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         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, (brightness == LED_OFF));
  29 }
  30
  31 void ath_deinit_leds(struct ath_softc *sc)
  32 {
  33         if (!sc->led_registered)
  34                 return;
  35
  36         ath_led_brightness(&sc->led_cdev, LED_OFF);
  37         led_classdev_unregister(&sc->led_cdev);
  38 }
  39
  40 void ath_init_leds(struct ath_softc *sc)
  41 {
  42         int ret;
  43
  44         if (AR_SREV_9100(sc->sc_ah))
  45                 return;
  46
  47         if (sc->sc_ah->led_pin < 0) {
  48                 if (AR_SREV_9287(sc->sc_ah))
  49                         sc->sc_ah->led_pin = ATH_LED_PIN_9287;
  50                 else if (AR_SREV_9485(sc->sc_ah))
  51                         sc->sc_ah->led_pin = ATH_LED_PIN_9485;
  52                 else if (AR_SREV_9300(sc->sc_ah))
  53                         sc->sc_ah->led_pin = ATH_LED_PIN_9300;
  54                 else if (AR_SREV_9462(sc->sc_ah))
  55                         sc->sc_ah->led_pin = ATH_LED_PIN_9462;
  56                 else
  57                         sc->sc_ah->led_pin = ATH_LED_PIN_DEF;
  58         }
  59
  60         /* Configure gpio 1 for output */
  61         ath9k_hw_cfg_output(sc->sc_ah, sc->sc_ah->led_pin,
  62                             AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
  63         /* LED off, active low */
  64         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);
  65
  66         if (!led_blink)
  67                 sc->led_cdev.default_trigger =
  68                         ieee80211_get_radio_led_name(sc->hw);
  69
  70         snprintf(sc->led_name, sizeof(sc->led_name),
  71                 "ath9k-%s", wiphy_name(sc->hw->wiphy));
  72         sc->led_cdev.name = sc->led_name;
  73         sc->led_cdev.brightness_set = ath_led_brightness;
  74
  75         ret = led_classdev_register(wiphy_dev(sc->hw->wiphy), &sc->led_cdev);
  76         if (ret < 0)
  77                 return;
  78
  79         sc->led_registered = true;
  80 }
  81 #endif
  82
  83 /*******************/
  84 /*      Rfkill     */
  85 /*******************/
  86
  87 static bool ath_is_rfkill_set(struct ath_softc *sc)
  88 {
  89         struct ath_hw *ah = sc->sc_ah;
  90         bool is_blocked;
  91
  92         ath9k_ps_wakeup(sc);
  93         is_blocked = ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
  94                                   ah->rfkill_polarity;
  95         ath9k_ps_restore(sc);
  96
  97         return is_blocked;
  98 }
  99
 100 void ath9k_rfkill_poll_state(struct ieee80211_hw *hw)
 101 {
 102         struct ath_softc *sc = hw->priv;
 103         bool blocked = !!ath_is_rfkill_set(sc);
 104
 105         wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
 106 }
 107
 108 void ath_start_rfkill_poll(struct ath_softc *sc)
 109 {
 110         struct ath_hw *ah = sc->sc_ah;
 111
 112         if (ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 113                 wiphy_rfkill_start_polling(sc->hw->wiphy);
 114 }
 115
 116 #ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
 117
 118 /******************/
 119 /*     BTCOEX     */
 120 /******************/
 121
 122 /*
 123  * Detects if there is any priority bt traffic
 124  */
 125 static void ath_detect_bt_priority(struct ath_softc *sc)
 126 {
 127         struct ath_btcoex *btcoex = &sc->btcoex;
 128         struct ath_hw *ah = sc->sc_ah;
 129
 130         if (ath9k_hw_gpio_get(sc->sc_ah, ah->btcoex_hw.btpriority_gpio))
 131                 btcoex->bt_priority_cnt++;
 132
 133         if (time_after(jiffies, btcoex->bt_priority_time +
 134                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
 135                 clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 136                 clear_bit(BT_OP_SCAN, &btcoex->op_flags);
 137                 /* Detect if colocated bt started scanning */
 138                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 139                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 140                                 "BT scan detected\n");
 141                         set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 142                         set_bit(BT_OP_SCAN, &btcoex->op_flags);
 143                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 144                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 145                                 "BT priority traffic detected\n");
 146                         set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 147                 }
 148
 149                 btcoex->bt_priority_cnt = 0;
 150                 btcoex->bt_priority_time = jiffies;
 151         }
 152 }
 153
 154 static void ath9k_gen_timer_start(struct ath_hw *ah,
 155                                   struct ath_gen_timer *timer,
 156                                   u32 trig_timeout,
 157                                   u32 timer_period)
 158 {
 159         ath9k_hw_gen_timer_start(ah, timer, trig_timeout, timer_period);
 160
 161         if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
 162                 ath9k_hw_disable_interrupts(ah);
 163                 ah->imask |= ATH9K_INT_GENTIMER;
 164                 ath9k_hw_set_interrupts(ah);
 165                 ath9k_hw_enable_interrupts(ah);
 166         }
 167 }
 168
 169 static void ath9k_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer)
 170 {
 171         struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;
 172
 173         ath9k_hw_gen_timer_stop(ah, timer);
 174
 175         /* if no timer is enabled, turn off interrupt mask */
 176         if (timer_table->timer_mask.val == 0) {
 177                 ath9k_hw_disable_interrupts(ah);
 178                 ah->imask &= ~ATH9K_INT_GENTIMER;
 179                 ath9k_hw_set_interrupts(ah);
 180                 ath9k_hw_enable_interrupts(ah);
 181         }
 182 }
 183
 184 /*
 185  * This is the master bt coex timer which runs for every
 186  * 45ms, bt traffic will be given priority during 55% of this
 187  * period while wlan gets remaining 45%
 188  */
 189 static void ath_btcoex_period_timer(unsigned long data)
 190 {
 191         struct ath_softc *sc = (struct ath_softc *) data;
 192         struct ath_hw *ah = sc->sc_ah;
 193         struct ath_btcoex *btcoex = &sc->btcoex;
 194         struct ath_mci_profile *mci = &btcoex->mci;
 195         u32 timer_period;
 196         bool is_btscan;
 197         unsigned long flags;
 198
 199         spin_lock_irqsave(&sc->sc_pm_lock, flags);
 200         if (sc->sc_ah->power_mode == ATH9K_PM_NETWORK_SLEEP) {
 201                 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 202                 goto skip_hw_wakeup;
 203         }
 204         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 205
 206         ath9k_ps_wakeup(sc);
 207         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 208                 ath_detect_bt_priority(sc);
 209         is_btscan = test_bit(BT_OP_SCAN, &btcoex->op_flags);
 210
 211         btcoex->bt_wait_time += btcoex->btcoex_period;
 212         if (btcoex->bt_wait_time > ATH_BTCOEX_RX_WAIT_TIME) {
 213                 if (ar9003_mci_state(ah, MCI_STATE_NEED_FTP_STOMP) &&
 214                     (mci->num_pan || mci->num_other_acl))
 215                         ah->btcoex_hw.mci.stomp_ftp =
 216                                 (sc->rx.num_pkts < ATH_BTCOEX_STOMP_FTP_THRESH);
 217                 else
 218                         ah->btcoex_hw.mci.stomp_ftp = false;
 219                 btcoex->bt_wait_time = 0;
 220                 sc->rx.num_pkts = 0;
 221         }
 222
 223         spin_lock_bh(&btcoex->btcoex_lock);
 224
 225         ath9k_hw_btcoex_bt_stomp(ah, is_btscan ? ATH_BTCOEX_STOMP_ALL :
 226                               btcoex->bt_stomp_type);
 227
 228         ath9k_hw_btcoex_enable(ah);
 229         spin_unlock_bh(&btcoex->btcoex_lock);
 230
 231         if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
 232                 if (btcoex->hw_timer_enabled)
 233                         ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 234
 235                 timer_period = is_btscan ? btcoex->btscan_no_stomp :
 236                                            btcoex->btcoex_no_stomp;
 237                 ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, timer_period,
 238                                       timer_period * 10);
 239                 btcoex->hw_timer_enabled = true;
 240         }
 241
 242         ath9k_ps_restore(sc);
 243 skip_hw_wakeup:
 244         timer_period = btcoex->btcoex_period;
 245         mod_timer(&btcoex->period_timer, jiffies + msecs_to_jiffies(timer_period));
 246 }
 247
 248 /*
 249  * Generic tsf based hw timer which configures weight
 250  * registers to time slice between wlan and bt traffic
 251  */
 252 static void ath_btcoex_no_stomp_timer(void *arg)
 253 {
 254         struct ath_softc *sc = (struct ath_softc *)arg;
 255         struct ath_hw *ah = sc->sc_ah;
 256         struct ath_btcoex *btcoex = &sc->btcoex;
 257         struct ath_common *common = ath9k_hw_common(ah);
 258
 259         ath_dbg(common, BTCOEX, "no stomp timer running\n");
 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             test_bit(BT_OP_SCAN, &btcoex->op_flags))
 266                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 267          else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 268                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 269
 270         ath9k_hw_btcoex_enable(ah);
 271         spin_unlock_bh(&btcoex->btcoex_lock);
 272         ath9k_ps_restore(sc);
 273 }
 274
 275 static int ath_init_btcoex_timer(struct ath_softc *sc)
 276 {
 277         struct ath_btcoex *btcoex = &sc->btcoex;
 278
 279         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
 280         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) * 1000 *
 281                 btcoex->btcoex_period / 100;
 282         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) * 1000 *
 283                                    btcoex->btcoex_period / 100;
 284
 285         setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 286                         (unsigned long) sc);
 287
 288         spin_lock_init(&btcoex->btcoex_lock);
 289
 290         btcoex->no_stomp_timer = ath_gen_timer_alloc(sc->sc_ah,
 291                         ath_btcoex_no_stomp_timer,
 292                         ath_btcoex_no_stomp_timer,
 293                         (void *) sc, AR_FIRST_NDP_TIMER);
 294
 295         if (!btcoex->no_stomp_timer)
 296                 return -ENOMEM;
 297
 298         return 0;
 299 }
 300
 301 /*
 302  * (Re)start btcoex timers
 303  */
 304 void ath9k_btcoex_timer_resume(struct ath_softc *sc)
 305 {
 306         struct ath_btcoex *btcoex = &sc->btcoex;
 307         struct ath_hw *ah = sc->sc_ah;
 308
 309         ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex timers\n");
 310
 311         /* make sure duty cycle timer is also stopped when resuming */
 312         if (btcoex->hw_timer_enabled)
 313                 ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);
 314
 315         btcoex->bt_priority_cnt = 0;
 316         btcoex->bt_priority_time = jiffies;
 317         clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 318         clear_bit(BT_OP_SCAN, &btcoex->op_flags);
 319
 320         mod_timer(&btcoex->period_timer, jiffies);
 321 }
 322
 323
 324 /*
 325  * Pause btcoex timer and bt duty cycle timer
 326  */
 327 void ath9k_btcoex_timer_pause(struct ath_softc *sc)
 328 {
 329         struct ath_btcoex *btcoex = &sc->btcoex;
 330         struct ath_hw *ah = sc->sc_ah;
 331
 332         del_timer_sync(&btcoex->period_timer);
 333
 334         if (btcoex->hw_timer_enabled)
 335                 ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 336
 337         btcoex->hw_timer_enabled = false;
 338 }
 339
 340 void ath9k_btcoex_stop_gen_timer(struct ath_softc *sc)
 341 {
 342         struct ath_btcoex *btcoex = &sc->btcoex;
 343
 344         ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);
 345 }
 346
 347 u16 ath9k_btcoex_aggr_limit(struct ath_softc *sc, u32 max_4ms_framelen)
 348 {
 349         struct ath_btcoex *btcoex = &sc->btcoex;
 350         struct ath_mci_profile *mci = &sc->btcoex.mci;
 351         u16 aggr_limit = 0;
 352
 353         if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI) && mci->aggr_limit)
 354                 aggr_limit = (max_4ms_framelen * mci->aggr_limit) >> 4;
 355         else if (test_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags))
 356                 aggr_limit = min((max_4ms_framelen * 3) / 8,
 357                                  (u32)ATH_AMPDU_LIMIT_MAX);
 358
 359         return aggr_limit;
 360 }
 361
 362 void ath9k_btcoex_handle_interrupt(struct ath_softc *sc, u32 status)
 363 {
 364         struct ath_hw *ah = sc->sc_ah;
 365
 366         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 367                 if (status & ATH9K_INT_GENTIMER)
 368                         ath_gen_timer_isr(sc->sc_ah);
 369
 370         if (status & ATH9K_INT_MCI)
 371                 ath_mci_intr(sc);
 372 }
 373
 374 void ath9k_start_btcoex(struct ath_softc *sc)
 375 {
 376         struct ath_hw *ah = sc->sc_ah;
 377
 378         if ((ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) &&
 379             !ah->btcoex_hw.enabled) {
 380                 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 381                         ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 382                                                    AR_STOMP_LOW_WLAN_WGHT);
 383                 ath9k_hw_btcoex_enable(ah);
 384
 385                 if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 386                         ath9k_btcoex_timer_resume(sc);
 387         }
 388 }
 389
 390 void ath9k_stop_btcoex(struct ath_softc *sc)
 391 {
 392         struct ath_hw *ah = sc->sc_ah;
 393
 394         if (ah->btcoex_hw.enabled &&
 395             ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) {
 396                 if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 397                         ath9k_btcoex_timer_pause(sc);
 398                 ath9k_hw_btcoex_disable(ah);
 399                 if (AR_SREV_9462(ah))
 400                         ath_mci_flush_profile(&sc->btcoex.mci);
 401         }
 402 }
 403
 404 void ath9k_deinit_btcoex(struct ath_softc *sc)
 405 {
 406         struct ath_hw *ah = sc->sc_ah;
 407
 408         if ((sc->btcoex.no_stomp_timer) &&
 409             ath9k_hw_get_btcoex_scheme(sc->sc_ah) == ATH_BTCOEX_CFG_3WIRE)
 410                 ath_gen_timer_free(sc->sc_ah, sc->btcoex.no_stomp_timer);
 411
 412         if (ath9k_hw_mci_is_enabled(ah))
 413                 ath_mci_cleanup(sc);
 414 }
 415
 416 int ath9k_init_btcoex(struct ath_softc *sc)
 417 {
 418         struct ath_txq *txq;
 419         struct ath_hw *ah = sc->sc_ah;
 420         int r;
 421
 422         ath9k_hw_btcoex_init_scheme(ah);
 423
 424         switch (ath9k_hw_get_btcoex_scheme(sc->sc_ah)) {
 425         case ATH_BTCOEX_CFG_NONE:
 426                 break;
 427         case ATH_BTCOEX_CFG_2WIRE:
 428                 ath9k_hw_btcoex_init_2wire(sc->sc_ah);
 429                 break;
 430         case ATH_BTCOEX_CFG_3WIRE:
 431                 ath9k_hw_btcoex_init_3wire(sc->sc_ah);
 432                 r = ath_init_btcoex_timer(sc);
 433                 if (r)
 434                         return -1;
 435                 txq = sc->tx.txq_map[WME_AC_BE];
 436                 ath9k_hw_init_btcoex_hw(sc->sc_ah, txq->axq_qnum);
 437                 sc->btcoex.bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
 438                 if (ath9k_hw_mci_is_enabled(ah)) {
 439                         sc->btcoex.duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
 440                         INIT_LIST_HEAD(&sc->btcoex.mci.info);
 441
 442                         r = ath_mci_setup(sc);
 443                         if (r)
 444                                 return r;
 445
 446                         ath9k_hw_btcoex_init_mci(ah);
 447                 }
 448
 449                 break;
 450         default:
 451                 WARN_ON(1);
 452                 break;
 453         }
 454
 455         return 0;
 456 }
 457
 458 #endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */