/*
 * Marvell Wireless LAN device driver: SDIO specific handling
 *
 * Copyright (C) 2011-2014, 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"

/* The mwifiex_sdio_remove() callback function is called when
 * user removes this module from kernel space or ejects
 * the card from the slot. The driver handles these 2 cases
 * differently.
 * If the user is removing the module, the few commands (FUNC_SHUTDOWN,
 * HS_CANCEL etc.) are sent to the firmware.
 * If the card is removed, there is no need to send these command.
 *
 * The variable 'user_rmmod' is used to distinguish these two
 * scenarios. This flag is initialized as FALSE in case the card
 * is removed, and will be set to TRUE for module removal when
 * module_exit function is called.
 */
static u8 user_rmmod;

static struct mwifiex_if_ops sdio_ops;
static unsigned long iface_work_flags;

static struct semaphore add_remove_card_sem;

static struct memory_type_mapping generic_mem_type_map[] = {
        {"DUMP", NULL, 0, 0xDD},
};

static struct memory_type_mapping mem_type_mapping_tbl[] = {
        {"ITCM", NULL, 0, 0xF0},
        {"DTCM", NULL, 0, 0xF1},
        {"SQRAM", NULL, 0, 0xF2},
        {"APU", NULL, 0, 0xF3},
        {"CIU", NULL, 0, 0xF4},
        {"ICU", NULL, 0, 0xF5},
        {"MAC", NULL, 0, 0xF6},
        {"EXT7", NULL, 0, 0xF7},
        {"EXT8", NULL, 0, 0xF8},
        {"EXT9", NULL, 0, 0xF9},
        {"EXT10", NULL, 0, 0xFA},
        {"EXT11", NULL, 0, 0xFB},
        {"EXT12", NULL, 0, 0xFC},
        {"EXT13", NULL, 0, 0xFD},
        {"EXTLAST", NULL, 0, 0xFE},
};

static const struct of_device_id mwifiex_sdio_of_match_table[] = {
        { .compatible = "marvell,sd8897" },
        { .compatible = "marvell,sd8997" },
        { }
};

static irqreturn_t mwifiex_wake_irq_wifi(int irq, void *priv)
{
        struct mwifiex_plt_wake_cfg *cfg = priv;

        if (cfg->irq_wifi >= 0) {
                pr_info("%s: wake by wifi", __func__);
                cfg->wake_by_wifi = true;
                disable_irq_nosync(irq);
        }

        return IRQ_HANDLED;
}

/* This function parse device tree node using mmc subnode devicetree API.
 * The device node is saved in card->plt_of_node.
 * if the device tree node exist and include interrupts attributes, this
 * function will also request platform specific wakeup interrupt.
 */
static int mwifiex_sdio_probe_of(struct device *dev, struct sdio_mmc_card *card)
{
        struct mwifiex_plt_wake_cfg *cfg;
        int ret;

        if (!of_match_node(mwifiex_sdio_of_match_table, dev->of_node)) {
                dev_err(dev, "required compatible string missing\n");
                return -EINVAL;
        }

        card->plt_of_node = dev->of_node;
        card->plt_wake_cfg = devm_kzalloc(dev, sizeof(*card->plt_wake_cfg),
                                          GFP_KERNEL);
        cfg = card->plt_wake_cfg;
        if (cfg && card->plt_of_node) {
                cfg->irq_wifi = irq_of_parse_and_map(card->plt_of_node, 0);
                if (!cfg->irq_wifi) {
                        dev_dbg(dev,
                                "fail to parse irq_wifi from device tree\n");
                } else {
                        ret = devm_request_irq(dev, cfg->irq_wifi,
                                               mwifiex_wake_irq_wifi,
                                               IRQF_TRIGGER_LOW,
                                               "wifi_wake", cfg);
                        if (ret) {
                                dev_dbg(dev,
                                        "Failed to request irq_wifi %d (%d)\n",
                                        cfg->irq_wifi, ret);
                                card->plt_wake_cfg = NULL;
                                return 0;
                        }
                        disable_irq(cfg->irq_wifi);
                }
        }

        return 0;
}

/*
 * 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;
        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)
                return -ENOMEM;

        card->func = func;
        card->device_id = id;

        func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;

        if (id->driver_data) {
                struct mwifiex_sdio_device *data = (void *)id->driver_data;

                card->firmware = data->firmware;
                card->reg = data->reg;
                card->max_ports = data->max_ports;
                card->mp_agg_pkt_limit = data->mp_agg_pkt_limit;
                card->supports_sdio_new_mode = data->supports_sdio_new_mode;
                card->has_control_mask = data->has_control_mask;
                card->tx_buf_size = data->tx_buf_size;
                card->mp_tx_agg_buf_size = data->mp_tx_agg_buf_size;
                card->mp_rx_agg_buf_size = data->mp_rx_agg_buf_size;
                card->can_dump_fw = data->can_dump_fw;
                card->fw_dump_enh = data->fw_dump_enh;
                card->can_auto_tdls = data->can_auto_tdls;
                card->can_ext_scan = data->can_ext_scan;
        }

        sdio_claim_host(func);
        ret = sdio_enable_func(func);
        sdio_release_host(func);

        if (ret) {
                dev_err(&func->dev, "failed to enable function\n");
                goto err_free;
        }

        /* device tree node parsing and platform specific configuration*/
        if (func->dev.of_node) {
                ret = mwifiex_sdio_probe_of(&func->dev, card);
                if (ret) {
                        dev_err(&func->dev, "SDIO dt node parse failed\n");
                        goto err_disable;
                }
        }

        ret = mwifiex_add_card(card, &add_remove_card_sem, &sdio_ops,
                               MWIFIEX_SDIO);
        if (ret) {
                dev_err(&func->dev, "add card failed\n");
                goto err_disable;
        }

        return 0;

err_disable:
        sdio_claim_host(func);
        sdio_disable_func(func);
        sdio_release_host(func);
err_free:
        kfree(card);

        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;
        mmc_pm_flag_t pm_flag = 0;

        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) {
                mwifiex_dbg(adapter, WARN,
                            "device already resumed\n");
                return 0;
        }

        adapter->is_suspended = false;

        /* Disable Host Sleep */
        mwifiex_cancel_hs(mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA),
                          MWIFIEX_SYNC_CMD);

        /* Disable platform specific wakeup interrupt */
        if (card->plt_wake_cfg && card->plt_wake_cfg->irq_wifi >= 0) {
                disable_irq_wake(card->plt_wake_cfg->irq_wifi);
                if (!card->plt_wake_cfg->wake_by_wifi)
                        disable_irq(card->plt_wake_cfg->irq_wifi);
        }

        return 0;
}

/*
 * 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;
        struct mwifiex_adapter *adapter;
        struct mwifiex_private *priv;

        card = sdio_get_drvdata(func);
        if (!card)
                return;

        adapter = card->adapter;
        if (!adapter || !adapter->priv_num)
                return;

        mwifiex_dbg(adapter, INFO, "info: SDIO func num=%d\n", func->num);

        if (user_rmmod && !adapter->mfg_mode) {
                if (adapter->is_suspended)
                        mwifiex_sdio_resume(adapter->dev);

                mwifiex_deauthenticate_all(adapter);

                priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
                mwifiex_disable_auto_ds(priv);
                mwifiex_init_shutdown_fw(priv, MWIFIEX_FUNC_SHUTDOWN);
        }

        mwifiex_remove_card(card->adapter, &add_remove_card_sem);
}

/*
 * 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;
        mmc_pm_flag_t pm_flag = 0;
        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 platform specific wakeup interrupt */
        if (card->plt_wake_cfg && card->plt_wake_cfg->irq_wifi >= 0) {
                card->plt_wake_cfg->wake_by_wifi = false;
                enable_irq(card->plt_wake_cfg->irq_wifi);
                enable_irq_wake(card->plt_wake_cfg->irq_wifi);
        }

        /* Enable the Host Sleep */
        if (!mwifiex_enable_hs(adapter)) {
                mwifiex_dbg(adapter, ERROR,
                            "cmd: failed to suspend\n");
                adapter->hs_enabling = false;
                return -EFAULT;
        }

        mwifiex_dbg(adapter, INFO,
                    "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;
        adapter->hs_enabling = false;

        return ret;
}

/* Device ID for SD8786 */
#define SDIO_DEVICE_ID_MARVELL_8786   (0x9116)
/* Device ID for SD8787 */
#define SDIO_DEVICE_ID_MARVELL_8787   (0x9119)
/* Device ID for SD8797 */
#define SDIO_DEVICE_ID_MARVELL_8797   (0x9129)
/* Device ID for SD8897 */
#define SDIO_DEVICE_ID_MARVELL_8897   (0x912d)
/* Device ID for SD8887 */
#define SDIO_DEVICE_ID_MARVELL_8887   (0x9135)
/* Device ID for SD8801 */
#define SDIO_DEVICE_ID_MARVELL_8801   (0x9139)
/* Device ID for SD8997 */
#define SDIO_DEVICE_ID_MARVELL_8997   (0x9141)


/* WLAN IDs */
static const struct sdio_device_id mwifiex_ids[] = {
        {SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8786),
                .driver_data = (unsigned long) &mwifiex_sdio_sd8786},
        {SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8787),
                .driver_data = (unsigned long) &mwifiex_sdio_sd8787},
        {SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8797),
                .driver_data = (unsigned long) &mwifiex_sdio_sd8797},
        {SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8897),
                .driver_data = (unsigned long) &mwifiex_sdio_sd8897},
        {SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8887),
                .driver_data = (unsigned long)&mwifiex_sdio_sd8887},
        {SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8801),
                .driver_data = (unsigned long)&mwifiex_sdio_sd8801},
        {SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8997),
                .driver_data = (unsigned long)&mwifiex_sdio_sd8997},
        {},
};

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,
        }
};

/* Write data into SDIO card register. Caller claims SDIO device. */
static int
mwifiex_write_reg_locked(struct sdio_func *func, u32 reg, u8 data)
{
        int ret = -1;
        sdio_writeb(func, data, reg, &ret);
        return ret;
}

/*
 * This function writes data into SDIO card register.
 */
static int
mwifiex_write_reg(struct mwifiex_adapter *adapter, u32 reg, u8 data)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret;

        sdio_claim_host(card->func);
        ret = mwifiex_write_reg_locked(card->func, reg, data);
        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, u8 *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)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret;
        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) {
                mwifiex_dbg(adapter, ERROR,
                            "%s: not allowed while suspended\n", __func__);
                return -1;
        }

        sdio_claim_host(card->func);

        ret = sdio_writesb(card->func, ioport, buffer, blk_cnt * blk_size);

        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, u8 claim)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret;
        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);

        ret = sdio_readsb(card->func, buffer, ioport, blk_cnt * blk_size);

        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)
{
        mwifiex_dbg(adapter, EVENT,
                    "event: wakeup device...\n");

        return mwifiex_write_reg(adapter, CONFIGURATION_REG, HOST_POWER_UP);
}

/*
 * 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)
{
        mwifiex_dbg(adapter, EVENT,
                    "cmd: wakeup device completed\n");

        return mwifiex_write_reg(adapter, CONFIGURATION_REG, 0);
}

static int mwifiex_sdio_dnld_fw(struct mwifiex_adapter *adapter,
                        struct mwifiex_fw_image *fw)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret;

        sdio_claim_host(card->func);
        ret = mwifiex_dnld_fw(adapter, fw);
        sdio_release_host(card->func);

        return ret;
}

/*
 * This function is used to initialize IO ports for the
 * chipsets supporting SDIO new mode eg SD8897.
 */
static int mwifiex_init_sdio_new_mode(struct mwifiex_adapter *adapter)
{
        u8 reg;
        struct sdio_mmc_card *card = adapter->card;

        adapter->ioport = MEM_PORT;

        /* enable sdio new mode */
        if (mwifiex_read_reg(adapter, card->reg->card_cfg_2_1_reg, &reg))
                return -1;
        if (mwifiex_write_reg(adapter, card->reg->card_cfg_2_1_reg,
                              reg | CMD53_NEW_MODE))
                return -1;

        /* Configure cmd port and enable reading rx length from the register */
        if (mwifiex_read_reg(adapter, card->reg->cmd_cfg_0, &reg))
                return -1;
        if (mwifiex_write_reg(adapter, card->reg->cmd_cfg_0,
                              reg | CMD_PORT_RD_LEN_EN))
                return -1;

        /* Enable Dnld/Upld ready auto reset for cmd port after cmd53 is
         * completed
         */
        if (mwifiex_read_reg(adapter, card->reg->cmd_cfg_1, &reg))
                return -1;
        if (mwifiex_write_reg(adapter, card->reg->cmd_cfg_1,
                              reg | CMD_PORT_AUTO_EN))
                return -1;

        return 0;
}

/* 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)
{
        u8 reg;
        struct sdio_mmc_card *card = adapter->card;

        adapter->ioport = 0;

        if (card->supports_sdio_new_mode) {
                if (mwifiex_init_sdio_new_mode(adapter))
                        return -1;
                goto cont;
        }

        /* Read the IO port */
        if (!mwifiex_read_reg(adapter, card->reg->io_port_0_reg, &reg))
                adapter->ioport |= (reg & 0xff);
        else
                return -1;

        if (!mwifiex_read_reg(adapter, card->reg->io_port_1_reg, &reg))
                adapter->ioport |= ((reg & 0xff) << 8);
        else
                return -1;

        if (!mwifiex_read_reg(adapter, card->reg->io_port_2_reg, &reg))
                adapter->ioport |= ((reg & 0xff) << 16);
        else
                return -1;
cont:
        mwifiex_dbg(adapter, INFO,
                    "info: SDIO FUNC1 IO port: %#x\n", adapter->ioport);

        /* Set Host interrupt reset to read to clear */
        if (!mwifiex_read_reg(adapter, card->reg->host_int_rsr_reg, &reg))
                mwifiex_write_reg(adapter, card->reg->host_int_rsr_reg,
                                  reg | card->reg->sdio_int_mask);
        else
                return -1;

        /* Dnld/Upld ready set to auto reset */
        if (!mwifiex_read_reg(adapter, card->reg->card_misc_cfg_reg, &reg))
                mwifiex_write_reg(adapter, card->reg->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;

        do {
                ret = mwifiex_write_data_sync(adapter, payload, pkt_len, port);
                if (ret) {
                        i++;
                        mwifiex_dbg(adapter, ERROR,
                                    "host_to_card, write iomem\t"
                                    "(%d) failed: %d\n", i, ret);
                        if (mwifiex_write_reg(adapter, CONFIGURATION_REG, 0x04))
                                mwifiex_dbg(adapter, ERROR,
                                            "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;
        const struct mwifiex_sdio_card_reg *reg = card->reg;
        u32 rd_bitmap = card->mp_rd_bitmap;

        mwifiex_dbg(adapter, DATA,
                    "data: mp_rd_bitmap=0x%08x\n", rd_bitmap);

        if (card->supports_sdio_new_mode) {
                if (!(rd_bitmap & reg->data_port_mask))
                        return -1;
        } else {
                if (!(rd_bitmap & (CTRL_PORT_MASK | reg->data_port_mask)))
                        return -1;
        }

        if ((card->has_control_mask) &&
            (card->mp_rd_bitmap & CTRL_PORT_MASK)) {
                card->mp_rd_bitmap &= (u32) (~CTRL_PORT_MASK);
                *port = CTRL_PORT;
                mwifiex_dbg(adapter, DATA,
                            "data: port=%d mp_rd_bitmap=0x%08x\n",
                            *port, card->mp_rd_bitmap);
                return 0;
        }

        if (!(card->mp_rd_bitmap & (1 << card->curr_rd_port)))
                return -1;

        /* We are now handling the SDIO data ports */
        card->mp_rd_bitmap &= (u32)(~(1 << card->curr_rd_port));
        *port = card->curr_rd_port;

        if (++card->curr_rd_port == card->max_ports)
                card->curr_rd_port = reg->start_rd_port;

        mwifiex_dbg(adapter, DATA,
                    "data: port=%d mp_rd_bitmap=0x%08x -> 0x%08x\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, u32 *port)
{
        struct sdio_mmc_card *card = adapter->card;
        const struct mwifiex_sdio_card_reg *reg = card->reg;
        u32 wr_bitmap = card->mp_wr_bitmap;

        mwifiex_dbg(adapter, DATA,
                    "data: mp_wr_bitmap=0x%08x\n", wr_bitmap);

        if (!(wr_bitmap & card->mp_data_port_mask)) {
                adapter->data_sent = true;
                return -EBUSY;
        }

        if (card->mp_wr_bitmap & (1 << card->curr_wr_port)) {
                card->mp_wr_bitmap &= (u32) (~(1 << card->curr_wr_port));
                *port = card->curr_wr_port;
                if (++card->curr_wr_port == card->mp_end_port)
                        card->curr_wr_port = reg->start_wr_port;
        } else {
                adapter->data_sent = true;
                return -EBUSY;
        }

        if ((card->has_control_mask) && (*port == CTRL_PORT)) {
                mwifiex_dbg(adapter, ERROR,
                            "invalid data port=%d cur port=%d mp_wr_bitmap=0x%08x -> 0x%08x\n",
                            *port, card->curr_wr_port, wr_bitmap,
                            card->mp_wr_bitmap);
                return -1;
        }

        mwifiex_dbg(adapter, DATA,
                    "data: port=%d mp_wr_bitmap=0x%08x -> 0x%08x\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)
{
        struct sdio_mmc_card *card = adapter->card;
        u32 tries;
        u8 cs;

        for (tries = 0; tries < MAX_POLL_TRIES; tries++) {
                if (mwifiex_read_reg(adapter, card->reg->poll_reg, &cs))
                        break;
                else if ((cs & bits) == bits)
                        return 0;

                usleep_range(10, 20);
        }

        mwifiex_dbg(adapter, ERROR,
                    "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)
{
        struct sdio_mmc_card *card = adapter->card;
        const struct mwifiex_sdio_card_reg *reg = card->reg;
        u8 fws0, fws1;

        if (mwifiex_read_reg(adapter, reg->status_reg_0, &fws0))
                return -1;

        if (mwifiex_read_reg(adapter, reg->status_reg_1, &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 void mwifiex_sdio_disable_host_int(struct mwifiex_adapter *adapter)
{
        struct sdio_mmc_card *card = adapter->card;
        struct sdio_func *func = card->func;

        sdio_claim_host(func);
        mwifiex_write_reg_locked(func, card->reg->host_int_mask_reg, 0);
        sdio_release_irq(func);
        sdio_release_host(func);
}

/*
 * This function reads the interrupt status from card.
 */
static void mwifiex_interrupt_status(struct mwifiex_adapter *adapter)
{
        struct sdio_mmc_card *card = adapter->card;
        u8 sdio_ireg;
        unsigned long flags;

        if (mwifiex_read_data_sync(adapter, card->mp_regs,
                                   card->reg->max_mp_regs,
                                   REG_PORT | MWIFIEX_SDIO_BYTE_MODE_MASK, 0)) {
                mwifiex_dbg(adapter, ERROR, "read mp_regs failed\n");
                return;
        }

        sdio_ireg = card->mp_regs[card->reg->host_int_status_reg];
        if (sdio_ireg) {
                /*
                 * DN_LD_HOST_INT_STATUS and/or UP_LD_HOST_INT_STATUS
                 * For SDIO new mode CMD port interrupts
                 *      DN_LD_CMD_PORT_HOST_INT_STATUS and/or
                 *      UP_LD_CMD_PORT_HOST_INT_STATUS
                 * Clear the interrupt status register
                 */
                mwifiex_dbg(adapter, INTR,
                            "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);
        }
}

/*
 * SDIO interrupt handler.
 *
 * This function reads the interrupt status from firmware and handles
 * the interrupt in current thread (ksdioirqd) right away.
 */
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_err("int: func=%p card=%p adapter=%p\n",
                       func, card, card ? card->adapter : NULL);
                return;
        }
        adapter = card->adapter;

        if (!adapter->pps_uapsd_mode && adapter->ps_state == PS_STATE_SLEEP)
                adapter->ps_state = PS_STATE_AWAKE;

        mwifiex_interrupt_status(adapter);
        mwifiex_main_process(adapter);
}

/*
 * 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)
{
        struct sdio_mmc_card *card = adapter->card;
        struct sdio_func *func = card->func;
        int ret;

        sdio_claim_host(func);

        /* Request the SDIO IRQ */
        ret = sdio_claim_irq(func, mwifiex_sdio_interrupt);
        if (ret) {
                mwifiex_dbg(adapter, ERROR,
                            "claim irq failed: ret=%d\n", ret);
                goto out;
        }

        /* Simply write the mask to the register */
        ret = mwifiex_write_reg_locked(func, card->reg->host_int_mask_reg,
                                       card->reg->host_int_enable);
        if (ret) {
                mwifiex_dbg(adapter, ERROR,
                            "enable host interrupt failed\n");
                sdio_release_irq(func);
        }

out:
        sdio_release_host(func);
        return ret;
}

/*
 * 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;
        u32 nb;

        if (!buffer) {
                mwifiex_dbg(adapter, ERROR,
                            "%s: buffer is NULL\n", __func__);
                return -1;
        }

        ret = mwifiex_read_data_sync(adapter, buffer, npayload, ioport, 1);

        if (ret) {
                mwifiex_dbg(adapter, ERROR,
                            "%s: read iomem failed: %d\n", __func__,
                        ret);
                return -1;
        }

        nb = le16_to_cpu(*(__le16 *) (buffer));
        if (nb > npayload) {
                mwifiex_dbg(adapter, ERROR,
                            "%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)
{
        struct sdio_mmc_card *card = adapter->card;
        const struct mwifiex_sdio_card_reg *reg = card->reg;

        int ret;
        u8 *firmware = fw->fw_buf;
        u32 firmware_len = fw->fw_len;
        u32 offset = 0;
        u8 base0, base1;
        u8 *fwbuf;
        u16 len = 0;
        u32 txlen, tx_blocks = 0, tries;
        u32 i = 0;

        if (!firmware_len) {
                mwifiex_dbg(adapter, ERROR,
                            "firmware image not found! Terminating download\n");
                return -1;
        }

        mwifiex_dbg(adapter, INFO,
                    "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)
                return -ENOMEM;

        sdio_claim_host(card->func);

        /* 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) {
                        mwifiex_dbg(adapter, ERROR,
                                    "FW download with helper:\t"
                                    "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, reg->base_0_reg,
                                               &base0);
                        if (ret) {
                                mwifiex_dbg(adapter, ERROR,
                                            "dev BASE0 register read failed:\t"
                                            "base0=%#04X(%d). Terminating dnld\n",
                                            base0, base0);
                                goto done;
                        }
                        ret = mwifiex_read_reg(adapter, reg->base_1_reg,
                                               &base1);
                        if (ret) {
                                mwifiex_dbg(adapter, ERROR,
                                            "dev BASE1 register read failed:\t"
                                            "base1=%#04X(%d). Terminating dnld\n",
                                            base1, base1);
                                goto done;
                        }
                        len = (u16) (((base1 & 0xff) << 8) | (base0 & 0xff));

                        if (len)
                                break;

                        usleep_range(10, 20);
                }

                if (!len) {
                        break;
                } else if (len > MWIFIEX_UPLD_SIZE) {
                        mwifiex_dbg(adapter, ERROR,
                                    "FW dnld 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) {
                                mwifiex_dbg(adapter, ERROR,
                                            "FW dnld failed @ %d, over max retry\n",
                                            offset);
                                ret = -1;
                                goto done;
                        }
                        mwifiex_dbg(adapter, ERROR,
                                    "CRC indicated by the helper:\t"
                                    "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);
                if (ret) {
                        mwifiex_dbg(adapter, ERROR,
                                    "FW download, write iomem (%d) failed @ %d\n",
                                    i, offset);
                        if (mwifiex_write_reg(adapter, CONFIGURATION_REG, 0x04))
                                mwifiex_dbg(adapter, ERROR,
                                            "write CFG reg failed\n");

                        ret = -1;
                        goto done;
                }

                offset += txlen;
        } while (true);

        mwifiex_dbg(adapter, MSG,
                    "info: FW download over, size %d bytes\n", offset);

        ret = 0;
done:
        sdio_release_host(card->func);
        kfree(fwbuf);
        return ret;
}

/*
 * This function checks the firmware status in card.
 */
static int mwifiex_check_fw_status(struct mwifiex_adapter *adapter,
                                   u32 poll_num)
{
        int ret = 0;
        u16 firmware_stat;
        u32 tries;

        for (tries = 0; tries < poll_num; tries++) {
                ret = mwifiex_sdio_read_fw_status(adapter, &firmware_stat);
                if (ret)
                        continue;
                if (firmware_stat == FIRMWARE_READY_SDIO) {
                        ret = 0;
                        break;
                } else {
                        msleep(100);
                        ret = -1;
                }
        }

        return ret;
}

/* This function checks if WLAN is the winner.
 */
static int mwifiex_check_winner_status(struct mwifiex_adapter *adapter)
{
        int ret = 0;
        u8 winner = 0;
        struct sdio_mmc_card *card = adapter->card;

        if (mwifiex_read_reg(adapter, card->reg->status_reg_0, &winner))
                return -1;

        if (winner)
                adapter->winner = 0;
        else
                adapter->winner = 1;

        return ret;
}

/*
 * This function decode sdio aggreation pkt.
 *
 * Based on the the data block size and pkt_len,
 * skb data will be decoded to few packets.
 */
static void mwifiex_deaggr_sdio_pkt(struct mwifiex_adapter *adapter,
                                    struct sk_buff *skb)
{
        u32 total_pkt_len, pkt_len;
        struct sk_buff *skb_deaggr;
        u32 pkt_type;
        u16 blk_size;
        u8 blk_num;
        u8 *data;

        data = skb->data;
        total_pkt_len = skb->len;

        while (total_pkt_len >= (SDIO_HEADER_OFFSET + INTF_HEADER_LEN)) {
                if (total_pkt_len < adapter->sdio_rx_block_size)
                        break;
                blk_num = *(data + BLOCK_NUMBER_OFFSET);
                blk_size = adapter->sdio_rx_block_size * blk_num;
                if (blk_size > total_pkt_len) {
                        mwifiex_dbg(adapter, ERROR,
                                    "%s: error in blk_size,\t"
                                    "blk_num=%d, blk_size=%d, total_pkt_len=%d\n",
                                    __func__, blk_num, blk_size, total_pkt_len);
                        break;
                }
                pkt_len = le16_to_cpu(*(__le16 *)(data + SDIO_HEADER_OFFSET));
                pkt_type = le16_to_cpu(*(__le16 *)(data + SDIO_HEADER_OFFSET +
                                         2));
                if ((pkt_len + SDIO_HEADER_OFFSET) > blk_size) {
                        mwifiex_dbg(adapter, ERROR,
                                    "%s: error in pkt_len,\t"
                                    "pkt_len=%d, blk_size=%d\n",
                                    __func__, pkt_len, blk_size);
                        break;
                }

                skb_deaggr = mwifiex_alloc_dma_align_buf(pkt_len, GFP_KERNEL);
                if (!skb_deaggr)
                        break;
                skb_put(skb_deaggr, pkt_len);
                memcpy(skb_deaggr->data, data + SDIO_HEADER_OFFSET, pkt_len);
                skb_pull(skb_deaggr, INTF_HEADER_LEN);

                mwifiex_handle_rx_packet(adapter, skb_deaggr);
                data += blk_size;
                total_pkt_len -= blk_size;
        }
}

/*
 * 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;
        __le16 *curr_ptr = (__le16 *)skb->data;
        u16 pkt_len = le16_to_cpu(*curr_ptr);
        struct mwifiex_rxinfo *rx_info;

        if (upld_typ != MWIFIEX_TYPE_AGGR_DATA) {
                skb_trim(skb, pkt_len);
                skb_pull(skb, INTF_HEADER_LEN);
        }

        switch (upld_typ) {
        case MWIFIEX_TYPE_AGGR_DATA:
                mwifiex_dbg(adapter, INFO,
                            "info: --- Rx: Aggr Data packet ---\n");
                rx_info = MWIFIEX_SKB_RXCB(skb);
                rx_info->buf_type = MWIFIEX_TYPE_AGGR_DATA;
                if (adapter->rx_work_enabled) {
                        skb_queue_tail(&adapter->rx_data_q, skb);
                        atomic_inc(&adapter->rx_pending);
                        adapter->data_received = true;
                } else {
                        mwifiex_deaggr_sdio_pkt(adapter, skb);
                        dev_kfree_skb_any(skb);
                }
                break;

        case MWIFIEX_TYPE_DATA:
                mwifiex_dbg(adapter, DATA,
                            "info: --- Rx: Data packet ---\n");
                if (adapter->rx_work_enabled) {
                        skb_queue_tail(&adapter->rx_data_q, skb);
                        adapter->data_received = true;
                        atomic_inc(&adapter->rx_pending);
                } else {
                        mwifiex_handle_rx_packet(adapter, skb);
                }
                break;

        case MWIFIEX_TYPE_CMD:
                mwifiex_dbg(adapter, CMD,
                            "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:
                mwifiex_dbg(adapter, EVENT,
                            "info: --- Rx: Event ---\n");
                adapter->event_cause = le32_to_cpu(*(__le32 *) skb->data);

                if ((skb->len > 0) && (skb->len  < MAX_EVENT_SIZE))
                        memcpy(adapter->event_body,
                               skb->data + MWIFIEX_EVENT_HEADER_LEN,
                               skb->len);

                /* event cause has been saved to adapter->event_cause */
                adapter->event_received = true;
                adapter->event_skb = skb;

                break;

        default:
                mwifiex_dbg(adapter, ERROR,
                            "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,
                                             u16 rx_len, 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;
        s32 f_post_aggr_cur = 0;
        struct sk_buff *skb_deaggr;
        struct sk_buff *skb = NULL;
        u32 pkt_len, pkt_type, mport, pind;
        u8 *curr_ptr;

        if ((card->has_control_mask) && (port == CTRL_PORT)) {
                /* Read the command Resp without aggr */
                mwifiex_dbg(adapter, CMD,
                            "info: %s: no aggregation for cmd\t"
                            "response\n", __func__);

                f_do_rx_cur = 1;
                goto rx_curr_single;
        }

        if (!card->mpa_rx.enabled) {
                mwifiex_dbg(adapter, WARN,
                            "info: %s: rx aggregation disabled\n",
                            __func__);

                f_do_rx_cur = 1;
                goto rx_curr_single;
        }

        if ((!card->has_control_mask && (card->mp_rd_bitmap &
                                         card->reg->data_port_mask)) ||
            (card->has_control_mask && (card->mp_rd_bitmap &
                                        (~((u32) CTRL_PORT_MASK))))) {
                /* Some more data RX pending */
                mwifiex_dbg(adapter, INFO,
                            "info: %s: not last packet\n", __func__);

                if (MP_RX_AGGR_IN_PROGRESS(card)) {
                        if (MP_RX_AGGR_BUF_HAS_ROOM(card, rx_len)) {
                                f_aggr_cur = 1;
                        } else {
                                /* No room in Aggr buf, do rx aggr now */
                                f_do_rx_aggr = 1;
                                f_post_aggr_cur = 1;
                        }
                } else {
                        /* Rx aggr not in progress */
                        f_aggr_cur = 1;
                }

        } else {
                /* No more data RX pending */
                mwifiex_dbg(adapter, INFO,
                            "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, rx_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) {
                mwifiex_dbg(adapter, INFO,
                            "info: current packet aggregation\n");
                /* Curr pkt can be aggregated */
                mp_rx_aggr_setup(card, rx_len, port);

                if (MP_RX_AGGR_PKT_LIMIT_REACHED(card) ||
                    mp_rx_aggr_port_limit_reached(card)) {
                        mwifiex_dbg(adapter, INFO,
                                    "info: %s: aggregated packet\t"
                                    "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 */
                mwifiex_dbg(adapter, DATA,
                            "info: do_rx_aggr: num of packets: %d\n",
                            card->mpa_rx.pkt_cnt);

                if (card->supports_sdio_new_mode) {
                        int i;
                        u32 port_count;

                        for (i = 0, port_count = 0; i < card->max_ports; i++)
                                if (card->mpa_rx.ports & BIT(i))
                                        port_count++;

                        /* Reading data from "start_port + 0" to "start_port +
                         * port_count -1", so decrease the count by 1
                         */
                        port_count--;
                        mport = (adapter->ioport | SDIO_MPA_ADDR_BASE |
                                 (port_count << 8)) + card->mpa_rx.start_port;
                } else {
                        mport = (adapter->ioport | SDIO_MPA_ADDR_BASE |
                                 (card->mpa_rx.ports << 4)) +
                                 card->mpa_rx.start_port;
                }

                if (card->mpa_rx.pkt_cnt == 1)
                        mport = adapter->ioport + port;

                if (mwifiex_read_data_sync(adapter, card->mpa_rx.buf,
                                           card->mpa_rx.buf_len, mport, 1))
                        goto error;

                curr_ptr = card->mpa_rx.buf;

                for (pind = 0; pind < card->mpa_rx.pkt_cnt; pind++) {
                        u32 *len_arr = card->mpa_rx.len_arr;

                        /* get curr PKT len & type */
                        pkt_len = le16_to_cpu(*(__le16 *) &curr_ptr[0]);
                        pkt_type = le16_to_cpu(*(__le16 *) &curr_ptr[2]);

                        /* copy pkt to deaggr buf */
                        skb_deaggr = mwifiex_alloc_dma_align_buf(len_arr[pind],
                                                                 GFP_KERNEL);
                        if (!skb_deaggr) {
                                mwifiex_dbg(adapter, ERROR, "skb allocation failure\t"
                                            "drop pkt len=%d type=%d\n",
                                            pkt_len, pkt_type);
                                curr_ptr += len_arr[pind];
                                continue;
                        }

                        skb_put(skb_deaggr, len_arr[pind]);

                        if ((pkt_type == MWIFIEX_TYPE_DATA ||
                             (pkt_type == MWIFIEX_TYPE_AGGR_DATA &&
                              adapter->sdio_rx_aggr_enable)) &&
                            (pkt_len <= 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 {
                                mwifiex_dbg(adapter, ERROR,
                                            "drop wrong aggr pkt:\t"
                                            "sdio_single_port_rx_aggr=%d\t"
                                            "type=%d len=%d max_len=%d\n",
                                            adapter->sdio_rx_aggr_enable,
                                            pkt_type, pkt_len, len_arr[pind]);
                                dev_kfree_skb_any(skb_deaggr);
                        }
                        curr_ptr += len_arr[pind];
                }
                MP_RX_AGGR_BUF_RESET(card);
        }

rx_curr_single:
        if (f_do_rx_cur) {
                mwifiex_dbg(adapter, INFO, "info: RX: port: %d, rx_len: %d\n",
                            port, rx_len);

                skb = mwifiex_alloc_dma_align_buf(rx_len, GFP_KERNEL);
                if (!skb) {
                        mwifiex_dbg(adapter, ERROR,
                                    "single skb allocated fail,\t"
                                    "drop pkt port=%d len=%d\n", port, rx_len);
                        if (mwifiex_sdio_card_to_host(adapter, &pkt_type,
                                                      card->mpa_rx.buf, rx_len,
                                                      adapter->ioport + port))
                                goto error;
                        return 0;
                }

                skb_put(skb, rx_len);

                if (mwifiex_sdio_card_to_host(adapter, &pkt_type,
                                              skb->data, skb->len,
                                              adapter->ioport + port))
                        goto error;
                if (!adapter->sdio_rx_aggr_enable &&
                    pkt_type == MWIFIEX_TYPE_AGGR_DATA) {
                        mwifiex_dbg(adapter, ERROR, "drop wrong pkt type %d\t"
                                    "current SDIO RX Aggr not enabled\n",
                                    pkt_type);
                        dev_kfree_skb_any(skb);
                        return 0;
                }

                mwifiex_decode_rx_packet(adapter, skb, pkt_type);
        }
        if (f_post_aggr_cur) {
                mwifiex_dbg(adapter, INFO,
                            "info: current packet aggregation\n");
                /* Curr pkt can be aggregated */
                mp_rx_aggr_setup(card, rx_len, port);
        }

        return 0;
error:
        if (MP_RX_AGGR_IN_PROGRESS(card))
                MP_RX_AGGR_BUF_RESET(card);

        if (f_do_rx_cur && skb)
                /* Single transfer pending. Free curr buff also */
                dev_kfree_skb_any(skb);

        return -1;
}

/*
 * 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;
        const struct mwifiex_sdio_card_reg *reg = card->reg;
        int ret = 0;
        u8 sdio_ireg;
        struct sk_buff *skb;
        u8 port = CTRL_PORT;
        u32 len_reg_l, len_reg_u;
        u32 rx_blocks;
        u16 rx_len;
        unsigned long flags;
        u32 bitmap;
        u8 cr;

        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;

        /* Following interrupt is only for SDIO new mode */
        if (sdio_ireg & DN_LD_CMD_PORT_HOST_INT_STATUS && adapter->cmd_sent)
                adapter->cmd_sent = false;

        /* Following interrupt is only for SDIO new mode */
        if (sdio_ireg & UP_LD_CMD_PORT_HOST_INT_STATUS) {
                u32 pkt_type;

                /* read the len of control packet */
                rx_len = card->mp_regs[reg->cmd_rd_len_1] << 8;
                rx_len |= (u16)card->mp_regs[reg->cmd_rd_len_0];
                rx_blocks = DIV_ROUND_UP(rx_len, MWIFIEX_SDIO_BLOCK_SIZE);
                if (rx_len <= INTF_HEADER_LEN ||
                    (rx_blocks * MWIFIEX_SDIO_BLOCK_SIZE) >
                     MWIFIEX_RX_DATA_BUF_SIZE)
                        return -1;
                rx_len = (u16) (rx_blocks * MWIFIEX_SDIO_BLOCK_SIZE);
                mwifiex_dbg(adapter, INFO, "info: rx_len = %d\n", rx_len);

                skb = mwifiex_alloc_dma_align_buf(rx_len, GFP_KERNEL);
                if (!skb)
                        return -1;

                skb_put(skb, rx_len);

                if (mwifiex_sdio_card_to_host(adapter, &pkt_type, skb->data,
                                              skb->len, adapter->ioport |
                                                        CMD_PORT_SLCT)) {
                        mwifiex_dbg(adapter, ERROR,
                                    "%s: failed to card_to_host", __func__);
                        dev_kfree_skb_any(skb);
                        goto term_cmd;
                }

                if ((pkt_type != MWIFIEX_TYPE_CMD) &&
                    (pkt_type != MWIFIEX_TYPE_EVENT))
                        mwifiex_dbg(adapter, ERROR,
                                    "%s:Received wrong packet on cmd port",
                                    __func__);

                mwifiex_decode_rx_packet(adapter, skb, pkt_type);
        }

        if (sdio_ireg & DN_LD_HOST_INT_STATUS) {
                bitmap = (u32) card->mp_regs[reg->wr_bitmap_l];
                bitmap |= ((u32) card->mp_regs[reg->wr_bitmap_u]) << 8;
                if (card->supports_sdio_new_mode) {
                        bitmap |=
                                ((u32) card->mp_regs[reg->wr_bitmap_1l]) << 16;
                        bitmap |=
                                ((u32) card->mp_regs[reg->wr_bitmap_1u]) << 24;
                }
                card->mp_wr_bitmap = bitmap;

                mwifiex_dbg(adapter, INTR,
                            "int: DNLD: wr_bitmap=0x%x\n",
                            card->mp_wr_bitmap);
                if (adapter->data_sent &&
                    (card->mp_wr_bitmap & card->mp_data_port_mask)) {
                        mwifiex_dbg(adapter, INTR,
                                    "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 (card->has_control_mask && adapter->cmd_sent) {
                /* Check if firmware has attach buffer at command port and
                   update just that in wr_bit_map. */
                card->mp_wr_bitmap |=
                        (u32) card->mp_regs[reg->wr_bitmap_l] & CTRL_PORT_MASK;
                if (card->mp_wr_bitmap & CTRL_PORT_MASK)
                        adapter->cmd_sent = false;
        }

        mwifiex_dbg(adapter, INTR, "info: cmd_sent=%d data_sent=%d\n",
                    adapter->cmd_sent, adapter->data_sent);
        if (sdio_ireg & UP_LD_HOST_INT_STATUS) {
                bitmap = (u32) card->mp_regs[reg->rd_bitmap_l];
                bitmap |= ((u32) card->mp_regs[reg->rd_bitmap_u]) << 8;
                if (card->supports_sdio_new_mode) {
                        bitmap |=
                                ((u32) card->mp_regs[reg->rd_bitmap_1l]) << 16;
                        bitmap |=
                                ((u32) card->mp_regs[reg->rd_bitmap_1u]) << 24;
                }
                card->mp_rd_bitmap = bitmap;
                mwifiex_dbg(adapter, INTR,
                            "int: UPLD: rd_bitmap=0x%x\n",
                            card->mp_rd_bitmap);

                while (true) {
                        ret = mwifiex_get_rd_port(adapter, &port);
                        if (ret) {
                                mwifiex_dbg(adapter, INFO,
                                            "info: no more rd_port available\n");
                                break;
                        }
                        len_reg_l = reg->rd_len_p0_l + (port << 1);
                        len_reg_u = reg->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];
                        mwifiex_dbg(adapter, INFO,
                                    "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 ||
                            (card->mpa_rx.enabled &&
                             ((rx_blocks * MWIFIEX_SDIO_BLOCK_SIZE) >
                              card->mpa_rx.buf_size))) {
                                mwifiex_dbg(adapter, ERROR,
                                            "invalid rx_len=%d\n",
                                            rx_len);
                                return -1;
                        }

                        rx_len = (u16) (rx_blocks * MWIFIEX_SDIO_BLOCK_SIZE);
                        mwifiex_dbg(adapter, INFO, "info: rx_len = %d\n",
                                    rx_len);

                        if (mwifiex_sdio_card_to_host_mp_aggr(adapter, rx_len,
                                                              port)) {
                                mwifiex_dbg(adapter, ERROR,
                                            "card_to_host_mpa failed: int status=%#x\n",
                                            sdio_ireg);
                                goto term_cmd;
                        }
                }
        }

        return 0;

term_cmd:
        /* terminate cmd */
        if (mwifiex_read_reg(adapter, CONFIGURATION_REG, &cr))
                mwifiex_dbg(adapter, ERROR, "read CFG reg failed\n");
        else
                mwifiex_dbg(adapter, INFO,
                            "info: CFG reg val = %d\n", cr);

        if (mwifiex_write_reg(adapter, CONFIGURATION_REG, (cr | 0x04)))
                mwifiex_dbg(adapter, ERROR,
                            "write CFG reg failed\n");
        else
                mwifiex_dbg(adapter, INFO, "info: write success\n");

        if (mwifiex_read_reg(adapter, CONFIGURATION_REG, &cr))
                mwifiex_dbg(adapter, ERROR,
                            "read CFG reg failed\n");
        else
                mwifiex_dbg(adapter, INFO,
                            "info: CFG reg val =%x\n", cr);

        return -1;
}

/*
 * 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, u32 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;
        u32 mport;
        int index;

        if (!card->mpa_tx.enabled ||
            (card->has_control_mask && (port == CTRL_PORT)) ||
            (card->supports_sdio_new_mode && (port == CMD_PORT_SLCT))) {
                mwifiex_dbg(adapter, WARN,
                            "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 */
                mwifiex_dbg(adapter, INFO,
                            "info: %s: more packets in queue.\n",
                            __func__);

                if (MP_TX_AGGR_IN_PROGRESS(card)) {
                        if (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, pkt_len + next_pkt_len))
                                        f_send_aggr_buf = 1;
                        } else {
                                /* No room in Aggr buf, send it */
                                f_send_aggr_buf = 1;

                                if (!(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 */
                mwifiex_dbg(adapter, INFO,
                            "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) {
                mwifiex_dbg(adapter, DATA,
                            "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) {
                mwifiex_dbg(adapter, DATA,
                            "data: %s: send aggr buffer: %d %d\n",
                            __func__, card->mpa_tx.start_port,
                            card->mpa_tx.ports);
                if (card->supports_sdio_new_mode) {
                        u32 port_count;
                        int i;

                        for (i = 0, port_count = 0; i < card->max_ports; i++)
                                if (card->mpa_tx.ports & BIT(i))
                                        port_count++;

                        /* Writing data from "start_port + 0" to "start_port +
                         * port_count -1", so decrease the count by 1
                         */
                        port_count--;
                        mport = (adapter->ioport | SDIO_MPA_ADDR_BASE |
                                 (port_count << 8)) + card->mpa_tx.start_port;
                } else {
                        mport = (adapter->ioport | SDIO_MPA_ADDR_BASE |
                                 (card->mpa_tx.ports << 4)) +
                                 card->mpa_tx.start_port;
                }

                if (card->mpa_tx.pkt_cnt == 1)
                        mport = adapter->ioport + port;

                ret = mwifiex_write_data_to_card(adapter, card->mpa_tx.buf,
                                                 card->mpa_tx.buf_len, mport);

                /* Save the last multi port tx aggreagation info to debug log */
                index = adapter->dbg.last_sdio_mp_index;
                index = (index + 1) % MWIFIEX_DBG_SDIO_MP_NUM;
                adapter->dbg.last_sdio_mp_index = index;
                adapter->dbg.last_mp_wr_ports[index] = mport;
                adapter->dbg.last_mp_wr_bitmap[index] = card->mp_wr_bitmap;
                adapter->dbg.last_mp_wr_len[index] = card->mpa_tx.buf_len;
                adapter->dbg.last_mp_curr_wr_port[index] = card->curr_wr_port;

                MP_TX_AGGR_BUF_RESET(card);
        }

tx_curr_single:
        if (f_send_cur_buf) {
                mwifiex_dbg(adapter, DATA,
                            "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) {
                mwifiex_dbg(adapter, DATA,
                            "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, struct sk_buff *skb,
                                     struct mwifiex_tx_param *tx_param)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret;
        u32 buf_block_len;
        u32 blk_size;
        u32 port = CTRL_PORT;
        u8 *payload = (u8 *)skb->data;
        u32 pkt_len = skb->len;

        /* Allocate buffer and copy payload */
        blk_size = MWIFIEX_SDIO_BLOCK_SIZE;
        buf_block_len = (pkt_len + blk_size - 1) / blk_size;
        *(__le16 *)&payload[0] = cpu_to_le16((u16)pkt_len);
        *(__le16 *)&payload[2] = cpu_to_le16(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) {
                        mwifiex_dbg(adapter, ERROR,
                                    "%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)
                        mwifiex_dbg(adapter, ERROR,
                                    "%s: payload=%p, nb=%d\n",
                                    __func__, payload, pkt_len);

                if (card->supports_sdio_new_mode)
                        port = CMD_PORT_SLCT;
        }

        /* 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;
                        /* restore curr_wr_port in error cases */
                        card->curr_wr_port = port;
                        card->mp_wr_bitmap |= (u32)(1 << card->curr_wr_port);
                }
        } 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;
        u32 rx_buf_size;
        int ret = 0;

        card->mpa_tx.buf = kzalloc(mpa_tx_buf_size, GFP_KERNEL);
        if (!card->mpa_tx.buf) {
                ret = -1;
                goto error;
        }

        card->mpa_tx.buf_size = mpa_tx_buf_size;

        rx_buf_size = max_t(u32, mpa_rx_buf_size,
                            (u32)SDIO_MAX_AGGR_BUF_SIZE);
        card->mpa_rx.buf = kzalloc(rx_buf_size, GFP_KERNEL);
        if (!card->mpa_rx.buf) {
                ret = -1;
                goto error;
        }

        card->mpa_rx.buf_size = rx_buf_size;

error:
        if (ret) {
                kfree(card->mpa_tx.buf);
                kfree(card->mpa_rx.buf);
                card->mpa_tx.buf_size = 0;
                card->mpa_rx.buf_size = 0;
        }

        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) {
                sdio_claim_host(card->func);
                sdio_disable_func(card->func);
                sdio_release_host(card->func);
        }
}

/*
 * 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;
        struct sdio_mmc_card *card = adapter->card;
        struct sdio_func *func = card->func;

        /* save adapter pointer in card */
        card->adapter = adapter;
        adapter->tx_buf_size = card->tx_buf_size;

        sdio_claim_host(func);

        /* Set block size */
        ret = sdio_set_block_size(card->func, MWIFIEX_SDIO_BLOCK_SIZE);
        sdio_release_host(func);
        if (ret) {
                mwifiex_dbg(adapter, ERROR,
                            "cannot set SDIO block size\n");
                return ret;
        }


        adapter->dev = &func->dev;

        strcpy(adapter->fw_name, card->firmware);
        if (card->fw_dump_enh) {
                adapter->mem_type_mapping_tbl = generic_mem_type_map;
                adapter->num_mem_types = 1;
        } else {
                adapter->mem_type_mapping_tbl = mem_type_mapping_tbl;
                adapter->num_mem_types = ARRAY_SIZE(mem_type_mapping_tbl);
        }

        return 0;
}

/*
 * 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
 *      - 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;
        const struct mwifiex_sdio_card_reg *reg = card->reg;
        int ret;
        u8 sdio_ireg;

        sdio_set_drvdata(card->func, card);

        /*
         * 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, card->reg->host_int_status_reg, &sdio_ireg);

        /* Get SDIO ioport */
        mwifiex_init_sdio_ioport(adapter);

        /* Initialize SDIO variables in card */
        card->mp_rd_bitmap = 0;
        card->mp_wr_bitmap = 0;
        card->curr_rd_port = reg->start_rd_port;
        card->curr_wr_port = reg->start_wr_port;

        card->mp_data_port_mask = reg->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 = 1;
        card->mpa_tx.pkt_aggr_limit = card->mp_agg_pkt_limit;

        card->mpa_rx.buf_len = 0;
        card->mpa_rx.pkt_cnt = 0;
        card->mpa_rx.start_port = 0;

        card->mpa_rx.enabled = 1;
        card->mpa_rx.pkt_aggr_limit = card->mp_agg_pkt_limit;

        /* Allocate buffers for SDIO MP-A */
        card->mp_regs = kzalloc(reg->max_mp_regs, GFP_KERNEL);
        if (!card->mp_regs)
                return -ENOMEM;

        /* Allocate skb pointer buffers */
        card->mpa_rx.skb_arr = kzalloc((sizeof(void *)) *
                                       card->mp_agg_pkt_limit, GFP_KERNEL);
        if (!card->mpa_rx.skb_arr) {
                kfree(card->mp_regs);
                return -ENOMEM;
        }

        card->mpa_rx.len_arr = kzalloc(sizeof(*card->mpa_rx.len_arr) *
                                       card->mp_agg_pkt_limit, GFP_KERNEL);
        if (!card->mpa_rx.len_arr) {
                kfree(card->mp_regs);
                kfree(card->mpa_rx.skb_arr);
                return -ENOMEM;
        }

        ret = mwifiex_alloc_sdio_mpa_buffers(adapter,
                                             card->mp_tx_agg_buf_size,
                                             card->mp_rx_agg_buf_size);

        /* Allocate 32k MPA Tx/Rx buffers if 64k memory allocation fails */
        if (ret && (card->mp_tx_agg_buf_size == MWIFIEX_MP_AGGR_BUF_SIZE_MAX ||
                    card->mp_rx_agg_buf_size == MWIFIEX_MP_AGGR_BUF_SIZE_MAX)) {
                /* Disable rx single port aggregation */
                adapter->host_disable_sdio_rx_aggr = true;

                ret = mwifiex_alloc_sdio_mpa_buffers
                        (adapter, MWIFIEX_MP_AGGR_BUF_SIZE_32K,
                         MWIFIEX_MP_AGGR_BUF_SIZE_32K);
                if (ret) {
                        /* Disable multi port aggregation */
                        card->mpa_tx.enabled = 0;
                        card->mpa_rx.enabled = 0;
                }
        }

        adapter->auto_tdls = card->can_auto_tdls;
        adapter->ext_scan = card->can_ext_scan;
        return 0;
}

/*
 * 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_rx.skb_arr);
        kfree(card->mpa_rx.len_arr);
        kfree(card->mpa_tx.buf);
        kfree(card->mpa_rx.buf);
        sdio_set_drvdata(card->func, NULL);
        kfree(card);
}

/*
 * 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;
        const struct mwifiex_sdio_card_reg *reg = card->reg;
        int i;

        card->mp_end_port = port;

        card->mp_data_port_mask = reg->data_port_mask;

        if (reg->start_wr_port) {
                for (i = 1; i <= card->max_ports - card->mp_end_port; i++)
                        card->mp_data_port_mask &=
                                        ~(1 << (card->max_ports - i));
        }

        card->curr_wr_port = reg->start_wr_port;

        mwifiex_dbg(adapter, CMD,
                    "cmd: mp_end_port %d, data port mask 0x%x\n",
                    port, card->mp_data_port_mask);
}

static void mwifiex_recreate_adapter(struct sdio_mmc_card *card)
{
        struct sdio_func *func = card->func;
        const struct sdio_device_id *device_id = card->device_id;

        /* TODO mmc_hw_reset does not require destroying and re-probing the
         * whole adapter. Hence there was no need to for this rube-goldberg
         * design to reload the fw from an external workqueue. If we don't
         * destroy the adapter we could reload the fw from
         * mwifiex_main_work_queue directly.
         * The real difficulty with fw reset is to restore all the user
         * settings applied through ioctl. By destroying and recreating the
         * adapter, we take the easy way out, since we rely on user space to
         * restore them. We assume that user space will treat the new
         * incarnation of the adapter(interfaces) as if they had been just
         * discovered and initializes them from scratch.
         */

        mwifiex_sdio_remove(func);

        /* power cycle the adapter */
        sdio_claim_host(func);
        mmc_hw_reset(func->card->host);
        sdio_release_host(func);

        mwifiex_sdio_probe(func, device_id);
}

static struct mwifiex_adapter *save_adapter;
static void mwifiex_sdio_card_reset_work(struct mwifiex_adapter *adapter)
{
        struct sdio_mmc_card *card = adapter->card;

        /* TODO card pointer is unprotected. If the adapter is removed
         * physically, sdio core might trigger mwifiex_sdio_remove, before this
         * workqueue is run, which will destroy the adapter struct. When this
         * workqueue eventually exceutes it will dereference an invalid adapter
         * pointer
         */
        mwifiex_recreate_adapter(card);
}

/* This function read/write firmware */
static enum
rdwr_status mwifiex_sdio_rdwr_firmware(struct mwifiex_adapter *adapter,
                                       u8 doneflag)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret, tries;
        u8 ctrl_data = 0;

        sdio_writeb(card->func, card->reg->fw_dump_host_ready,
                    card->reg->fw_dump_ctrl, &ret);
        if (ret) {
                mwifiex_dbg(adapter, ERROR, "SDIO Write ERR\n");
                return RDWR_STATUS_FAILURE;
        }
        for (tries = 0; tries < MAX_POLL_TRIES; tries++) {
                ctrl_data = sdio_readb(card->func, card->reg->fw_dump_ctrl,
                                       &ret);
                if (ret) {
                        mwifiex_dbg(adapter, ERROR, "SDIO read err\n");
                        return RDWR_STATUS_FAILURE;
                }
                if (ctrl_data == FW_DUMP_DONE)
                        break;
                if (doneflag && ctrl_data == doneflag)
                        return RDWR_STATUS_DONE;
                if (ctrl_data != card->reg->fw_dump_host_ready) {
                        mwifiex_dbg(adapter, WARN,
                                    "The ctrl reg was changed, re-try again\n");
                        sdio_writeb(card->func, card->reg->fw_dump_host_ready,
                                    card->reg->fw_dump_ctrl, &ret);
                        if (ret) {
                                mwifiex_dbg(adapter, ERROR, "SDIO write err\n");
                                return RDWR_STATUS_FAILURE;
                        }
                }
                usleep_range(100, 200);
        }
        if (ctrl_data == card->reg->fw_dump_host_ready) {
                mwifiex_dbg(adapter, ERROR,
                            "Fail to pull ctrl_data\n");
                return RDWR_STATUS_FAILURE;
        }

        return RDWR_STATUS_SUCCESS;
}

/* This function dump firmware memory to file */
static void mwifiex_sdio_fw_dump(struct mwifiex_adapter *adapter)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret = 0;
        unsigned int reg, reg_start, reg_end;
        u8 *dbg_ptr, *end_ptr, dump_num, idx, i, read_reg, doneflag = 0;
        enum rdwr_status stat;
        u32 memory_size;

        if (!card->can_dump_fw)
                return;

        for (idx = 0; idx < ARRAY_SIZE(mem_type_mapping_tbl); idx++) {
                struct memory_type_mapping *entry = &mem_type_mapping_tbl[idx];

                if (entry->mem_ptr) {
                        vfree(entry->mem_ptr);
                        entry->mem_ptr = NULL;
                }
                entry->mem_size = 0;
        }

        mwifiex_pm_wakeup_card(adapter);
        sdio_claim_host(card->func);

        mwifiex_dbg(adapter, MSG, "== mwifiex firmware dump start ==\n");

        stat = mwifiex_sdio_rdwr_firmware(adapter, doneflag);
        if (stat == RDWR_STATUS_FAILURE)
                goto done;

        reg = card->reg->fw_dump_start;
        /* Read the number of the memories which will dump */
        dump_num = sdio_readb(card->func, reg, &ret);
        if (ret) {
                mwifiex_dbg(adapter, ERROR, "SDIO read memory length err\n");
                goto done;
        }

        /* Read the length of every memory which will dump */
        for (idx = 0; idx < dump_num; idx++) {
                struct memory_type_mapping *entry = &mem_type_mapping_tbl[idx];

                stat = mwifiex_sdio_rdwr_firmware(adapter, doneflag);
                if (stat == RDWR_STATUS_FAILURE)
                        goto done;

                memory_size = 0;
                reg = card->reg->fw_dump_start;
                for (i = 0; i < 4; i++) {
                        read_reg = sdio_readb(card->func, reg, &ret);
                        if (ret) {
                                mwifiex_dbg(adapter, ERROR, "SDIO read err\n");
                                goto done;
                        }
                        memory_size |= (read_reg << i*8);
                        reg++;
                }

                if (memory_size == 0) {
                        mwifiex_dbg(adapter, DUMP, "Firmware dump Finished!\n");
                        ret = mwifiex_write_reg(adapter,
                                                card->reg->fw_dump_ctrl,
                                                FW_DUMP_READ_DONE);
                        if (ret) {
                                mwifiex_dbg(adapter, ERROR, "SDIO write err\n");
                                return;
                        }
                        break;
                }

                mwifiex_dbg(adapter, DUMP,
                            "%s_SIZE=0x%x\n", entry->mem_name, memory_size);
                entry->mem_ptr = vmalloc(memory_size + 1);
                entry->mem_size = memory_size;
                if (!entry->mem_ptr) {
                        mwifiex_dbg(adapter, ERROR, "Vmalloc %s failed\n",
                                    entry->mem_name);
                        goto done;
                }
                dbg_ptr = entry->mem_ptr;
                end_ptr = dbg_ptr + memory_size;

                doneflag = entry->done_flag;
                mwifiex_dbg(adapter, DUMP,
                            "Start %s output, please wait...\n",
                            entry->mem_name);

                do {
                        stat = mwifiex_sdio_rdwr_firmware(adapter, doneflag);
                        if (stat == RDWR_STATUS_FAILURE)
                                goto done;

                        reg_start = card->reg->fw_dump_start;
                        reg_end = card->reg->fw_dump_end;
                        for (reg = reg_start; reg <= reg_end; reg++) {
                                *dbg_ptr = sdio_readb(card->func, reg, &ret);
                                if (ret) {
                                        mwifiex_dbg(adapter, ERROR,
                                                    "SDIO read err\n");
                                        goto done;
                                }
                                if (dbg_ptr < end_ptr)
                                        dbg_ptr++;
                                else
                                        mwifiex_dbg(adapter, ERROR,
                                                    "Allocated buf not enough\n");
                        }

                        if (stat != RDWR_STATUS_DONE)
                                continue;

                        mwifiex_dbg(adapter, DUMP, "%s done: size=0x%tx\n",
                                    entry->mem_name, dbg_ptr - entry->mem_ptr);
                        break;
                } while (1);
        }
        mwifiex_dbg(adapter, MSG, "== mwifiex firmware dump end ==\n");

done:
        sdio_release_host(card->func);
}

static void mwifiex_sdio_generic_fw_dump(struct mwifiex_adapter *adapter)
{
        struct sdio_mmc_card *card = adapter->card;
        struct memory_type_mapping *entry = &generic_mem_type_map[0];
        unsigned int reg, reg_start, reg_end;
        u8 start_flag = 0, done_flag = 0;
        u8 *dbg_ptr, *end_ptr;
        enum rdwr_status stat;
        int ret = -1, tries;

        if (!card->fw_dump_enh)
                return;

        if (entry->mem_ptr) {
                vfree(entry->mem_ptr);
                entry->mem_ptr = NULL;
        }
        entry->mem_size = 0;

        mwifiex_pm_wakeup_card(adapter);
        sdio_claim_host(card->func);

        mwifiex_dbg(adapter, MSG, "== mwifiex firmware dump start ==\n");

        stat = mwifiex_sdio_rdwr_firmware(adapter, done_flag);
        if (stat == RDWR_STATUS_FAILURE)
                goto done;

        reg_start = card->reg->fw_dump_start;
        reg_end = card->reg->fw_dump_end;
        for (reg = reg_start; reg <= reg_end; reg++) {
                for (tries = 0; tries < MAX_POLL_TRIES; tries++) {
                        start_flag = sdio_readb(card->func, reg, &ret);
                        if (ret) {
                                mwifiex_dbg(adapter, ERROR,
                                            "SDIO read err\n");
                                goto done;
                        }
                        if (start_flag == 0)
                                break;
                        if (tries == MAX_POLL_TRIES) {
                                mwifiex_dbg(adapter, ERROR,
                                            "FW not ready to dump\n");
                                ret = -1;
                                goto done;
                        }
                }
                usleep_range(100, 200);
        }

        entry->mem_ptr = vmalloc(0xf0000 + 1);
        if (!entry->mem_ptr) {
                ret = -1;
                goto done;
        }
        dbg_ptr = entry->mem_ptr;
        entry->mem_size = 0xf0000;
        end_ptr = dbg_ptr + entry->mem_size;

        done_flag = entry->done_flag;
        mwifiex_dbg(adapter, DUMP,
                    "Start %s output, please wait...\n", entry->mem_name);

        while (true) {
                stat = mwifiex_sdio_rdwr_firmware(adapter, done_flag);
                if (stat == RDWR_STATUS_FAILURE)
                        goto done;
                for (reg = reg_start; reg <= reg_end; reg++) {
                        *dbg_ptr = sdio_readb(card->func, reg, &ret);
                        if (ret) {
                                mwifiex_dbg(adapter, ERROR,
                                            "SDIO read err\n");
                                goto done;
                        }
                        dbg_ptr++;
                        if (dbg_ptr >= end_ptr) {
                                u8 *tmp_ptr;

                                tmp_ptr = vmalloc(entry->mem_size + 0x4000 + 1);
                                if (!tmp_ptr)
                                        goto done;

                                memcpy(tmp_ptr, entry->mem_ptr,
                                       entry->mem_size);
                                vfree(entry->mem_ptr);
                                entry->mem_ptr = tmp_ptr;
                                tmp_ptr = NULL;
                                dbg_ptr = entry->mem_ptr + entry->mem_size;
                                entry->mem_size += 0x4000;
                                end_ptr = entry->mem_ptr + entry->mem_size;
                        }
                }
                if (stat == RDWR_STATUS_DONE) {
                        entry->mem_size = dbg_ptr - entry->mem_ptr;
                        mwifiex_dbg(adapter, DUMP, "dump %s done size=0x%x\n",
                                    entry->mem_name, entry->mem_size);
                        ret = 0;
                        break;
                }
        }
        mwifiex_dbg(adapter, MSG, "== mwifiex firmware dump end ==\n");

done:
        if (ret) {
                mwifiex_dbg(adapter, ERROR, "firmware dump failed\n");
                if (entry->mem_ptr) {
                        vfree(entry->mem_ptr);
                        entry->mem_ptr = NULL;
                }
                entry->mem_size = 0;
        }
        sdio_release_host(card->func);
}

static void mwifiex_sdio_device_dump_work(struct mwifiex_adapter *adapter)
{
        struct sdio_mmc_card *card = adapter->card;

        mwifiex_drv_info_dump(adapter);
        if (card->fw_dump_enh)
                mwifiex_sdio_generic_fw_dump(adapter);
        else
                mwifiex_sdio_fw_dump(adapter);
        mwifiex_upload_device_dump(adapter);
}

static void mwifiex_sdio_work(struct work_struct *work)
{
        if (test_and_clear_bit(MWIFIEX_IFACE_WORK_DEVICE_DUMP,
                               &iface_work_flags))
                mwifiex_sdio_device_dump_work(save_adapter);
        if (test_and_clear_bit(MWIFIEX_IFACE_WORK_CARD_RESET,
                               &iface_work_flags))
                mwifiex_sdio_card_reset_work(save_adapter);
}

static DECLARE_WORK(sdio_work, mwifiex_sdio_work);
/* This function resets the card */
static void mwifiex_sdio_card_reset(struct mwifiex_adapter *adapter)
{
        save_adapter = adapter;
        if (test_bit(MWIFIEX_IFACE_WORK_CARD_RESET, &iface_work_flags))
                return;

        set_bit(MWIFIEX_IFACE_WORK_CARD_RESET, &iface_work_flags);

        schedule_work(&sdio_work);
}

/* This function dumps FW information */
static void mwifiex_sdio_device_dump(struct mwifiex_adapter *adapter)
{
        save_adapter = adapter;
        if (test_bit(MWIFIEX_IFACE_WORK_DEVICE_DUMP, &iface_work_flags))
                return;

        set_bit(MWIFIEX_IFACE_WORK_DEVICE_DUMP, &iface_work_flags);
        schedule_work(&sdio_work);
}

/* Function to dump SDIO function registers and SDIO scratch registers in case
 * of FW crash
 */
static int
mwifiex_sdio_reg_dump(struct mwifiex_adapter *adapter, char *drv_buf)
{
        char *p = drv_buf;
        struct sdio_mmc_card *cardp = adapter->card;
        int ret = 0;
        u8 count, func, data, index = 0, size = 0;
        u8 reg, reg_start, reg_end;
        char buf[256], *ptr;

        if (!p)
                return 0;

        mwifiex_dbg(adapter, MSG, "SDIO register dump start\n");

        mwifiex_pm_wakeup_card(adapter);

        sdio_claim_host(cardp->func);

        for (count = 0; count < 5; count++) {
                memset(buf, 0, sizeof(buf));
                ptr = buf;

                switch (count) {
                case 0:
                        /* Read the registers of SDIO function0 */
                        func = count;
                        reg_start = 0;
                        reg_end = 9;
                        break;
                case 1:
                        /* Read the registers of SDIO function1 */
                        func = count;
                        reg_start = cardp->reg->func1_dump_reg_start;
                        reg_end = cardp->reg->func1_dump_reg_end;
                        break;
                case 2:
                        index = 0;
                        func = 1;
                        reg_start = cardp->reg->func1_spec_reg_table[index++];
                        size = cardp->reg->func1_spec_reg_num;
                        reg_end = cardp->reg->func1_spec_reg_table[size-1];
                        break;
                default:
                        /* Read the scratch registers of SDIO function1 */
                        if (count == 4)
                                mdelay(100);
                        func = 1;
                        reg_start = cardp->reg->func1_scratch_reg;
                        reg_end = reg_start + MWIFIEX_SDIO_SCRATCH_SIZE;
                }

                if (count != 2)
                        ptr += sprintf(ptr, "SDIO Func%d (%#x-%#x): ",
                                       func, reg_start, reg_end);
                else
                        ptr += sprintf(ptr, "SDIO Func%d: ", func);

                for (reg = reg_start; reg <= reg_end;) {
                        if (func == 0)
                                data = sdio_f0_readb(cardp->func, reg, &ret);
                        else
                                data = sdio_readb(cardp->func, reg, &ret);

                        if (count == 2)
                                ptr += sprintf(ptr, "(%#x) ", reg);
                        if (!ret) {
                                ptr += sprintf(ptr, "%02x ", data);
                        } else {
                                ptr += sprintf(ptr, "ERR");
                                break;
                        }

                        if (count == 2 && reg < reg_end)
                                reg = cardp->reg->func1_spec_reg_table[index++];
                        else
                                reg++;
                }

                mwifiex_dbg(adapter, MSG, "%s\n", buf);
                p += sprintf(p, "%s\n", buf);
        }

        sdio_release_host(cardp->func);

        mwifiex_dbg(adapter, MSG, "SDIO register dump end\n");

        return p - drv_buf;
}

static struct mwifiex_if_ops sdio_ops = {
        .init_if = mwifiex_init_sdio,
        .cleanup_if = mwifiex_cleanup_sdio,
        .check_fw_status = mwifiex_check_fw_status,
        .check_winner_status = mwifiex_check_winner_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,
        .disable_int = mwifiex_sdio_disable_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,
        .cmdrsp_complete = mwifiex_sdio_cmdrsp_complete,
        .event_complete = mwifiex_sdio_event_complete,
        .dnld_fw = mwifiex_sdio_dnld_fw,
        .card_reset = mwifiex_sdio_card_reset,
        .reg_dump = mwifiex_sdio_reg_dump,
        .device_dump = mwifiex_sdio_device_dump,
        .deaggr_pkt = mwifiex_deaggr_sdio_pkt,
};

/*
 * This function initializes the SDIO driver.
 *
 * This initiates the semaphore and registers the device with
 * SDIO bus.
 */
static int
mwifiex_sdio_init_module(void)
{
        sema_init(&add_remove_card_sem, 1);

        /* Clear the flag in case user removes the card. */
        user_rmmod = 0;

        return sdio_register_driver(&mwifiex_sdio);
}

/*
 * 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)
{
        if (!down_interruptible(&add_remove_card_sem))
                up(&add_remove_card_sem);

        /* Set the flag as user is removing this module. */
        user_rmmod = 1;
        cancel_work_sync(&sdio_work);

        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(SD8786_DEFAULT_FW_NAME);
MODULE_FIRMWARE(SD8787_DEFAULT_FW_NAME);
MODULE_FIRMWARE(SD8797_DEFAULT_FW_NAME);
MODULE_FIRMWARE(SD8897_DEFAULT_FW_NAME);
MODULE_FIRMWARE(SD8887_DEFAULT_FW_NAME);
MODULE_FIRMWARE(SD8997_DEFAULT_FW_NAME);