ath9k_hw: make bluetooth coexistence support optional at compile time

Many systems (e.g. embedded systems) do not have wifi modules connected to
bluetooth modules, so bluetooth coexistence is irrelevant there. With the
addition of MCI support, ath9k picked up quite a bit of extra code that
can be compiled out this way.

This patch redefines ATH9K_HW_CAP_MCI and adds an inline wrapper for
querying the bluetooth coexistence scheme, allowing the compiler to
eliminate code that uses it, with only very little use of #ifdef.

On MIPS this reduces the total size for the modules by about 20k.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 23 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath/ath9k/btcoex.c b/drivers/net/wireless/ath/ath9k/btcoex.c
index 553d279cc5ee..a6712a95d76a 100644
--- a/drivers/net/wireless/ath/ath9k/btcoex.c
+++ b/drivers/net/wireless/ath/ath9k/btcoex.c
@@ -68,6 +68,9 @@ void ath9k_hw_init_btcoex_hw(struct ath_hw *ah, int qnum)
         u32 i, idx;
         bool rxclear_polarity = ath_bt_config.bt_rxclear_polarity;
 
+        if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
+                return;
+
         if (AR_SREV_9300_20_OR_LATER(ah))
                 rxclear_polarity = !ath_bt_config.bt_rxclear_polarity;
 
@@ -99,6 +102,9 @@ void ath9k_hw_btcoex_init_2wire(struct ath_hw *ah)
 {
         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 
+        if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
+                return;
+
         /* connect bt_active to baseband */
         REG_CLR_BIT(ah, AR_GPIO_INPUT_EN_VAL,
                     (AR_GPIO_INPUT_EN_VAL_BT_PRIORITY_DEF |
@@ -121,6 +127,9 @@ void ath9k_hw_btcoex_init_3wire(struct ath_hw *ah)
 {
         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 
+        if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
+                return;
+
         /* btcoex 3-wire */
         REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL,
                         (AR_GPIO_INPUT_EN_VAL_BT_PRIORITY_BB |
@@ -147,6 +156,9 @@ static void ath9k_hw_btcoex_enable_2wire(struct ath_hw *ah)
 {
         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 
+        if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
+                return;
+
         /* Configure the desired GPIO port for TX_FRAME output */
         ath9k_hw_cfg_output(ah, btcoex_hw->wlanactive_gpio,
                             AR_GPIO_OUTPUT_MUX_AS_TX_FRAME);
@@ -158,6 +170,9 @@ void ath9k_hw_btcoex_set_weight(struct ath_hw *ah,
 {
         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 
+        if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
+                return;
+
         btcoex_hw->bt_coex_weights = SM(bt_weight, AR_BTCOEX_BT_WGHT) |
                                      SM(wlan_weight, AR_BTCOEX_WL_WGHT);
 }
@@ -219,9 +234,9 @@ void ath9k_hw_btcoex_enable(struct ath_hw *ah)
 {
         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 
-        switch (btcoex_hw->scheme) {
+        switch (ath9k_hw_get_btcoex_scheme(ah)) {
         case ATH_BTCOEX_CFG_NONE:
-                break;
+                return;
         case ATH_BTCOEX_CFG_2WIRE:
                 ath9k_hw_btcoex_enable_2wire(ah);
                 break;
@@ -246,6 +261,9 @@ void ath9k_hw_btcoex_disable(struct ath_hw *ah)
         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
         int i;
 
+        if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
+                return;
+
         btcoex_hw->enabled = false;
         if (btcoex_hw->scheme == ATH_BTCOEX_CFG_MCI) {
                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
@@ -294,6 +312,9 @@ static void ar9003_btcoex_bt_stomp(struct ath_hw *ah,
 void ath9k_hw_btcoex_bt_stomp(struct ath_hw *ah,
                               enum ath_stomp_type stomp_type)
 {
+        if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
+                return;
+
         if (AR_SREV_9300_20_OR_LATER(ah)) {
                 ar9003_btcoex_bt_stomp(ah, stomp_type);
                 return;