LXR linux/drivers/net/wireless/ath/ath9k/htc_drv

   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 */
  26static 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 */
  59static 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 */
  95static 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
 113void 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
 130void 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 */
 147void 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
 158void 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
 168static 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
 180void 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
 190void 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
 229static bool ath_is_rfkill_set(struct ath9k_htc_priv *priv)
 230{
 231        return ath9k_hw_gpio_get(priv->ah, priv->ah->rfkill_gpio) ==
 232                priv->ah->rfkill_polarity;
 233}
 234
 235void ath9k_htc_rfkill_poll_state(struct ieee80211_hw *hw)
 236{
 237        struct ath9k_htc_priv *priv = hw->priv;
 238        bool blocked = !!ath_is_rfkill_set(priv);
 239
 240        wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
 241}
 242
 243void ath9k_start_rfkill_poll(struct ath9k_htc_priv *priv)
 244{
 245        if (priv->ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 246                wiphy_rfkill_start_polling(priv->hw->wiphy);
 247}
 248
 249void ath9k_htc_radio_enable(struct ieee80211_hw *hw)
 250{
 251        struct ath9k_htc_priv *priv = hw->priv;
 252        struct ath_hw *ah = priv->ah;
 253        struct ath_common *common = ath9k_hw_common(ah);
 254        int ret;
 255        u8 cmd_rsp;
 256
 257        if (!ah->curchan)
 258                ah->curchan = ath9k_cmn_get_curchannel(hw, ah);
 259
 260        /* Reset the HW */
 261        ret = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
 262        if (ret) {
 263                ath_err(common,
 264                        "Unable to reset hardware; reset status %d (freq %u MHz)\n",
 265                        ret, ah->curchan->channel);
 266        }
 267
 268        ath9k_cmn_update_txpow(ah, priv->curtxpow, priv->txpowlimit,
 269                               &priv->curtxpow);
 270
 271        /* Start RX */
 272        WMI_CMD(WMI_START_RECV_CMDID);
 273        ath9k_host_rx_init(priv);
 274
 275        /* Start TX */
 276        htc_start(priv->htc);
 277        spin_lock_bh(&priv->tx.tx_lock);
 278        priv->tx.flags &= ~ATH9K_HTC_OP_TX_QUEUES_STOP;
 279        spin_unlock_bh(&priv->tx.tx_lock);
 280        ieee80211_wake_queues(hw);
 281
 282        WMI_CMD(WMI_ENABLE_INTR_CMDID);
 283
 284        /* Enable LED */
 285        ath9k_hw_cfg_output(ah, ah->led_pin,
 286                            AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 287        ath9k_hw_set_gpio(ah, ah->led_pin, 0);
 288}
 289
 290void ath9k_htc_radio_disable(struct ieee80211_hw *hw)
 291{
 292        struct ath9k_htc_priv *priv = hw->priv;
 293        struct ath_hw *ah = priv->ah;
 294        struct ath_common *common = ath9k_hw_common(ah);
 295        int ret;
 296        u8 cmd_rsp;
 297
 298        ath9k_htc_ps_wakeup(priv);
 299
 300        /* Disable LED */
 301        ath9k_hw_set_gpio(ah, ah->led_pin, 1);
 302        ath9k_hw_cfg_gpio_input(ah, ah->led_pin);
 303
 304        WMI_CMD(WMI_DISABLE_INTR_CMDID);
 305
 306        /* Stop TX */
 307        ieee80211_stop_queues(hw);
 308        ath9k_htc_tx_drain(priv);
 309        WMI_CMD(WMI_DRAIN_TXQ_ALL_CMDID);
 310
 311        /* Stop RX */
 312        WMI_CMD(WMI_STOP_RECV_CMDID);
 313
 314        /* Clear the WMI event queue */
 315        ath9k_wmi_event_drain(priv);
 316
 317        /*
 318         * The MIB counters have to be disabled here,
 319         * since the target doesn't do it.
 320         */
 321        ath9k_hw_disable_mib_counters(ah);
 322
 323        if (!ah->curchan)
 324                ah->curchan = ath9k_cmn_get_curchannel(hw, ah);
 325
 326        /* Reset the HW */
 327        ret = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
 328        if (ret) {
 329                ath_err(common,
 330                        "Unable to reset hardware; reset status %d (freq %u MHz)\n",
 331                        ret, ah->curchan->channel);
 332        }
 333
 334        /* Disable the PHY */
 335        ath9k_hw_phy_disable(ah);
 336
 337        ath9k_htc_ps_restore(priv);
 338        ath9k_htc_setpower(priv, ATH9K_PM_FULL_SLEEP);
 339}
 340