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 if (AR_SREV_9480(sc->sc_ah))
  52                         sc->sc_ah->led_pin = ATH_LED_PIN_9480;
  53                 else
  54                         sc->sc_ah->led_pin = ATH_LED_PIN_DEF;
  55         }
  56
  57         /* Configure gpio 1 for output */
  58         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_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_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 /******************/
 114 /*     BTCOEX     */
 115 /******************/
 116
 117 /*
 118  * Detects if there is any priority bt traffic
 119  */
 120 static void ath_detect_bt_priority(struct ath_softc *sc)
 121 {
 122         struct ath_btcoex *btcoex = &sc->btcoex;
 123         struct ath_hw *ah = sc->sc_ah;
 124
 125         if (ath9k_hw_gpio_get(sc->sc_ah, ah->btcoex_hw.btpriority_gpio))
 126                 btcoex->bt_priority_cnt++;
 127
 128         if (time_after(jiffies, btcoex->bt_priority_time +
 129                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
 130                 sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 131                 /* Detect if colocated bt started scanning */
 132                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 133                         ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
 134                                 "BT scan detected\n");
 135                         sc->sc_flags |= (SC_OP_BT_SCAN |
 136                                          SC_OP_BT_PRIORITY_DETECTED);
 137                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 138                         ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
 139                                 "BT priority traffic detected\n");
 140                         sc->sc_flags |= SC_OP_BT_PRIORITY_DETECTED;
 141                 }
 142
 143                 btcoex->bt_priority_cnt = 0;
 144                 btcoex->bt_priority_time = jiffies;
 145         }
 146 }
 147
 148 static void ath9k_gen_timer_start(struct ath_hw *ah,
 149                                   struct ath_gen_timer *timer,
 150                                   u32 trig_timeout,
 151                                   u32 timer_period)
 152 {
 153         ath9k_hw_gen_timer_start(ah, timer, trig_timeout, timer_period);
 154
 155         if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
 156                 ath9k_hw_disable_interrupts(ah);
 157                 ah->imask |= ATH9K_INT_GENTIMER;
 158                 ath9k_hw_set_interrupts(ah, ah->imask);
 159                 ath9k_hw_enable_interrupts(ah);
 160         }
 161 }
 162
 163 static void ath9k_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer)
 164 {
 165         struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;
 166
 167         ath9k_hw_gen_timer_stop(ah, timer);
 168
 169         /* if no timer is enabled, turn off interrupt mask */
 170         if (timer_table->timer_mask.val == 0) {
 171                 ath9k_hw_disable_interrupts(ah);
 172                 ah->imask &= ~ATH9K_INT_GENTIMER;
 173                 ath9k_hw_set_interrupts(ah, ah->imask);
 174                 ath9k_hw_enable_interrupts(ah);
 175         }
 176 }
 177
 178 /*
 179  * This is the master bt coex timer which runs for every
 180  * 45ms, bt traffic will be given priority during 55% of this
 181  * period while wlan gets remaining 45%
 182  */
 183 static void ath_btcoex_period_timer(unsigned long data)
 184 {
 185         struct ath_softc *sc = (struct ath_softc *) data;
 186         struct ath_hw *ah = sc->sc_ah;
 187         struct ath_btcoex *btcoex = &sc->btcoex;
 188         u32 timer_period;
 189         bool is_btscan;
 190
 191         ath9k_ps_wakeup(sc);
 192         ath_detect_bt_priority(sc);
 193
 194         is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 195
 196         spin_lock_bh(&btcoex->btcoex_lock);
 197
 198         ath9k_hw_btcoex_bt_stomp(ah, is_btscan ? ATH_BTCOEX_STOMP_ALL :
 199                               btcoex->bt_stomp_type);
 200
 201         spin_unlock_bh(&btcoex->btcoex_lock);
 202
 203         if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
 204                 if (btcoex->hw_timer_enabled)
 205                         ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 206
 207                 timer_period = is_btscan ? btcoex->btscan_no_stomp :
 208                                            btcoex->btcoex_no_stomp;
 209                 ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, timer_period,
 210                                       timer_period * 10);
 211                 btcoex->hw_timer_enabled = true;
 212         }
 213
 214         ath9k_ps_restore(sc);
 215         mod_timer(&btcoex->period_timer, jiffies +
 216                                   msecs_to_jiffies(ATH_BTCOEX_DEF_BT_PERIOD));
 217 }
 218
 219 /*
 220  * Generic tsf based hw timer which configures weight
 221  * registers to time slice between wlan and bt traffic
 222  */
 223 static void ath_btcoex_no_stomp_timer(void *arg)
 224 {
 225         struct ath_softc *sc = (struct ath_softc *)arg;
 226         struct ath_hw *ah = sc->sc_ah;
 227         struct ath_btcoex *btcoex = &sc->btcoex;
 228         struct ath_common *common = ath9k_hw_common(ah);
 229         bool is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 230
 231         ath_dbg(common, ATH_DBG_BTCOEX,
 232                 "no stomp timer running\n");
 233
 234         ath9k_ps_wakeup(sc);
 235         spin_lock_bh(&btcoex->btcoex_lock);
 236
 237         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW || is_btscan)
 238                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 239          else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 240                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 241
 242         spin_unlock_bh(&btcoex->btcoex_lock);
 243         ath9k_ps_restore(sc);
 244 }
 245
 246 int ath_init_btcoex_timer(struct ath_softc *sc)
 247 {
 248         struct ath_btcoex *btcoex = &sc->btcoex;
 249
 250         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;
 251         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 252                 btcoex->btcoex_period / 100;
 253         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 254                                    btcoex->btcoex_period / 100;
 255
 256         setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 257                         (unsigned long) sc);
 258
 259         spin_lock_init(&btcoex->btcoex_lock);
 260
 261         btcoex->no_stomp_timer = ath_gen_timer_alloc(sc->sc_ah,
 262                         ath_btcoex_no_stomp_timer,
 263                         ath_btcoex_no_stomp_timer,
 264                         (void *) sc, AR_FIRST_NDP_TIMER);
 265
 266         if (!btcoex->no_stomp_timer)
 267                 return -ENOMEM;
 268
 269         return 0;
 270 }
 271
 272 /*
 273  * (Re)start btcoex timers
 274  */
 275 void ath9k_btcoex_timer_resume(struct ath_softc *sc)
 276 {
 277         struct ath_btcoex *btcoex = &sc->btcoex;
 278         struct ath_hw *ah = sc->sc_ah;
 279
 280         ath_dbg(ath9k_hw_common(ah), ATH_DBG_BTCOEX,
 281                 "Starting btcoex timers\n");
 282
 283         /* make sure duty cycle timer is also stopped when resuming */
 284         if (btcoex->hw_timer_enabled)
 285                 ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);
 286
 287         btcoex->bt_priority_cnt = 0;
 288         btcoex->bt_priority_time = jiffies;
 289         sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 290
 291         mod_timer(&btcoex->period_timer, jiffies);
 292 }
 293
 294
 295 /*
 296  * Pause btcoex timer and bt duty cycle timer
 297  */
 298 void ath9k_btcoex_timer_pause(struct ath_softc *sc)
 299 {
 300         struct ath_btcoex *btcoex = &sc->btcoex;
 301         struct ath_hw *ah = sc->sc_ah;
 302
 303         del_timer_sync(&btcoex->period_timer);
 304
 305         if (btcoex->hw_timer_enabled)
 306                 ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 307
 308         btcoex->hw_timer_enabled = false;
 309 }