drivers/net/wireless/ath/ath9k/gpio.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 "ath9k.h"
  18
  19 /********************************/
  20 /*       LED functions          */
  21 /********************************/
  22
  23 #ifdef CONFIG_MAC80211_LEDS
  24 static void ath_led_brightness(struct led_classdev *led_cdev,
  25                                enum led_brightness brightness)
  26 {
  27         struct ath_softc *sc = container_of(led_cdev, struct ath_softc, led_cdev);
  28         u32 val = (brightness == LED_OFF);
  29
  30         if (sc->sc_ah->config.led_active_high)
  31                 val = !val;
  32
  33         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, val);
  34 }
  35
  36 void ath_deinit_leds(struct ath_softc *sc)
  37 {
  38         if (!sc->led_registered)
  39                 return;
  40
  41         ath_led_brightness(&sc->led_cdev, LED_OFF);
  42         led_classdev_unregister(&sc->led_cdev);
  43 }
  44
  45 void ath_init_leds(struct ath_softc *sc)
  46 {
  47         int ret;
  48
  49         if (AR_SREV_9100(sc->sc_ah))
  50                 return;
  51
  52         if (!led_blink)
  53                 sc->led_cdev.default_trigger =
  54                         ieee80211_get_radio_led_name(sc->hw);
  55
  56         snprintf(sc->led_name, sizeof(sc->led_name),
  57                 "ath9k-%s", wiphy_name(sc->hw->wiphy));
  58         sc->led_cdev.name = sc->led_name;
  59         sc->led_cdev.brightness_set = ath_led_brightness;
  60
  61         ret = led_classdev_register(wiphy_dev(sc->hw->wiphy), &sc->led_cdev);
  62         if (ret < 0)
  63                 return;
  64
  65         sc->led_registered = true;
  66 }
  67
  68 void ath_fill_led_pin(struct ath_softc *sc)
  69 {
  70         struct ath_hw *ah = sc->sc_ah;
  71
  72         if (AR_SREV_9100(ah) || (ah->led_pin >= 0))
  73                 return;
  74
  75         if (AR_SREV_9287(ah))
  76                 ah->led_pin = ATH_LED_PIN_9287;
  77         else if (AR_SREV_9485(sc->sc_ah))
  78                 ah->led_pin = ATH_LED_PIN_9485;
  79         else if (AR_SREV_9300(sc->sc_ah))
  80                 ah->led_pin = ATH_LED_PIN_9300;
  81         else if (AR_SREV_9462(sc->sc_ah) || AR_SREV_9565(sc->sc_ah))
  82                 ah->led_pin = ATH_LED_PIN_9462;
  83         else
  84                 ah->led_pin = ATH_LED_PIN_DEF;
  85
  86         /* Configure gpio 1 for output */
  87         ath9k_hw_cfg_output(ah, ah->led_pin, AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
  88
  89         /* LED off, active low */
  90         ath9k_hw_set_gpio(ah, ah->led_pin, (ah->config.led_active_high) ? 0 : 1);
  91 }
  92 #endif
  93
  94 /*******************/
  95 /*      Rfkill     */
  96 /*******************/
  97
  98 static bool ath_is_rfkill_set(struct ath_softc *sc)
  99 {
 100         struct ath_hw *ah = sc->sc_ah;
 101         bool is_blocked;
 102
 103         ath9k_ps_wakeup(sc);
 104         is_blocked = ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
 105                                   ah->rfkill_polarity;
 106         ath9k_ps_restore(sc);
 107
 108         return is_blocked;
 109 }
 110
 111 void ath9k_rfkill_poll_state(struct ieee80211_hw *hw)
 112 {
 113         struct ath_softc *sc = hw->priv;
 114         bool blocked = !!ath_is_rfkill_set(sc);
 115
 116         wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
 117 }
 118
 119 void ath_start_rfkill_poll(struct ath_softc *sc)
 120 {
 121         struct ath_hw *ah = sc->sc_ah;
 122
 123         if (ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 124                 wiphy_rfkill_start_polling(sc->hw->wiphy);
 125 }
 126
 127 #ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
 128
 129 /******************/
 130 /*     BTCOEX     */
 131 /******************/
 132
 133 /*
 134  * Detects if there is any priority bt traffic
 135  */
 136 static void ath_detect_bt_priority(struct ath_softc *sc)
 137 {
 138         struct ath_btcoex *btcoex = &sc->btcoex;
 139         struct ath_hw *ah = sc->sc_ah;
 140
 141         if (ath9k_hw_gpio_get(sc->sc_ah, ah->btcoex_hw.btpriority_gpio))
 142                 btcoex->bt_priority_cnt++;
 143
 144         if (time_after(jiffies, btcoex->bt_priority_time +
 145                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
 146                 clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 147                 clear_bit(BT_OP_SCAN, &btcoex->op_flags);
 148                 /* Detect if colocated bt started scanning */
 149                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 150                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 151                                 "BT scan detected\n");
 152                         set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 153                         set_bit(BT_OP_SCAN, &btcoex->op_flags);
 154                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 155                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 156                                 "BT priority traffic detected\n");
 157                         set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 158                 }
 159
 160                 btcoex->bt_priority_cnt = 0;
 161                 btcoex->bt_priority_time = jiffies;
 162         }
 163 }
 164
 165 static void ath_mci_ftp_adjust(struct ath_softc *sc)
 166 {
 167         struct ath_btcoex *btcoex = &sc->btcoex;
 168         struct ath_mci_profile *mci = &btcoex->mci;
 169         struct ath_hw *ah = sc->sc_ah;
 170
 171         if (btcoex->bt_wait_time > ATH_BTCOEX_RX_WAIT_TIME) {
 172                 if (ar9003_mci_state(ah, MCI_STATE_NEED_FTP_STOMP) &&
 173                     (mci->num_pan || mci->num_other_acl))
 174                         ah->btcoex_hw.mci.stomp_ftp =
 175                                 (sc->rx.num_pkts < ATH_BTCOEX_STOMP_FTP_THRESH);
 176                 else
 177                         ah->btcoex_hw.mci.stomp_ftp = false;
 178                 btcoex->bt_wait_time = 0;
 179                 sc->rx.num_pkts = 0;
 180         }
 181 }
 182
 183 /*
 184  * This is the master bt coex timer which runs for every
 185  * 45ms, bt traffic will be given priority during 55% of this
 186  * period while wlan gets remaining 45%
 187  */
 188 static void ath_btcoex_period_timer(unsigned long data)
 189 {
 190         struct ath_softc *sc = (struct ath_softc *) data;
 191         struct ath_hw *ah = sc->sc_ah;
 192         struct ath_btcoex *btcoex = &sc->btcoex;
 193         enum ath_stomp_type stomp_type;
 194         u32 timer_period;
 195         unsigned long flags;
 196
 197         spin_lock_irqsave(&sc->sc_pm_lock, flags);
 198         if (sc->sc_ah->power_mode == ATH9K_PM_NETWORK_SLEEP) {
 199                 btcoex->bt_wait_time += btcoex->btcoex_period;
 200                 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 201                 goto skip_hw_wakeup;
 202         }
 203         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 204
 205         ath9k_mci_update_rssi(sc);
 206
 207         ath9k_ps_wakeup(sc);
 208
 209         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 210                 ath_detect_bt_priority(sc);
 211
 212         if (ah->caps.hw_caps & ATH9K_HW_CAP_MCI)
 213                 ath_mci_ftp_adjust(sc);
 214
 215         spin_lock_bh(&btcoex->btcoex_lock);
 216
 217         stomp_type = btcoex->bt_stomp_type;
 218         timer_period = btcoex->btcoex_no_stomp;
 219
 220         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI)) {
 221                 if (test_bit(BT_OP_SCAN, &btcoex->op_flags)) {
 222                         stomp_type = ATH_BTCOEX_STOMP_ALL;
 223                         timer_period = btcoex->btscan_no_stomp;
 224                 }
 225         } else if (btcoex->stomp_audio >= 5) {
 226                 stomp_type = ATH_BTCOEX_STOMP_AUDIO;
 227                 btcoex->stomp_audio = 0;
 228         }
 229
 230         ath9k_hw_btcoex_bt_stomp(ah, stomp_type);
 231         ath9k_hw_btcoex_enable(ah);
 232
 233         spin_unlock_bh(&btcoex->btcoex_lock);
 234
 235         if (btcoex->btcoex_period != btcoex->btcoex_no_stomp)
 236                 mod_timer(&btcoex->no_stomp_timer,
 237                          jiffies + msecs_to_jiffies(timer_period));
 238
 239         ath9k_ps_restore(sc);
 240
 241 skip_hw_wakeup:
 242         mod_timer(&btcoex->period_timer,
 243                   jiffies + msecs_to_jiffies(btcoex->btcoex_period));
 244 }
 245
 246 /*
 247  * Generic tsf based hw timer which configures weight
 248  * registers to time slice between wlan and bt traffic
 249  */
 250 static void ath_btcoex_no_stomp_timer(unsigned long arg)
 251 {
 252         struct ath_softc *sc = (struct ath_softc *)arg;
 253         struct ath_hw *ah = sc->sc_ah;
 254         struct ath_btcoex *btcoex = &sc->btcoex;
 255         struct ath_common *common = ath9k_hw_common(ah);
 256
 257         ath_dbg(common, BTCOEX, "no stomp timer running\n");
 258
 259         ath9k_ps_wakeup(sc);
 260         spin_lock_bh(&btcoex->btcoex_lock);
 261
 262         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW ||
 263             (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI) &&
 264              test_bit(BT_OP_SCAN, &btcoex->op_flags)))
 265                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 266         else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 267                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 268
 269         ath9k_hw_btcoex_enable(ah);
 270         spin_unlock_bh(&btcoex->btcoex_lock);
 271         ath9k_ps_restore(sc);
 272 }
 273
 274 static int ath_init_btcoex_timer(struct ath_softc *sc)
 275 {
 276         struct ath_btcoex *btcoex = &sc->btcoex;
 277
 278         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
 279         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 280                 btcoex->btcoex_period / 100;
 281         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 282                                    btcoex->btcoex_period / 100;
 283
 284         setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 285                         (unsigned long) sc);
 286         setup_timer(&btcoex->no_stomp_timer, ath_btcoex_no_stomp_timer,
 287                         (unsigned long) sc);
 288
 289         spin_lock_init(&btcoex->btcoex_lock);
 290
 291         return 0;
 292 }
 293
 294 /*
 295  * (Re)start btcoex timers
 296  */
 297 void ath9k_btcoex_timer_resume(struct ath_softc *sc)
 298 {
 299         struct ath_btcoex *btcoex = &sc->btcoex;
 300         struct ath_hw *ah = sc->sc_ah;
 301
 302         ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex timers\n");
 303
 304         /* make sure duty cycle timer is also stopped when resuming */
 305         del_timer_sync(&btcoex->no_stomp_timer);
 306
 307         btcoex->bt_priority_cnt = 0;
 308         btcoex->bt_priority_time = jiffies;
 309         clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 310         clear_bit(BT_OP_SCAN, &btcoex->op_flags);
 311
 312         mod_timer(&btcoex->period_timer, jiffies);
 313 }
 314
 315
 316 /*
 317  * Pause btcoex timer and bt duty cycle timer
 318  */
 319 void ath9k_btcoex_timer_pause(struct ath_softc *sc)
 320 {
 321         struct ath_btcoex *btcoex = &sc->btcoex;
 322
 323         del_timer_sync(&btcoex->period_timer);
 324         del_timer_sync(&btcoex->no_stomp_timer);
 325 }
 326
 327 void ath9k_btcoex_stop_gen_timer(struct ath_softc *sc)
 328 {
 329         struct ath_btcoex *btcoex = &sc->btcoex;
 330
 331         del_timer_sync(&btcoex->no_stomp_timer);
 332 }
 333
 334 u16 ath9k_btcoex_aggr_limit(struct ath_softc *sc, u32 max_4ms_framelen)
 335 {
 336         struct ath_btcoex *btcoex = &sc->btcoex;
 337         struct ath_mci_profile *mci = &sc->btcoex.mci;
 338         u16 aggr_limit = 0;
 339
 340         if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI) && mci->aggr_limit)
 341                 aggr_limit = (max_4ms_framelen * mci->aggr_limit) >> 4;
 342         else if (test_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags))
 343                 aggr_limit = min((max_4ms_framelen * 3) / 8,
 344                                  (u32)ATH_AMPDU_LIMIT_MAX);
 345
 346         return aggr_limit;
 347 }
 348
 349 void ath9k_btcoex_handle_interrupt(struct ath_softc *sc, u32 status)
 350 {
 351         if (status & ATH9K_INT_MCI)
 352                 ath_mci_intr(sc);
 353 }
 354
 355 void ath9k_start_btcoex(struct ath_softc *sc)
 356 {
 357         struct ath_hw *ah = sc->sc_ah;
 358
 359         if ((ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) &&
 360             !ah->btcoex_hw.enabled) {
 361                 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 362                         ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 363                                                    AR_STOMP_LOW_WLAN_WGHT, 0);
 364                 else
 365                         ath9k_hw_btcoex_set_weight(ah, 0, 0,
 366                                                    ATH_BTCOEX_STOMP_NONE);
 367                 ath9k_hw_btcoex_enable(ah);
 368
 369                 if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 370                         ath9k_btcoex_timer_resume(sc);
 371         }
 372 }
 373
 374 void ath9k_stop_btcoex(struct ath_softc *sc)
 375 {
 376         struct ath_hw *ah = sc->sc_ah;
 377
 378         if (ah->btcoex_hw.enabled &&
 379             ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) {
 380                 if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 381                         ath9k_btcoex_timer_pause(sc);
 382                 ath9k_hw_btcoex_disable(ah);
 383                 if (AR_SREV_9462(ah) || AR_SREV_9565(ah))
 384                         ath_mci_flush_profile(&sc->btcoex.mci);
 385         }
 386 }
 387
 388 void ath9k_deinit_btcoex(struct ath_softc *sc)
 389 {
 390         struct ath_hw *ah = sc->sc_ah;
 391
 392         if (ath9k_hw_mci_is_enabled(ah))
 393                 ath_mci_cleanup(sc);
 394 }
 395
 396 int ath9k_init_btcoex(struct ath_softc *sc)
 397 {
 398         struct ath_txq *txq;
 399         struct ath_hw *ah = sc->sc_ah;
 400         int r;
 401
 402         ath9k_hw_btcoex_init_scheme(ah);
 403
 404         switch (ath9k_hw_get_btcoex_scheme(sc->sc_ah)) {
 405         case ATH_BTCOEX_CFG_NONE:
 406                 break;
 407         case ATH_BTCOEX_CFG_2WIRE:
 408                 ath9k_hw_btcoex_init_2wire(sc->sc_ah);
 409                 break;
 410         case ATH_BTCOEX_CFG_3WIRE:
 411                 ath9k_hw_btcoex_init_3wire(sc->sc_ah);
 412                 r = ath_init_btcoex_timer(sc);
 413                 if (r)
 414                         return -1;
 415                 txq = sc->tx.txq_map[IEEE80211_AC_BE];
 416                 ath9k_hw_init_btcoex_hw(sc->sc_ah, txq->axq_qnum);
 417                 sc->btcoex.bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
 418                 if (ath9k_hw_mci_is_enabled(ah)) {
 419                         sc->btcoex.duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
 420                         INIT_LIST_HEAD(&sc->btcoex.mci.info);
 421
 422                         r = ath_mci_setup(sc);
 423                         if (r)
 424                                 return r;
 425
 426                         ath9k_hw_btcoex_init_mci(ah);
 427                 }
 428
 429                 break;
 430         default:
 431                 WARN_ON(1);
 432                 break;
 433         }
 434
 435         return 0;
 436 }
 437
 438 static int ath9k_dump_mci_btcoex(struct ath_softc *sc, u8 *buf, u32 size)
 439 {
 440         struct ath_btcoex *btcoex = &sc->btcoex;
 441         struct ath_mci_profile *mci = &btcoex->mci;
 442         struct ath_hw *ah = sc->sc_ah;
 443         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 444         u32 len = 0;
 445         int i;
 446
 447         ATH_DUMP_BTCOEX("Total BT profiles", NUM_PROF(mci));
 448         ATH_DUMP_BTCOEX("MGMT", mci->num_mgmt);
 449         ATH_DUMP_BTCOEX("SCO", mci->num_sco);
 450         ATH_DUMP_BTCOEX("A2DP", mci->num_a2dp);
 451         ATH_DUMP_BTCOEX("HID", mci->num_hid);
 452         ATH_DUMP_BTCOEX("PAN", mci->num_pan);
 453         ATH_DUMP_BTCOEX("ACL", mci->num_other_acl);
 454         ATH_DUMP_BTCOEX("BDR", mci->num_bdr);
 455         ATH_DUMP_BTCOEX("Aggr. Limit", mci->aggr_limit);
 456         ATH_DUMP_BTCOEX("Stomp Type", btcoex->bt_stomp_type);
 457         ATH_DUMP_BTCOEX("BTCoex Period (msec)", btcoex->btcoex_period);
 458         ATH_DUMP_BTCOEX("Duty Cycle", btcoex->duty_cycle);
 459         ATH_DUMP_BTCOEX("BT Wait time", btcoex->bt_wait_time);
 460         ATH_DUMP_BTCOEX("Concurrent Tx", btcoex_hw->mci.concur_tx);
 461         ATH_DUMP_BTCOEX("Concurrent RSSI cnt", btcoex->rssi_count);
 462
 463         len += scnprintf(buf + len, size - len, "BT Weights: ");
 464         for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
 465                 len += scnprintf(buf + len, size - len, "%08x ",
 466                                  btcoex_hw->bt_weight[i]);
 467         len += scnprintf(buf + len, size - len, "\n");
 468         len += scnprintf(buf + len, size - len, "WLAN Weights: ");
 469         for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
 470                 len += scnprintf(buf + len, size - len, "%08x ",
 471                                  btcoex_hw->wlan_weight[i]);
 472         len += scnprintf(buf + len, size - len, "\n");
 473         len += scnprintf(buf + len, size - len, "Tx Priorities: ");
 474         for (i = 0; i < ATH_BTCOEX_STOMP_MAX; i++)
 475                 len += scnprintf(buf + len, size - len, "%08x ",
 476                                 btcoex_hw->tx_prio[i]);
 477
 478         len += scnprintf(buf + len, size - len, "\n");
 479
 480         return len;
 481 }
 482
 483 static int ath9k_dump_legacy_btcoex(struct ath_softc *sc, u8 *buf, u32 size)
 484 {
 485
 486         struct ath_btcoex *btcoex = &sc->btcoex;
 487         u32 len = 0;
 488
 489         ATH_DUMP_BTCOEX("Stomp Type", btcoex->bt_stomp_type);
 490         ATH_DUMP_BTCOEX("BTCoex Period (msec)", btcoex->btcoex_period);
 491         ATH_DUMP_BTCOEX("Duty Cycle", btcoex->duty_cycle);
 492         ATH_DUMP_BTCOEX("BT Wait time", btcoex->bt_wait_time);
 493
 494         return len;
 495 }
 496
 497 int ath9k_dump_btcoex(struct ath_softc *sc, u8 *buf, u32 size)
 498 {
 499         if (ath9k_hw_mci_is_enabled(sc->sc_ah))
 500                 return ath9k_dump_mci_btcoex(sc, buf, size);
 501         else
 502                 return ath9k_dump_legacy_btcoex(sc, buf, size);
 503 }
 504
 505 #endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */