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 (!led_blink)
  48                 sc->led_cdev.default_trigger =
  49                         ieee80211_get_radio_led_name(sc->hw);
  50
  51         snprintf(sc->led_name, sizeof(sc->led_name),
  52                 "ath9k-%s", wiphy_name(sc->hw->wiphy));
  53         sc->led_cdev.name = sc->led_name;
  54         sc->led_cdev.brightness_set = ath_led_brightness;
  55
  56         ret = led_classdev_register(wiphy_dev(sc->hw->wiphy), &sc->led_cdev);
  57         if (ret < 0)
  58                 return;
  59
  60         sc->led_registered = true;
  61 }
  62
  63 void ath_fill_led_pin(struct ath_softc *sc)
  64 {
  65         struct ath_hw *ah = sc->sc_ah;
  66
  67         if (AR_SREV_9100(ah) || (ah->led_pin >= 0))
  68                 return;
  69
  70         if (AR_SREV_9287(ah))
  71                 ah->led_pin = ATH_LED_PIN_9287;
  72         else if (AR_SREV_9485(sc->sc_ah))
  73                 ah->led_pin = ATH_LED_PIN_9485;
  74         else if (AR_SREV_9300(sc->sc_ah))
  75                 ah->led_pin = ATH_LED_PIN_9300;
  76         else if (AR_SREV_9462(sc->sc_ah) || AR_SREV_9565(sc->sc_ah))
  77                 ah->led_pin = ATH_LED_PIN_9462;
  78         else
  79                 ah->led_pin = ATH_LED_PIN_DEF;
  80
  81         /* Configure gpio 1 for output */
  82         ath9k_hw_cfg_output(ah, ah->led_pin, AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
  83
  84         /* LED off, active low */
  85         ath9k_hw_set_gpio(ah, ah->led_pin, 1);
  86 }
  87 #endif
  88
  89 /*******************/
  90 /*      Rfkill     */
  91 /*******************/
  92
  93 static bool ath_is_rfkill_set(struct ath_softc *sc)
  94 {
  95         struct ath_hw *ah = sc->sc_ah;
  96         bool is_blocked;
  97
  98         ath9k_ps_wakeup(sc);
  99         is_blocked = ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
 100                                   ah->rfkill_polarity;
 101         ath9k_ps_restore(sc);
 102
 103         return is_blocked;
 104 }
 105
 106 void ath9k_rfkill_poll_state(struct ieee80211_hw *hw)
 107 {
 108         struct ath_softc *sc = hw->priv;
 109         bool blocked = !!ath_is_rfkill_set(sc);
 110
 111         wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
 112 }
 113
 114 void ath_start_rfkill_poll(struct ath_softc *sc)
 115 {
 116         struct ath_hw *ah = sc->sc_ah;
 117
 118         if (ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 119                 wiphy_rfkill_start_polling(sc->hw->wiphy);
 120 }
 121
 122 #ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
 123
 124 /******************/
 125 /*     BTCOEX     */
 126 /******************/
 127
 128 /*
 129  * Detects if there is any priority bt traffic
 130  */
 131 static void ath_detect_bt_priority(struct ath_softc *sc)
 132 {
 133         struct ath_btcoex *btcoex = &sc->btcoex;
 134         struct ath_hw *ah = sc->sc_ah;
 135
 136         if (ath9k_hw_gpio_get(sc->sc_ah, ah->btcoex_hw.btpriority_gpio))
 137                 btcoex->bt_priority_cnt++;
 138
 139         if (time_after(jiffies, btcoex->bt_priority_time +
 140                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
 141                 clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 142                 clear_bit(BT_OP_SCAN, &btcoex->op_flags);
 143                 /* Detect if colocated bt started scanning */
 144                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 145                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 146                                 "BT scan detected\n");
 147                         set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 148                         set_bit(BT_OP_SCAN, &btcoex->op_flags);
 149                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 150                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 151                                 "BT priority traffic detected\n");
 152                         set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 153                 }
 154
 155                 btcoex->bt_priority_cnt = 0;
 156                 btcoex->bt_priority_time = jiffies;
 157         }
 158 }
 159
 160 static void ath9k_gen_timer_start(struct ath_hw *ah,
 161                                   struct ath_gen_timer *timer,
 162                                   u32 trig_timeout,
 163                                   u32 timer_period)
 164 {
 165         ath9k_hw_gen_timer_start(ah, timer, trig_timeout, timer_period);
 166
 167         if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
 168                 ath9k_hw_disable_interrupts(ah);
 169                 ah->imask |= ATH9K_INT_GENTIMER;
 170                 ath9k_hw_set_interrupts(ah);
 171                 ath9k_hw_enable_interrupts(ah);
 172         }
 173 }
 174
 175 static void ath9k_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer)
 176 {
 177         struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;
 178
 179         ath9k_hw_gen_timer_stop(ah, timer);
 180
 181         /* if no timer is enabled, turn off interrupt mask */
 182         if (timer_table->timer_mask.val == 0) {
 183                 ath9k_hw_disable_interrupts(ah);
 184                 ah->imask &= ~ATH9K_INT_GENTIMER;
 185                 ath9k_hw_set_interrupts(ah);
 186                 ath9k_hw_enable_interrupts(ah);
 187         }
 188 }
 189
 190 /*
 191  * This is the master bt coex timer which runs for every
 192  * 45ms, bt traffic will be given priority during 55% of this
 193  * period while wlan gets remaining 45%
 194  */
 195 static void ath_btcoex_period_timer(unsigned long data)
 196 {
 197         struct ath_softc *sc = (struct ath_softc *) data;
 198         struct ath_hw *ah = sc->sc_ah;
 199         struct ath_btcoex *btcoex = &sc->btcoex;
 200         struct ath_mci_profile *mci = &btcoex->mci;
 201         u32 timer_period;
 202         bool is_btscan;
 203         unsigned long flags;
 204
 205         spin_lock_irqsave(&sc->sc_pm_lock, flags);
 206         if (sc->sc_ah->power_mode == ATH9K_PM_NETWORK_SLEEP) {
 207                 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 208                 goto skip_hw_wakeup;
 209         }
 210         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 211
 212         ath9k_ps_wakeup(sc);
 213         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 214                 ath_detect_bt_priority(sc);
 215         is_btscan = test_bit(BT_OP_SCAN, &btcoex->op_flags);
 216
 217         btcoex->bt_wait_time += btcoex->btcoex_period;
 218         if (btcoex->bt_wait_time > ATH_BTCOEX_RX_WAIT_TIME) {
 219                 if (ar9003_mci_state(ah, MCI_STATE_NEED_FTP_STOMP) &&
 220                     (mci->num_pan || mci->num_other_acl))
 221                         ah->btcoex_hw.mci.stomp_ftp =
 222                                 (sc->rx.num_pkts < ATH_BTCOEX_STOMP_FTP_THRESH);
 223                 else
 224                         ah->btcoex_hw.mci.stomp_ftp = false;
 225                 btcoex->bt_wait_time = 0;
 226                 sc->rx.num_pkts = 0;
 227         }
 228
 229         spin_lock_bh(&btcoex->btcoex_lock);
 230
 231         ath9k_hw_btcoex_bt_stomp(ah, is_btscan ? ATH_BTCOEX_STOMP_ALL :
 232                               btcoex->bt_stomp_type);
 233
 234         ath9k_hw_btcoex_enable(ah);
 235         spin_unlock_bh(&btcoex->btcoex_lock);
 236
 237         /*
 238          * btcoex_period is in msec while (btocex/btscan_)no_stomp are in usec,
 239          * ensure that we properly convert btcoex_period to usec
 240          * for any comparision with (btcoex/btscan_)no_stomp.
 241          */
 242         if (btcoex->btcoex_period * 1000 != btcoex->btcoex_no_stomp) {
 243                 if (btcoex->hw_timer_enabled)
 244                         ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 245
 246                 timer_period = is_btscan ? btcoex->btscan_no_stomp :
 247                                            btcoex->btcoex_no_stomp;
 248                 ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, timer_period,
 249                                       timer_period * 10);
 250                 btcoex->hw_timer_enabled = true;
 251         }
 252
 253         ath9k_ps_restore(sc);
 254 skip_hw_wakeup:
 255         timer_period = btcoex->btcoex_period;
 256         mod_timer(&btcoex->period_timer, jiffies + msecs_to_jiffies(timer_period));
 257 }
 258
 259 /*
 260  * Generic tsf based hw timer which configures weight
 261  * registers to time slice between wlan and bt traffic
 262  */
 263 static void ath_btcoex_no_stomp_timer(void *arg)
 264 {
 265         struct ath_softc *sc = (struct ath_softc *)arg;
 266         struct ath_hw *ah = sc->sc_ah;
 267         struct ath_btcoex *btcoex = &sc->btcoex;
 268         struct ath_common *common = ath9k_hw_common(ah);
 269
 270         ath_dbg(common, BTCOEX, "no stomp timer running\n");
 271
 272         ath9k_ps_wakeup(sc);
 273         spin_lock_bh(&btcoex->btcoex_lock);
 274
 275         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW ||
 276             test_bit(BT_OP_SCAN, &btcoex->op_flags))
 277                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 278          else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 279                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 280
 281         ath9k_hw_btcoex_enable(ah);
 282         spin_unlock_bh(&btcoex->btcoex_lock);
 283         ath9k_ps_restore(sc);
 284 }
 285
 286 static int ath_init_btcoex_timer(struct ath_softc *sc)
 287 {
 288         struct ath_btcoex *btcoex = &sc->btcoex;
 289
 290         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
 291         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) * 1000 *
 292                 btcoex->btcoex_period / 100;
 293         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) * 1000 *
 294                                    btcoex->btcoex_period / 100;
 295
 296         setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 297                         (unsigned long) sc);
 298
 299         spin_lock_init(&btcoex->btcoex_lock);
 300
 301         btcoex->no_stomp_timer = ath_gen_timer_alloc(sc->sc_ah,
 302                         ath_btcoex_no_stomp_timer,
 303                         ath_btcoex_no_stomp_timer,
 304                         (void *) sc, AR_FIRST_NDP_TIMER);
 305
 306         if (!btcoex->no_stomp_timer)
 307                 return -ENOMEM;
 308
 309         return 0;
 310 }
 311
 312 /*
 313  * (Re)start btcoex timers
 314  */
 315 void ath9k_btcoex_timer_resume(struct ath_softc *sc)
 316 {
 317         struct ath_btcoex *btcoex = &sc->btcoex;
 318         struct ath_hw *ah = sc->sc_ah;
 319
 320         ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex timers\n");
 321
 322         /* make sure duty cycle timer is also stopped when resuming */
 323         if (btcoex->hw_timer_enabled) {
 324                 ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);
 325                 btcoex->hw_timer_enabled = false;
 326         }
 327
 328         btcoex->bt_priority_cnt = 0;
 329         btcoex->bt_priority_time = jiffies;
 330         clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 331         clear_bit(BT_OP_SCAN, &btcoex->op_flags);
 332
 333         mod_timer(&btcoex->period_timer, jiffies);
 334 }
 335
 336
 337 /*
 338  * Pause btcoex timer and bt duty cycle timer
 339  */
 340 void ath9k_btcoex_timer_pause(struct ath_softc *sc)
 341 {
 342         struct ath_btcoex *btcoex = &sc->btcoex;
 343         struct ath_hw *ah = sc->sc_ah;
 344
 345         del_timer_sync(&btcoex->period_timer);
 346
 347         if (btcoex->hw_timer_enabled) {
 348                 ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 349                 btcoex->hw_timer_enabled = false;
 350         }
 351 }
 352
 353 void ath9k_btcoex_stop_gen_timer(struct ath_softc *sc)
 354 {
 355         struct ath_btcoex *btcoex = &sc->btcoex;
 356
 357         if (btcoex->hw_timer_enabled) {
 358                 ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);
 359                 btcoex->hw_timer_enabled = false;
 360         }
 361 }
 362
 363 u16 ath9k_btcoex_aggr_limit(struct ath_softc *sc, u32 max_4ms_framelen)
 364 {
 365         struct ath_btcoex *btcoex = &sc->btcoex;
 366         struct ath_mci_profile *mci = &sc->btcoex.mci;
 367         u16 aggr_limit = 0;
 368
 369         if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI) && mci->aggr_limit)
 370                 aggr_limit = (max_4ms_framelen * mci->aggr_limit) >> 4;
 371         else if (test_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags))
 372                 aggr_limit = min((max_4ms_framelen * 3) / 8,
 373                                  (u32)ATH_AMPDU_LIMIT_MAX);
 374
 375         return aggr_limit;
 376 }
 377
 378 void ath9k_btcoex_handle_interrupt(struct ath_softc *sc, u32 status)
 379 {
 380         struct ath_hw *ah = sc->sc_ah;
 381
 382         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 383                 if (status & ATH9K_INT_GENTIMER)
 384                         ath_gen_timer_isr(sc->sc_ah);
 385
 386         if (status & ATH9K_INT_MCI)
 387                 ath_mci_intr(sc);
 388 }
 389
 390 void ath9k_start_btcoex(struct ath_softc *sc)
 391 {
 392         struct ath_hw *ah = sc->sc_ah;
 393
 394         if ((ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) &&
 395             !ah->btcoex_hw.enabled) {
 396                 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 397                         ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 398                                                    AR_STOMP_LOW_WLAN_WGHT, 0);
 399                 else
 400                         ath9k_hw_btcoex_set_weight(ah, 0, 0,
 401                                                    ATH_BTCOEX_STOMP_NONE);
 402                 ath9k_hw_btcoex_enable(ah);
 403
 404                 if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 405                         ath9k_btcoex_timer_resume(sc);
 406         }
 407 }
 408
 409 void ath9k_stop_btcoex(struct ath_softc *sc)
 410 {
 411         struct ath_hw *ah = sc->sc_ah;
 412
 413         if (ah->btcoex_hw.enabled &&
 414             ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) {
 415                 if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 416                         ath9k_btcoex_timer_pause(sc);
 417                 ath9k_hw_btcoex_disable(ah);
 418                 if (AR_SREV_9462(ah) || AR_SREV_9565(ah))
 419                         ath_mci_flush_profile(&sc->btcoex.mci);
 420         }
 421 }
 422
 423 void ath9k_deinit_btcoex(struct ath_softc *sc)
 424 {
 425         struct ath_hw *ah = sc->sc_ah;
 426
 427         if ((sc->btcoex.no_stomp_timer) &&
 428             ath9k_hw_get_btcoex_scheme(sc->sc_ah) == ATH_BTCOEX_CFG_3WIRE)
 429                 ath_gen_timer_free(sc->sc_ah, sc->btcoex.no_stomp_timer);
 430
 431         if (ath9k_hw_mci_is_enabled(ah))
 432                 ath_mci_cleanup(sc);
 433 }
 434
 435 int ath9k_init_btcoex(struct ath_softc *sc)
 436 {
 437         struct ath_txq *txq;
 438         struct ath_hw *ah = sc->sc_ah;
 439         int r;
 440
 441         ath9k_hw_btcoex_init_scheme(ah);
 442
 443         switch (ath9k_hw_get_btcoex_scheme(sc->sc_ah)) {
 444         case ATH_BTCOEX_CFG_NONE:
 445                 break;
 446         case ATH_BTCOEX_CFG_2WIRE:
 447                 ath9k_hw_btcoex_init_2wire(sc->sc_ah);
 448                 break;
 449         case ATH_BTCOEX_CFG_3WIRE:
 450                 ath9k_hw_btcoex_init_3wire(sc->sc_ah);
 451                 r = ath_init_btcoex_timer(sc);
 452                 if (r)
 453                         return -1;
 454                 txq = sc->tx.txq_map[WME_AC_BE];
 455                 ath9k_hw_init_btcoex_hw(sc->sc_ah, txq->axq_qnum);
 456                 sc->btcoex.bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
 457                 if (ath9k_hw_mci_is_enabled(ah)) {
 458                         sc->btcoex.duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
 459                         INIT_LIST_HEAD(&sc->btcoex.mci.info);
 460
 461                         r = ath_mci_setup(sc);
 462                         if (r)
 463                                 return r;
 464
 465                         ath9k_hw_btcoex_init_mci(ah);
 466                 }
 467
 468                 break;
 469         default:
 470                 WARN_ON(1);
 471                 break;
 472         }
 473
 474         return 0;
 475 }
 476
 477 #endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */