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                 sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 136                 /* Detect if colocated bt started scanning */
 137                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 138                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 139                                 "BT scan detected\n");
 140                         sc->sc_flags |= (SC_OP_BT_SCAN |
 141                                          SC_OP_BT_PRIORITY_DETECTED);
 142                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 143                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 144                                 "BT priority traffic detected\n");
 145                         sc->sc_flags |= SC_OP_BT_PRIORITY_DETECTED;
 146                 }
 147
 148                 btcoex->bt_priority_cnt = 0;
 149                 btcoex->bt_priority_time = jiffies;
 150         }
 151 }
 152
 153 static void ath9k_gen_timer_start(struct ath_hw *ah,
 154                                   struct ath_gen_timer *timer,
 155                                   u32 trig_timeout,
 156                                   u32 timer_period)
 157 {
 158         ath9k_hw_gen_timer_start(ah, timer, trig_timeout, timer_period);
 159
 160         if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
 161                 ath9k_hw_disable_interrupts(ah);
 162                 ah->imask |= ATH9K_INT_GENTIMER;
 163                 ath9k_hw_set_interrupts(ah);
 164                 ath9k_hw_enable_interrupts(ah);
 165         }
 166 }
 167
 168 static void ath9k_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer)
 169 {
 170         struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;
 171
 172         ath9k_hw_gen_timer_stop(ah, timer);
 173
 174         /* if no timer is enabled, turn off interrupt mask */
 175         if (timer_table->timer_mask.val == 0) {
 176                 ath9k_hw_disable_interrupts(ah);
 177                 ah->imask &= ~ATH9K_INT_GENTIMER;
 178                 ath9k_hw_set_interrupts(ah);
 179                 ath9k_hw_enable_interrupts(ah);
 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         u32 timer_period;
 194         bool is_btscan;
 195
 196         ath9k_ps_wakeup(sc);
 197         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 198                 ath_detect_bt_priority(sc);
 199         is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 200
 201         spin_lock_bh(&btcoex->btcoex_lock);
 202
 203         ath9k_hw_btcoex_bt_stomp(ah, is_btscan ? ATH_BTCOEX_STOMP_ALL :
 204                               btcoex->bt_stomp_type);
 205
 206         ath9k_hw_btcoex_enable(ah);
 207         spin_unlock_bh(&btcoex->btcoex_lock);
 208
 209         if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
 210                 if (btcoex->hw_timer_enabled)
 211                         ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 212
 213                 timer_period = is_btscan ? btcoex->btscan_no_stomp :
 214                                            btcoex->btcoex_no_stomp;
 215                 ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, timer_period,
 216                                       timer_period * 10);
 217                 btcoex->hw_timer_enabled = true;
 218         }
 219
 220         ath9k_ps_restore(sc);
 221         timer_period = btcoex->btcoex_period / 1000;
 222         mod_timer(&btcoex->period_timer, jiffies +
 223                                   msecs_to_jiffies(timer_period));
 224 }
 225
 226 /*
 227  * Generic tsf based hw timer which configures weight
 228  * registers to time slice between wlan and bt traffic
 229  */
 230 static void ath_btcoex_no_stomp_timer(void *arg)
 231 {
 232         struct ath_softc *sc = (struct ath_softc *)arg;
 233         struct ath_hw *ah = sc->sc_ah;
 234         struct ath_btcoex *btcoex = &sc->btcoex;
 235         struct ath_common *common = ath9k_hw_common(ah);
 236         bool is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 237
 238         ath_dbg(common, BTCOEX, "no stomp timer running\n");
 239
 240         ath9k_ps_wakeup(sc);
 241         spin_lock_bh(&btcoex->btcoex_lock);
 242
 243         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW || is_btscan)
 244                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 245          else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 246                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 247
 248         ath9k_hw_btcoex_enable(ah);
 249         spin_unlock_bh(&btcoex->btcoex_lock);
 250         ath9k_ps_restore(sc);
 251 }
 252
 253 static int ath_init_btcoex_timer(struct ath_softc *sc)
 254 {
 255         struct ath_btcoex *btcoex = &sc->btcoex;
 256
 257         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;
 258         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 259                 btcoex->btcoex_period / 100;
 260         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 261                                    btcoex->btcoex_period / 100;
 262
 263         setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 264                         (unsigned long) sc);
 265
 266         spin_lock_init(&btcoex->btcoex_lock);
 267
 268         btcoex->no_stomp_timer = ath_gen_timer_alloc(sc->sc_ah,
 269                         ath_btcoex_no_stomp_timer,
 270                         ath_btcoex_no_stomp_timer,
 271                         (void *) sc, AR_FIRST_NDP_TIMER);
 272
 273         if (!btcoex->no_stomp_timer)
 274                 return -ENOMEM;
 275
 276         return 0;
 277 }
 278
 279 /*
 280  * (Re)start btcoex timers
 281  */
 282 void ath9k_btcoex_timer_resume(struct ath_softc *sc)
 283 {
 284         struct ath_btcoex *btcoex = &sc->btcoex;
 285         struct ath_hw *ah = sc->sc_ah;
 286
 287         ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex timers\n");
 288
 289         /* make sure duty cycle timer is also stopped when resuming */
 290         if (btcoex->hw_timer_enabled)
 291                 ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);
 292
 293         btcoex->bt_priority_cnt = 0;
 294         btcoex->bt_priority_time = jiffies;
 295         sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 296
 297         mod_timer(&btcoex->period_timer, jiffies);
 298 }
 299
 300
 301 /*
 302  * Pause btcoex timer and bt duty cycle timer
 303  */
 304 void ath9k_btcoex_timer_pause(struct ath_softc *sc)
 305 {
 306         struct ath_btcoex *btcoex = &sc->btcoex;
 307         struct ath_hw *ah = sc->sc_ah;
 308
 309         del_timer_sync(&btcoex->period_timer);
 310
 311         if (btcoex->hw_timer_enabled)
 312                 ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 313
 314         btcoex->hw_timer_enabled = false;
 315 }
 316
 317 u16 ath9k_btcoex_aggr_limit(struct ath_softc *sc, u32 max_4ms_framelen)
 318 {
 319         struct ath_mci_profile *mci = &sc->btcoex.mci;
 320         u16 aggr_limit = 0;
 321
 322         if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI) && mci->aggr_limit)
 323                 aggr_limit = (max_4ms_framelen * mci->aggr_limit) >> 4;
 324         else if (sc->sc_flags & SC_OP_BT_PRIORITY_DETECTED)
 325                 aggr_limit = min((max_4ms_framelen * 3) / 8,
 326                                  (u32)ATH_AMPDU_LIMIT_MAX);
 327
 328         return aggr_limit;
 329 }
 330
 331 void ath9k_btcoex_handle_interrupt(struct ath_softc *sc, u32 status)
 332 {
 333         struct ath_hw *ah = sc->sc_ah;
 334
 335         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 336                 if (status & ATH9K_INT_GENTIMER)
 337                         ath_gen_timer_isr(sc->sc_ah);
 338
 339         if (status & ATH9K_INT_MCI)
 340                 ath_mci_intr(sc);
 341 }
 342
 343 void ath9k_start_btcoex(struct ath_softc *sc)
 344 {
 345         struct ath_hw *ah = sc->sc_ah;
 346
 347         if ((ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) &&
 348             !ah->btcoex_hw.enabled) {
 349                 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 350                         ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 351                                                    AR_STOMP_LOW_WLAN_WGHT);
 352                 ath9k_hw_btcoex_enable(ah);
 353
 354                 if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 355                         ath9k_btcoex_timer_resume(sc);
 356         }
 357 }
 358
 359 void ath9k_stop_btcoex(struct ath_softc *sc)
 360 {
 361         struct ath_hw *ah = sc->sc_ah;
 362
 363         if (ah->btcoex_hw.enabled &&
 364             ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) {
 365                 ath9k_hw_btcoex_disable(ah);
 366                 if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 367                         ath9k_btcoex_timer_pause(sc);
 368                 if (AR_SREV_9462(ah))
 369                         ath_mci_flush_profile(&sc->btcoex.mci);
 370         }
 371 }
 372
 373 void ath9k_deinit_btcoex(struct ath_softc *sc)
 374 {
 375         if ((sc->btcoex.no_stomp_timer) &&
 376             ath9k_hw_get_btcoex_scheme(sc->sc_ah) == ATH_BTCOEX_CFG_3WIRE)
 377                 ath_gen_timer_free(sc->sc_ah, sc->btcoex.no_stomp_timer);
 378
 379         if (AR_SREV_9462(sc->sc_ah))
 380                 ath_mci_cleanup(sc);
 381 }
 382
 383 int ath9k_init_btcoex(struct ath_softc *sc)
 384 {
 385         struct ath_txq *txq;
 386         struct ath_hw *ah = sc->sc_ah;
 387         int r;
 388
 389         ath9k_hw_btcoex_init_scheme(ah);
 390
 391         switch (ath9k_hw_get_btcoex_scheme(sc->sc_ah)) {
 392         case ATH_BTCOEX_CFG_NONE:
 393                 break;
 394         case ATH_BTCOEX_CFG_2WIRE:
 395                 ath9k_hw_btcoex_init_2wire(sc->sc_ah);
 396                 break;
 397         case ATH_BTCOEX_CFG_3WIRE:
 398                 ath9k_hw_btcoex_init_3wire(sc->sc_ah);
 399                 r = ath_init_btcoex_timer(sc);
 400                 if (r)
 401                         return -1;
 402                 txq = sc->tx.txq_map[WME_AC_BE];
 403                 ath9k_hw_init_btcoex_hw(sc->sc_ah, txq->axq_qnum);
 404                 sc->btcoex.bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
 405                 if (AR_SREV_9462(ah)) {
 406                         sc->btcoex.duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
 407                         INIT_LIST_HEAD(&sc->btcoex.mci.info);
 408
 409                         r = ath_mci_setup(sc);
 410                         if (r)
 411                                 return r;
 412
 413                         ath9k_hw_btcoex_init_mci(ah);
 414                 }
 415
 416                 break;
 417         default:
 418                 WARN_ON(1);
 419                 break;
 420         }
 421
 422         return 0;
 423 }
 424
 425 #endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */