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
  52                         sc->sc_ah->led_pin = ATH_LED_PIN_DEF;
  53         }
  54
  55         /* Configure gpio 1 for output */
  56         ath9k_hw_cfg_output(sc->sc_ah, sc->sc_ah->led_pin,
  57                             AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
  58         /* LED off, active low */
  59         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);
  60
  61         if (!led_blink)
  62                 sc->led_cdev.default_trigger =
  63                         ieee80211_get_radio_led_name(sc->hw);
  64
  65         snprintf(sc->led_name, sizeof(sc->led_name),
  66                 "ath9k-%s", wiphy_name(sc->hw->wiphy));
  67         sc->led_cdev.name = sc->led_name;
  68         sc->led_cdev.brightness_set = ath_led_brightness;
  69
  70         ret = led_classdev_register(wiphy_dev(sc->hw->wiphy), &sc->led_cdev);
  71         if (ret < 0)
  72                 return;
  73
  74         sc->led_registered = true;
  75 }
  76 #endif
  77
  78 /*******************/
  79 /*      Rfkill     */
  80 /*******************/
  81
  82 static bool ath_is_rfkill_set(struct ath_softc *sc)
  83 {
  84         struct ath_hw *ah = sc->sc_ah;
  85
  86         return ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
  87                                   ah->rfkill_polarity;
  88 }
  89
  90 void ath9k_rfkill_poll_state(struct ieee80211_hw *hw)
  91 {
  92         struct ath_softc *sc = hw->priv;
  93         bool blocked = !!ath_is_rfkill_set(sc);
  94
  95         wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
  96 }
  97
  98 void ath_start_rfkill_poll(struct ath_softc *sc)
  99 {
 100         struct ath_hw *ah = sc->sc_ah;
 101
 102         if (ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 103                 wiphy_rfkill_start_polling(sc->hw->wiphy);
 104 }
 105
 106 /******************/
 107 /*     BTCOEX     */
 108 /******************/
 109
 110 /*
 111  * Detects if there is any priority bt traffic
 112  */
 113 static void ath_detect_bt_priority(struct ath_softc *sc)
 114 {
 115         struct ath_btcoex *btcoex = &sc->btcoex;
 116         struct ath_hw *ah = sc->sc_ah;
 117
 118         if (ath9k_hw_gpio_get(sc->sc_ah, ah->btcoex_hw.btpriority_gpio))
 119                 btcoex->bt_priority_cnt++;
 120
 121         if (time_after(jiffies, btcoex->bt_priority_time +
 122                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
 123                 sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 124                 /* Detect if colocated bt started scanning */
 125                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 126                         ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
 127                                 "BT scan detected\n");
 128                         sc->sc_flags |= (SC_OP_BT_SCAN |
 129                                          SC_OP_BT_PRIORITY_DETECTED);
 130                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 131                         ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
 132                                 "BT priority traffic detected\n");
 133                         sc->sc_flags |= SC_OP_BT_PRIORITY_DETECTED;
 134                 }
 135
 136                 btcoex->bt_priority_cnt = 0;
 137                 btcoex->bt_priority_time = jiffies;
 138         }
 139 }
 140
 141 static void ath9k_gen_timer_start(struct ath_hw *ah,
 142                                   struct ath_gen_timer *timer,
 143                                   u32 trig_timeout,
 144                                   u32 timer_period)
 145 {
 146         ath9k_hw_gen_timer_start(ah, timer, trig_timeout, timer_period);
 147
 148         if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
 149                 ath9k_hw_disable_interrupts(ah);
 150                 ah->imask |= ATH9K_INT_GENTIMER;
 151                 ath9k_hw_set_interrupts(ah, ah->imask);
 152         }
 153 }
 154
 155 static void ath9k_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer)
 156 {
 157         struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;
 158
 159         ath9k_hw_gen_timer_stop(ah, timer);
 160
 161         /* if no timer is enabled, turn off interrupt mask */
 162         if (timer_table->timer_mask.val == 0) {
 163                 ath9k_hw_disable_interrupts(ah);
 164                 ah->imask &= ~ATH9K_INT_GENTIMER;
 165                 ath9k_hw_set_interrupts(ah, ah->imask);
 166         }
 167 }
 168
 169 /*
 170  * This is the master bt coex timer which runs for every
 171  * 45ms, bt traffic will be given priority during 55% of this
 172  * period while wlan gets remaining 45%
 173  */
 174 static void ath_btcoex_period_timer(unsigned long data)
 175 {
 176         struct ath_softc *sc = (struct ath_softc *) data;
 177         struct ath_hw *ah = sc->sc_ah;
 178         struct ath_btcoex *btcoex = &sc->btcoex;
 179         u32 timer_period;
 180         bool is_btscan;
 181
 182         ath9k_ps_wakeup(sc);
 183         ath_detect_bt_priority(sc);
 184
 185         is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 186
 187         spin_lock_bh(&btcoex->btcoex_lock);
 188
 189         ath9k_hw_btcoex_bt_stomp(ah, is_btscan ? ATH_BTCOEX_STOMP_ALL :
 190                               btcoex->bt_stomp_type);
 191
 192         spin_unlock_bh(&btcoex->btcoex_lock);
 193
 194         if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
 195                 if (btcoex->hw_timer_enabled)
 196                         ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 197
 198                 timer_period = is_btscan ? btcoex->btscan_no_stomp :
 199                                            btcoex->btcoex_no_stomp;
 200                 ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, timer_period,
 201                                       timer_period * 10);
 202                 btcoex->hw_timer_enabled = true;
 203         }
 204
 205         ath9k_ps_restore(sc);
 206         mod_timer(&btcoex->period_timer, jiffies +
 207                                   msecs_to_jiffies(ATH_BTCOEX_DEF_BT_PERIOD));
 208 }
 209
 210 /*
 211  * Generic tsf based hw timer which configures weight
 212  * registers to time slice between wlan and bt traffic
 213  */
 214 static void ath_btcoex_no_stomp_timer(void *arg)
 215 {
 216         struct ath_softc *sc = (struct ath_softc *)arg;
 217         struct ath_hw *ah = sc->sc_ah;
 218         struct ath_btcoex *btcoex = &sc->btcoex;
 219         struct ath_common *common = ath9k_hw_common(ah);
 220         bool is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 221
 222         ath_dbg(common, ATH_DBG_BTCOEX,
 223                 "no stomp timer running\n");
 224
 225         ath9k_ps_wakeup(sc);
 226         spin_lock_bh(&btcoex->btcoex_lock);
 227
 228         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW || is_btscan)
 229                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 230          else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 231                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 232
 233         spin_unlock_bh(&btcoex->btcoex_lock);
 234         ath9k_ps_restore(sc);
 235 }
 236
 237 int ath_init_btcoex_timer(struct ath_softc *sc)
 238 {
 239         struct ath_btcoex *btcoex = &sc->btcoex;
 240
 241         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;
 242         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 243                 btcoex->btcoex_period / 100;
 244         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 245                                    btcoex->btcoex_period / 100;
 246
 247         setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 248                         (unsigned long) sc);
 249
 250         spin_lock_init(&btcoex->btcoex_lock);
 251
 252         btcoex->no_stomp_timer = ath_gen_timer_alloc(sc->sc_ah,
 253                         ath_btcoex_no_stomp_timer,
 254                         ath_btcoex_no_stomp_timer,
 255                         (void *) sc, AR_FIRST_NDP_TIMER);
 256
 257         if (!btcoex->no_stomp_timer)
 258                 return -ENOMEM;
 259
 260         return 0;
 261 }
 262
 263 /*
 264  * (Re)start btcoex timers
 265  */
 266 void ath9k_btcoex_timer_resume(struct ath_softc *sc)
 267 {
 268         struct ath_btcoex *btcoex = &sc->btcoex;
 269         struct ath_hw *ah = sc->sc_ah;
 270
 271         ath_dbg(ath9k_hw_common(ah), ATH_DBG_BTCOEX,
 272                 "Starting btcoex timers\n");
 273
 274         /* make sure duty cycle timer is also stopped when resuming */
 275         if (btcoex->hw_timer_enabled)
 276                 ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);
 277
 278         btcoex->bt_priority_cnt = 0;
 279         btcoex->bt_priority_time = jiffies;
 280         sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 281
 282         mod_timer(&btcoex->period_timer, jiffies);
 283 }
 284
 285
 286 /*
 287  * Pause btcoex timer and bt duty cycle timer
 288  */
 289 void ath9k_btcoex_timer_pause(struct ath_softc *sc)
 290 {
 291         struct ath_btcoex *btcoex = &sc->btcoex;
 292         struct ath_hw *ah = sc->sc_ah;
 293
 294         del_timer_sync(&btcoex->period_timer);
 295
 296         if (btcoex->hw_timer_enabled)
 297                 ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 298
 299         btcoex->hw_timer_enabled = false;
 300 }