kernel/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 (!ath9k_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))
  73                 return;
  74
  75         if (ah->led_pin >= 0) {
  76                 if (!((1 << ah->led_pin) & AR_GPIO_OE_OUT_MASK))
  77                         ath9k_hw_request_gpio(ah, ah->led_pin, "ath9k-led");
  78                 return;
  79         }
  80
  81         if (AR_SREV_9287(ah))
  82                 ah->led_pin = ATH_LED_PIN_9287;
  83         else if (AR_SREV_9485(sc->sc_ah))
  84                 ah->led_pin = ATH_LED_PIN_9485;
  85         else if (AR_SREV_9300(sc->sc_ah))
  86                 ah->led_pin = ATH_LED_PIN_9300;
  87         else if (AR_SREV_9462(sc->sc_ah) || AR_SREV_9565(sc->sc_ah))
  88                 ah->led_pin = ATH_LED_PIN_9462;
  89         else
  90                 ah->led_pin = ATH_LED_PIN_DEF;
  91
  92         /* Configure gpio 1 for output */
  93         ath9k_hw_cfg_output(ah, ah->led_pin, AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
  94
  95         /* LED off, active low */
  96         ath9k_hw_set_gpio(ah, ah->led_pin, (ah->config.led_active_high) ? 0 : 1);
  97 }
  98 #endif
  99
 100 /*******************/
 101 /*      Rfkill     */
 102 /*******************/
 103
 104 static bool ath_is_rfkill_set(struct ath_softc *sc)
 105 {
 106         struct ath_hw *ah = sc->sc_ah;
 107         bool is_blocked;
 108
 109         ath9k_ps_wakeup(sc);
 110         is_blocked = ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
 111                                   ah->rfkill_polarity;
 112         ath9k_ps_restore(sc);
 113
 114         return is_blocked;
 115 }
 116
 117 void ath9k_rfkill_poll_state(struct ieee80211_hw *hw)
 118 {
 119         struct ath_softc *sc = hw->priv;
 120         bool blocked = !!ath_is_rfkill_set(sc);
 121
 122         wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
 123 }
 124
 125 void ath_start_rfkill_poll(struct ath_softc *sc)
 126 {
 127         struct ath_hw *ah = sc->sc_ah;
 128
 129         if (ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 130                 wiphy_rfkill_start_polling(sc->hw->wiphy);
 131 }
 132
 133 #ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
 134
 135 /******************/
 136 /*     BTCOEX     */
 137 /******************/
 138
 139 /*
 140  * Detects if there is any priority bt traffic
 141  */
 142 static void ath_detect_bt_priority(struct ath_softc *sc)
 143 {
 144         struct ath_btcoex *btcoex = &sc->btcoex;
 145         struct ath_hw *ah = sc->sc_ah;
 146
 147         if (ath9k_hw_gpio_get(sc->sc_ah, ah->btcoex_hw.btpriority_gpio))
 148                 btcoex->bt_priority_cnt++;
 149
 150         if (time_after(jiffies, btcoex->bt_priority_time +
 151                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
 152                 clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 153                 clear_bit(BT_OP_SCAN, &btcoex->op_flags);
 154                 /* Detect if colocated bt started scanning */
 155                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 156                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 157                                 "BT scan detected\n");
 158                         set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 159                         set_bit(BT_OP_SCAN, &btcoex->op_flags);
 160                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 161                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 162                                 "BT priority traffic detected\n");
 163                         set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 164                 }
 165
 166                 btcoex->bt_priority_cnt = 0;
 167                 btcoex->bt_priority_time = jiffies;
 168         }
 169 }
 170
 171 static void ath_mci_ftp_adjust(struct ath_softc *sc)
 172 {
 173         struct ath_btcoex *btcoex = &sc->btcoex;
 174         struct ath_mci_profile *mci = &btcoex->mci;
 175         struct ath_hw *ah = sc->sc_ah;
 176
 177         if (btcoex->bt_wait_time > ATH_BTCOEX_RX_WAIT_TIME) {
 178                 if (ar9003_mci_state(ah, MCI_STATE_NEED_FTP_STOMP) &&
 179                     (mci->num_pan || mci->num_other_acl))
 180                         ah->btcoex_hw.mci.stomp_ftp =
 181                                 (sc->rx.num_pkts < ATH_BTCOEX_STOMP_FTP_THRESH);
 182                 else
 183                         ah->btcoex_hw.mci.stomp_ftp = false;
 184                 btcoex->bt_wait_time = 0;
 185                 sc->rx.num_pkts = 0;
 186         }
 187 }
 188
 189 /*
 190  * This is the master bt coex timer which runs for every
 191  * 45ms, bt traffic will be given priority during 55% of this
 192  * period while wlan gets remaining 45%
 193  */
 194 static void ath_btcoex_period_timer(unsigned long data)
 195 {
 196         struct ath_softc *sc = (struct ath_softc *) data;
 197         struct ath_hw *ah = sc->sc_ah;
 198         struct ath_btcoex *btcoex = &sc->btcoex;
 199         enum ath_stomp_type stomp_type;
 200         u32 timer_period;
 201         unsigned long flags;
 202
 203         spin_lock_irqsave(&sc->sc_pm_lock, flags);
 204         if (sc->sc_ah->power_mode == ATH9K_PM_NETWORK_SLEEP) {
 205                 btcoex->bt_wait_time += btcoex->btcoex_period;
 206                 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 207                 goto skip_hw_wakeup;
 208         }
 209         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 210
 211         ath9k_ps_wakeup(sc);
 212         spin_lock_bh(&btcoex->btcoex_lock);
 213
 214         if (ah->caps.hw_caps & ATH9K_HW_CAP_MCI) {
 215                 ath9k_mci_update_rssi(sc);
 216                 ath_mci_ftp_adjust(sc);
 217         }
 218
 219         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 220                 ath_detect_bt_priority(sc);
 221
 222         stomp_type = btcoex->bt_stomp_type;
 223         timer_period = btcoex->btcoex_no_stomp;
 224
 225         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI)) {
 226                 if (test_bit(BT_OP_SCAN, &btcoex->op_flags)) {
 227                         stomp_type = ATH_BTCOEX_STOMP_ALL;
 228                         timer_period = btcoex->btscan_no_stomp;
 229                 }
 230         } else if (btcoex->stomp_audio >= 5) {
 231                 stomp_type = ATH_BTCOEX_STOMP_AUDIO;
 232                 btcoex->stomp_audio = 0;
 233         }
 234
 235         ath9k_hw_btcoex_bt_stomp(ah, stomp_type);
 236         ath9k_hw_btcoex_enable(ah);
 237
 238         spin_unlock_bh(&btcoex->btcoex_lock);
 239
 240         if (btcoex->btcoex_period != btcoex->btcoex_no_stomp)
 241                 mod_timer(&btcoex->no_stomp_timer,
 242                          jiffies + msecs_to_jiffies(timer_period));
 243
 244         ath9k_ps_restore(sc);
 245
 246 skip_hw_wakeup:
 247         mod_timer(&btcoex->period_timer,
 248                   jiffies + msecs_to_jiffies(btcoex->btcoex_period));
 249 }
 250
 251 /*
 252  * Generic tsf based hw timer which configures weight
 253  * registers to time slice between wlan and bt traffic
 254  */
 255 static void ath_btcoex_no_stomp_timer(unsigned long arg)
 256 {
 257         struct ath_softc *sc = (struct ath_softc *)arg;
 258         struct ath_hw *ah = sc->sc_ah;
 259         struct ath_btcoex *btcoex = &sc->btcoex;
 260
 261         ath9k_ps_wakeup(sc);
 262         spin_lock_bh(&btcoex->btcoex_lock);
 263
 264         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW ||
 265             (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI) &&
 266              test_bit(BT_OP_SCAN, &btcoex->op_flags)))
 267                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 268         else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 269                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 270
 271         ath9k_hw_btcoex_enable(ah);
 272         spin_unlock_bh(&btcoex->btcoex_lock);
 273         ath9k_ps_restore(sc);
 274 }
 275
 276 static void ath_init_btcoex_timer(struct ath_softc *sc)
 277 {
 278         struct ath_btcoex *btcoex = &sc->btcoex;
 279
 280         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
 281         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 282                 btcoex->btcoex_period / 100;
 283         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 284                                    btcoex->btcoex_period / 100;
 285         btcoex->bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
 286
 287         setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 288                         (unsigned long) sc);
 289         setup_timer(&btcoex->no_stomp_timer, ath_btcoex_no_stomp_timer,
 290                         (unsigned long) sc);
 291
 292         spin_lock_init(&btcoex->btcoex_lock);
 293 }
 294
 295 /*
 296  * (Re)start btcoex timers
 297  */
 298 void ath9k_btcoex_timer_resume(struct ath_softc *sc)
 299 {
 300         struct ath_btcoex *btcoex = &sc->btcoex;
 301         struct ath_hw *ah = sc->sc_ah;
 302
 303         if (ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_3WIRE &&
 304             ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_MCI)
 305                 return;
 306
 307         ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex timers\n");
 308
 309         /* make sure duty cycle timer is also stopped when resuming */
 310         del_timer_sync(&btcoex->no_stomp_timer);
 311
 312         btcoex->bt_priority_cnt = 0;
 313         btcoex->bt_priority_time = jiffies;
 314         clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 315         clear_bit(BT_OP_SCAN, &btcoex->op_flags);
 316
 317         mod_timer(&btcoex->period_timer, jiffies);
 318 }
 319
 320 /*
 321  * Pause btcoex timer and bt duty cycle timer
 322  */
 323 void ath9k_btcoex_timer_pause(struct ath_softc *sc)
 324 {
 325         struct ath_btcoex *btcoex = &sc->btcoex;
 326         struct ath_hw *ah = sc->sc_ah;
 327
 328         if (ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_3WIRE &&
 329             ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_MCI)
 330                 return;
 331
 332         ath_dbg(ath9k_hw_common(ah), BTCOEX, "Stopping btcoex timers\n");
 333
 334         del_timer_sync(&btcoex->period_timer);
 335         del_timer_sync(&btcoex->no_stomp_timer);
 336 }
 337
 338 void ath9k_btcoex_stop_gen_timer(struct ath_softc *sc)
 339 {
 340         struct ath_btcoex *btcoex = &sc->btcoex;
 341
 342         del_timer_sync(&btcoex->no_stomp_timer);
 343 }
 344
 345 u16 ath9k_btcoex_aggr_limit(struct ath_softc *sc, u32 max_4ms_framelen)
 346 {
 347         struct ath_btcoex *btcoex = &sc->btcoex;
 348         struct ath_mci_profile *mci = &sc->btcoex.mci;
 349         u16 aggr_limit = 0;
 350
 351         if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI) && mci->aggr_limit)
 352                 aggr_limit = (max_4ms_framelen * mci->aggr_limit) >> 4;
 353         else if (test_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags))
 354                 aggr_limit = min((max_4ms_framelen * 3) / 8,
 355                                  (u32)ATH_AMPDU_LIMIT_MAX);
 356
 357         return aggr_limit;
 358 }
 359
 360 void ath9k_btcoex_handle_interrupt(struct ath_softc *sc, u32 status)
 361 {
 362         if (status & ATH9K_INT_MCI)
 363                 ath_mci_intr(sc);
 364 }
 365
 366 void ath9k_start_btcoex(struct ath_softc *sc)
 367 {
 368         struct ath_hw *ah = sc->sc_ah;
 369
 370         if (ah->btcoex_hw.enabled ||
 371             ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
 372                 return;
 373
 374         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 375                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 376                                            AR_STOMP_LOW_WLAN_WGHT, 0);
 377         else
 378                 ath9k_hw_btcoex_set_weight(ah, 0, 0,
 379                                            ATH_BTCOEX_STOMP_NONE);
 380         ath9k_hw_btcoex_enable(ah);
 381         ath9k_btcoex_timer_resume(sc);
 382 }
 383
 384 void ath9k_stop_btcoex(struct ath_softc *sc)
 385 {
 386         struct ath_hw *ah = sc->sc_ah;
 387
 388         if (!ah->btcoex_hw.enabled ||
 389             ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
 390                 return;
 391
 392         ath9k_btcoex_timer_pause(sc);
 393         ath9k_hw_btcoex_disable(ah);
 394
 395         if (ah->caps.hw_caps & ATH9K_HW_CAP_MCI)
 396                 ath_mci_flush_profile(&sc->btcoex.mci);
 397 }
 398
 399 void ath9k_deinit_btcoex(struct ath_softc *sc)
 400 {
 401         struct ath_hw *ah = sc->sc_ah;
 402
 403         if (ath9k_hw_mci_is_enabled(ah))
 404                 ath_mci_cleanup(sc);
 405 }
 406
 407 int ath9k_init_btcoex(struct ath_softc *sc)
 408 {
 409         struct ath_txq *txq;
 410         struct ath_hw *ah = sc->sc_ah;
 411         int r;
 412
 413         ath9k_hw_btcoex_init_scheme(ah);
 414
 415         switch (ath9k_hw_get_btcoex_scheme(sc->sc_ah)) {
 416         case ATH_BTCOEX_CFG_NONE:
 417                 break;
 418         case ATH_BTCOEX_CFG_2WIRE:
 419                 ath9k_hw_btcoex_init_2wire(sc->sc_ah);
 420                 break;
 421         case ATH_BTCOEX_CFG_3WIRE:
 422                 ath9k_hw_btcoex_init_3wire(sc->sc_ah);
 423                 ath_init_btcoex_timer(sc);
 424                 txq = sc->tx.txq_map[IEEE80211_AC_BE];
 425                 ath9k_hw_init_btcoex_hw(sc->sc_ah, txq->axq_qnum);
 426                 break;
 427         case ATH_BTCOEX_CFG_MCI:
 428                 ath_init_btcoex_timer(sc);
 429
 430                 sc->btcoex.duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
 431                 INIT_LIST_HEAD(&sc->btcoex.mci.info);
 432                 ath9k_hw_btcoex_init_mci(ah);
 433
 434                 r = ath_mci_setup(sc);
 435                 if (r)
 436                         return r;
 437
 438                 break;
 439         default:
 440                 WARN_ON(1);
 441                 break;
 442         }
 443
 444         return 0;
 445 }
 446
 447 static int ath9k_dump_mci_btcoex(struct ath_softc *sc, u8 *buf, u32 size)
 448 {
 449         struct ath_btcoex *btcoex = &sc->btcoex;
 450         struct ath_mci_profile *mci = &btcoex->mci;
 451         struct ath_hw *ah = sc->sc_ah;
 452         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 453         u32 len = 0;
 454         int i;
 455
 456         ATH_DUMP_BTCOEX("Total BT profiles", NUM_PROF(mci));
 457         ATH_DUMP_BTCOEX("MGMT", mci->num_mgmt);
 458         ATH_DUMP_BTCOEX("SCO", mci->num_sco);
 459         ATH_DUMP_BTCOEX("A2DP", mci->num_a2dp);
 460         ATH_DUMP_BTCOEX("HID", mci->num_hid);
 461         ATH_DUMP_BTCOEX("PAN", mci->num_pan);
 462         ATH_DUMP_BTCOEX("ACL", mci->num_other_acl);
 463         ATH_DUMP_BTCOEX("BDR", mci->num_bdr);
 464         ATH_DUMP_BTCOEX("Aggr. Limit", mci->aggr_limit);
 465         ATH_DUMP_BTCOEX("Stomp Type", btcoex->bt_stomp_type);
 466         ATH_DUMP_BTCOEX("BTCoex Period (msec)", btcoex->btcoex_period);
 467         ATH_DUMP_BTCOEX("Duty Cycle", btcoex->duty_cycle);
 468         ATH_DUMP_BTCOEX("BT Wait time", btcoex->bt_wait_time);
 469         ATH_DUMP_BTCOEX("Concurrent Tx", btcoex_hw->mci.concur_tx);
 470         ATH_DUMP_BTCOEX("Concurrent RSSI cnt", btcoex->rssi_count);
 471
 472         len += scnprintf(buf + len, size - len, "BT Weights: ");
 473         for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
 474                 len += scnprintf(buf + len, size - len, "%08x ",
 475                                  btcoex_hw->bt_weight[i]);
 476         len += scnprintf(buf + len, size - len, "\n");
 477         len += scnprintf(buf + len, size - len, "WLAN Weights: ");
 478         for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
 479                 len += scnprintf(buf + len, size - len, "%08x ",
 480                                  btcoex_hw->wlan_weight[i]);
 481         len += scnprintf(buf + len, size - len, "\n");
 482         len += scnprintf(buf + len, size - len, "Tx Priorities: ");
 483         for (i = 0; i < ATH_BTCOEX_STOMP_MAX; i++)
 484                 len += scnprintf(buf + len, size - len, "%08x ",
 485                                 btcoex_hw->tx_prio[i]);
 486
 487         len += scnprintf(buf + len, size - len, "\n");
 488
 489         return len;
 490 }
 491
 492 static int ath9k_dump_legacy_btcoex(struct ath_softc *sc, u8 *buf, u32 size)
 493 {
 494
 495         struct ath_btcoex *btcoex = &sc->btcoex;
 496         u32 len = 0;
 497
 498         ATH_DUMP_BTCOEX("Stomp Type", btcoex->bt_stomp_type);
 499         ATH_DUMP_BTCOEX("BTCoex Period (msec)", btcoex->btcoex_period);
 500         ATH_DUMP_BTCOEX("Duty Cycle", btcoex->duty_cycle);
 501         ATH_DUMP_BTCOEX("BT Wait time", btcoex->bt_wait_time);
 502
 503         return len;
 504 }
 505
 506 int ath9k_dump_btcoex(struct ath_softc *sc, u8 *buf, u32 size)
 507 {
 508         if (ath9k_hw_mci_is_enabled(sc->sc_ah))
 509                 return ath9k_dump_mci_btcoex(sc, buf, size);
 510         else
 511                 return ath9k_dump_legacy_btcoex(sc, buf, size);
 512 }
 513
 514 #endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */