/*
* Copyright ( c ) 2012 Qualcomm Atheros , 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 "ath9k.h"
/*
* TX polling - checks if the TX engine is stuck somewhere
* and issues a chip reset if so .
*/
static bool ath_tx_complete_check(struct ath_softc *sc)
{
struct ath_txq *txq;
int i;
if (sc->tx99_state)
return true ;
for (i = 0 ; i < IEEE80211_NUM_ACS; i++) {
txq = sc->tx.txq_map[i];
ath_txq_lock(sc, txq);
if (txq->axq_depth) {
if (txq->axq_tx_inprogress) {
ath_txq_unlock(sc, txq);
goto reset;
}
txq->axq_tx_inprogress = true ;
}
ath_txq_unlock(sc, txq);
}
return true ;
reset:
ath_dbg(ath9k_hw_common(sc->sc_ah), RESET,
"tx hung, resetting the chip\n" );
ath9k_queue_reset(sc, RESET_TYPE_TX_HANG);
return false ;
}
#define RX_INACTIVE_CHECK_INTERVAL (4 * MSEC_PER_SEC)
static bool ath_hw_rx_inactive_check(struct ath_softc *sc)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
u32 interval, count;
interval = jiffies_to_msecs(jiffies - sc->rx_active_check_time);
count = sc->rx_active_count;
if (interval < RX_INACTIVE_CHECK_INTERVAL)
return true ; /* too soon to check */
sc->rx_active_count = 0 ;
sc->rx_active_check_time = jiffies;
/* Need at least one interrupt per second, and we should only react if
* we are within a factor two of the expected interval
*/
if (interval > RX_INACTIVE_CHECK_INTERVAL * 2 ||
count >= interval / MSEC_PER_SEC)
return true ;
ath_dbg(common, RESET,
"RX inactivity detected. Schedule chip reset\n" );
ath9k_queue_reset(sc, RESET_TYPE_RX_INACTIVE);
return false ;
}
void ath_hw_check_work(struct work_struct *work)
{
struct ath_softc *sc = container_of(work, struct ath_softc,
hw_check_work.work);
if (!ath_hw_check(sc) || !ath_tx_complete_check(sc) ||
!ath_hw_rx_inactive_check(sc))
return ;
ieee80211_queue_delayed_work(sc->hw, &sc->hw_check_work,
msecs_to_jiffies(ATH_HW_CHECK_POLL_INT));
}
/*
* Checks if the BB / MAC is hung .
*/
bool ath_hw_check(struct ath_softc *sc)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
enum ath_reset_type type;
bool is_alive;
ath9k_ps_wakeup(sc);
is_alive = ath9k_hw_check_alive(sc->sc_ah);
if (!is_alive) {
ath_dbg(common, RESET,
"HW hang detected, schedule chip reset\n" );
type = RESET_TYPE_MAC_HANG;
ath9k_queue_reset(sc, type);
}
ath9k_ps_restore(sc);
return is_alive;
}
/*
* PLL - WAR for AR9485 / AR9340
*/
static bool ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum)
{
static int count;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
if (pll_sqsum >= 0 x40000) {
count++;
if (count == 3 ) {
ath_dbg(common, RESET, "PLL WAR, resetting the chip\n" );
ath9k_queue_reset(sc, RESET_TYPE_PLL_HANG);
count = 0 ;
return true ;
}
} else {
count = 0 ;
}
return false ;
}
void ath_hw_pll_work(struct work_struct *work)
{
u32 pll_sqsum;
struct ath_softc *sc = container_of(work, struct ath_softc,
hw_pll_work.work);
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
/*
* ensure that the PLL WAR is executed only
* after the STA is associated ( or ) if the
* beaconing had started in interfaces that
* uses beacons .
*/
if (!test_bit(ATH_OP_BEACONS, &common->op_flags))
return ;
if (sc->tx99_state)
return ;
ath9k_ps_wakeup(sc);
pll_sqsum = ar9003_get_pll_sqsum_dvc(sc->sc_ah);
ath9k_ps_restore(sc);
if (ath_hw_pll_rx_hang_check(sc, pll_sqsum))
return ;
ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work,
msecs_to_jiffies(ATH_PLL_WORK_INTERVAL));
}
/*
* PA Pre - distortion .
*/
static void ath_paprd_activate(struct ath_softc *sc)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath9k_hw_cal_data *caldata = ah->caldata;
int chain;
if (!caldata || !test_bit(PAPRD_DONE, &caldata->cal_flags)) {
ath_dbg(common, CALIBRATE, "Failed to activate PAPRD\n" );
return ;
}
ar9003_paprd_enable(ah, false );
for (chain = 0 ; chain < AR9300_MAX_CHAINS; chain++) {
if (!(ah->txchainmask & BIT(chain)))
continue ;
ar9003_paprd_populate_single_table(ah, caldata, chain);
}
ath_dbg(common, CALIBRATE, "Activating PAPRD\n" );
ar9003_paprd_enable(ah, true );
}
static bool ath_paprd_send_frame(struct ath_softc *sc, struct sk_buff *skb, int chain)
{
struct ieee80211_hw *hw = sc->hw;
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath_tx_control txctl;
unsigned long time_left;
memset(&txctl, 0 , sizeof (txctl));
txctl.txq = sc->tx.txq_map[IEEE80211_AC_BE];
memset(tx_info, 0 , sizeof (*tx_info));
tx_info->band = sc->cur_chandef.chan->band;
tx_info->flags |= IEEE80211_TX_CTL_NO_ACK;
tx_info->control.rates[0 ].idx = 0 ;
tx_info->control.rates[0 ].count = 1 ;
tx_info->control.rates[0 ].flags = IEEE80211_TX_RC_MCS;
tx_info->control.rates[1 ].idx = -1 ;
init_completion(&sc->paprd_complete);
txctl.paprd = BIT(chain);
if (ath_tx_start(hw, skb, &txctl) != 0 ) {
ath_dbg(common, CALIBRATE, "PAPRD TX failed\n" );
dev_kfree_skb_any(skb);
return false ;
}
time_left = wait_for_completion_timeout(&sc->paprd_complete,
msecs_to_jiffies(ATH_PAPRD_TIMEOUT));
if (!time_left)
ath_dbg(common, CALIBRATE,
"Timeout waiting for paprd training on TX chain %d\n" ,
chain);
return !!time_left;
}
void ath_paprd_calibrate(struct work_struct *work)
{
struct ath_softc *sc = container_of(work, struct ath_softc, paprd_work);
struct ieee80211_hw *hw = sc->hw;
struct ath_hw *ah = sc->sc_ah;
struct ieee80211_hdr *hdr;
struct sk_buff *skb = NULL;
struct ath9k_hw_cal_data *caldata = ah->caldata;
struct ath_common *common = ath9k_hw_common(ah);
int ftype;
int chain_ok = 0 ;
int chain;
int len = 1800 ;
int ret;
if (!caldata ||
!test_bit(PAPRD_PACKET_SENT, &caldata->cal_flags) ||
test_bit(PAPRD_DONE, &caldata->cal_flags)) {
ath_dbg(common, CALIBRATE, "Skipping PAPRD calibration\n" );
return ;
}
ath9k_ps_wakeup(sc);
if (ar9003_paprd_init_table(ah) < 0 )
goto fail_paprd;
skb = alloc_skb(len, GFP_KERNEL);
if (!skb)
goto fail_paprd;
skb_put(skb, len);
memset(skb->data, 0 , len);
hdr = (struct ieee80211_hdr *)skb->data;
ftype = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC;
hdr->frame_control = cpu_to_le16(ftype);
hdr->duration_id = cpu_to_le16(10 );
memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN);
memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);
for (chain = 0 ; chain < AR9300_MAX_CHAINS; chain++) {
if (!(ah->txchainmask & BIT(chain)))
continue ;
chain_ok = 0 ;
ar9003_paprd_setup_gain_table(ah, chain);
ath_dbg(common, CALIBRATE,
"Sending PAPRD training frame on chain %d\n" , chain);
if (!ath_paprd_send_frame(sc, skb, chain))
goto fail_paprd;
if (!ar9003_paprd_is_done(ah)) {
ath_dbg(common, CALIBRATE,
"PAPRD not yet done on chain %d\n" , chain);
break ;
}
ret = ar9003_paprd_create_curve(ah, caldata, chain);
if (ret == -EINPROGRESS) {
ath_dbg(common, CALIBRATE,
"PAPRD curve on chain %d needs to be re-trained\n" ,
chain);
break ;
} else if (ret) {
ath_dbg(common, CALIBRATE,
"PAPRD create curve failed on chain %d\n" ,
chain);
break ;
}
chain_ok = 1 ;
}
kfree_skb(skb);
if (chain_ok) {
set_bit(PAPRD_DONE, &caldata->cal_flags);
ath_paprd_activate(sc);
}
fail_paprd:
ath9k_ps_restore(sc);
}
/*
* ANI performs periodic noise floor calibration
* that is used to adjust and optimize the chip performance . This
* takes environmental changes ( location , temperature ) into account .
* When the task is complete , it reschedules itself depending on the
* appropriate interval that was calculated .
*/
void ath_ani_calibrate(struct timer_list *t)
{
struct ath_common *common = timer_container_of(common, t, ani.timer);
struct ath_softc *sc = common->priv;
struct ath_hw *ah = sc->sc_ah;
bool longcal = false ;
bool shortcal = false ;
bool aniflag = false ;
unsigned int timestamp = jiffies_to_msecs(jiffies);
u32 cal_interval, short_cal_interval, long_cal_interval;
unsigned long flags;
if (ah->caldata && test_bit(NFCAL_INTF, &ah->caldata->cal_flags))
long_cal_interval = ATH_LONG_CALINTERVAL_INT;
else
long_cal_interval = ATH_LONG_CALINTERVAL;
short_cal_interval = (ah->opmode == NL80211_IFTYPE_AP) ?
ATH_AP_SHORT_CALINTERVAL : ATH_STA_SHORT_CALINTERVAL;
/* Only calibrate if awake */
if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE) {
if (++ah->ani_skip_count >= ATH_ANI_MAX_SKIP_COUNT) {
spin_lock_irqsave(&sc->sc_pm_lock, flags);
sc->ps_flags |= PS_WAIT_FOR_ANI;
spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
}
goto set_timer;
}
ah->ani_skip_count = 0 ;
spin_lock_irqsave(&sc->sc_pm_lock, flags);
sc->ps_flags &= ~PS_WAIT_FOR_ANI;
spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
ath9k_ps_wakeup(sc);
/* Long calibration runs independently of short calibration. */
if ((timestamp - common->ani.longcal_timer) >= long_cal_interval) {
longcal = true ;
common->ani.longcal_timer = timestamp;
}
/* Short calibration applies only while caldone is false */
if (!common->ani.caldone) {
if ((timestamp - common->ani.shortcal_timer) >= short_cal_interval) {
shortcal = true ;
common->ani.shortcal_timer = timestamp;
common->ani.resetcal_timer = timestamp;
}
} else {
if ((timestamp - common->ani.resetcal_timer) >=
ATH_RESTART_CALINTERVAL) {
common->ani.caldone = ath9k_hw_reset_calvalid(ah);
if (common->ani.caldone)
common->ani.resetcal_timer = timestamp;
}
}
/* Verify whether we must check ANI */
if ((timestamp - common->ani.checkani_timer) >= ah->config.ani_poll_interval) {
aniflag = true ;
common->ani.checkani_timer = timestamp;
}
/* Call ANI routine if necessary */
if (aniflag) {
spin_lock_irqsave(&common->cc_lock, flags);
ath9k_hw_ani_monitor(ah, ah->curchan);
ath_update_survey_stats(sc);
spin_unlock_irqrestore(&common->cc_lock, flags);
}
/* Perform calibration if necessary */
if (longcal || shortcal) {
int ret = ath9k_hw_calibrate(ah, ah->curchan, ah->rxchainmask,
longcal);
if (ret < 0 ) {
common->ani.caldone = 0 ;
ath9k_queue_reset(sc, RESET_TYPE_CALIBRATION);
return ;
}
common->ani.caldone = ret;
}
ath_dbg(common, ANI,
"Calibration @%lu finished: %s %s %s, caldone: %s\n" ,
jiffies,
longcal ? "long" : "" , shortcal ? "short" : "" ,
aniflag ? "ani" : "" , common->ani.caldone ? "true" : "false" );
ath9k_ps_restore(sc);
set_timer:
/*
* Set timer interval based on previous results .
* The interval must be the shortest necessary to satisfy ANI ,
* short calibration and long calibration .
*/
cal_interval = ATH_LONG_CALINTERVAL;
cal_interval = min(cal_interval, (u32)ah->config.ani_poll_interval);
if (!common->ani.caldone)
cal_interval = min(cal_interval, (u32)short_cal_interval);
mod_timer(&common->ani.timer, jiffies + msecs_to_jiffies(cal_interval));
if (ar9003_is_paprd_enabled(ah) && ah->caldata) {
if (!test_bit(PAPRD_DONE, &ah->caldata->cal_flags)) {
ieee80211_queue_work(sc->hw, &sc->paprd_work);
} else if (!ah->paprd_table_write_done) {
ath9k_ps_wakeup(sc);
ath_paprd_activate(sc);
ath9k_ps_restore(sc);
}
}
}
void ath_start_ani(struct ath_softc *sc)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
unsigned long timestamp = jiffies_to_msecs(jiffies);
if (common->disable_ani ||
!test_bit(ATH_OP_ANI_RUN, &common->op_flags) ||
sc->cur_chan->offchannel)
return ;
common->ani.longcal_timer = timestamp;
common->ani.shortcal_timer = timestamp;
common->ani.checkani_timer = timestamp;
ath_dbg(common, ANI, "Starting ANI\n" );
mod_timer(&common->ani.timer,
jiffies + msecs_to_jiffies((u32)ah->config.ani_poll_interval));
}
void ath_stop_ani(struct ath_softc *sc)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
ath_dbg(common, ANI, "Stopping ANI\n" );
timer_delete_sync(&common->ani.timer);
}
void ath_check_ani(struct ath_softc *sc)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
/*
* Check for the various conditions in which ANI has to
* be stopped .
*/
if (ah->opmode == NL80211_IFTYPE_ADHOC) {
if (!cur_conf->enable_beacon)
goto stop_ani;
} else if (ah->opmode == NL80211_IFTYPE_AP) {
if (!cur_conf->enable_beacon) {
/*
* Disable ANI only when there are no
* associated stations .
*/
if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags))
goto stop_ani;
}
} else if (ah->opmode == NL80211_IFTYPE_STATION) {
if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags))
goto stop_ani;
}
if (!test_bit(ATH_OP_ANI_RUN, &common->op_flags)) {
set_bit(ATH_OP_ANI_RUN, &common->op_flags);
ath_start_ani(sc);
}
return ;
stop_ani:
clear_bit(ATH_OP_ANI_RUN, &common->op_flags);
ath_stop_ani(sc);
}
void ath_update_survey_nf(struct ath_softc *sc, int channel)
{
struct ath_hw *ah = sc->sc_ah;
struct ath9k_channel *chan = &ah->channels[channel];
struct survey_info *survey = &sc->survey[channel];
if (chan->noisefloor) {
survey->filled |= SURVEY_INFO_NOISE_DBM;
survey->noise = ath9k_hw_getchan_noise(ah, chan,
chan->noisefloor);
}
}
/*
* Updates the survey statistics and returns the busy time since last
* update in % , if the measurement duration was long enough for the
* result to be useful , - 1 otherwise .
*/
int ath_update_survey_stats(struct ath_softc *sc)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
int pos = ah->curchan - &ah->channels[0 ];
struct survey_info *survey = &sc->survey[pos];
struct ath_cycle_counters *cc = &common->cc_survey;
unsigned int div = common->clockrate * 1000 ;
int ret = 0 ;
if (!ah->curchan)
return -1 ;
if (ah->power_mode == ATH9K_PM_AWAKE)
ath_hw_cycle_counters_update(common);
if (cc->cycles > 0 ) {
survey->filled |= SURVEY_INFO_TIME |
SURVEY_INFO_TIME_BUSY |
SURVEY_INFO_TIME_RX |
SURVEY_INFO_TIME_TX;
survey->time += cc->cycles / div;
survey->time_busy += cc->rx_busy / div;
survey->time_rx += cc->rx_frame / div;
survey->time_tx += cc->tx_frame / div;
}
if (cc->cycles < div)
return -1 ;
if (cc->cycles > 0 )
ret = cc->rx_busy * 100 / cc->cycles;
memset(cc, 0 , sizeof (*cc));
ath_update_survey_nf(sc, pos);
return ret;
}
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