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 #ifdef CONFIG_ATH9K_DEBUGFS
  31         sc->tx_complete_poll_work_seen++;
  32 #endif
  33
  34         for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++)
  35                 if (ATH_TXQ_SETUP(sc, i)) {
  36                         txq = &sc->tx.txq[i];
  37                         ath_txq_lock(sc, txq);
  38                         if (txq->axq_depth) {
  39                                 if (txq->axq_tx_inprogress) {
  40                                         needreset = true;
  41                                         ath_txq_unlock(sc, txq);
  42                                         break;
  43                                 } else {
  44                                         txq->axq_tx_inprogress = true;
  45                                 }
  46                         }
  47                         ath_txq_unlock_complete(sc, txq);
  48                 }
  49
  50         if (needreset) {
  51                 ath_dbg(ath9k_hw_common(sc->sc_ah), RESET,
  52                         "tx hung, resetting the chip\n");
  53                 ath9k_queue_reset(sc, RESET_TYPE_TX_HANG);
  54                 return;
  55         }
  56
  57         ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work,
  58                                      msecs_to_jiffies(ATH_TX_COMPLETE_POLL_INT));
  59 }
  60
  61 /*
  62  * Checks if the BB/MAC is hung.
  63  */
  64 void ath_hw_check(struct work_struct *work)
  65 {
  66         struct ath_softc *sc = container_of(work, struct ath_softc, hw_check_work);
  67         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  68         unsigned long flags;
  69         int busy;
  70         u8 is_alive, nbeacon = 1;
  71         enum ath_reset_type type;
  72
  73         ath9k_ps_wakeup(sc);
  74         is_alive = ath9k_hw_check_alive(sc->sc_ah);
  75
  76         if (is_alive && !AR_SREV_9300(sc->sc_ah))
  77                 goto out;
  78         else if (!is_alive && AR_SREV_9300(sc->sc_ah)) {
  79                 ath_dbg(common, RESET,
  80                         "DCU stuck is detected. Schedule chip reset\n");
  81                 type = RESET_TYPE_MAC_HANG;
  82                 goto sched_reset;
  83         }
  84
  85         spin_lock_irqsave(&common->cc_lock, flags);
  86         busy = ath_update_survey_stats(sc);
  87         spin_unlock_irqrestore(&common->cc_lock, flags);
  88
  89         ath_dbg(common, RESET, "Possible baseband hang, busy=%d (try %d)\n",
  90                 busy, sc->hw_busy_count + 1);
  91         if (busy >= 99) {
  92                 if (++sc->hw_busy_count >= 3) {
  93                         type = RESET_TYPE_BB_HANG;
  94                         goto sched_reset;
  95                 }
  96         } else if (busy >= 0) {
  97                 sc->hw_busy_count = 0;
  98                 nbeacon = 3;
  99         }
 100
 101         ath_start_rx_poll(sc, nbeacon);
 102         goto out;
 103
 104 sched_reset:
 105         ath9k_queue_reset(sc, type);
 106 out:
 107         ath9k_ps_restore(sc);
 108 }
 109
 110 /*
 111  * PLL-WAR for AR9485/AR9340
 112  */
 113 static bool ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum)
 114 {
 115         static int count;
 116         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 117
 118         if (pll_sqsum >= 0x40000) {
 119                 count++;
 120                 if (count == 3) {
 121                         ath_dbg(common, RESET, "PLL WAR, resetting the chip\n");
 122                         ath9k_queue_reset(sc, RESET_TYPE_PLL_HANG);
 123                         count = 0;
 124                         return true;
 125                 }
 126         } else {
 127                 count = 0;
 128         }
 129
 130         return false;
 131 }
 132
 133 void ath_hw_pll_work(struct work_struct *work)
 134 {
 135         u32 pll_sqsum;
 136         struct ath_softc *sc = container_of(work, struct ath_softc,
 137                                             hw_pll_work.work);
 138         /*
 139          * ensure that the PLL WAR is executed only
 140          * after the STA is associated (or) if the
 141          * beaconing had started in interfaces that
 142          * uses beacons.
 143          */
 144         if (!test_bit(SC_OP_BEACONS, &sc->sc_flags))
 145                 return;
 146
 147         ath9k_ps_wakeup(sc);
 148         pll_sqsum = ar9003_get_pll_sqsum_dvc(sc->sc_ah);
 149         ath9k_ps_restore(sc);
 150         if (ath_hw_pll_rx_hang_check(sc, pll_sqsum))
 151                 return;
 152
 153         ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work,
 154                                      msecs_to_jiffies(ATH_PLL_WORK_INTERVAL));
 155 }
 156
 157 /*
 158  * RX Polling - monitors baseband hangs.
 159  */
 160 void ath_start_rx_poll(struct ath_softc *sc, u8 nbeacon)
 161 {
 162         if (!AR_SREV_9300(sc->sc_ah))
 163                 return;
 164
 165         if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags))
 166                 return;
 167
 168         mod_timer(&sc->rx_poll_timer, jiffies + msecs_to_jiffies
 169                   (nbeacon * sc->cur_beacon_conf.beacon_interval));
 170 }
 171
 172 void ath_rx_poll(unsigned long data)
 173 {
 174         struct ath_softc *sc = (struct ath_softc *)data;
 175
 176         ieee80211_queue_work(sc->hw, &sc->hw_check_work);
 177 }
 178
 179 /*
 180  * PA Pre-distortion.
 181  */
 182 static void ath_paprd_activate(struct ath_softc *sc)
 183 {
 184         struct ath_hw *ah = sc->sc_ah;
 185         struct ath9k_hw_cal_data *caldata = ah->caldata;
 186         int chain;
 187
 188         if (!caldata || !caldata->paprd_done)
 189                 return;
 190
 191         ath9k_ps_wakeup(sc);
 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         ar9003_paprd_enable(ah, true);
 201         ath9k_ps_restore(sc);
 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[WME_AC_BE];
 215
 216         memset(tx_info, 0, sizeof(*tx_info));
 217         tx_info->band = hw->conf.channel->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 || !caldata->paprd_packet_sent || caldata->paprd_done)
 260                 return;
 261
 262         ath9k_ps_wakeup(sc);
 263
 264         if (ar9003_paprd_init_table(ah) < 0)
 265                 goto fail_paprd;
 266
 267         skb = alloc_skb(len, GFP_KERNEL);
 268         if (!skb)
 269                 goto fail_paprd;
 270
 271         skb_put(skb, len);
 272         memset(skb->data, 0, len);
 273         hdr = (struct ieee80211_hdr *)skb->data;
 274         ftype = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC;
 275         hdr->frame_control = cpu_to_le16(ftype);
 276         hdr->duration_id = cpu_to_le16(10);
 277         memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN);
 278         memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
 279         memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);
 280
 281         for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
 282                 if (!(ah->txchainmask & BIT(chain)))
 283                         continue;
 284
 285                 chain_ok = 0;
 286                 ar9003_paprd_setup_gain_table(ah, chain);
 287
 288                 ath_dbg(common, CALIBRATE,
 289                         "Sending PAPRD training frame on chain %d\n", chain);
 290                 if (!ath_paprd_send_frame(sc, skb, chain))
 291                         goto fail_paprd;
 292
 293                 if (!ar9003_paprd_is_done(ah)) {
 294                         ath_dbg(common, CALIBRATE,
 295                                 "PAPRD not yet done on chain %d\n", chain);
 296                         break;
 297                 }
 298
 299                 ret = ar9003_paprd_create_curve(ah, caldata, chain);
 300                 if (ret == -EINPROGRESS) {
 301                         ath_dbg(common, CALIBRATE,
 302                                 "PAPRD curve on chain %d needs to be re-trained\n",
 303                                 chain);
 304                         break;
 305                 } else if (ret) {
 306                         ath_dbg(common, CALIBRATE,
 307                                 "PAPRD create curve failed on chain %d\n",
 308                                 chain);
 309                         break;
 310                 }
 311
 312                 chain_ok = 1;
 313         }
 314         kfree_skb(skb);
 315
 316         if (chain_ok) {
 317                 caldata->paprd_done = true;
 318                 ath_paprd_activate(sc);
 319         }
 320
 321 fail_paprd:
 322         ath9k_ps_restore(sc);
 323 }
 324
 325 /*
 326  *  ANI performs periodic noise floor calibration
 327  *  that is used to adjust and optimize the chip performance.  This
 328  *  takes environmental changes (location, temperature) into account.
 329  *  When the task is complete, it reschedules itself depending on the
 330  *  appropriate interval that was calculated.
 331  */
 332 void ath_ani_calibrate(unsigned long data)
 333 {
 334         struct ath_softc *sc = (struct ath_softc *)data;
 335         struct ath_hw *ah = sc->sc_ah;
 336         struct ath_common *common = ath9k_hw_common(ah);
 337         bool longcal = false;
 338         bool shortcal = false;
 339         bool aniflag = false;
 340         unsigned int timestamp = jiffies_to_msecs(jiffies);
 341         u32 cal_interval, short_cal_interval, long_cal_interval;
 342         unsigned long flags;
 343
 344         if (ah->caldata && ah->caldata->nfcal_interference)
 345                 long_cal_interval = ATH_LONG_CALINTERVAL_INT;
 346         else
 347                 long_cal_interval = ATH_LONG_CALINTERVAL;
 348
 349         short_cal_interval = (ah->opmode == NL80211_IFTYPE_AP) ?
 350                 ATH_AP_SHORT_CALINTERVAL : ATH_STA_SHORT_CALINTERVAL;
 351
 352         /* Only calibrate if awake */
 353         if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE)
 354                 goto set_timer;
 355
 356         ath9k_ps_wakeup(sc);
 357
 358         /* Long calibration runs independently of short calibration. */
 359         if ((timestamp - common->ani.longcal_timer) >= long_cal_interval) {
 360                 longcal = true;
 361                 common->ani.longcal_timer = timestamp;
 362         }
 363
 364         /* Short calibration applies only while caldone is false */
 365         if (!common->ani.caldone) {
 366                 if ((timestamp - common->ani.shortcal_timer) >= short_cal_interval) {
 367                         shortcal = true;
 368                         common->ani.shortcal_timer = timestamp;
 369                         common->ani.resetcal_timer = timestamp;
 370                 }
 371         } else {
 372                 if ((timestamp - common->ani.resetcal_timer) >=
 373                     ATH_RESTART_CALINTERVAL) {
 374                         common->ani.caldone = ath9k_hw_reset_calvalid(ah);
 375                         if (common->ani.caldone)
 376                                 common->ani.resetcal_timer = timestamp;
 377                 }
 378         }
 379
 380         /* Verify whether we must check ANI */
 381         if (sc->sc_ah->config.enable_ani
 382             && (timestamp - common->ani.checkani_timer) >=
 383             ah->config.ani_poll_interval) {
 384                 aniflag = true;
 385                 common->ani.checkani_timer = timestamp;
 386         }
 387
 388         /* Call ANI routine if necessary */
 389         if (aniflag) {
 390                 spin_lock_irqsave(&common->cc_lock, flags);
 391                 ath9k_hw_ani_monitor(ah, ah->curchan);
 392                 ath_update_survey_stats(sc);
 393                 spin_unlock_irqrestore(&common->cc_lock, flags);
 394         }
 395
 396         /* Perform calibration if necessary */
 397         if (longcal || shortcal) {
 398                 common->ani.caldone =
 399                         ath9k_hw_calibrate(ah, ah->curchan,
 400                                            ah->rxchainmask, longcal);
 401         }
 402
 403         ath_dbg(common, ANI,
 404                 "Calibration @%lu finished: %s %s %s, caldone: %s\n",
 405                 jiffies,
 406                 longcal ? "long" : "", shortcal ? "short" : "",
 407                 aniflag ? "ani" : "", common->ani.caldone ? "true" : "false");
 408
 409         ath9k_debug_samp_bb_mac(sc);
 410         ath9k_ps_restore(sc);
 411
 412 set_timer:
 413         /*
 414         * Set timer interval based on previous results.
 415         * The interval must be the shortest necessary to satisfy ANI,
 416         * short calibration and long calibration.
 417         */
 418         cal_interval = ATH_LONG_CALINTERVAL;
 419         if (sc->sc_ah->config.enable_ani)
 420                 cal_interval = min(cal_interval,
 421                                    (u32)ah->config.ani_poll_interval);
 422         if (!common->ani.caldone)
 423                 cal_interval = min(cal_interval, (u32)short_cal_interval);
 424
 425         mod_timer(&common->ani.timer, jiffies + msecs_to_jiffies(cal_interval));
 426         if (ah->eep_ops->get_eeprom(ah, EEP_PAPRD) && ah->caldata) {
 427                 if (!ah->caldata->paprd_done)
 428                         ieee80211_queue_work(sc->hw, &sc->paprd_work);
 429                 else if (!ah->paprd_table_write_done)
 430                         ath_paprd_activate(sc);
 431         }
 432 }
 433
 434 void ath_start_ani(struct ath_softc *sc)
 435 {
 436         struct ath_hw *ah = sc->sc_ah;
 437         struct ath_common *common = ath9k_hw_common(ah);
 438         unsigned long timestamp = jiffies_to_msecs(jiffies);
 439
 440         if (common->disable_ani ||
 441             !test_bit(SC_OP_ANI_RUN, &sc->sc_flags) ||
 442             (sc->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL))
 443                 return;
 444
 445         common->ani.longcal_timer = timestamp;
 446         common->ani.shortcal_timer = timestamp;
 447         common->ani.checkani_timer = timestamp;
 448
 449         ath_dbg(common, ANI, "Starting ANI\n");
 450         mod_timer(&common->ani.timer,
 451                   jiffies + msecs_to_jiffies((u32)ah->config.ani_poll_interval));
 452 }
 453
 454 void ath_stop_ani(struct ath_softc *sc)
 455 {
 456         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 457
 458         ath_dbg(common, ANI, "Stopping ANI\n");
 459         del_timer_sync(&common->ani.timer);
 460 }
 461
 462 void ath_check_ani(struct ath_softc *sc)
 463 {
 464         struct ath_hw *ah = sc->sc_ah;
 465         struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
 466
 467         /*
 468          * Check for the various conditions in which ANI has to
 469          * be stopped.
 470          */
 471         if (ah->opmode == NL80211_IFTYPE_ADHOC) {
 472                 if (!cur_conf->enable_beacon)
 473                         goto stop_ani;
 474         } else if (ah->opmode == NL80211_IFTYPE_AP) {
 475                 if (!cur_conf->enable_beacon) {
 476                         /*
 477                          * Disable ANI only when there are no
 478                          * associated stations.
 479                          */
 480                         if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags))
 481                                 goto stop_ani;
 482                 }
 483         } else if (ah->opmode == NL80211_IFTYPE_STATION) {
 484                 if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags))
 485                         goto stop_ani;
 486         }
 487
 488         if (!test_bit(SC_OP_ANI_RUN, &sc->sc_flags)) {
 489                 set_bit(SC_OP_ANI_RUN, &sc->sc_flags);
 490                 ath_start_ani(sc);
 491         }
 492
 493         return;
 494
 495 stop_ani:
 496         clear_bit(SC_OP_ANI_RUN, &sc->sc_flags);
 497         ath_stop_ani(sc);
 498 }
 499
 500 void ath_update_survey_nf(struct ath_softc *sc, int channel)
 501 {
 502         struct ath_hw *ah = sc->sc_ah;
 503         struct ath9k_channel *chan = &ah->channels[channel];
 504         struct survey_info *survey = &sc->survey[channel];
 505
 506         if (chan->noisefloor) {
 507                 survey->filled |= SURVEY_INFO_NOISE_DBM;
 508                 survey->noise = ath9k_hw_getchan_noise(ah, chan);
 509         }
 510 }
 511
 512 /*
 513  * Updates the survey statistics and returns the busy time since last
 514  * update in %, if the measurement duration was long enough for the
 515  * result to be useful, -1 otherwise.
 516  */
 517 int ath_update_survey_stats(struct ath_softc *sc)
 518 {
 519         struct ath_hw *ah = sc->sc_ah;
 520         struct ath_common *common = ath9k_hw_common(ah);
 521         int pos = ah->curchan - &ah->channels[0];
 522         struct survey_info *survey = &sc->survey[pos];
 523         struct ath_cycle_counters *cc = &common->cc_survey;
 524         unsigned int div = common->clockrate * 1000;
 525         int ret = 0;
 526
 527         if (!ah->curchan)
 528                 return -1;
 529
 530         if (ah->power_mode == ATH9K_PM_AWAKE)
 531                 ath_hw_cycle_counters_update(common);
 532
 533         if (cc->cycles > 0) {
 534                 survey->filled |= SURVEY_INFO_CHANNEL_TIME |
 535                         SURVEY_INFO_CHANNEL_TIME_BUSY |
 536                         SURVEY_INFO_CHANNEL_TIME_RX |
 537                         SURVEY_INFO_CHANNEL_TIME_TX;
 538                 survey->channel_time += cc->cycles / div;
 539                 survey->channel_time_busy += cc->rx_busy / div;
 540                 survey->channel_time_rx += cc->rx_frame / div;
 541                 survey->channel_time_tx += cc->tx_frame / div;
 542         }
 543
 544         if (cc->cycles < div)
 545                 return -1;
 546
 547         if (cc->cycles > 0)
 548                 ret = cc->rx_busy * 100 / cc->cycles;
 549
 550         memset(cc, 0, sizeof(*cc));
 551
 552         ath_update_survey_nf(sc, pos);
 553
 554         return ret;
 555 }