1 files changed, 555 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/link.c b/drivers/net/wireless/ath/ath9k/link.c
new file mode 100644
index 000000000000..d4549e9aac5c
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/link.c
@@ -0,0 +1,555 @@
+/*
+ * 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;
+
+	if (!caldata)
+		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;
+
+		ath_dbg(common, CALIBRATE,
+			"Sending PAPRD frame for thermal measurement on chain %d\n",
+			chain);
+		if (!ath_paprd_send_frame(sc, skb, chain))
+			goto fail_paprd;
+
+		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;
+		}
+
+		if (ar9003_paprd_create_curve(ah, caldata, chain)) {
+			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)
+		goto set_timer;
+
+	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 ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_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;
+}