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, 54 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_mci.c b/drivers/net/wireless/ath/ath9k/ar9003_mci.c
index fdd0f815cf83..709520c6835b 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_mci.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_mci.c
@@ -85,6 +85,9 @@ void ar9003_mci_remote_reset(struct ath_hw *ah, bool wait_done)
 {
 	u32 payload[4] = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffff00};
 
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	ar9003_mci_send_message(ah, MCI_REMOTE_RESET, 0, payload, 16,
 				wait_done, false);
 	udelay(5);
@@ -94,6 +97,9 @@ void ar9003_mci_send_lna_transfer(struct ath_hw *ah, bool wait_done)
 {
 	u32 payload = 0x00000000;
 
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	ar9003_mci_send_message(ah, MCI_LNA_TRANS, 0, &payload, 1,
 				wait_done, false);
 }
@@ -107,6 +113,9 @@ static void ar9003_mci_send_req_wake(struct ath_hw *ah, bool wait_done)
 
 void ar9003_mci_send_sys_waking(struct ath_hw *ah, bool wait_done)
 {
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	ar9003_mci_send_message(ah, MCI_SYS_WAKING, MCI_FLAG_DISABLE_TIMESTAMP,
 				NULL, 0, wait_done, false);
 }
@@ -220,6 +229,9 @@ void ar9003_mci_send_coex_halt_bt_gpm(struct ath_hw *ah, bool halt,
 	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
 	u32 payload[4] = {0, 0, 0, 0};
 
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	ath_dbg(common, MCI, "MCI Send Coex %s BT GPM\n",
 		(halt) ? "halt" : "unhalt");
 
@@ -374,12 +386,17 @@ static void ar9003_mci_prep_interface(struct ath_hw *ah)
 
 void ar9003_mci_disable_interrupt(struct ath_hw *ah)
 {
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	REG_WRITE(ah, AR_MCI_INTERRUPT_EN, 0);
 	REG_WRITE(ah, AR_MCI_INTERRUPT_RX_MSG_EN, 0);
 }
 
 void ar9003_mci_enable_interrupt(struct ath_hw *ah)
 {
+	if (!ATH9K_HW_CAP_MCI)
+		return;
 
 	REG_WRITE(ah, AR_MCI_INTERRUPT_EN, AR_MCI_INTERRUPT_DEFAULT);
 	REG_WRITE(ah, AR_MCI_INTERRUPT_RX_MSG_EN,
@@ -390,6 +407,9 @@ bool ar9003_mci_check_int(struct ath_hw *ah, u32 ints)
 {
 	u32 intr;
 
+	if (!ATH9K_HW_CAP_MCI)
+		return false;
+
 	intr = REG_READ(ah, AR_MCI_INTERRUPT_RX_MSG_RAW);
 	return ((intr & ints) == ints);
 }
@@ -398,6 +418,10 @@ void ar9003_mci_get_interrupt(struct ath_hw *ah, u32 *raw_intr,
 			      u32 *rx_msg_intr)
 {
 	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
+
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	*raw_intr = mci->raw_intr;
 	*rx_msg_intr = mci->rx_msg_intr;
 
@@ -411,6 +435,9 @@ void ar9003_mci_2g5g_changed(struct ath_hw *ah, bool is_2g)
 {
 	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
 
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	if (!mci->update_2g5g &&
 	    (mci->is_2g != is_2g))
 		mci->update_2g5g = true;
@@ -524,6 +551,9 @@ void ar9003_mci_reset(struct ath_hw *ah, bool en_int, bool is_2g,
 	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
 	u32 regval, thresh;
 
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	ath_dbg(common, MCI, "MCI full_sleep = %d, is_2g = %d\n",
 		is_full_sleep, is_2g);
 
@@ -650,6 +680,9 @@ void ar9003_mci_mute_bt(struct ath_hw *ah)
 {
 	struct ath_common *common = ath9k_hw_common(ah);
 
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	/* disable all MCI messages */
 	REG_WRITE(ah, AR_MCI_MSG_ATTRIBUTES_TABLE, 0xffff0000);
 	REG_WRITE(ah, AR_BTCOEX_WL_WEIGHTS0, 0xffffffff);
@@ -682,6 +715,9 @@ void ar9003_mci_sync_bt_state(struct ath_hw *ah)
 	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
 	u32 cur_bt_state;
 
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	cur_bt_state = ar9003_mci_state(ah, MCI_STATE_REMOTE_SLEEP, NULL);
 
 	if (mci->bt_state != cur_bt_state) {
@@ -844,6 +880,9 @@ void ar9003_mci_2g5g_switch(struct ath_hw *ah, bool wait_done)
 	struct ath_common *common = ath9k_hw_common(ah);
 	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
 
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	if (mci->update_2g5g) {
 		if (mci->is_2g) {
 
@@ -895,6 +934,9 @@ bool ar9003_mci_send_message(struct ath_hw *ah, u8 header, u32 flag,
 	u32 saved_mci_int_en;
 	int i;
 
+	if (!ATH9K_HW_CAP_MCI)
+		return false;
+
 	saved_mci_int_en = REG_READ(ah, AR_MCI_INTERRUPT_EN);
 	regval = REG_READ(ah, AR_BTCOEX_CTRL);
 
@@ -961,6 +1003,9 @@ void ar9003_mci_setup(struct ath_hw *ah, u32 gpm_addr, void *gpm_buf,
 	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
 	void *sched_buf = (void *)((char *) gpm_buf + (sched_addr - gpm_addr));
 
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	mci->gpm_addr = gpm_addr;
 	mci->gpm_buf = gpm_buf;
 	mci->gpm_len = len;
@@ -975,6 +1020,9 @@ void ar9003_mci_cleanup(struct ath_hw *ah)
 {
 	struct ath_common *common = ath9k_hw_common(ah);
 
+	if (!ATH9K_HW_CAP_MCI)
+		return;
+
 	/* Turn off MCI and Jupiter mode. */
 	REG_WRITE(ah, AR_BTCOEX_CTRL, 0x00);
 	ath_dbg(common, MCI, "MCI ar9003_mci_cleanup\n");
@@ -1039,6 +1087,9 @@ u32 ar9003_mci_wait_for_gpm(struct ath_hw *ah, u8 gpm_type,
 	u8 recv_type = 0, recv_opcode = 0;
 	bool b_is_bt_cal_done = (gpm_type == MCI_GPM_BT_CAL_DONE);
 
+	if (!ATH9K_HW_CAP_MCI)
+		return 0;
+
 	more_data = time_out ? MCI_GPM_NOMORE : MCI_GPM_MORE;
 
 	while (time_out > 0) {
@@ -1168,6 +1219,9 @@ u32 ar9003_mci_state(struct ath_hw *ah, u32 state_type, u32 *p_data)
 	u32 value = 0, more_gpm = 0, gpm_ptr;
 	u8 query_type;
 
+	if (!ATH9K_HW_CAP_MCI)
+		return 0;
+
 	switch (state_type) {
 	case MCI_STATE_ENABLE:
 		if (mci->ready) {