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 static bool ath_tx_complete_check(struct ath_softc *sc)
  24 {
  25         struct ath_txq *txq;
  26         int i;
  27
  28         if (sc->tx99_state)
  29                 return true;
  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                                 ath_txq_unlock(sc, txq);
  38                                 goto reset;
  39                         }
  40
  41                         txq->axq_tx_inprogress = true;
  42                 }
  43                 ath_txq_unlock(sc, txq);
  44         }
  45
  46         return true;
  47
  48 reset:
  49         ath_dbg(ath9k_hw_common(sc->sc_ah), RESET,
  50                 "tx hung, resetting the chip\n");
  51         ath9k_queue_reset(sc, RESET_TYPE_TX_HANG);
  52         return false;
  53
  54 }
  55
  56 void ath_hw_check_work(struct work_struct *work)
  57 {
  58         struct ath_softc *sc = container_of(work, struct ath_softc,
  59                                             hw_check_work.work);
  60
  61         if (!ath_hw_check(sc) ||
  62             !ath_tx_complete_check(sc))
  63                 return;
  64
  65         ieee80211_queue_delayed_work(sc->hw, &sc->hw_check_work,
  66                                      msecs_to_jiffies(ATH_HW_CHECK_POLL_INT));
  67 }
  68
  69 /*
  70  * Checks if the BB/MAC is hung.
  71  */
  72 bool ath_hw_check(struct ath_softc *sc)
  73 {
  74         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  75         enum ath_reset_type type;
  76         bool is_alive;
  77
  78         ath9k_ps_wakeup(sc);
  79
  80         is_alive = ath9k_hw_check_alive(sc->sc_ah);
  81
  82         if (!is_alive) {
  83                 ath_dbg(common, RESET,
  84                         "HW hang detected, schedule chip reset\n");
  85                 type = RESET_TYPE_MAC_HANG;
  86                 ath9k_queue_reset(sc, type);
  87         }
  88
  89         ath9k_ps_restore(sc);
  90
  91         return is_alive;
  92 }
  93
  94 /*
  95  * PLL-WAR for AR9485/AR9340
  96  */
  97 static bool ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum)
  98 {
  99         static int count;
 100         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 101
 102         if (pll_sqsum >= 0x40000) {
 103                 count++;
 104                 if (count == 3) {
 105                         ath_dbg(common, RESET, "PLL WAR, resetting the chip\n");
 106                         ath9k_queue_reset(sc, RESET_TYPE_PLL_HANG);
 107                         count = 0;
 108                         return true;
 109                 }
 110         } else {
 111                 count = 0;
 112         }
 113
 114         return false;
 115 }
 116
 117 void ath_hw_pll_work(struct work_struct *work)
 118 {
 119         u32 pll_sqsum;
 120         struct ath_softc *sc = container_of(work, struct ath_softc,
 121                                             hw_pll_work.work);
 122         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 123         /*
 124          * ensure that the PLL WAR is executed only
 125          * after the STA is associated (or) if the
 126          * beaconing had started in interfaces that
 127          * uses beacons.
 128          */
 129         if (!test_bit(ATH_OP_BEACONS, &common->op_flags))
 130                 return;
 131
 132         if (sc->tx99_state)
 133                 return;
 134
 135         ath9k_ps_wakeup(sc);
 136         pll_sqsum = ar9003_get_pll_sqsum_dvc(sc->sc_ah);
 137         ath9k_ps_restore(sc);
 138         if (ath_hw_pll_rx_hang_check(sc, pll_sqsum))
 139                 return;
 140
 141         ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work,
 142                                      msecs_to_jiffies(ATH_PLL_WORK_INTERVAL));
 143 }
 144
 145 /*
 146  * PA Pre-distortion.
 147  */
 148 static void ath_paprd_activate(struct ath_softc *sc)
 149 {
 150         struct ath_hw *ah = sc->sc_ah;
 151         struct ath_common *common = ath9k_hw_common(ah);
 152         struct ath9k_hw_cal_data *caldata = ah->caldata;
 153         int chain;
 154
 155         if (!caldata || !test_bit(PAPRD_DONE, &caldata->cal_flags)) {
 156                 ath_dbg(common, CALIBRATE, "Failed to activate PAPRD\n");
 157                 return;
 158         }
 159
 160         ar9003_paprd_enable(ah, false);
 161         for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
 162                 if (!(ah->txchainmask & BIT(chain)))
 163                         continue;
 164
 165                 ar9003_paprd_populate_single_table(ah, caldata, chain);
 166         }
 167
 168         ath_dbg(common, CALIBRATE, "Activating PAPRD\n");
 169         ar9003_paprd_enable(ah, true);
 170 }
 171
 172 static bool ath_paprd_send_frame(struct ath_softc *sc, struct sk_buff *skb, int chain)
 173 {
 174         struct ieee80211_hw *hw = sc->hw;
 175         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 176         struct ath_hw *ah = sc->sc_ah;
 177         struct ath_common *common = ath9k_hw_common(ah);
 178         struct ath_tx_control txctl;
 179         unsigned long time_left;
 180
 181         memset(&txctl, 0, sizeof(txctl));
 182         txctl.txq = sc->tx.txq_map[IEEE80211_AC_BE];
 183
 184         memset(tx_info, 0, sizeof(*tx_info));
 185         tx_info->band = sc->cur_chandef.chan->band;
 186         tx_info->flags |= IEEE80211_TX_CTL_NO_ACK;
 187         tx_info->control.rates[0].idx = 0;
 188         tx_info->control.rates[0].count = 1;
 189         tx_info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
 190         tx_info->control.rates[1].idx = -1;
 191
 192         init_completion(&sc->paprd_complete);
 193         txctl.paprd = BIT(chain);
 194
 195         if (ath_tx_start(hw, skb, &txctl) != 0) {
 196                 ath_dbg(common, CALIBRATE, "PAPRD TX failed\n");
 197                 dev_kfree_skb_any(skb);
 198                 return false;
 199         }
 200
 201         time_left = wait_for_completion_timeout(&sc->paprd_complete,
 202                         msecs_to_jiffies(ATH_PAPRD_TIMEOUT));
 203
 204         if (!time_left)
 205                 ath_dbg(common, CALIBRATE,
 206                         "Timeout waiting for paprd training on TX chain %d\n",
 207                         chain);
 208
 209         return !!time_left;
 210 }
 211
 212 void ath_paprd_calibrate(struct work_struct *work)
 213 {
 214         struct ath_softc *sc = container_of(work, struct ath_softc, paprd_work);
 215         struct ieee80211_hw *hw = sc->hw;
 216         struct ath_hw *ah = sc->sc_ah;
 217         struct ieee80211_hdr *hdr;
 218         struct sk_buff *skb = NULL;
 219         struct ath9k_hw_cal_data *caldata = ah->caldata;
 220         struct ath_common *common = ath9k_hw_common(ah);
 221         int ftype;
 222         int chain_ok = 0;
 223         int chain;
 224         int len = 1800;
 225         int ret;
 226
 227         if (!caldata ||
 228             !test_bit(PAPRD_PACKET_SENT, &caldata->cal_flags) ||
 229             test_bit(PAPRD_DONE, &caldata->cal_flags)) {
 230                 ath_dbg(common, CALIBRATE, "Skipping PAPRD calibration\n");
 231                 return;
 232         }
 233
 234         ath9k_ps_wakeup(sc);
 235
 236         if (ar9003_paprd_init_table(ah) < 0)
 237                 goto fail_paprd;
 238
 239         skb = alloc_skb(len, GFP_KERNEL);
 240         if (!skb)
 241                 goto fail_paprd;
 242
 243         skb_put(skb, len);
 244         memset(skb->data, 0, len);
 245         hdr = (struct ieee80211_hdr *)skb->data;
 246         ftype = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC;
 247         hdr->frame_control = cpu_to_le16(ftype);
 248         hdr->duration_id = cpu_to_le16(10);
 249         memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN);
 250         memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
 251         memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);
 252
 253         for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
 254                 if (!(ah->txchainmask & BIT(chain)))
 255                         continue;
 256
 257                 chain_ok = 0;
 258                 ar9003_paprd_setup_gain_table(ah, chain);
 259
 260                 ath_dbg(common, CALIBRATE,
 261                         "Sending PAPRD training frame on chain %d\n", chain);
 262                 if (!ath_paprd_send_frame(sc, skb, chain))
 263                         goto fail_paprd;
 264
 265                 if (!ar9003_paprd_is_done(ah)) {
 266                         ath_dbg(common, CALIBRATE,
 267                                 "PAPRD not yet done on chain %d\n", chain);
 268                         break;
 269                 }
 270
 271                 ret = ar9003_paprd_create_curve(ah, caldata, chain);
 272                 if (ret == -EINPROGRESS) {
 273                         ath_dbg(common, CALIBRATE,
 274                                 "PAPRD curve on chain %d needs to be re-trained\n",
 275                                 chain);
 276                         break;
 277                 } else if (ret) {
 278                         ath_dbg(common, CALIBRATE,
 279                                 "PAPRD create curve failed on chain %d\n",
 280                                 chain);
 281                         break;
 282                 }
 283
 284                 chain_ok = 1;
 285         }
 286         kfree_skb(skb);
 287
 288         if (chain_ok) {
 289                 set_bit(PAPRD_DONE, &caldata->cal_flags);
 290                 ath_paprd_activate(sc);
 291         }
 292
 293 fail_paprd:
 294         ath9k_ps_restore(sc);
 295 }
 296
 297 /*
 298  *  ANI performs periodic noise floor calibration
 299  *  that is used to adjust and optimize the chip performance.  This
 300  *  takes environmental changes (location, temperature) into account.
 301  *  When the task is complete, it reschedules itself depending on the
 302  *  appropriate interval that was calculated.
 303  */
 304 void ath_ani_calibrate(struct timer_list *t)
 305 {
 306         struct ath_common *common = from_timer(common, t, ani.timer);
 307         struct ath_softc *sc = (struct ath_softc *)common->priv;
 308         struct ath_hw *ah = sc->sc_ah;
 309         bool longcal = false;
 310         bool shortcal = false;
 311         bool aniflag = false;
 312         unsigned int timestamp = jiffies_to_msecs(jiffies);
 313         u32 cal_interval, short_cal_interval, long_cal_interval;
 314         unsigned long flags;
 315
 316         if (ah->caldata && test_bit(NFCAL_INTF, &ah->caldata->cal_flags))
 317                 long_cal_interval = ATH_LONG_CALINTERVAL_INT;
 318         else
 319                 long_cal_interval = ATH_LONG_CALINTERVAL;
 320
 321         short_cal_interval = (ah->opmode == NL80211_IFTYPE_AP) ?
 322                 ATH_AP_SHORT_CALINTERVAL : ATH_STA_SHORT_CALINTERVAL;
 323
 324         /* Only calibrate if awake */
 325         if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE) {
 326                 if (++ah->ani_skip_count >= ATH_ANI_MAX_SKIP_COUNT) {
 327                         spin_lock_irqsave(&sc->sc_pm_lock, flags);
 328                         sc->ps_flags |= PS_WAIT_FOR_ANI;
 329                         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 330                 }
 331                 goto set_timer;
 332         }
 333         ah->ani_skip_count = 0;
 334         spin_lock_irqsave(&sc->sc_pm_lock, flags);
 335         sc->ps_flags &= ~PS_WAIT_FOR_ANI;
 336         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 337
 338         ath9k_ps_wakeup(sc);
 339
 340         /* Long calibration runs independently of short calibration. */
 341         if ((timestamp - common->ani.longcal_timer) >= long_cal_interval) {
 342                 longcal = true;
 343                 common->ani.longcal_timer = timestamp;
 344         }
 345
 346         /* Short calibration applies only while caldone is false */
 347         if (!common->ani.caldone) {
 348                 if ((timestamp - common->ani.shortcal_timer) >= short_cal_interval) {
 349                         shortcal = true;
 350                         common->ani.shortcal_timer = timestamp;
 351                         common->ani.resetcal_timer = timestamp;
 352                 }
 353         } else {
 354                 if ((timestamp - common->ani.resetcal_timer) >=
 355                     ATH_RESTART_CALINTERVAL) {
 356                         common->ani.caldone = ath9k_hw_reset_calvalid(ah);
 357                         if (common->ani.caldone)
 358                                 common->ani.resetcal_timer = timestamp;
 359                 }
 360         }
 361
 362         /* Verify whether we must check ANI */
 363         if ((timestamp - common->ani.checkani_timer) >= ah->config.ani_poll_interval) {
 364                 aniflag = true;
 365                 common->ani.checkani_timer = timestamp;
 366         }
 367
 368         /* Call ANI routine if necessary */
 369         if (aniflag) {
 370                 spin_lock_irqsave(&common->cc_lock, flags);
 371                 ath9k_hw_ani_monitor(ah, ah->curchan);
 372                 ath_update_survey_stats(sc);
 373                 spin_unlock_irqrestore(&common->cc_lock, flags);
 374         }
 375
 376         /* Perform calibration if necessary */
 377         if (longcal || shortcal) {
 378                 int ret = ath9k_hw_calibrate(ah, ah->curchan, ah->rxchainmask,
 379                                              longcal);
 380                 if (ret < 0) {
 381                         common->ani.caldone = 0;
 382                         ath9k_queue_reset(sc, RESET_TYPE_CALIBRATION);
 383                         return;
 384                 }
 385
 386                 common->ani.caldone = ret;
 387         }
 388
 389         ath_dbg(common, ANI,
 390                 "Calibration @%lu finished: %s %s %s, caldone: %s\n",
 391                 jiffies,
 392                 longcal ? "long" : "", shortcal ? "short" : "",
 393                 aniflag ? "ani" : "", common->ani.caldone ? "true" : "false");
 394
 395         ath9k_ps_restore(sc);
 396
 397 set_timer:
 398         /*
 399         * Set timer interval based on previous results.
 400         * The interval must be the shortest necessary to satisfy ANI,
 401         * short calibration and long calibration.
 402         */
 403         cal_interval = ATH_LONG_CALINTERVAL;
 404         cal_interval = min(cal_interval, (u32)ah->config.ani_poll_interval);
 405         if (!common->ani.caldone)
 406                 cal_interval = min(cal_interval, (u32)short_cal_interval);
 407
 408         mod_timer(&common->ani.timer, jiffies + msecs_to_jiffies(cal_interval));
 409
 410         if (ar9003_is_paprd_enabled(ah) && ah->caldata) {
 411                 if (!test_bit(PAPRD_DONE, &ah->caldata->cal_flags)) {
 412                         ieee80211_queue_work(sc->hw, &sc->paprd_work);
 413                 } else if (!ah->paprd_table_write_done) {
 414                         ath9k_ps_wakeup(sc);
 415                         ath_paprd_activate(sc);
 416                         ath9k_ps_restore(sc);
 417                 }
 418         }
 419 }
 420
 421 void ath_start_ani(struct ath_softc *sc)
 422 {
 423         struct ath_hw *ah = sc->sc_ah;
 424         struct ath_common *common = ath9k_hw_common(ah);
 425         unsigned long timestamp = jiffies_to_msecs(jiffies);
 426
 427         if (common->disable_ani ||
 428             !test_bit(ATH_OP_ANI_RUN, &common->op_flags) ||
 429             sc->cur_chan->offchannel)
 430                 return;
 431
 432         common->ani.longcal_timer = timestamp;
 433         common->ani.shortcal_timer = timestamp;
 434         common->ani.checkani_timer = timestamp;
 435
 436         ath_dbg(common, ANI, "Starting ANI\n");
 437         mod_timer(&common->ani.timer,
 438                   jiffies + msecs_to_jiffies((u32)ah->config.ani_poll_interval));
 439 }
 440
 441 void ath_stop_ani(struct ath_softc *sc)
 442 {
 443         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 444
 445         ath_dbg(common, ANI, "Stopping ANI\n");
 446         del_timer_sync(&common->ani.timer);
 447 }
 448
 449 void ath_check_ani(struct ath_softc *sc)
 450 {
 451         struct ath_hw *ah = sc->sc_ah;
 452         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 453         struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
 454
 455         /*
 456          * Check for the various conditions in which ANI has to
 457          * be stopped.
 458          */
 459         if (ah->opmode == NL80211_IFTYPE_ADHOC) {
 460                 if (!cur_conf->enable_beacon)
 461                         goto stop_ani;
 462         } else if (ah->opmode == NL80211_IFTYPE_AP) {
 463                 if (!cur_conf->enable_beacon) {
 464                         /*
 465                          * Disable ANI only when there are no
 466                          * associated stations.
 467                          */
 468                         if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags))
 469                                 goto stop_ani;
 470                 }
 471         } else if (ah->opmode == NL80211_IFTYPE_STATION) {
 472                 if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags))
 473                         goto stop_ani;
 474         }
 475
 476         if (!test_bit(ATH_OP_ANI_RUN, &common->op_flags)) {
 477                 set_bit(ATH_OP_ANI_RUN, &common->op_flags);
 478                 ath_start_ani(sc);
 479         }
 480
 481         return;
 482
 483 stop_ani:
 484         clear_bit(ATH_OP_ANI_RUN, &common->op_flags);
 485         ath_stop_ani(sc);
 486 }
 487
 488 void ath_update_survey_nf(struct ath_softc *sc, int channel)
 489 {
 490         struct ath_hw *ah = sc->sc_ah;
 491         struct ath9k_channel *chan = &ah->channels[channel];
 492         struct survey_info *survey = &sc->survey[channel];
 493
 494         if (chan->noisefloor) {
 495                 survey->filled |= SURVEY_INFO_NOISE_DBM;
 496                 survey->noise = ath9k_hw_getchan_noise(ah, chan,
 497                                                        chan->noisefloor);
 498         }
 499 }
 500
 501 /*
 502  * Updates the survey statistics and returns the busy time since last
 503  * update in %, if the measurement duration was long enough for the
 504  * result to be useful, -1 otherwise.
 505  */
 506 int ath_update_survey_stats(struct ath_softc *sc)
 507 {
 508         struct ath_hw *ah = sc->sc_ah;
 509         struct ath_common *common = ath9k_hw_common(ah);
 510         int pos = ah->curchan - &ah->channels[0];
 511         struct survey_info *survey = &sc->survey[pos];
 512         struct ath_cycle_counters *cc = &common->cc_survey;
 513         unsigned int div = common->clockrate * 1000;
 514         int ret = 0;
 515
 516         if (!ah->curchan)
 517                 return -1;
 518
 519         if (ah->power_mode == ATH9K_PM_AWAKE)
 520                 ath_hw_cycle_counters_update(common);
 521
 522         if (cc->cycles > 0) {
 523                 survey->filled |= SURVEY_INFO_TIME |
 524                         SURVEY_INFO_TIME_BUSY |
 525                         SURVEY_INFO_TIME_RX |
 526                         SURVEY_INFO_TIME_TX;
 527                 survey->time += cc->cycles / div;
 528                 survey->time_busy += cc->rx_busy / div;
 529                 survey->time_rx += cc->rx_frame / div;
 530                 survey->time_tx += cc->tx_frame / div;
 531         }
 532
 533         if (cc->cycles < div)
 534                 return -1;
 535
 536         if (cc->cycles > 0)
 537                 ret = cc->rx_busy * 100 / cc->cycles;
 538
 539         memset(cc, 0, sizeof(*cc));
 540
 541         ath_update_survey_nf(sc, pos);
 542
 543         return ret;
 544 }