drivers/net/wireless/ath/ath9k_btcoex/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_btcoex_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_btcoex_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_btcoex_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_btcoex_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_btcoex_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                 clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 133                 clear_bit(BT_OP_SCAN, &btcoex->op_flags);
 134                 /* Detect if colocated bt started scanning */
 135                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 136                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 137                                 "BT scan detected\n");
 138                         set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 139                         set_bit(BT_OP_SCAN, &btcoex->op_flags);
 140                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 141                         ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
 142                                 "BT priority traffic detected\n");
 143                         set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
 144                 }
 145
 146                 btcoex->bt_priority_cnt = 0;
 147                 btcoex->bt_priority_time = jiffies;
 148         }
 149 }
 150
 151 static void ath9k_gen_timer_start(struct ath_hw *ah,
 152                                   struct ath_gen_timer *timer,
 153                                   u32 trig_timeout,
 154                                   u32 timer_period)
 155 {
 156         ath9k_btcoex_ath9k_hw_gen_timer_start(ah, timer, trig_timeout, timer_period);
 157
 158         if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
 159                 ath9k_btcoex_ath9k_hw_disable_interrupts(ah);
 160                 ah->imask |= ATH9K_INT_GENTIMER;
 161                 ath9k_btcoex_ath9k_hw_set_interrupts(ah);
 162                 ath9k_btcoex_ath9k_hw_enable_interrupts(ah);
 163         }
 164 }
 165
 166 static void ath9k_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer)
 167 {
 168         struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;
 169
 170         ath9k_btcoex_ath9k_hw_gen_timer_stop(ah, timer);
 171
 172         /* if no timer is enabled, turn off interrupt mask */
 173         if (timer_table->timer_mask.val == 0) {
 174                 ath9k_btcoex_ath9k_hw_disable_interrupts(ah);
 175                 ah->imask &= ~ATH9K_INT_GENTIMER;
 176                 ath9k_btcoex_ath9k_hw_set_interrupts(ah);
 177                 ath9k_btcoex_ath9k_hw_enable_interrupts(ah);
 178         }
 179 }
 180
 181 /*
 182  * This is the master bt coex timer which runs for every
 183  * 45ms, bt traffic will be given priority during 55% of this
 184  * period while wlan gets remaining 45%
 185  */
 186 static void ath_btcoex_period_timer(unsigned long data)
 187 {
 188         struct ath_softc *sc = (struct ath_softc *) data;
 189         struct ath_hw *ah = sc->sc_ah;
 190         struct ath_btcoex *btcoex = &sc->btcoex;
 191         struct ath_mci_profile *mci = &btcoex->mci;
 192         u32 timer_period;
 193         bool is_btscan;
 194         unsigned long flags;
 195
 196         spin_lock_irqsave(&sc->sc_pm_lock, flags);
 197         if (sc->sc_ah->power_mode == ATH9K_PM_NETWORK_SLEEP) {
 198                 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 199                 goto skip_hw_wakeup;
 200         }
 201         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 202
 203         ath9k_ps_wakeup(sc);
 204         if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 205                 ath_detect_bt_priority(sc);
 206         is_btscan = test_bit(BT_OP_SCAN, &btcoex->op_flags);
 207
 208         btcoex->bt_wait_time += btcoex->btcoex_period;
 209         if (btcoex->bt_wait_time > ATH_BTCOEX_RX_WAIT_TIME) {
 210                 if (ath9k_btcoex_ar9003_mci_state(ah, MCI_STATE_NEED_FTP_STOMP) &&
 211                     (mci->num_pan || mci->num_other_acl))
 212                         ah->btcoex_hw.mci.stomp_ftp =
 213                                 (sc->rx.num_pkts < ATH_BTCOEX_STOMP_FTP_THRESH);
 214                 else
 215                         ah->btcoex_hw.mci.stomp_ftp = false;
 216                 btcoex->bt_wait_time = 0;
 217                 sc->rx.num_pkts = 0;
 218         }
 219
 220         spin_lock_bh(&btcoex->btcoex_lock);
 221
 222         ath9k_btcoex_ath9k_hw_btcoex_bt_stomp(ah, is_btscan ? ATH_BTCOEX_STOMP_ALL :
 223                               btcoex->bt_stomp_type);
 224
 225         ath9k_btcoex_ath9k_hw_btcoex_enable(ah);
 226         spin_unlock_bh(&btcoex->btcoex_lock);
 227
 228         if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
 229                 if (btcoex->hw_timer_enabled)
 230                         ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 231
 232                 timer_period = is_btscan ? btcoex->btscan_no_stomp :
 233                                            btcoex->btcoex_no_stomp;
 234                 ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, timer_period,
 235                                       timer_period * 10);
 236                 btcoex->hw_timer_enabled = true;
 237         }
 238
 239         ath9k_ps_restore(sc);
 240 skip_hw_wakeup:
 241         timer_period = btcoex->btcoex_period;
 242         mod_timer(&btcoex->period_timer, jiffies + msecs_to_jiffies(timer_period));
 243 }
 244
 245 /*
 246  * Generic tsf based hw timer which configures weight
 247  * registers to time slice between wlan and bt traffic
 248  */
 249 static void ath_btcoex_no_stomp_timer(void *arg)
 250 {
 251         struct ath_softc *sc = (struct ath_softc *)arg;
 252         struct ath_hw *ah = sc->sc_ah;
 253         struct ath_btcoex *btcoex = &sc->btcoex;
 254         struct ath_common *common = ath9k_hw_common(ah);
 255
 256         ath_dbg(common, BTCOEX, "no stomp timer running\n");
 257
 258         ath9k_ps_wakeup(sc);
 259         spin_lock_bh(&btcoex->btcoex_lock);
 260
 261         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW ||
 262             test_bit(BT_OP_SCAN, &btcoex->op_flags))
 263                 ath9k_btcoex_ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 264          else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 265                 ath9k_btcoex_ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 266
 267         ath9k_btcoex_ath9k_hw_btcoex_enable(ah);
 268         spin_unlock_bh(&btcoex->btcoex_lock);
 269         ath9k_ps_restore(sc);
 270 }
 271
 272 static int ath_init_btcoex_timer(struct ath_softc *sc)
 273 {
 274         struct ath_btcoex *btcoex = &sc->btcoex;
 275
 276         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
 277         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) * 1000 *
 278                 btcoex->btcoex_period / 100;
 279         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) * 1000 *
 280                                    btcoex->btcoex_period / 100;
 281
 282         setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 283                         (unsigned long) sc);
 284
 285         spin_lock_init(&btcoex->btcoex_lock);
 286
 287         btcoex->no_stomp_timer = ath9k_btcoex_ath_gen_timer_alloc(sc->sc_ah,
 288                         ath_btcoex_no_stomp_timer,
 289                         ath_btcoex_no_stomp_timer,
 290                         (void *) sc, AR_FIRST_NDP_TIMER);
 291
 292         if (!btcoex->no_stomp_timer)
 293                 return -ENOMEM;
 294
 295         return 0;
 296 }
 297
 298 /*
 299  * (Re)start btcoex timers
 300  */
 301 void ath9k_btcoex_timer_resume(struct ath_softc *sc)
 302 {
 303         struct ath_btcoex *btcoex = &sc->btcoex;
 304         struct ath_hw *ah = sc->sc_ah;
 305
 306         ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex timers\n");
 307
 308         /* make sure duty cycle timer is also stopped when resuming */
 309         if (btcoex->hw_timer_enabled)
 310                 ath9k_gen_timer_stop(sc->sc_ah, 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 /*
 322  * Pause btcoex timer and bt duty cycle timer
 323  */
 324 void ath9k_btcoex_timer_pause(struct ath_softc *sc)
 325 {
 326         struct ath_btcoex *btcoex = &sc->btcoex;
 327         struct ath_hw *ah = sc->sc_ah;
 328
 329         del_timer_sync(&btcoex->period_timer);
 330
 331         if (btcoex->hw_timer_enabled)
 332                 ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 333
 334         btcoex->hw_timer_enabled = false;
 335 }
 336
 337 void ath9k_btcoex_stop_gen_timer(struct ath_softc *sc)
 338 {
 339         struct ath_btcoex *btcoex = &sc->btcoex;
 340
 341         ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);
 342 }
 343
 344 u16 ath9k_btcoex_aggr_limit(struct ath_softc *sc, u32 max_4ms_framelen)
 345 {
 346         struct ath_btcoex *btcoex = &sc->btcoex;
 347         struct ath_mci_profile *mci = &sc->btcoex.mci;
 348         u16 aggr_limit = 0;
 349
 350         if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI) && mci->aggr_limit)
 351                 aggr_limit = (max_4ms_framelen * mci->aggr_limit) >> 4;
 352         else if (test_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags))
 353                 aggr_limit = min((max_4ms_framelen * 3) / 8,
 354                                  (u32)ATH_AMPDU_LIMIT_MAX);
 355
 356         return aggr_limit;
 357 }
 358
 359 void ath9k_btcoex_handle_interrupt(struct ath_softc *sc, u32 status)
 360 {
 361         struct ath_hw *ah = sc->sc_ah;
 362
 363         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 364                 if (status & ATH9K_INT_GENTIMER)
 365                         ath9k_btcoex_ath_gen_timer_isr(sc->sc_ah);
 366
 367         if (status & ATH9K_INT_MCI)
 368                 ath_mci_intr(sc);
 369 }
 370
 371 void ath9k_start_btcoex(struct ath_softc *sc)
 372 {
 373         struct ath_hw *ah = sc->sc_ah;
 374
 375         if ((ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) &&
 376             !ah->btcoex_hw.enabled) {
 377                 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
 378                         ath9k_btcoex_ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 379                                                    AR_STOMP_LOW_WLAN_WGHT);
 380                 ath9k_btcoex_ath9k_hw_btcoex_enable(ah);
 381
 382                 if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 383                         ath9k_btcoex_timer_resume(sc);
 384         }
 385 }
 386
 387 void ath9k_stop_btcoex(struct ath_softc *sc)
 388 {
 389         struct ath_hw *ah = sc->sc_ah;
 390
 391         if (ah->btcoex_hw.enabled &&
 392             ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) {
 393                 if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE)
 394                         ath9k_btcoex_timer_pause(sc);
 395                 ath9k_btcoex_ath9k_hw_btcoex_disable(ah);
 396                 if (AR_SREV_9462(ah))
 397                         ath_mci_flush_profile(&sc->btcoex.mci);
 398         }
 399 }
 400
 401 void ath9k_deinit_btcoex(struct ath_softc *sc)
 402 {
 403         struct ath_hw *ah = sc->sc_ah;
 404
 405         if ((sc->btcoex.no_stomp_timer) &&
 406             ath9k_hw_get_btcoex_scheme(sc->sc_ah) == ATH_BTCOEX_CFG_3WIRE)
 407                 ath9k_btcoex_ath_gen_timer_free(sc->sc_ah, sc->btcoex.no_stomp_timer);
 408
 409         if (ath9k_hw_mci_is_enabled(ah))
 410                 ath_mci_cleanup(sc);
 411 }
 412
 413 int ath9k_init_btcoex(struct ath_softc *sc)
 414 {
 415         struct ath_txq *txq;
 416         struct ath_hw *ah = sc->sc_ah;
 417         int r;
 418
 419         ath9k_btcoex_ath9k_hw_btcoex_init_scheme(ah);
 420
 421         switch (ath9k_hw_get_btcoex_scheme(sc->sc_ah)) {
 422         case ATH_BTCOEX_CFG_NONE:
 423                 break;
 424         case ATH_BTCOEX_CFG_2WIRE:
 425                 ath9k_btcoex_ath9k_hw_btcoex_init_2wire(sc->sc_ah);
 426                 break;
 427         case ATH_BTCOEX_CFG_3WIRE:
 428                 ath9k_btcoex_ath9k_hw_btcoex_init_3wire(sc->sc_ah);
 429                 r = ath_init_btcoex_timer(sc);
 430                 if (r)
 431                         return -1;
 432                 txq = sc->tx.txq_map[WME_AC_BE];
 433                 ath9k_btcoex_ath9k_hw_init_btcoex_hw(sc->sc_ah, txq->axq_qnum);
 434                 sc->btcoex.bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
 435                 if (ath9k_hw_mci_is_enabled(ah)) {
 436                         sc->btcoex.duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
 437                         INIT_LIST_HEAD(&sc->btcoex.mci.info);
 438
 439                         r = ath_mci_setup(sc);
 440                         if (r)
 441                                 return r;
 442
 443                         ath9k_btcoex_ath9k_hw_btcoex_init_mci(ah);
 444                 }
 445
 446                 break;
 447         default:
 448                 WARN_ON(1);
 449                 break;
 450         }
 451
 452         return 0;
 453 }
 454
 455 #endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */