ath9k: Add Bluetooth Coexistence 3-wire support
This patch adds 3-wire bluetooth coex support for AR9285.
This support can be enabled through btcoex_enable modparam.
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/btcoex.c b/drivers/net/wireless/ath/ath9k/btcoex.c
index 9f19cd1..8fb3567 100644
--- a/drivers/net/wireless/ath/ath9k/btcoex.c
+++ b/drivers/net/wireless/ath/ath9k/btcoex.c
@@ -16,34 +16,251 @@
#include "ath9k.h"
-void ath9k_hw_btcoex_init(struct ath_hw *ah)
+static const struct ath_btcoex_config ath_bt_config = { 0, true, true,
+ ATH_BT_COEX_MODE_SLOTTED, true, true, 2, 5, true };
+
+
+/*
+ * Detects if there is any priority bt traffic
+ */
+static void ath_detect_bt_priority(struct ath_softc *sc)
+{
+ struct ath_btcoex_info *btinfo = &sc->btcoex_info;
+
+ if (ath9k_hw_gpio_get(sc->sc_ah, btinfo->btpriority_gpio))
+ btinfo->bt_priority_cnt++;
+
+ if (time_after(jiffies, btinfo->bt_priority_time +
+ msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
+ if (btinfo->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
+ DPRINTF(sc, ATH_DBG_BTCOEX,
+ "BT priority traffic detected");
+ sc->sc_flags |= SC_OP_BT_PRIORITY_DETECTED;
+ } else {
+ sc->sc_flags &= ~SC_OP_BT_PRIORITY_DETECTED;
+ }
+
+ btinfo->bt_priority_cnt = 0;
+ btinfo->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, 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_info *btinfo = &sc->btcoex_info;
+ unsigned long flags;
+
+ ath_detect_bt_priority(sc);
+
+ spin_lock_irqsave(&btinfo->btcoex_lock, flags);
+
+ ath_btcoex_bt_stomp(sc, btinfo, btinfo->bt_stomp_type);
+
+ spin_unlock_irqrestore(&btinfo->btcoex_lock, flags);
+
+ if (btinfo->btcoex_period != btinfo->btcoex_no_stomp) {
+ if (btinfo->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) +
+ btinfo->btcoex_no_stomp),
+ btinfo->btcoex_no_stomp * 10);
+ btinfo->hw_timer_enabled = true;
+ }
+
+ mod_timer(&btinfo->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_info *btinfo = &sc->btcoex_info;
+ unsigned long flags;
+
+ DPRINTF(sc, ATH_DBG_BTCOEX, "no stomp timer running \n");
+
+ spin_lock_irqsave(&btinfo->btcoex_lock, flags);
+
+ 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_irqrestore(&btinfo->btcoex_lock, flags);
+}
+
+static int ath_init_btcoex_info(struct ath_hw *hw,
+ struct ath_btcoex_info *btcoex_info)
+{
+ 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_info->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;
+
+ btcoex_info->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
+ btcoex_info->btcoex_period / 100;
+
+ for (i = 0; i < 32; i++)
+ hw->hw_gen_timers.gen_timer_index[(debruijn32 << i) >> 27] = i;
+
+ setup_timer(&btcoex_info->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_info->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;
- /* 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));
+ 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);
+ 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);
+ /* 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);
+ /* 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;
- /* 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);
+ 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;
}
@@ -57,5 +274,46 @@
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_info *btinfo)
+{
+
+ del_timer_sync(&btinfo->period_timer);
+
+ if (btinfo->hw_timer_enabled)
+ ath_gen_timer_stop(sc->sc_ah, btinfo->no_stomp_timer);
+
+ btinfo->hw_timer_enabled = false;
+}
+
+/*
+ * (Re)start btcoex timers
+ */
+void ath_btcoex_timer_resume(struct ath_softc *sc,
+ struct ath_btcoex_info *btinfo)
+{
+
+ DPRINTF(sc, ATH_DBG_BTCOEX, "Starting btcoex timers");
+
+ /* make sure duty cycle timer is also stopped when resuming */
+ if (btinfo->hw_timer_enabled)
+ ath_gen_timer_stop(sc->sc_ah, btinfo->no_stomp_timer);
+
+ btinfo->bt_priority_cnt = 0;
+ btinfo->bt_priority_time = jiffies;
+ sc->sc_flags &= ~SC_OP_BT_PRIORITY_DETECTED;
+
+ mod_timer(&btinfo->period_timer, jiffies);
+}