| /* |
| * 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. |
| */ |
| void ath_tx_complete_poll_work(struct work_struct *work) |
| { |
| struct ath_softc *sc = container_of(work, struct ath_softc, |
| tx_complete_work.work); |
| struct ath_txq *txq; |
| int i; |
| bool needreset = false; |
| #ifdef CONFIG_ATH9K_DEBUGFS |
| sc->tx_complete_poll_work_seen++; |
| #endif |
| |
| for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) |
| if (ATH_TXQ_SETUP(sc, i)) { |
| txq = &sc->tx.txq[i]; |
| ath_txq_lock(sc, txq); |
| if (txq->axq_depth) { |
| if (txq->axq_tx_inprogress) { |
| needreset = true; |
| ath_txq_unlock(sc, txq); |
| break; |
| } else { |
| txq->axq_tx_inprogress = true; |
| } |
| } |
| ath_txq_unlock_complete(sc, txq); |
| } |
| |
| if (needreset) { |
| ath_dbg(ath9k_hw_common(sc->sc_ah), RESET, |
| "tx hung, resetting the chip\n"); |
| ath9k_queue_reset(sc, RESET_TYPE_TX_HANG); |
| return; |
| } |
| |
| ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work, |
| msecs_to_jiffies(ATH_TX_COMPLETE_POLL_INT)); |
| } |
| |
| /* |
| * Checks if the BB/MAC is hung. |
| */ |
| void ath_hw_check(struct work_struct *work) |
| { |
| struct ath_softc *sc = container_of(work, struct ath_softc, hw_check_work); |
| struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
| unsigned long flags; |
| int busy; |
| u8 is_alive, nbeacon = 1; |
| enum ath_reset_type type; |
| |
| ath9k_ps_wakeup(sc); |
| is_alive = ath9k_hw_check_alive(sc->sc_ah); |
| |
| if (is_alive && !AR_SREV_9300(sc->sc_ah)) |
| goto out; |
| else if (!is_alive && AR_SREV_9300(sc->sc_ah)) { |
| ath_dbg(common, RESET, |
| "DCU stuck is detected. Schedule chip reset\n"); |
| type = RESET_TYPE_MAC_HANG; |
| goto sched_reset; |
| } |
| |
| spin_lock_irqsave(&common->cc_lock, flags); |
| busy = ath_update_survey_stats(sc); |
| spin_unlock_irqrestore(&common->cc_lock, flags); |
| |
| ath_dbg(common, RESET, "Possible baseband hang, busy=%d (try %d)\n", |
| busy, sc->hw_busy_count + 1); |
| if (busy >= 99) { |
| if (++sc->hw_busy_count >= 3) { |
| type = RESET_TYPE_BB_HANG; |
| goto sched_reset; |
| } |
| } else if (busy >= 0) { |
| sc->hw_busy_count = 0; |
| nbeacon = 3; |
| } |
| |
| ath_start_rx_poll(sc, nbeacon); |
| goto out; |
| |
| sched_reset: |
| ath9k_queue_reset(sc, type); |
| out: |
| ath9k_ps_restore(sc); |
| } |
| |
| /* |
| * 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 >= 0x40000) { |
| 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); |
| /* |
| * 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(SC_OP_BEACONS, &sc->sc_flags)) |
| 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)); |
| } |
| |
| /* |
| * RX Polling - monitors baseband hangs. |
| */ |
| void ath_start_rx_poll(struct ath_softc *sc, u8 nbeacon) |
| { |
| if (!AR_SREV_9300(sc->sc_ah)) |
| return; |
| |
| if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) |
| return; |
| |
| mod_timer(&sc->rx_poll_timer, jiffies + msecs_to_jiffies |
| (nbeacon * sc->cur_beacon_conf.beacon_interval)); |
| } |
| |
| void ath_rx_poll(unsigned long data) |
| { |
| struct ath_softc *sc = (struct ath_softc *)data; |
| |
| ieee80211_queue_work(sc->hw, &sc->hw_check_work); |
| } |
| |
| /* |
| * PA Pre-distortion. |
| */ |
| static void ath_paprd_activate(struct ath_softc *sc) |
| { |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath9k_hw_cal_data *caldata = ah->caldata; |
| int chain; |
| |
| if (!caldata || !caldata->paprd_done) |
| return; |
| |
| ath9k_ps_wakeup(sc); |
| 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); |
| } |
| |
| ar9003_paprd_enable(ah, true); |
| ath9k_ps_restore(sc); |
| } |
| |
| 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; |
| int time_left; |
| |
| memset(&txctl, 0, sizeof(txctl)); |
| txctl.txq = sc->tx.txq_map[WME_AC_BE]; |
| |
| memset(tx_info, 0, sizeof(*tx_info)); |
| tx_info->band = hw->conf.channel->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 || !caldata->paprd_packet_sent || caldata->paprd_done) |
| 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) { |
| caldata->paprd_done = true; |
| 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(unsigned long data) |
| { |
| struct ath_softc *sc = (struct ath_softc *)data; |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath_common *common = ath9k_hw_common(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 && ah->caldata->nfcal_interference) |
| 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 (sc->sc_ah->config.enable_ani |
| && (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) { |
| common->ani.caldone = |
| ath9k_hw_calibrate(ah, ah->curchan, |
| ah->rxchainmask, longcal); |
| } |
| |
| 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_debug_samp_bb_mac(sc); |
| 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; |
| if (sc->sc_ah->config.enable_ani) |
| 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 (ah->eep_ops->get_eeprom(ah, EEP_PAPRD) && ah->caldata) { |
| if (!ah->caldata->paprd_done) |
| ieee80211_queue_work(sc->hw, &sc->paprd_work); |
| else if (!ah->paprd_table_write_done) |
| ath_paprd_activate(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(SC_OP_ANI_RUN, &sc->sc_flags) || |
| (sc->hw->conf.flags & IEEE80211_CONF_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"); |
| del_timer_sync(&common->ani.timer); |
| } |
| |
| void ath_check_ani(struct ath_softc *sc) |
| { |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; |
| |
| /* |
| * 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(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) |
| goto stop_ani; |
| } |
| } else if (ah->opmode == NL80211_IFTYPE_STATION) { |
| if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) |
| goto stop_ani; |
| } |
| |
| if (!test_bit(SC_OP_ANI_RUN, &sc->sc_flags)) { |
| set_bit(SC_OP_ANI_RUN, &sc->sc_flags); |
| ath_start_ani(sc); |
| } |
| |
| return; |
| |
| stop_ani: |
| clear_bit(SC_OP_ANI_RUN, &sc->sc_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); |
| } |
| } |
| |
| /* |
| * 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_CHANNEL_TIME | |
| SURVEY_INFO_CHANNEL_TIME_BUSY | |
| SURVEY_INFO_CHANNEL_TIME_RX | |
| SURVEY_INFO_CHANNEL_TIME_TX; |
| survey->channel_time += cc->cycles / div; |
| survey->channel_time_busy += cc->rx_busy / div; |
| survey->channel_time_rx += cc->rx_frame / div; |
| survey->channel_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; |
| } |