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

   1 /*
   2  * Copyright (c) 2010-2011 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 "htc.h"
  18
  19 /******************/
  20 /*     BTCOEX     */
  21 /******************/
  22
  23 /*
  24  * Detects if there is any priority bt traffic
  25  */
  26 static void ath_detect_bt_priority(struct ath9k_htc_priv *priv)
  27 {
  28         struct ath_btcoex *btcoex = &priv->btcoex;
  29         struct ath_hw *ah = priv->ah;
  30
  31         if (ath9k_hw_gpio_get(ah, ah->btcoex_hw.btpriority_gpio))
  32                 btcoex->bt_priority_cnt++;
  33
  34         if (time_after(jiffies, btcoex->bt_priority_time +
  35                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
  36                 priv->op_flags &= ~(OP_BT_PRIORITY_DETECTED | OP_BT_SCAN);
  37                 /* Detect if colocated bt started scanning */
  38                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
  39                         ath_dbg(ath9k_hw_common(ah), ATH_DBG_BTCOEX,
  40                                 "BT scan detected\n");
  41                         priv->op_flags |= (OP_BT_SCAN |
  42                                          OP_BT_PRIORITY_DETECTED);
  43                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
  44                         ath_dbg(ath9k_hw_common(ah), ATH_DBG_BTCOEX,
  45                                 "BT priority traffic detected\n");
  46                         priv->op_flags |= OP_BT_PRIORITY_DETECTED;
  47                 }
  48
  49                 btcoex->bt_priority_cnt = 0;
  50                 btcoex->bt_priority_time = jiffies;
  51         }
  52 }
  53
  54 /*
  55  * This is the master bt coex work which runs for every
  56  * 45ms, bt traffic will be given priority during 55% of this
  57  * period while wlan gets remaining 45%
  58  */
  59 static void ath_btcoex_period_work(struct work_struct *work)
  60 {
  61         struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
  62                                                    coex_period_work.work);
  63         struct ath_btcoex *btcoex = &priv->btcoex;
  64         struct ath_common *common = ath9k_hw_common(priv->ah);
  65         u32 timer_period;
  66         bool is_btscan;
  67         int ret;
  68
  69         ath_detect_bt_priority(priv);
  70
  71         is_btscan = !!(priv->op_flags & OP_BT_SCAN);
  72
  73         ret = ath9k_htc_update_cap_target(priv,
  74                                   !!(priv->op_flags & OP_BT_PRIORITY_DETECTED));
  75         if (ret) {
  76                 ath_err(common, "Unable to set BTCOEX parameters\n");
  77                 return;
  78         }
  79
  80         ath9k_hw_btcoex_bt_stomp(priv->ah, is_btscan ? ATH_BTCOEX_STOMP_ALL :
  81                         btcoex->bt_stomp_type);
  82
  83         timer_period = is_btscan ? btcoex->btscan_no_stomp :
  84                 btcoex->btcoex_no_stomp;
  85         ieee80211_queue_delayed_work(priv->hw, &priv->duty_cycle_work,
  86                                      msecs_to_jiffies(timer_period));
  87         ieee80211_queue_delayed_work(priv->hw, &priv->coex_period_work,
  88                                      msecs_to_jiffies(btcoex->btcoex_period));
  89 }
  90
  91 /*
  92  * Work to time slice between wlan and bt traffic and
  93  * configure weight registers
  94  */
  95 static void ath_btcoex_duty_cycle_work(struct work_struct *work)
  96 {
  97         struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
  98                                                    duty_cycle_work.work);
  99         struct ath_hw *ah = priv->ah;
 100         struct ath_btcoex *btcoex = &priv->btcoex;
 101         struct ath_common *common = ath9k_hw_common(ah);
 102         bool is_btscan = priv->op_flags & OP_BT_SCAN;
 103
 104         ath_dbg(common, ATH_DBG_BTCOEX,
 105                 "time slice work for bt and wlan\n");
 106
 107         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW || is_btscan)
 108                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 109         else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 110                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 111 }
 112
 113 void ath_htc_init_btcoex_work(struct ath9k_htc_priv *priv)
 114 {
 115         struct ath_btcoex *btcoex = &priv->btcoex;
 116
 117         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
 118         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 119                 btcoex->btcoex_period / 100;
 120         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 121                                    btcoex->btcoex_period / 100;
 122         INIT_DELAYED_WORK(&priv->coex_period_work, ath_btcoex_period_work);
 123         INIT_DELAYED_WORK(&priv->duty_cycle_work, ath_btcoex_duty_cycle_work);
 124 }
 125
 126 /*
 127  * (Re)start btcoex work
 128  */
 129
 130 void ath_htc_resume_btcoex_work(struct ath9k_htc_priv *priv)
 131 {
 132         struct ath_btcoex *btcoex = &priv->btcoex;
 133         struct ath_hw *ah = priv->ah;
 134
 135         ath_dbg(ath9k_hw_common(ah), ATH_DBG_BTCOEX, "Starting btcoex work\n");
 136
 137         btcoex->bt_priority_cnt = 0;
 138         btcoex->bt_priority_time = jiffies;
 139         priv->op_flags &= ~(OP_BT_PRIORITY_DETECTED | OP_BT_SCAN);
 140         ieee80211_queue_delayed_work(priv->hw, &priv->coex_period_work, 0);
 141 }
 142
 143
 144 /*
 145  * Cancel btcoex and bt duty cycle work.
 146  */
 147 void ath_htc_cancel_btcoex_work(struct ath9k_htc_priv *priv)
 148 {
 149         cancel_delayed_work_sync(&priv->coex_period_work);
 150         cancel_delayed_work_sync(&priv->duty_cycle_work);
 151 }
 152
 153 /*******/
 154 /* LED */
 155 /*******/
 156
 157 #ifdef CONFIG_MAC80211_LEDS
 158 void ath9k_led_work(struct work_struct *work)
 159 {
 160         struct ath9k_htc_priv *priv = container_of(work,
 161                                                    struct ath9k_htc_priv,
 162                                                    led_work);
 163
 164         ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin,
 165                           (priv->brightness == LED_OFF));
 166 }
 167
 168 static void ath9k_led_brightness(struct led_classdev *led_cdev,
 169                                  enum led_brightness brightness)
 170 {
 171         struct ath9k_htc_priv *priv = container_of(led_cdev,
 172                                                    struct ath9k_htc_priv,
 173                                                    led_cdev);
 174
 175         /* Not locked, but it's just a tiny green light..*/
 176         priv->brightness = brightness;
 177         ieee80211_queue_work(priv->hw, &priv->led_work);
 178 }
 179
 180 void ath9k_deinit_leds(struct ath9k_htc_priv *priv)
 181 {
 182         if (!priv->led_registered)
 183                 return;
 184
 185         ath9k_led_brightness(&priv->led_cdev, LED_OFF);
 186         led_classdev_unregister(&priv->led_cdev);
 187         cancel_work_sync(&priv->led_work);
 188 }
 189
 190 void ath9k_init_leds(struct ath9k_htc_priv *priv)
 191 {
 192         int ret;
 193
 194         if (AR_SREV_9287(priv->ah))
 195                 priv->ah->led_pin = ATH_LED_PIN_9287;
 196         else if (AR_SREV_9271(priv->ah))
 197                 priv->ah->led_pin = ATH_LED_PIN_9271;
 198         else if (AR_DEVID_7010(priv->ah))
 199                 priv->ah->led_pin = ATH_LED_PIN_7010;
 200         else
 201                 priv->ah->led_pin = ATH_LED_PIN_DEF;
 202
 203         /* Configure gpio 1 for output */
 204         ath9k_hw_cfg_output(priv->ah, priv->ah->led_pin,
 205                             AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 206         /* LED off, active low */
 207         ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin, 1);
 208
 209         snprintf(priv->led_name, sizeof(priv->led_name),
 210                 "ath9k_htc-%s", wiphy_name(priv->hw->wiphy));
 211         priv->led_cdev.name = priv->led_name;
 212         priv->led_cdev.brightness_set = ath9k_led_brightness;
 213
 214         ret = led_classdev_register(wiphy_dev(priv->hw->wiphy), &priv->led_cdev);
 215         if (ret < 0)
 216                 return;
 217
 218         INIT_WORK(&priv->led_work, ath9k_led_work);
 219         priv->led_registered = true;
 220
 221         return;
 222 }
 223 #endif
 224
 225 /*******************/
 226 /*      Rfkill     */
 227 /*******************/
 228
 229 static bool ath_is_rfkill_set(struct ath9k_htc_priv *priv)
 230 {
 231         bool is_blocked;
 232
 233         ath9k_htc_ps_wakeup(priv);
 234         is_blocked = ath9k_hw_gpio_get(priv->ah, priv->ah->rfkill_gpio) ==
 235                                                  priv->ah->rfkill_polarity;
 236         ath9k_htc_ps_restore(priv);
 237
 238         return is_blocked;
 239 }
 240
 241 void ath9k_htc_rfkill_poll_state(struct ieee80211_hw *hw)
 242 {
 243         struct ath9k_htc_priv *priv = hw->priv;
 244         bool blocked = !!ath_is_rfkill_set(priv);
 245
 246         wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
 247 }
 248
 249 void ath9k_start_rfkill_poll(struct ath9k_htc_priv *priv)
 250 {
 251         if (priv->ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 252                 wiphy_rfkill_start_polling(priv->hw->wiphy);
 253 }
 254
 255 void ath9k_htc_radio_enable(struct ieee80211_hw *hw)
 256 {
 257         struct ath9k_htc_priv *priv = hw->priv;
 258         struct ath_hw *ah = priv->ah;
 259         struct ath_common *common = ath9k_hw_common(ah);
 260         int ret;
 261         u8 cmd_rsp;
 262
 263         if (!ah->curchan)
 264                 ah->curchan = ath9k_cmn_get_curchannel(hw, ah);
 265
 266         /* Reset the HW */
 267         ret = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
 268         if (ret) {
 269                 ath_err(common,
 270                         "Unable to reset hardware; reset status %d (freq %u MHz)\n",
 271                         ret, ah->curchan->channel);
 272         }
 273
 274         ath9k_cmn_update_txpow(ah, priv->curtxpow, priv->txpowlimit,
 275                                &priv->curtxpow);
 276
 277         /* Start RX */
 278         WMI_CMD(WMI_START_RECV_CMDID);
 279         ath9k_host_rx_init(priv);
 280
 281         /* Start TX */
 282         htc_start(priv->htc);
 283         spin_lock_bh(&priv->tx.tx_lock);
 284         priv->tx.flags &= ~ATH9K_HTC_OP_TX_QUEUES_STOP;
 285         spin_unlock_bh(&priv->tx.tx_lock);
 286         ieee80211_wake_queues(hw);
 287
 288         WMI_CMD(WMI_ENABLE_INTR_CMDID);
 289
 290         /* Enable LED */
 291         ath9k_hw_cfg_output(ah, ah->led_pin,
 292                             AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 293         ath9k_hw_set_gpio(ah, ah->led_pin, 0);
 294 }
 295
 296 void ath9k_htc_radio_disable(struct ieee80211_hw *hw)
 297 {
 298         struct ath9k_htc_priv *priv = hw->priv;
 299         struct ath_hw *ah = priv->ah;
 300         struct ath_common *common = ath9k_hw_common(ah);
 301         int ret;
 302         u8 cmd_rsp;
 303
 304         ath9k_htc_ps_wakeup(priv);
 305
 306         /* Disable LED */
 307         ath9k_hw_set_gpio(ah, ah->led_pin, 1);
 308         ath9k_hw_cfg_gpio_input(ah, ah->led_pin);
 309
 310         WMI_CMD(WMI_DISABLE_INTR_CMDID);
 311
 312         /* Stop TX */
 313         ieee80211_stop_queues(hw);
 314         ath9k_htc_tx_drain(priv);
 315         WMI_CMD(WMI_DRAIN_TXQ_ALL_CMDID);
 316
 317         /* Stop RX */
 318         WMI_CMD(WMI_STOP_RECV_CMDID);
 319
 320         /* Clear the WMI event queue */
 321         ath9k_wmi_event_drain(priv);
 322
 323         /*
 324          * The MIB counters have to be disabled here,
 325          * since the target doesn't do it.
 326          */
 327         ath9k_hw_disable_mib_counters(ah);
 328
 329         if (!ah->curchan)
 330                 ah->curchan = ath9k_cmn_get_curchannel(hw, ah);
 331
 332         /* Reset the HW */
 333         ret = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
 334         if (ret) {
 335                 ath_err(common,
 336                         "Unable to reset hardware; reset status %d (freq %u MHz)\n",
 337                         ret, ah->curchan->channel);
 338         }
 339
 340         /* Disable the PHY */
 341         ath9k_hw_phy_disable(ah);
 342
 343         ath9k_htc_ps_restore(priv);
 344         ath9k_htc_setpower(priv, ATH9K_PM_FULL_SLEEP);
 345 }