drivers/net/wireless/ath/ath9k/gpio.c

   1 /*
   2  * Copyright (c) 2008-2009 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
  50                         sc->sc_ah->led_pin = ATH_LED_PIN_DEF;
  51         }
  52
  53         /* Configure gpio 1 for output */
  54         ath9k_hw_cfg_output(sc->sc_ah, sc->sc_ah->led_pin,
  55                             AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
  56         /* LED off, active low */
  57         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);
  58
  59         if (!led_blink)
  60                 sc->led_cdev.default_trigger =
  61                         ieee80211_get_radio_led_name(sc->hw);
  62
  63         snprintf(sc->led_name, sizeof(sc->led_name),
  64                 "ath9k-%s", wiphy_name(sc->hw->wiphy));
  65         sc->led_cdev.name = sc->led_name;
  66         sc->led_cdev.brightness_set = ath_led_brightness;
  67
  68         ret = led_classdev_register(wiphy_dev(sc->hw->wiphy), &sc->led_cdev);
  69         if (ret < 0)
  70                 return;
  71
  72         sc->led_registered = true;
  73 }
  74 #endif
  75
  76 /*******************/
  77 /*      Rfkill     */
  78 /*******************/
  79
  80 static bool ath_is_rfkill_set(struct ath_softc *sc)
  81 {
  82         struct ath_hw *ah = sc->sc_ah;
  83
  84         return ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
  85                                   ah->rfkill_polarity;
  86 }
  87
  88 void ath9k_rfkill_poll_state(struct ieee80211_hw *hw)
  89 {
  90         struct ath_softc *sc = hw->priv;
  91         bool blocked = !!ath_is_rfkill_set(sc);
  92
  93         wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
  94 }
  95
  96 void ath_start_rfkill_poll(struct ath_softc *sc)
  97 {
  98         struct ath_hw *ah = sc->sc_ah;
  99
 100         if (ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 101                 wiphy_rfkill_start_polling(sc->hw->wiphy);
 102 }
 103
 104 /******************/
 105 /*     BTCOEX     */
 106 /******************/
 107
 108 /*
 109  * Detects if there is any priority bt traffic
 110  */
 111 static void ath_detect_bt_priority(struct ath_softc *sc)
 112 {
 113         struct ath_btcoex *btcoex = &sc->btcoex;
 114         struct ath_hw *ah = sc->sc_ah;
 115
 116         if (ath9k_hw_gpio_get(sc->sc_ah, ah->btcoex_hw.btpriority_gpio))
 117                 btcoex->bt_priority_cnt++;
 118
 119         if (time_after(jiffies, btcoex->bt_priority_time +
 120                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
 121                 sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 122                 /* Detect if colocated bt started scanning */
 123                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 124                         ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
 125                                 "BT scan detected\n");
 126                         sc->sc_flags |= (SC_OP_BT_SCAN |
 127                                          SC_OP_BT_PRIORITY_DETECTED);
 128                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 129                         ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
 130                                 "BT priority traffic detected\n");
 131                         sc->sc_flags |= SC_OP_BT_PRIORITY_DETECTED;
 132                 }
 133
 134                 btcoex->bt_priority_cnt = 0;
 135                 btcoex->bt_priority_time = jiffies;
 136         }
 137 }
 138
 139 static void ath9k_gen_timer_start(struct ath_hw *ah,
 140                                   struct ath_gen_timer *timer,
 141                                   u32 timer_next,
 142                                   u32 timer_period)
 143 {
 144         ath9k_hw_gen_timer_start(ah, timer, timer_next, timer_period);
 145
 146         if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
 147                 ath9k_hw_disable_interrupts(ah);
 148                 ah->imask |= ATH9K_INT_GENTIMER;
 149                 ath9k_hw_set_interrupts(ah, ah->imask);
 150         }
 151 }
 152
 153 static void ath9k_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer)
 154 {
 155         struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;
 156
 157         ath9k_hw_gen_timer_stop(ah, timer);
 158
 159         /* if no timer is enabled, turn off interrupt mask */
 160         if (timer_table->timer_mask.val == 0) {
 161                 ath9k_hw_disable_interrupts(ah);
 162                 ah->imask &= ~ATH9K_INT_GENTIMER;
 163                 ath9k_hw_set_interrupts(ah, ah->imask);
 164         }
 165 }
 166
 167 /*
 168  * This is the master bt coex timer which runs for every
 169  * 45ms, bt traffic will be given priority during 55% of this
 170  * period while wlan gets remaining 45%
 171  */
 172 static void ath_btcoex_period_timer(unsigned long data)
 173 {
 174         struct ath_softc *sc = (struct ath_softc *) data;
 175         struct ath_hw *ah = sc->sc_ah;
 176         struct ath_btcoex *btcoex = &sc->btcoex;
 177         struct ath_common *common = ath9k_hw_common(ah);
 178         u32 timer_period;
 179         bool is_btscan;
 180
 181         ath_detect_bt_priority(sc);
 182
 183         is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 184
 185         spin_lock_bh(&btcoex->btcoex_lock);
 186
 187         ath9k_cmn_btcoex_bt_stomp(common, is_btscan ? ATH_BTCOEX_STOMP_ALL :
 188                               btcoex->bt_stomp_type);
 189
 190         spin_unlock_bh(&btcoex->btcoex_lock);
 191
 192         if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
 193                 if (btcoex->hw_timer_enabled)
 194                         ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 195
 196                 timer_period = is_btscan ? btcoex->btscan_no_stomp :
 197                                            btcoex->btcoex_no_stomp;
 198                 ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, 0,
 199                                       timer_period * 10);
 200                 btcoex->hw_timer_enabled = true;
 201         }
 202
 203         mod_timer(&btcoex->period_timer, jiffies +
 204                                   msecs_to_jiffies(ATH_BTCOEX_DEF_BT_PERIOD));
 205 }
 206
 207 /*
 208  * Generic tsf based hw timer which configures weight
 209  * registers to time slice between wlan and bt traffic
 210  */
 211 static void ath_btcoex_no_stomp_timer(void *arg)
 212 {
 213         struct ath_softc *sc = (struct ath_softc *)arg;
 214         struct ath_hw *ah = sc->sc_ah;
 215         struct ath_btcoex *btcoex = &sc->btcoex;
 216         struct ath_common *common = ath9k_hw_common(ah);
 217         bool is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 218
 219         ath_dbg(common, ATH_DBG_BTCOEX,
 220                 "no stomp timer running\n");
 221
 222         spin_lock_bh(&btcoex->btcoex_lock);
 223
 224         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW || is_btscan)
 225                 ath9k_cmn_btcoex_bt_stomp(common, ATH_BTCOEX_STOMP_NONE);
 226          else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 227                 ath9k_cmn_btcoex_bt_stomp(common, ATH_BTCOEX_STOMP_LOW);
 228
 229         spin_unlock_bh(&btcoex->btcoex_lock);
 230 }
 231
 232 int ath_init_btcoex_timer(struct ath_softc *sc)
 233 {
 234         struct ath_btcoex *btcoex = &sc->btcoex;
 235
 236         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;
 237         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 238                 btcoex->btcoex_period / 100;
 239         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 240                                    btcoex->btcoex_period / 100;
 241
 242         setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 243                         (unsigned long) sc);
 244
 245         spin_lock_init(&btcoex->btcoex_lock);
 246
 247         btcoex->no_stomp_timer = ath_gen_timer_alloc(sc->sc_ah,
 248                         ath_btcoex_no_stomp_timer,
 249                         ath_btcoex_no_stomp_timer,
 250                         (void *) sc, AR_FIRST_NDP_TIMER);
 251
 252         if (!btcoex->no_stomp_timer)
 253                 return -ENOMEM;
 254
 255         return 0;
 256 }
 257
 258 /*
 259  * (Re)start btcoex timers
 260  */
 261 void ath9k_btcoex_timer_resume(struct ath_softc *sc)
 262 {
 263         struct ath_btcoex *btcoex = &sc->btcoex;
 264         struct ath_hw *ah = sc->sc_ah;
 265
 266         ath_dbg(ath9k_hw_common(ah), ATH_DBG_BTCOEX,
 267                 "Starting btcoex timers\n");
 268
 269         /* make sure duty cycle timer is also stopped when resuming */
 270         if (btcoex->hw_timer_enabled)
 271                 ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);
 272
 273         btcoex->bt_priority_cnt = 0;
 274         btcoex->bt_priority_time = jiffies;
 275         sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 276
 277         mod_timer(&btcoex->period_timer, jiffies);
 278 }
 279
 280
 281 /*
 282  * Pause btcoex timer and bt duty cycle timer
 283  */
 284 void ath9k_btcoex_timer_pause(struct ath_softc *sc)
 285 {
 286         struct ath_btcoex *btcoex = &sc->btcoex;
 287         struct ath_hw *ah = sc->sc_ah;
 288
 289         del_timer_sync(&btcoex->period_timer);
 290
 291         if (btcoex->hw_timer_enabled)
 292                 ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 293
 294         btcoex->hw_timer_enabled = false;
 295 }