--- /dev/null
+/*
+ * 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;
+
+
+ if (sc->tx99_state) {
+ ath_dbg(ath9k_hw_common(sc->sc_ah), RESET,
+ "skip tx hung detection on tx99\n");
+ return;
+ }
+
+ 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) {
+ needreset = true;
+ ath_txq_unlock(sc, txq);
+ break;
+ } else {
+ txq->axq_tx_inprogress = true;
+ }
+ }
+ ath_txq_unlock(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.
+ */
+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 >= 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);
+ 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;
+ int 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(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 && 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(&common->cc_lock);
+ ath9k_hw_ani_monitor(ah, ah->curchan);
+ ath_update_survey_stats(sc);
+ spin_unlock(&common->cc_lock);
+ }
+
+ /* 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");
+ del_timer_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;
+}
Code Review / kvmfornfv.git / blobdiff