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

   1 /*
   2  * Copyright (c) 2012 Qualcomm Atheros, 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 "ath9k.h"
  18
  19 /*
  20  * TX polling - checks if the TX engine is stuck somewhere
  21  * and issues a chip reset if so.
  22  */
  23 void ath_tx_complete_poll_work(struct work_struct *work)
  24 {
  25         struct ath_softc *sc = container_of(work, struct ath_softc,
  26                                             tx_complete_work.work);
  27         struct ath_txq *txq;
  28         int i;
  29         bool needreset = false;
  30
  31         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
  32                 txq = sc->tx.txq_map[i];
  33
  34                 ath_txq_lock(sc, txq);
  35                 if (txq->axq_depth) {
  36                         if (txq->axq_tx_inprogress) {
  37                                 needreset = true;
  38                                 ath_txq_unlock(sc, txq);
  39                                 break;
  40                         } else {
  41                                 txq->axq_tx_inprogress = true;
  42                         }
  43                 }
  44                 ath_txq_unlock(sc, txq);
  45         }
  46
  47         if (needreset) {
  48                 ath_dbg(ath9k_hw_common(sc->sc_ah), RESET,
  49                         "tx hung, resetting the chip\n");
  50                 ath9k_queue_reset(sc, RESET_TYPE_TX_HANG);
  51                 return;
  52         }
  53
  54         ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work,
  55                                      msecs_to_jiffies(ATH_TX_COMPLETE_POLL_INT));
  56 }
  57
  58 /*
  59  * Checks if the BB/MAC is hung.
  60  */
  61 void ath_hw_check(struct work_struct *work)
  62 {
  63         struct ath_softc *sc = container_of(work, struct ath_softc, hw_check_work);
  64         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  65         unsigned long flags;
  66         int busy;
  67         u8 is_alive, nbeacon = 1;
  68         enum ath_reset_type type;
  69
  70         ath9k_ps_wakeup(sc);
  71         is_alive = ath9k_hw_check_alive(sc->sc_ah);
  72
  73         if (is_alive && !AR_SREV_9300(sc->sc_ah))
  74                 goto out;
  75         else if (!is_alive && AR_SREV_9300(sc->sc_ah)) {
  76                 ath_dbg(common, RESET,
  77                         "DCU stuck is detected. Schedule chip reset\n");
  78                 type = RESET_TYPE_MAC_HANG;
  79                 goto sched_reset;
  80         }
  81
  82         spin_lock_irqsave(&common->cc_lock, flags);
  83         busy = ath_update_survey_stats(sc);
  84         spin_unlock_irqrestore(&common->cc_lock, flags);
  85
  86         ath_dbg(common, RESET, "Possible baseband hang, busy=%d (try %d)\n",
  87                 busy, sc->hw_busy_count + 1);
  88         if (busy >= 99) {
  89                 if (++sc->hw_busy_count >= 3) {
  90                         type = RESET_TYPE_BB_HANG;
  91                         goto sched_reset;
  92                 }
  93         } else if (busy >= 0) {
  94                 sc->hw_busy_count = 0;
  95                 nbeacon = 3;
  96         }
  97
  98         ath_start_rx_poll(sc, nbeacon);
  99         goto out;
 100
 101 sched_reset:
 102         ath9k_queue_reset(sc, type);
 103 out:
 104         ath9k_ps_restore(sc);
 105 }
 106
 107 /*
 108  * PLL-WAR for AR9485/AR9340
 109  */
 110 static bool ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum)
 111 {
 112         static int count;
 113         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 114
 115         if (pll_sqsum >= 0x40000) {
 116                 count++;
 117                 if (count == 3) {
 118                         ath_dbg(common, RESET, "PLL WAR, resetting the chip\n");
 119                         ath9k_queue_reset(sc, RESET_TYPE_PLL_HANG);
 120                         count = 0;
 121                         return true;
 122                 }
 123         } else {
 124                 count = 0;
 125         }
 126
 127         return false;
 128 }
 129
 130 void ath_hw_pll_work(struct work_struct *work)
 131 {
 132         u32 pll_sqsum;
 133         struct ath_softc *sc = container_of(work, struct ath_softc,
 134                                             hw_pll_work.work);
 135         /*
 136          * ensure that the PLL WAR is executed only
 137          * after the STA is associated (or) if the
 138          * beaconing had started in interfaces that
 139          * uses beacons.
 140          */
 141         if (!test_bit(SC_OP_BEACONS, &sc->sc_flags))
 142                 return;
 143
 144         ath9k_ps_wakeup(sc);
 145         pll_sqsum = ar9003_get_pll_sqsum_dvc(sc->sc_ah);
 146         ath9k_ps_restore(sc);
 147         if (ath_hw_pll_rx_hang_check(sc, pll_sqsum))
 148                 return;
 149
 150         ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work,
 151                                      msecs_to_jiffies(ATH_PLL_WORK_INTERVAL));
 152 }
 153
 154 /*
 155  * RX Polling - monitors baseband hangs.
 156  */
 157 void ath_start_rx_poll(struct ath_softc *sc, u8 nbeacon)
 158 {
 159         if (!AR_SREV_9300(sc->sc_ah))
 160                 return;
 161
 162         if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags))
 163                 return;
 164
 165         mod_timer(&sc->rx_poll_timer, jiffies + msecs_to_jiffies
 166                   (nbeacon * sc->cur_beacon_conf.beacon_interval));
 167 }
 168
 169 void ath_rx_poll(unsigned long data)
 170 {
 171         struct ath_softc *sc = (struct ath_softc *)data;
 172
 173         if (!test_bit(SC_OP_INVALID, &sc->sc_flags))
 174                 ieee80211_queue_work(sc->hw, &sc->hw_check_work);
 175 }
 176
 177 /*
 178  * PA Pre-distortion.
 179  */
 180 static void ath_paprd_activate(struct ath_softc *sc)
 181 {
 182         struct ath_hw *ah = sc->sc_ah;
 183         struct ath_common *common = ath9k_hw_common(ah);
 184         struct ath9k_hw_cal_data *caldata = ah->caldata;
 185         int chain;
 186
 187         if (!caldata || !test_bit(PAPRD_DONE, &caldata->cal_flags)) {
 188                 ath_dbg(common, CALIBRATE, "Failed to activate PAPRD\n");
 189                 return;
 190         }
 191
 192         ar9003_paprd_enable(ah, false);
 193         for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
 194                 if (!(ah->txchainmask & BIT(chain)))
 195                         continue;
 196
 197                 ar9003_paprd_populate_single_table(ah, caldata, chain);
 198         }
 199
 200         ath_dbg(common, CALIBRATE, "Activating PAPRD\n");
 201         ar9003_paprd_enable(ah, true);
 202 }
 203
 204 static bool ath_paprd_send_frame(struct ath_softc *sc, struct sk_buff *skb, int chain)
 205 {
 206         struct ieee80211_hw *hw = sc->hw;
 207         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 208         struct ath_hw *ah = sc->sc_ah;
 209         struct ath_common *common = ath9k_hw_common(ah);
 210         struct ath_tx_control txctl;
 211         int time_left;
 212
 213         memset(&txctl, 0, sizeof(txctl));
 214         txctl.txq = sc->tx.txq_map[IEEE80211_AC_BE];
 215
 216         memset(tx_info, 0, sizeof(*tx_info));
 217         tx_info->band = hw->conf.chandef.chan->band;
 218         tx_info->flags |= IEEE80211_TX_CTL_NO_ACK;
 219         tx_info->control.rates[0].idx = 0;
 220         tx_info->control.rates[0].count = 1;
 221         tx_info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
 222         tx_info->control.rates[1].idx = -1;
 223
 224         init_completion(&sc->paprd_complete);
 225         txctl.paprd = BIT(chain);
 226
 227         if (ath_tx_start(hw, skb, &txctl) != 0) {
 228                 ath_dbg(common, CALIBRATE, "PAPRD TX failed\n");
 229                 dev_kfree_skb_any(skb);
 230                 return false;
 231         }
 232
 233         time_left = wait_for_completion_timeout(&sc->paprd_complete,
 234                         msecs_to_jiffies(ATH_PAPRD_TIMEOUT));
 235
 236         if (!time_left)
 237                 ath_dbg(common, CALIBRATE,
 238                         "Timeout waiting for paprd training on TX chain %d\n",
 239                         chain);
 240
 241         return !!time_left;
 242 }
 243
 244 void ath_paprd_calibrate(struct work_struct *work)
 245 {
 246         struct ath_softc *sc = container_of(work, struct ath_softc, paprd_work);
 247         struct ieee80211_hw *hw = sc->hw;
 248         struct ath_hw *ah = sc->sc_ah;
 249         struct ieee80211_hdr *hdr;
 250         struct sk_buff *skb = NULL;
 251         struct ath9k_hw_cal_data *caldata = ah->caldata;
 252         struct ath_common *common = ath9k_hw_common(ah);
 253         int ftype;
 254         int chain_ok = 0;
 255         int chain;
 256         int len = 1800;
 257         int ret;
 258
 259         if (!caldata ||
 260             !test_bit(PAPRD_PACKET_SENT, &caldata->cal_flags) ||
 261             test_bit(PAPRD_DONE, &caldata->cal_flags)) {
 262                 ath_dbg(common, CALIBRATE, "Skipping PAPRD calibration\n");
 263                 return;
 264         }
 265
 266         ath9k_ps_wakeup(sc);
 267
 268         if (ar9003_paprd_init_table(ah) < 0)
 269                 goto fail_paprd;
 270
 271         skb = alloc_skb(len, GFP_KERNEL);
 272         if (!skb)
 273                 goto fail_paprd;
 274
 275         skb_put(skb, len);
 276         memset(skb->data, 0, len);
 277         hdr = (struct ieee80211_hdr *)skb->data;
 278         ftype = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC;
 279         hdr->frame_control = cpu_to_le16(ftype);
 280         hdr->duration_id = cpu_to_le16(10);
 281         memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN);
 282         memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
 283         memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);
 284
 285         for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
 286                 if (!(ah->txchainmask & BIT(chain)))
 287                         continue;
 288
 289                 chain_ok = 0;
 290                 ar9003_paprd_setup_gain_table(ah, chain);
 291
 292                 ath_dbg(common, CALIBRATE,
 293                         "Sending PAPRD training frame on chain %d\n", chain);
 294                 if (!ath_paprd_send_frame(sc, skb, chain))
 295                         goto fail_paprd;
 296
 297                 if (!ar9003_paprd_is_done(ah)) {
 298                         ath_dbg(common, CALIBRATE,
 299                                 "PAPRD not yet done on chain %d\n", chain);
 300                         break;
 301                 }
 302
 303                 ret = ar9003_paprd_create_curve(ah, caldata, chain);
 304                 if (ret == -EINPROGRESS) {
 305                         ath_dbg(common, CALIBRATE,
 306                                 "PAPRD curve on chain %d needs to be re-trained\n",
 307                                 chain);
 308                         break;
 309                 } else if (ret) {
 310                         ath_dbg(common, CALIBRATE,
 311                                 "PAPRD create curve failed on chain %d\n",
 312                                 chain);
 313                         break;
 314                 }
 315
 316                 chain_ok = 1;
 317         }
 318         kfree_skb(skb);
 319
 320         if (chain_ok) {
 321                 set_bit(PAPRD_DONE, &caldata->cal_flags);
 322                 ath_paprd_activate(sc);
 323         }
 324
 325 fail_paprd:
 326         ath9k_ps_restore(sc);
 327 }
 328
 329 /*
 330  *  ANI performs periodic noise floor calibration
 331  *  that is used to adjust and optimize the chip performance.  This
 332  *  takes environmental changes (location, temperature) into account.
 333  *  When the task is complete, it reschedules itself depending on the
 334  *  appropriate interval that was calculated.
 335  */
 336 void ath_ani_calibrate(unsigned long data)
 337 {
 338         struct ath_softc *sc = (struct ath_softc *)data;
 339         struct ath_hw *ah = sc->sc_ah;
 340         struct ath_common *common = ath9k_hw_common(ah);
 341         bool longcal = false;
 342         bool shortcal = false;
 343         bool aniflag = false;
 344         unsigned int timestamp = jiffies_to_msecs(jiffies);
 345         u32 cal_interval, short_cal_interval, long_cal_interval;
 346         unsigned long flags;
 347
 348         if (ah->caldata && test_bit(NFCAL_INTF, &ah->caldata->cal_flags))
 349                 long_cal_interval = ATH_LONG_CALINTERVAL_INT;
 350         else
 351                 long_cal_interval = ATH_LONG_CALINTERVAL;
 352
 353         short_cal_interval = (ah->opmode == NL80211_IFTYPE_AP) ?
 354                 ATH_AP_SHORT_CALINTERVAL : ATH_STA_SHORT_CALINTERVAL;
 355
 356         /* Only calibrate if awake */
 357         if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE) {
 358                 if (++ah->ani_skip_count >= ATH_ANI_MAX_SKIP_COUNT) {
 359                         spin_lock_irqsave(&sc->sc_pm_lock, flags);
 360                         sc->ps_flags |= PS_WAIT_FOR_ANI;
 361                         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 362                 }
 363                 goto set_timer;
 364         }
 365         ah->ani_skip_count = 0;
 366         spin_lock_irqsave(&sc->sc_pm_lock, flags);
 367         sc->ps_flags &= ~PS_WAIT_FOR_ANI;
 368         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 369
 370         ath9k_ps_wakeup(sc);
 371
 372         /* Long calibration runs independently of short calibration. */
 373         if ((timestamp - common->ani.longcal_timer) >= long_cal_interval) {
 374                 longcal = true;
 375                 common->ani.longcal_timer = timestamp;
 376         }
 377
 378         /* Short calibration applies only while caldone is false */
 379         if (!common->ani.caldone) {
 380                 if ((timestamp - common->ani.shortcal_timer) >= short_cal_interval) {
 381                         shortcal = true;
 382                         common->ani.shortcal_timer = timestamp;
 383                         common->ani.resetcal_timer = timestamp;
 384                 }
 385         } else {
 386                 if ((timestamp - common->ani.resetcal_timer) >=
 387                     ATH_RESTART_CALINTERVAL) {
 388                         common->ani.caldone = ath9k_hw_reset_calvalid(ah);
 389                         if (common->ani.caldone)
 390                                 common->ani.resetcal_timer = timestamp;
 391                 }
 392         }
 393
 394         /* Verify whether we must check ANI */
 395         if ((timestamp - common->ani.checkani_timer) >= ah->config.ani_poll_interval) {
 396                 aniflag = true;
 397                 common->ani.checkani_timer = timestamp;
 398         }
 399
 400         /* Call ANI routine if necessary */
 401         if (aniflag) {
 402                 spin_lock_irqsave(&common->cc_lock, flags);
 403                 ath9k_hw_ani_monitor(ah, ah->curchan);
 404                 ath_update_survey_stats(sc);
 405                 spin_unlock_irqrestore(&common->cc_lock, flags);
 406         }
 407
 408         /* Perform calibration if necessary */
 409         if (longcal || shortcal) {
 410                 common->ani.caldone =
 411                         ath9k_hw_calibrate(ah, ah->curchan,
 412                                            ah->rxchainmask, longcal);
 413         }
 414
 415         ath_dbg(common, ANI,
 416                 "Calibration @%lu finished: %s %s %s, caldone: %s\n",
 417                 jiffies,
 418                 longcal ? "long" : "", shortcal ? "short" : "",
 419                 aniflag ? "ani" : "", common->ani.caldone ? "true" : "false");
 420
 421         ath9k_ps_restore(sc);
 422
 423 set_timer:
 424         /*
 425         * Set timer interval based on previous results.
 426         * The interval must be the shortest necessary to satisfy ANI,
 427         * short calibration and long calibration.
 428         */
 429         cal_interval = ATH_LONG_CALINTERVAL;
 430         cal_interval = min(cal_interval, (u32)ah->config.ani_poll_interval);
 431         if (!common->ani.caldone)
 432                 cal_interval = min(cal_interval, (u32)short_cal_interval);
 433
 434         mod_timer(&common->ani.timer, jiffies + msecs_to_jiffies(cal_interval));
 435
 436         if (ar9003_is_paprd_enabled(ah) && ah->caldata) {
 437                 if (!test_bit(PAPRD_DONE, &ah->caldata->cal_flags)) {
 438                         ieee80211_queue_work(sc->hw, &sc->paprd_work);
 439                 } else if (!ah->paprd_table_write_done) {
 440                         ath9k_ps_wakeup(sc);
 441                         ath_paprd_activate(sc);
 442                         ath9k_ps_restore(sc);
 443                 }
 444         }
 445 }
 446
 447 void ath_start_ani(struct ath_softc *sc)
 448 {
 449         struct ath_hw *ah = sc->sc_ah;
 450         struct ath_common *common = ath9k_hw_common(ah);
 451         unsigned long timestamp = jiffies_to_msecs(jiffies);
 452
 453         if (common->disable_ani ||
 454             !test_bit(SC_OP_ANI_RUN, &sc->sc_flags) ||
 455             (sc->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL))
 456                 return;
 457
 458         common->ani.longcal_timer = timestamp;
 459         common->ani.shortcal_timer = timestamp;
 460         common->ani.checkani_timer = timestamp;
 461
 462         ath_dbg(common, ANI, "Starting ANI\n");
 463         mod_timer(&common->ani.timer,
 464                   jiffies + msecs_to_jiffies((u32)ah->config.ani_poll_interval));
 465 }
 466
 467 void ath_stop_ani(struct ath_softc *sc)
 468 {
 469         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 470
 471         ath_dbg(common, ANI, "Stopping ANI\n");
 472         del_timer_sync(&common->ani.timer);
 473 }
 474
 475 void ath_check_ani(struct ath_softc *sc)
 476 {
 477         struct ath_hw *ah = sc->sc_ah;
 478         struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
 479
 480         /*
 481          * Check for the various conditions in which ANI has to
 482          * be stopped.
 483          */
 484         if (ah->opmode == NL80211_IFTYPE_ADHOC) {
 485                 if (!cur_conf->enable_beacon)
 486                         goto stop_ani;
 487         } else if (ah->opmode == NL80211_IFTYPE_AP) {
 488                 if (!cur_conf->enable_beacon) {
 489                         /*
 490                          * Disable ANI only when there are no
 491                          * associated stations.
 492                          */
 493                         if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags))
 494                                 goto stop_ani;
 495                 }
 496         } else if (ah->opmode == NL80211_IFTYPE_STATION) {
 497                 if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags))
 498                         goto stop_ani;
 499         }
 500
 501         if (!test_bit(SC_OP_ANI_RUN, &sc->sc_flags)) {
 502                 set_bit(SC_OP_ANI_RUN, &sc->sc_flags);
 503                 ath_start_ani(sc);
 504         }
 505
 506         return;
 507
 508 stop_ani:
 509         clear_bit(SC_OP_ANI_RUN, &sc->sc_flags);
 510         ath_stop_ani(sc);
 511 }
 512
 513 void ath_update_survey_nf(struct ath_softc *sc, int channel)
 514 {
 515         struct ath_hw *ah = sc->sc_ah;
 516         struct ath9k_channel *chan = &ah->channels[channel];
 517         struct survey_info *survey = &sc->survey[channel];
 518
 519         if (chan->noisefloor) {
 520                 survey->filled |= SURVEY_INFO_NOISE_DBM;
 521                 survey->noise = ath9k_hw_getchan_noise(ah, chan);
 522         }
 523 }
 524
 525 /*
 526  * Updates the survey statistics and returns the busy time since last
 527  * update in %, if the measurement duration was long enough for the
 528  * result to be useful, -1 otherwise.
 529  */
 530 int ath_update_survey_stats(struct ath_softc *sc)
 531 {
 532         struct ath_hw *ah = sc->sc_ah;
 533         struct ath_common *common = ath9k_hw_common(ah);
 534         int pos = ah->curchan - &ah->channels[0];
 535         struct survey_info *survey = &sc->survey[pos];
 536         struct ath_cycle_counters *cc = &common->cc_survey;
 537         unsigned int div = common->clockrate * 1000;
 538         int ret = 0;
 539
 540         if (!ah->curchan)
 541                 return -1;
 542
 543         if (ah->power_mode == ATH9K_PM_AWAKE)
 544                 ath_hw_cycle_counters_update(common);
 545
 546         if (cc->cycles > 0) {
 547                 survey->filled |= SURVEY_INFO_CHANNEL_TIME |
 548                         SURVEY_INFO_CHANNEL_TIME_BUSY |
 549                         SURVEY_INFO_CHANNEL_TIME_RX |
 550                         SURVEY_INFO_CHANNEL_TIME_TX;
 551                 survey->channel_time += cc->cycles / div;
 552                 survey->channel_time_busy += cc->rx_busy / div;
 553                 survey->channel_time_rx += cc->rx_frame / div;
 554                 survey->channel_time_tx += cc->tx_frame / div;
 555         }
 556
 557         if (cc->cycles < div)
 558                 return -1;
 559
 560         if (cc->cycles > 0)
 561                 ret = cc->rx_busy * 100 / cc->cycles;
 562
 563         memset(cc, 0, sizeof(*cc));
 564
 565         ath_update_survey_nf(sc, pos);
 566
 567         return ret;
 568 }