wireless: mwifiex: initial commit for Marvell mwifiex driver

This driver adds WiFi support for Marvell 802.11n based chipsets
with SDIO interface. Currently only SD8787 is supported. More
chipsets will be supported later.

drivers/net/wireless/mwifiex/

Signed-off-by: Nishant Sarmukadam <nishants@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kiran Divekar <dkiran@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: Marc Yang <yangyang@marvell.com>
Signed-off-by: Ramesh Radhakrishnan <rramesh@marvell.com>
Signed-off-by: Frank Huang <frankh@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 1770 insertions, 0 deletions

diff --git a/drivers/net/wireless/mwifiex/sdio.c b/drivers/net/wireless/mwifiex/sdio.c
new file mode 100644
index 000000000000..f21e5cd19839
--- /dev/null
+++ b/drivers/net/wireless/mwifiex/sdio.c
@@ -0,0 +1,1770 @@
+/*
+ * Marvell Wireless LAN device driver: SDIO specific handling
+ *
+ * Copyright (C) 2011, Marvell International Ltd.
+ *
+ * This software file (the "File") is distributed by Marvell International
+ * Ltd. under the terms of the GNU General Public License Version 2, June 1991
+ * (the "License").  You may use, redistribute and/or modify this File in
+ * accordance with the terms and conditions of the License, a copy of which
+ * is available by writing to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
+ * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
+ *
+ * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
+ * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
+ * this warranty disclaimer.
+ */
+
+#include <linux/firmware.h>
+
+#include "decl.h"
+#include "ioctl.h"
+#include "util.h"
+#include "fw.h"
+#include "main.h"
+#include "wmm.h"
+#include "11n.h"
+#include "sdio.h"
+
+
+#define SDIO_VERSION	"1.0"
+
+static struct mwifiex_if_ops sdio_ops;
+
+static struct semaphore add_remove_card_sem;
+
+/*
+ * SDIO probe.
+ *
+ * This function probes an mwifiex device and registers it. It allocates
+ * the card structure, enables SDIO function number and initiates the
+ * device registration and initialization procedure by adding a logical
+ * interface.
+ */
+static int
+mwifiex_sdio_probe(struct sdio_func *func, const struct sdio_device_id *id)
+{
+	int ret = 0;
+	struct sdio_mmc_card *card = NULL;
+
+	pr_debug("info: vendor=0x%4.04X device=0x%4.04X class=%d function=%d\n",
+	       func->vendor, func->device, func->class, func->num);
+
+	card = kzalloc(sizeof(struct sdio_mmc_card), GFP_KERNEL);
+	if (!card) {
+		pr_err("%s: failed to alloc memory\n", __func__);
+		return -ENOMEM;
+	}
+
+	card->func = func;
+
+	func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;
+
+	sdio_claim_host(func);
+	ret = sdio_enable_func(func);
+	sdio_release_host(func);
+
+	if (ret) {
+		pr_err("%s: failed to enable function\n", __func__);
+		return -EIO;
+	}
+
+	if (mwifiex_add_card(card, &add_remove_card_sem, &sdio_ops)) {
+		pr_err("%s: add card failed\n", __func__);
+		kfree(card);
+		sdio_claim_host(func);
+		ret = sdio_disable_func(func);
+		sdio_release_host(func);
+		ret = -1;
+	}
+
+	return ret;
+}
+
+/*
+ * SDIO remove.
+ *
+ * This function removes the interface and frees up the card structure.
+ */
+static void
+mwifiex_sdio_remove(struct sdio_func *func)
+{
+	struct sdio_mmc_card *card;
+
+	pr_debug("info: SDIO func num=%d\n", func->num);
+
+	if (func) {
+		card = sdio_get_drvdata(func);
+		if (card) {
+			mwifiex_remove_card(card->adapter,
+					&add_remove_card_sem);
+			kfree(card);
+		}
+	}
+}
+
+/*
+ * SDIO suspend.
+ *
+ * Kernel needs to suspend all functions separately. Therefore all
+ * registered functions must have drivers with suspend and resume
+ * methods. Failing that the kernel simply removes the whole card.
+ *
+ * If already not suspended, this function allocates and sends a host
+ * sleep activate request to the firmware and turns off the traffic.
+ */
+static int mwifiex_sdio_suspend(struct device *dev)
+{
+	struct sdio_func *func = dev_to_sdio_func(dev);
+	struct sdio_mmc_card *card;
+	struct mwifiex_adapter *adapter = NULL;
+	mmc_pm_flag_t pm_flag = 0;
+	int hs_actived = 0;
+	int i;
+	int ret = 0;
+
+	if (func) {
+		pm_flag = sdio_get_host_pm_caps(func);
+		pr_debug("cmd: %s: suspend: PM flag = 0x%x\n",
+		       sdio_func_id(func), pm_flag);
+		if (!(pm_flag & MMC_PM_KEEP_POWER)) {
+			pr_err("%s: cannot remain alive while host is"
+				" suspended\n", sdio_func_id(func));
+			return -ENOSYS;
+		}
+
+		card = sdio_get_drvdata(func);
+		if (!card || !card->adapter) {
+			pr_err("suspend: invalid card or adapter\n");
+			return 0;
+		}
+	} else {
+		pr_err("suspend: sdio_func is not specified\n");
+		return 0;
+	}
+
+	adapter = card->adapter;
+
+	/* Enable the Host Sleep */
+	hs_actived = mwifiex_enable_hs(adapter);
+	if (hs_actived) {
+		pr_debug("cmd: suspend with MMC_PM_KEEP_POWER\n");
+		ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
+	}
+
+	/* Indicate device suspended */
+	adapter->is_suspended = true;
+
+	for (i = 0; i < adapter->priv_num; i++)
+		netif_carrier_off(adapter->priv[i]->netdev);
+
+	return ret;
+}
+
+/*
+ * SDIO resume.
+ *
+ * Kernel needs to suspend all functions separately. Therefore all
+ * registered functions must have drivers with suspend and resume
+ * methods. Failing that the kernel simply removes the whole card.
+ *
+ * If already not resumed, this function turns on the traffic and
+ * sends a host sleep cancel request to the firmware.
+ */
+static int mwifiex_sdio_resume(struct device *dev)
+{
+	struct sdio_func *func = dev_to_sdio_func(dev);
+	struct sdio_mmc_card *card;
+	struct mwifiex_adapter *adapter = NULL;
+	mmc_pm_flag_t pm_flag = 0;
+	int i;
+
+	if (func) {
+		pm_flag = sdio_get_host_pm_caps(func);
+		card = sdio_get_drvdata(func);
+		if (!card || !card->adapter) {
+			pr_err("resume: invalid card or adapter\n");
+			return 0;
+		}
+	} else {
+		pr_err("resume: sdio_func is not specified\n");
+		return 0;
+	}
+
+	adapter = card->adapter;
+
+	if (!adapter->is_suspended) {
+		dev_warn(adapter->dev, "device already resumed\n");
+		return 0;
+	}
+
+	adapter->is_suspended = false;
+
+	for (i = 0; i < adapter->priv_num; i++)
+		if (adapter->priv[i]->media_connected)
+			netif_carrier_on(adapter->priv[i]->netdev);
+
+	/* Disable Host Sleep */
+	mwifiex_cancel_hs(mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA),
+			      MWIFIEX_NO_WAIT);
+
+	return 0;
+}
+
+/* Device ID for SD8787 */
+#define SDIO_DEVICE_ID_MARVELL_8787   (0x9119)
+
+/* WLAN IDs */
+static const struct sdio_device_id mwifiex_ids[] = {
+	{SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8787)},
+	{},
+};
+
+MODULE_DEVICE_TABLE(sdio, mwifiex_ids);
+
+static const struct dev_pm_ops mwifiex_sdio_pm_ops = {
+	.suspend = mwifiex_sdio_suspend,
+	.resume = mwifiex_sdio_resume,
+};
+
+static struct sdio_driver mwifiex_sdio = {
+	.name = "mwifiex_sdio",
+	.id_table = mwifiex_ids,
+	.probe = mwifiex_sdio_probe,
+	.remove = mwifiex_sdio_remove,
+	.drv = {
+		.owner = THIS_MODULE,
+		.pm = &mwifiex_sdio_pm_ops,
+	}
+};
+
+/*
+ * This function writes data into SDIO card register.
+ */
+static int
+mwifiex_write_reg(struct mwifiex_adapter *adapter, u32 reg, u32 data)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	int ret = -1;
+
+	sdio_claim_host(card->func);
+	sdio_writeb(card->func, (u8) data, reg, &ret);
+	sdio_release_host(card->func);
+
+	return ret;
+}
+
+/*
+ * This function reads data from SDIO card register.
+ */
+static int
+mwifiex_read_reg(struct mwifiex_adapter *adapter, u32 reg, u32 *data)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	int ret = -1;
+	u8 val;
+
+	sdio_claim_host(card->func);
+	val = sdio_readb(card->func, reg, &ret);
+	sdio_release_host(card->func);
+
+	*data = val;
+
+	return ret;
+}
+
+/*
+ * This function writes multiple data into SDIO card memory.
+ *
+ * This does not work in suspended mode.
+ */
+static int
+mwifiex_write_data_sync(struct mwifiex_adapter *adapter,
+			u8 *buffer, u32 pkt_len, u32 port, u32 timeout)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	int ret = -1;
+	u8 blk_mode =
+		(port & MWIFIEX_SDIO_BYTE_MODE_MASK) ? BYTE_MODE : BLOCK_MODE;
+	u32 blk_size = (blk_mode == BLOCK_MODE) ? MWIFIEX_SDIO_BLOCK_SIZE : 1;
+	u32 blk_cnt =
+		(blk_mode ==
+		 BLOCK_MODE) ? (pkt_len /
+				MWIFIEX_SDIO_BLOCK_SIZE) : pkt_len;
+	u32 ioport = (port & MWIFIEX_SDIO_IO_PORT_MASK);
+
+	if (adapter->is_suspended) {
+		dev_err(adapter->dev,
+			"%s: not allowed while suspended\n", __func__);
+		return -1;
+	}
+
+	sdio_claim_host(card->func);
+
+	if (!sdio_writesb(card->func, ioport, buffer, blk_cnt * blk_size))
+		ret = 0;
+
+	sdio_release_host(card->func);
+
+	return ret;
+}
+
+/*
+ * This function reads multiple data from SDIO card memory.
+ */
+static int mwifiex_read_data_sync(struct mwifiex_adapter *adapter,
+				  u8 *buffer, u32 len,
+		       u32 port, u32 timeout, u8 claim)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	int ret = -1;
+	u8 blk_mode =
+		(port & MWIFIEX_SDIO_BYTE_MODE_MASK) ? BYTE_MODE : BLOCK_MODE;
+	u32 blk_size = (blk_mode == BLOCK_MODE) ? MWIFIEX_SDIO_BLOCK_SIZE : 1;
+	u32 blk_cnt =
+		(blk_mode ==
+		 BLOCK_MODE) ? (len / MWIFIEX_SDIO_BLOCK_SIZE) : len;
+	u32 ioport = (port & MWIFIEX_SDIO_IO_PORT_MASK);
+
+	if (claim)
+		sdio_claim_host(card->func);
+
+	if (!sdio_readsb(card->func, buffer, ioport, blk_cnt * blk_size))
+		ret = 0;
+
+	if (claim)
+		sdio_release_host(card->func);
+
+	return ret;
+}
+
+/*
+ * This function wakes up the card.
+ *
+ * A host power up command is written to the card configuration
+ * register to wake up the card.
+ */
+static int mwifiex_pm_wakeup_card(struct mwifiex_adapter *adapter)
+{
+	int ret;
+
+	dev_dbg(adapter->dev, "event: wakeup device...\n");
+	ret = mwifiex_write_reg(adapter, CONFIGURATION_REG, HOST_POWER_UP);
+
+	return ret;
+}
+
+/*
+ * This function is called after the card has woken up.
+ *
+ * The card configuration register is reset.
+ */
+static int mwifiex_pm_wakeup_card_complete(struct mwifiex_adapter *adapter)
+{
+	int ret;
+
+	dev_dbg(adapter->dev, "cmd: wakeup device completed\n");
+	ret = mwifiex_write_reg(adapter, CONFIGURATION_REG, 0);
+
+	return ret;
+}
+
+/*
+ * This function initializes the IO ports.
+ *
+ * The following operations are performed -
+ *      - Read the IO ports (0, 1 and 2)
+ *      - Set host interrupt Reset-To-Read to clear
+ *      - Set auto re-enable interrupt
+ */
+static int mwifiex_init_sdio_ioport(struct mwifiex_adapter *adapter)
+{
+	u32 reg;
+
+	adapter->ioport = 0;
+
+	/* Read the IO port */
+	if (!mwifiex_read_reg(adapter, IO_PORT_0_REG, &reg))
+		adapter->ioport |= (reg & 0xff);
+	else
+		return -1;
+
+	if (!mwifiex_read_reg(adapter, IO_PORT_1_REG, &reg))
+		adapter->ioport |= ((reg & 0xff) << 8);
+	else
+		return -1;
+
+	if (!mwifiex_read_reg(adapter, IO_PORT_2_REG, &reg))
+		adapter->ioport |= ((reg & 0xff) << 16);
+	else
+		return -1;
+
+	pr_debug("info: SDIO FUNC1 IO port: %#x\n", adapter->ioport);
+
+	/* Set Host interrupt reset to read to clear */
+	if (!mwifiex_read_reg(adapter, HOST_INT_RSR_REG, &reg))
+		mwifiex_write_reg(adapter, HOST_INT_RSR_REG,
+				  reg | SDIO_INT_MASK);
+	else
+		return -1;
+
+	/* Dnld/Upld ready set to auto reset */
+	if (!mwifiex_read_reg(adapter, CARD_MISC_CFG_REG, &reg))
+		mwifiex_write_reg(adapter, CARD_MISC_CFG_REG,
+				  reg | AUTO_RE_ENABLE_INT);
+	else
+		return -1;
+
+	return 0;
+}
+
+/*
+ * This function sends data to the card.
+ */
+static int mwifiex_write_data_to_card(struct mwifiex_adapter *adapter,
+				      u8 *payload, u32 pkt_len, u32 port)
+{
+	u32 i = 0;
+	int ret = 0;
+
+	do {
+		ret = mwifiex_write_data_sync(adapter, payload, pkt_len,
+								port, 0);
+		if (ret) {
+			i++;
+			dev_err(adapter->dev, "host_to_card, write iomem"
+					" (%d) failed: %d\n", i, ret);
+			if (mwifiex_write_reg(adapter,
+					CONFIGURATION_REG, 0x04))
+				dev_err(adapter->dev, "write CFG reg failed\n");
+
+			ret = -1;
+			if (i > MAX_WRITE_IOMEM_RETRY)
+				return ret;
+		}
+	} while (ret == -1);
+
+	return ret;
+}
+
+/*
+ * This function gets the read port.
+ *
+ * If control port bit is set in MP read bitmap, the control port
+ * is returned, otherwise the current read port is returned and
+ * the value is increased (provided it does not reach the maximum
+ * limit, in which case it is reset to 1)
+ */
+static int mwifiex_get_rd_port(struct mwifiex_adapter *adapter, u8 *port)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	u16 rd_bitmap = card->mp_rd_bitmap;
+
+	dev_dbg(adapter->dev, "data: mp_rd_bitmap=0x%04x\n", rd_bitmap);
+
+	if (!(rd_bitmap & (CTRL_PORT_MASK | DATA_PORT_MASK)))
+		return -1;
+
+	if (card->mp_rd_bitmap & CTRL_PORT_MASK) {
+		card->mp_rd_bitmap &= (u16) (~CTRL_PORT_MASK);
+		*port = CTRL_PORT;
+		dev_dbg(adapter->dev, "data: port=%d mp_rd_bitmap=0x%04x\n",
+		       *port, card->mp_rd_bitmap);
+	} else {
+		if (card->mp_rd_bitmap & (1 << card->curr_rd_port)) {
+			card->mp_rd_bitmap &=
+				(u16) (~(1 << card->curr_rd_port));
+			*port = card->curr_rd_port;
+
+			if (++card->curr_rd_port == MAX_PORT)
+				card->curr_rd_port = 1;
+		} else {
+			return -1;
+		}
+
+		dev_dbg(adapter->dev,
+			"data: port=%d mp_rd_bitmap=0x%04x -> 0x%04x\n",
+		       *port, rd_bitmap, card->mp_rd_bitmap);
+	}
+	return 0;
+}
+
+/*
+ * This function gets the write port for data.
+ *
+ * The current write port is returned if available and the value is
+ * increased (provided it does not reach the maximum limit, in which
+ * case it is reset to 1)
+ */
+static int mwifiex_get_wr_port_data(struct mwifiex_adapter *adapter, u8 *port)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	u16 wr_bitmap = card->mp_wr_bitmap;
+
+	dev_dbg(adapter->dev, "data: mp_wr_bitmap=0x%04x\n", wr_bitmap);
+
+	if (!(wr_bitmap & card->mp_data_port_mask))
+		return -1;
+
+	if (card->mp_wr_bitmap & (1 << card->curr_wr_port)) {
+		card->mp_wr_bitmap &= (u16) (~(1 << card->curr_wr_port));
+		*port = card->curr_wr_port;
+		if (++card->curr_wr_port == card->mp_end_port)
+			card->curr_wr_port = 1;
+	} else {
+		adapter->data_sent = true;
+		return -EBUSY;
+	}
+
+	if (*port == CTRL_PORT) {
+		dev_err(adapter->dev, "invalid data port=%d cur port=%d"
+				" mp_wr_bitmap=0x%04x -> 0x%04x\n",
+				*port, card->curr_wr_port, wr_bitmap,
+				card->mp_wr_bitmap);
+		return -1;
+	}
+
+	dev_dbg(adapter->dev, "data: port=%d mp_wr_bitmap=0x%04x -> 0x%04x\n",
+	       *port, wr_bitmap, card->mp_wr_bitmap);
+
+	return 0;
+}
+
+/*
+ * This function polls the card status.
+ */
+static int
+mwifiex_sdio_poll_card_status(struct mwifiex_adapter *adapter, u8 bits)
+{
+	u32 tries;
+	u32 cs = 0;
+
+	for (tries = 0; tries < MAX_POLL_TRIES; tries++) {
+		if (mwifiex_read_reg(adapter, CARD_STATUS_REG, &cs))
+			break;
+		else if ((cs & bits) == bits)
+			return 0;
+
+		udelay(10);
+	}
+
+	dev_err(adapter->dev, "poll card status failed, tries = %d\n",
+	       tries);
+	return -1;
+}
+
+/*
+ * This function reads the firmware status.
+ */
+static int
+mwifiex_sdio_read_fw_status(struct mwifiex_adapter *adapter, u16 *dat)
+{
+	u32 fws0 = 0, fws1 = 0;
+
+	if (mwifiex_read_reg(adapter, CARD_FW_STATUS0_REG, &fws0))
+		return -1;
+
+	if (mwifiex_read_reg(adapter, CARD_FW_STATUS1_REG, &fws1))
+		return -1;
+
+	*dat = (u16) ((fws1 << 8) | fws0);
+
+	return 0;
+}
+
+/*
+ * This function disables the host interrupt.
+ *
+ * The host interrupt mask is read, the disable bit is reset and
+ * written back to the card host interrupt mask register.
+ */
+static int mwifiex_sdio_disable_host_int(struct mwifiex_adapter *adapter)
+{
+	u32 host_int_mask = 0;
+
+	/* Read back the host_int_mask register */
+	if (mwifiex_read_reg(adapter, HOST_INT_MASK_REG, &host_int_mask))
+		return -1;
+
+	/* Update with the mask and write back to the register */
+	host_int_mask &= ~HOST_INT_DISABLE;
+
+	if (mwifiex_write_reg(adapter, HOST_INT_MASK_REG, host_int_mask)) {
+		dev_err(adapter->dev, "disable host interrupt failed\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * This function enables the host interrupt.
+ *
+ * The host interrupt enable mask is written to the card
+ * host interrupt mask register.
+ */
+static int mwifiex_sdio_enable_host_int(struct mwifiex_adapter *adapter)
+{
+	/* Simply write the mask to the register */
+	if (mwifiex_write_reg(adapter, HOST_INT_MASK_REG, HOST_INT_ENABLE)) {
+		dev_err(adapter->dev, "enable host interrupt failed\n");
+		return -1;
+	}
+	return 0;
+}
+
+/*
+ * This function sends a data buffer to the card.
+ */
+static int mwifiex_sdio_card_to_host(struct mwifiex_adapter *adapter,
+				     u32 *type, u8 *buffer,
+				     u32 npayload, u32 ioport)
+{
+	int ret = 0;
+	u32 nb;
+
+	if (!buffer) {
+		dev_err(adapter->dev, "%s: buffer is NULL\n", __func__);
+		return -1;
+	}
+
+	ret = mwifiex_read_data_sync(adapter, buffer, npayload, ioport, 0, 1);
+
+	if (ret) {
+		dev_err(adapter->dev, "%s: read iomem failed: %d\n", __func__,
+				ret);
+		return -1;
+	}
+
+	nb = le16_to_cpu(*(__le16 *) (buffer));
+	if (nb > npayload) {
+		dev_err(adapter->dev, "%s: invalid packet, nb=%d, npayload=%d\n",
+				__func__, nb, npayload);
+		return -1;
+	}
+
+	*type = le16_to_cpu(*(__le16 *) (buffer + 2));
+
+	return ret;
+}
+
+/*
+ * This function downloads the firmware to the card.
+ *
+ * Firmware is downloaded to the card in blocks. Every block download
+ * is tested for CRC errors, and retried a number of times before
+ * returning failure.
+ */
+static int mwifiex_prog_fw_w_helper(struct mwifiex_adapter *adapter,
+				    struct mwifiex_fw_image *fw)
+{
+	int ret = 0;
+	u8 *firmware = fw->fw_buf;
+	u32 firmware_len = fw->fw_len;
+	u32 offset = 0;
+	u32 base0, base1;
+	u8 *fwbuf;
+	u16 len = 0;
+	u32 txlen = 0, tx_blocks = 0, tries = 0;
+	u32 i = 0;
+
+	if (!firmware_len) {
+		dev_err(adapter->dev, "firmware image not found!"
+				" Terminating download\n");
+		return -1;
+	}
+
+	dev_dbg(adapter->dev, "info: downloading FW image (%d bytes)\n",
+			firmware_len);
+
+	/* Assume that the allocated buffer is 8-byte aligned */
+	fwbuf = kzalloc(MWIFIEX_UPLD_SIZE, GFP_KERNEL);
+	if (!fwbuf) {
+		dev_err(adapter->dev, "unable to alloc buffer for firmware."
+				" Terminating download\n");
+		return -1;
+	}
+
+	/* Perform firmware data transfer */
+	do {
+		/* The host polls for the DN_LD_CARD_RDY and CARD_IO_READY
+		   bits */
+		ret = mwifiex_sdio_poll_card_status(adapter, CARD_IO_READY |
+						    DN_LD_CARD_RDY);
+		if (ret) {
+			dev_err(adapter->dev, "FW download with helper:"
+					" poll status timeout @ %d\n", offset);
+			goto done;
+		}
+
+		/* More data? */
+		if (offset >= firmware_len)
+			break;
+
+		for (tries = 0; tries < MAX_POLL_TRIES; tries++) {
+			ret = mwifiex_read_reg(adapter, HOST_F1_RD_BASE_0,
+					       &base0);
+			if (ret) {
+				dev_err(adapter->dev, "dev BASE0 register read"
+					" failed: base0=0x%04X(%d). Terminating "
+				       "download\n", base0, base0);
+				goto done;
+			}
+			ret = mwifiex_read_reg(adapter, HOST_F1_RD_BASE_1,
+					       &base1);
+			if (ret) {
+				dev_err(adapter->dev, "dev BASE1 register read"
+					" failed: base1=0x%04X(%d). Terminating "
+				       "download\n", base1, base1);
+				goto done;
+			}
+			len = (u16) (((base1 & 0xff) << 8) | (base0 & 0xff));
+
+			if (len)
+				break;
+
+			udelay(10);
+		}
+
+		if (!len) {
+			break;
+		} else if (len > MWIFIEX_UPLD_SIZE) {
+			dev_err(adapter->dev, "FW download failed @ %d,"
+				" invalid length %d\n", offset, len);
+			ret = -1;
+			goto done;
+		}
+
+		txlen = len;
+
+		if (len & BIT(0)) {
+			i++;
+			if (i > MAX_WRITE_IOMEM_RETRY) {
+				dev_err(adapter->dev, "FW download failed @"
+					" %d, over max retry count\n", offset);
+				ret = -1;
+				goto done;
+			}
+			dev_err(adapter->dev, "CRC indicated by the helper:"
+			       " len = 0x%04X, txlen = %d\n", len, txlen);
+			len &= ~BIT(0);
+			/* Setting this to 0 to resend from same offset */
+			txlen = 0;
+		} else {
+			i = 0;
+
+			/* Set blocksize to transfer - checking for last
+			   block */
+			if (firmware_len - offset < txlen)
+				txlen = firmware_len - offset;
+
+			tx_blocks = (txlen + MWIFIEX_SDIO_BLOCK_SIZE -
+					1) / MWIFIEX_SDIO_BLOCK_SIZE;
+
+			/* Copy payload to buffer */
+			memmove(fwbuf, &firmware[offset], txlen);
+		}
+
+		ret = mwifiex_write_data_sync(adapter, fwbuf, tx_blocks *
+					      MWIFIEX_SDIO_BLOCK_SIZE,
+					      adapter->ioport, 0);
+		if (ret) {
+			dev_err(adapter->dev, "FW download, write iomem (%d)"
+					" failed @ %d\n", i, offset);
+			if (mwifiex_write_reg(adapter, CONFIGURATION_REG, 0x04))
+				dev_err(adapter->dev, "write CFG reg failed\n");
+
+			ret = -1;
+			goto done;
+		}
+
+		offset += txlen;
+	} while (true);
+
+	dev_dbg(adapter->dev, "info: FW download over, size %d bytes\n",
+						offset);
+
+	ret = 0;
+done:
+	kfree(fwbuf);
+	return ret;
+}
+
+/*
+ * This function checks the firmware status in card.
+ *
+ * The winner interface is also determined by this function.
+ */
+static int mwifiex_check_fw_status(struct mwifiex_adapter *adapter,
+				   u32 poll_num, int *winner)
+{
+	int ret = 0;
+	u16 firmware_stat;
+	u32 tries;
+	u32 winner_status;
+
+	/* Wait for firmware initialization event */
+	for (tries = 0; tries < poll_num; tries++) {
+		ret = mwifiex_sdio_read_fw_status(adapter, &firmware_stat);
+		if (ret)
+			continue;
+		if (firmware_stat == FIRMWARE_READY) {
+			ret = 0;
+			break;
+		} else {
+			mdelay(100);
+			ret = -1;
+		}
+	}
+
+	if (winner && ret) {
+		if (mwifiex_read_reg
+		    (adapter, CARD_FW_STATUS0_REG, &winner_status))
+			winner_status = 0;
+
+		if (winner_status)
+			*winner = 0;
+		else
+			*winner = 1;
+	}
+	return ret;
+}
+
+/*
+ * This function reads the interrupt status from card.
+ */
+static void mwifiex_interrupt_status(struct mwifiex_adapter *adapter)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	u32 sdio_ireg = 0;
+	unsigned long flags;
+
+	if (mwifiex_read_data_sync(adapter, card->mp_regs, MAX_MP_REGS,
+				   REG_PORT | MWIFIEX_SDIO_BYTE_MODE_MASK, 0,
+				   0)) {
+		dev_err(adapter->dev, "read mp_regs failed\n");
+		return;
+	}
+
+	sdio_ireg = card->mp_regs[HOST_INTSTATUS_REG];
+	if (sdio_ireg) {
+		/*
+		 * DN_LD_HOST_INT_STATUS and/or UP_LD_HOST_INT_STATUS
+		 * Clear the interrupt status register
+		 */
+		dev_dbg(adapter->dev, "int: sdio_ireg = %#x\n", sdio_ireg);
+		spin_lock_irqsave(&adapter->int_lock, flags);
+		adapter->int_status |= sdio_ireg;
+		spin_unlock_irqrestore(&adapter->int_lock, flags);
+	}
+
+	return;
+}
+
+/*
+ * SDIO interrupt handler.
+ *
+ * This function reads the interrupt status from firmware and assigns
+ * the main process in workqueue which will handle the interrupt.
+ */
+static void
+mwifiex_sdio_interrupt(struct sdio_func *func)
+{
+	struct mwifiex_adapter *adapter;
+	struct sdio_mmc_card *card;
+
+	card = sdio_get_drvdata(func);
+	if (!card || !card->adapter) {
+		pr_debug("int: func=%p card=%p adapter=%p\n",
+		       func, card, card ? card->adapter : NULL);
+		return;
+	}
+	adapter = card->adapter;
+
+	if (adapter->surprise_removed)
+		return;
+
+	if (!adapter->pps_uapsd_mode && adapter->ps_state == PS_STATE_SLEEP)
+		adapter->ps_state = PS_STATE_AWAKE;
+
+	mwifiex_interrupt_status(adapter);
+	queue_work(adapter->workqueue, &adapter->main_work);
+
+	return;
+}
+
+/*
+ * This function decodes a received packet.
+ *
+ * Based on the type, the packet is treated as either a data, or
+ * a command response, or an event, and the correct handler
+ * function is invoked.
+ */
+static int mwifiex_decode_rx_packet(struct mwifiex_adapter *adapter,
+				    struct sk_buff *skb, u32 upld_typ)
+{
+	u8 *cmd_buf;
+
+	skb_pull(skb, INTF_HEADER_LEN);
+
+	switch (upld_typ) {
+	case MWIFIEX_TYPE_DATA:
+		dev_dbg(adapter->dev, "info: --- Rx: Data packet ---\n");
+		mwifiex_handle_rx_packet(adapter, skb);
+		break;
+
+	case MWIFIEX_TYPE_CMD:
+		dev_dbg(adapter->dev, "info: --- Rx: Cmd Response ---\n");
+		/* take care of curr_cmd = NULL case */
+		if (!adapter->curr_cmd) {
+			cmd_buf = adapter->upld_buf;
+
+			if (adapter->ps_state == PS_STATE_SLEEP_CFM)
+				mwifiex_process_sleep_confirm_resp(adapter,
+							skb->data, skb->len);
+
+			memcpy(cmd_buf, skb->data, min_t(u32,
+				       MWIFIEX_SIZE_OF_CMD_BUFFER, skb->len));
+
+			dev_kfree_skb_any(skb);
+		} else {
+			adapter->cmd_resp_received = true;
+			adapter->curr_cmd->resp_skb = skb;
+		}
+		break;
+
+	case MWIFIEX_TYPE_EVENT:
+		dev_dbg(adapter->dev, "info: --- Rx: Event ---\n");
+		adapter->event_cause = *(u32 *) skb->data;
+
+		skb_pull(skb, MWIFIEX_EVENT_HEADER_LEN);
+
+		if ((skb->len > 0) && (skb->len  < MAX_EVENT_SIZE))
+			memcpy(adapter->event_body, skb->data, skb->len);
+
+		/* event cause has been saved to adapter->event_cause */
+		adapter->event_received = true;
+		adapter->event_skb = skb;
+
+		break;
+
+	default:
+		dev_err(adapter->dev, "unknown upload type %#x\n", upld_typ);
+		dev_kfree_skb_any(skb);
+		break;
+	}
+
+	return 0;
+}
+
+/*
+ * This function transfers received packets from card to driver, performing
+ * aggregation if required.
+ *
+ * For data received on control port, or if aggregation is disabled, the
+ * received buffers are uploaded as separate packets. However, if aggregation
+ * is enabled and required, the buffers are copied onto an aggregation buffer,
+ * provided there is space left, processed and finally uploaded.
+ */
+static int mwifiex_sdio_card_to_host_mp_aggr(struct mwifiex_adapter *adapter,
+					     struct sk_buff *skb, u8 port)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	s32 f_do_rx_aggr = 0;
+	s32 f_do_rx_cur = 0;
+	s32 f_aggr_cur = 0;
+	struct sk_buff *skb_deaggr;
+	u32 pind = 0;
+	u32 pkt_len, pkt_type = 0;
+	u8 *curr_ptr;
+	u32 rx_len = skb->len;
+
+	if (port == CTRL_PORT) {
+		/* Read the command Resp without aggr */
+		dev_dbg(adapter->dev, "info: %s: no aggregation for cmd "
+				"response\n", __func__);
+
+		f_do_rx_cur = 1;
+		goto rx_curr_single;
+	}
+
+	if (!card->mpa_rx.enabled) {
+		dev_dbg(adapter->dev, "info: %s: rx aggregation disabled\n",
+						__func__);
+
+		f_do_rx_cur = 1;
+		goto rx_curr_single;
+	}
+
+	if (card->mp_rd_bitmap & (~((u16) CTRL_PORT_MASK))) {
+		/* Some more data RX pending */
+		dev_dbg(adapter->dev, "info: %s: not last packet\n", __func__);
+
+		if (MP_RX_AGGR_IN_PROGRESS(card)) {
+			if (MP_RX_AGGR_BUF_HAS_ROOM(card, skb->len)) {
+				f_aggr_cur = 1;
+			} else {
+				/* No room in Aggr buf, do rx aggr now */
+				f_do_rx_aggr = 1;
+				f_do_rx_cur = 1;
+			}
+		} else {
+			/* Rx aggr not in progress */
+			f_aggr_cur = 1;
+		}
+
+	} else {
+		/* No more data RX pending */
+		dev_dbg(adapter->dev, "info: %s: last packet\n", __func__);
+
+		if (MP_RX_AGGR_IN_PROGRESS(card)) {
+			f_do_rx_aggr = 1;
+			if (MP_RX_AGGR_BUF_HAS_ROOM(card, skb->len))
+				f_aggr_cur = 1;
+			else
+				/* No room in Aggr buf, do rx aggr now */
+				f_do_rx_cur = 1;
+		} else {
+			f_do_rx_cur = 1;
+		}
+	}
+
+	if (f_aggr_cur) {
+		dev_dbg(adapter->dev, "info: current packet aggregation\n");
+		/* Curr pkt can be aggregated */
+		MP_RX_AGGR_SETUP(card, skb, port);
+
+		if (MP_RX_AGGR_PKT_LIMIT_REACHED(card) ||
+		    MP_RX_AGGR_PORT_LIMIT_REACHED(card)) {
+			dev_dbg(adapter->dev, "info: %s: aggregated packet "
+					"limit reached\n", __func__);
+			/* No more pkts allowed in Aggr buf, rx it */
+			f_do_rx_aggr = 1;
+		}
+	}
+
+	if (f_do_rx_aggr) {
+		/* do aggr RX now */
+		dev_dbg(adapter->dev, "info: do_rx_aggr: num of packets: %d\n",
+		       card->mpa_rx.pkt_cnt);
+
+		if (mwifiex_read_data_sync(adapter, card->mpa_rx.buf,
+					   card->mpa_rx.buf_len,
+					   (adapter->ioport | 0x1000 |
+					    (card->mpa_rx.ports << 4)) +
+					   card->mpa_rx.start_port, 0, 1))
+			return -1;
+
+		curr_ptr = card->mpa_rx.buf;
+
+		for (pind = 0; pind < card->mpa_rx.pkt_cnt; pind++) {
+
+			/* get curr PKT len & type */
+			pkt_len = *(u16 *) &curr_ptr[0];
+			pkt_type = *(u16 *) &curr_ptr[2];
+
+			/* copy pkt to deaggr buf */
+			skb_deaggr = card->mpa_rx.skb_arr[pind];
+
+			if ((pkt_type == MWIFIEX_TYPE_DATA) && (pkt_len <=
+					 card->mpa_rx.len_arr[pind])) {
+
+				memcpy(skb_deaggr->data, curr_ptr, pkt_len);
+
+				skb_trim(skb_deaggr, pkt_len);
+
+				/* Process de-aggr packet */
+				mwifiex_decode_rx_packet(adapter, skb_deaggr,
+							 pkt_type);
+			} else {
+				dev_err(adapter->dev, "wrong aggr pkt:"
+					" type=%d len=%d max_len=%d\n",
+					pkt_type, pkt_len,
+					card->mpa_rx.len_arr[pind]);
+				dev_kfree_skb_any(skb_deaggr);
+			}
+			curr_ptr += card->mpa_rx.len_arr[pind];
+		}
+		MP_RX_AGGR_BUF_RESET(card);
+	}
+
+rx_curr_single:
+	if (f_do_rx_cur) {
+		dev_dbg(adapter->dev, "info: RX: port: %d, rx_len: %d\n",
+			port, rx_len);
+
+		if (mwifiex_sdio_card_to_host(adapter, &pkt_type,
+					      skb->data, skb->len,
+					      adapter->ioport + port))
+			return -1;
+
+		mwifiex_decode_rx_packet(adapter, skb, pkt_type);
+	}
+
+	return 0;
+}
+
+/*
+ * This function checks the current interrupt status.
+ *
+ * The following interrupts are checked and handled by this function -
+ *      - Data sent
+ *      - Command sent
+ *      - Packets received
+ *
+ * Since the firmware does not generate download ready interrupt if the
+ * port updated is command port only, command sent interrupt checking
+ * should be done manually, and for every SDIO interrupt.
+ *
+ * In case of Rx packets received, the packets are uploaded from card to
+ * host and processed accordingly.
+ */
+static int mwifiex_process_int_status(struct mwifiex_adapter *adapter)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	int ret = 0;
+	u8 sdio_ireg;
+	struct sk_buff *skb = NULL;
+	u8 port = CTRL_PORT;
+	u32 len_reg_l, len_reg_u;
+	u32 rx_blocks;
+	u16 rx_len;
+	unsigned long flags;
+
+	spin_lock_irqsave(&adapter->int_lock, flags);
+	sdio_ireg = adapter->int_status;
+	adapter->int_status = 0;
+	spin_unlock_irqrestore(&adapter->int_lock, flags);
+
+	if (!sdio_ireg)
+		return ret;
+
+	if (sdio_ireg & DN_LD_HOST_INT_STATUS) {
+		card->mp_wr_bitmap = ((u16) card->mp_regs[WR_BITMAP_U]) << 8;
+		card->mp_wr_bitmap |= (u16) card->mp_regs[WR_BITMAP_L];
+		dev_dbg(adapter->dev, "int: DNLD: wr_bitmap=0x%04x\n",
+				card->mp_wr_bitmap);
+		if (adapter->data_sent &&
+		    (card->mp_wr_bitmap & card->mp_data_port_mask)) {
+			dev_dbg(adapter->dev,
+				"info:  <--- Tx DONE Interrupt --->\n");
+			adapter->data_sent = false;
+		}
+	}
+
+	/* As firmware will not generate download ready interrupt if the port
+	   updated is command port only, cmd_sent should be done for any SDIO
+	   interrupt. */
+	if (adapter->cmd_sent) {
+		/* Check if firmware has attach buffer at command port and
+		   update just that in wr_bit_map. */
+		card->mp_wr_bitmap |=
+			(u16) card->mp_regs[WR_BITMAP_L] & CTRL_PORT_MASK;
+		if (card->mp_wr_bitmap & CTRL_PORT_MASK)
+			adapter->cmd_sent = false;
+	}
+
+	dev_dbg(adapter->dev, "info: cmd_sent=%d data_sent=%d\n",
+	       adapter->cmd_sent, adapter->data_sent);
+	if (sdio_ireg & UP_LD_HOST_INT_STATUS) {
+		card->mp_rd_bitmap = ((u16) card->mp_regs[RD_BITMAP_U]) << 8;
+		card->mp_rd_bitmap |= (u16) card->mp_regs[RD_BITMAP_L];
+		dev_dbg(adapter->dev, "int: UPLD: rd_bitmap=0x%04x\n",
+				card->mp_rd_bitmap);
+
+		while (true) {
+			ret = mwifiex_get_rd_port(adapter, &port);
+			if (ret) {
+				dev_dbg(adapter->dev,
+					"info: no more rd_port available\n");
+				break;
+			}
+			len_reg_l = RD_LEN_P0_L + (port << 1);
+			len_reg_u = RD_LEN_P0_U + (port << 1);
+			rx_len = ((u16) card->mp_regs[len_reg_u]) << 8;
+			rx_len |= (u16) card->mp_regs[len_reg_l];
+			dev_dbg(adapter->dev, "info: RX: port=%d rx_len=%u\n",
+					port, rx_len);
+			rx_blocks =
+				(rx_len + MWIFIEX_SDIO_BLOCK_SIZE -
+				 1) / MWIFIEX_SDIO_BLOCK_SIZE;
+			if (rx_len <= INTF_HEADER_LEN
+			    || (rx_blocks * MWIFIEX_SDIO_BLOCK_SIZE) >
+			    MWIFIEX_RX_DATA_BUF_SIZE) {
+				dev_err(adapter->dev, "invalid rx_len=%d\n",
+						rx_len);
+				return -1;
+			}
+			rx_len = (u16) (rx_blocks * MWIFIEX_SDIO_BLOCK_SIZE);
+
+			skb = dev_alloc_skb(rx_len);
+
+			if (!skb) {
+				dev_err(adapter->dev, "%s: failed to alloc skb",
+								__func__);
+				return -1;
+			}
+
+			skb_put(skb, rx_len);
+
+			dev_dbg(adapter->dev, "info: rx_len = %d skb->len = %d\n",
+					rx_len, skb->len);
+
+			if (mwifiex_sdio_card_to_host_mp_aggr(adapter, skb,
+							      port)) {
+				u32 cr = 0;
+
+				dev_err(adapter->dev, "card_to_host_mpa failed:"
+						" int status=%#x\n", sdio_ireg);
+				if (mwifiex_read_reg(adapter,
+						     CONFIGURATION_REG, &cr))
+					dev_err(adapter->dev,
+							"read CFG reg failed\n");
+
+				dev_dbg(adapter->dev,
+						"info: CFG reg val = %d\n", cr);
+				if (mwifiex_write_reg(adapter,
+						      CONFIGURATION_REG,
+						      (cr | 0x04)))
+					dev_err(adapter->dev,
+							"write CFG reg failed\n");
+
+				dev_dbg(adapter->dev, "info: write success\n");
+				if (mwifiex_read_reg(adapter,
+						     CONFIGURATION_REG, &cr))
+					dev_err(adapter->dev,
+							"read CFG reg failed\n");
+
+				dev_dbg(adapter->dev,
+						"info: CFG reg val =%x\n", cr);
+				dev_kfree_skb_any(skb);
+				return -1;
+			}
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * This function aggregates transmission buffers in driver and downloads
+ * the aggregated packet to card.
+ *
+ * The individual packets are aggregated by copying into an aggregation
+ * buffer and then downloaded to the card. Previous unsent packets in the
+ * aggregation buffer are pre-copied first before new packets are added.
+ * Aggregation is done till there is space left in the aggregation buffer,
+ * or till new packets are available.
+ *
+ * The function will only download the packet to the card when aggregation
+ * stops, otherwise it will just aggregate the packet in aggregation buffer
+ * and return.
+ */
+static int mwifiex_host_to_card_mp_aggr(struct mwifiex_adapter *adapter,
+					u8 *payload, u32 pkt_len, u8 port,
+					u32 next_pkt_len)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	int ret = 0;
+	s32 f_send_aggr_buf = 0;
+	s32 f_send_cur_buf = 0;
+	s32 f_precopy_cur_buf = 0;
+	s32 f_postcopy_cur_buf = 0;
+
+	if ((!card->mpa_tx.enabled) || (port == CTRL_PORT)) {
+		dev_dbg(adapter->dev, "info: %s: tx aggregation disabled\n",
+						__func__);
+
+		f_send_cur_buf = 1;
+		goto tx_curr_single;
+	}
+
+	if (next_pkt_len) {
+		/* More pkt in TX queue */
+		dev_dbg(adapter->dev, "info: %s: more packets in queue.\n",
+						__func__);
+
+		if (MP_TX_AGGR_IN_PROGRESS(card)) {
+			if (!MP_TX_AGGR_PORT_LIMIT_REACHED(card) &&
+			    MP_TX_AGGR_BUF_HAS_ROOM(card, pkt_len)) {
+				f_precopy_cur_buf = 1;
+
+				if (!(card->mp_wr_bitmap &
+						(1 << card->curr_wr_port))
+						|| !MP_TX_AGGR_BUF_HAS_ROOM(
+							card, next_pkt_len))
+					f_send_aggr_buf = 1;
+			} else {
+				/* No room in Aggr buf, send it */
+				f_send_aggr_buf = 1;
+
+				if (MP_TX_AGGR_PORT_LIMIT_REACHED(card) ||
+				    !(card->mp_wr_bitmap &
+				      (1 << card->curr_wr_port)))
+					f_send_cur_buf = 1;
+				else
+					f_postcopy_cur_buf = 1;
+			}
+		} else {
+			if (MP_TX_AGGR_BUF_HAS_ROOM(card, pkt_len)
+			    && (card->mp_wr_bitmap & (1 << card->curr_wr_port)))
+				f_precopy_cur_buf = 1;
+			else
+				f_send_cur_buf = 1;
+		}
+	} else {
+		/* Last pkt in TX queue */
+		dev_dbg(adapter->dev, "info: %s: Last packet in Tx Queue.\n",
+						__func__);
+
+		if (MP_TX_AGGR_IN_PROGRESS(card)) {
+			/* some packs in Aggr buf already */
+			f_send_aggr_buf = 1;
+
+			if (MP_TX_AGGR_BUF_HAS_ROOM(card, pkt_len))
+				f_precopy_cur_buf = 1;
+			else
+				/* No room in Aggr buf, send it */
+				f_send_cur_buf = 1;
+		} else {
+			f_send_cur_buf = 1;
+		}
+	}
+
+	if (f_precopy_cur_buf) {
+		dev_dbg(adapter->dev, "data: %s: precopy current buffer\n",
+						__func__);
+		MP_TX_AGGR_BUF_PUT(card, payload, pkt_len, port);
+
+		if (MP_TX_AGGR_PKT_LIMIT_REACHED(card) ||
+		    MP_TX_AGGR_PORT_LIMIT_REACHED(card))
+			/* No more pkts allowed in Aggr buf, send it */
+			f_send_aggr_buf = 1;
+	}
+
+	if (f_send_aggr_buf) {
+		dev_dbg(adapter->dev, "data: %s: send aggr buffer: %d %d\n",
+				__func__,
+				card->mpa_tx.start_port, card->mpa_tx.ports);
+		ret = mwifiex_write_data_to_card(adapter, card->mpa_tx.buf,
+						 card->mpa_tx.buf_len,
+						 (adapter->ioport | 0x1000 |
+						 (card->mpa_tx.ports << 4)) +
+						  card->mpa_tx.start_port);
+
+		MP_TX_AGGR_BUF_RESET(card);
+	}
+
+tx_curr_single:
+	if (f_send_cur_buf) {
+		dev_dbg(adapter->dev, "data: %s: send current buffer %d\n",
+						__func__, port);
+		ret = mwifiex_write_data_to_card(adapter, payload, pkt_len,
+						 adapter->ioport + port);
+	}
+
+	if (f_postcopy_cur_buf) {
+		dev_dbg(adapter->dev, "data: %s: postcopy current buffer\n",
+						__func__);
+		MP_TX_AGGR_BUF_PUT(card, payload, pkt_len, port);
+	}
+
+	return ret;
+}
+
+/*
+ * This function downloads data from driver to card.
+ *
+ * Both commands and data packets are transferred to the card by this
+ * function.
+ *
+ * This function adds the SDIO specific header to the front of the buffer
+ * before transferring. The header contains the length of the packet and
+ * the type. The firmware handles the packets based upon this set type.
+ */
+static int mwifiex_sdio_host_to_card(struct mwifiex_adapter *adapter,
+				     u8 type, u8 *payload, u32 pkt_len,
+				     struct mwifiex_tx_param *tx_param)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	int ret = 0;
+	u32 buf_block_len;
+	u32 blk_size;
+	u8 port = CTRL_PORT;
+
+	/* Allocate buffer and copy payload */
+	blk_size = MWIFIEX_SDIO_BLOCK_SIZE;
+	buf_block_len = (pkt_len + blk_size - 1) / blk_size;
+	*(u16 *) &payload[0] = (u16) pkt_len;
+	*(u16 *) &payload[2] = type;
+
+	/*
+	 * This is SDIO specific header
+	 *  u16 length,
+	 *  u16 type (MWIFIEX_TYPE_DATA = 0, MWIFIEX_TYPE_CMD = 1,
+	 *  MWIFIEX_TYPE_EVENT = 3)
+	 */
+	if (type == MWIFIEX_TYPE_DATA) {
+		ret = mwifiex_get_wr_port_data(adapter, &port);
+		if (ret) {
+			dev_err(adapter->dev, "%s: no wr_port available\n",
+						__func__);
+			return ret;
+		}
+	} else {
+		adapter->cmd_sent = true;
+		/* Type must be MWIFIEX_TYPE_CMD */
+
+		if (pkt_len <= INTF_HEADER_LEN ||
+		    pkt_len > MWIFIEX_UPLD_SIZE)
+			dev_err(adapter->dev, "%s: payload=%p, nb=%d\n",
+					__func__, payload, pkt_len);
+	}
+
+	/* Transfer data to card */
+	pkt_len = buf_block_len * blk_size;
+
+	if (tx_param)
+		ret = mwifiex_host_to_card_mp_aggr(adapter, payload, pkt_len,
+				port, tx_param->next_pkt_len);
+	else
+		ret = mwifiex_host_to_card_mp_aggr(adapter, payload, pkt_len,
+				port, 0);
+
+	if (ret) {
+		if (type == MWIFIEX_TYPE_CMD)
+			adapter->cmd_sent = false;
+		if (type == MWIFIEX_TYPE_DATA)
+			adapter->data_sent = false;
+	} else {
+		if (type == MWIFIEX_TYPE_DATA) {
+			if (!(card->mp_wr_bitmap & (1 << card->curr_wr_port)))
+				adapter->data_sent = true;
+			else
+				adapter->data_sent = false;
+		}
+	}
+
+	return ret;
+}
+
+/*
+ * This function allocates the MPA Tx and Rx buffers.
+ */
+static int mwifiex_alloc_sdio_mpa_buffers(struct mwifiex_adapter *adapter,
+				   u32 mpa_tx_buf_size, u32 mpa_rx_buf_size)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	int ret = 0;
+
+	card->mpa_tx.buf = kzalloc(mpa_tx_buf_size, GFP_KERNEL);
+	if (!card->mpa_tx.buf) {
+		dev_err(adapter->dev, "could not alloc buffer for MP-A TX\n");
+		ret = -1;
+		goto error;
+	}
+
+	card->mpa_tx.buf_size = mpa_tx_buf_size;
+
+	card->mpa_rx.buf = kzalloc(mpa_rx_buf_size, GFP_KERNEL);
+	if (!card->mpa_rx.buf) {
+		dev_err(adapter->dev, "could not alloc buffer for MP-A RX\n");
+		ret = -1;
+		goto error;
+	}
+
+	card->mpa_rx.buf_size = mpa_rx_buf_size;
+
+error:
+	if (ret) {
+		kfree(card->mpa_tx.buf);
+		kfree(card->mpa_rx.buf);
+	}
+
+	return ret;
+}
+
+/*
+ * This function unregisters the SDIO device.
+ *
+ * The SDIO IRQ is released, the function is disabled and driver
+ * data is set to null.
+ */
+static void
+mwifiex_unregister_dev(struct mwifiex_adapter *adapter)
+{
+	struct sdio_mmc_card *card = adapter->card;
+
+	if (adapter->card) {
+		/* Release the SDIO IRQ */
+		sdio_claim_host(card->func);
+		sdio_release_irq(card->func);
+		sdio_disable_func(card->func);
+		sdio_release_host(card->func);
+		sdio_set_drvdata(card->func, NULL);
+	}
+}
+
+/*
+ * This function registers the SDIO device.
+ *
+ * SDIO IRQ is claimed, block size is set and driver data is initialized.
+ */
+static int mwifiex_register_dev(struct mwifiex_adapter *adapter)
+{
+	int ret = 0;
+	struct sdio_mmc_card *card = adapter->card;
+	struct sdio_func *func = card->func;
+
+	/* save adapter pointer in card */
+	card->adapter = adapter;
+
+	sdio_claim_host(func);
+
+	/* Request the SDIO IRQ */
+	ret = sdio_claim_irq(func, mwifiex_sdio_interrupt);
+	if (ret) {
+		pr_err("claim irq failed: ret=%d\n", ret);
+		goto disable_func;
+	}
+
+	/* Set block size */
+	ret = sdio_set_block_size(card->func, MWIFIEX_SDIO_BLOCK_SIZE);
+	if (ret) {
+		pr_err("cannot set SDIO block size\n");
+		ret = -1;
+		goto release_irq;
+	}
+
+	sdio_release_host(func);
+	sdio_set_drvdata(func, card);
+
+	adapter->dev = &func->dev;
+
+	return 0;
+
+release_irq:
+	sdio_release_irq(func);
+disable_func:
+	sdio_disable_func(func);
+	sdio_release_host(func);
+	adapter->card = NULL;
+
+	return -1;
+}
+
+/*
+ * This function initializes the SDIO driver.
+ *
+ * The following initializations steps are followed -
+ *      - Read the Host interrupt status register to acknowledge
+ *        the first interrupt got from bootloader
+ *      - Disable host interrupt mask register
+ *      - Get SDIO port
+ *      - Get revision ID
+ *      - Initialize SDIO variables in card
+ *      - Allocate MP registers
+ *      - Allocate MPA Tx and Rx buffers
+ */
+static int mwifiex_init_sdio(struct mwifiex_adapter *adapter)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	int ret;
+	u32 sdio_ireg = 0;
+
+	/*
+	 * Read the HOST_INT_STATUS_REG for ACK the first interrupt got
+	 * from the bootloader. If we don't do this we get a interrupt
+	 * as soon as we register the irq.
+	 */
+	mwifiex_read_reg(adapter, HOST_INTSTATUS_REG, &sdio_ireg);
+
+	/* Disable host interrupt mask register for SDIO */
+	mwifiex_sdio_disable_host_int(adapter);
+
+	/* Get SDIO ioport */
+	mwifiex_init_sdio_ioport(adapter);
+
+	/* Get revision ID */
+#define REV_ID_REG	0x5c
+	mwifiex_read_reg(adapter, REV_ID_REG, &adapter->revision_id);
+
+	/* Initialize SDIO variables in card */
+	card->mp_rd_bitmap = 0;
+	card->mp_wr_bitmap = 0;
+	card->curr_rd_port = 1;
+	card->curr_wr_port = 1;
+
+	card->mp_data_port_mask = DATA_PORT_MASK;
+
+	card->mpa_tx.buf_len = 0;
+	card->mpa_tx.pkt_cnt = 0;
+	card->mpa_tx.start_port = 0;
+
+	card->mpa_tx.enabled = 0;
+	card->mpa_tx.pkt_aggr_limit = SDIO_MP_AGGR_DEF_PKT_LIMIT;
+
+	card->mpa_rx.buf_len = 0;
+	card->mpa_rx.pkt_cnt = 0;
+	card->mpa_rx.start_port = 0;
+
+	card->mpa_rx.enabled = 0;
+	card->mpa_rx.pkt_aggr_limit = SDIO_MP_AGGR_DEF_PKT_LIMIT;
+
+	/* Allocate buffers for SDIO MP-A */
+	card->mp_regs = kzalloc(MAX_MP_REGS, GFP_KERNEL);
+	if (!card->mp_regs) {
+		dev_err(adapter->dev, "failed to alloc mp_regs\n");
+		return -1;
+	}
+
+	ret = mwifiex_alloc_sdio_mpa_buffers(adapter,
+					     SDIO_MP_TX_AGGR_DEF_BUF_SIZE,
+					     SDIO_MP_RX_AGGR_DEF_BUF_SIZE);
+	if (ret) {
+		dev_err(adapter->dev, "failed to alloc sdio mp-a buffers\n");
+		kfree(card->mp_regs);
+		return -1;
+	}
+
+	return ret;
+}
+
+/*
+ * This function resets the MPA Tx and Rx buffers.
+ */
+static void mwifiex_cleanup_mpa_buf(struct mwifiex_adapter *adapter)
+{
+	struct sdio_mmc_card *card = adapter->card;
+
+	MP_TX_AGGR_BUF_RESET(card);
+	MP_RX_AGGR_BUF_RESET(card);
+}
+
+/*
+ * This function cleans up the allocated card buffers.
+ *
+ * The following are freed by this function -
+ *      - MP registers
+ *      - MPA Tx buffer
+ *      - MPA Rx buffer
+ */
+static void mwifiex_cleanup_sdio(struct mwifiex_adapter *adapter)
+{
+	struct sdio_mmc_card *card = adapter->card;
+
+	kfree(card->mp_regs);
+	kfree(card->mpa_tx.buf);
+	kfree(card->mpa_rx.buf);
+}
+
+/*
+ * This function updates the MP end port in card.
+ */
+static void
+mwifiex_update_mp_end_port(struct mwifiex_adapter *adapter, u16 port)
+{
+	struct sdio_mmc_card *card = adapter->card;
+	int i;
+
+	card->mp_end_port = port;
+
+	card->mp_data_port_mask = DATA_PORT_MASK;
+
+	for (i = 1; i <= MAX_PORT - card->mp_end_port; i++)
+		card->mp_data_port_mask &= ~(1 << (MAX_PORT - i));
+
+	card->curr_wr_port = 1;
+
+	dev_dbg(adapter->dev, "cmd: mp_end_port %d, data port mask 0x%x\n",
+	       port, card->mp_data_port_mask);
+}
+
+static struct mwifiex_if_ops sdio_ops = {
+	.init_if = mwifiex_init_sdio,
+	.cleanup_if = mwifiex_cleanup_sdio,
+	.check_fw_status = mwifiex_check_fw_status,
+	.prog_fw = mwifiex_prog_fw_w_helper,
+	.register_dev = mwifiex_register_dev,
+	.unregister_dev = mwifiex_unregister_dev,
+	.enable_int = mwifiex_sdio_enable_host_int,
+	.process_int_status = mwifiex_process_int_status,
+	.host_to_card = mwifiex_sdio_host_to_card,
+	.wakeup = mwifiex_pm_wakeup_card,
+	.wakeup_complete = mwifiex_pm_wakeup_card_complete,
+
+	/* SDIO specific */
+	.update_mp_end_port = mwifiex_update_mp_end_port,
+	.cleanup_mpa_buf = mwifiex_cleanup_mpa_buf,
+};
+
+/*
+ * This function initializes the SDIO driver.
+ *
+ * This initiates the semaphore and registers the device with
+ * SDIO bus.
+ */
+static int
+mwifiex_sdio_init_module(void)
+{
+	int ret;
+
+	sema_init(&add_remove_card_sem, 1);
+
+	ret = sdio_register_driver(&mwifiex_sdio);
+
+	return ret;
+}
+
+/*
+ * This function cleans up the SDIO driver.
+ *
+ * The following major steps are followed for cleanup -
+ *      - Resume the device if its suspended
+ *      - Disconnect the device if connected
+ *      - Shutdown the firmware
+ *      - Unregister the device from SDIO bus.
+ */
+static void
+mwifiex_sdio_cleanup_module(void)
+{
+	struct mwifiex_adapter *adapter = g_adapter;
+	int i;
+
+	if (down_interruptible(&add_remove_card_sem))
+		goto exit_sem_err;
+
+	if (!adapter || !adapter->priv_num)
+		goto exit;
+
+	if (adapter->is_suspended)
+		mwifiex_sdio_resume(adapter->dev);
+
+	for (i = 0; i < adapter->priv_num; i++)
+		if ((GET_BSS_ROLE(adapter->priv[i]) == MWIFIEX_BSS_ROLE_STA) &&
+		    adapter->priv[i]->media_connected)
+			mwifiex_disconnect(adapter->priv[i], MWIFIEX_CMD_WAIT,
+					   NULL);
+
+	if (!adapter->surprise_removed)
+		mwifiex_shutdown_fw(mwifiex_get_priv
+				    (adapter, MWIFIEX_BSS_ROLE_ANY),
+				    MWIFIEX_CMD_WAIT);
+
+exit:
+	up(&add_remove_card_sem);
+
+exit_sem_err:
+	sdio_unregister_driver(&mwifiex_sdio);
+}
+
+module_init(mwifiex_sdio_init_module);
+module_exit(mwifiex_sdio_cleanup_module);
+
+MODULE_AUTHOR("Marvell International Ltd.");
+MODULE_DESCRIPTION("Marvell WiFi-Ex SDIO Driver version " SDIO_VERSION);
+MODULE_VERSION(SDIO_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_FIRMWARE("sd8787.bin");