drivers/net/wireless/ath/ath9k/ar9003_mci.c

/*
 * Copyright (c) 2008-2011 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 <linux/export.h>
#include "hw.h"
#include "ar9003_phy.h"
#include "ar9003_mci.h"

static void ar9003_mci_reset_req_wakeup(struct ath_hw *ah)
{
	if (!AR_SREV_9462_20(ah))
		return;

	REG_RMW_FIELD(ah, AR_MCI_COMMAND2,
		      AR_MCI_COMMAND2_RESET_REQ_WAKEUP, 1);
	udelay(1);
	REG_RMW_FIELD(ah, AR_MCI_COMMAND2,
		      AR_MCI_COMMAND2_RESET_REQ_WAKEUP, 0);
}

static int ar9003_mci_wait_for_interrupt(struct ath_hw *ah, u32 address,
					u32 bit_position, int time_out)
{
	struct ath_common *common = ath9k_hw_common(ah);

	while (time_out) {

		if (REG_READ(ah, address) & bit_position) {

			REG_WRITE(ah, address, bit_position);

			if (address == AR_MCI_INTERRUPT_RX_MSG_RAW) {

				if (bit_position &
				    AR_MCI_INTERRUPT_RX_MSG_REQ_WAKE)
					ar9003_mci_reset_req_wakeup(ah);

				if (bit_position &
				    (AR_MCI_INTERRUPT_RX_MSG_SYS_SLEEPING |
				     AR_MCI_INTERRUPT_RX_MSG_SYS_WAKING))
					REG_WRITE(ah, AR_MCI_INTERRUPT_RAW,
					AR_MCI_INTERRUPT_REMOTE_SLEEP_UPDATE);

				REG_WRITE(ah, AR_MCI_INTERRUPT_RAW,
					  AR_MCI_INTERRUPT_RX_MSG);
			}
			break;
		}

		udelay(10);
		time_out -= 10;

		if (time_out < 0)
			break;
	}

	if (time_out <= 0) {
		ath_dbg(common, MCI,
			"MCI Wait for Reg 0x%08x = 0x%08x timeout\n",
			address, bit_position);
		ath_dbg(common, MCI,
			"MCI INT_RAW = 0x%08x, RX_MSG_RAW = 0x%08x\n",
			REG_READ(ah, AR_MCI_INTERRUPT_RAW),
			REG_READ(ah, AR_MCI_INTERRUPT_RX_MSG_RAW));
		time_out = 0;
	}

	return time_out;
}

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);
}

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);
}

static void ar9003_mci_send_req_wake(struct ath_hw *ah, bool wait_done)
{
	ar9003_mci_send_message(ah, MCI_REQ_WAKE, MCI_FLAG_DISABLE_TIMESTAMP,
				NULL, 0, wait_done, false);
	udelay(5);
}

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);
}

static void ar9003_mci_send_lna_take(struct ath_hw *ah, bool wait_done)
{
	u32 payload = 0x70000000;

	ar9003_mci_send_message(ah, MCI_LNA_TAKE, 0, &payload, 1,
				wait_done, false);
}

static void ar9003_mci_send_sys_sleeping(struct ath_hw *ah, bool wait_done)
{
	ar9003_mci_send_message(ah, MCI_SYS_SLEEPING,
				MCI_FLAG_DISABLE_TIMESTAMP,
				NULL, 0, wait_done, false);
}

static void ar9003_mci_send_coex_version_query(struct ath_hw *ah,
					       bool wait_done)
{
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	u32 payload[4] = {0, 0, 0, 0};

	if (!mci->bt_version_known &&
			(mci->bt_state != MCI_BT_SLEEP)) {
		ath_dbg(common, MCI, "MCI Send Coex version query\n");
		MCI_GPM_SET_TYPE_OPCODE(payload,
				MCI_GPM_COEX_AGENT, MCI_GPM_COEX_VERSION_QUERY);
		ar9003_mci_send_message(ah, MCI_GPM, 0, payload, 16,
				wait_done, true);
	}
}

static void ar9003_mci_send_coex_version_response(struct ath_hw *ah,
						     bool wait_done)
{
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	u32 payload[4] = {0, 0, 0, 0};

	ath_dbg(common, MCI, "MCI Send Coex version response\n");
	MCI_GPM_SET_TYPE_OPCODE(payload, MCI_GPM_COEX_AGENT,
			MCI_GPM_COEX_VERSION_RESPONSE);
	*(((u8 *)payload) + MCI_GPM_COEX_B_MAJOR_VERSION) =
		mci->wlan_ver_major;
	*(((u8 *)payload) + MCI_GPM_COEX_B_MINOR_VERSION) =
		mci->wlan_ver_minor;
	ar9003_mci_send_message(ah, MCI_GPM, 0, payload, 16, wait_done, true);
}

static void ar9003_mci_send_coex_wlan_channels(struct ath_hw *ah,
						  bool wait_done)
{
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	u32 *payload = &mci->wlan_channels[0];

	if ((mci->wlan_channels_update == true) &&
			(mci->bt_state != MCI_BT_SLEEP)) {
		MCI_GPM_SET_TYPE_OPCODE(payload,
		MCI_GPM_COEX_AGENT, MCI_GPM_COEX_WLAN_CHANNELS);
		ar9003_mci_send_message(ah, MCI_GPM, 0, payload, 16,
					wait_done, true);
		MCI_GPM_SET_TYPE_OPCODE(payload, 0xff, 0xff);
	}
}

static void ar9003_mci_send_coex_bt_status_query(struct ath_hw *ah,
						bool wait_done, u8 query_type)
{
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	u32 payload[4] = {0, 0, 0, 0};
	bool query_btinfo = !!(query_type & (MCI_GPM_COEX_QUERY_BT_ALL_INFO |
					     MCI_GPM_COEX_QUERY_BT_TOPOLOGY));

	if (mci->bt_state != MCI_BT_SLEEP) {

		ath_dbg(common, MCI, "MCI Send Coex BT Status Query 0x%02X\n",
			query_type);

		MCI_GPM_SET_TYPE_OPCODE(payload,
				MCI_GPM_COEX_AGENT, MCI_GPM_COEX_STATUS_QUERY);

		*(((u8 *)payload) + MCI_GPM_COEX_B_BT_BITMAP) = query_type;
		/*
		 * If bt_status_query message is  not sent successfully,
		 * then need_flush_btinfo should be set again.
		 */
		if (!ar9003_mci_send_message(ah, MCI_GPM, 0, payload, 16,
					     wait_done, true)) {
			if (query_btinfo) {
				mci->need_flush_btinfo = true;

				ath_dbg(common, MCI,
					"MCI send bt_status_query fail, set flush flag again\n");
			}
		}

		if (query_btinfo)
			mci->query_bt = false;
	}
}

void ar9003_mci_send_coex_halt_bt_gpm(struct ath_hw *ah, bool halt,
				      bool wait_done)
{
	struct ath_common *common = ath9k_hw_common(ah);
	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");

	MCI_GPM_SET_TYPE_OPCODE(payload,
				MCI_GPM_COEX_AGENT, MCI_GPM_COEX_HALT_BT_GPM);

	if (halt) {
		mci->query_bt = true;
		/* Send next unhalt no matter halt sent or not */
		mci->unhalt_bt_gpm = true;
		mci->need_flush_btinfo = true;
		*(((u8 *)payload) + MCI_GPM_COEX_B_HALT_STATE) =
			MCI_GPM_COEX_BT_GPM_HALT;
	} else
		*(((u8 *)payload) + MCI_GPM_COEX_B_HALT_STATE) =
			MCI_GPM_COEX_BT_GPM_UNHALT;

	ar9003_mci_send_message(ah, MCI_GPM, 0, payload, 16, wait_done, true);
}


static void ar9003_mci_prep_interface(struct ath_hw *ah)
{
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	u32 saved_mci_int_en;
	u32 mci_timeout = 150;

	mci->bt_state = MCI_BT_SLEEP;
	saved_mci_int_en = REG_READ(ah, AR_MCI_INTERRUPT_EN);

	REG_WRITE(ah, AR_MCI_INTERRUPT_EN, 0);
	REG_WRITE(ah, AR_MCI_INTERRUPT_RX_MSG_RAW,
		  REG_READ(ah, AR_MCI_INTERRUPT_RX_MSG_RAW));
	REG_WRITE(ah, AR_MCI_INTERRUPT_RAW,
		  REG_READ(ah, AR_MCI_INTERRUPT_RAW));

	/* Remote Reset */
	ath_dbg(common, MCI, "MCI Reset sequence start\n");
	ath_dbg(common, MCI, "MCI send REMOTE_RESET\n");
	ar9003_mci_remote_reset(ah, true);

	/*
	 * This delay is required for the reset delay worst case value 255 in
	 * MCI_COMMAND2 register
	 */

	if (AR_SREV_9462_10(ah))
		udelay(252);

	ath_dbg(common, MCI, "MCI Send REQ_WAKE to remoter(BT)\n");
	ar9003_mci_send_req_wake(ah, true);

	if (ar9003_mci_wait_for_interrupt(ah, AR_MCI_INTERRUPT_RX_MSG_RAW,
				AR_MCI_INTERRUPT_RX_MSG_SYS_WAKING, 500)) {

		ath_dbg(common, MCI, "MCI SYS_WAKING from remote(BT)\n");
		mci->bt_state = MCI_BT_AWAKE;

		if (AR_SREV_9462_10(ah))
			udelay(10);
		/*
		 * we don't need to send more remote_reset at this moment.
		 * If BT receive first remote_reset, then BT HW will
		 * be cleaned up and will be able to receive req_wake
		 * and BT HW will respond sys_waking.
		 * In this case, WLAN will receive BT's HW sys_waking.
		 * Otherwise, if BT SW missed initial remote_reset,
		 * that remote_reset will still clean up BT MCI RX,
		 * and the req_wake will wake BT up,
		 * and BT SW will respond this req_wake with a remote_reset and
		 * sys_waking. In this case, WLAN will receive BT's SW
		 * sys_waking. In either case, BT's RX is cleaned up. So we
		 * don't need to reply BT's remote_reset now, if any.
		 * Similarly, if in any case, WLAN can receive BT's sys_waking,
		 * that means WLAN's RX is also fine.
		 */

		/* Send SYS_WAKING to BT */

		ath_dbg(common, MCI, "MCI send SW SYS_WAKING to remote BT\n");

		ar9003_mci_send_sys_waking(ah, true);
		udelay(10);

		/*
		 * Set BT priority interrupt value to be 0xff to
		 * avoid having too many BT PRIORITY interrupts.
		 */

		REG_WRITE(ah, AR_MCI_BT_PRI0, 0xFFFFFFFF);
		REG_WRITE(ah, AR_MCI_BT_PRI1, 0xFFFFFFFF);
		REG_WRITE(ah, AR_MCI_BT_PRI2, 0xFFFFFFFF);
		REG_WRITE(ah, AR_MCI_BT_PRI3, 0xFFFFFFFF);
		REG_WRITE(ah, AR_MCI_BT_PRI, 0X000000FF);

		/*
		 * A contention reset will be received after send out
		 * sys_waking. Also BT priority interrupt bits will be set.
		 * Clear those bits before the next step.
		 */

		REG_WRITE(ah, AR_MCI_INTERRUPT_RX_MSG_RAW,
			  AR_MCI_INTERRUPT_RX_MSG_CONT_RST);
		REG_WRITE(ah, AR_MCI_INTERRUPT_RAW,
			  AR_MCI_INTERRUPT_BT_PRI);

		if (AR_SREV_9462_10(ah) || mci->is_2g) {
			/* Send LNA_TRANS */
			ath_dbg(common, MCI, "MCI send LNA_TRANS to BT\n");
			ar9003_mci_send_lna_transfer(ah, true);
			udelay(5);
		}

		if (AR_SREV_9462_10(ah) || (mci->is_2g &&
					    !mci->update_2g5g)) {
			if (ar9003_mci_wait_for_interrupt(ah,
				AR_MCI_INTERRUPT_RX_MSG_RAW,
				AR_MCI_INTERRUPT_RX_MSG_LNA_INFO,
				mci_timeout))
				ath_dbg(common, MCI,
					"MCI WLAN has control over the LNA & BT obeys it\n");
			else
				ath_dbg(common, MCI,
					"MCI BT didn't respond to LNA_TRANS\n");
		}

		if (AR_SREV_9462_10(ah)) {
			/* Send another remote_reset to deassert BT clk_req. */
			ath_dbg(common, MCI,
				"MCI another remote_reset to deassert clk_req\n");
			ar9003_mci_remote_reset(ah, true);
			udelay(252);
		}
	}

	/* Clear the extra redundant SYS_WAKING from BT */
	if ((mci->bt_state == MCI_BT_AWAKE) &&
		(REG_READ_FIELD(ah, AR_MCI_INTERRUPT_RX_MSG_RAW,
				AR_MCI_INTERRUPT_RX_MSG_SYS_WAKING)) &&
		(REG_READ_FIELD(ah, AR_MCI_INTERRUPT_RX_MSG_RAW,
				AR_MCI_INTERRUPT_RX_MSG_SYS_SLEEPING) == 0)) {

			REG_WRITE(ah, AR_MCI_INTERRUPT_RX_MSG_RAW,
				  AR_MCI_INTERRUPT_RX_MSG_SYS_WAKING);
			REG_WRITE(ah, AR_MCI_INTERRUPT_RAW,
				  AR_MCI_INTERRUPT_REMOTE_SLEEP_UPDATE);
	}

	REG_WRITE(ah, AR_MCI_INTERRUPT_EN, saved_mci_int_en);
}

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,
		  AR_MCI_INTERRUPT_RX_MSG_DEFAULT);
}

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);
}

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;

	/* Clean int bits after the values are read. */
	mci->raw_intr = 0;
	mci->rx_msg_intr = 0;
}
EXPORT_SYMBOL(ar9003_mci_get_interrupt);

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;

	mci->is_2g = is_2g;
}

static bool ar9003_mci_is_gpm_valid(struct ath_hw *ah, u32 msg_index)
{
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	u32 *payload;
	u32 recv_type, offset;

	if (msg_index == MCI_GPM_INVALID)
		return false;

	offset = msg_index << 4;

	payload = (u32 *)(mci->gpm_buf + offset);
	recv_type = MCI_GPM_TYPE(payload);

	if (recv_type == MCI_GPM_RSVD_PATTERN) {
		ath_dbg(common, MCI, "MCI Skip RSVD GPM\n");
		return false;
	}

	return true;
}

static void ar9003_mci_observation_set_up(struct ath_hw *ah)
{
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	if (mci->config & ATH_MCI_CONFIG_MCI_OBS_MCI) {

		ath9k_hw_cfg_output(ah, 3,
					AR_GPIO_OUTPUT_MUX_AS_MCI_WLAN_DATA);
		ath9k_hw_cfg_output(ah, 2, AR_GPIO_OUTPUT_MUX_AS_MCI_WLAN_CLK);
		ath9k_hw_cfg_output(ah, 1, AR_GPIO_OUTPUT_MUX_AS_MCI_BT_DATA);
		ath9k_hw_cfg_output(ah, 0, AR_GPIO_OUTPUT_MUX_AS_MCI_BT_CLK);

	} else if (mci->config & ATH_MCI_CONFIG_MCI_OBS_TXRX) {

		ath9k_hw_cfg_output(ah, 3, AR_GPIO_OUTPUT_MUX_AS_WL_IN_TX);
		ath9k_hw_cfg_output(ah, 2, AR_GPIO_OUTPUT_MUX_AS_WL_IN_RX);
		ath9k_hw_cfg_output(ah, 1, AR_GPIO_OUTPUT_MUX_AS_BT_IN_TX);
		ath9k_hw_cfg_output(ah, 0, AR_GPIO_OUTPUT_MUX_AS_BT_IN_RX);
		ath9k_hw_cfg_output(ah, 5, AR_GPIO_OUTPUT_MUX_AS_OUTPUT);

	} else if (mci->config & ATH_MCI_CONFIG_MCI_OBS_BT) {

		ath9k_hw_cfg_output(ah, 3, AR_GPIO_OUTPUT_MUX_AS_BT_IN_TX);
		ath9k_hw_cfg_output(ah, 2, AR_GPIO_OUTPUT_MUX_AS_BT_IN_RX);
		ath9k_hw_cfg_output(ah, 1, AR_GPIO_OUTPUT_MUX_AS_MCI_BT_DATA);
		ath9k_hw_cfg_output(ah, 0, AR_GPIO_OUTPUT_MUX_AS_MCI_BT_CLK);

	} else
		return;

	REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL, AR_GPIO_JTAG_DISABLE);

	if (AR_SREV_9462_20_OR_LATER(ah)) {
		REG_RMW_FIELD(ah, AR_PHY_GLB_CONTROL,
			      AR_GLB_DS_JTAG_DISABLE, 1);
		REG_RMW_FIELD(ah, AR_PHY_GLB_CONTROL,
			      AR_GLB_WLAN_UART_INTF_EN, 0);
		REG_SET_BIT(ah, AR_GLB_GPIO_CONTROL,
			    ATH_MCI_CONFIG_MCI_OBS_GPIO);
	}

	REG_RMW_FIELD(ah, AR_BTCOEX_CTRL2, AR_BTCOEX_CTRL2_GPIO_OBS_SEL, 0);
	REG_RMW_FIELD(ah, AR_BTCOEX_CTRL2, AR_BTCOEX_CTRL2_MAC_BB_OBS_SEL, 1);
	REG_WRITE(ah, AR_OBS, 0x4b);
	REG_RMW_FIELD(ah, AR_DIAG_SW, AR_DIAG_OBS_PT_SEL1, 0x03);
	REG_RMW_FIELD(ah, AR_DIAG_SW, AR_DIAG_OBS_PT_SEL2, 0x01);
	REG_RMW_FIELD(ah, AR_MACMISC, AR_MACMISC_MISC_OBS_BUS_LSB, 0x02);
	REG_RMW_FIELD(ah, AR_MACMISC, AR_MACMISC_MISC_OBS_BUS_MSB, 0x03);
	REG_RMW_FIELD(ah, AR_PHY_TEST_CTL_STATUS,
		      AR_PHY_TEST_CTL_DEBUGPORT_SEL, 0x07);
}

static bool ar9003_mci_send_coex_bt_flags(struct ath_hw *ah, bool wait_done,
						u8 opcode, u32 bt_flags)
{
	struct ath_common *common = ath9k_hw_common(ah);
	u32 pld[4] = {0, 0, 0, 0};

	MCI_GPM_SET_TYPE_OPCODE(pld,
			MCI_GPM_COEX_AGENT, MCI_GPM_COEX_BT_UPDATE_FLAGS);

	*(((u8 *)pld) + MCI_GPM_COEX_B_BT_FLAGS_OP)  = opcode;
	*(((u8 *)pld) + MCI_GPM_COEX_W_BT_FLAGS + 0) = bt_flags & 0xFF;
	*(((u8 *)pld) + MCI_GPM_COEX_W_BT_FLAGS + 1) = (bt_flags >> 8) & 0xFF;
	*(((u8 *)pld) + MCI_GPM_COEX_W_BT_FLAGS + 2) = (bt_flags >> 16) & 0xFF;
	*(((u8 *)pld) + MCI_GPM_COEX_W_BT_FLAGS + 3) = (bt_flags >> 24) & 0xFF;

	ath_dbg(common, MCI,
		"MCI BT_MCI_FLAGS: Send Coex BT Update Flags %s 0x%08x\n",
		opcode == MCI_GPM_COEX_BT_FLAGS_READ ? "READ" :
		opcode == MCI_GPM_COEX_BT_FLAGS_SET ? "SET" : "CLEAR",
		bt_flags);

	return ar9003_mci_send_message(ah, MCI_GPM, 0, pld, 16,
							wait_done, true);
}

void ar9003_mci_reset(struct ath_hw *ah, bool en_int, bool is_2g,
		      bool is_full_sleep)
{
	struct ath_common *common = ath9k_hw_common(ah);
	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);

	/*
	 * GPM buffer and scheduling message buffer are not allocated
	 */

	if (!mci->gpm_addr && !mci->sched_addr) {
		ath_dbg(common, MCI,
			"MCI GPM and schedule buffers are not allocated\n");
		return;
	}

	if (REG_READ(ah, AR_BTCOEX_CTRL) == 0xdeadbeef) {
		ath_dbg(common, MCI, "MCI it's deadbeef, quit mci_reset\n");
		return;
	}

	/* Program MCI DMA related registers */
	REG_WRITE(ah, AR_MCI_GPM_0, mci->gpm_addr);
	REG_WRITE(ah, AR_MCI_GPM_1, mci->gpm_len);
	REG_WRITE(ah, AR_MCI_SCHD_TABLE_0, mci->sched_addr);

	/*
	* To avoid MCI state machine be affected by incoming remote MCI msgs,
	* MCI mode will be enabled later, right before reset the MCI TX and RX.
	*/

	regval = SM(1, AR_BTCOEX_CTRL_AR9462_MODE) |
		 SM(1, AR_BTCOEX_CTRL_WBTIMER_EN) |
		 SM(1, AR_BTCOEX_CTRL_PA_SHARED) |
		 SM(1, AR_BTCOEX_CTRL_LNA_SHARED) |
		 SM(2, AR_BTCOEX_CTRL_NUM_ANTENNAS) |
		 SM(3, AR_BTCOEX_CTRL_RX_CHAIN_MASK) |
		 SM(0, AR_BTCOEX_CTRL_1_CHAIN_ACK) |
		 SM(0, AR_BTCOEX_CTRL_1_CHAIN_BCN) |
		 SM(0, AR_BTCOEX_CTRL_ONE_STEP_LOOK_AHEAD_EN);

	if (is_2g && (AR_SREV_9462_20(ah)) &&
		!(mci->config & ATH_MCI_CONFIG_DISABLE_OSLA)) {

		regval |= SM(1, AR_BTCOEX_CTRL_ONE_STEP_LOOK_AHEAD_EN);
		ath_dbg(common, MCI, "MCI sched one step look ahead\n");

		if (!(mci->config &
		      ATH_MCI_CONFIG_DISABLE_AGGR_THRESH)) {

			thresh = MS(mci->config,
				    ATH_MCI_CONFIG_AGGR_THRESH);
			thresh &= 7;
			regval |= SM(1,
				     AR_BTCOEX_CTRL_TIME_TO_NEXT_BT_THRESH_EN);
			regval |= SM(thresh, AR_BTCOEX_CTRL_AGGR_THRESH);

			REG_RMW_FIELD(ah, AR_MCI_SCHD_TABLE_2,
				      AR_MCI_SCHD_TABLE_2_HW_BASED, 1);
			REG_RMW_FIELD(ah, AR_MCI_SCHD_TABLE_2,
				      AR_MCI_SCHD_TABLE_2_MEM_BASED, 1);

		} else
			ath_dbg(common, MCI, "MCI sched aggr thresh: off\n");
	} else
		ath_dbg(common, MCI, "MCI SCHED one step look ahead off\n");

	if (AR_SREV_9462_10(ah))
		regval |= SM(1, AR_BTCOEX_CTRL_SPDT_ENABLE_10);

	REG_WRITE(ah, AR_BTCOEX_CTRL, regval);

	if (AR_SREV_9462_20(ah)) {
		REG_SET_BIT(ah, AR_PHY_GLB_CONTROL,
			    AR_BTCOEX_CTRL_SPDT_ENABLE);
		REG_RMW_FIELD(ah, AR_BTCOEX_CTRL3,
			      AR_BTCOEX_CTRL3_CONT_INFO_TIMEOUT, 20);
	}

	REG_RMW_FIELD(ah, AR_BTCOEX_CTRL2, AR_BTCOEX_CTRL2_RX_DEWEIGHT, 1);
	REG_RMW_FIELD(ah, AR_PCU_MISC, AR_PCU_BT_ANT_PREVENT_RX, 0);

	thresh = MS(mci->config, ATH_MCI_CONFIG_CLK_DIV);
	REG_RMW_FIELD(ah, AR_MCI_TX_CTRL, AR_MCI_TX_CTRL_CLK_DIV, thresh);
	REG_SET_BIT(ah, AR_BTCOEX_CTRL, AR_BTCOEX_CTRL_MCI_MODE_EN);

	/* Resetting the Rx and Tx paths of MCI */
	regval = REG_READ(ah, AR_MCI_COMMAND2);
	regval |= SM(1, AR_MCI_COMMAND2_RESET_TX);
	REG_WRITE(ah, AR_MCI_COMMAND2, regval);

	udelay(1);

	regval &= ~SM(1, AR_MCI_COMMAND2_RESET_TX);
	REG_WRITE(ah, AR_MCI_COMMAND2, regval);

	if (is_full_sleep) {
		ar9003_mci_mute_bt(ah);
		udelay(100);
	}

	regval |= SM(1, AR_MCI_COMMAND2_RESET_RX);
	REG_WRITE(ah, AR_MCI_COMMAND2, regval);
	udelay(1);
	regval &= ~SM(1, AR_MCI_COMMAND2_RESET_RX);
	REG_WRITE(ah, AR_MCI_COMMAND2, regval);

	ar9003_mci_state(ah, MCI_STATE_INIT_GPM_OFFSET, NULL);
	REG_WRITE(ah, AR_MCI_MSG_ATTRIBUTES_TABLE,
		  (SM(0xe801, AR_MCI_MSG_ATTRIBUTES_TABLE_INVALID_HDR) |
		   SM(0x0000, AR_MCI_MSG_ATTRIBUTES_TABLE_CHECKSUM)));

	REG_CLR_BIT(ah, AR_MCI_TX_CTRL,
			AR_MCI_TX_CTRL_DISABLE_LNA_UPDATE);

	if (AR_SREV_9462_20_OR_LATER(ah))
		ar9003_mci_observation_set_up(ah);

	mci->ready = true;
	ar9003_mci_prep_interface(ah);

	if (en_int)
		ar9003_mci_enable_interrupt(ah);
}

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);
	REG_WRITE(ah, AR_BTCOEX_WL_WEIGHTS1, 0xffffffff);
	REG_WRITE(ah, AR_BTCOEX_WL_WEIGHTS2, 0xffffffff);
	REG_WRITE(ah, AR_BTCOEX_WL_WEIGHTS3, 0xffffffff);
	REG_SET_BIT(ah, AR_MCI_TX_CTRL, AR_MCI_TX_CTRL_DISABLE_LNA_UPDATE);

	/* wait pending HW messages to flush out */
	udelay(10);

	/*
	 * Send LNA_TAKE and SYS_SLEEPING when
	 * 1. reset not after resuming from full sleep
	 * 2. before reset MCI RX, to quiet BT and avoid MCI RX misalignment
	 */

	ath_dbg(common, MCI, "MCI Send LNA take\n");
	ar9003_mci_send_lna_take(ah, true);

	udelay(5);

	ath_dbg(common, MCI, "MCI Send sys sleeping\n");
	ar9003_mci_send_sys_sleeping(ah, true);
}

void ar9003_mci_sync_bt_state(struct ath_hw *ah)
{
	struct ath_common *common = ath9k_hw_common(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) {
		ath_dbg(common, MCI,
			"MCI BT state mismatches. old: %d, new: %d\n",
			mci->bt_state, cur_bt_state);
		mci->bt_state = cur_bt_state;
	}

	if (mci->bt_state != MCI_BT_SLEEP) {

		ar9003_mci_send_coex_version_query(ah, true);
		ar9003_mci_send_coex_wlan_channels(ah, true);

		if (mci->unhalt_bt_gpm == true) {
			ath_dbg(common, MCI, "MCI unhalt BT GPM\n");
			ar9003_mci_send_coex_halt_bt_gpm(ah, false, true);
		}
	}
}

static void ar9003_mci_send_2g5g_status(struct ath_hw *ah, bool wait_done)
{
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	u32 new_flags, to_set, to_clear;

	if (AR_SREV_9462_20(ah) &&
	    mci->update_2g5g &&
	    (mci->bt_state != MCI_BT_SLEEP)) {

		if (mci->is_2g) {
			new_flags = MCI_2G_FLAGS;
			to_clear = MCI_2G_FLAGS_CLEAR_MASK;
			to_set = MCI_2G_FLAGS_SET_MASK;
		} else {
			new_flags = MCI_5G_FLAGS;
			to_clear = MCI_5G_FLAGS_CLEAR_MASK;
			to_set = MCI_5G_FLAGS_SET_MASK;
		}

		ath_dbg(common, MCI,
			"MCI BT_MCI_FLAGS: %s 0x%08x clr=0x%08x, set=0x%08x\n",
		mci->is_2g ? "2G" : "5G", new_flags, to_clear, to_set);

		if (to_clear)
			ar9003_mci_send_coex_bt_flags(ah, wait_done,
					MCI_GPM_COEX_BT_FLAGS_CLEAR, to_clear);

		if (to_set)
			ar9003_mci_send_coex_bt_flags(ah, wait_done,
					MCI_GPM_COEX_BT_FLAGS_SET, to_set);
	}

	if (AR_SREV_9462_10(ah) && (mci->bt_state != MCI_BT_SLEEP))
		mci->update_2g5g = false;
}

static void ar9003_mci_queue_unsent_gpm(struct ath_hw *ah, u8 header,
					u32 *payload, bool queue)
{
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	u8 type, opcode;

	if (queue) {

		if (payload)
			ath_dbg(common, MCI,
				"MCI ERROR: Send fail: %02x: %02x %02x %02x\n",
				header,
				*(((u8 *)payload) + 4),
				*(((u8 *)payload) + 5),
				*(((u8 *)payload) + 6));
		else
			ath_dbg(common, MCI, "MCI ERROR: Send fail: %02x\n",
				header);
	}

	/* check if the message is to be queued */
	if (header != MCI_GPM)
		return;

	type = MCI_GPM_TYPE(payload);
	opcode = MCI_GPM_OPCODE(payload);

	if (type != MCI_GPM_COEX_AGENT)
		return;

	switch (opcode) {
	case MCI_GPM_COEX_BT_UPDATE_FLAGS:

		if (AR_SREV_9462_10(ah))
			break;

		if (*(((u8 *)payload) + MCI_GPM_COEX_B_BT_FLAGS_OP) ==
				MCI_GPM_COEX_BT_FLAGS_READ)
			break;

		mci->update_2g5g = queue;

		if (queue)
			ath_dbg(common, MCI,
				"MCI BT_MCI_FLAGS: 2G5G status <queued> %s\n",
				mci->is_2g ? "2G" : "5G");
		else
			ath_dbg(common, MCI,
				"MCI BT_MCI_FLAGS: 2G5G status <sent> %s\n",
				mci->is_2g ? "2G" : "5G");

		break;

	case MCI_GPM_COEX_WLAN_CHANNELS:

		mci->wlan_channels_update = queue;
		if (queue)
			ath_dbg(common, MCI, "MCI WLAN channel map <queued>\n");
		else
			ath_dbg(common, MCI, "MCI WLAN channel map <sent>\n");
		break;

	case MCI_GPM_COEX_HALT_BT_GPM:

		if (*(((u8 *)payload) + MCI_GPM_COEX_B_HALT_STATE) ==
				MCI_GPM_COEX_BT_GPM_UNHALT) {

			mci->unhalt_bt_gpm = queue;

			if (queue)
				ath_dbg(common, MCI,
					"MCI UNHALT BT GPM <queued>\n");
			else {
				mci->halted_bt_gpm = false;
				ath_dbg(common, MCI,
					"MCI UNHALT BT GPM <sent>\n");
			}
		}

		if (*(((u8 *)payload) + MCI_GPM_COEX_B_HALT_STATE) ==
				MCI_GPM_COEX_BT_GPM_HALT) {

			mci->halted_bt_gpm = !queue;

			if (queue)
				ath_dbg(common, MCI,
					"MCI HALT BT GPM <not sent>\n");
			else
				ath_dbg(common, MCI,
					"MCI UNHALT BT GPM <sent>\n");
		}

		break;
	default:
		break;
	}
}

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) {

			ar9003_mci_send_2g5g_status(ah, true);
			ath_dbg(common, MCI, "MCI Send LNA trans\n");
			ar9003_mci_send_lna_transfer(ah, true);
			udelay(5);

			REG_CLR_BIT(ah, AR_MCI_TX_CTRL,
				    AR_MCI_TX_CTRL_DISABLE_LNA_UPDATE);

			if (AR_SREV_9462_20(ah)) {
				REG_CLR_BIT(ah, AR_PHY_GLB_CONTROL,
					    AR_BTCOEX_CTRL_BT_OWN_SPDT_CTRL);
				if (!(mci->config &
				      ATH_MCI_CONFIG_DISABLE_OSLA)) {
					REG_SET_BIT(ah, AR_BTCOEX_CTRL,
					AR_BTCOEX_CTRL_ONE_STEP_LOOK_AHEAD_EN);
				}
			}
		} else {
			ath_dbg(common, MCI, "MCI Send LNA take\n");
			ar9003_mci_send_lna_take(ah, true);
			udelay(5);

			REG_SET_BIT(ah, AR_MCI_TX_CTRL,
				    AR_MCI_TX_CTRL_DISABLE_LNA_UPDATE);

			if (AR_SREV_9462_20(ah)) {
				REG_SET_BIT(ah, AR_PHY_GLB_CONTROL,
					    AR_BTCOEX_CTRL_BT_OWN_SPDT_CTRL);
				REG_CLR_BIT(ah, AR_BTCOEX_CTRL,
					AR_BTCOEX_CTRL_ONE_STEP_LOOK_AHEAD_EN);
			}

			ar9003_mci_send_2g5g_status(ah, true);
		}
	}
}

bool ar9003_mci_send_message(struct ath_hw *ah, u8 header, u32 flag,
			     u32 *payload, u8 len, bool wait_done,
			     bool check_bt)
{
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	bool msg_sent = false;
	u32 regval;
	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);

	if ((regval == 0xdeadbeef) || !(regval & AR_BTCOEX_CTRL_MCI_MODE_EN)) {

		ath_dbg(common, MCI,
			"MCI Not sending 0x%x. MCI is not enabled. full_sleep = %d\n",
			header,
			(ah->power_mode == ATH9K_PM_FULL_SLEEP) ? 1 : 0);

		ar9003_mci_queue_unsent_gpm(ah, header, payload, true);
		return false;

	} else if (check_bt && (mci->bt_state == MCI_BT_SLEEP)) {

		ath_dbg(common, MCI,
			"MCI Don't send message 0x%x. BT is in sleep state\n",
			header);

		ar9003_mci_queue_unsent_gpm(ah, header, payload, true);
		return false;
	}

	if (wait_done)
		REG_WRITE(ah, AR_MCI_INTERRUPT_EN, 0);

	/* Need to clear SW_MSG_DONE raw bit before wait */

	REG_WRITE(ah, AR_MCI_INTERRUPT_RAW,
		  (AR_MCI_INTERRUPT_SW_MSG_DONE |
		   AR_MCI_INTERRUPT_MSG_FAIL_MASK));

	if (payload) {
		for (i = 0; (i * 4) < len; i++)
			REG_WRITE(ah, (AR_MCI_TX_PAYLOAD0 + i * 4),
				  *(payload + i));
	}

	REG_WRITE(ah, AR_MCI_COMMAND0,
		  (SM((flag & MCI_FLAG_DISABLE_TIMESTAMP),
		      AR_MCI_COMMAND0_DISABLE_TIMESTAMP) |
		   SM(len, AR_MCI_COMMAND0_LEN) |
		   SM(header, AR_MCI_COMMAND0_HEADER)));

	if (wait_done &&
	    !(ar9003_mci_wait_for_interrupt(ah, AR_MCI_INTERRUPT_RAW,
					AR_MCI_INTERRUPT_SW_MSG_DONE, 500)))
		ar9003_mci_queue_unsent_gpm(ah, header, payload, true);
	else {
		ar9003_mci_queue_unsent_gpm(ah, header, payload, false);
		msg_sent = true;
	}

	if (wait_done)
		REG_WRITE(ah, AR_MCI_INTERRUPT_EN, saved_mci_int_en);

	return msg_sent;
}
EXPORT_SYMBOL(ar9003_mci_send_message);

void ar9003_mci_setup(struct ath_hw *ah, u32 gpm_addr, void *gpm_buf,
		      u16 len, u32 sched_addr)
{
	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;
	mci->sched_addr = sched_addr;
	mci->sched_buf = sched_buf;

	ar9003_mci_reset(ah, true, true, true);
}
EXPORT_SYMBOL(ar9003_mci_setup);

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");
	ar9003_mci_disable_interrupt(ah);
}
EXPORT_SYMBOL(ar9003_mci_cleanup);

static void ar9003_mci_process_gpm_extra(struct ath_hw *ah, u8 gpm_type,
					 u8 gpm_opcode, u32 *p_gpm)
{
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	u8 *p_data = (u8 *) p_gpm;

	if (gpm_type != MCI_GPM_COEX_AGENT)
		return;

	switch (gpm_opcode) {
	case MCI_GPM_COEX_VERSION_QUERY:
		ath_dbg(common, MCI, "MCI Recv GPM COEX Version Query\n");
		ar9003_mci_send_coex_version_response(ah, true);
		break;
	case MCI_GPM_COEX_VERSION_RESPONSE:
		ath_dbg(common, MCI, "MCI Recv GPM COEX Version Response\n");
		mci->bt_ver_major =
			*(p_data + MCI_GPM_COEX_B_MAJOR_VERSION);
		mci->bt_ver_minor =
			*(p_data + MCI_GPM_COEX_B_MINOR_VERSION);
		mci->bt_version_known = true;
		ath_dbg(common, MCI, "MCI BT Coex version: %d.%d\n",
			mci->bt_ver_major, mci->bt_ver_minor);
		break;
	case MCI_GPM_COEX_STATUS_QUERY:
		ath_dbg(common, MCI,
			"MCI Recv GPM COEX Status Query = 0x%02X\n",
			*(p_data + MCI_GPM_COEX_B_WLAN_BITMAP));
		mci->wlan_channels_update = true;
		ar9003_mci_send_coex_wlan_channels(ah, true);
		break;
	case MCI_GPM_COEX_BT_PROFILE_INFO:
		mci->query_bt = true;
		ath_dbg(common, MCI, "MCI Recv GPM COEX BT_Profile_Info\n");
		break;
	case MCI_GPM_COEX_BT_STATUS_UPDATE:
		mci->query_bt = true;
		ath_dbg(common, MCI,
			"MCI Recv GPM COEX BT_Status_Update SEQ=%d (drop&query)\n",
			*(p_gpm + 3));
		break;
	default:
		break;
	}
}

u32 ar9003_mci_wait_for_gpm(struct ath_hw *ah, u8 gpm_type,
			    u8 gpm_opcode, int time_out)
{
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	u32 *p_gpm = NULL, mismatch = 0, more_data;
	u32 offset;
	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) {
		if (p_gpm) {
			MCI_GPM_RECYCLE(p_gpm);
			p_gpm = NULL;
		}

		if (more_data != MCI_GPM_MORE)
			time_out = ar9003_mci_wait_for_interrupt(ah,
					AR_MCI_INTERRUPT_RX_MSG_RAW,
					AR_MCI_INTERRUPT_RX_MSG_GPM,
					time_out);

		if (!time_out)
			break;

		offset = ar9003_mci_state(ah,
				MCI_STATE_NEXT_GPM_OFFSET, &more_data);

		if (offset == MCI_GPM_INVALID)
			continue;

		p_gpm = (u32 *) (mci->gpm_buf + offset);
		recv_type = MCI_GPM_TYPE(p_gpm);
		recv_opcode = MCI_GPM_OPCODE(p_gpm);

		if (MCI_GPM_IS_CAL_TYPE(recv_type)) {

			if (recv_type == gpm_type) {

				if ((gpm_type == MCI_GPM_BT_CAL_DONE) &&
				    !b_is_bt_cal_done) {
					gpm_type = MCI_GPM_BT_CAL_GRANT;
					ath_dbg(common, MCI,
						"MCI Recv BT_CAL_DONE wait BT_CAL_GRANT\n");
					continue;
				}

				break;
			}
		} else if ((recv_type == gpm_type) &&
			   (recv_opcode == gpm_opcode))
			break;

		/* not expected message */

		/*
		 * check if it's cal_grant
		 *
		 * When we're waiting for cal_grant in reset routine,
		 * it's possible that BT sends out cal_request at the
		 * same time. Since BT's calibration doesn't happen
		 * that often, we'll let BT completes calibration then
		 * we continue to wait for cal_grant from BT.
		 * Orginal: Wait BT_CAL_GRANT.
		 * New: Receive BT_CAL_REQ -> send WLAN_CAL_GRANT->wait
		 * BT_CAL_DONE -> Wait BT_CAL_GRANT.
		 */

		if ((gpm_type == MCI_GPM_BT_CAL_GRANT) &&
		    (recv_type == MCI_GPM_BT_CAL_REQ)) {

			u32 payload[4] = {0, 0, 0, 0};

			gpm_type = MCI_GPM_BT_CAL_DONE;
			ath_dbg(common, MCI,
				"MCI Rcv BT_CAL_REQ, send WLAN_CAL_GRANT\n");

			MCI_GPM_SET_CAL_TYPE(payload,
					MCI_GPM_WLAN_CAL_GRANT);

			ar9003_mci_send_message(ah, MCI_GPM, 0, payload, 16,
						false, false);

			ath_dbg(common, MCI, "MCI now wait for BT_CAL_DONE\n");

			continue;
		} else {
			ath_dbg(common, MCI, "MCI GPM subtype not match 0x%x\n",
				*(p_gpm + 1));
			mismatch++;
			ar9003_mci_process_gpm_extra(ah, recv_type,
					recv_opcode, p_gpm);
		}
	}
	if (p_gpm) {
		MCI_GPM_RECYCLE(p_gpm);
		p_gpm = NULL;
	}

	if (time_out <= 0) {
		time_out = 0;
		ath_dbg(common, MCI,
			"MCI GPM received timeout, mismatch = %d\n", mismatch);
	} else
		ath_dbg(common, MCI, "MCI Receive GPM type=0x%x, code=0x%x\n",
			gpm_type, gpm_opcode);

	while (more_data == MCI_GPM_MORE) {

		ath_dbg(common, MCI, "MCI discard remaining GPM\n");
		offset = ar9003_mci_state(ah, MCI_STATE_NEXT_GPM_OFFSET,
					  &more_data);

		if (offset == MCI_GPM_INVALID)
			break;

		p_gpm = (u32 *) (mci->gpm_buf + offset);
		recv_type = MCI_GPM_TYPE(p_gpm);
		recv_opcode = MCI_GPM_OPCODE(p_gpm);

		if (!MCI_GPM_IS_CAL_TYPE(recv_type))
			ar9003_mci_process_gpm_extra(ah, recv_type,
						     recv_opcode, p_gpm);

		MCI_GPM_RECYCLE(p_gpm);
	}

	return time_out;
}

u32 ar9003_mci_state(struct ath_hw *ah, u32 state_type, u32 *p_data)
{
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
	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) {

			value = REG_READ(ah, AR_BTCOEX_CTRL);

			if ((value == 0xdeadbeef) || (value == 0xffffffff))
				value = 0;
		}
		value &= AR_BTCOEX_CTRL_MCI_MODE_EN;
		break;
	case MCI_STATE_INIT_GPM_OFFSET:
		value = MS(REG_READ(ah, AR_MCI_GPM_1), AR_MCI_GPM_WRITE_PTR);
		ath_dbg(common, MCI, "MCI GPM initial WRITE_PTR=%d\n", value);
		mci->gpm_idx = value;
		break;
	case MCI_STATE_NEXT_GPM_OFFSET:
	case MCI_STATE_LAST_GPM_OFFSET:
		/*
		* This could be useful to avoid new GPM message interrupt which
		* may lead to spurious interrupt after power sleep, or multiple
		* entry of ath_mci_intr().
		* Adding empty GPM check by returning HAL_MCI_GPM_INVALID can
		* alleviate this effect, but clearing GPM RX interrupt bit is
		* safe, because whether this is called from hw or driver code
		* there must be an interrupt bit set/triggered initially
		*/
		REG_WRITE(ah, AR_MCI_INTERRUPT_RX_MSG_RAW,
			  AR_MCI_INTERRUPT_RX_MSG_GPM);

		gpm_ptr = MS(REG_READ(ah, AR_MCI_GPM_1), AR_MCI_GPM_WRITE_PTR);
		value = gpm_ptr;

		if (value == 0)
			value = mci->gpm_len - 1;
		else if (value >= mci->gpm_len) {
			if (value != 0xFFFF) {
				value = 0;
				ath_dbg(common, MCI,
					"MCI GPM offset out of range\n");
			}
		} else
			value--;

		if (value == 0xFFFF) {
			value = MCI_GPM_INVALID;
			more_gpm = MCI_GPM_NOMORE;
			ath_dbg(common, MCI,
				"MCI GPM ptr invalid @ptr=%d, offset=%d, more=GPM_NOMORE\n",
				gpm_ptr, value);
		} else if (state_type == MCI_STATE_NEXT_GPM_OFFSET) {

			if (gpm_ptr == mci->gpm_idx) {
				value = MCI_GPM_INVALID;
				more_gpm = MCI_GPM_NOMORE;

				ath_dbg(common, MCI,
					"MCI GPM message not available @ptr=%d, @offset=%d, more=GPM_NOMORE\n",
					gpm_ptr, value);
			} else {
				for (;;) {

					u32 temp_index;

					/* skip reserved GPM if any */

					if (value != mci->gpm_idx)
						more_gpm = MCI_GPM_MORE;
					else
						more_gpm = MCI_GPM_NOMORE;

					temp_index = mci->gpm_idx;
					mci->gpm_idx++;

					if (mci->gpm_idx >=
					    mci->gpm_len)
						mci->gpm_idx = 0;

					ath_dbg(common, MCI,
						"MCI GPM message got ptr=%d, @offset=%d, more=%d\n",
						gpm_ptr, temp_index,
						(more_gpm == MCI_GPM_MORE));

					if (ar9003_mci_is_gpm_valid(ah,
								temp_index)) {
						value = temp_index;
						break;
					}

					if (more_gpm == MCI_GPM_NOMORE) {
						value = MCI_GPM_INVALID;
						break;
					}
				}
			}
			if (p_data)
				*p_data = more_gpm;
			}

			if (value != MCI_GPM_INVALID)
				value <<= 4;

			break;
	case MCI_STATE_LAST_SCHD_MSG_OFFSET:
		value = MS(REG_READ(ah, AR_MCI_RX_STATUS),
				    AR_MCI_RX_LAST_SCHD_MSG_INDEX);
		/* Make it in bytes */
		value <<= 4;
		break;

	case MCI_STATE_REMOTE_SLEEP:
		value = MS(REG_READ(ah, AR_MCI_RX_STATUS),
			   AR_MCI_RX_REMOTE_SLEEP) ?
			MCI_BT_SLEEP : MCI_BT_AWAKE;
		break;

	case MCI_STATE_CONT_RSSI_POWER:
		value = MS(mci->cont_status, AR_MCI_CONT_RSSI_POWER);
			break;

	case MCI_STATE_CONT_PRIORITY:
		value = MS(mci->cont_status, AR_MCI_CONT_RRIORITY);
		break;

	case MCI_STATE_CONT_TXRX:
		value = MS(mci->cont_status, AR_MCI_CONT_TXRX);
		break;

	case MCI_STATE_BT:
		value = mci->bt_state;
		break;

	case MCI_STATE_SET_BT_SLEEP:
		mci->bt_state = MCI_BT_SLEEP;
		break;

	case MCI_STATE_SET_BT_AWAKE:
		mci->bt_state = MCI_BT_AWAKE;
		ar9003_mci_send_coex_version_query(ah, true);
		ar9003_mci_send_coex_wlan_channels(ah, true);

		if (mci->unhalt_bt_gpm) {

			ath_dbg(common, MCI, "MCI unhalt BT GPM\n");
			ar9003_mci_send_coex_halt_bt_gpm(ah, false, true);
		}

		ar9003_mci_2g5g_switch(ah, true);
		break;

	case MCI_STATE_SET_BT_CAL_START:
		mci->bt_state = MCI_BT_CAL_START;
		break;

	case MCI_STATE_SET_BT_CAL:
		mci->bt_state = MCI_BT_CAL;
		break;

	case MCI_STATE_RESET_REQ_WAKE:
		ar9003_mci_reset_req_wakeup(ah);
		mci->update_2g5g = true;

		if ((AR_SREV_9462_20_OR_LATER(ah)) &&
		    (mci->config & ATH_MCI_CONFIG_MCI_OBS_MASK)) {
			/* Check if we still have control of the GPIOs */
			if ((REG_READ(ah, AR_GLB_GPIO_CONTROL) &
				      ATH_MCI_CONFIG_MCI_OBS_GPIO) !=
					ATH_MCI_CONFIG_MCI_OBS_GPIO) {

				ath_dbg(common, MCI,
					"MCI reconfigure observation\n");
				ar9003_mci_observation_set_up(ah);
			}
		}
		break;

	case MCI_STATE_SEND_WLAN_COEX_VERSION:
		ar9003_mci_send_coex_version_response(ah, true);
		break;

	case MCI_STATE_SET_BT_COEX_VERSION:

		if (!p_data)
			ath_dbg(common, MCI,
				"MCI Set BT Coex version with NULL data!!\n");
		else {
			mci->bt_ver_major = (*p_data >> 8) & 0xff;
			mci->bt_ver_minor = (*p_data) & 0xff;
			mci->bt_version_known = true;
			ath_dbg(common, MCI, "MCI BT version set: %d.%d\n",
				mci->bt_ver_major, mci->bt_ver_minor);
		}
		break;

	case MCI_STATE_SEND_WLAN_CHANNELS:
		if (p_data) {
			if (((mci->wlan_channels[1] & 0xffff0000) ==
			     (*(p_data + 1) & 0xffff0000)) &&
			    (mci->wlan_channels[2] == *(p_data + 2)) &&
			    (mci->wlan_channels[3] == *(p_data + 3)))
				break;

			mci->wlan_channels[0] = *p_data++;
			mci->wlan_channels[1] = *p_data++;
			mci->wlan_channels[2] = *p_data++;
			mci->wlan_channels[3] = *p_data++;
		}
		mci->wlan_channels_update = true;
		ar9003_mci_send_coex_wlan_channels(ah, true);
		break;

	case MCI_STATE_SEND_VERSION_QUERY:
		ar9003_mci_send_coex_version_query(ah, true);
		break;

	case MCI_STATE_SEND_STATUS_QUERY:
		query_type = (AR_SREV_9462_10(ah)) ?
				MCI_GPM_COEX_QUERY_BT_ALL_INFO :
				MCI_GPM_COEX_QUERY_BT_TOPOLOGY;

		ar9003_mci_send_coex_bt_status_query(ah, true, query_type);
		break;

	case MCI_STATE_NEED_FLUSH_BT_INFO:
			/*
			 * btcoex_hw.mci.unhalt_bt_gpm means whether it's
			 * needed to send UNHALT message. It's set whenever
			 * there's a request to send HALT message.
			 * mci_halted_bt_gpm means whether HALT message is sent
			 * out successfully.
			 *
			 * Checking (mci_unhalt_bt_gpm == false) instead of
			 * checking (ah->mci_halted_bt_gpm == false) will make
			 * sure currently is in UNHALT-ed mode and BT can
			 * respond to status query.
			 */
			value = (!mci->unhalt_bt_gpm &&
				 mci->need_flush_btinfo) ? 1 : 0;
			if (p_data)
				mci->need_flush_btinfo =
					(*p_data != 0) ? true : false;
			break;

	case MCI_STATE_RECOVER_RX:

		ath_dbg(common, MCI, "MCI hw RECOVER_RX\n");
		ar9003_mci_prep_interface(ah);
		mci->query_bt = true;
		mci->need_flush_btinfo = true;
		ar9003_mci_send_coex_wlan_channels(ah, true);
		ar9003_mci_2g5g_switch(ah, true);
		break;

	case MCI_STATE_NEED_FTP_STOMP:
		value = !(mci->config & ATH_MCI_CONFIG_DISABLE_FTP_STOMP);
		break;

	case MCI_STATE_NEED_TUNING:
		value = !(mci->config & ATH_MCI_CONFIG_DISABLE_TUNING);
		break;

	default:
		break;

	}

	return value;
}
EXPORT_SYMBOL(ar9003_mci_state);