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 (sc->sc_ah->led_pin < 0) {
  45                 if (AR_SREV_9287(sc->sc_ah))
  46                         sc->sc_ah->led_pin = ATH_LED_PIN_9287;
  47                 else if (AR_SREV_9485(sc->sc_ah))
  48                         sc->sc_ah->led_pin = ATH_LED_PIN_9485;
  49                 else if (AR_SREV_9300(sc->sc_ah))
  50                         sc->sc_ah->led_pin = ATH_LED_PIN_9300;
  51                 else if (AR_SREV_9462(sc->sc_ah))
  52                         sc->sc_ah->led_pin = ATH_LED_PIN_9462;
  53                 else
  54                         sc->sc_ah->led_pin = ATH_LED_PIN_DEF;
  55         }
  56
  57         /* Configure gpio 1 for output */
  58         ath9k_hw_cfg_output(sc->sc_ah, sc->sc_ah->led_pin,
  59                             AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
  60         /* LED off, active low */
  61         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);
  62
  63         if (!led_blink)
  64                 sc->led_cdev.default_trigger =
  65                         ieee80211_get_radio_led_name(sc->hw);
  66
  67         snprintf(sc->led_name, sizeof(sc->led_name),
  68                 "ath9k-%s", wiphy_name(sc->hw->wiphy));
  69         sc->led_cdev.name = sc->led_name;
  70         sc->led_cdev.brightness_set = ath_led_brightness;
  71
  72         ret = led_classdev_register(wiphy_dev(sc->hw->wiphy), &sc->led_cdev);
  73         if (ret < 0)
  74                 return;
  75
  76         sc->led_registered = true;
  77 }
  78 #endif
  79
  80 /*******************/
  81 /*      Rfkill     */
  82 /*******************/
  83
  84 static bool ath_is_rfkill_set(struct ath_softc *sc)
  85 {
  86         struct ath_hw *ah = sc->sc_ah;
  87         bool is_blocked;
  88
  89         ath9k_ps_wakeup(sc);
  90         is_blocked = ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
  91                                   ah->rfkill_polarity;
  92         ath9k_ps_restore(sc);
  93
  94         return is_blocked;
  95 }
  96
  97 void ath9k_rfkill_poll_state(struct ieee80211_hw *hw)
  98 {
  99         struct ath_softc *sc = hw->priv;
 100         bool blocked = !!ath_is_rfkill_set(sc);
 101
 102         wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
 103 }
 104
 105 void ath_start_rfkill_poll(struct ath_softc *sc)
 106 {
 107         struct ath_hw *ah = sc->sc_ah;
 108
 109         if (ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 110                 wiphy_rfkill_start_polling(sc->hw->wiphy);
 111 }
 112
 113 #ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
 114
 115 /******************/
 116 /*     BTCOEX     */
 117 /******************/
 118
 119 /*
 120  * Detects if there is any priority bt traffic
 121  */
 122 static void ath_detect_bt_priority(struct ath_softc *sc)
 123 {
 124         struct ath_btcoex *btcoex = &sc->btcoex;
 125         struct ath_hw *ah = sc->sc_ah;
 126
 127         if (ath9k_hw_gpio_get(sc->sc_ah, ah->btcoex_hw.btpriority_gpio))
 128                 btcoex->bt_priority_cnt++;
 129
 130         if (time_after(jiffies, btcoex->bt_priority_time +
 131                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
 132                 sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 133                 /* Detect if colocated bt started scanning */
 134                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 135                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 136                                 "BT scan detected\n");
 137                         sc->sc_flags |= (SC_OP_BT_SCAN |
 138                                          SC_OP_BT_PRIORITY_DETECTED);
 139                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 140                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 141                                 "BT priority traffic detected\n");
 142                         sc->sc_flags |= SC_OP_BT_PRIORITY_DETECTED;
 143                 }
 144
 145                 btcoex->bt_priority_cnt = 0;
 146                 btcoex->bt_priority_time = jiffies;
 147         }
 148 }
 149
 150 static void ath9k_gen_timer_start(struct ath_hw *ah,
 151                                   struct ath_gen_timer *timer,
 152                                   u32 trig_timeout,
 153                                   u32 timer_period)
 154 {
 155         ath9k_hw_gen_timer_start(ah, timer, trig_timeout, timer_period);
 156
 157         if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
 158                 ath9k_hw_disable_interrupts(ah);
 159                 ah->imask |= ATH9K_INT_GENTIMER;
 160                 ath9k_hw_set_interrupts(ah);
 161                 ath9k_hw_enable_interrupts(ah);
 162         }
 163 }
 164
 165 static void ath9k_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer)
 166 {
 167         struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;
 168
 169         ath9k_hw_gen_timer_stop(ah, timer);
 170
 171         /* if no timer is enabled, turn off interrupt mask */
 172         if (timer_table->timer_mask.val == 0) {
 173                 ath9k_hw_disable_interrupts(ah);
 174                 ah->imask &= ~ATH9K_INT_GENTIMER;
 175                 ath9k_hw_set_interrupts(ah);
 176                 ath9k_hw_enable_interrupts(ah);
 177         }
 178 }
 179
 180 /*
 181  * This is the master bt coex timer which runs for every
 182  * 45ms, bt traffic will be given priority during 55% of this
 183  * period while wlan gets remaining 45%
 184  */
 185 static void ath_btcoex_period_timer(unsigned long data)
 186 {
 187         struct ath_softc *sc = (struct ath_softc *) data;
 188         struct ath_hw *ah = sc->sc_ah;
 189         struct ath_btcoex *btcoex = &sc->btcoex;
 190         u32 timer_period;
 191         bool is_btscan;
 192
 193         ath9k_ps_wakeup(sc);
 194         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 195                 ath_detect_bt_priority(sc);
 196         is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 197
 198         spin_lock_bh(&btcoex->btcoex_lock);
 199
 200         ath9k_hw_btcoex_bt_stomp(ah, is_btscan ? ATH_BTCOEX_STOMP_ALL :
 201                               btcoex->bt_stomp_type);
 202
 203         ath9k_hw_btcoex_enable(ah);
 204         spin_unlock_bh(&btcoex->btcoex_lock);
 205
 206         if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
 207                 if (btcoex->hw_timer_enabled)
 208                         ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 209
 210                 timer_period = is_btscan ? btcoex->btscan_no_stomp :
 211                                            btcoex->btcoex_no_stomp;
 212                 ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, timer_period,
 213                                       timer_period * 10);
 214                 btcoex->hw_timer_enabled = true;
 215         }
 216
 217         ath9k_ps_restore(sc);
 218         timer_period = btcoex->btcoex_period / 1000;
 219         mod_timer(&btcoex->period_timer, jiffies +
 220                                   msecs_to_jiffies(timer_period));
 221 }
 222
 223 /*
 224  * Generic tsf based hw timer which configures weight
 225  * registers to time slice between wlan and bt traffic
 226  */
 227 static void ath_btcoex_no_stomp_timer(void *arg)
 228 {
 229         struct ath_softc *sc = (struct ath_softc *)arg;
 230         struct ath_hw *ah = sc->sc_ah;
 231         struct ath_btcoex *btcoex = &sc->btcoex;
 232         struct ath_common *common = ath9k_hw_common(ah);
 233         bool is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 234
 235         ath_dbg(common, BTCOEX, "no stomp timer running\n");
 236
 237         ath9k_ps_wakeup(sc);
 238         spin_lock_bh(&btcoex->btcoex_lock);
 239
 240         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW || is_btscan)
 241                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 242          else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 243                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 244
 245         ath9k_hw_btcoex_enable(ah);
 246         spin_unlock_bh(&btcoex->btcoex_lock);
 247         ath9k_ps_restore(sc);
 248 }
 249
 250 static int ath_init_btcoex_timer(struct ath_softc *sc)
 251 {
 252         struct ath_btcoex *btcoex = &sc->btcoex;
 253
 254         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;
 255         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 256                 btcoex->btcoex_period / 100;
 257         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 258                                    btcoex->btcoex_period / 100;
 259
 260         setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 261                         (unsigned long) sc);
 262
 263         spin_lock_init(&btcoex->btcoex_lock);
 264
 265         btcoex->no_stomp_timer = ath_gen_timer_alloc(sc->sc_ah,
 266                         ath_btcoex_no_stomp_timer,
 267                         ath_btcoex_no_stomp_timer,
 268                         (void *) sc, AR_FIRST_NDP_TIMER);
 269
 270         if (!btcoex->no_stomp_timer)
 271                 return -ENOMEM;
 272
 273         return 0;
 274 }
 275
 276 /*
 277  * (Re)start btcoex timers
 278  */
 279 void ath9k_btcoex_timer_resume(struct ath_softc *sc)
 280 {
 281         struct ath_btcoex *btcoex = &sc->btcoex;
 282         struct ath_hw *ah = sc->sc_ah;
 283
 284         ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex timers\n");
 285
 286         /* make sure duty cycle timer is also stopped when resuming */
 287         if (btcoex->hw_timer_enabled)
 288                 ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);
 289
 290         btcoex->bt_priority_cnt = 0;
 291         btcoex->bt_priority_time = jiffies;
 292         sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 293
 294         mod_timer(&btcoex->period_timer, jiffies);
 295 }
 296
 297
 298 /*
 299  * Pause btcoex timer and bt duty cycle timer
 300  */
 301 void ath9k_btcoex_timer_pause(struct ath_softc *sc)
 302 {
 303         struct ath_btcoex *btcoex = &sc->btcoex;
 304         struct ath_hw *ah = sc->sc_ah;
 305
 306         del_timer_sync(&btcoex->period_timer);
 307
 308         if (btcoex->hw_timer_enabled)
 309                 ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 310
 311         btcoex->hw_timer_enabled = false;
 312 }
 313
 314 u16 ath9k_btcoex_aggr_limit(struct ath_softc *sc, u32 max_4ms_framelen)
 315 {
 316         struct ath_mci_profile *mci = &sc->btcoex.mci;
 317         u16 aggr_limit = 0;
 318
 319         if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI) && mci->aggr_limit)
 320                 aggr_limit = (max_4ms_framelen * mci->aggr_limit) >> 4;
 321         else if (sc->sc_flags & SC_OP_BT_PRIORITY_DETECTED)
 322                 aggr_limit = min((max_4ms_framelen * 3) / 8,
 323                                  (u32)ATH_AMPDU_LIMIT_MAX);
 324
 325         return aggr_limit;
 326 }
 327
 328 void ath9k_btcoex_handle_interrupt(struct ath_softc *sc, u32 status)
 329 {
 330         struct ath_hw *ah = sc->sc_ah;
 331
 332         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 333                 if (status & ATH9K_INT_GENTIMER)
 334                         ath_gen_timer_isr(sc->sc_ah);
 335
 336         if (status & ATH9K_INT_MCI)
 337                 ath_mci_intr(sc);
 338 }
 339
 340 void ath9k_start_btcoex(struct ath_softc *sc)
 341 {
 342         struct ath_hw *ah = sc->sc_ah;
 343
 344         if ((ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) &&
 345             !ah->btcoex_hw.enabled) {
 346                 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 347                         ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 348                                                    AR_STOMP_LOW_WLAN_WGHT);
 349                 ath9k_hw_btcoex_enable(ah);
 350
 351                 if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 352                         ath9k_btcoex_timer_resume(sc);
 353         }
 354 }
 355
 356 void ath9k_stop_btcoex(struct ath_softc *sc)
 357 {
 358         struct ath_hw *ah = sc->sc_ah;
 359
 360         if (ah->btcoex_hw.enabled &&
 361             ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) {
 362                 ath9k_hw_btcoex_disable(ah);
 363                 if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 364                         ath9k_btcoex_timer_pause(sc);
 365                 ath_mci_flush_profile(&sc->btcoex.mci);
 366         }
 367 }
 368
 369 void ath9k_deinit_btcoex(struct ath_softc *sc)
 370 {
 371         if ((sc->btcoex.no_stomp_timer) &&
 372             ath9k_hw_get_btcoex_scheme(sc->sc_ah) == ATH_BTCOEX_CFG_3WIRE)
 373                 ath_gen_timer_free(sc->sc_ah, sc->btcoex.no_stomp_timer);
 374
 375         if (ath9k_hw_get_btcoex_scheme(sc->sc_ah) == ATH_BTCOEX_CFG_MCI)
 376                 ath_mci_cleanup(sc);
 377 }
 378
 379 int ath9k_init_btcoex(struct ath_softc *sc)
 380 {
 381         struct ath_txq *txq;
 382         struct ath_hw *ah = sc->sc_ah;
 383         int r;
 384
 385         ath9k_hw_btcoex_init_scheme(ah);
 386
 387         switch (ath9k_hw_get_btcoex_scheme(sc->sc_ah)) {
 388         case ATH_BTCOEX_CFG_NONE:
 389                 break;
 390         case ATH_BTCOEX_CFG_2WIRE:
 391                 ath9k_hw_btcoex_init_2wire(sc->sc_ah);
 392                 break;
 393         case ATH_BTCOEX_CFG_3WIRE:
 394                 ath9k_hw_btcoex_init_3wire(sc->sc_ah);
 395                 r = ath_init_btcoex_timer(sc);
 396                 if (r)
 397                         return -1;
 398                 txq = sc->tx.txq_map[WME_AC_BE];
 399                 ath9k_hw_init_btcoex_hw(sc->sc_ah, txq->axq_qnum);
 400                 sc->btcoex.bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
 401                 break;
 402         case ATH_BTCOEX_CFG_MCI:
 403                 sc->btcoex.bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
 404                 sc->btcoex.duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
 405                 INIT_LIST_HEAD(&sc->btcoex.mci.info);
 406
 407                 r = ath_mci_setup(sc);
 408                 if (r)
 409                         return r;
 410
 411                 ath9k_hw_btcoex_init_mci(ah);
 412
 413                 break;
 414         default:
 415                 WARN_ON(1);
 416                 break;
 417         }
 418
 419         return 0;
 420 }
 421
 422 #endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */