drivers/net/wireless/ath/ath9k/btcoex.c - kernel/msm - Gitiles

 /*
  * Copyright (c) 2009 Atheros Communications Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */

 #include "ath9k.h"

 static const struct ath_btcoex_config ath_bt_config = { 0, true, true,
 			ATH_BT_COEX_MODE_SLOTTED, true, true, 2, 5, true };

 static const u16 ath_subsysid_tbl[] = {
 	AR9280_COEX2WIRE_SUBSYSID,
 	AT9285_COEX3WIRE_SA_SUBSYSID,
 	AT9285_COEX3WIRE_DA_SUBSYSID
 };

 /*
  * Checks the subsystem id of the device to see if it
  * supports btcoex
  */
 bool ath_btcoex_supported(u16 subsysid)
 {
 	int i;

 	if (!subsysid)
 		return false;

 	for (i = 0; i < ARRAY_SIZE(ath_subsysid_tbl); i++)
 		if (subsysid == ath_subsysid_tbl[i])
 			return true;

 	return false;
 }

 /*
  * Detects if there is any priority bt traffic
  */
 static void ath_detect_bt_priority(struct ath_softc *sc)
 {
 	struct ath_btcoex *btcoex = &sc->btcoex;

 	if (ath9k_hw_gpio_get(sc->sc_ah, sc->btcoex_info.btpriority_gpio))
 		btcoex->bt_priority_cnt++;

 	if (time_after(jiffies, btcoex->bt_priority_time +
 			msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
 		if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 			DPRINTF(sc->sc_ah, ATH_DBG_BTCOEX,
 				"BT priority traffic detected");
 			sc->sc_flags |= SC_OP_BT_PRIORITY_DETECTED;
 		} else {
 			sc->sc_flags &= ~SC_OP_BT_PRIORITY_DETECTED;
 		}

 		btcoex->bt_priority_cnt = 0;
 		btcoex->bt_priority_time = jiffies;
 	}
 }

 /*
  * Configures appropriate weight based on stomp type.
  */
 static void ath_btcoex_bt_stomp(struct ath_softc *sc,
 				struct ath_btcoex_info *btinfo,
 				int stomp_type)
 {

 	switch (stomp_type) {
 	case ATH_BTCOEX_STOMP_ALL:
 		ath_btcoex_set_weight(btinfo, AR_BT_COEX_WGHT,
 				      AR_STOMP_ALL_WLAN_WGHT);
 		break;
 	case ATH_BTCOEX_STOMP_LOW:
 		ath_btcoex_set_weight(btinfo, AR_BT_COEX_WGHT,
 				      AR_STOMP_LOW_WLAN_WGHT);
 		break;
 	case ATH_BTCOEX_STOMP_NONE:
 		ath_btcoex_set_weight(btinfo, AR_BT_COEX_WGHT,
 				      AR_STOMP_NONE_WLAN_WGHT);
 		break;
 	default:
 		DPRINTF(sc->sc_ah, ATH_DBG_BTCOEX, "Invalid Stomptype\n");
 		break;
 	}

 	ath9k_hw_btcoex_enable(sc->sc_ah);
 }

 /*
  * This is the master bt coex timer which runs for every
  * 45ms, bt traffic will be given priority during 55% of this
  * period while wlan gets remaining 45%
  */

 static void ath_btcoex_period_timer(unsigned long data)
 {
 	struct ath_softc *sc = (struct ath_softc *) data;
 	struct ath_btcoex *btcoex = &sc->btcoex;
 	struct ath_btcoex_info *btinfo = &sc->btcoex_info;

 	ath_detect_bt_priority(sc);

 	spin_lock_bh(&btcoex->btcoex_lock);

 	ath_btcoex_bt_stomp(sc, btinfo, btinfo->bt_stomp_type);

 	spin_unlock_bh(&btcoex->btcoex_lock);

 	if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
 		if (btcoex->hw_timer_enabled)
 			ath_gen_timer_stop(sc->sc_ah, btinfo->no_stomp_timer);

 		ath_gen_timer_start(sc->sc_ah,
 			btinfo->no_stomp_timer,
 			(ath9k_hw_gettsf32(sc->sc_ah) +
 				btcoex->btcoex_no_stomp),
 				btcoex->btcoex_no_stomp * 10);
 		btcoex->hw_timer_enabled = true;
 	}

 	mod_timer(&btcoex->period_timer, jiffies +
 				  msecs_to_jiffies(ATH_BTCOEX_DEF_BT_PERIOD));
 }

 /*
  * Generic tsf based hw timer which configures weight
  * registers to time slice between wlan and bt traffic
  */

 static void ath_btcoex_no_stomp_timer(void *arg)
 {
 	struct ath_softc *sc = (struct ath_softc *)arg;
 	struct ath_btcoex *btcoex = &sc->btcoex;
 	struct ath_btcoex_info *btinfo = &sc->btcoex_info;

 	DPRINTF(sc->sc_ah, ATH_DBG_BTCOEX, "no stomp timer running \n");

 	spin_lock_bh(&btcoex->btcoex_lock);

 	if (btinfo->bt_stomp_type == ATH_BTCOEX_STOMP_LOW)
 		ath_btcoex_bt_stomp(sc, btinfo, ATH_BTCOEX_STOMP_NONE);
 	 else if (btinfo->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 		ath_btcoex_bt_stomp(sc, btinfo, ATH_BTCOEX_STOMP_LOW);

 	spin_unlock_bh(&btcoex->btcoex_lock);
 }

 static int ath_init_btcoex_info(struct ath_hw *hw,
 				struct ath_btcoex_info *btcoex_info)
 {
 	struct ath_btcoex *btcoex = &hw->ah_sc->btcoex;
 	u32 i;
 	int qnum;

 	qnum = ath_tx_get_qnum(hw->ah_sc, ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_BE);

 	btcoex_info->bt_coex_mode =
 		(btcoex_info->bt_coex_mode & AR_BT_QCU_THRESH) |
 		SM(ath_bt_config.bt_time_extend, AR_BT_TIME_EXTEND) |
 		SM(ath_bt_config.bt_txstate_extend, AR_BT_TXSTATE_EXTEND) |
 		SM(ath_bt_config.bt_txframe_extend, AR_BT_TX_FRAME_EXTEND) |
 		SM(ath_bt_config.bt_mode, AR_BT_MODE) |
 		SM(ath_bt_config.bt_quiet_collision, AR_BT_QUIET) |
 		SM(ath_bt_config.bt_rxclear_polarity, AR_BT_RX_CLEAR_POLARITY) |
 		SM(ath_bt_config.bt_priority_time, AR_BT_PRIORITY_TIME) |
 		SM(ath_bt_config.bt_first_slot_time, AR_BT_FIRST_SLOT_TIME) |
 		SM(qnum, AR_BT_QCU_THRESH);

 	btcoex_info->bt_coex_mode2 =
 		SM(ath_bt_config.bt_hold_rx_clear, AR_BT_HOLD_RX_CLEAR) |
 		SM(ATH_BTCOEX_BMISS_THRESH, AR_BT_BCN_MISS_THRESH) |
 		AR_BT_DISABLE_BT_ANT;

 	btcoex_info->bt_stomp_type = ATH_BTCOEX_STOMP_LOW;

 	btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;

 	btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 		btcoex->btcoex_period / 100;

 	for (i = 0; i < 32; i++)
 		hw->hw_gen_timers.gen_timer_index[(debruijn32 << i) >> 27] = i;

 	setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 			(unsigned long) hw->ah_sc);

 	btcoex_info->no_stomp_timer = ath_gen_timer_alloc(hw,
 			ath_btcoex_no_stomp_timer,
 			ath_btcoex_no_stomp_timer,
 			(void *)hw->ah_sc, AR_FIRST_NDP_TIMER);

 	if (btcoex_info->no_stomp_timer == NULL)
 		return -ENOMEM;

 	spin_lock_init(&btcoex->btcoex_lock);

 	return 0;
 }

 int ath9k_hw_btcoex_init(struct ath_hw *ah)
 {
 	struct ath_btcoex_info *btcoex_info = &ah->ah_sc->btcoex_info;
 	int ret = 0;

 	if (btcoex_info->btcoex_scheme == ATH_BTCOEX_CFG_2WIRE) {
 		/* connect bt_active to baseband */
 		REG_CLR_BIT(ah, AR_GPIO_INPUT_EN_VAL,
 				(AR_GPIO_INPUT_EN_VAL_BT_PRIORITY_DEF |
 				 AR_GPIO_INPUT_EN_VAL_BT_FREQUENCY_DEF));

 		REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL,
 				AR_GPIO_INPUT_EN_VAL_BT_ACTIVE_BB);

 		/* Set input mux for bt_active to gpio pin */
 		REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
 				AR_GPIO_INPUT_MUX1_BT_ACTIVE,
 				btcoex_info->btactive_gpio);

 		/* Configure the desired gpio port for input */
 		ath9k_hw_cfg_gpio_input(ah, btcoex_info->btactive_gpio);
 	} else {
 		/* btcoex 3-wire */
 		REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL,
 				(AR_GPIO_INPUT_EN_VAL_BT_PRIORITY_BB |
 				 AR_GPIO_INPUT_EN_VAL_BT_ACTIVE_BB));

 		/* Set input mux for bt_prority_async and
 		 *                  bt_active_async to GPIO pins */
 		REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
 				AR_GPIO_INPUT_MUX1_BT_ACTIVE,
 				btcoex_info->btactive_gpio);

 		REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
 				AR_GPIO_INPUT_MUX1_BT_PRIORITY,
 				btcoex_info->btpriority_gpio);

 		/* Configure the desired GPIO ports for input */

 		ath9k_hw_cfg_gpio_input(ah, btcoex_info->btactive_gpio);
 		ath9k_hw_cfg_gpio_input(ah, btcoex_info->btpriority_gpio);

 		ret = ath_init_btcoex_info(ah, btcoex_info);
 	}

 	return ret;
 }

 void ath9k_hw_btcoex_enable(struct ath_hw *ah)
 {
 	struct ath_btcoex_info *btcoex_info = &ah->ah_sc->btcoex_info;

 	if (btcoex_info->btcoex_scheme == ATH_BTCOEX_CFG_2WIRE) {
 		/* Configure the desired GPIO port for TX_FRAME output */
 		ath9k_hw_cfg_output(ah, btcoex_info->wlanactive_gpio,
 				AR_GPIO_OUTPUT_MUX_AS_TX_FRAME);
 	} else {
 		/*
 		 * Program coex mode and weight registers to
 		 * enable coex 3-wire
 		 */
 		REG_WRITE(ah, AR_BT_COEX_MODE, btcoex_info->bt_coex_mode);
 		REG_WRITE(ah, AR_BT_COEX_WEIGHT, btcoex_info->bt_coex_weights);
 		REG_WRITE(ah, AR_BT_COEX_MODE2, btcoex_info->bt_coex_mode2);

 		REG_RMW_FIELD(ah, AR_QUIET1,
 				AR_QUIET1_QUIET_ACK_CTS_ENABLE, 1);
 		REG_RMW_FIELD(ah, AR_PCU_MISC,
 				AR_PCU_BT_ANT_PREVENT_RX, 0);

 		ath9k_hw_cfg_output(ah, btcoex_info->wlanactive_gpio,
 				AR_GPIO_OUTPUT_MUX_AS_RX_CLEAR_EXTERNAL);
 	}

 	REG_RMW(ah, AR_GPIO_PDPU,
 		(0x2 << (btcoex_info->btactive_gpio * 2)),
 		(0x3 << (btcoex_info->btactive_gpio * 2)));

 	ah->ah_sc->sc_flags |= SC_OP_BTCOEX_ENABLED;
 }

 void ath9k_hw_btcoex_disable(struct ath_hw *ah)
 {
 	struct ath_btcoex_info *btcoex_info = &ah->ah_sc->btcoex_info;

 	ath9k_hw_set_gpio(ah, btcoex_info->wlanactive_gpio, 0);

 	ath9k_hw_cfg_output(ah, btcoex_info->wlanactive_gpio,
 			AR_GPIO_OUTPUT_MUX_AS_OUTPUT);

 	if (btcoex_info->btcoex_scheme == ATH_BTCOEX_CFG_3WIRE) {
 		REG_WRITE(ah, AR_BT_COEX_MODE, AR_BT_QUIET | AR_BT_MODE);
 		REG_WRITE(ah, AR_BT_COEX_WEIGHT, 0);
 		REG_WRITE(ah, AR_BT_COEX_MODE2, 0);
 	}

 	ah->ah_sc->sc_flags &= ~SC_OP_BTCOEX_ENABLED;
 }

 /*
  * Pause btcoex timer and bt duty cycle timer
  */
 void ath_btcoex_timer_pause(struct ath_softc *sc)
 {
 	struct ath_btcoex *btcoex = &sc->btcoex;

 	del_timer_sync(&btcoex->period_timer);

 	if (btcoex->hw_timer_enabled)
 		ath_gen_timer_stop(sc->sc_ah, sc->btcoex_info.no_stomp_timer);

 	btcoex->hw_timer_enabled = false;
 }

 /*
  * (Re)start btcoex timers
  */
 void ath_btcoex_timer_resume(struct ath_softc *sc)
 {
 	struct ath_btcoex *btcoex = &sc->btcoex;

 	DPRINTF(sc->sc_ah, ATH_DBG_BTCOEX, "Starting btcoex timers");

 	/* make sure duty cycle timer is also stopped when resuming */
 	if (btcoex->hw_timer_enabled)
 		ath_gen_timer_stop(sc->sc_ah, sc->btcoex_info.no_stomp_timer);

 	btcoex->bt_priority_cnt = 0;
 	btcoex->bt_priority_time = jiffies;
 	sc->sc_flags &= ~SC_OP_BT_PRIORITY_DETECTED;

 	mod_timer(&btcoex->period_timer, jiffies);
 }
	/*
	* Copyright (c) 2009 Atheros Communications Inc.
	*
	* Permission to use, copy, modify, and/or distribute this software for any
	* purpose with or without fee is hereby granted, provided that the above
	* copyright notice and this permission notice appear in all copies.
	*
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	*/

	#include "ath9k.h"

	static const struct ath_btcoex_config ath_bt_config = { 0, true, true,
	ATH_BT_COEX_MODE_SLOTTED, true, true, 2, 5, true };

	static const u16 ath_subsysid_tbl[] = {
	AR9280_COEX2WIRE_SUBSYSID,
	AT9285_COEX3WIRE_SA_SUBSYSID,
	AT9285_COEX3WIRE_DA_SUBSYSID
	};

	/*
	* Checks the subsystem id of the device to see if it
	* supports btcoex
	*/
	bool ath_btcoex_supported(u16 subsysid)
	{
	int i;

	if (!subsysid)
	return false;

	for (i = 0; i < ARRAY_SIZE(ath_subsysid_tbl); i++)
	if (subsysid == ath_subsysid_tbl[i])
	return true;

	return false;
	}

	/*
	* Detects if there is any priority bt traffic
	*/
	static void ath_detect_bt_priority(struct ath_softc *sc)
	{
	struct ath_btcoex *btcoex = &sc->btcoex;

	if (ath9k_hw_gpio_get(sc->sc_ah, sc->btcoex_info.btpriority_gpio))
	btcoex->bt_priority_cnt++;

	if (time_after(jiffies, btcoex->bt_priority_time +
	msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
	if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
	DPRINTF(sc->sc_ah, ATH_DBG_BTCOEX,
	"BT priority traffic detected");
	sc->sc_flags \|= SC_OP_BT_PRIORITY_DETECTED;
	} else {
	sc->sc_flags &= ~SC_OP_BT_PRIORITY_DETECTED;
	}

	btcoex->bt_priority_cnt = 0;
	btcoex->bt_priority_time = jiffies;
	}
	}

	/*
	* Configures appropriate weight based on stomp type.
	*/
	static void ath_btcoex_bt_stomp(struct ath_softc *sc,
	struct ath_btcoex_info *btinfo,
	int stomp_type)
	{

	switch (stomp_type) {
	case ATH_BTCOEX_STOMP_ALL:
	ath_btcoex_set_weight(btinfo, AR_BT_COEX_WGHT,
	AR_STOMP_ALL_WLAN_WGHT);
	break;
	case ATH_BTCOEX_STOMP_LOW:
	ath_btcoex_set_weight(btinfo, AR_BT_COEX_WGHT,
	AR_STOMP_LOW_WLAN_WGHT);
	break;
	case ATH_BTCOEX_STOMP_NONE:
	ath_btcoex_set_weight(btinfo, AR_BT_COEX_WGHT,
	AR_STOMP_NONE_WLAN_WGHT);
	break;
	default:
	DPRINTF(sc->sc_ah, ATH_DBG_BTCOEX, "Invalid Stomptype\n");
	break;
	}

	ath9k_hw_btcoex_enable(sc->sc_ah);
	}

	/*
	* This is the master bt coex timer which runs for every
	* 45ms, bt traffic will be given priority during 55% of this
	* period while wlan gets remaining 45%
	*/

	static void ath_btcoex_period_timer(unsigned long data)
	{
	struct ath_softc sc = (struct ath_softc ) data;
	struct ath_btcoex *btcoex = &sc->btcoex;
	struct ath_btcoex_info *btinfo = &sc->btcoex_info;

	ath_detect_bt_priority(sc);

	spin_lock_bh(&btcoex->btcoex_lock);

	ath_btcoex_bt_stomp(sc, btinfo, btinfo->bt_stomp_type);

	spin_unlock_bh(&btcoex->btcoex_lock);

	if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
	if (btcoex->hw_timer_enabled)
	ath_gen_timer_stop(sc->sc_ah, btinfo->no_stomp_timer);

	ath_gen_timer_start(sc->sc_ah,
	btinfo->no_stomp_timer,
	(ath9k_hw_gettsf32(sc->sc_ah) +
	btcoex->btcoex_no_stomp),
	btcoex->btcoex_no_stomp * 10);
	btcoex->hw_timer_enabled = true;
	}

	mod_timer(&btcoex->period_timer, jiffies +
	msecs_to_jiffies(ATH_BTCOEX_DEF_BT_PERIOD));
	}

	/*
	* Generic tsf based hw timer which configures weight
	* registers to time slice between wlan and bt traffic
	*/

	static void ath_btcoex_no_stomp_timer(void *arg)
	{
	struct ath_softc sc = (struct ath_softc )arg;
	struct ath_btcoex *btcoex = &sc->btcoex;
	struct ath_btcoex_info *btinfo = &sc->btcoex_info;

	DPRINTF(sc->sc_ah, ATH_DBG_BTCOEX, "no stomp timer running \n");

	spin_lock_bh(&btcoex->btcoex_lock);

	if (btinfo->bt_stomp_type == ATH_BTCOEX_STOMP_LOW)
	ath_btcoex_bt_stomp(sc, btinfo, ATH_BTCOEX_STOMP_NONE);
	else if (btinfo->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
	ath_btcoex_bt_stomp(sc, btinfo, ATH_BTCOEX_STOMP_LOW);

	spin_unlock_bh(&btcoex->btcoex_lock);
	}

	static int ath_init_btcoex_info(struct ath_hw *hw,
	struct ath_btcoex_info *btcoex_info)
	{
	struct ath_btcoex *btcoex = &hw->ah_sc->btcoex;
	u32 i;
	int qnum;

	qnum = ath_tx_get_qnum(hw->ah_sc, ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_BE);

	btcoex_info->bt_coex_mode =
	(btcoex_info->bt_coex_mode & AR_BT_QCU_THRESH) \|
	SM(ath_bt_config.bt_time_extend, AR_BT_TIME_EXTEND) \|
	SM(ath_bt_config.bt_txstate_extend, AR_BT_TXSTATE_EXTEND) \|
	SM(ath_bt_config.bt_txframe_extend, AR_BT_TX_FRAME_EXTEND) \|
	SM(ath_bt_config.bt_mode, AR_BT_MODE) \|
	SM(ath_bt_config.bt_quiet_collision, AR_BT_QUIET) \|
	SM(ath_bt_config.bt_rxclear_polarity, AR_BT_RX_CLEAR_POLARITY) \|
	SM(ath_bt_config.bt_priority_time, AR_BT_PRIORITY_TIME) \|
	SM(ath_bt_config.bt_first_slot_time, AR_BT_FIRST_SLOT_TIME) \|
	SM(qnum, AR_BT_QCU_THRESH);

	btcoex_info->bt_coex_mode2 =
	SM(ath_bt_config.bt_hold_rx_clear, AR_BT_HOLD_RX_CLEAR) \|
	SM(ATH_BTCOEX_BMISS_THRESH, AR_BT_BCN_MISS_THRESH) \|
	AR_BT_DISABLE_BT_ANT;

	btcoex_info->bt_stomp_type = ATH_BTCOEX_STOMP_LOW;

	btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;

	btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
	btcoex->btcoex_period / 100;

	for (i = 0; i < 32; i++)
	hw->hw_gen_timers.gen_timer_index[(debruijn32 << i) >> 27] = i;

	setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
	(unsigned long) hw->ah_sc);

	btcoex_info->no_stomp_timer = ath_gen_timer_alloc(hw,
	ath_btcoex_no_stomp_timer,
	ath_btcoex_no_stomp_timer,
	(void *)hw->ah_sc, AR_FIRST_NDP_TIMER);

	if (btcoex_info->no_stomp_timer == NULL)
	return -ENOMEM;

	spin_lock_init(&btcoex->btcoex_lock);

	return 0;
	}

	int ath9k_hw_btcoex_init(struct ath_hw *ah)
	{
	struct ath_btcoex_info *btcoex_info = &ah->ah_sc->btcoex_info;
	int ret = 0;

	if (btcoex_info->btcoex_scheme == ATH_BTCOEX_CFG_2WIRE) {
	/* connect bt_active to baseband */
	REG_CLR_BIT(ah, AR_GPIO_INPUT_EN_VAL,
	(AR_GPIO_INPUT_EN_VAL_BT_PRIORITY_DEF \|
	AR_GPIO_INPUT_EN_VAL_BT_FREQUENCY_DEF));

	REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL,
	AR_GPIO_INPUT_EN_VAL_BT_ACTIVE_BB);

	/* Set input mux for bt_active to gpio pin */
	REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
	AR_GPIO_INPUT_MUX1_BT_ACTIVE,
	btcoex_info->btactive_gpio);

	/* Configure the desired gpio port for input */
	ath9k_hw_cfg_gpio_input(ah, btcoex_info->btactive_gpio);
	} else {
	/* btcoex 3-wire */
	REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL,
	(AR_GPIO_INPUT_EN_VAL_BT_PRIORITY_BB \|
	AR_GPIO_INPUT_EN_VAL_BT_ACTIVE_BB));

	/* Set input mux for bt_prority_async and
	* bt_active_async to GPIO pins */
	REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
	AR_GPIO_INPUT_MUX1_BT_ACTIVE,
	btcoex_info->btactive_gpio);

	REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
	AR_GPIO_INPUT_MUX1_BT_PRIORITY,
	btcoex_info->btpriority_gpio);

	/* Configure the desired GPIO ports for input */

	ath9k_hw_cfg_gpio_input(ah, btcoex_info->btactive_gpio);
	ath9k_hw_cfg_gpio_input(ah, btcoex_info->btpriority_gpio);

	ret = ath_init_btcoex_info(ah, btcoex_info);
	}

	return ret;
	}

	void ath9k_hw_btcoex_enable(struct ath_hw *ah)
	{
	struct ath_btcoex_info *btcoex_info = &ah->ah_sc->btcoex_info;

	if (btcoex_info->btcoex_scheme == ATH_BTCOEX_CFG_2WIRE) {
	/* Configure the desired GPIO port for TX_FRAME output */
	ath9k_hw_cfg_output(ah, btcoex_info->wlanactive_gpio,
	AR_GPIO_OUTPUT_MUX_AS_TX_FRAME);
	} else {
	/*
	* Program coex mode and weight registers to
	* enable coex 3-wire
	*/
	REG_WRITE(ah, AR_BT_COEX_MODE, btcoex_info->bt_coex_mode);
	REG_WRITE(ah, AR_BT_COEX_WEIGHT, btcoex_info->bt_coex_weights);
	REG_WRITE(ah, AR_BT_COEX_MODE2, btcoex_info->bt_coex_mode2);

	REG_RMW_FIELD(ah, AR_QUIET1,
	AR_QUIET1_QUIET_ACK_CTS_ENABLE, 1);
	REG_RMW_FIELD(ah, AR_PCU_MISC,
	AR_PCU_BT_ANT_PREVENT_RX, 0);

	ath9k_hw_cfg_output(ah, btcoex_info->wlanactive_gpio,
	AR_GPIO_OUTPUT_MUX_AS_RX_CLEAR_EXTERNAL);
	}

	REG_RMW(ah, AR_GPIO_PDPU,
	(0x2 << (btcoex_info->btactive_gpio * 2)),
	(0x3 << (btcoex_info->btactive_gpio * 2)));

	ah->ah_sc->sc_flags \|= SC_OP_BTCOEX_ENABLED;
	}

	void ath9k_hw_btcoex_disable(struct ath_hw *ah)
	{
	struct ath_btcoex_info *btcoex_info = &ah->ah_sc->btcoex_info;

	ath9k_hw_set_gpio(ah, btcoex_info->wlanactive_gpio, 0);

	ath9k_hw_cfg_output(ah, btcoex_info->wlanactive_gpio,
	AR_GPIO_OUTPUT_MUX_AS_OUTPUT);

	if (btcoex_info->btcoex_scheme == ATH_BTCOEX_CFG_3WIRE) {
	REG_WRITE(ah, AR_BT_COEX_MODE, AR_BT_QUIET \| AR_BT_MODE);
	REG_WRITE(ah, AR_BT_COEX_WEIGHT, 0);
	REG_WRITE(ah, AR_BT_COEX_MODE2, 0);
	}

	ah->ah_sc->sc_flags &= ~SC_OP_BTCOEX_ENABLED;
	}

	/*
	* Pause btcoex timer and bt duty cycle timer
	*/
	void ath_btcoex_timer_pause(struct ath_softc *sc)
	{
	struct ath_btcoex *btcoex = &sc->btcoex;

	del_timer_sync(&btcoex->period_timer);

	if (btcoex->hw_timer_enabled)
	ath_gen_timer_stop(sc->sc_ah, sc->btcoex_info.no_stomp_timer);

	btcoex->hw_timer_enabled = false;
	}

	/*
	* (Re)start btcoex timers
	*/
	void ath_btcoex_timer_resume(struct ath_softc *sc)
	{
	struct ath_btcoex *btcoex = &sc->btcoex;

	DPRINTF(sc->sc_ah, ATH_DBG_BTCOEX, "Starting btcoex timers");

	/* make sure duty cycle timer is also stopped when resuming */
	if (btcoex->hw_timer_enabled)
	ath_gen_timer_stop(sc->sc_ah, sc->btcoex_info.no_stomp_timer);

	btcoex->bt_priority_cnt = 0;
	btcoex->bt_priority_time = jiffies;
	sc->sc_flags &= ~SC_OP_BT_PRIORITY_DETECTED;

	mod_timer(&btcoex->period_timer, jiffies);
	}