drivers/net/wireless/ath/ath9k/main.c

   1 /*
   2  * Copyright (c) 2008-2011 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/nl80211.h>
  18 #include <linux/delay.h>
  19 #include "ath9k.h"
  20 #include "btcoex.h"
  21
  22 static u8 parse_mpdudensity(u8 mpdudensity)
  23 {
  24         /*
  25          * 802.11n D2.0 defined values for "Minimum MPDU Start Spacing":
  26          *   0 for no restriction
  27          *   1 for 1/4 us
  28          *   2 for 1/2 us
  29          *   3 for 1 us
  30          *   4 for 2 us
  31          *   5 for 4 us
  32          *   6 for 8 us
  33          *   7 for 16 us
  34          */
  35         switch (mpdudensity) {
  36         case 0:
  37                 return 0;
  38         case 1:
  39         case 2:
  40         case 3:
  41                 /* Our lower layer calculations limit our precision to
  42                    1 microsecond */
  43                 return 1;
  44         case 4:
  45                 return 2;
  46         case 5:
  47                 return 4;
  48         case 6:
  49                 return 8;
  50         case 7:
  51                 return 16;
  52         default:
  53                 return 0;
  54         }
  55 }
  56
  57 static bool ath9k_has_pending_frames(struct ath_softc *sc, struct ath_txq *txq)
  58 {
  59         bool pending = false;
  60
  61         spin_lock_bh(&txq->axq_lock);
  62
  63         if (txq->axq_depth || !list_empty(&txq->axq_acq))
  64                 pending = true;
  65
  66         spin_unlock_bh(&txq->axq_lock);
  67         return pending;
  68 }
  69
  70 static bool ath9k_setpower(struct ath_softc *sc, enum ath9k_power_mode mode)
  71 {
  72         unsigned long flags;
  73         bool ret;
  74
  75         spin_lock_irqsave(&sc->sc_pm_lock, flags);
  76         ret = ath9k_hw_setpower(sc->sc_ah, mode);
  77         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
  78
  79         return ret;
  80 }
  81
  82 void ath9k_ps_wakeup(struct ath_softc *sc)
  83 {
  84         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  85         unsigned long flags;
  86         enum ath9k_power_mode power_mode;
  87
  88         spin_lock_irqsave(&sc->sc_pm_lock, flags);
  89         if (++sc->ps_usecount != 1)
  90                 goto unlock;
  91
  92         power_mode = sc->sc_ah->power_mode;
  93         ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_AWAKE);
  94
  95         /*
  96          * While the hardware is asleep, the cycle counters contain no
  97          * useful data. Better clear them now so that they don't mess up
  98          * survey data results.
  99          */
 100         if (power_mode != ATH9K_PM_AWAKE) {
 101                 spin_lock(&common->cc_lock);
 102                 ath_hw_cycle_counters_update(common);
 103                 memset(&common->cc_survey, 0, sizeof(common->cc_survey));
 104                 spin_unlock(&common->cc_lock);
 105         }
 106
 107  unlock:
 108         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 109 }
 110
 111 void ath9k_ps_restore(struct ath_softc *sc)
 112 {
 113         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 114         unsigned long flags;
 115
 116         spin_lock_irqsave(&sc->sc_pm_lock, flags);
 117         if (--sc->ps_usecount != 0)
 118                 goto unlock;
 119
 120         spin_lock(&common->cc_lock);
 121         ath_hw_cycle_counters_update(common);
 122         spin_unlock(&common->cc_lock);
 123
 124         if (sc->ps_idle)
 125                 ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_FULL_SLEEP);
 126         else if (sc->ps_enabled &&
 127                  !(sc->ps_flags & (PS_WAIT_FOR_BEACON |
 128                               PS_WAIT_FOR_CAB |
 129                               PS_WAIT_FOR_PSPOLL_DATA |
 130                               PS_WAIT_FOR_TX_ACK)))
 131                 ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_NETWORK_SLEEP);
 132
 133  unlock:
 134         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 135 }
 136
 137 void ath_start_ani(struct ath_common *common)
 138 {
 139         struct ath_hw *ah = common->ah;
 140         unsigned long timestamp = jiffies_to_msecs(jiffies);
 141         struct ath_softc *sc = (struct ath_softc *) common->priv;
 142
 143         if (!(sc->sc_flags & SC_OP_ANI_RUN))
 144                 return;
 145
 146         if (sc->sc_flags & SC_OP_OFFCHANNEL)
 147                 return;
 148
 149         common->ani.longcal_timer = timestamp;
 150         common->ani.shortcal_timer = timestamp;
 151         common->ani.checkani_timer = timestamp;
 152
 153         mod_timer(&common->ani.timer,
 154                   jiffies +
 155                         msecs_to_jiffies((u32)ah->config.ani_poll_interval));
 156 }
 157
 158 static void ath_update_survey_nf(struct ath_softc *sc, int channel)
 159 {
 160         struct ath_hw *ah = sc->sc_ah;
 161         struct ath9k_channel *chan = &ah->channels[channel];
 162         struct survey_info *survey = &sc->survey[channel];
 163
 164         if (chan->noisefloor) {
 165                 survey->filled |= SURVEY_INFO_NOISE_DBM;
 166                 survey->noise = chan->noisefloor;
 167         }
 168 }
 169
 170 /*
 171  * Updates the survey statistics and returns the busy time since last
 172  * update in %, if the measurement duration was long enough for the
 173  * result to be useful, -1 otherwise.
 174  */
 175 static int ath_update_survey_stats(struct ath_softc *sc)
 176 {
 177         struct ath_hw *ah = sc->sc_ah;
 178         struct ath_common *common = ath9k_hw_common(ah);
 179         int pos = ah->curchan - &ah->channels[0];
 180         struct survey_info *survey = &sc->survey[pos];
 181         struct ath_cycle_counters *cc = &common->cc_survey;
 182         unsigned int div = common->clockrate * 1000;
 183         int ret = 0;
 184
 185         if (!ah->curchan)
 186                 return -1;
 187
 188         if (ah->power_mode == ATH9K_PM_AWAKE)
 189                 ath_hw_cycle_counters_update(common);
 190
 191         if (cc->cycles > 0) {
 192                 survey->filled |= SURVEY_INFO_CHANNEL_TIME |
 193                         SURVEY_INFO_CHANNEL_TIME_BUSY |
 194                         SURVEY_INFO_CHANNEL_TIME_RX |
 195                         SURVEY_INFO_CHANNEL_TIME_TX;
 196                 survey->channel_time += cc->cycles / div;
 197                 survey->channel_time_busy += cc->rx_busy / div;
 198                 survey->channel_time_rx += cc->rx_frame / div;
 199                 survey->channel_time_tx += cc->tx_frame / div;
 200         }
 201
 202         if (cc->cycles < div)
 203                 return -1;
 204
 205         if (cc->cycles > 0)
 206                 ret = cc->rx_busy * 100 / cc->cycles;
 207
 208         memset(cc, 0, sizeof(*cc));
 209
 210         ath_update_survey_nf(sc, pos);
 211
 212         return ret;
 213 }
 214
 215 /*
 216  * Set/change channels.  If the channel is really being changed, it's done
 217  * by reseting the chip.  To accomplish this we must first cleanup any pending
 218  * DMA, then restart stuff.
 219 */
 220 static int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw,
 221                     struct ath9k_channel *hchan)
 222 {
 223         struct ath_hw *ah = sc->sc_ah;
 224         struct ath_common *common = ath9k_hw_common(ah);
 225         struct ieee80211_conf *conf = &common->hw->conf;
 226         bool fastcc = true, stopped;
 227         struct ieee80211_channel *channel = hw->conf.channel;
 228         struct ath9k_hw_cal_data *caldata = NULL;
 229         int r;
 230
 231         if (sc->sc_flags & SC_OP_INVALID)
 232                 return -EIO;
 233
 234         sc->hw_busy_count = 0;
 235
 236         del_timer_sync(&common->ani.timer);
 237         cancel_work_sync(&sc->paprd_work);
 238         cancel_work_sync(&sc->hw_check_work);
 239         cancel_delayed_work_sync(&sc->tx_complete_work);
 240         cancel_delayed_work_sync(&sc->hw_pll_work);
 241
 242         ath9k_ps_wakeup(sc);
 243
 244         spin_lock_bh(&sc->sc_pcu_lock);
 245
 246         /*
 247          * This is only performed if the channel settings have
 248          * actually changed.
 249          *
 250          * To switch channels clear any pending DMA operations;
 251          * wait long enough for the RX fifo to drain, reset the
 252          * hardware at the new frequency, and then re-enable
 253          * the relevant bits of the h/w.
 254          */
 255         ath9k_hw_disable_interrupts(ah);
 256         stopped = ath_drain_all_txq(sc, false);
 257
 258         if (!ath_stoprecv(sc))
 259                 stopped = false;
 260
 261         if (!ath9k_hw_check_alive(ah))
 262                 stopped = false;
 263
 264         /* XXX: do not flush receive queue here. We don't want
 265          * to flush data frames already in queue because of
 266          * changing channel. */
 267
 268         if (!stopped || !(sc->sc_flags & SC_OP_OFFCHANNEL))
 269                 fastcc = false;
 270
 271         if (!(sc->sc_flags & SC_OP_OFFCHANNEL))
 272                 caldata = &sc->caldata;
 273
 274         ath_dbg(common, ATH_DBG_CONFIG,
 275                 "(%u MHz) -> (%u MHz), conf_is_ht40: %d fastcc: %d\n",
 276                 sc->sc_ah->curchan->channel,
 277                 channel->center_freq, conf_is_ht40(conf),
 278                 fastcc);
 279
 280         r = ath9k_hw_reset(ah, hchan, caldata, fastcc);
 281         if (r) {
 282                 ath_err(common,
 283                         "Unable to reset channel (%u MHz), reset status %d\n",
 284                         channel->center_freq, r);
 285                 goto ps_restore;
 286         }
 287
 288         if (ath_startrecv(sc) != 0) {
 289                 ath_err(common, "Unable to restart recv logic\n");
 290                 r = -EIO;
 291                 goto ps_restore;
 292         }
 293
 294         ath9k_cmn_update_txpow(ah, sc->curtxpow,
 295                                sc->config.txpowlimit, &sc->curtxpow);
 296         ath9k_hw_set_interrupts(ah, ah->imask);
 297
 298         if (!(sc->sc_flags & (SC_OP_OFFCHANNEL))) {
 299                 if (sc->sc_flags & SC_OP_BEACONS)
 300                         ath_set_beacon(sc);
 301                 ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work, 0);
 302                 ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work, HZ/2);
 303                 if (!common->disable_ani)
 304                         ath_start_ani(common);
 305         }
 306
 307  ps_restore:
 308         ieee80211_wake_queues(hw);
 309
 310         spin_unlock_bh(&sc->sc_pcu_lock);
 311
 312         ath9k_ps_restore(sc);
 313         return r;
 314 }
 315
 316 static void ath_paprd_activate(struct ath_softc *sc)
 317 {
 318         struct ath_hw *ah = sc->sc_ah;
 319         struct ath9k_hw_cal_data *caldata = ah->caldata;
 320         struct ath_common *common = ath9k_hw_common(ah);
 321         int chain;
 322
 323         if (!caldata || !caldata->paprd_done)
 324                 return;
 325
 326         ath9k_ps_wakeup(sc);
 327         ar9003_paprd_enable(ah, false);
 328         for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
 329                 if (!(common->tx_chainmask & BIT(chain)))
 330                         continue;
 331
 332                 ar9003_paprd_populate_single_table(ah, caldata, chain);
 333         }
 334
 335         ar9003_paprd_enable(ah, true);
 336         ath9k_ps_restore(sc);
 337 }
 338
 339 static bool ath_paprd_send_frame(struct ath_softc *sc, struct sk_buff *skb, int chain)
 340 {
 341         struct ieee80211_hw *hw = sc->hw;
 342         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 343         struct ath_hw *ah = sc->sc_ah;
 344         struct ath_common *common = ath9k_hw_common(ah);
 345         struct ath_tx_control txctl;
 346         int time_left;
 347
 348         memset(&txctl, 0, sizeof(txctl));
 349         txctl.txq = sc->tx.txq_map[WME_AC_BE];
 350
 351         memset(tx_info, 0, sizeof(*tx_info));
 352         tx_info->band = hw->conf.channel->band;
 353         tx_info->flags |= IEEE80211_TX_CTL_NO_ACK;
 354         tx_info->control.rates[0].idx = 0;
 355         tx_info->control.rates[0].count = 1;
 356         tx_info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
 357         tx_info->control.rates[1].idx = -1;
 358
 359         init_completion(&sc->paprd_complete);
 360         txctl.paprd = BIT(chain);
 361
 362         if (ath_tx_start(hw, skb, &txctl) != 0) {
 363                 ath_dbg(common, ATH_DBG_CALIBRATE, "PAPRD TX failed\n");
 364                 dev_kfree_skb_any(skb);
 365                 return false;
 366         }
 367
 368         time_left = wait_for_completion_timeout(&sc->paprd_complete,
 369                         msecs_to_jiffies(ATH_PAPRD_TIMEOUT));
 370
 371         if (!time_left)
 372                 ath_dbg(common, ATH_DBG_CALIBRATE,
 373                         "Timeout waiting for paprd training on TX chain %d\n",
 374                         chain);
 375
 376         return !!time_left;
 377 }
 378
 379 void ath_paprd_calibrate(struct work_struct *work)
 380 {
 381         struct ath_softc *sc = container_of(work, struct ath_softc, paprd_work);
 382         struct ieee80211_hw *hw = sc->hw;
 383         struct ath_hw *ah = sc->sc_ah;
 384         struct ieee80211_hdr *hdr;
 385         struct sk_buff *skb = NULL;
 386         struct ath9k_hw_cal_data *caldata = ah->caldata;
 387         struct ath_common *common = ath9k_hw_common(ah);
 388         int ftype;
 389         int chain_ok = 0;
 390         int chain;
 391         int len = 1800;
 392
 393         if (!caldata)
 394                 return;
 395
 396         ath9k_ps_wakeup(sc);
 397
 398         if (ar9003_paprd_init_table(ah) < 0)
 399                 goto fail_paprd;
 400
 401         skb = alloc_skb(len, GFP_KERNEL);
 402         if (!skb)
 403                 goto fail_paprd;
 404
 405         skb_put(skb, len);
 406         memset(skb->data, 0, len);
 407         hdr = (struct ieee80211_hdr *)skb->data;
 408         ftype = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC;
 409         hdr->frame_control = cpu_to_le16(ftype);
 410         hdr->duration_id = cpu_to_le16(10);
 411         memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN);
 412         memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
 413         memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);
 414
 415         for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
 416                 if (!(common->tx_chainmask & BIT(chain)))
 417                         continue;
 418
 419                 chain_ok = 0;
 420
 421                 ath_dbg(common, ATH_DBG_CALIBRATE,
 422                         "Sending PAPRD frame for thermal measurement "
 423                         "on chain %d\n", chain);
 424                 if (!ath_paprd_send_frame(sc, skb, chain))
 425                         goto fail_paprd;
 426
 427                 ar9003_paprd_setup_gain_table(ah, chain);
 428
 429                 ath_dbg(common, ATH_DBG_CALIBRATE,
 430                         "Sending PAPRD training frame on chain %d\n", chain);
 431                 if (!ath_paprd_send_frame(sc, skb, chain))
 432                         goto fail_paprd;
 433
 434                 if (!ar9003_paprd_is_done(ah)) {
 435                         ath_dbg(common, ATH_DBG_CALIBRATE,
 436                                 "PAPRD not yet done on chain %d\n", chain);
 437                         break;
 438                 }
 439
 440                 if (ar9003_paprd_create_curve(ah, caldata, chain)) {
 441                         ath_dbg(common, ATH_DBG_CALIBRATE,
 442                                 "PAPRD create curve failed on chain %d\n",
 443                                                                    chain);
 444                         break;
 445                 }
 446
 447                 chain_ok = 1;
 448         }
 449         kfree_skb(skb);
 450
 451         if (chain_ok) {
 452                 caldata->paprd_done = true;
 453                 ath_paprd_activate(sc);
 454         }
 455
 456 fail_paprd:
 457         ath9k_ps_restore(sc);
 458 }
 459
 460 /*
 461  *  This routine performs the periodic noise floor calibration function
 462  *  that is used to adjust and optimize the chip performance.  This
 463  *  takes environmental changes (location, temperature) into account.
 464  *  When the task is complete, it reschedules itself depending on the
 465  *  appropriate interval that was calculated.
 466  */
 467 void ath_ani_calibrate(unsigned long data)
 468 {
 469         struct ath_softc *sc = (struct ath_softc *)data;
 470         struct ath_hw *ah = sc->sc_ah;
 471         struct ath_common *common = ath9k_hw_common(ah);
 472         bool longcal = false;
 473         bool shortcal = false;
 474         bool aniflag = false;
 475         unsigned int timestamp = jiffies_to_msecs(jiffies);
 476         u32 cal_interval, short_cal_interval, long_cal_interval;
 477         unsigned long flags;
 478
 479         if (ah->caldata && ah->caldata->nfcal_interference)
 480                 long_cal_interval = ATH_LONG_CALINTERVAL_INT;
 481         else
 482                 long_cal_interval = ATH_LONG_CALINTERVAL;
 483
 484         short_cal_interval = (ah->opmode == NL80211_IFTYPE_AP) ?
 485                 ATH_AP_SHORT_CALINTERVAL : ATH_STA_SHORT_CALINTERVAL;
 486
 487         /* Only calibrate if awake */
 488         if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE)
 489                 goto set_timer;
 490
 491         ath9k_ps_wakeup(sc);
 492
 493         /* Long calibration runs independently of short calibration. */
 494         if ((timestamp - common->ani.longcal_timer) >= long_cal_interval) {
 495                 longcal = true;
 496                 ath_dbg(common, ATH_DBG_ANI, "longcal @%lu\n", jiffies);
 497                 common->ani.longcal_timer = timestamp;
 498         }
 499
 500         /* Short calibration applies only while caldone is false */
 501         if (!common->ani.caldone) {
 502                 if ((timestamp - common->ani.shortcal_timer) >= short_cal_interval) {
 503                         shortcal = true;
 504                         ath_dbg(common, ATH_DBG_ANI,
 505                                 "shortcal @%lu\n", jiffies);
 506                         common->ani.shortcal_timer = timestamp;
 507                         common->ani.resetcal_timer = timestamp;
 508                 }
 509         } else {
 510                 if ((timestamp - common->ani.resetcal_timer) >=
 511                     ATH_RESTART_CALINTERVAL) {
 512                         common->ani.caldone = ath9k_hw_reset_calvalid(ah);
 513                         if (common->ani.caldone)
 514                                 common->ani.resetcal_timer = timestamp;
 515                 }
 516         }
 517
 518         /* Verify whether we must check ANI */
 519         if ((timestamp - common->ani.checkani_timer) >=
 520              ah->config.ani_poll_interval) {
 521                 aniflag = true;
 522                 common->ani.checkani_timer = timestamp;
 523         }
 524
 525         /* Call ANI routine if necessary */
 526         if (aniflag) {
 527                 spin_lock_irqsave(&common->cc_lock, flags);
 528                 ath9k_hw_ani_monitor(ah, ah->curchan);
 529                 ath_update_survey_stats(sc);
 530                 spin_unlock_irqrestore(&common->cc_lock, flags);
 531         }
 532
 533         /* Perform calibration if necessary */
 534         if (longcal || shortcal) {
 535                 common->ani.caldone =
 536                         ath9k_hw_calibrate(ah, ah->curchan,
 537                                                 common->rx_chainmask, longcal);
 538         }
 539
 540         ath9k_ps_restore(sc);
 541
 542 set_timer:
 543         /*
 544         * Set timer interval based on previous results.
 545         * The interval must be the shortest necessary to satisfy ANI,
 546         * short calibration and long calibration.
 547         */
 548         cal_interval = ATH_LONG_CALINTERVAL;
 549         if (sc->sc_ah->config.enable_ani)
 550                 cal_interval = min(cal_interval,
 551                                    (u32)ah->config.ani_poll_interval);
 552         if (!common->ani.caldone)
 553                 cal_interval = min(cal_interval, (u32)short_cal_interval);
 554
 555         mod_timer(&common->ani.timer, jiffies + msecs_to_jiffies(cal_interval));
 556         if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_PAPRD) && ah->caldata) {
 557                 if (!ah->caldata->paprd_done)
 558                         ieee80211_queue_work(sc->hw, &sc->paprd_work);
 559                 else if (!ah->paprd_table_write_done)
 560                         ath_paprd_activate(sc);
 561         }
 562 }
 563
 564 static void ath_node_attach(struct ath_softc *sc, struct ieee80211_sta *sta)
 565 {
 566         struct ath_node *an;
 567         struct ath_hw *ah = sc->sc_ah;
 568         an = (struct ath_node *)sta->drv_priv;
 569
 570 #ifdef CONFIG_ATH9K_DEBUGFS
 571         spin_lock(&sc->nodes_lock);
 572         list_add(&an->list, &sc->nodes);
 573         spin_unlock(&sc->nodes_lock);
 574         an->sta = sta;
 575 #endif
 576         if ((ah->caps.hw_caps) & ATH9K_HW_CAP_APM)
 577                 sc->sc_flags |= SC_OP_ENABLE_APM;
 578
 579         if (sc->sc_flags & SC_OP_TXAGGR) {
 580                 ath_tx_node_init(sc, an);
 581                 an->maxampdu = 1 << (IEEE80211_HT_MAX_AMPDU_FACTOR +
 582                                      sta->ht_cap.ampdu_factor);
 583                 an->mpdudensity = parse_mpdudensity(sta->ht_cap.ampdu_density);
 584         }
 585 }
 586
 587 static void ath_node_detach(struct ath_softc *sc, struct ieee80211_sta *sta)
 588 {
 589         struct ath_node *an = (struct ath_node *)sta->drv_priv;
 590
 591 #ifdef CONFIG_ATH9K_DEBUGFS
 592         spin_lock(&sc->nodes_lock);
 593         list_del(&an->list);
 594         spin_unlock(&sc->nodes_lock);
 595         an->sta = NULL;
 596 #endif
 597
 598         if (sc->sc_flags & SC_OP_TXAGGR)
 599                 ath_tx_node_cleanup(sc, an);
 600 }
 601
 602 void ath_hw_check(struct work_struct *work)
 603 {
 604         struct ath_softc *sc = container_of(work, struct ath_softc, hw_check_work);
 605         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 606         unsigned long flags;
 607         int busy;
 608
 609         ath9k_ps_wakeup(sc);
 610         if (ath9k_hw_check_alive(sc->sc_ah))
 611                 goto out;
 612
 613         spin_lock_irqsave(&common->cc_lock, flags);
 614         busy = ath_update_survey_stats(sc);
 615         spin_unlock_irqrestore(&common->cc_lock, flags);
 616
 617         ath_dbg(common, ATH_DBG_RESET, "Possible baseband hang, "
 618                 "busy=%d (try %d)\n", busy, sc->hw_busy_count + 1);
 619         if (busy >= 99) {
 620                 if (++sc->hw_busy_count >= 3) {
 621                         spin_lock_bh(&sc->sc_pcu_lock);
 622                         ath_reset(sc, true);
 623                         spin_unlock_bh(&sc->sc_pcu_lock);
 624                 }
 625         } else if (busy >= 0)
 626                 sc->hw_busy_count = 0;
 627
 628 out:
 629         ath9k_ps_restore(sc);
 630 }
 631
 632 static void ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum)
 633 {
 634         static int count;
 635         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 636
 637         if (pll_sqsum >= 0x40000) {
 638                 count++;
 639                 if (count == 3) {
 640                         /* Rx is hung for more than 500ms. Reset it */
 641                         ath_dbg(common, ATH_DBG_RESET,
 642                                 "Possible RX hang, resetting");
 643                         spin_lock_bh(&sc->sc_pcu_lock);
 644                         ath_reset(sc, true);
 645                         spin_unlock_bh(&sc->sc_pcu_lock);
 646                         count = 0;
 647                 }
 648         } else
 649                 count = 0;
 650 }
 651
 652 void ath_hw_pll_work(struct work_struct *work)
 653 {
 654         struct ath_softc *sc = container_of(work, struct ath_softc,
 655                                             hw_pll_work.work);
 656         u32 pll_sqsum;
 657
 658         if (AR_SREV_9485(sc->sc_ah)) {
 659
 660                 ath9k_ps_wakeup(sc);
 661                 pll_sqsum = ar9003_get_pll_sqsum_dvc(sc->sc_ah);
 662                 ath9k_ps_restore(sc);
 663
 664                 ath_hw_pll_rx_hang_check(sc, pll_sqsum);
 665
 666                 ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work, HZ/5);
 667         }
 668 }
 669
 670
 671 void ath9k_tasklet(unsigned long data)
 672 {
 673         struct ath_softc *sc = (struct ath_softc *)data;
 674         struct ath_hw *ah = sc->sc_ah;
 675         struct ath_common *common = ath9k_hw_common(ah);
 676
 677         u32 status = sc->intrstatus;
 678         u32 rxmask;
 679
 680         if ((status & ATH9K_INT_FATAL) ||
 681             (status & ATH9K_INT_BB_WATCHDOG)) {
 682                 spin_lock(&sc->sc_pcu_lock);
 683                 ath_reset(sc, true);
 684                 spin_unlock(&sc->sc_pcu_lock);
 685                 return;
 686         }
 687
 688         ath9k_ps_wakeup(sc);
 689         spin_lock(&sc->sc_pcu_lock);
 690
 691         /*
 692          * Only run the baseband hang check if beacons stop working in AP or
 693          * IBSS mode, because it has a high false positive rate. For station
 694          * mode it should not be necessary, since the upper layers will detect
 695          * this through a beacon miss automatically and the following channel
 696          * change will trigger a hardware reset anyway
 697          */
 698         if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0 &&
 699             !ath9k_hw_check_alive(ah))
 700                 ieee80211_queue_work(sc->hw, &sc->hw_check_work);
 701
 702         if ((status & ATH9K_INT_TSFOOR) && sc->ps_enabled) {
 703                 /*
 704                  * TSF sync does not look correct; remain awake to sync with
 705                  * the next Beacon.
 706                  */
 707                 ath_dbg(common, ATH_DBG_PS,
 708                         "TSFOOR - Sync with next Beacon\n");
 709                 sc->ps_flags |= PS_WAIT_FOR_BEACON | PS_BEACON_SYNC |
 710                                 PS_TSFOOR_SYNC;
 711         }
 712
 713         if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
 714                 rxmask = (ATH9K_INT_RXHP | ATH9K_INT_RXLP | ATH9K_INT_RXEOL |
 715                           ATH9K_INT_RXORN);
 716         else
 717                 rxmask = (ATH9K_INT_RX | ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
 718
 719         if (status & rxmask) {
 720                 /* Check for high priority Rx first */
 721                 if ((ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) &&
 722                     (status & ATH9K_INT_RXHP))
 723                         ath_rx_tasklet(sc, 0, true);
 724
 725                 ath_rx_tasklet(sc, 0, false);
 726         }
 727
 728         if (status & ATH9K_INT_TX) {
 729                 if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
 730                         ath_tx_edma_tasklet(sc);
 731                 else
 732                         ath_tx_tasklet(sc);
 733         }
 734
 735         if (ah->btcoex_hw.scheme == ATH_BTCOEX_CFG_3WIRE)
 736                 if (status & ATH9K_INT_GENTIMER)
 737                         ath_gen_timer_isr(sc->sc_ah);
 738
 739         /* re-enable hardware interrupt */
 740         ath9k_hw_enable_interrupts(ah);
 741
 742         spin_unlock(&sc->sc_pcu_lock);
 743         ath9k_ps_restore(sc);
 744 }
 745
 746 irqreturn_t ath_isr(int irq, void *dev)
 747 {
 748 #define SCHED_INTR (                            \
 749                 ATH9K_INT_FATAL |               \
 750                 ATH9K_INT_BB_WATCHDOG |         \
 751                 ATH9K_INT_RXORN |               \
 752                 ATH9K_INT_RXEOL |               \
 753                 ATH9K_INT_RX |                  \
 754                 ATH9K_INT_RXLP |                \
 755                 ATH9K_INT_RXHP |                \
 756                 ATH9K_INT_TX |                  \
 757                 ATH9K_INT_BMISS |               \
 758                 ATH9K_INT_CST |                 \
 759                 ATH9K_INT_TSFOOR |              \
 760                 ATH9K_INT_GENTIMER)
 761
 762         struct ath_softc *sc = dev;
 763         struct ath_hw *ah = sc->sc_ah;
 764         struct ath_common *common = ath9k_hw_common(ah);
 765         enum ath9k_int status;
 766         bool sched = false;
 767
 768         /*
 769          * The hardware is not ready/present, don't
 770          * touch anything. Note this can happen early
 771          * on if the IRQ is shared.
 772          */
 773         if (sc->sc_flags & SC_OP_INVALID)
 774                 return IRQ_NONE;
 775
 776
 777         /* shared irq, not for us */
 778
 779         if (!ath9k_hw_intrpend(ah))
 780                 return IRQ_NONE;
 781
 782         /*
 783          * Figure out the reason(s) for the interrupt.  Note
 784          * that the hal returns a pseudo-ISR that may include
 785          * bits we haven't explicitly enabled so we mask the
 786          * value to insure we only process bits we requested.
 787          */
 788         ath9k_hw_getisr(ah, &status);   /* NB: clears ISR too */
 789         status &= ah->imask;    /* discard unasked-for bits */
 790
 791         /*
 792          * If there are no status bits set, then this interrupt was not
 793          * for me (should have been caught above).
 794          */
 795         if (!status)
 796                 return IRQ_NONE;
 797
 798         /* Cache the status */
 799         sc->intrstatus = status;
 800
 801         if (status & SCHED_INTR)
 802                 sched = true;
 803
 804         /*
 805          * If a FATAL or RXORN interrupt is received, we have to reset the
 806          * chip immediately.
 807          */
 808         if ((status & ATH9K_INT_FATAL) || ((status & ATH9K_INT_RXORN) &&
 809             !(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)))
 810                 goto chip_reset;
 811
 812         if ((ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) &&
 813             (status & ATH9K_INT_BB_WATCHDOG)) {
 814
 815                 spin_lock(&common->cc_lock);
 816                 ath_hw_cycle_counters_update(common);
 817                 ar9003_hw_bb_watchdog_dbg_info(ah);
 818                 spin_unlock(&common->cc_lock);
 819
 820                 goto chip_reset;
 821         }
 822
 823         if (status & ATH9K_INT_SWBA)
 824                 tasklet_schedule(&sc->bcon_tasklet);
 825
 826         if (status & ATH9K_INT_TXURN)
 827                 ath9k_hw_updatetxtriglevel(ah, true);
 828
 829         if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
 830                 if (status & ATH9K_INT_RXEOL) {
 831                         ah->imask &= ~(ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
 832                         ath9k_hw_set_interrupts(ah, ah->imask);
 833                 }
 834         }
 835
 836         if (status & ATH9K_INT_MIB) {
 837                 /*
 838                  * Disable interrupts until we service the MIB
 839                  * interrupt; otherwise it will continue to
 840                  * fire.
 841                  */
 842                 ath9k_hw_disable_interrupts(ah);
 843                 /*
 844                  * Let the hal handle the event. We assume
 845                  * it will clear whatever condition caused
 846                  * the interrupt.
 847                  */
 848                 spin_lock(&common->cc_lock);
 849                 ath9k_hw_proc_mib_event(ah);
 850                 spin_unlock(&common->cc_lock);
 851                 ath9k_hw_enable_interrupts(ah);
 852         }
 853
 854         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP))
 855                 if (status & ATH9K_INT_TIM_TIMER) {
 856                         if (ATH_DBG_WARN_ON_ONCE(sc->ps_idle))
 857                                 goto chip_reset;
 858                         /* Clear RxAbort bit so that we can
 859                          * receive frames */
 860                         ath9k_setpower(sc, ATH9K_PM_AWAKE);
 861                         ath9k_hw_setrxabort(sc->sc_ah, 0);
 862                         sc->ps_flags |= PS_WAIT_FOR_BEACON;
 863                 }
 864
 865 chip_reset:
 866
 867         ath_debug_stat_interrupt(sc, status);
 868
 869         if (sched) {
 870                 /* turn off every interrupt */
 871                 ath9k_hw_disable_interrupts(ah);
 872                 tasklet_schedule(&sc->intr_tq);
 873         }
 874
 875         return IRQ_HANDLED;
 876
 877 #undef SCHED_INTR
 878 }
 879
 880 static void ath_radio_enable(struct ath_softc *sc, struct ieee80211_hw *hw)
 881 {
 882         struct ath_hw *ah = sc->sc_ah;
 883         struct ath_common *common = ath9k_hw_common(ah);
 884         struct ieee80211_channel *channel = hw->conf.channel;
 885         int r;
 886
 887         ath9k_ps_wakeup(sc);
 888         spin_lock_bh(&sc->sc_pcu_lock);
 889
 890         ath9k_hw_configpcipowersave(ah, 0, 0);
 891
 892         if (!ah->curchan)
 893                 ah->curchan = ath9k_cmn_get_curchannel(sc->hw, ah);
 894
 895         r = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
 896         if (r) {
 897                 ath_err(common,
 898                         "Unable to reset channel (%u MHz), reset status %d\n",
 899                         channel->center_freq, r);
 900         }
 901
 902         ath9k_cmn_update_txpow(ah, sc->curtxpow,
 903                                sc->config.txpowlimit, &sc->curtxpow);
 904         if (ath_startrecv(sc) != 0) {
 905                 ath_err(common, "Unable to restart recv logic\n");
 906                 goto out;
 907         }
 908         if (sc->sc_flags & SC_OP_BEACONS)
 909                 ath_set_beacon(sc);     /* restart beacons */
 910
 911         /* Re-Enable  interrupts */
 912         ath9k_hw_set_interrupts(ah, ah->imask);
 913
 914         /* Enable LED */
 915         ath9k_hw_cfg_output(ah, ah->led_pin,
 916                             AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 917         ath9k_hw_set_gpio(ah, ah->led_pin, 0);
 918
 919         ieee80211_wake_queues(hw);
 920         ieee80211_queue_delayed_work(hw, &sc->hw_pll_work, HZ/2);
 921
 922 out:
 923         spin_unlock_bh(&sc->sc_pcu_lock);
 924
 925         ath9k_ps_restore(sc);
 926 }
 927
 928 void ath_radio_disable(struct ath_softc *sc, struct ieee80211_hw *hw)
 929 {
 930         struct ath_hw *ah = sc->sc_ah;
 931         struct ieee80211_channel *channel = hw->conf.channel;
 932         int r;
 933
 934         ath9k_ps_wakeup(sc);
 935         cancel_delayed_work_sync(&sc->hw_pll_work);
 936
 937         spin_lock_bh(&sc->sc_pcu_lock);
 938
 939         ieee80211_stop_queues(hw);
 940
 941         /*
 942          * Keep the LED on when the radio is disabled
 943          * during idle unassociated state.
 944          */
 945         if (!sc->ps_idle) {
 946                 ath9k_hw_set_gpio(ah, ah->led_pin, 1);
 947                 ath9k_hw_cfg_gpio_input(ah, ah->led_pin);
 948         }
 949
 950         /* Disable interrupts */
 951         ath9k_hw_disable_interrupts(ah);
 952
 953         ath_drain_all_txq(sc, false);   /* clear pending tx frames */
 954
 955         ath_stoprecv(sc);               /* turn off frame recv */
 956         ath_flushrecv(sc);              /* flush recv queue */
 957
 958         if (!ah->curchan)
 959                 ah->curchan = ath9k_cmn_get_curchannel(hw, ah);
 960
 961         r = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
 962         if (r) {
 963                 ath_err(ath9k_hw_common(sc->sc_ah),
 964                         "Unable to reset channel (%u MHz), reset status %d\n",
 965                         channel->center_freq, r);
 966         }
 967
 968         ath9k_hw_phy_disable(ah);
 969
 970         ath9k_hw_configpcipowersave(ah, 1, 1);
 971
 972         spin_unlock_bh(&sc->sc_pcu_lock);
 973         ath9k_ps_restore(sc);
 974 }
 975
 976 int ath_reset(struct ath_softc *sc, bool retry_tx)
 977 {
 978         struct ath_hw *ah = sc->sc_ah;
 979         struct ath_common *common = ath9k_hw_common(ah);
 980         struct ieee80211_hw *hw = sc->hw;
 981         int r;
 982
 983         sc->hw_busy_count = 0;
 984
 985         /* Stop ANI */
 986
 987         del_timer_sync(&common->ani.timer);
 988
 989         ath9k_ps_wakeup(sc);
 990
 991         ieee80211_stop_queues(hw);
 992
 993         ath9k_hw_disable_interrupts(ah);
 994         ath_drain_all_txq(sc, retry_tx);
 995
 996         ath_stoprecv(sc);
 997         ath_flushrecv(sc);
 998
 999         r = ath9k_hw_reset(ah, sc->sc_ah->curchan, ah->caldata, false);
1000         if (r)
1001                 ath_err(common,
1002                         "Unable to reset hardware; reset status %d\n", r);
1003
1004         if (ath_startrecv(sc) != 0)
1005                 ath_err(common, "Unable to start recv logic\n");
1006
1007         /*
1008          * We may be doing a reset in response to a request
1009          * that changes the channel so update any state that
1010          * might change as a result.
1011          */
1012         ath9k_cmn_update_txpow(ah, sc->curtxpow,
1013                                sc->config.txpowlimit, &sc->curtxpow);
1014
1015         if ((sc->sc_flags & SC_OP_BEACONS) || !(sc->sc_flags & (SC_OP_OFFCHANNEL)))
1016                 ath_set_beacon(sc);     /* restart beacons */
1017
1018         ath9k_hw_set_interrupts(ah, ah->imask);
1019
1020         if (retry_tx) {
1021                 int i;
1022                 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
1023                         if (ATH_TXQ_SETUP(sc, i)) {
1024                                 spin_lock_bh(&sc->tx.txq[i].axq_lock);
1025                                 ath_txq_schedule(sc, &sc->tx.txq[i]);
1026                                 spin_unlock_bh(&sc->tx.txq[i].axq_lock);
1027                         }
1028                 }
1029         }
1030
1031         ieee80211_wake_queues(hw);
1032
1033         /* Start ANI */
1034         if (!common->disable_ani)
1035                 ath_start_ani(common);
1036
1037         ath9k_ps_restore(sc);
1038
1039         return r;
1040 }
1041
1042 /**********************/
1043 /* mac80211 callbacks */
1044 /**********************/
1045
1046 static int ath9k_start(struct ieee80211_hw *hw)
1047 {
1048         struct ath_softc *sc = hw->priv;
1049         struct ath_hw *ah = sc->sc_ah;
1050         struct ath_common *common = ath9k_hw_common(ah);
1051         struct ieee80211_channel *curchan = hw->conf.channel;
1052         struct ath9k_channel *init_channel;
1053         int r;
1054
1055         ath_dbg(common, ATH_DBG_CONFIG,
1056                 "Starting driver with initial channel: %d MHz\n",
1057                 curchan->center_freq);
1058
1059         ath9k_ps_wakeup(sc);
1060
1061         mutex_lock(&sc->mutex);
1062
1063         /* setup initial channel */
1064         sc->chan_idx = curchan->hw_value;
1065
1066         init_channel = ath9k_cmn_get_curchannel(hw, ah);
1067
1068         /* Reset SERDES registers */
1069         ath9k_hw_configpcipowersave(ah, 0, 0);
1070
1071         /*
1072          * The basic interface to setting the hardware in a good
1073          * state is ``reset''.  On return the hardware is known to
1074          * be powered up and with interrupts disabled.  This must
1075          * be followed by initialization of the appropriate bits
1076          * and then setup of the interrupt mask.
1077          */
1078         spin_lock_bh(&sc->sc_pcu_lock);
1079         r = ath9k_hw_reset(ah, init_channel, ah->caldata, false);
1080         if (r) {
1081                 ath_err(common,
1082                         "Unable to reset hardware; reset status %d (freq %u MHz)\n",
1083                         r, curchan->center_freq);
1084                 spin_unlock_bh(&sc->sc_pcu_lock);
1085                 goto mutex_unlock;
1086         }
1087
1088         /*
1089          * This is needed only to setup initial state
1090          * but it's best done after a reset.
1091          */
1092         ath9k_cmn_update_txpow(ah, sc->curtxpow,
1093                         sc->config.txpowlimit, &sc->curtxpow);
1094
1095         /*
1096          * Setup the hardware after reset:
1097          * The receive engine is set going.
1098          * Frame transmit is handled entirely
1099          * in the frame output path; there's nothing to do
1100          * here except setup the interrupt mask.
1101          */
1102         if (ath_startrecv(sc) != 0) {
1103                 ath_err(common, "Unable to start recv logic\n");
1104                 r = -EIO;
1105                 spin_unlock_bh(&sc->sc_pcu_lock);
1106                 goto mutex_unlock;
1107         }
1108         spin_unlock_bh(&sc->sc_pcu_lock);
1109
1110         /* Setup our intr mask. */
1111         ah->imask = ATH9K_INT_TX | ATH9K_INT_RXEOL |
1112                     ATH9K_INT_RXORN | ATH9K_INT_FATAL |
1113                     ATH9K_INT_GLOBAL;
1114
1115         if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
1116                 ah->imask |= ATH9K_INT_RXHP |
1117                              ATH9K_INT_RXLP |
1118                              ATH9K_INT_BB_WATCHDOG;
1119         else
1120                 ah->imask |= ATH9K_INT_RX;
1121
1122         ah->imask |= ATH9K_INT_GTT;
1123
1124         if (ah->caps.hw_caps & ATH9K_HW_CAP_HT)
1125                 ah->imask |= ATH9K_INT_CST;
1126
1127         sc->sc_flags &= ~SC_OP_INVALID;
1128         sc->sc_ah->is_monitoring = false;
1129
1130         /* Disable BMISS interrupt when we're not associated */
1131         ah->imask &= ~(ATH9K_INT_SWBA | ATH9K_INT_BMISS);
1132         ath9k_hw_set_interrupts(ah, ah->imask);
1133
1134         ieee80211_wake_queues(hw);
1135
1136         ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work, 0);
1137
1138         if ((ah->btcoex_hw.scheme != ATH_BTCOEX_CFG_NONE) &&
1139             !ah->btcoex_hw.enabled) {
1140                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
1141                                            AR_STOMP_LOW_WLAN_WGHT);
1142                 ath9k_hw_btcoex_enable(ah);
1143
1144                 if (common->bus_ops->bt_coex_prep)
1145                         common->bus_ops->bt_coex_prep(common);
1146                 if (ah->btcoex_hw.scheme == ATH_BTCOEX_CFG_3WIRE)
1147                         ath9k_btcoex_timer_resume(sc);
1148         }
1149
1150         if (ah->caps.pcie_lcr_extsync_en && common->bus_ops->extn_synch_en)
1151                 common->bus_ops->extn_synch_en(common);
1152
1153 mutex_unlock:
1154         mutex_unlock(&sc->mutex);
1155
1156         ath9k_ps_restore(sc);
1157
1158         return r;
1159 }
1160
1161 static void ath9k_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
1162 {
1163         struct ath_softc *sc = hw->priv;
1164         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1165         struct ath_tx_control txctl;
1166         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1167
1168         if (sc->ps_enabled) {
1169                 /*
1170                  * mac80211 does not set PM field for normal data frames, so we
1171                  * need to update that based on the current PS mode.
1172                  */
1173                 if (ieee80211_is_data(hdr->frame_control) &&
1174                     !ieee80211_is_nullfunc(hdr->frame_control) &&
1175                     !ieee80211_has_pm(hdr->frame_control)) {
1176                         ath_dbg(common, ATH_DBG_PS,
1177                                 "Add PM=1 for a TX frame while in PS mode\n");
1178                         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
1179                 }
1180         }
1181
1182         if (unlikely(sc->sc_ah->power_mode != ATH9K_PM_AWAKE)) {
1183                 /*
1184                  * We are using PS-Poll and mac80211 can request TX while in
1185                  * power save mode. Need to wake up hardware for the TX to be
1186                  * completed and if needed, also for RX of buffered frames.
1187                  */
1188                 ath9k_ps_wakeup(sc);
1189                 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP))
1190                         ath9k_hw_setrxabort(sc->sc_ah, 0);
1191                 if (ieee80211_is_pspoll(hdr->frame_control)) {
1192                         ath_dbg(common, ATH_DBG_PS,
1193                                 "Sending PS-Poll to pick a buffered frame\n");
1194                         sc->ps_flags |= PS_WAIT_FOR_PSPOLL_DATA;
1195                 } else {
1196                         ath_dbg(common, ATH_DBG_PS,
1197                                 "Wake up to complete TX\n");
1198                         sc->ps_flags |= PS_WAIT_FOR_TX_ACK;
1199                 }
1200                 /*
1201                  * The actual restore operation will happen only after
1202                  * the sc_flags bit is cleared. We are just dropping
1203                  * the ps_usecount here.
1204                  */
1205                 ath9k_ps_restore(sc);
1206         }
1207
1208         memset(&txctl, 0, sizeof(struct ath_tx_control));
1209         txctl.txq = sc->tx.txq_map[skb_get_queue_mapping(skb)];
1210
1211         ath_dbg(common, ATH_DBG_XMIT, "transmitting packet, skb: %p\n", skb);
1212
1213         if (ath_tx_start(hw, skb, &txctl) != 0) {
1214                 ath_dbg(common, ATH_DBG_XMIT, "TX failed\n");
1215                 goto exit;
1216         }
1217
1218         return;
1219 exit:
1220         dev_kfree_skb_any(skb);
1221 }
1222
1223 static void ath9k_stop(struct ieee80211_hw *hw)
1224 {
1225         struct ath_softc *sc = hw->priv;
1226         struct ath_hw *ah = sc->sc_ah;
1227         struct ath_common *common = ath9k_hw_common(ah);
1228
1229         mutex_lock(&sc->mutex);
1230
1231         cancel_delayed_work_sync(&sc->tx_complete_work);
1232         cancel_delayed_work_sync(&sc->hw_pll_work);
1233         cancel_work_sync(&sc->paprd_work);
1234         cancel_work_sync(&sc->hw_check_work);
1235
1236         if (sc->sc_flags & SC_OP_INVALID) {
1237                 ath_dbg(common, ATH_DBG_ANY, "Device not present\n");
1238                 mutex_unlock(&sc->mutex);
1239                 return;
1240         }
1241
1242         /* Ensure HW is awake when we try to shut it down. */
1243         ath9k_ps_wakeup(sc);
1244
1245         if (ah->btcoex_hw.enabled) {
1246                 ath9k_hw_btcoex_disable(ah);
1247                 if (ah->btcoex_hw.scheme == ATH_BTCOEX_CFG_3WIRE)
1248                         ath9k_btcoex_timer_pause(sc);
1249         }
1250
1251         spin_lock_bh(&sc->sc_pcu_lock);
1252
1253         /* prevent tasklets to enable interrupts once we disable them */
1254         ah->imask &= ~ATH9K_INT_GLOBAL;
1255
1256         /* make sure h/w will not generate any interrupt
1257          * before setting the invalid flag. */
1258         ath9k_hw_disable_interrupts(ah);
1259
1260         if (!(sc->sc_flags & SC_OP_INVALID)) {
1261                 ath_drain_all_txq(sc, false);
1262                 ath_stoprecv(sc);
1263                 ath9k_hw_phy_disable(ah);
1264         } else
1265                 sc->rx.rxlink = NULL;
1266
1267         if (sc->rx.frag) {
1268                 dev_kfree_skb_any(sc->rx.frag);
1269                 sc->rx.frag = NULL;
1270         }
1271
1272         /* disable HAL and put h/w to sleep */
1273         ath9k_hw_disable(ah);
1274
1275         spin_unlock_bh(&sc->sc_pcu_lock);
1276
1277         /* we can now sync irq and kill any running tasklets, since we already
1278          * disabled interrupts and not holding a spin lock */
1279         synchronize_irq(sc->irq);
1280         tasklet_kill(&sc->intr_tq);
1281         tasklet_kill(&sc->bcon_tasklet);
1282
1283         ath9k_ps_restore(sc);
1284
1285         sc->ps_idle = true;
1286         ath_radio_disable(sc, hw);
1287
1288         sc->sc_flags |= SC_OP_INVALID;
1289
1290         mutex_unlock(&sc->mutex);
1291
1292         ath_dbg(common, ATH_DBG_CONFIG, "Driver halt\n");
1293 }
1294
1295 bool ath9k_uses_beacons(int type)
1296 {
1297         switch (type) {
1298         case NL80211_IFTYPE_AP:
1299         case NL80211_IFTYPE_ADHOC:
1300         case NL80211_IFTYPE_MESH_POINT:
1301                 return true;
1302         default:
1303                 return false;
1304         }
1305 }
1306
1307 static void ath9k_reclaim_beacon(struct ath_softc *sc,
1308                                  struct ieee80211_vif *vif)
1309 {
1310         struct ath_vif *avp = (void *)vif->drv_priv;
1311
1312         ath9k_set_beaconing_status(sc, false);
1313         ath_beacon_return(sc, avp);
1314         ath9k_set_beaconing_status(sc, true);
1315         sc->sc_flags &= ~SC_OP_BEACONS;
1316 }
1317
1318 static void ath9k_vif_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
1319 {
1320         struct ath9k_vif_iter_data *iter_data = data;
1321         int i;
1322
1323         if (iter_data->hw_macaddr)
1324                 for (i = 0; i < ETH_ALEN; i++)
1325                         iter_data->mask[i] &=
1326                                 ~(iter_data->hw_macaddr[i] ^ mac[i]);
1327
1328         switch (vif->type) {
1329         case NL80211_IFTYPE_AP:
1330                 iter_data->naps++;
1331                 break;
1332         case NL80211_IFTYPE_STATION:
1333                 iter_data->nstations++;
1334                 break;
1335         case NL80211_IFTYPE_ADHOC:
1336                 iter_data->nadhocs++;
1337                 break;
1338         case NL80211_IFTYPE_MESH_POINT:
1339                 iter_data->nmeshes++;
1340                 break;
1341         case NL80211_IFTYPE_WDS:
1342                 iter_data->nwds++;
1343                 break;
1344         default:
1345                 iter_data->nothers++;
1346                 break;
1347         }
1348 }
1349
1350 /* Called with sc->mutex held. */
1351 void ath9k_calculate_iter_data(struct ieee80211_hw *hw,
1352                                struct ieee80211_vif *vif,
1353                                struct ath9k_vif_iter_data *iter_data)
1354 {
1355         struct ath_softc *sc = hw->priv;
1356         struct ath_hw *ah = sc->sc_ah;
1357         struct ath_common *common = ath9k_hw_common(ah);
1358
1359         /*
1360          * Use the hardware MAC address as reference, the hardware uses it
1361          * together with the BSSID mask when matching addresses.
1362          */
1363         memset(iter_data, 0, sizeof(*iter_data));
1364         iter_data->hw_macaddr = common->macaddr;
1365         memset(&iter_data->mask, 0xff, ETH_ALEN);
1366
1367         if (vif)
1368                 ath9k_vif_iter(iter_data, vif->addr, vif);
1369
1370         /* Get list of all active MAC addresses */
1371         ieee80211_iterate_active_interfaces_atomic(sc->hw, ath9k_vif_iter,
1372                                                    iter_data);
1373 }
1374
1375 /* Called with sc->mutex held. */
1376 static void ath9k_calculate_summary_state(struct ieee80211_hw *hw,
1377                                           struct ieee80211_vif *vif)
1378 {
1379         struct ath_softc *sc = hw->priv;
1380         struct ath_hw *ah = sc->sc_ah;
1381         struct ath_common *common = ath9k_hw_common(ah);
1382         struct ath9k_vif_iter_data iter_data;
1383
1384         ath9k_calculate_iter_data(hw, vif, &iter_data);
1385
1386         /* Set BSSID mask. */
1387         memcpy(common->bssidmask, iter_data.mask, ETH_ALEN);
1388         ath_hw_setbssidmask(common);
1389
1390         /* Set op-mode & TSF */
1391         if (iter_data.naps > 0) {
1392                 ath9k_hw_set_tsfadjust(ah, 1);
1393                 sc->sc_flags |= SC_OP_TSF_RESET;
1394                 ah->opmode = NL80211_IFTYPE_AP;
1395         } else {
1396                 ath9k_hw_set_tsfadjust(ah, 0);
1397                 sc->sc_flags &= ~SC_OP_TSF_RESET;
1398
1399                 if (iter_data.nmeshes)
1400                         ah->opmode = NL80211_IFTYPE_MESH_POINT;
1401                 else if (iter_data.nwds)
1402                         ah->opmode = NL80211_IFTYPE_AP;
1403                 else if (iter_data.nadhocs)
1404                         ah->opmode = NL80211_IFTYPE_ADHOC;
1405                 else
1406                         ah->opmode = NL80211_IFTYPE_STATION;
1407         }
1408
1409         /*
1410          * Enable MIB interrupts when there are hardware phy counters.
1411          */
1412         if ((iter_data.nstations + iter_data.nadhocs + iter_data.nmeshes) > 0) {
1413                 if (ah->config.enable_ani)
1414                         ah->imask |= ATH9K_INT_MIB;
1415                 ah->imask |= ATH9K_INT_TSFOOR;
1416         } else {
1417                 ah->imask &= ~ATH9K_INT_MIB;
1418                 ah->imask &= ~ATH9K_INT_TSFOOR;
1419         }
1420
1421         ath9k_hw_set_interrupts(ah, ah->imask);
1422
1423         /* Set up ANI */
1424         if (iter_data.naps > 0) {
1425                 sc->sc_ah->stats.avgbrssi = ATH_RSSI_DUMMY_MARKER;
1426
1427                 if (!common->disable_ani) {
1428                         sc->sc_flags |= SC_OP_ANI_RUN;
1429                         ath_start_ani(common);
1430                 }
1431
1432         } else {
1433                 sc->sc_flags &= ~SC_OP_ANI_RUN;
1434                 del_timer_sync(&common->ani.timer);
1435         }
1436 }
1437
1438 /* Called with sc->mutex held, vif counts set up properly. */
1439 static void ath9k_do_vif_add_setup(struct ieee80211_hw *hw,
1440                                    struct ieee80211_vif *vif)
1441 {
1442         struct ath_softc *sc = hw->priv;
1443
1444         ath9k_calculate_summary_state(hw, vif);
1445
1446         if (ath9k_uses_beacons(vif->type)) {
1447                 int error;
1448                 /* This may fail because upper levels do not have beacons
1449                  * properly configured yet.  That's OK, we assume it
1450                  * will be properly configured and then we will be notified
1451                  * in the info_changed method and set up beacons properly
1452                  * there.
1453                  */
1454                 ath9k_set_beaconing_status(sc, false);
1455                 error = ath_beacon_alloc(sc, vif);
1456                 if (!error)
1457                         ath_beacon_config(sc, vif);
1458                 ath9k_set_beaconing_status(sc, true);
1459         }
1460 }
1461
1462
1463 static int ath9k_add_interface(struct ieee80211_hw *hw,
1464                                struct ieee80211_vif *vif)
1465 {
1466         struct ath_softc *sc = hw->priv;
1467         struct ath_hw *ah = sc->sc_ah;
1468         struct ath_common *common = ath9k_hw_common(ah);
1469         int ret = 0;
1470
1471         ath9k_ps_wakeup(sc);
1472         mutex_lock(&sc->mutex);
1473
1474         switch (vif->type) {
1475         case NL80211_IFTYPE_STATION:
1476         case NL80211_IFTYPE_WDS:
1477         case NL80211_IFTYPE_ADHOC:
1478         case NL80211_IFTYPE_AP:
1479         case NL80211_IFTYPE_MESH_POINT:
1480                 break;
1481         default:
1482                 ath_err(common, "Interface type %d not yet supported\n",
1483                         vif->type);
1484                 ret = -EOPNOTSUPP;
1485                 goto out;
1486         }
1487
1488         if (ath9k_uses_beacons(vif->type)) {
1489                 if (sc->nbcnvifs >= ATH_BCBUF) {
1490                         ath_err(common, "Not enough beacon buffers when adding"
1491                                 " new interface of type: %i\n",
1492                                 vif->type);
1493                         ret = -ENOBUFS;
1494                         goto out;
1495                 }
1496         }
1497
1498         if ((ah->opmode == NL80211_IFTYPE_ADHOC) ||
1499             ((vif->type == NL80211_IFTYPE_ADHOC) &&
1500              sc->nvifs > 0)) {
1501                 ath_err(common, "Cannot create ADHOC interface when other"
1502                         " interfaces already exist.\n");
1503                 ret = -EINVAL;
1504                 goto out;
1505         }
1506
1507         ath_dbg(common, ATH_DBG_CONFIG,
1508                 "Attach a VIF of type: %d\n", vif->type);
1509
1510         sc->nvifs++;
1511
1512         ath9k_do_vif_add_setup(hw, vif);
1513 out:
1514         mutex_unlock(&sc->mutex);
1515         ath9k_ps_restore(sc);
1516         return ret;
1517 }
1518
1519 static int ath9k_change_interface(struct ieee80211_hw *hw,
1520                                   struct ieee80211_vif *vif,
1521                                   enum nl80211_iftype new_type,
1522                                   bool p2p)
1523 {
1524         struct ath_softc *sc = hw->priv;
1525         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1526         int ret = 0;
1527
1528         ath_dbg(common, ATH_DBG_CONFIG, "Change Interface\n");
1529         mutex_lock(&sc->mutex);
1530         ath9k_ps_wakeup(sc);
1531
1532         /* See if new interface type is valid. */
1533         if ((new_type == NL80211_IFTYPE_ADHOC) &&
1534             (sc->nvifs > 1)) {
1535                 ath_err(common, "When using ADHOC, it must be the only"
1536                         " interface.\n");
1537                 ret = -EINVAL;
1538                 goto out;
1539         }
1540
1541         if (ath9k_uses_beacons(new_type) &&
1542             !ath9k_uses_beacons(vif->type)) {
1543                 if (sc->nbcnvifs >= ATH_BCBUF) {
1544                         ath_err(common, "No beacon slot available\n");
1545                         ret = -ENOBUFS;
1546                         goto out;
1547                 }
1548         }
1549
1550         /* Clean up old vif stuff */
1551         if (ath9k_uses_beacons(vif->type))
1552                 ath9k_reclaim_beacon(sc, vif);
1553
1554         /* Add new settings */
1555         vif->type = new_type;
1556         vif->p2p = p2p;
1557
1558         ath9k_do_vif_add_setup(hw, vif);
1559 out:
1560         ath9k_ps_restore(sc);
1561         mutex_unlock(&sc->mutex);
1562         return ret;
1563 }
1564
1565 static void ath9k_remove_interface(struct ieee80211_hw *hw,
1566                                    struct ieee80211_vif *vif)
1567 {
1568         struct ath_softc *sc = hw->priv;
1569         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1570
1571         ath_dbg(common, ATH_DBG_CONFIG, "Detach Interface\n");
1572
1573         ath9k_ps_wakeup(sc);
1574         mutex_lock(&sc->mutex);
1575
1576         sc->nvifs--;
1577
1578         /* Reclaim beacon resources */
1579         if (ath9k_uses_beacons(vif->type))
1580                 ath9k_reclaim_beacon(sc, vif);
1581
1582         ath9k_calculate_summary_state(hw, NULL);
1583
1584         mutex_unlock(&sc->mutex);
1585         ath9k_ps_restore(sc);
1586 }
1587
1588 static void ath9k_enable_ps(struct ath_softc *sc)
1589 {
1590         struct ath_hw *ah = sc->sc_ah;
1591
1592         sc->ps_enabled = true;
1593         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP)) {
1594                 if ((ah->imask & ATH9K_INT_TIM_TIMER) == 0) {
1595                         ah->imask |= ATH9K_INT_TIM_TIMER;
1596                         ath9k_hw_set_interrupts(ah, ah->imask);
1597                 }
1598                 ath9k_hw_setrxabort(ah, 1);
1599         }
1600 }
1601
1602 static void ath9k_disable_ps(struct ath_softc *sc)
1603 {
1604         struct ath_hw *ah = sc->sc_ah;
1605
1606         sc->ps_enabled = false;
1607         ath9k_hw_setpower(ah, ATH9K_PM_AWAKE);
1608         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP)) {
1609                 ath9k_hw_setrxabort(ah, 0);
1610                 sc->ps_flags &= ~(PS_WAIT_FOR_BEACON |
1611                                   PS_WAIT_FOR_CAB |
1612                                   PS_WAIT_FOR_PSPOLL_DATA |
1613                                   PS_WAIT_FOR_TX_ACK);
1614                 if (ah->imask & ATH9K_INT_TIM_TIMER) {
1615                         ah->imask &= ~ATH9K_INT_TIM_TIMER;
1616                         ath9k_hw_set_interrupts(ah, ah->imask);
1617                 }
1618         }
1619
1620 }
1621
1622 static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
1623 {
1624         struct ath_softc *sc = hw->priv;
1625         struct ath_hw *ah = sc->sc_ah;
1626         struct ath_common *common = ath9k_hw_common(ah);
1627         struct ieee80211_conf *conf = &hw->conf;
1628         bool disable_radio = false;
1629
1630         mutex_lock(&sc->mutex);
1631
1632         /*
1633          * Leave this as the first check because we need to turn on the
1634          * radio if it was disabled before prior to processing the rest
1635          * of the changes. Likewise we must only disable the radio towards
1636          * the end.
1637          */
1638         if (changed & IEEE80211_CONF_CHANGE_IDLE) {
1639                 sc->ps_idle = !!(conf->flags & IEEE80211_CONF_IDLE);
1640                 if (!sc->ps_idle) {
1641                         ath_radio_enable(sc, hw);
1642                         ath_dbg(common, ATH_DBG_CONFIG,
1643                                 "not-idle: enabling radio\n");
1644                 } else {
1645                         disable_radio = true;
1646                 }
1647         }
1648
1649         /*
1650          * We just prepare to enable PS. We have to wait until our AP has
1651          * ACK'd our null data frame to disable RX otherwise we'll ignore
1652          * those ACKs and end up retransmitting the same null data frames.
1653          * IEEE80211_CONF_CHANGE_PS is only passed by mac80211 for STA mode.
1654          */
1655         if (changed & IEEE80211_CONF_CHANGE_PS) {
1656                 unsigned long flags;
1657                 spin_lock_irqsave(&sc->sc_pm_lock, flags);
1658                 if (conf->flags & IEEE80211_CONF_PS)
1659                         ath9k_enable_ps(sc);
1660                 else
1661                         ath9k_disable_ps(sc);
1662                 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
1663         }
1664
1665         if (changed & IEEE80211_CONF_CHANGE_MONITOR) {
1666                 if (conf->flags & IEEE80211_CONF_MONITOR) {
1667                         ath_dbg(common, ATH_DBG_CONFIG,
1668                                 "Monitor mode is enabled\n");
1669                         sc->sc_ah->is_monitoring = true;
1670                 } else {
1671                         ath_dbg(common, ATH_DBG_CONFIG,
1672                                 "Monitor mode is disabled\n");
1673                         sc->sc_ah->is_monitoring = false;
1674                 }
1675         }
1676
1677         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
1678                 struct ieee80211_channel *curchan = hw->conf.channel;
1679                 int pos = curchan->hw_value;
1680                 int old_pos = -1;
1681                 unsigned long flags;
1682
1683                 if (ah->curchan)
1684                         old_pos = ah->curchan - &ah->channels[0];
1685
1686                 if (hw->conf.flags & IEEE80211_CONF_OFFCHANNEL)
1687                         sc->sc_flags |= SC_OP_OFFCHANNEL;
1688                 else
1689                         sc->sc_flags &= ~SC_OP_OFFCHANNEL;
1690
1691                 ath_dbg(common, ATH_DBG_CONFIG,
1692                         "Set channel: %d MHz type: %d\n",
1693                         curchan->center_freq, conf->channel_type);
1694
1695                 ath9k_cmn_update_ichannel(&sc->sc_ah->channels[pos],
1696                                           curchan, conf->channel_type);
1697
1698                 /* update survey stats for the old channel before switching */
1699                 spin_lock_irqsave(&common->cc_lock, flags);
1700                 ath_update_survey_stats(sc);
1701                 spin_unlock_irqrestore(&common->cc_lock, flags);
1702
1703                 /*
1704                  * If the operating channel changes, change the survey in-use flags
1705                  * along with it.
1706                  * Reset the survey data for the new channel, unless we're switching
1707                  * back to the operating channel from an off-channel operation.
1708                  */
1709                 if (!(hw->conf.flags & IEEE80211_CONF_OFFCHANNEL) &&
1710                     sc->cur_survey != &sc->survey[pos]) {
1711
1712                         if (sc->cur_survey)
1713                                 sc->cur_survey->filled &= ~SURVEY_INFO_IN_USE;
1714
1715                         sc->cur_survey = &sc->survey[pos];
1716
1717                         memset(sc->cur_survey, 0, sizeof(struct survey_info));
1718                         sc->cur_survey->filled |= SURVEY_INFO_IN_USE;
1719                 } else if (!(sc->survey[pos].filled & SURVEY_INFO_IN_USE)) {
1720                         memset(&sc->survey[pos], 0, sizeof(struct survey_info));
1721                 }
1722
1723                 if (ath_set_channel(sc, hw, &sc->sc_ah->channels[pos]) < 0) {
1724                         ath_err(common, "Unable to set channel\n");
1725                         mutex_unlock(&sc->mutex);
1726                         return -EINVAL;
1727                 }
1728
1729                 /*
1730                  * The most recent snapshot of channel->noisefloor for the old
1731                  * channel is only available after the hardware reset. Copy it to
1732                  * the survey stats now.
1733                  */
1734                 if (old_pos >= 0)
1735                         ath_update_survey_nf(sc, old_pos);
1736         }
1737
1738         if (changed & IEEE80211_CONF_CHANGE_POWER) {
1739                 ath_dbg(common, ATH_DBG_CONFIG,
1740                         "Set power: %d\n", conf->power_level);
1741                 sc->config.txpowlimit = 2 * conf->power_level;
1742                 ath9k_ps_wakeup(sc);
1743                 ath9k_cmn_update_txpow(ah, sc->curtxpow,
1744                                        sc->config.txpowlimit, &sc->curtxpow);
1745                 ath9k_ps_restore(sc);
1746         }
1747
1748         if (disable_radio) {
1749                 ath_dbg(common, ATH_DBG_CONFIG, "idle: disabling radio\n");
1750                 ath_radio_disable(sc, hw);
1751         }
1752
1753         mutex_unlock(&sc->mutex);
1754
1755         return 0;
1756 }
1757
1758 #define SUPPORTED_FILTERS                       \
1759         (FIF_PROMISC_IN_BSS |                   \
1760         FIF_ALLMULTI |                          \
1761         FIF_CONTROL |                           \
1762         FIF_PSPOLL |                            \
1763         FIF_OTHER_BSS |                         \
1764         FIF_BCN_PRBRESP_PROMISC |               \
1765         FIF_PROBE_REQ |                         \
1766         FIF_FCSFAIL)
1767
1768 /* FIXME: sc->sc_full_reset ? */
1769 static void ath9k_configure_filter(struct ieee80211_hw *hw,
1770                                    unsigned int changed_flags,
1771                                    unsigned int *total_flags,
1772                                    u64 multicast)
1773 {
1774         struct ath_softc *sc = hw->priv;
1775         u32 rfilt;
1776
1777         changed_flags &= SUPPORTED_FILTERS;
1778         *total_flags &= SUPPORTED_FILTERS;
1779
1780         sc->rx.rxfilter = *total_flags;
1781         ath9k_ps_wakeup(sc);
1782         rfilt = ath_calcrxfilter(sc);
1783         ath9k_hw_setrxfilter(sc->sc_ah, rfilt);
1784         ath9k_ps_restore(sc);
1785
1786         ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_CONFIG,
1787                 "Set HW RX filter: 0x%x\n", rfilt);
1788 }
1789
1790 static int ath9k_sta_add(struct ieee80211_hw *hw,
1791                          struct ieee80211_vif *vif,
1792                          struct ieee80211_sta *sta)
1793 {
1794         struct ath_softc *sc = hw->priv;
1795         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1796         struct ath_node *an = (struct ath_node *) sta->drv_priv;
1797         struct ieee80211_key_conf ps_key = { };
1798
1799         ath_node_attach(sc, sta);
1800
1801         if (vif->type != NL80211_IFTYPE_AP &&
1802             vif->type != NL80211_IFTYPE_AP_VLAN)
1803                 return 0;
1804
1805         an->ps_key = ath_key_config(common, vif, sta, &ps_key);
1806
1807         return 0;
1808 }
1809
1810 static void ath9k_del_ps_key(struct ath_softc *sc,
1811                              struct ieee80211_vif *vif,
1812                              struct ieee80211_sta *sta)
1813 {
1814         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1815         struct ath_node *an = (struct ath_node *) sta->drv_priv;
1816         struct ieee80211_key_conf ps_key = { .hw_key_idx = an->ps_key };
1817
1818         if (!an->ps_key)
1819             return;
1820
1821         ath_key_delete(common, &ps_key);
1822 }
1823
1824 static int ath9k_sta_remove(struct ieee80211_hw *hw,
1825                             struct ieee80211_vif *vif,
1826                             struct ieee80211_sta *sta)
1827 {
1828         struct ath_softc *sc = hw->priv;
1829
1830         ath9k_del_ps_key(sc, vif, sta);
1831         ath_node_detach(sc, sta);
1832
1833         return 0;
1834 }
1835
1836 static void ath9k_sta_notify(struct ieee80211_hw *hw,
1837                          struct ieee80211_vif *vif,
1838                          enum sta_notify_cmd cmd,
1839                          struct ieee80211_sta *sta)
1840 {
1841         struct ath_softc *sc = hw->priv;
1842         struct ath_node *an = (struct ath_node *) sta->drv_priv;
1843
1844         switch (cmd) {
1845         case STA_NOTIFY_SLEEP:
1846                 an->sleeping = true;
1847                 if (ath_tx_aggr_sleep(sc, an))
1848                         ieee80211_sta_set_tim(sta);
1849                 break;
1850         case STA_NOTIFY_AWAKE:
1851                 an->sleeping = false;
1852                 ath_tx_aggr_wakeup(sc, an);
1853                 break;
1854         }
1855 }
1856
1857 static int ath9k_conf_tx(struct ieee80211_hw *hw, u16 queue,
1858                          const struct ieee80211_tx_queue_params *params)
1859 {
1860         struct ath_softc *sc = hw->priv;
1861         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1862         struct ath_txq *txq;
1863         struct ath9k_tx_queue_info qi;
1864         int ret = 0;
1865
1866         if (queue >= WME_NUM_AC)
1867                 return 0;
1868
1869         txq = sc->tx.txq_map[queue];
1870
1871         ath9k_ps_wakeup(sc);
1872         mutex_lock(&sc->mutex);
1873
1874         memset(&qi, 0, sizeof(struct ath9k_tx_queue_info));
1875
1876         qi.tqi_aifs = params->aifs;
1877         qi.tqi_cwmin = params->cw_min;
1878         qi.tqi_cwmax = params->cw_max;
1879         qi.tqi_burstTime = params->txop;
1880
1881         ath_dbg(common, ATH_DBG_CONFIG,
1882                 "Configure tx [queue/halq] [%d/%d], aifs: %d, cw_min: %d, cw_max: %d, txop: %d\n",
1883                 queue, txq->axq_qnum, params->aifs, params->cw_min,
1884                 params->cw_max, params->txop);
1885
1886         ret = ath_txq_update(sc, txq->axq_qnum, &qi);
1887         if (ret)
1888                 ath_err(common, "TXQ Update failed\n");
1889
1890         if (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC)
1891                 if (queue == WME_AC_BE && !ret)
1892                         ath_beaconq_config(sc);
1893
1894         mutex_unlock(&sc->mutex);
1895         ath9k_ps_restore(sc);
1896
1897         return ret;
1898 }
1899
1900 static int ath9k_set_key(struct ieee80211_hw *hw,
1901                          enum set_key_cmd cmd,
1902                          struct ieee80211_vif *vif,
1903                          struct ieee80211_sta *sta,
1904                          struct ieee80211_key_conf *key)
1905 {
1906         struct ath_softc *sc = hw->priv;
1907         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1908         int ret = 0;
1909
1910         if (ath9k_modparam_nohwcrypt)
1911                 return -ENOSPC;
1912
1913         if (vif->type == NL80211_IFTYPE_ADHOC &&
1914             (key->cipher == WLAN_CIPHER_SUITE_TKIP ||
1915              key->cipher == WLAN_CIPHER_SUITE_CCMP) &&
1916             !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
1917                 /*
1918                  * For now, disable hw crypto for the RSN IBSS group keys. This
1919                  * could be optimized in the future to use a modified key cache
1920                  * design to support per-STA RX GTK, but until that gets
1921                  * implemented, use of software crypto for group addressed
1922                  * frames is a acceptable to allow RSN IBSS to be used.
1923                  */
1924                 return -EOPNOTSUPP;
1925         }
1926
1927         mutex_lock(&sc->mutex);
1928         ath9k_ps_wakeup(sc);
1929         ath_dbg(common, ATH_DBG_CONFIG, "Set HW Key\n");
1930
1931         switch (cmd) {
1932         case SET_KEY:
1933                 if (sta)
1934                         ath9k_del_ps_key(sc, vif, sta);
1935
1936                 ret = ath_key_config(common, vif, sta, key);
1937                 if (ret >= 0) {
1938                         key->hw_key_idx = ret;
1939                         /* push IV and Michael MIC generation to stack */
1940                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
1941                         if (key->cipher == WLAN_CIPHER_SUITE_TKIP)
1942                                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
1943                         if (sc->sc_ah->sw_mgmt_crypto &&
1944                             key->cipher == WLAN_CIPHER_SUITE_CCMP)
1945                                 key->flags |= IEEE80211_KEY_FLAG_SW_MGMT;
1946                         ret = 0;
1947                 }
1948                 break;
1949         case DISABLE_KEY:
1950                 ath_key_delete(common, key);
1951                 break;
1952         default:
1953                 ret = -EINVAL;
1954         }
1955
1956         ath9k_ps_restore(sc);
1957         mutex_unlock(&sc->mutex);
1958
1959         return ret;
1960 }
1961 static void ath9k_bss_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
1962 {
1963         struct ath_softc *sc = data;
1964         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1965         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
1966         struct ath_vif *avp = (void *)vif->drv_priv;
1967
1968         /*
1969          * Skip iteration if primary station vif's bss info
1970          * was not changed
1971          */
1972         if (sc->sc_flags & SC_OP_PRIM_STA_VIF)
1973                 return;
1974
1975         if (bss_conf->assoc) {
1976                 sc->sc_flags |= SC_OP_PRIM_STA_VIF;
1977                 avp->primary_sta_vif = true;
1978                 memcpy(common->curbssid, bss_conf->bssid, ETH_ALEN);
1979                 common->curaid = bss_conf->aid;
1980                 ath9k_hw_write_associd(sc->sc_ah);
1981                 ath_dbg(common, ATH_DBG_CONFIG,
1982                                 "Bss Info ASSOC %d, bssid: %pM\n",
1983                                 bss_conf->aid, common->curbssid);
1984                 ath_beacon_config(sc, vif);
1985                 /*
1986                  * Request a re-configuration of Beacon related timers
1987                  * on the receipt of the first Beacon frame (i.e.,
1988                  * after time sync with the AP).
1989                  */
1990                 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
1991                 /* Reset rssi stats */
1992                 sc->last_rssi = ATH_RSSI_DUMMY_MARKER;
1993                 sc->sc_ah->stats.avgbrssi = ATH_RSSI_DUMMY_MARKER;
1994
1995                 if (!common->disable_ani) {
1996                         sc->sc_flags |= SC_OP_ANI_RUN;
1997                         ath_start_ani(common);
1998                 }
1999
2000         }
2001 }
2002
2003 static void ath9k_config_bss(struct ath_softc *sc, struct ieee80211_vif *vif)
2004 {
2005         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
2006         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
2007         struct ath_vif *avp = (void *)vif->drv_priv;
2008
2009         if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION)
2010                 return;
2011
2012         /* Reconfigure bss info */
2013         if (avp->primary_sta_vif && !bss_conf->assoc) {
2014                 ath_dbg(common, ATH_DBG_CONFIG,
2015                         "Bss Info DISASSOC %d, bssid %pM\n",
2016                         common->curaid, common->curbssid);
2017                 sc->sc_flags &= ~(SC_OP_PRIM_STA_VIF | SC_OP_BEACONS);
2018                 avp->primary_sta_vif = false;
2019                 memset(common->curbssid, 0, ETH_ALEN);
2020                 common->curaid = 0;
2021         }
2022
2023         ieee80211_iterate_active_interfaces_atomic(
2024                         sc->hw, ath9k_bss_iter, sc);
2025
2026         /*
2027          * None of station vifs are associated.
2028          * Clear bssid & aid
2029          */
2030         if (!(sc->sc_flags & SC_OP_PRIM_STA_VIF)) {
2031                 ath9k_hw_write_associd(sc->sc_ah);
2032                 /* Stop ANI */
2033                 sc->sc_flags &= ~SC_OP_ANI_RUN;
2034                 del_timer_sync(&common->ani.timer);
2035         }
2036 }
2037
2038 static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
2039                                    struct ieee80211_vif *vif,
2040                                    struct ieee80211_bss_conf *bss_conf,
2041                                    u32 changed)
2042 {
2043         struct ath_softc *sc = hw->priv;
2044         struct ath_hw *ah = sc->sc_ah;
2045         struct ath_common *common = ath9k_hw_common(ah);
2046         struct ath_vif *avp = (void *)vif->drv_priv;
2047         int slottime;
2048         int error;
2049
2050         ath9k_ps_wakeup(sc);
2051         mutex_lock(&sc->mutex);
2052
2053         if (changed & BSS_CHANGED_BSSID) {
2054                 ath9k_config_bss(sc, vif);
2055
2056                 ath_dbg(common, ATH_DBG_CONFIG, "BSSID: %pM aid: 0x%x\n",
2057                         common->curbssid, common->curaid);
2058         }
2059
2060         if (changed & BSS_CHANGED_IBSS) {
2061                 /* There can be only one vif available */
2062                 memcpy(common->curbssid, bss_conf->bssid, ETH_ALEN);
2063                 common->curaid = bss_conf->aid;
2064                 ath9k_hw_write_associd(sc->sc_ah);
2065
2066                 if (bss_conf->ibss_joined) {
2067                         sc->sc_ah->stats.avgbrssi = ATH_RSSI_DUMMY_MARKER;
2068
2069                         if (!common->disable_ani) {
2070                                 sc->sc_flags |= SC_OP_ANI_RUN;
2071                                 ath_start_ani(common);
2072                         }
2073
2074                 } else {
2075                         sc->sc_flags &= ~SC_OP_ANI_RUN;
2076                         del_timer_sync(&common->ani.timer);
2077                 }
2078         }
2079
2080         /* Enable transmission of beacons (AP, IBSS, MESH) */
2081         if ((changed & BSS_CHANGED_BEACON) ||
2082             ((changed & BSS_CHANGED_BEACON_ENABLED) && bss_conf->enable_beacon)) {
2083                 ath9k_set_beaconing_status(sc, false);
2084                 error = ath_beacon_alloc(sc, vif);
2085                 if (!error)
2086                         ath_beacon_config(sc, vif);
2087                 ath9k_set_beaconing_status(sc, true);
2088         }
2089
2090         if (changed & BSS_CHANGED_ERP_SLOT) {
2091                 if (bss_conf->use_short_slot)
2092                         slottime = 9;
2093                 else
2094                         slottime = 20;
2095                 if (vif->type == NL80211_IFTYPE_AP) {
2096                         /*
2097                          * Defer update, so that connected stations can adjust
2098                          * their settings at the same time.
2099                          * See beacon.c for more details
2100                          */
2101                         sc->beacon.slottime = slottime;
2102                         sc->beacon.updateslot = UPDATE;
2103                 } else {
2104                         ah->slottime = slottime;
2105                         ath9k_hw_init_global_settings(ah);
2106                 }
2107         }
2108
2109         /* Disable transmission of beacons */
2110         if ((changed & BSS_CHANGED_BEACON_ENABLED) &&
2111             !bss_conf->enable_beacon) {
2112                 ath9k_set_beaconing_status(sc, false);
2113                 avp->is_bslot_active = false;
2114                 ath9k_set_beaconing_status(sc, true);
2115         }
2116
2117         if (changed & BSS_CHANGED_BEACON_INT) {
2118                 /*
2119                  * In case of AP mode, the HW TSF has to be reset
2120                  * when the beacon interval changes.
2121                  */
2122                 if (vif->type == NL80211_IFTYPE_AP) {
2123                         sc->sc_flags |= SC_OP_TSF_RESET;
2124                         ath9k_set_beaconing_status(sc, false);
2125                         error = ath_beacon_alloc(sc, vif);
2126                         if (!error)
2127                                 ath_beacon_config(sc, vif);
2128                         ath9k_set_beaconing_status(sc, true);
2129                 } else
2130                         ath_beacon_config(sc, vif);
2131         }
2132
2133         if (changed & BSS_CHANGED_ERP_PREAMBLE) {
2134                 ath_dbg(common, ATH_DBG_CONFIG, "BSS Changed PREAMBLE %d\n",
2135                         bss_conf->use_short_preamble);
2136                 if (bss_conf->use_short_preamble)
2137                         sc->sc_flags |= SC_OP_PREAMBLE_SHORT;
2138                 else
2139                         sc->sc_flags &= ~SC_OP_PREAMBLE_SHORT;
2140         }
2141
2142         if (changed & BSS_CHANGED_ERP_CTS_PROT) {
2143                 ath_dbg(common, ATH_DBG_CONFIG, "BSS Changed CTS PROT %d\n",
2144                         bss_conf->use_cts_prot);
2145                 if (bss_conf->use_cts_prot &&
2146                     hw->conf.channel->band != IEEE80211_BAND_5GHZ)
2147                         sc->sc_flags |= SC_OP_PROTECT_ENABLE;
2148                 else
2149                         sc->sc_flags &= ~SC_OP_PROTECT_ENABLE;
2150         }
2151
2152         mutex_unlock(&sc->mutex);
2153         ath9k_ps_restore(sc);
2154 }
2155
2156 static u64 ath9k_get_tsf(struct ieee80211_hw *hw)
2157 {
2158         struct ath_softc *sc = hw->priv;
2159         u64 tsf;
2160
2161         mutex_lock(&sc->mutex);
2162         ath9k_ps_wakeup(sc);
2163         tsf = ath9k_hw_gettsf64(sc->sc_ah);
2164         ath9k_ps_restore(sc);
2165         mutex_unlock(&sc->mutex);
2166
2167         return tsf;
2168 }
2169
2170 static void ath9k_set_tsf(struct ieee80211_hw *hw, u64 tsf)
2171 {
2172         struct ath_softc *sc = hw->priv;
2173
2174         mutex_lock(&sc->mutex);
2175         ath9k_ps_wakeup(sc);
2176         ath9k_hw_settsf64(sc->sc_ah, tsf);
2177         ath9k_ps_restore(sc);
2178         mutex_unlock(&sc->mutex);
2179 }
2180
2181 static void ath9k_reset_tsf(struct ieee80211_hw *hw)
2182 {
2183         struct ath_softc *sc = hw->priv;
2184
2185         mutex_lock(&sc->mutex);
2186
2187         ath9k_ps_wakeup(sc);
2188         ath9k_hw_reset_tsf(sc->sc_ah);
2189         ath9k_ps_restore(sc);
2190
2191         mutex_unlock(&sc->mutex);
2192 }
2193
2194 static int ath9k_ampdu_action(struct ieee80211_hw *hw,
2195                               struct ieee80211_vif *vif,
2196                               enum ieee80211_ampdu_mlme_action action,
2197                               struct ieee80211_sta *sta,
2198                               u16 tid, u16 *ssn, u8 buf_size)
2199 {
2200         struct ath_softc *sc = hw->priv;
2201         int ret = 0;
2202
2203         local_bh_disable();
2204
2205         switch (action) {
2206         case IEEE80211_AMPDU_RX_START:
2207                 if (!(sc->sc_flags & SC_OP_RXAGGR))
2208                         ret = -ENOTSUPP;
2209                 break;
2210         case IEEE80211_AMPDU_RX_STOP:
2211                 break;
2212         case IEEE80211_AMPDU_TX_START:
2213                 if (!(sc->sc_flags & SC_OP_TXAGGR))
2214                         return -EOPNOTSUPP;
2215
2216                 ath9k_ps_wakeup(sc);
2217                 ret = ath_tx_aggr_start(sc, sta, tid, ssn);
2218                 if (!ret)
2219                         ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
2220                 ath9k_ps_restore(sc);
2221                 break;
2222         case IEEE80211_AMPDU_TX_STOP:
2223                 ath9k_ps_wakeup(sc);
2224                 ath_tx_aggr_stop(sc, sta, tid);
2225                 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
2226                 ath9k_ps_restore(sc);
2227                 break;
2228         case IEEE80211_AMPDU_TX_OPERATIONAL:
2229                 ath9k_ps_wakeup(sc);
2230                 ath_tx_aggr_resume(sc, sta, tid);
2231                 ath9k_ps_restore(sc);
2232                 break;
2233         default:
2234                 ath_err(ath9k_hw_common(sc->sc_ah), "Unknown AMPDU action\n");
2235         }
2236
2237         local_bh_enable();
2238
2239         return ret;
2240 }
2241
2242 static int ath9k_get_survey(struct ieee80211_hw *hw, int idx,
2243                              struct survey_info *survey)
2244 {
2245         struct ath_softc *sc = hw->priv;
2246         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
2247         struct ieee80211_supported_band *sband;
2248         struct ieee80211_channel *chan;
2249         unsigned long flags;
2250         int pos;
2251
2252         spin_lock_irqsave(&common->cc_lock, flags);
2253         if (idx == 0)
2254                 ath_update_survey_stats(sc);
2255
2256         sband = hw->wiphy->bands[IEEE80211_BAND_2GHZ];
2257         if (sband && idx >= sband->n_channels) {
2258                 idx -= sband->n_channels;
2259                 sband = NULL;
2260         }
2261
2262         if (!sband)
2263                 sband = hw->wiphy->bands[IEEE80211_BAND_5GHZ];
2264
2265         if (!sband || idx >= sband->n_channels) {
2266                 spin_unlock_irqrestore(&common->cc_lock, flags);
2267                 return -ENOENT;
2268         }
2269
2270         chan = &sband->channels[idx];
2271         pos = chan->hw_value;
2272         memcpy(survey, &sc->survey[pos], sizeof(*survey));
2273         survey->channel = chan;
2274         spin_unlock_irqrestore(&common->cc_lock, flags);
2275
2276         return 0;
2277 }
2278
2279 static void ath9k_set_coverage_class(struct ieee80211_hw *hw, u8 coverage_class)
2280 {
2281         struct ath_softc *sc = hw->priv;
2282         struct ath_hw *ah = sc->sc_ah;
2283
2284         mutex_lock(&sc->mutex);
2285         ah->coverage_class = coverage_class;
2286         ath9k_hw_init_global_settings(ah);
2287         mutex_unlock(&sc->mutex);
2288 }
2289
2290 static void ath9k_flush(struct ieee80211_hw *hw, bool drop)
2291 {
2292         struct ath_softc *sc = hw->priv;
2293         struct ath_hw *ah = sc->sc_ah;
2294         struct ath_common *common = ath9k_hw_common(ah);
2295         int timeout = 200; /* ms */
2296         int i, j;
2297         bool drain_txq;
2298
2299         mutex_lock(&sc->mutex);
2300         cancel_delayed_work_sync(&sc->tx_complete_work);
2301
2302         if (sc->sc_flags & SC_OP_INVALID) {
2303                 ath_dbg(common, ATH_DBG_ANY, "Device not present\n");
2304                 mutex_unlock(&sc->mutex);
2305                 return;
2306         }
2307
2308         if (drop)
2309                 timeout = 1;
2310
2311         for (j = 0; j < timeout; j++) {
2312                 bool npend = false;
2313
2314                 if (j)
2315                         usleep_range(1000, 2000);
2316
2317                 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
2318                         if (!ATH_TXQ_SETUP(sc, i))
2319                                 continue;
2320
2321                         npend = ath9k_has_pending_frames(sc, &sc->tx.txq[i]);
2322
2323                         if (npend)
2324                                 break;
2325                 }
2326
2327                 if (!npend)
2328                     goto out;
2329         }
2330
2331         ath9k_ps_wakeup(sc);
2332         spin_lock_bh(&sc->sc_pcu_lock);
2333         drain_txq = ath_drain_all_txq(sc, false);
2334         if (!drain_txq)
2335                 ath_reset(sc, false);
2336         spin_unlock_bh(&sc->sc_pcu_lock);
2337         ath9k_ps_restore(sc);
2338         ieee80211_wake_queues(hw);
2339
2340 out:
2341         ieee80211_queue_delayed_work(hw, &sc->tx_complete_work, 0);
2342         mutex_unlock(&sc->mutex);
2343 }
2344
2345 static bool ath9k_tx_frames_pending(struct ieee80211_hw *hw)
2346 {
2347         struct ath_softc *sc = hw->priv;
2348         int i;
2349
2350         for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
2351                 if (!ATH_TXQ_SETUP(sc, i))
2352                         continue;
2353
2354                 if (ath9k_has_pending_frames(sc, &sc->tx.txq[i]))
2355                         return true;
2356         }
2357         return false;
2358 }
2359
2360 static int ath9k_tx_last_beacon(struct ieee80211_hw *hw)
2361 {
2362         struct ath_softc *sc = hw->priv;
2363         struct ath_hw *ah = sc->sc_ah;
2364         struct ieee80211_vif *vif;
2365         struct ath_vif *avp;
2366         struct ath_buf *bf;
2367         struct ath_tx_status ts;
2368         int status;
2369
2370         vif = sc->beacon.bslot[0];
2371         if (!vif)
2372                 return 0;
2373
2374         avp = (void *)vif->drv_priv;
2375         if (!avp->is_bslot_active)
2376                 return 0;
2377
2378         if (!sc->beacon.tx_processed) {
2379                 tasklet_disable(&sc->bcon_tasklet);
2380
2381                 bf = avp->av_bcbuf;
2382                 if (!bf || !bf->bf_mpdu)
2383                         goto skip;
2384
2385                 status = ath9k_hw_txprocdesc(ah, bf->bf_desc, &ts);
2386                 if (status == -EINPROGRESS)
2387                         goto skip;
2388
2389                 sc->beacon.tx_processed = true;
2390                 sc->beacon.tx_last = !(ts.ts_status & ATH9K_TXERR_MASK);
2391
2392 skip:
2393                 tasklet_enable(&sc->bcon_tasklet);
2394         }
2395
2396         return sc->beacon.tx_last;
2397 }
2398
2399 struct ieee80211_ops ath9k_ops = {
2400         .tx                 = ath9k_tx,
2401         .start              = ath9k_start,
2402         .stop               = ath9k_stop,
2403         .add_interface      = ath9k_add_interface,
2404         .change_interface   = ath9k_change_interface,
2405         .remove_interface   = ath9k_remove_interface,
2406         .config             = ath9k_config,
2407         .configure_filter   = ath9k_configure_filter,
2408         .sta_add            = ath9k_sta_add,
2409         .sta_remove         = ath9k_sta_remove,
2410         .sta_notify         = ath9k_sta_notify,
2411         .conf_tx            = ath9k_conf_tx,
2412         .bss_info_changed   = ath9k_bss_info_changed,
2413         .set_key            = ath9k_set_key,
2414         .get_tsf            = ath9k_get_tsf,
2415         .set_tsf            = ath9k_set_tsf,
2416         .reset_tsf          = ath9k_reset_tsf,
2417         .ampdu_action       = ath9k_ampdu_action,
2418         .get_survey         = ath9k_get_survey,
2419         .rfkill_poll        = ath9k_rfkill_poll_state,
2420         .set_coverage_class = ath9k_set_coverage_class,
2421         .flush              = ath9k_flush,
2422         .tx_frames_pending  = ath9k_tx_frames_pending,
2423         .tx_last_beacon = ath9k_tx_last_beacon,
2424 };