_PHYERR_RESET:
ahp->ah_stats.ast_ani_ofdmerrs = 0;
ahp->ah_stats.ast_ani_cckerrs = 0;
break;
#endif /* AH_PRIVATE_DIAG */
default:
HALDEBUG(ah, HAL_DEBUG_ANY, "%s: invalid cmd %u\n",
__func__, cmd);
return AH_FALSE;
}
return AH_TRUE;
}
static void
ar5416AniOfdmErrTrigger(struct ath_hal *ah)
{
struct ath_hal_5212 *ahp = AH5212(ah);
HAL_CHANNEL_INTERNAL *chan = AH_PRIVATE(ah)->ah_curchan;
struct ar5212AniState *aniState;
const struct ar5212AniParams *params;
HALASSERT(chan != AH_NULL);
if (!ANI_ENA(ah))
return;
aniState = ahp->ah_curani;
params = aniState->params;
/* First, raise noise immunity level, up to max */
if (aniState->noiseImmunityLevel+1 < params->maxNoiseImmunityLevel) {
ar5416AniControl(ah, HAL_ANI_NOISE_IMMUNITY_LEVEL,
aniState->noiseImmunityLevel + 1);
return;
}
/* then, raise spur immunity level, up to max */
if (aniState->spurImmunityLevel+1 < params->maxSpurImmunityLevel) {
ar5416AniControl(ah, HAL_ANI_SPUR_IMMUNITY_LEVEL,
aniState->spurImmunityLevel + 1);
return;
}
if (ANI_ENA_RSSI(ah)) {
int32_t rssi = BEACON_RSSI(ahp);
if (rssi > params->rssiThrHigh) {
/*
* Beacon rssi is high, can turn off ofdm
* weak sig detect.
*/
if (!aniState->ofdmWeakSigDetectOff) {
ar5416AniControl(ah,
HAL_ANI_OFDM_WEAK_SIGNAL_DETECTION,
AH_FALSE);
ar5416AniControl(ah,
HAL_ANI_SPUR_IMMUNITY_LEVEL, 0);
return;
}
/*
* If weak sig detect is already off, as last resort,
* raise firstep level
*/
if (aniState->firstepLevel+1 < params->maxFirstepLevel) {
ar5416AniControl(ah, HAL_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel + 1);
return;
}
} else if (rssi > params->rssiThrLow) {
/*
* Beacon rssi in mid range, need ofdm weak signal
* detect, but we can raise firststepLevel.
*/
if (aniState->ofdmWeakSigDetectOff)
ar5416AniControl(ah,
HAL_ANI_OFDM_WEAK_SIGNAL_DETECTION,
AH_TRUE);
if (aniState->firstepLevel+1 < params->maxFirstepLevel)
ar5416AniControl(ah, HAL_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel + 1);
return;
} else {
/*
* Beacon rssi is low, if in 11b/g mode, turn off ofdm
* weak signal detection and zero firstepLevel to
* maximize CCK sensitivity
*/
/* XXX can optimize */
if (IS_CHAN_B(chan) || IS_CHAN_G(chan)) {
if (!aniState->ofdmWeakSigDetectOff)
ar5416AniControl(ah,
HAL_ANI_OFDM_WEAK_SIGNAL_DETECTION,
AH_FALSE);
if (aniState->firstepLevel > 0)
ar5416AniControl(ah,
HAL_ANI_FIRSTEP_LEVEL, 0);
return;
}
}
}
}
static void
ar5416AniCckErrTrigger(struct ath_hal *ah)
{
struct ath_hal_5212 *ahp = AH5212(ah);
HAL_CHANNEL_INTERNAL *chan = AH_PRIVATE(ah)->ah_curchan;
struct ar5212AniState *aniState;
const struct ar5212AniParams *params;
HALASSERT(chan != AH_NULL);
if (!ANI_ENA(ah))
return;
/* first, raise noise immunity level, up to max */
aniState = ahp->ah_curani;
params = aniState->params;
if (aniState->noiseImmunityLevel+1 < params->maxNoiseImmunityLevel) {
ar5416AniControl(ah, HAL_ANI_NOISE_IMMUNITY_LEVEL,
aniState->noiseImmunityLevel + 1);
return;
}
if (ANI_ENA_RSSI(ah)) {
int32_t rssi = BEACON_RSSI(ahp);
if (rssi > params->rssiThrLow) {
/*
* Beacon signal in mid and high range,
* raise firstep level.
*/
if (aniState->firstepLevel+1 < params->maxFirstepLevel)
ar5416AniControl(ah, HAL_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel + 1);
} else {
/*
* Beacon rssi is low, zero firstep level to maximize
* CCK sensitivity in 11b/g mode.
*/
/* XXX can optimize */
if (IS_CHAN_B(chan) || IS_CHAN_G(chan)) {
if (aniState->firstepLevel > 0)
ar5416AniControl(ah,
HAL_ANI_FIRSTEP_LEVEL, 0);
}
}
}
}
static void
ar5416AniRestart(struct ath_hal *ah, struct ar5212AniState *aniState)
{
struct ath_hal_5212 *ahp = AH5212(ah);
const struct ar5212AniParams *params = aniState->params;
aniState->listenTime = 0;
/*
* NB: these are written on reset based on the
* ini so we must re-write them!
*/
HALDEBUG(ah, HAL_DEBUG_ANI,
"%s: Writing ofdmbase=%u cckbase=%u\n", __func__,
params->ofdmPhyErrBase, params->cckPhyErrBase);
OS_REG_WRITE(ah, AR_PHY_ERR_1, params->ofdmPhyErrBase);
OS_REG_WRITE(ah, AR_PHY_ERR_2, params->cckPhyErrBase);
OS_REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
OS_REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_CCK_TIMING);
/* Clear the mib counters and save them in the stats */
ar5212UpdateMibCounters(ah, &ahp->ah_mibStats);
aniState->ofdmPhyErrCount = 0;
aniState->cckPhyErrCount = 0;
}
/*
* Restore/reset the ANI parameters and reset the statistics.
* This routine must be called for every channel change.
*
* NOTE: This is where ah_curani is set; other ani code assumes
* it is setup to reflect the current channel.
*/
void
ar5416AniReset(struct ath_hal *ah, HAL_CHANNEL_INTERNAL *chan,
HAL_OPMODE opmode, int restore)
{
struct ath_hal_5212 *ahp = AH5212(ah);
struct ar5212AniState *aniState;
uint32_t rxfilter;
int index;
index = ar5416GetAniChannelIndex(ah, chan);
aniState = &ahp->ah_ani[index];
ahp->ah_curani = aniState;
#if 0
ath_hal_printf(ah,"%s: chan %u/0x%x restore %d setup %d opmode %u\n",
__func__, chan->channel, chan->channelFlags, restore,
aniState->isSetup, opmode);
#else
HALDEBUG(ah, HAL_DEBUG_ANI,
"%s: chan %u/0x%x restore %d setup %d opmode %u\n",
__func__, chan->channel, chan->channelFlags, restore,
aniState->isSetup, opmode);
#endif
OS_MARK(ah, AH_MARK_ANI_RESET, opmode);
/*
* Turn off PHY error frame delivery while we futz with settings.
*/
rxfilter = ar5212GetRxFilter(ah);
ar5212SetRxFilter(ah, rxfilter &~ HAL_RX_FILTER_PHYERR);
/*
* Automatic processing is done only in station mode right now.
*/
if (opmode == HAL_M_STA)
ahp->ah_procPhyErr |= HAL_RSSI_ANI_ENA;
else
ahp->ah_procPhyErr &= ~HAL_RSSI_ANI_ENA;
/*
* Set all ani parameters. We either set them to initial
* values or restore the previous ones for the channel.
* XXX if ANI follows hardware, we don't care what mode we're
* XXX in, we should keep the ani parameters
*/
if (restore && aniState->isSetup) {
ar5416AniControl(ah, HAL_ANI_NOISE_IMMUNITY_LEVEL,
aniState->noiseImmunityLevel);
ar5416AniControl(ah, HAL_ANI_SPUR_IMMUNITY_LEVEL,
aniState->spurImmunityLevel);
ar5416AniControl(ah, HAL_ANI_OFDM_WEAK_SIGNAL_DETECTION,
!aniState->ofdmWeakSigDetectOff);
ar5416AniControl(ah, HAL_ANI_CCK_WEAK_SIGNAL_THR,
aniState->cckWeakSigThreshold);
ar5416AniControl(ah, HAL_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel);
} else {
ar5416AniControl(ah, HAL_ANI_NOISE_IMMUNITY_LEVEL, 0);
ar5416AniControl(ah, HAL_ANI_SPUR_IMMUNITY_LEVEL, 0);
ar5416AniControl(ah, HAL_ANI_OFDM_WEAK_SIGNAL_DETECTION,
AH_TRUE);
ar5416AniControl(ah, HAL_ANI_CCK_WEAK_SIGNAL_THR, AH_FALSE);
ar5416AniControl(ah, HAL_ANI_FIRSTEP_LEVEL, 0);
aniState->isSetup = AH_TRUE;
}
ar5416AniRestart(ah, aniState);
/* restore RX filter mask */
ar5212SetRxFilter(ah, rxfilter);
}
/*
* 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
ar5416ProcessMibIntr(struct ath_hal *ah, const HAL_NODE_STATS *stats)
{
struct ath_hal_5212 *ahp = AH5212(ah);
uint32_t phyCnt1, phyCnt2;
HALDEBUG(ah, HAL_DEBUG_ANI, "%s: mibc 0x%x phyCnt1 0x%x phyCnt2 0x%x "
"filtofdm 0x%x filtcck 0x%x\n",
__func__, OS_REG_READ(ah, AR_MIBC),
OS_REG_READ(ah, AR_PHYCNT1), OS_REG_READ(ah, AR_PHYCNT2),
OS_REG_READ(ah, AR_FILTOFDM), OS_REG_READ(ah, AR_FILTCCK));
/*
* First order of business is to clear whatever caused
* the interrupt so we don't keep getting interrupted.
* We have the usual mib counters that are reset-on-read
* and the additional counters that appeared starting in
* Hainan. We collect the mib counters and explicitly
* zero additional counters we are not using. Anything
* else is reset only if it caused the interrupt.
*/
/* NB: these are not reset-on-read */
phyCnt1 = OS_REG_READ(ah, AR_PHY_ERR_1);
phyCnt2 = OS_REG_READ(ah, AR_PHY_ERR_2);
/* not used, always reset them in case they are the cause */
OS_REG_WRITE(ah, AR_FILTOFDM, 0);
OS_REG_WRITE(ah, AR_FILTCCK, 0);
if ((OS_REG_READ(ah, AR_SLP_MIB_CTRL) & AR_SLP_MIB_PENDING) == 0)
OS_REG_WRITE(ah, AR_SLP_MIB_CTRL, AR_SLP_MIB_CLEAR);
/* Clear the mib counters and save them in the stats */
ar5212UpdateMibCounters(ah, &ahp->ah_mibStats);
ahp->ah_stats.ast_nodestats = *stats;
/*
* Check for an ani stat hitting the trigger threshold.
* When this happens we get a MIB interrupt and the top
* 2 bits of the counter register will be 0b11, hence
* the mask check of phyCnt?.
*/
if (((phyCnt1 & AR_MIBCNT_INTRMASK) == AR_MIBCNT_INTRMASK) ||
((phyCnt2 & AR_MIBCNT_INTRMASK) == AR_MIBCNT_INTRMASK)) {
struct ar5212AniState *aniState = ahp->ah_curani;
const struct ar5212AniParams *params = aniState->params;
uint32_t ofdmPhyErrCnt, cckPhyErrCnt;
ofdmPhyErrCnt = phyCnt1 - params->ofdmPhyErrBase;
ahp->ah_stats.ast_ani_ofdmerrs +=
ofdmPhyErrCnt - aniState->ofdmPhyErrCount;
aniState->ofdmPhyErrCount = ofdmPhyErrCnt;
cckPhyErrCnt = phyCnt2 - params->cckPhyErrBase;
ahp->ah_stats.ast_ani_cckerrs +=
cckPhyErrCnt - aniState->cckPhyErrCount;
aniState->cckPhyErrCount = cckPhyErrCnt;
/*
* NB: figure out which counter triggered. If both
* trigger we'll only deal with one as the processing
* clobbers the error counter so the trigger threshold
* check will never be true.
*/
if (aniState->ofdmPhyErrCount > params->ofdmTrigHigh)
ar5416AniOfdmErrTrigger(ah);
if (aniState->cckPhyErrCount > params->cckTrigHigh)
ar5416AniCckErrTrigger(ah);
/* NB: always restart to insure the h/w counters are reset */
ar5416AniRestart(ah, aniState);
}
}
static void
ar5416AniLowerImmunity(struct ath_hal *ah)
{
struct ath_hal_5212 *ahp = AH5212(ah);
struct ar5212AniState *aniState;
const struct ar5212AniParams *params;
HALASSERT(ANI_ENA(ah));
aniState = ahp->ah_curani;
params = aniState->params;
if (ANI_ENA_RSSI(ah)) {
int32_t rssi = BEACON_RSSI(ahp);
if (rssi > params->rssiThrHigh) {
/*
* Beacon signal is high, leave ofdm weak signal
* detection off or it may oscillate. Let it fall
* through.
*/
} else if (rssi > params->rssiThrLow) {
/*
* Beacon rssi in mid range, turn on ofdm weak signal
* detection or lower firstep level.
*/
if (aniState->ofdmWeakSigDetectOff) {
ar5416AniControl(ah,
HAL_ANI_OFDM_WEAK_SIGNAL_DETECTION,
AH_TRUE);
return;
}
if (aniState->firstepLevel > 0) {
ar5416AniControl(ah, HAL_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel - 1);
return;
}
} else {
/*
* Beacon rssi is low, reduce firstep level.
*/
if (aniState->firstepLevel > 0) {
ar5416AniControl(ah, HAL_ANI_FIRSTEP_LEVEL,
aniState->firstepLevel - 1);
return;
}
}
}
/* then lower spur immunity level, down to zero */
if (aniState->spurImmunityLevel > 0) {
ar5416AniControl(ah, HAL_ANI_SPUR_IMMUNITY_LEVEL,
aniState->spurImmunityLevel - 1);
return;
}
/*
* if all else fails, lower noise immunity level down to a min value
* zero for now
*/
if (aniState->noiseImmunityLevel > 0) {
ar5416AniControl(ah, HAL_ANI_NOISE_IMMUNITY_LEVEL,
aniState->noiseImmunityLevel - 1);
return;
}
}
#define CLOCK_RATE 44000 /* XXX use mac_usec or similar */
/* convert HW counter values to ms using 11g clock rate, goo9d enough
for 11a and Turbo */
/*
* Return an approximation of the time spent ``listening'' by
* deducting the cycles spent tx'ing and rx'ing from the total
* cycle count since our last call. A return value <0 indicates
* an invalid/inconsistent time.
*/
static int32_t
ar5416AniGetListenTime(struct ath_hal *ah)
{
struct ath_hal_5212 *ahp = AH5212(ah);
struct ar5212AniState *aniState;
uint32_t txFrameCount, rxFrameCount, cycleCount;
int32_t listenTime;
txFrameCount = OS_REG_READ(ah, AR_TFCNT);
rxFrameCount = OS_REG_READ(ah, AR_RFCNT);
cycleCount = OS_REG_READ(ah, AR_CCCNT);
aniState = ahp->ah_curani;
if (aniState->cycleCount == 0 || aniState->cycleCount > cycleCount) {
/*
* Cycle counter wrap (or initial call); it's not possible
* to accurately calculate a value because the registers
* right shift rather than wrap--so punt and return 0.
*/
listenTime = 0;
ahp->ah_stats.ast_ani_lzero++;
} else {
int32_t ccdelta = cycleCount - aniState->cycleCount;
int32_t rfdelta = rxFrameCount - aniState->rxFrameCount;
int32_t tfdelta = txFrameCount - aniState->txFrameCount;
listenTime = (ccdelta - rfdelta - tfdelta) / CLOCK_RATE;
}
aniState->cycleCount = cycleCount;
aniState->txFrameCount = txFrameCount;
aniState->rxFrameCount = rxFrameCount;
return listenTime;
}
/*
* Update ani stats in preparation for listen time processing.
*/
static void
updateMIBStats(struct ath_hal *ah, struct ar5212AniState *aniState)
{
struct ath_hal_5212 *ahp = AH5212(ah);
const struct ar5212AniParams *params = aniState->params;
uint32_t phyCnt1, phyCnt2;
int32_t ofdmPhyErrCnt, cckPhyErrCnt;
/* Clear the mib counters and save them in the stats */
ar5212UpdateMibCounters(ah, &ahp->ah_mibStats);
/* NB: these are not reset-on-read */
phyCnt1 = OS_REG_READ(ah, AR_PHY_ERR_1);
phyCnt2 = OS_REG_READ(ah, AR_PHY_ERR_2);
/* NB: these are spec'd to never roll-over */
ofdmPhyErrCnt = phyCnt1 - params->ofdmPhyErrBase;
if (ofdmPhyErrCnt < 0) {
HALDEBUG(ah, HAL_DEBUG_ANI, "OFDM phyErrCnt %d phyCnt1 0x%x\n",
ofdmPhyErrCnt, phyCnt1);
ofdmPhyErrCnt = AR_PHY_COUNTMAX;
}
ahp->ah_stats.ast_ani_ofdmerrs +=
ofdmPhyErrCnt - aniState->ofdmPhyErrCount;
aniState->ofdmPhyErrCount = ofdmPhyErrCnt;
cckPhyErrCnt = phyCnt2 - params->cckPhyErrBase;
if (cckPhyErrCnt < 0) {
HALDEBUG(ah, HAL_DEBUG_ANI, "CCK phyErrCnt %d phyCnt2 0x%x\n",
cckPhyErrCnt, phyCnt2);
cckPhyErrCnt = AR_PHY_COUNTMAX;
}
ahp->ah_stats.ast_ani_cckerrs +=
cckPhyErrCnt - aniState->cckPhyErrCount;
aniState->cckPhyErrCount = cckPhyErrCnt;
}
/*
* Do periodic processing. This routine is called from the
* driver's rx interrupt handler after processing frames.
*/
void
ar5416AniPoll(struct ath_hal *ah, const HAL_NODE_STATS *stats,
HAL_CHANNEL *chan)
{
struct ath_hal_5212 *ahp = AH5212(ah);
struct ar5212AniState *aniState = ahp->ah_curani;
const struct ar5212AniParams *params;
int32_t listenTime;
ahp->ah_stats.ast_nodestats.ns_avgbrssi = stats->ns_avgbrssi;
/* XXX can aniState be null? */
if (aniState == AH_NULL)
return;
if (!ANI_ENA(ah))
return;
listenTime = ar5416AniGetListenTime(ah);
if (listenTime < 0) {
ahp->ah_stats.ast_ani_lneg++;
/* restart ANI period if listenTime is invalid */
ar5416AniRestart(ah, aniState);
}
/* XXX beware of overflow? */
aniState->listenTime += listenTime;
OS_MARK(ah, AH_MARK_ANI_POLL, aniState->listenTime);
params = aniState->params;
if (aniState->listenTime > 5*params->period) {
/*
* Check to see if need to lower immunity if
* 5 aniPeriods have passed
*/
updateMIBStats(ah, aniState);
if (aniState->ofdmPhyErrCount <= aniState->listenTime *
params->ofdmTrigLow/1000 &&
aniState->cckPhyErrCount <= aniState->listenTime *
params->cckTrigLow/1000)
ar5416AniLowerImmunity(ah);
ar5416AniRestart(ah, aniState);
} else if (aniState->listenTime > params->period) {
updateMIBStats(ah, aniState);
/* check to see if need to raise immunity */
if (aniState->ofdmPhyErrCount > aniState->listenTime *
params->ofdmTrigHigh / 1000) {
ar5416AniOfdmErrTrigger(ah);
ar5416AniRestart(ah, aniState);
} else if (aniState->cckPhyErrCount > aniState->listenTime *
params->cckTrigHigh / 1000) {
ar5416AniCckErrTrigger(ah);
ar5416AniRestart(ah, aniState);
}
}
}
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