Merge branch 'for-linus' of git://git.infradead.org/users/sameo/mfd-2.6

[linux-btrfs-devel.git] / drivers / net / wireless / mwifiex / sdio.c

/*
 * Marvell Wireless LAN device driver: SDIO specific handling
 *
 * Copyright (C) 2011, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include <linux/firmware.h>

#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"
#include "11n.h"
#include "sdio.h"


#define SDIO_VERSION    "1.0"

/* 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 struct semaphore add_remove_card_sem;

static int mwifiex_sdio_resume(struct device *dev);

/*
 * 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) {
                pr_err("%s: failed to alloc memory\n", __func__);
                return -ENOMEM;
        }

        card->func = func;

        func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;

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

        if (ret) {
                pr_err("%s: failed to enable function\n", __func__);
                kfree(card);
                return -EIO;
        }

        if (mwifiex_add_card(card, &add_remove_card_sem, &sdio_ops)) {
                pr_err("%s: add card failed\n", __func__);
                kfree(card);
                sdio_claim_host(func);
                ret = sdio_disable_func(func);
                sdio_release_host(func);
                ret = -1;
        }

        return ret;
}

/*
 * SDIO remove.
 *
 * This function removes the interface and frees up the card structure.
 */
static void
mwifiex_sdio_remove(struct sdio_func *func)
{
        struct sdio_mmc_card *card;
        struct mwifiex_adapter *adapter;
        int i;

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

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

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

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

                for (i = 0; i < adapter->priv_num; i++)
                        if ((GET_BSS_ROLE(adapter->priv[i]) ==
                                                MWIFIEX_BSS_ROLE_STA) &&
                                        adapter->priv[i]->media_connected)
                                mwifiex_deauthenticate(adapter->priv[i], NULL);

                mwifiex_disable_auto_ds(mwifiex_get_priv(adapter,
                                                         MWIFIEX_BSS_ROLE_ANY));

                mwifiex_init_shutdown_fw(mwifiex_get_priv(adapter,
                                                MWIFIEX_BSS_ROLE_ANY),
                                         MWIFIEX_FUNC_SHUTDOWN);
        }

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

/*
 * SDIO suspend.
 *
 * Kernel needs to suspend all functions separately. Therefore all
 * registered functions must have drivers with suspend and resume
 * methods. Failing that the kernel simply removes the whole card.
 *
 * If already not suspended, this function allocates and sends a host
 * sleep activate request to the firmware and turns off the traffic.
 */
static int mwifiex_sdio_suspend(struct device *dev)
{
        struct sdio_func *func = dev_to_sdio_func(dev);
        struct sdio_mmc_card *card;
        struct mwifiex_adapter *adapter;
        mmc_pm_flag_t pm_flag = 0;
        int hs_actived = 0;
        int i;
        int ret = 0;

        if (func) {
                pm_flag = sdio_get_host_pm_caps(func);
                pr_debug("cmd: %s: suspend: PM flag = 0x%x\n",
                       sdio_func_id(func), pm_flag);
                if (!(pm_flag & MMC_PM_KEEP_POWER)) {
                        pr_err("%s: cannot remain alive while host is"
                                " suspended\n", sdio_func_id(func));
                        return -ENOSYS;
                }

                card = sdio_get_drvdata(func);
                if (!card || !card->adapter) {
                        pr_err("suspend: invalid card or adapter\n");
                        return 0;
                }
        } else {
                pr_err("suspend: sdio_func is not specified\n");
                return 0;
        }

        adapter = card->adapter;

        /* Enable the Host Sleep */
        hs_actived = mwifiex_enable_hs(adapter);
        if (hs_actived) {
                pr_debug("cmd: suspend with MMC_PM_KEEP_POWER\n");
                ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
        }

        /* Indicate device suspended */
        adapter->is_suspended = true;

        for (i = 0; i < adapter->priv_num; i++)
                netif_carrier_off(adapter->priv[i]->netdev);

        return ret;
}

/*
 * SDIO resume.
 *
 * Kernel needs to suspend all functions separately. Therefore all
 * registered functions must have drivers with suspend and resume
 * methods. Failing that the kernel simply removes the whole card.
 *
 * If already not resumed, this function turns on the traffic and
 * sends a host sleep cancel request to the firmware.
 */
static int mwifiex_sdio_resume(struct device *dev)
{
        struct sdio_func *func = dev_to_sdio_func(dev);
        struct sdio_mmc_card *card;
        struct mwifiex_adapter *adapter;
        mmc_pm_flag_t pm_flag = 0;
        int i;

        if (func) {
                pm_flag = sdio_get_host_pm_caps(func);
                card = sdio_get_drvdata(func);
                if (!card || !card->adapter) {
                        pr_err("resume: invalid card or adapter\n");
                        return 0;
                }
        } else {
                pr_err("resume: sdio_func is not specified\n");
                return 0;
        }

        adapter = card->adapter;

        if (!adapter->is_suspended) {
                dev_warn(adapter->dev, "device already resumed\n");
                return 0;
        }

        adapter->is_suspended = false;

        for (i = 0; i < adapter->priv_num; i++)
                if (adapter->priv[i]->media_connected)
                        netif_carrier_on(adapter->priv[i]->netdev);

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

        return 0;
}

/* Device ID for SD8787 */
#define SDIO_DEVICE_ID_MARVELL_8787   (0x9119)

/* WLAN IDs */
static const struct sdio_device_id mwifiex_ids[] = {
        {SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8787)},
        {},
};

MODULE_DEVICE_TABLE(sdio, mwifiex_ids);

static const struct dev_pm_ops mwifiex_sdio_pm_ops = {
        .suspend = mwifiex_sdio_suspend,
        .resume = mwifiex_sdio_resume,
};

static struct sdio_driver mwifiex_sdio = {
        .name = "mwifiex_sdio",
        .id_table = mwifiex_ids,
        .probe = mwifiex_sdio_probe,
        .remove = mwifiex_sdio_remove,
        .drv = {
                .owner = THIS_MODULE,
                .pm = &mwifiex_sdio_pm_ops,
        }
};

/*
 * This function writes data into SDIO card register.
 */
static int
mwifiex_write_reg(struct mwifiex_adapter *adapter, u32 reg, u32 data)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret = -1;

        sdio_claim_host(card->func);
        sdio_writeb(card->func, (u8) data, reg, &ret);
        sdio_release_host(card->func);

        return ret;
}

/*
 * This function reads data from SDIO card register.
 */
static int
mwifiex_read_reg(struct mwifiex_adapter *adapter, u32 reg, u32 *data)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret = -1;
        u8 val;

        sdio_claim_host(card->func);
        val = sdio_readb(card->func, reg, &ret);
        sdio_release_host(card->func);

        *data = val;

        return ret;
}

/*
 * This function writes multiple data into SDIO card memory.
 *
 * This does not work in suspended mode.
 */
static int
mwifiex_write_data_sync(struct mwifiex_adapter *adapter,
                        u8 *buffer, u32 pkt_len, u32 port)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret = -1;
        u8 blk_mode =
                (port & MWIFIEX_SDIO_BYTE_MODE_MASK) ? BYTE_MODE : BLOCK_MODE;
        u32 blk_size = (blk_mode == BLOCK_MODE) ? MWIFIEX_SDIO_BLOCK_SIZE : 1;
        u32 blk_cnt =
                (blk_mode ==
                 BLOCK_MODE) ? (pkt_len /
                                MWIFIEX_SDIO_BLOCK_SIZE) : pkt_len;
        u32 ioport = (port & MWIFIEX_SDIO_IO_PORT_MASK);

        if (adapter->is_suspended) {
                dev_err(adapter->dev,
                        "%s: not allowed while suspended\n", __func__);
                return -1;
        }

        sdio_claim_host(card->func);

        if (!sdio_writesb(card->func, ioport, buffer, blk_cnt * blk_size))
                ret = 0;

        sdio_release_host(card->func);

        return ret;
}

/*
 * This function reads multiple data from SDIO card memory.
 */
static int mwifiex_read_data_sync(struct mwifiex_adapter *adapter, u8 *buffer,
                                  u32 len, u32 port, u8 claim)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret = -1;
        u8 blk_mode =
                (port & MWIFIEX_SDIO_BYTE_MODE_MASK) ? BYTE_MODE : BLOCK_MODE;
        u32 blk_size = (blk_mode == BLOCK_MODE) ? MWIFIEX_SDIO_BLOCK_SIZE : 1;
        u32 blk_cnt =
                (blk_mode ==
                 BLOCK_MODE) ? (len / MWIFIEX_SDIO_BLOCK_SIZE) : len;
        u32 ioport = (port & MWIFIEX_SDIO_IO_PORT_MASK);

        if (claim)
                sdio_claim_host(card->func);

        if (!sdio_readsb(card->func, buffer, ioport, blk_cnt * blk_size))
                ret = 0;

        if (claim)
                sdio_release_host(card->func);

        return ret;
}

/*
 * This function wakes up the card.
 *
 * A host power up command is written to the card configuration
 * register to wake up the card.
 */
static int mwifiex_pm_wakeup_card(struct mwifiex_adapter *adapter)
{
        dev_dbg(adapter->dev, "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)
{
        dev_dbg(adapter->dev, "cmd: wakeup device completed\n");

        return mwifiex_write_reg(adapter, CONFIGURATION_REG, 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)
{
        u32 reg;

        adapter->ioport = 0;

        /* Read the IO port */
        if (!mwifiex_read_reg(adapter, IO_PORT_0_REG, &reg))
                adapter->ioport |= (reg & 0xff);
        else
                return -1;

        if (!mwifiex_read_reg(adapter, IO_PORT_1_REG, &reg))
                adapter->ioport |= ((reg & 0xff) << 8);
        else
                return -1;

        if (!mwifiex_read_reg(adapter, IO_PORT_2_REG, &reg))
                adapter->ioport |= ((reg & 0xff) << 16);
        else
                return -1;

        pr_debug("info: SDIO FUNC1 IO port: %#x\n", adapter->ioport);

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

        /* Dnld/Upld ready set to auto reset */
        if (!mwifiex_read_reg(adapter, CARD_MISC_CFG_REG, &reg))
                mwifiex_write_reg(adapter, CARD_MISC_CFG_REG,
                                  reg | AUTO_RE_ENABLE_INT);
        else
                return -1;

        return 0;
}

/*
 * This function sends data to the card.
 */
static int mwifiex_write_data_to_card(struct mwifiex_adapter *adapter,
                                      u8 *payload, u32 pkt_len, u32 port)
{
        u32 i = 0;
        int ret;

        do {
                ret = mwifiex_write_data_sync(adapter, payload, pkt_len, port);
                if (ret) {
                        i++;
                        dev_err(adapter->dev, "host_to_card, write iomem"
                                        " (%d) failed: %d\n", i, ret);
                        if (mwifiex_write_reg(adapter,
                                        CONFIGURATION_REG, 0x04))
                                dev_err(adapter->dev, "write CFG reg failed\n");

                        ret = -1;
                        if (i > MAX_WRITE_IOMEM_RETRY)
                                return ret;
                }
        } while (ret == -1);

        return ret;
}

/*
 * This function gets the read port.
 *
 * If control port bit is set in MP read bitmap, the control port
 * is returned, otherwise the current read port is returned and
 * the value is increased (provided it does not reach the maximum
 * limit, in which case it is reset to 1)
 */
static int mwifiex_get_rd_port(struct mwifiex_adapter *adapter, u8 *port)
{
        struct sdio_mmc_card *card = adapter->card;
        u16 rd_bitmap = card->mp_rd_bitmap;

        dev_dbg(adapter->dev, "data: mp_rd_bitmap=0x%04x\n", rd_bitmap);

        if (!(rd_bitmap & (CTRL_PORT_MASK | DATA_PORT_MASK)))
                return -1;

        if (card->mp_rd_bitmap & CTRL_PORT_MASK) {
                card->mp_rd_bitmap &= (u16) (~CTRL_PORT_MASK);
                *port = CTRL_PORT;
                dev_dbg(adapter->dev, "data: port=%d mp_rd_bitmap=0x%04x\n",
                       *port, card->mp_rd_bitmap);
        } else {
                if (card->mp_rd_bitmap & (1 << card->curr_rd_port)) {
                        card->mp_rd_bitmap &=
                                (u16) (~(1 << card->curr_rd_port));
                        *port = card->curr_rd_port;

                        if (++card->curr_rd_port == MAX_PORT)
                                card->curr_rd_port = 1;
                } else {
                        return -1;
                }

                dev_dbg(adapter->dev,
                        "data: port=%d mp_rd_bitmap=0x%04x -> 0x%04x\n",
                       *port, rd_bitmap, card->mp_rd_bitmap);
        }
        return 0;
}

/*
 * This function gets the write port for data.
 *
 * The current write port is returned if available and the value is
 * increased (provided it does not reach the maximum limit, in which
 * case it is reset to 1)
 */
static int mwifiex_get_wr_port_data(struct mwifiex_adapter *adapter, u8 *port)
{
        struct sdio_mmc_card *card = adapter->card;
        u16 wr_bitmap = card->mp_wr_bitmap;

        dev_dbg(adapter->dev, "data: mp_wr_bitmap=0x%04x\n", wr_bitmap);

        if (!(wr_bitmap & card->mp_data_port_mask))
                return -1;

        if (card->mp_wr_bitmap & (1 << card->curr_wr_port)) {
                card->mp_wr_bitmap &= (u16) (~(1 << card->curr_wr_port));
                *port = card->curr_wr_port;
                if (++card->curr_wr_port == card->mp_end_port)
                        card->curr_wr_port = 1;
        } else {
                adapter->data_sent = true;
                return -EBUSY;
        }

        if (*port == CTRL_PORT) {
                dev_err(adapter->dev, "invalid data port=%d cur port=%d"
                                " mp_wr_bitmap=0x%04x -> 0x%04x\n",
                                *port, card->curr_wr_port, wr_bitmap,
                                card->mp_wr_bitmap);
                return -1;
        }

        dev_dbg(adapter->dev, "data: port=%d mp_wr_bitmap=0x%04x -> 0x%04x\n",
               *port, wr_bitmap, card->mp_wr_bitmap);

        return 0;
}

/*
 * This function polls the card status.
 */
static int
mwifiex_sdio_poll_card_status(struct mwifiex_adapter *adapter, u8 bits)
{
        u32 tries;
        u32 cs;

        for (tries = 0; tries < MAX_POLL_TRIES; tries++) {
                if (mwifiex_read_reg(adapter, CARD_STATUS_REG, &cs))
                        break;
                else if ((cs & bits) == bits)
                        return 0;

                udelay(10);
        }

        dev_err(adapter->dev, "poll card status failed, tries = %d\n",
               tries);
        return -1;
}

/*
 * This function reads the firmware status.
 */
static int
mwifiex_sdio_read_fw_status(struct mwifiex_adapter *adapter, u16 *dat)
{
        u32 fws0, fws1;

        if (mwifiex_read_reg(adapter, CARD_FW_STATUS0_REG, &fws0))
                return -1;

        if (mwifiex_read_reg(adapter, CARD_FW_STATUS1_REG, &fws1))
                return -1;

        *dat = (u16) ((fws1 << 8) | fws0);

        return 0;
}

/*
 * This function disables the host interrupt.
 *
 * The host interrupt mask is read, the disable bit is reset and
 * written back to the card host interrupt mask register.
 */
static int mwifiex_sdio_disable_host_int(struct mwifiex_adapter *adapter)
{
        u32 host_int_mask;

        /* Read back the host_int_mask register */
        if (mwifiex_read_reg(adapter, HOST_INT_MASK_REG, &host_int_mask))
                return -1;

        /* Update with the mask and write back to the register */
        host_int_mask &= ~HOST_INT_DISABLE;

        if (mwifiex_write_reg(adapter, HOST_INT_MASK_REG, host_int_mask)) {
                dev_err(adapter->dev, "disable host interrupt failed\n");
                return -1;
        }

        return 0;
}

/*
 * This function enables the host interrupt.
 *
 * The host interrupt enable mask is written to the card
 * host interrupt mask register.
 */
static int mwifiex_sdio_enable_host_int(struct mwifiex_adapter *adapter)
{
        /* Simply write the mask to the register */
        if (mwifiex_write_reg(adapter, HOST_INT_MASK_REG, HOST_INT_ENABLE)) {
                dev_err(adapter->dev, "enable host interrupt failed\n");
                return -1;
        }
        return 0;
}

/*
 * This function sends a data buffer to the card.
 */
static int mwifiex_sdio_card_to_host(struct mwifiex_adapter *adapter,
                                     u32 *type, u8 *buffer,
                                     u32 npayload, u32 ioport)
{
        int ret;
        u32 nb;

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

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

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

        nb = le16_to_cpu(*(__le16 *) (buffer));
        if (nb > npayload) {
                dev_err(adapter->dev, "%s: invalid packet, nb=%d, npayload=%d\n",
                                __func__, nb, npayload);
                return -1;
        }

        *type = le16_to_cpu(*(__le16 *) (buffer + 2));

        return ret;
}

/*
 * This function downloads the firmware to the card.
 *
 * Firmware is downloaded to the card in blocks. Every block download
 * is tested for CRC errors, and retried a number of times before
 * returning failure.
 */
static int mwifiex_prog_fw_w_helper(struct mwifiex_adapter *adapter,
                                    struct mwifiex_fw_image *fw)
{
        int ret;
        u8 *firmware = fw->fw_buf;
        u32 firmware_len = fw->fw_len;
        u32 offset = 0;
        u32 base0, base1;
        u8 *fwbuf;
        u16 len = 0;
        u32 txlen, tx_blocks = 0, tries;
        u32 i = 0;

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

        dev_dbg(adapter->dev, "info: downloading FW image (%d bytes)\n",
                        firmware_len);

        /* Assume that the allocated buffer is 8-byte aligned */
        fwbuf = kzalloc(MWIFIEX_UPLD_SIZE, GFP_KERNEL);
        if (!fwbuf) {
                dev_err(adapter->dev, "unable to alloc buffer for firmware."
                                " Terminating download\n");
                return -ENOMEM;
        }

        /* Perform firmware data transfer */
        do {
                /* The host polls for the DN_LD_CARD_RDY and CARD_IO_READY
                   bits */
                ret = mwifiex_sdio_poll_card_status(adapter, CARD_IO_READY |
                                                    DN_LD_CARD_RDY);
                if (ret) {
                        dev_err(adapter->dev, "FW download with helper:"
                                        " poll status timeout @ %d\n", offset);
                        goto done;
                }

                /* More data? */
                if (offset >= firmware_len)
                        break;

                for (tries = 0; tries < MAX_POLL_TRIES; tries++) {
                        ret = mwifiex_read_reg(adapter, HOST_F1_RD_BASE_0,
                                               &base0);
                        if (ret) {
                                dev_err(adapter->dev, "dev BASE0 register read"
                                        " failed: base0=0x%04X(%d). Terminating "
                                       "download\n", base0, base0);
                                goto done;
                        }
                        ret = mwifiex_read_reg(adapter, HOST_F1_RD_BASE_1,
                                               &base1);
                        if (ret) {
                                dev_err(adapter->dev, "dev BASE1 register read"
                                        " failed: base1=0x%04X(%d). Terminating "
                                       "download\n", base1, base1);
                                goto done;
                        }
                        len = (u16) (((base1 & 0xff) << 8) | (base0 & 0xff));

                        if (len)
                                break;

                        udelay(10);
                }

                if (!len) {
                        break;
                } else if (len > MWIFIEX_UPLD_SIZE) {
                        dev_err(adapter->dev, "FW download failed @ %d,"
                                " invalid length %d\n", offset, len);
                        ret = -1;
                        goto done;
                }

                txlen = len;

                if (len & BIT(0)) {
                        i++;
                        if (i > MAX_WRITE_IOMEM_RETRY) {
                                dev_err(adapter->dev, "FW download failed @"
                                        " %d, over max retry count\n", offset);
                                ret = -1;
                                goto done;
                        }
                        dev_err(adapter->dev, "CRC indicated by the helper:"
                               " len = 0x%04X, txlen = %d\n", len, txlen);
                        len &= ~BIT(0);
                        /* Setting this to 0 to resend from same offset */
                        txlen = 0;
                } else {
                        i = 0;

                        /* Set blocksize to transfer - checking for last
                           block */
                        if (firmware_len - offset < txlen)
                                txlen = firmware_len - offset;

                        tx_blocks = (txlen + MWIFIEX_SDIO_BLOCK_SIZE -
                                        1) / MWIFIEX_SDIO_BLOCK_SIZE;

                        /* Copy payload to buffer */
                        memmove(fwbuf, &firmware[offset], txlen);
                }

                ret = mwifiex_write_data_sync(adapter, fwbuf, tx_blocks *
                                              MWIFIEX_SDIO_BLOCK_SIZE,
                                              adapter->ioport);
                if (ret) {
                        dev_err(adapter->dev, "FW download, write iomem (%d)"
                                        " failed @ %d\n", i, offset);
                        if (mwifiex_write_reg(adapter, CONFIGURATION_REG, 0x04))
                                dev_err(adapter->dev, "write CFG reg failed\n");

                        ret = -1;
                        goto done;
                }

                offset += txlen;
        } while (true);

        dev_dbg(adapter->dev, "info: FW download over, size %d bytes\n",
                                                offset);

        ret = 0;
done:
        kfree(fwbuf);
        return ret;
}

/*
 * This function checks the firmware status in card.
 *
 * The winner interface is also determined by this function.
 */
static int mwifiex_check_fw_status(struct mwifiex_adapter *adapter,
                                   u32 poll_num, int *winner)
{
        int ret = 0;
        u16 firmware_stat;
        u32 tries;
        u32 winner_status;

        /* Wait for firmware initialization event */
        for (tries = 0; tries < poll_num; tries++) {
                ret = mwifiex_sdio_read_fw_status(adapter, &firmware_stat);
                if (ret)
                        continue;
                if (firmware_stat == FIRMWARE_READY) {
                        ret = 0;
                        break;
                } else {
                        mdelay(100);
                        ret = -1;
                }
        }

        if (winner && ret) {
                if (mwifiex_read_reg
                    (adapter, CARD_FW_STATUS0_REG, &winner_status))
                        winner_status = 0;

                if (winner_status)
                        *winner = 0;
                else
                        *winner = 1;
        }
        return ret;
}

/*
 * This function reads the interrupt status from card.
 */
static void mwifiex_interrupt_status(struct mwifiex_adapter *adapter)
{
        struct sdio_mmc_card *card = adapter->card;
        u32 sdio_ireg;
        unsigned long flags;

        if (mwifiex_read_data_sync(adapter, card->mp_regs, MAX_MP_REGS,
                                   REG_PORT | MWIFIEX_SDIO_BYTE_MODE_MASK,
                                   0)) {
                dev_err(adapter->dev, "read mp_regs failed\n");
                return;
        }

        sdio_ireg = card->mp_regs[HOST_INTSTATUS_REG];
        if (sdio_ireg) {
                /*
                 * DN_LD_HOST_INT_STATUS and/or UP_LD_HOST_INT_STATUS
                 * Clear the interrupt status register
                 */
                dev_dbg(adapter->dev, "int: sdio_ireg = %#x\n", sdio_ireg);
                spin_lock_irqsave(&adapter->int_lock, flags);
                adapter->int_status |= sdio_ireg;
                spin_unlock_irqrestore(&adapter->int_lock, flags);
        }
}

/*
 * SDIO interrupt handler.
 *
 * This function reads the interrupt status from firmware and assigns
 * the main process in workqueue which will handle the interrupt.
 */
static void
mwifiex_sdio_interrupt(struct sdio_func *func)
{
        struct mwifiex_adapter *adapter;
        struct sdio_mmc_card *card;

        card = sdio_get_drvdata(func);
        if (!card || !card->adapter) {
                pr_debug("int: func=%p card=%p adapter=%p\n",
                       func, card, card ? card->adapter : NULL);
                return;
        }
        adapter = card->adapter;

        if (adapter->surprise_removed)
                return;

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

        mwifiex_interrupt_status(adapter);
        queue_work(adapter->workqueue, &adapter->main_work);
}

/*
 * This function decodes a received packet.
 *
 * Based on the type, the packet is treated as either a data, or
 * a command response, or an event, and the correct handler
 * function is invoked.
 */
static int mwifiex_decode_rx_packet(struct mwifiex_adapter *adapter,
                                    struct sk_buff *skb, u32 upld_typ)
{
        u8 *cmd_buf;

        skb_pull(skb, INTF_HEADER_LEN);

        switch (upld_typ) {
        case MWIFIEX_TYPE_DATA:
                dev_dbg(adapter->dev, "info: --- Rx: Data packet ---\n");
                mwifiex_handle_rx_packet(adapter, skb);
                break;

        case MWIFIEX_TYPE_CMD:
                dev_dbg(adapter->dev, "info: --- Rx: Cmd Response ---\n");
                /* take care of curr_cmd = NULL case */
                if (!adapter->curr_cmd) {
                        cmd_buf = adapter->upld_buf;

                        if (adapter->ps_state == PS_STATE_SLEEP_CFM)
                                mwifiex_process_sleep_confirm_resp(adapter,
                                                        skb->data, skb->len);

                        memcpy(cmd_buf, skb->data, min_t(u32,
                                       MWIFIEX_SIZE_OF_CMD_BUFFER, skb->len));

                        dev_kfree_skb_any(skb);
                } else {
                        adapter->cmd_resp_received = true;
                        adapter->curr_cmd->resp_skb = skb;
                }
                break;

        case MWIFIEX_TYPE_EVENT:
                dev_dbg(adapter->dev, "info: --- Rx: Event ---\n");
                adapter->event_cause = *(u32 *) skb->data;

                skb_pull(skb, MWIFIEX_EVENT_HEADER_LEN);

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

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

                break;

        default:
                dev_err(adapter->dev, "unknown upload type %#x\n", upld_typ);
                dev_kfree_skb_any(skb);
                break;
        }

        return 0;
}

/*
 * This function transfers received packets from card to driver, performing
 * aggregation if required.
 *
 * For data received on control port, or if aggregation is disabled, the
 * received buffers are uploaded as separate packets. However, if aggregation
 * is enabled and required, the buffers are copied onto an aggregation buffer,
 * provided there is space left, processed and finally uploaded.
 */
static int mwifiex_sdio_card_to_host_mp_aggr(struct mwifiex_adapter *adapter,
                                             struct sk_buff *skb, u8 port)
{
        struct sdio_mmc_card *card = adapter->card;
        s32 f_do_rx_aggr = 0;
        s32 f_do_rx_cur = 0;
        s32 f_aggr_cur = 0;
        struct sk_buff *skb_deaggr;
        u32 pind;
        u32 pkt_len, pkt_type = 0;
        u8 *curr_ptr;
        u32 rx_len = skb->len;

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

                f_do_rx_cur = 1;
                goto rx_curr_single;
        }

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

                f_do_rx_cur = 1;
                goto rx_curr_single;
        }

        if (card->mp_rd_bitmap & (~((u16) CTRL_PORT_MASK))) {
                /* Some more data RX pending */
                dev_dbg(adapter->dev, "info: %s: not last packet\n", __func__);

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

        } else {
                /* No more data RX pending */
                dev_dbg(adapter->dev, "info: %s: last packet\n", __func__);

                if (MP_RX_AGGR_IN_PROGRESS(card)) {
                        f_do_rx_aggr = 1;
                        if (MP_RX_AGGR_BUF_HAS_ROOM(card, skb->len))
                                f_aggr_cur = 1;
                        else
                                /* No room in Aggr buf, do rx aggr now */
                                f_do_rx_cur = 1;
                } else {
                        f_do_rx_cur = 1;
                }
        }

        if (f_aggr_cur) {
                dev_dbg(adapter->dev, "info: current packet aggregation\n");
                /* Curr pkt can be aggregated */
                MP_RX_AGGR_SETUP(card, skb, port);

                if (MP_RX_AGGR_PKT_LIMIT_REACHED(card) ||
                    MP_RX_AGGR_PORT_LIMIT_REACHED(card)) {
                        dev_dbg(adapter->dev, "info: %s: aggregated packet "
                                        "limit reached\n", __func__);
                        /* No more pkts allowed in Aggr buf, rx it */
                        f_do_rx_aggr = 1;
                }
        }

        if (f_do_rx_aggr) {
                /* do aggr RX now */
                dev_dbg(adapter->dev, "info: do_rx_aggr: num of packets: %d\n",
                       card->mpa_rx.pkt_cnt);

                if (mwifiex_read_data_sync(adapter, card->mpa_rx.buf,
                                           card->mpa_rx.buf_len,
                                           (adapter->ioport | 0x1000 |
                                            (card->mpa_rx.ports << 4)) +
                                           card->mpa_rx.start_port, 1))
                        return -1;

                curr_ptr = card->mpa_rx.buf;

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

                        /* get curr PKT len & type */
                        pkt_len = *(u16 *) &curr_ptr[0];
                        pkt_type = *(u16 *) &curr_ptr[2];

                        /* copy pkt to deaggr buf */
                        skb_deaggr = card->mpa_rx.skb_arr[pind];

                        if ((pkt_type == MWIFIEX_TYPE_DATA) && (pkt_len <=
                                         card->mpa_rx.len_arr[pind])) {

                                memcpy(skb_deaggr->data, curr_ptr, pkt_len);

                                skb_trim(skb_deaggr, pkt_len);

                                /* Process de-aggr packet */
                                mwifiex_decode_rx_packet(adapter, skb_deaggr,
                                                         pkt_type);
                        } else {
                                dev_err(adapter->dev, "wrong aggr pkt:"
                                        " type=%d len=%d max_len=%d\n",
                                        pkt_type, pkt_len,
                                        card->mpa_rx.len_arr[pind]);
                                dev_kfree_skb_any(skb_deaggr);
                        }
                        curr_ptr += card->mpa_rx.len_arr[pind];
                }
                MP_RX_AGGR_BUF_RESET(card);
        }

rx_curr_single:
        if (f_do_rx_cur) {
                dev_dbg(adapter->dev, "info: RX: port: %d, rx_len: %d\n",
                        port, rx_len);

                if (mwifiex_sdio_card_to_host(adapter, &pkt_type,
                                              skb->data, skb->len,
                                              adapter->ioport + port))
                        return -1;

                mwifiex_decode_rx_packet(adapter, skb, pkt_type);
        }

        return 0;
}

/*
 * This function checks the current interrupt status.
 *
 * The following interrupts are checked and handled by this function -
 *      - Data sent
 *      - Command sent
 *      - Packets received
 *
 * Since the firmware does not generate download ready interrupt if the
 * port updated is command port only, command sent interrupt checking
 * should be done manually, and for every SDIO interrupt.
 *
 * In case of Rx packets received, the packets are uploaded from card to
 * host and processed accordingly.
 */
static int mwifiex_process_int_status(struct mwifiex_adapter *adapter)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret = 0;
        u8 sdio_ireg;
        struct sk_buff *skb;
        u8 port = CTRL_PORT;
        u32 len_reg_l, len_reg_u;
        u32 rx_blocks;
        u16 rx_len;
        unsigned long flags;

        spin_lock_irqsave(&adapter->int_lock, flags);
        sdio_ireg = adapter->int_status;
        adapter->int_status = 0;
        spin_unlock_irqrestore(&adapter->int_lock, flags);

        if (!sdio_ireg)
                return ret;

        if (sdio_ireg & DN_LD_HOST_INT_STATUS) {
                card->mp_wr_bitmap = ((u16) card->mp_regs[WR_BITMAP_U]) << 8;
                card->mp_wr_bitmap |= (u16) card->mp_regs[WR_BITMAP_L];
                dev_dbg(adapter->dev, "int: DNLD: wr_bitmap=0x%04x\n",
                                card->mp_wr_bitmap);
                if (adapter->data_sent &&
                    (card->mp_wr_bitmap & card->mp_data_port_mask)) {
                        dev_dbg(adapter->dev,
                                "info:  <--- Tx DONE Interrupt --->\n");
                        adapter->data_sent = false;
                }
        }

        /* As firmware will not generate download ready interrupt if the port
           updated is command port only, cmd_sent should be done for any SDIO
           interrupt. */
        if (adapter->cmd_sent) {
                /* Check if firmware has attach buffer at command port and
                   update just that in wr_bit_map. */
                card->mp_wr_bitmap |=
                        (u16) card->mp_regs[WR_BITMAP_L] & CTRL_PORT_MASK;
                if (card->mp_wr_bitmap & CTRL_PORT_MASK)
                        adapter->cmd_sent = false;
        }

        dev_dbg(adapter->dev, "info: cmd_sent=%d data_sent=%d\n",
               adapter->cmd_sent, adapter->data_sent);
        if (sdio_ireg & UP_LD_HOST_INT_STATUS) {
                card->mp_rd_bitmap = ((u16) card->mp_regs[RD_BITMAP_U]) << 8;
                card->mp_rd_bitmap |= (u16) card->mp_regs[RD_BITMAP_L];
                dev_dbg(adapter->dev, "int: UPLD: rd_bitmap=0x%04x\n",
                                card->mp_rd_bitmap);

                while (true) {
                        ret = mwifiex_get_rd_port(adapter, &port);
                        if (ret) {
                                dev_dbg(adapter->dev,
                                        "info: no more rd_port available\n");
                                break;
                        }
                        len_reg_l = RD_LEN_P0_L + (port << 1);
                        len_reg_u = RD_LEN_P0_U + (port << 1);
                        rx_len = ((u16) card->mp_regs[len_reg_u]) << 8;
                        rx_len |= (u16) card->mp_regs[len_reg_l];
                        dev_dbg(adapter->dev, "info: RX: port=%d rx_len=%u\n",
                                        port, rx_len);
                        rx_blocks =
                                (rx_len + MWIFIEX_SDIO_BLOCK_SIZE -
                                 1) / MWIFIEX_SDIO_BLOCK_SIZE;
                        if (rx_len <= INTF_HEADER_LEN
                            || (rx_blocks * MWIFIEX_SDIO_BLOCK_SIZE) >
                            MWIFIEX_RX_DATA_BUF_SIZE) {
                                dev_err(adapter->dev, "invalid rx_len=%d\n",
                                                rx_len);
                                return -1;
                        }
                        rx_len = (u16) (rx_blocks * MWIFIEX_SDIO_BLOCK_SIZE);

                        skb = dev_alloc_skb(rx_len);

                        if (!skb) {
                                dev_err(adapter->dev, "%s: failed to alloc skb",
                                                                __func__);
                                return -1;
                        }

                        skb_put(skb, rx_len);

                        dev_dbg(adapter->dev, "info: rx_len = %d skb->len = %d\n",
                                        rx_len, skb->len);

                        if (mwifiex_sdio_card_to_host_mp_aggr(adapter, skb,
                                                              port)) {
                                u32 cr = 0;

                                dev_err(adapter->dev, "card_to_host_mpa failed:"
                                                " int status=%#x\n", sdio_ireg);
                                if (mwifiex_read_reg(adapter,
                                                     CONFIGURATION_REG, &cr))
                                        dev_err(adapter->dev,
                                                        "read CFG reg failed\n");

                                dev_dbg(adapter->dev,
                                                "info: CFG reg val = %d\n", cr);
                                if (mwifiex_write_reg(adapter,
                                                      CONFIGURATION_REG,
                                                      (cr | 0x04)))
                                        dev_err(adapter->dev,
                                                        "write CFG reg failed\n");

                                dev_dbg(adapter->dev, "info: write success\n");
                                if (mwifiex_read_reg(adapter,
                                                     CONFIGURATION_REG, &cr))
                                        dev_err(adapter->dev,
                                                        "read CFG reg failed\n");

                                dev_dbg(adapter->dev,
                                                "info: CFG reg val =%x\n", cr);
                                dev_kfree_skb_any(skb);
                                return -1;
                        }
                }
        }

        return 0;
}

/*
 * This function aggregates transmission buffers in driver and downloads
 * the aggregated packet to card.
 *
 * The individual packets are aggregated by copying into an aggregation
 * buffer and then downloaded to the card. Previous unsent packets in the
 * aggregation buffer are pre-copied first before new packets are added.
 * Aggregation is done till there is space left in the aggregation buffer,
 * or till new packets are available.
 *
 * The function will only download the packet to the card when aggregation
 * stops, otherwise it will just aggregate the packet in aggregation buffer
 * and return.
 */
static int mwifiex_host_to_card_mp_aggr(struct mwifiex_adapter *adapter,
                                        u8 *payload, u32 pkt_len, u8 port,
                                        u32 next_pkt_len)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret = 0;
        s32 f_send_aggr_buf = 0;
        s32 f_send_cur_buf = 0;
        s32 f_precopy_cur_buf = 0;
        s32 f_postcopy_cur_buf = 0;

        if ((!card->mpa_tx.enabled) || (port == CTRL_PORT)) {
                dev_dbg(adapter->dev, "info: %s: tx aggregation disabled\n",
                                                __func__);

                f_send_cur_buf = 1;
                goto tx_curr_single;
        }

        if (next_pkt_len) {
                /* More pkt in TX queue */
                dev_dbg(adapter->dev, "info: %s: more packets in queue.\n",
                                                __func__);

                if (MP_TX_AGGR_IN_PROGRESS(card)) {
                        if (!MP_TX_AGGR_PORT_LIMIT_REACHED(card) &&
                            MP_TX_AGGR_BUF_HAS_ROOM(card, pkt_len)) {
                                f_precopy_cur_buf = 1;

                                if (!(card->mp_wr_bitmap &
                                                (1 << card->curr_wr_port))
                                                || !MP_TX_AGGR_BUF_HAS_ROOM(
                                                card, pkt_len + next_pkt_len))
                                        f_send_aggr_buf = 1;
                        } else {
                                /* No room in Aggr buf, send it */
                                f_send_aggr_buf = 1;

                                if (MP_TX_AGGR_PORT_LIMIT_REACHED(card) ||
                                    !(card->mp_wr_bitmap &
                                      (1 << card->curr_wr_port)))
                                        f_send_cur_buf = 1;
                                else
                                        f_postcopy_cur_buf = 1;
                        }
                } else {
                        if (MP_TX_AGGR_BUF_HAS_ROOM(card, pkt_len)
                            && (card->mp_wr_bitmap & (1 << card->curr_wr_port)))
                                f_precopy_cur_buf = 1;
                        else
                                f_send_cur_buf = 1;
                }
        } else {
                /* Last pkt in TX queue */
                dev_dbg(adapter->dev, "info: %s: Last packet in Tx Queue.\n",
                                                __func__);

                if (MP_TX_AGGR_IN_PROGRESS(card)) {
                        /* some packs in Aggr buf already */
                        f_send_aggr_buf = 1;

                        if (MP_TX_AGGR_BUF_HAS_ROOM(card, pkt_len))
                                f_precopy_cur_buf = 1;
                        else
                                /* No room in Aggr buf, send it */
                                f_send_cur_buf = 1;
                } else {
                        f_send_cur_buf = 1;
                }
        }

        if (f_precopy_cur_buf) {
                dev_dbg(adapter->dev, "data: %s: precopy current buffer\n",
                                                __func__);
                MP_TX_AGGR_BUF_PUT(card, payload, pkt_len, port);

                if (MP_TX_AGGR_PKT_LIMIT_REACHED(card) ||
                    MP_TX_AGGR_PORT_LIMIT_REACHED(card))
                        /* No more pkts allowed in Aggr buf, send it */
                        f_send_aggr_buf = 1;
        }

        if (f_send_aggr_buf) {
                dev_dbg(adapter->dev, "data: %s: send aggr buffer: %d %d\n",
                                __func__,
                                card->mpa_tx.start_port, card->mpa_tx.ports);
                ret = mwifiex_write_data_to_card(adapter, card->mpa_tx.buf,
                                                 card->mpa_tx.buf_len,
                                                 (adapter->ioport | 0x1000 |
                                                 (card->mpa_tx.ports << 4)) +
                                                  card->mpa_tx.start_port);

                MP_TX_AGGR_BUF_RESET(card);
        }

tx_curr_single:
        if (f_send_cur_buf) {
                dev_dbg(adapter->dev, "data: %s: send current buffer %d\n",
                                                __func__, port);
                ret = mwifiex_write_data_to_card(adapter, payload, pkt_len,
                                                 adapter->ioport + port);
        }

        if (f_postcopy_cur_buf) {
                dev_dbg(adapter->dev, "data: %s: postcopy current buffer\n",
                                                __func__);
                MP_TX_AGGR_BUF_PUT(card, payload, pkt_len, port);
        }

        return ret;
}

/*
 * This function downloads data from driver to card.
 *
 * Both commands and data packets are transferred to the card by this
 * function.
 *
 * This function adds the SDIO specific header to the front of the buffer
 * before transferring. The header contains the length of the packet and
 * the type. The firmware handles the packets based upon this set type.
 */
static int mwifiex_sdio_host_to_card(struct mwifiex_adapter *adapter,
                                     u8 type, u8 *payload, u32 pkt_len,
                                     struct mwifiex_tx_param *tx_param)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret;
        u32 buf_block_len;
        u32 blk_size;
        u8 port = CTRL_PORT;

        /* Allocate buffer and copy payload */
        blk_size = MWIFIEX_SDIO_BLOCK_SIZE;
        buf_block_len = (pkt_len + blk_size - 1) / blk_size;
        *(u16 *) &payload[0] = (u16) pkt_len;
        *(u16 *) &payload[2] = type;

        /*
         * This is SDIO specific header
         *  u16 length,
         *  u16 type (MWIFIEX_TYPE_DATA = 0, MWIFIEX_TYPE_CMD = 1,
         *  MWIFIEX_TYPE_EVENT = 3)
         */
        if (type == MWIFIEX_TYPE_DATA) {
                ret = mwifiex_get_wr_port_data(adapter, &port);
                if (ret) {
                        dev_err(adapter->dev, "%s: no wr_port available\n",
                                                __func__);
                        return ret;
                }
        } else {
                adapter->cmd_sent = true;
                /* Type must be MWIFIEX_TYPE_CMD */

                if (pkt_len <= INTF_HEADER_LEN ||
                    pkt_len > MWIFIEX_UPLD_SIZE)
                        dev_err(adapter->dev, "%s: payload=%p, nb=%d\n",
                                        __func__, payload, pkt_len);
        }

        /* Transfer data to card */
        pkt_len = buf_block_len * blk_size;

        if (tx_param)
                ret = mwifiex_host_to_card_mp_aggr(adapter, payload, pkt_len,
                                port, tx_param->next_pkt_len);
        else
                ret = mwifiex_host_to_card_mp_aggr(adapter, payload, pkt_len,
                                port, 0);

        if (ret) {
                if (type == MWIFIEX_TYPE_CMD)
                        adapter->cmd_sent = false;
                if (type == MWIFIEX_TYPE_DATA)
                        adapter->data_sent = false;
        } else {
                if (type == MWIFIEX_TYPE_DATA) {
                        if (!(card->mp_wr_bitmap & (1 << card->curr_wr_port)))
                                adapter->data_sent = true;
                        else
                                adapter->data_sent = false;
                }
        }

        return ret;
}

/*
 * This function allocates the MPA Tx and Rx buffers.
 */
static int mwifiex_alloc_sdio_mpa_buffers(struct mwifiex_adapter *adapter,
                                   u32 mpa_tx_buf_size, u32 mpa_rx_buf_size)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret = 0;

        card->mpa_tx.buf = kzalloc(mpa_tx_buf_size, GFP_KERNEL);
        if (!card->mpa_tx.buf) {
                dev_err(adapter->dev, "could not alloc buffer for MP-A TX\n");
                ret = -1;
                goto error;
        }

        card->mpa_tx.buf_size = mpa_tx_buf_size;

        card->mpa_rx.buf = kzalloc(mpa_rx_buf_size, GFP_KERNEL);
        if (!card->mpa_rx.buf) {
                dev_err(adapter->dev, "could not alloc buffer for MP-A RX\n");
                ret = -1;
                goto error;
        }

        card->mpa_rx.buf_size = mpa_rx_buf_size;

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

        return ret;
}

/*
 * This function unregisters the SDIO device.
 *
 * The SDIO IRQ is released, the function is disabled and driver
 * data is set to null.
 */
static void
mwifiex_unregister_dev(struct mwifiex_adapter *adapter)
{
        struct sdio_mmc_card *card = adapter->card;

        if (adapter->card) {
                /* Release the SDIO IRQ */
                sdio_claim_host(card->func);
                sdio_release_irq(card->func);
                sdio_disable_func(card->func);
                sdio_release_host(card->func);
                sdio_set_drvdata(card->func, NULL);
        }
}

/*
 * This function registers the SDIO device.
 *
 * SDIO IRQ is claimed, block size is set and driver data is initialized.
 */
static int mwifiex_register_dev(struct mwifiex_adapter *adapter)
{
        int ret = 0;
        struct sdio_mmc_card *card = adapter->card;
        struct sdio_func *func = card->func;

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

        sdio_claim_host(func);

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

        /* Set block size */
        ret = sdio_set_block_size(card->func, MWIFIEX_SDIO_BLOCK_SIZE);
        if (ret) {
                pr_err("cannot set SDIO block size\n");
                ret = -1;
                goto release_irq;
        }

        sdio_release_host(func);
        sdio_set_drvdata(func, card);

        adapter->dev = &func->dev;
        strcpy(adapter->fw_name, SD8787_DEFAULT_FW_NAME);

        return 0;

release_irq:
        sdio_release_irq(func);
disable_func:
        sdio_disable_func(func);
        sdio_release_host(func);
        adapter->card = NULL;

        return -1;
}

/*
 * This function initializes the SDIO driver.
 *
 * The following initializations steps are followed -
 *      - Read the Host interrupt status register to acknowledge
 *        the first interrupt got from bootloader
 *      - Disable host interrupt mask register
 *      - Get SDIO port
 *      - Initialize SDIO variables in card
 *      - Allocate MP registers
 *      - Allocate MPA Tx and Rx buffers
 */
static int mwifiex_init_sdio(struct mwifiex_adapter *adapter)
{
        struct sdio_mmc_card *card = adapter->card;
        int ret;
        u32 sdio_ireg;

        /*
         * Read the HOST_INT_STATUS_REG for ACK the first interrupt got
         * from the bootloader. If we don't do this we get a interrupt
         * as soon as we register the irq.
         */
        mwifiex_read_reg(adapter, HOST_INTSTATUS_REG, &sdio_ireg);

        /* Disable host interrupt mask register for SDIO */
        mwifiex_sdio_disable_host_int(adapter);

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

        /* Initialize SDIO variables in card */
        card->mp_rd_bitmap = 0;
        card->mp_wr_bitmap = 0;
        card->curr_rd_port = 1;
        card->curr_wr_port = 1;

        card->mp_data_port_mask = DATA_PORT_MASK;

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

        card->mpa_tx.enabled = 0;
        card->mpa_tx.pkt_aggr_limit = SDIO_MP_AGGR_DEF_PKT_LIMIT;

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

        card->mpa_rx.enabled = 0;
        card->mpa_rx.pkt_aggr_limit = SDIO_MP_AGGR_DEF_PKT_LIMIT;

        /* Allocate buffers for SDIO MP-A */
        card->mp_regs = kzalloc(MAX_MP_REGS, GFP_KERNEL);
        if (!card->mp_regs) {
                dev_err(adapter->dev, "failed to alloc mp_regs\n");
                return -ENOMEM;
        }

        ret = mwifiex_alloc_sdio_mpa_buffers(adapter,
                                             SDIO_MP_TX_AGGR_DEF_BUF_SIZE,
                                             SDIO_MP_RX_AGGR_DEF_BUF_SIZE);
        if (ret) {
                dev_err(adapter->dev, "failed to alloc sdio mp-a buffers\n");
                kfree(card->mp_regs);
                return -1;
        }

        return ret;
}

/*
 * This function resets the MPA Tx and Rx buffers.
 */
static void mwifiex_cleanup_mpa_buf(struct mwifiex_adapter *adapter)
{
        struct sdio_mmc_card *card = adapter->card;

        MP_TX_AGGR_BUF_RESET(card);
        MP_RX_AGGR_BUF_RESET(card);
}

/*
 * This function cleans up the allocated card buffers.
 *
 * The following are freed by this function -
 *      - MP registers
 *      - MPA Tx buffer
 *      - MPA Rx buffer
 */
static void mwifiex_cleanup_sdio(struct mwifiex_adapter *adapter)
{
        struct sdio_mmc_card *card = adapter->card;

        kfree(card->mp_regs);
        kfree(card->mpa_tx.buf);
        kfree(card->mpa_rx.buf);
}

/*
 * This function updates the MP end port in card.
 */
static void
mwifiex_update_mp_end_port(struct mwifiex_adapter *adapter, u16 port)
{
        struct sdio_mmc_card *card = adapter->card;
        int i;

        card->mp_end_port = port;

        card->mp_data_port_mask = DATA_PORT_MASK;

        for (i = 1; i <= MAX_PORT - card->mp_end_port; i++)
                card->mp_data_port_mask &= ~(1 << (MAX_PORT - i));

        card->curr_wr_port = 1;

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

static struct mwifiex_if_ops sdio_ops = {
        .init_if = mwifiex_init_sdio,
        .cleanup_if = mwifiex_cleanup_sdio,
        .check_fw_status = mwifiex_check_fw_status,
        .prog_fw = mwifiex_prog_fw_w_helper,
        .register_dev = mwifiex_register_dev,
        .unregister_dev = mwifiex_unregister_dev,
        .enable_int = mwifiex_sdio_enable_host_int,
        .process_int_status = mwifiex_process_int_status,
        .host_to_card = mwifiex_sdio_host_to_card,
        .wakeup = mwifiex_pm_wakeup_card,
        .wakeup_complete = mwifiex_pm_wakeup_card_complete,

        /* SDIO specific */
        .update_mp_end_port = mwifiex_update_mp_end_port,
        .cleanup_mpa_buf = mwifiex_cleanup_mpa_buf,
};

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

        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("mrvl/sd8787_uapsta.bin");