drivers/net/wireless/rsi/rsi_91x_sdio_ops.c - linux/torvalds/linux - Git at Google

 /**
  * Copyright (c) 2014 Redpine Signals 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/firmware.h>
 #include <net/rsi_91x.h>
 #include "rsi_sdio.h"
 #include "rsi_common.h"

 /**
  * rsi_sdio_master_access_msword() - This function sets the AHB master access
  *				     MS word in the SDIO slave registers.
  * @adapter: Pointer to the adapter structure.
  * @ms_word: ms word need to be initialized.
  *
  * Return: status: 0 on success, -1 on failure.
  */
 int rsi_sdio_master_access_msword(struct rsi_hw *adapter, u16 ms_word)
 {
 	u8 byte;
 	u8 function = 0;
 	int status = 0;

 	byte = (u8)(ms_word & 0x00FF);

 	rsi_dbg(INIT_ZONE,
 		"%s: MASTER_ACCESS_MSBYTE:0x%x\n", __func__, byte);

 	status = rsi_sdio_write_register(adapter,
 					 function,
 					 SDIO_MASTER_ACCESS_MSBYTE,
 					 &byte);
 	if (status) {
 		rsi_dbg(ERR_ZONE,
 			"%s: fail to access MASTER_ACCESS_MSBYTE\n",
 			__func__);
 		return -1;
 	}

 	byte = (u8)(ms_word >> 8);

 	rsi_dbg(INIT_ZONE, "%s:MASTER_ACCESS_LSBYTE:0x%x\n", __func__, byte);
 	status = rsi_sdio_write_register(adapter,
 					 function,
 					 SDIO_MASTER_ACCESS_LSBYTE,
 					 &byte);
 	return status;
 }

 void rsi_sdio_rx_thread(struct rsi_common *common)
 {
 	struct rsi_hw *adapter = common->priv;
 	struct rsi_91x_sdiodev *sdev = adapter->rsi_dev;
 	struct sk_buff *skb;
 	int status;

 	do {
 		rsi_wait_event(&sdev->rx_thread.event, EVENT_WAIT_FOREVER);
 		rsi_reset_event(&sdev->rx_thread.event);

 		while (true) {
 			if (atomic_read(&sdev->rx_thread.thread_done))
 				goto out;

 			skb = skb_dequeue(&sdev->rx_q.head);
 			if (!skb)
 				break;
 			if (sdev->rx_q.num_rx_pkts > 0)
 				sdev->rx_q.num_rx_pkts--;
 			status = rsi_read_pkt(common, skb->data, skb->len);
 			if (status) {
 				rsi_dbg(ERR_ZONE, "Failed to read the packet\n");
 				dev_kfree_skb(skb);
 				break;
 			}
 			dev_kfree_skb(skb);
 		}
 	} while (1);

 out:
 	rsi_dbg(INFO_ZONE, "%s: Terminated SDIO RX thread\n", __func__);
 	skb_queue_purge(&sdev->rx_q.head);
 	atomic_inc(&sdev->rx_thread.thread_done);
 	complete_and_exit(&sdev->rx_thread.completion, 0);
 }

 /**
  * rsi_process_pkt() - This Function reads rx_blocks register and figures out
  *		       the size of the rx pkt.
  * @common: Pointer to the driver private structure.
  *
  * Return: 0 on success, -1 on failure.
  */
 static int rsi_process_pkt(struct rsi_common *common)
 {
 	struct rsi_hw *adapter = common->priv;
 	struct rsi_91x_sdiodev *dev =
 		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
 	u8 num_blks = 0;
 	u32 rcv_pkt_len = 0;
 	int status = 0;
 	u8 value = 0;
 	struct sk_buff *skb;

 	if (dev->rx_q.num_rx_pkts >= RSI_MAX_RX_PKTS)
 		return 0;

 	num_blks = ((adapter->interrupt_status & 1) |
 			((adapter->interrupt_status >> RECV_NUM_BLOCKS) << 1));

 	if (!num_blks) {
 		status = rsi_sdio_read_register(adapter,
 						SDIO_RX_NUM_BLOCKS_REG,
 						&value);
 		if (status) {
 			rsi_dbg(ERR_ZONE,
 				"%s: Failed to read pkt length from the card:\n",
 				__func__);
 			return status;
 		}
 		num_blks = value & 0x1f;
 	}

 	if (dev->write_fail == 2)
 		rsi_sdio_ack_intr(common->priv, (1 << MSDU_PKT_PENDING));

 	if (unlikely(!num_blks)) {
 		dev->write_fail = 2;
 		return -1;
 	}

 	rcv_pkt_len = (num_blks * 256);

 	skb = dev_alloc_skb(rcv_pkt_len);
 	if (!skb)
 		return -ENOMEM;

 	status = rsi_sdio_host_intf_read_pkt(adapter, skb->data, rcv_pkt_len);
 	if (status) {
 		rsi_dbg(ERR_ZONE, "%s: Failed to read packet from card\n",
 			__func__);
 		dev_kfree_skb(skb);
 		return status;
 	}
 	skb_put(skb, rcv_pkt_len);
 	skb_queue_tail(&dev->rx_q.head, skb);
 	dev->rx_q.num_rx_pkts++;

 	rsi_set_event(&dev->rx_thread.event);

 	return 0;
 }

 /**
  * rsi_init_sdio_slave_regs() - This function does the actual initialization
  *				of SDBUS slave registers.
  * @adapter: Pointer to the adapter structure.
  *
  * Return: status: 0 on success, -1 on failure.
  */
 int rsi_init_sdio_slave_regs(struct rsi_hw *adapter)
 {
 	struct rsi_91x_sdiodev *dev =
 		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
 	u8 function = 0;
 	u8 byte;
 	int status = 0;

 	if (dev->next_read_delay) {
 		byte = dev->next_read_delay;
 		status = rsi_sdio_write_register(adapter,
 						 function,
 						 SDIO_NXT_RD_DELAY2,
 						 &byte);
 		if (status) {
 			rsi_dbg(ERR_ZONE,
 				"%s: Failed to write SDIO_NXT_RD_DELAY2\n",
 				__func__);
 			return -1;
 		}
 	}

 	if (dev->sdio_high_speed_enable) {
 		rsi_dbg(INIT_ZONE, "%s: Enabling SDIO High speed\n", __func__);
 		byte = 0x3;

 		status = rsi_sdio_write_register(adapter,
 						 function,
 						 SDIO_REG_HIGH_SPEED,
 						 &byte);
 		if (status) {
 			rsi_dbg(ERR_ZONE,
 				"%s: Failed to enable SDIO high speed\n",
 				__func__);
 			return -1;
 		}
 	}

 	/* This tells SDIO FIFO when to start read to host */
 	rsi_dbg(INIT_ZONE, "%s: Initializing SDIO read start level\n", __func__);
 	byte = 0x24;

 	status = rsi_sdio_write_register(adapter,
 					 function,
 					 SDIO_READ_START_LVL,
 					 &byte);
 	if (status) {
 		rsi_dbg(ERR_ZONE,
 			"%s: Failed to write SDIO_READ_START_LVL\n", __func__);
 		return -1;
 	}

 	rsi_dbg(INIT_ZONE, "%s: Initializing FIFO ctrl registers\n", __func__);
 	byte = (128 - 32);

 	status = rsi_sdio_write_register(adapter,
 					 function,
 					 SDIO_READ_FIFO_CTL,
 					 &byte);
 	if (status) {
 		rsi_dbg(ERR_ZONE,
 			"%s: Failed to write SDIO_READ_FIFO_CTL\n", __func__);
 		return -1;
 	}

 	byte = 32;
 	status = rsi_sdio_write_register(adapter,
 					 function,
 					 SDIO_WRITE_FIFO_CTL,
 					 &byte);
 	if (status) {
 		rsi_dbg(ERR_ZONE,
 			"%s: Failed to write SDIO_WRITE_FIFO_CTL\n", __func__);
 		return -1;
 	}

 	return 0;
 }

 /**
  * rsi_interrupt_handler() - This function read and process SDIO interrupts.
  * @adapter: Pointer to the adapter structure.
  *
  * Return: None.
  */
 void rsi_interrupt_handler(struct rsi_hw *adapter)
 {
 	struct rsi_common *common = adapter->priv;
 	struct rsi_91x_sdiodev *dev =
 		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
 	int status;
 	enum sdio_interrupt_type isr_type;
 	u8 isr_status = 0;
 	u8 fw_status = 0;

 	dev->rx_info.sdio_int_counter++;

 	do {
 		mutex_lock(&common->rx_lock);
 		status = rsi_sdio_read_register(common->priv,
 						RSI_FN1_INT_REGISTER,
 						&isr_status);
 		if (status) {
 			rsi_dbg(ERR_ZONE,
 				"%s: Failed to Read Intr Status Register\n",
 				__func__);
 			mutex_unlock(&common->rx_lock);
 			return;
 		}
 		adapter->interrupt_status = isr_status;

 		if (isr_status == 0) {
 			rsi_set_event(&common->tx_thread.event);
 			dev->rx_info.sdio_intr_status_zero++;
 			mutex_unlock(&common->rx_lock);
 			return;
 		}

 		rsi_dbg(ISR_ZONE, "%s: Intr_status = %x %d %d\n",
 			__func__, isr_status, (1 << MSDU_PKT_PENDING),
 			(1 << FW_ASSERT_IND));

 		do {
 			RSI_GET_SDIO_INTERRUPT_TYPE(isr_status, isr_type);

 			switch (isr_type) {
 			case BUFFER_AVAILABLE:
 				status = rsi_sdio_check_buffer_status(adapter,
 								      0);
 				if (status < 0)
 					rsi_dbg(ERR_ZONE,
 						"%s: Failed to check buffer status\n",
 						__func__);
 				rsi_sdio_ack_intr(common->priv,
 						  (1 << PKT_BUFF_AVAILABLE));
 				rsi_set_event(&common->tx_thread.event);

 				rsi_dbg(ISR_ZONE,
 					"%s: ==> BUFFER_AVAILABLE <==\n",
 					__func__);
 				dev->buff_status_updated = true;
 				break;

 			case FIRMWARE_ASSERT_IND:
 				rsi_dbg(ERR_ZONE,
 					"%s: ==> FIRMWARE Assert <==\n",
 					__func__);
 				status = rsi_sdio_read_register(common->priv,
 							SDIO_FW_STATUS_REG,
 							&fw_status);
 				if (status) {
 					rsi_dbg(ERR_ZONE,
 						"%s: Failed to read f/w reg\n",
 						__func__);
 				} else {
 					rsi_dbg(ERR_ZONE,
 						"%s: Firmware Status is 0x%x\n",
 						__func__ , fw_status);
 					rsi_sdio_ack_intr(common->priv,
 							  (1 << FW_ASSERT_IND));
 				}

 				common->fsm_state = FSM_CARD_NOT_READY;
 				break;

 			case MSDU_PACKET_PENDING:
 				rsi_dbg(ISR_ZONE, "Pkt pending interrupt\n");
 				dev->rx_info.total_sdio_msdu_pending_intr++;

 				status = rsi_process_pkt(common);
 				if (status) {
 					rsi_dbg(ERR_ZONE,
 						"%s: Failed to read pkt\n",
 						__func__);
 					mutex_unlock(&common->rx_lock);
 					return;
 				}
 				break;
 			default:
 				rsi_sdio_ack_intr(common->priv, isr_status);
 				dev->rx_info.total_sdio_unknown_intr++;
 				isr_status = 0;
 				rsi_dbg(ISR_ZONE,
 					"Unknown Interrupt %x\n",
 					isr_status);
 				break;
 			}
 			isr_status ^= BIT(isr_type - 1);
 		} while (isr_status);
 		mutex_unlock(&common->rx_lock);
 	} while (1);
 }

 /* This function is used to read buffer status register and
  * set relevant fields in rsi_91x_sdiodev struct.
  */
 int rsi_sdio_check_buffer_status(struct rsi_hw *adapter, u8 q_num)
 {
 	struct rsi_common *common = adapter->priv;
 	struct rsi_91x_sdiodev *dev =
 		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
 	u8 buf_status = 0;
 	int status = 0;
 	static int counter = 4;

 	if (!dev->buff_status_updated && counter) {
 		counter--;
 		goto out;
 	}

 	dev->buff_status_updated = false;
 	status = rsi_sdio_read_register(common->priv,
 					RSI_DEVICE_BUFFER_STATUS_REGISTER,
 					&buf_status);

 	if (status) {
 		rsi_dbg(ERR_ZONE,
 			"%s: Failed to read status register\n", __func__);
 		return -1;
 	}

 	if (buf_status & (BIT(PKT_MGMT_BUFF_FULL))) {
 		if (!dev->rx_info.mgmt_buffer_full)
 			dev->rx_info.mgmt_buf_full_counter++;
 		dev->rx_info.mgmt_buffer_full = true;
 	} else {
 		dev->rx_info.mgmt_buffer_full = false;
 	}

 	if (buf_status & (BIT(PKT_BUFF_FULL))) {
 		if (!dev->rx_info.buffer_full)
 			dev->rx_info.buf_full_counter++;
 		dev->rx_info.buffer_full = true;
 	} else {
 		dev->rx_info.buffer_full = false;
 	}

 	if (buf_status & (BIT(PKT_BUFF_SEMI_FULL))) {
 		if (!dev->rx_info.semi_buffer_full)
 			dev->rx_info.buf_semi_full_counter++;
 		dev->rx_info.semi_buffer_full = true;
 	} else {
 		dev->rx_info.semi_buffer_full = false;
 	}

 	if (dev->rx_info.mgmt_buffer_full || dev->rx_info.buf_full_counter)
 		counter = 1;
 	else
 		counter = 4;

 out:
 	if ((q_num == MGMT_SOFT_Q) && (dev->rx_info.mgmt_buffer_full))
 		return QUEUE_FULL;

 	if ((q_num < MGMT_SOFT_Q) && (dev->rx_info.buffer_full))
 		return QUEUE_FULL;

 	return QUEUE_NOT_FULL;
 }

 /**
  * rsi_sdio_determine_event_timeout() - This Function determines the event
  *					timeout duration.
  * @adapter: Pointer to the adapter structure.
  *
  * Return: timeout duration is returned.
  */
 int rsi_sdio_determine_event_timeout(struct rsi_hw *adapter)
 {
 	struct rsi_91x_sdiodev *dev =
 		(struct rsi_91x_sdiodev *)adapter->rsi_dev;

 	/* Once buffer full is seen, event timeout to occur every 2 msecs */
 	if (dev->rx_info.buffer_full)
 		return 2;

 	return EVENT_WAIT_FOREVER;
 }
	/**
	* Copyright (c) 2014 Redpine Signals 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/firmware.h>
	#include <net/rsi_91x.h>
	#include "rsi_sdio.h"
	#include "rsi_common.h"

	/**
	* rsi_sdio_master_access_msword() - This function sets the AHB master access
	* MS word in the SDIO slave registers.
	* @adapter: Pointer to the adapter structure.
	* @ms_word: ms word need to be initialized.
	*
	* Return: status: 0 on success, -1 on failure.
	*/
	int rsi_sdio_master_access_msword(struct rsi_hw *adapter, u16 ms_word)
	{
	u8 byte;
	u8 function = 0;
	int status = 0;

	byte = (u8)(ms_word & 0x00FF);

	rsi_dbg(INIT_ZONE,
	"%s: MASTER_ACCESS_MSBYTE:0x%x\n", __func__, byte);

	status = rsi_sdio_write_register(adapter,
	function,
	SDIO_MASTER_ACCESS_MSBYTE,
	&byte);
	if (status) {
	rsi_dbg(ERR_ZONE,
	"%s: fail to access MASTER_ACCESS_MSBYTE\n",
	__func__);
	return -1;
	}

	byte = (u8)(ms_word >> 8);

	rsi_dbg(INIT_ZONE, "%s:MASTER_ACCESS_LSBYTE:0x%x\n", __func__, byte);
	status = rsi_sdio_write_register(adapter,
	function,
	SDIO_MASTER_ACCESS_LSBYTE,
	&byte);
	return status;
	}

	void rsi_sdio_rx_thread(struct rsi_common *common)
	{
	struct rsi_hw *adapter = common->priv;
	struct rsi_91x_sdiodev *sdev = adapter->rsi_dev;
	struct sk_buff *skb;
	int status;

	do {
	rsi_wait_event(&sdev->rx_thread.event, EVENT_WAIT_FOREVER);
	rsi_reset_event(&sdev->rx_thread.event);

	while (true) {
	if (atomic_read(&sdev->rx_thread.thread_done))
	goto out;

	skb = skb_dequeue(&sdev->rx_q.head);
	if (!skb)
	break;
	if (sdev->rx_q.num_rx_pkts > 0)
	sdev->rx_q.num_rx_pkts--;
	status = rsi_read_pkt(common, skb->data, skb->len);
	if (status) {
	rsi_dbg(ERR_ZONE, "Failed to read the packet\n");
	dev_kfree_skb(skb);
	break;
	}
	dev_kfree_skb(skb);
	}
	} while (1);

	out:
	rsi_dbg(INFO_ZONE, "%s: Terminated SDIO RX thread\n", __func__);
	skb_queue_purge(&sdev->rx_q.head);
	atomic_inc(&sdev->rx_thread.thread_done);
	complete_and_exit(&sdev->rx_thread.completion, 0);
	}

	/**
	* rsi_process_pkt() - This Function reads rx_blocks register and figures out
	* the size of the rx pkt.
	* @common: Pointer to the driver private structure.
	*
	* Return: 0 on success, -1 on failure.
	*/
	static int rsi_process_pkt(struct rsi_common *common)
	{
	struct rsi_hw *adapter = common->priv;
	struct rsi_91x_sdiodev *dev =
	(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	u8 num_blks = 0;
	u32 rcv_pkt_len = 0;
	int status = 0;
	u8 value = 0;
	struct sk_buff *skb;

	if (dev->rx_q.num_rx_pkts >= RSI_MAX_RX_PKTS)
	return 0;

	num_blks = ((adapter->interrupt_status & 1) \|
	((adapter->interrupt_status >> RECV_NUM_BLOCKS) << 1));

	if (!num_blks) {
	status = rsi_sdio_read_register(adapter,
	SDIO_RX_NUM_BLOCKS_REG,
	&value);
	if (status) {
	rsi_dbg(ERR_ZONE,
	"%s: Failed to read pkt length from the card:\n",
	__func__);
	return status;
	}
	num_blks = value & 0x1f;
	}

	if (dev->write_fail == 2)
	rsi_sdio_ack_intr(common->priv, (1 << MSDU_PKT_PENDING));

	if (unlikely(!num_blks)) {
	dev->write_fail = 2;
	return -1;
	}

	rcv_pkt_len = (num_blks * 256);

	skb = dev_alloc_skb(rcv_pkt_len);
	if (!skb)
	return -ENOMEM;

	status = rsi_sdio_host_intf_read_pkt(adapter, skb->data, rcv_pkt_len);
	if (status) {
	rsi_dbg(ERR_ZONE, "%s: Failed to read packet from card\n",
	__func__);
	dev_kfree_skb(skb);
	return status;
	}
	skb_put(skb, rcv_pkt_len);
	skb_queue_tail(&dev->rx_q.head, skb);
	dev->rx_q.num_rx_pkts++;

	rsi_set_event(&dev->rx_thread.event);

	return 0;
	}

	/**
	* rsi_init_sdio_slave_regs() - This function does the actual initialization
	* of SDBUS slave registers.
	* @adapter: Pointer to the adapter structure.
	*
	* Return: status: 0 on success, -1 on failure.
	*/
	int rsi_init_sdio_slave_regs(struct rsi_hw *adapter)
	{
	struct rsi_91x_sdiodev *dev =
	(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	u8 function = 0;
	u8 byte;
	int status = 0;

	if (dev->next_read_delay) {
	byte = dev->next_read_delay;
	status = rsi_sdio_write_register(adapter,
	function,
	SDIO_NXT_RD_DELAY2,
	&byte);
	if (status) {
	rsi_dbg(ERR_ZONE,
	"%s: Failed to write SDIO_NXT_RD_DELAY2\n",
	__func__);
	return -1;
	}
	}

	if (dev->sdio_high_speed_enable) {
	rsi_dbg(INIT_ZONE, "%s: Enabling SDIO High speed\n", __func__);
	byte = 0x3;

	status = rsi_sdio_write_register(adapter,
	function,
	SDIO_REG_HIGH_SPEED,
	&byte);
	if (status) {
	rsi_dbg(ERR_ZONE,
	"%s: Failed to enable SDIO high speed\n",
	__func__);
	return -1;
	}
	}

	/* This tells SDIO FIFO when to start read to host */
	rsi_dbg(INIT_ZONE, "%s: Initializing SDIO read start level\n", __func__);
	byte = 0x24;

	status = rsi_sdio_write_register(adapter,
	function,
	SDIO_READ_START_LVL,
	&byte);
	if (status) {
	rsi_dbg(ERR_ZONE,
	"%s: Failed to write SDIO_READ_START_LVL\n", __func__);
	return -1;
	}

	rsi_dbg(INIT_ZONE, "%s: Initializing FIFO ctrl registers\n", __func__);
	byte = (128 - 32);

	status = rsi_sdio_write_register(adapter,
	function,
	SDIO_READ_FIFO_CTL,
	&byte);
	if (status) {
	rsi_dbg(ERR_ZONE,
	"%s: Failed to write SDIO_READ_FIFO_CTL\n", __func__);
	return -1;
	}

	byte = 32;
	status = rsi_sdio_write_register(adapter,
	function,
	SDIO_WRITE_FIFO_CTL,
	&byte);
	if (status) {
	rsi_dbg(ERR_ZONE,
	"%s: Failed to write SDIO_WRITE_FIFO_CTL\n", __func__);
	return -1;
	}

	return 0;
	}

	/**
	* rsi_interrupt_handler() - This function read and process SDIO interrupts.
	* @adapter: Pointer to the adapter structure.
	*
	* Return: None.
	*/
	void rsi_interrupt_handler(struct rsi_hw *adapter)
	{
	struct rsi_common *common = adapter->priv;
	struct rsi_91x_sdiodev *dev =
	(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	int status;
	enum sdio_interrupt_type isr_type;
	u8 isr_status = 0;
	u8 fw_status = 0;

	dev->rx_info.sdio_int_counter++;

	do {
	mutex_lock(&common->rx_lock);
	status = rsi_sdio_read_register(common->priv,
	RSI_FN1_INT_REGISTER,
	&isr_status);
	if (status) {
	rsi_dbg(ERR_ZONE,
	"%s: Failed to Read Intr Status Register\n",
	__func__);
	mutex_unlock(&common->rx_lock);
	return;
	}
	adapter->interrupt_status = isr_status;

	if (isr_status == 0) {
	rsi_set_event(&common->tx_thread.event);
	dev->rx_info.sdio_intr_status_zero++;
	mutex_unlock(&common->rx_lock);
	return;
	}

	rsi_dbg(ISR_ZONE, "%s: Intr_status = %x %d %d\n",
	__func__, isr_status, (1 << MSDU_PKT_PENDING),
	(1 << FW_ASSERT_IND));

	do {
	RSI_GET_SDIO_INTERRUPT_TYPE(isr_status, isr_type);

	switch (isr_type) {
	case BUFFER_AVAILABLE:
	status = rsi_sdio_check_buffer_status(adapter,
	0);
	if (status < 0)
	rsi_dbg(ERR_ZONE,
	"%s: Failed to check buffer status\n",
	__func__);
	rsi_sdio_ack_intr(common->priv,
	(1 << PKT_BUFF_AVAILABLE));
	rsi_set_event(&common->tx_thread.event);

	rsi_dbg(ISR_ZONE,
	"%s: ==> BUFFER_AVAILABLE <==\n",
	__func__);
	dev->buff_status_updated = true;
	break;

	case FIRMWARE_ASSERT_IND:
	rsi_dbg(ERR_ZONE,
	"%s: ==> FIRMWARE Assert <==\n",
	__func__);
	status = rsi_sdio_read_register(common->priv,
	SDIO_FW_STATUS_REG,
	&fw_status);
	if (status) {
	rsi_dbg(ERR_ZONE,
	"%s: Failed to read f/w reg\n",
	__func__);
	} else {
	rsi_dbg(ERR_ZONE,
	"%s: Firmware Status is 0x%x\n",
	__func__ , fw_status);
	rsi_sdio_ack_intr(common->priv,
	(1 << FW_ASSERT_IND));
	}

	common->fsm_state = FSM_CARD_NOT_READY;
	break;

	case MSDU_PACKET_PENDING:
	rsi_dbg(ISR_ZONE, "Pkt pending interrupt\n");
	dev->rx_info.total_sdio_msdu_pending_intr++;

	status = rsi_process_pkt(common);
	if (status) {
	rsi_dbg(ERR_ZONE,
	"%s: Failed to read pkt\n",
	__func__);
	mutex_unlock(&common->rx_lock);
	return;
	}
	break;
	default:
	rsi_sdio_ack_intr(common->priv, isr_status);
	dev->rx_info.total_sdio_unknown_intr++;
	isr_status = 0;
	rsi_dbg(ISR_ZONE,
	"Unknown Interrupt %x\n",
	isr_status);
	break;
	}
	isr_status ^= BIT(isr_type - 1);
	} while (isr_status);
	mutex_unlock(&common->rx_lock);
	} while (1);
	}

	/* This function is used to read buffer status register and
	* set relevant fields in rsi_91x_sdiodev struct.
	*/
	int rsi_sdio_check_buffer_status(struct rsi_hw *adapter, u8 q_num)
	{
	struct rsi_common *common = adapter->priv;
	struct rsi_91x_sdiodev *dev =
	(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	u8 buf_status = 0;
	int status = 0;
	static int counter = 4;

	if (!dev->buff_status_updated && counter) {
	counter--;
	goto out;
	}

	dev->buff_status_updated = false;
	status = rsi_sdio_read_register(common->priv,
	RSI_DEVICE_BUFFER_STATUS_REGISTER,
	&buf_status);

	if (status) {
	rsi_dbg(ERR_ZONE,
	"%s: Failed to read status register\n", __func__);
	return -1;
	}

	if (buf_status & (BIT(PKT_MGMT_BUFF_FULL))) {
	if (!dev->rx_info.mgmt_buffer_full)
	dev->rx_info.mgmt_buf_full_counter++;
	dev->rx_info.mgmt_buffer_full = true;
	} else {
	dev->rx_info.mgmt_buffer_full = false;
	}

	if (buf_status & (BIT(PKT_BUFF_FULL))) {
	if (!dev->rx_info.buffer_full)
	dev->rx_info.buf_full_counter++;
	dev->rx_info.buffer_full = true;
	} else {
	dev->rx_info.buffer_full = false;
	}

	if (buf_status & (BIT(PKT_BUFF_SEMI_FULL))) {
	if (!dev->rx_info.semi_buffer_full)
	dev->rx_info.buf_semi_full_counter++;
	dev->rx_info.semi_buffer_full = true;
	} else {
	dev->rx_info.semi_buffer_full = false;
	}

	if (dev->rx_info.mgmt_buffer_full \|\| dev->rx_info.buf_full_counter)
	counter = 1;
	else
	counter = 4;

	out:
	if ((q_num == MGMT_SOFT_Q) && (dev->rx_info.mgmt_buffer_full))
	return QUEUE_FULL;

	if ((q_num < MGMT_SOFT_Q) && (dev->rx_info.buffer_full))
	return QUEUE_FULL;

	return QUEUE_NOT_FULL;
	}

	/**
	* rsi_sdio_determine_event_timeout() - This Function determines the event
	* timeout duration.
	* @adapter: Pointer to the adapter structure.
	*
	* Return: timeout duration is returned.
	*/
	int rsi_sdio_determine_event_timeout(struct rsi_hw *adapter)
	{
	struct rsi_91x_sdiodev *dev =
	(struct rsi_91x_sdiodev *)adapter->rsi_dev;

	/* Once buffer full is seen, event timeout to occur every 2 msecs */
	if (dev->rx_info.buffer_full)
	return 2;

	return EVENT_WAIT_FOREVER;
	}