mwl8k.c

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/*
 * drivers/net/wireless/mwl8k.c
 * Driver for Marvell TOPDOG 802.11 Wireless cards
 *
 * Copyright (C) 2008, 2009, 2010 Marvell Semiconductor Inc.
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/completion.h>
#include <linux/etherdevice.h>
#include <linux/slab.h>
#include <net/mac80211.h>
#include <linux/moduleparam.h>
#include <linux/firmware.h>
#include <linux/workqueue.h>

#define MWL8K_DESC  "Marvell TOPDOG(R) 802.11 Wireless Network Driver"
#define MWL8K_NAME  KBUILD_MODNAME
#define MWL8K_VERSION   "0.13"

/* Module parameters */
static bool ap_mode_default;
module_param(ap_mode_default, bool, 0);
MODULE_PARM_DESC(ap_mode_default,
         "Set to 1 to make ap mode the default instead of sta mode");

/* Register definitions */
#define MWL8K_HIU_GEN_PTR           0x00000c10
#define  MWL8K_MODE_STA              0x0000005a
#define  MWL8K_MODE_AP               0x000000a5
#define MWL8K_HIU_INT_CODE          0x00000c14
#define  MWL8K_FWSTA_READY           0xf0f1f2f4
#define  MWL8K_FWAP_READY            0xf1f2f4a5
#define  MWL8K_INT_CODE_CMD_FINISHED         0x00000005
#define MWL8K_HIU_SCRATCH           0x00000c40

/* Host->device communications */
#define MWL8K_HIU_H2A_INTERRUPT_EVENTS      0x00000c18
#define MWL8K_HIU_H2A_INTERRUPT_STATUS      0x00000c1c
#define MWL8K_HIU_H2A_INTERRUPT_MASK        0x00000c20
#define MWL8K_HIU_H2A_INTERRUPT_CLEAR_SEL   0x00000c24
#define MWL8K_HIU_H2A_INTERRUPT_STATUS_MASK 0x00000c28
#define  MWL8K_H2A_INT_DUMMY             (1 << 20)
#define  MWL8K_H2A_INT_RESET             (1 << 15)
#define  MWL8K_H2A_INT_DOORBELL          (1 << 1)
#define  MWL8K_H2A_INT_PPA_READY         (1 << 0)

/* Device->host communications */
#define MWL8K_HIU_A2H_INTERRUPT_EVENTS      0x00000c2c
#define MWL8K_HIU_A2H_INTERRUPT_STATUS      0x00000c30
#define MWL8K_HIU_A2H_INTERRUPT_MASK        0x00000c34
#define MWL8K_HIU_A2H_INTERRUPT_CLEAR_SEL   0x00000c38
#define MWL8K_HIU_A2H_INTERRUPT_STATUS_MASK 0x00000c3c
#define  MWL8K_A2H_INT_DUMMY             (1 << 20)
#define  MWL8K_A2H_INT_BA_WATCHDOG       (1 << 14)
#define  MWL8K_A2H_INT_CHNL_SWITCHED         (1 << 11)
#define  MWL8K_A2H_INT_QUEUE_EMPTY       (1 << 10)
#define  MWL8K_A2H_INT_RADAR_DETECT      (1 << 7)
#define  MWL8K_A2H_INT_RADIO_ON          (1 << 6)
#define  MWL8K_A2H_INT_RADIO_OFF         (1 << 5)
#define  MWL8K_A2H_INT_MAC_EVENT         (1 << 3)
#define  MWL8K_A2H_INT_OPC_DONE          (1 << 2)
#define  MWL8K_A2H_INT_RX_READY          (1 << 1)
#define  MWL8K_A2H_INT_TX_DONE           (1 << 0)

/* HW micro second timer register
 * located at offset 0xA600. This
 * will be used to timestamp tx
 * packets.
 */

#define MWL8K_HW_TIMER_REGISTER         0x0000a600

#define MWL8K_A2H_EVENTS    (MWL8K_A2H_INT_DUMMY | \
                 MWL8K_A2H_INT_CHNL_SWITCHED | \
                 MWL8K_A2H_INT_QUEUE_EMPTY | \
                 MWL8K_A2H_INT_RADAR_DETECT | \
                 MWL8K_A2H_INT_RADIO_ON | \
                 MWL8K_A2H_INT_RADIO_OFF | \
                 MWL8K_A2H_INT_MAC_EVENT | \
                 MWL8K_A2H_INT_OPC_DONE | \
                 MWL8K_A2H_INT_RX_READY | \
                 MWL8K_A2H_INT_TX_DONE | \
                 MWL8K_A2H_INT_BA_WATCHDOG)

#define MWL8K_RX_QUEUES     1
#define MWL8K_TX_WMM_QUEUES 4
#define MWL8K_MAX_AMPDU_QUEUES  8
#define MWL8K_MAX_TX_QUEUES (MWL8K_TX_WMM_QUEUES + MWL8K_MAX_AMPDU_QUEUES)
#define mwl8k_tx_queues(priv)   (MWL8K_TX_WMM_QUEUES + (priv)->num_ampdu_queues)

struct rxd_ops {
    int rxd_size;
    void (*rxd_init)(void *rxd, dma_addr_t next_dma_addr);
    void (*rxd_refill)(void *rxd, dma_addr_t addr, int len);
    int (*rxd_process)(void *rxd, struct ieee80211_rx_status *status,
               __le16 *qos, s8 *noise);
};

struct mwl8k_device_info {
    char *part_name;
    char *helper_image;
    char *fw_image_sta;
    char *fw_image_ap;
    struct rxd_ops *ap_rxd_ops;
    u32 fw_api_ap;
};

struct mwl8k_rx_queue {
    int rxd_count;

    /* hw receives here */
    int head;

    /* refill descs here */
    int tail;

    void *rxd;
    dma_addr_t rxd_dma;
    struct {
        struct sk_buff *skb;
        DEFINE_DMA_UNMAP_ADDR(dma);
    } *buf;
};

struct mwl8k_tx_queue {
    /* hw transmits here */
    int head;

    /* sw appends here */
    int tail;

    unsigned int len;
    struct mwl8k_tx_desc *txd;
    dma_addr_t txd_dma;
    struct sk_buff **skb;
};

enum {
    AMPDU_NO_STREAM,
    AMPDU_STREAM_NEW,
    AMPDU_STREAM_IN_PROGRESS,
    AMPDU_STREAM_ACTIVE,
};

struct mwl8k_ampdu_stream {
    struct ieee80211_sta *sta;
    u8 tid;
    u8 state;
    u8 idx;
    u8 txq_idx; /* index of this stream in priv->txq */
};

struct mwl8k_priv {
    struct ieee80211_hw *hw;
    struct pci_dev *pdev;
    int irq;

    struct mwl8k_device_info *device_info;

    void __iomem *sram;
    void __iomem *regs;

    /* firmware */
    const struct firmware *fw_helper;
    const struct firmware *fw_ucode;

    /* hardware/firmware parameters */
    bool ap_fw;
    struct rxd_ops *rxd_ops;
    struct ieee80211_supported_band band_24;
    struct ieee80211_channel channels_24[14];
    struct ieee80211_rate rates_24[14];
    struct ieee80211_supported_band band_50;
    struct ieee80211_channel channels_50[4];
    struct ieee80211_rate rates_50[9];
    u32 ap_macids_supported;
    u32 sta_macids_supported;

    /* Ampdu stream information */
    u8 num_ampdu_queues;
    spinlock_t stream_lock;
    struct mwl8k_ampdu_stream ampdu[MWL8K_MAX_AMPDU_QUEUES];
    struct work_struct watchdog_ba_handle;

    /* firmware access */
    struct mutex fw_mutex;
    struct task_struct *fw_mutex_owner;
    struct task_struct *hw_restart_owner;
    int fw_mutex_depth;
    struct completion *hostcmd_wait;

    /* lock held over TX and TX reap */
    spinlock_t tx_lock;

    /* TX quiesce completion, protected by fw_mutex and tx_lock */
    struct completion *tx_wait;

    /* List of interfaces.  */
    u32 macids_used;
    struct list_head vif_list;

    /* power management status cookie from firmware */
    u32 *cookie;
    dma_addr_t cookie_dma;

    u16 num_mcaddrs;
    u8 hw_rev;
    u32 fw_rev;

    /*
     * Running count of TX packets in flight, to avoid
     * iterating over the transmit rings each time.
     */
    int pending_tx_pkts;

    struct mwl8k_rx_queue rxq[MWL8K_RX_QUEUES];
    struct mwl8k_tx_queue txq[MWL8K_MAX_TX_QUEUES];
    u32 txq_offset[MWL8K_MAX_TX_QUEUES];

    bool radio_on;
    bool radio_short_preamble;
    bool sniffer_enabled;
    bool wmm_enabled;

    /* XXX need to convert this to handle multiple interfaces */
    bool capture_beacon;
    u8 capture_bssid[ETH_ALEN];
    struct sk_buff *beacon_skb;

    /*
     * This FJ worker has to be global as it is scheduled from the
     * RX handler.  At this point we don't know which interface it
     * belongs to until the list of bssids waiting to complete join
     * is checked.
     */
    struct work_struct finalize_join_worker;

    /* Tasklet to perform TX reclaim.  */
    struct tasklet_struct poll_tx_task;

    /* Tasklet to perform RX.  */
    struct tasklet_struct poll_rx_task;

    /* Most recently reported noise in dBm */
    s8 noise;

    /*
     * preserve the queue configurations so they can be restored if/when
     * the firmware image is swapped.
     */
    struct ieee80211_tx_queue_params wmm_params[MWL8K_TX_WMM_QUEUES];

    /* To perform the task of reloading the firmware */
    struct work_struct fw_reload;
    bool hw_restart_in_progress;

    /* async firmware loading state */
    unsigned fw_state;
    char *fw_pref;
    char *fw_alt;
    struct completion firmware_loading_complete;
};

#define MAX_WEP_KEY_LEN         13
#define NUM_WEP_KEYS            4

/* Per interface specific private data */
struct mwl8k_vif {
    struct list_head list;
    struct ieee80211_vif *vif;

    /* Firmware macid for this vif.  */
    int macid;

    /* Non AMPDU sequence number assigned by driver.  */
    u16 seqno;

    /* Saved WEP keys */
    struct {
        u8 enabled;
        u8 key[sizeof(struct ieee80211_key_conf) + MAX_WEP_KEY_LEN];
    } wep_key_conf[NUM_WEP_KEYS];

    /* BSSID */
    u8 bssid[ETH_ALEN];

    /* A flag to indicate is HW crypto is enabled for this bssid */
    bool is_hw_crypto_enabled;
};
#define MWL8K_VIF(_vif) ((struct mwl8k_vif *)&((_vif)->drv_priv))
#define IEEE80211_KEY_CONF(_u8) ((struct ieee80211_key_conf *)(_u8))

struct tx_traffic_info {
    u32 start_time;
    u32 pkts;
};

#define MWL8K_MAX_TID 8
struct mwl8k_sta {
    /* Index into station database. Returned by UPDATE_STADB.  */
    u8 peer_id;
    u8 is_ampdu_allowed;
    struct tx_traffic_info tx_stats[MWL8K_MAX_TID];
};
#define MWL8K_STA(_sta) ((struct mwl8k_sta *)&((_sta)->drv_priv))

static const struct ieee80211_channel mwl8k_channels_24[] = {
    { .center_freq = 2412, .hw_value = 1, },
    { .center_freq = 2417, .hw_value = 2, },
    { .center_freq = 2422, .hw_value = 3, },
    { .center_freq = 2427, .hw_value = 4, },
    { .center_freq = 2432, .hw_value = 5, },
    { .center_freq = 2437, .hw_value = 6, },
    { .center_freq = 2442, .hw_value = 7, },
    { .center_freq = 2447, .hw_value = 8, },
    { .center_freq = 2452, .hw_value = 9, },
    { .center_freq = 2457, .hw_value = 10, },
    { .center_freq = 2462, .hw_value = 11, },
    { .center_freq = 2467, .hw_value = 12, },
    { .center_freq = 2472, .hw_value = 13, },
    { .center_freq = 2484, .hw_value = 14, },
};

static const struct ieee80211_rate mwl8k_rates_24[] = {
    { .bitrate = 10, .hw_value = 2, },
    { .bitrate = 20, .hw_value = 4, },
    { .bitrate = 55, .hw_value = 11, },
    { .bitrate = 110, .hw_value = 22, },
    { .bitrate = 220, .hw_value = 44, },
    { .bitrate = 60, .hw_value = 12, },
    { .bitrate = 90, .hw_value = 18, },
    { .bitrate = 120, .hw_value = 24, },
    { .bitrate = 180, .hw_value = 36, },
    { .bitrate = 240, .hw_value = 48, },
    { .bitrate = 360, .hw_value = 72, },
    { .bitrate = 480, .hw_value = 96, },
    { .bitrate = 540, .hw_value = 108, },
    { .bitrate = 720, .hw_value = 144, },
};

static const struct ieee80211_channel mwl8k_channels_50[] = {
    { .center_freq = 5180, .hw_value = 36, },
    { .center_freq = 5200, .hw_value = 40, },
    { .center_freq = 5220, .hw_value = 44, },
    { .center_freq = 5240, .hw_value = 48, },
};

static const struct ieee80211_rate mwl8k_rates_50[] = {
    { .bitrate = 60, .hw_value = 12, },
    { .bitrate = 90, .hw_value = 18, },
    { .bitrate = 120, .hw_value = 24, },
    { .bitrate = 180, .hw_value = 36, },
    { .bitrate = 240, .hw_value = 48, },
    { .bitrate = 360, .hw_value = 72, },
    { .bitrate = 480, .hw_value = 96, },
    { .bitrate = 540, .hw_value = 108, },
    { .bitrate = 720, .hw_value = 144, },
};

/* Set or get info from Firmware */
#define MWL8K_CMD_GET           0x0000
#define MWL8K_CMD_SET           0x0001
#define MWL8K_CMD_SET_LIST      0x0002

/* Firmware command codes */
#define MWL8K_CMD_CODE_DNLD     0x0001
#define MWL8K_CMD_GET_HW_SPEC       0x0003
#define MWL8K_CMD_SET_HW_SPEC       0x0004
#define MWL8K_CMD_MAC_MULTICAST_ADR 0x0010
#define MWL8K_CMD_GET_STAT      0x0014
#define MWL8K_CMD_RADIO_CONTROL     0x001c
#define MWL8K_CMD_RF_TX_POWER       0x001e
#define MWL8K_CMD_TX_POWER      0x001f
#define MWL8K_CMD_RF_ANTENNA        0x0020
#define MWL8K_CMD_SET_BEACON        0x0100      /* per-vif */
#define MWL8K_CMD_SET_PRE_SCAN      0x0107
#define MWL8K_CMD_SET_POST_SCAN     0x0108
#define MWL8K_CMD_SET_RF_CHANNEL    0x010a
#define MWL8K_CMD_SET_AID       0x010d
#define MWL8K_CMD_SET_RATE      0x0110
#define MWL8K_CMD_SET_FINALIZE_JOIN 0x0111
#define MWL8K_CMD_RTS_THRESHOLD     0x0113
#define MWL8K_CMD_SET_SLOT      0x0114
#define MWL8K_CMD_SET_EDCA_PARAMS   0x0115
#define MWL8K_CMD_SET_WMM_MODE      0x0123
#define MWL8K_CMD_MIMO_CONFIG       0x0125
#define MWL8K_CMD_USE_FIXED_RATE    0x0126
#define MWL8K_CMD_ENABLE_SNIFFER    0x0150
#define MWL8K_CMD_SET_MAC_ADDR      0x0202      /* per-vif */
#define MWL8K_CMD_SET_RATEADAPT_MODE    0x0203
#define MWL8K_CMD_GET_WATCHDOG_BITMAP   0x0205
#define MWL8K_CMD_DEL_MAC_ADDR      0x0206      /* per-vif */
#define MWL8K_CMD_BSS_START     0x1100      /* per-vif */
#define MWL8K_CMD_SET_NEW_STN       0x1111      /* per-vif */
#define MWL8K_CMD_UPDATE_ENCRYPTION 0x1122      /* per-vif */
#define MWL8K_CMD_UPDATE_STADB      0x1123
#define MWL8K_CMD_BASTREAM      0x1125

static const char *mwl8k_cmd_name(__le16 cmd, char *buf, int bufsize)
{
    u16 command = le16_to_cpu(cmd);

#define MWL8K_CMDNAME(x)    case MWL8K_CMD_##x: do {\
                    snprintf(buf, bufsize, "%s", #x);\
                    return buf;\
                    } while (0)
    switch (command & ~0x8000) {
        MWL8K_CMDNAME(CODE_DNLD);
        MWL8K_CMDNAME(GET_HW_SPEC);
        MWL8K_CMDNAME(SET_HW_SPEC);
        MWL8K_CMDNAME(MAC_MULTICAST_ADR);
        MWL8K_CMDNAME(GET_STAT);
        MWL8K_CMDNAME(RADIO_CONTROL);
        MWL8K_CMDNAME(RF_TX_POWER);
        MWL8K_CMDNAME(TX_POWER);
        MWL8K_CMDNAME(RF_ANTENNA);
        MWL8K_CMDNAME(SET_BEACON);
        MWL8K_CMDNAME(SET_PRE_SCAN);
        MWL8K_CMDNAME(SET_POST_SCAN);
        MWL8K_CMDNAME(SET_RF_CHANNEL);
        MWL8K_CMDNAME(SET_AID);
        MWL8K_CMDNAME(SET_RATE);
        MWL8K_CMDNAME(SET_FINALIZE_JOIN);
        MWL8K_CMDNAME(RTS_THRESHOLD);
        MWL8K_CMDNAME(SET_SLOT);
        MWL8K_CMDNAME(SET_EDCA_PARAMS);
        MWL8K_CMDNAME(SET_WMM_MODE);
        MWL8K_CMDNAME(MIMO_CONFIG);
        MWL8K_CMDNAME(USE_FIXED_RATE);
        MWL8K_CMDNAME(ENABLE_SNIFFER);
        MWL8K_CMDNAME(SET_MAC_ADDR);
        MWL8K_CMDNAME(SET_RATEADAPT_MODE);
        MWL8K_CMDNAME(BSS_START);
        MWL8K_CMDNAME(SET_NEW_STN);
        MWL8K_CMDNAME(UPDATE_ENCRYPTION);
        MWL8K_CMDNAME(UPDATE_STADB);
        MWL8K_CMDNAME(BASTREAM);
        MWL8K_CMDNAME(GET_WATCHDOG_BITMAP);
    default:
        snprintf(buf, bufsize, "0x%x", cmd);
    }
#undef MWL8K_CMDNAME

    return buf;
}

/* Hardware and firmware reset */
static void mwl8k_hw_reset(struct mwl8k_priv *priv)
{
    iowrite32(MWL8K_H2A_INT_RESET,
        priv->regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
    iowrite32(MWL8K_H2A_INT_RESET,
        priv->regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
    msleep(20);
}

/* Release fw image */
static void mwl8k_release_fw(const struct firmware **fw)
{
    if (*fw == NULL)
        return;
    release_firmware(*fw);
    *fw = NULL;
}

static void mwl8k_release_firmware(struct mwl8k_priv *priv)
{
    mwl8k_release_fw(&priv->fw_ucode);
    mwl8k_release_fw(&priv->fw_helper);
}

/* states for asynchronous f/w loading */
static void mwl8k_fw_state_machine(const struct firmware *fw, void *context);
enum {
    FW_STATE_INIT = 0,
    FW_STATE_LOADING_PREF,
    FW_STATE_LOADING_ALT,
    FW_STATE_ERROR,
};

/* Request fw image */
static int mwl8k_request_fw(struct mwl8k_priv *priv,
                const char *fname, const struct firmware **fw,
                bool nowait)
{
    /* release current image */
    if (*fw != NULL)
        mwl8k_release_fw(fw);

    if (nowait)
        return request_firmware_nowait(THIS_MODULE, 1, fname,
                           &priv->pdev->dev, GFP_KERNEL,
                           priv, mwl8k_fw_state_machine);
    else
        return request_firmware(fw, fname, &priv->pdev->dev);
}

static int mwl8k_request_firmware(struct mwl8k_priv *priv, char *fw_image,
                  bool nowait)
{
    struct mwl8k_device_info *di = priv->device_info;
    int rc;

    if (di->helper_image != NULL) {
        if (nowait)
            rc = mwl8k_request_fw(priv, di->helper_image,
                          &priv->fw_helper, true);
        else
            rc = mwl8k_request_fw(priv, di->helper_image,
                          &priv->fw_helper, false);
        if (rc)
            printk(KERN_ERR "%s: Error requesting helper fw %s\n",
                   pci_name(priv->pdev), di->helper_image);

        if (rc || nowait)
            return rc;
    }

    if (nowait) {
        /*
         * if we get here, no helper image is needed.  Skip the
         * FW_STATE_INIT state.
         */
        priv->fw_state = FW_STATE_LOADING_PREF;
        rc = mwl8k_request_fw(priv, fw_image,
                      &priv->fw_ucode,
                      true);
    } else
        rc = mwl8k_request_fw(priv, fw_image,
                      &priv->fw_ucode, false);
    if (rc) {
        printk(KERN_ERR "%s: Error requesting firmware file %s\n",
               pci_name(priv->pdev), fw_image);
        mwl8k_release_fw(&priv->fw_helper);
        return rc;
    }

    return 0;
}

struct mwl8k_cmd_pkt {
    __le16  code;
    __le16  length;
    __u8    seq_num;
    __u8    macid;
    __le16  result;
    char    payload[0];
} __packed;

/*
 * Firmware loading.
 */
static int
mwl8k_send_fw_load_cmd(struct mwl8k_priv *priv, void *data, int length)
{
    void __iomem *regs = priv->regs;
    dma_addr_t dma_addr;
    int loops;

    dma_addr = pci_map_single(priv->pdev, data, length, PCI_DMA_TODEVICE);
    if (pci_dma_mapping_error(priv->pdev, dma_addr))
        return -ENOMEM;

    iowrite32(dma_addr, regs + MWL8K_HIU_GEN_PTR);
    iowrite32(0, regs + MWL8K_HIU_INT_CODE);
    iowrite32(MWL8K_H2A_INT_DOORBELL,
        regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
    iowrite32(MWL8K_H2A_INT_DUMMY,
        regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);

    loops = 1000;
    do {
        u32 int_code;

        int_code = ioread32(regs + MWL8K_HIU_INT_CODE);
        if (int_code == MWL8K_INT_CODE_CMD_FINISHED) {
            iowrite32(0, regs + MWL8K_HIU_INT_CODE);
            break;
        }

        cond_resched();
        udelay(1);
    } while (--loops);

    pci_unmap_single(priv->pdev, dma_addr, length, PCI_DMA_TODEVICE);

    return loops ? 0 : -ETIMEDOUT;
}

static int mwl8k_load_fw_image(struct mwl8k_priv *priv,
                const u8 *data, size_t length)
{
    struct mwl8k_cmd_pkt *cmd;
    int done;
    int rc = 0;

    cmd = kmalloc(sizeof(*cmd) + 256, GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->code = cpu_to_le16(MWL8K_CMD_CODE_DNLD);
    cmd->seq_num = 0;
    cmd->macid = 0;
    cmd->result = 0;

    done = 0;
    while (length) {
        int block_size = length > 256 ? 256 : length;

        memcpy(cmd->payload, data + done, block_size);
        cmd->length = cpu_to_le16(block_size);

        rc = mwl8k_send_fw_load_cmd(priv, cmd,
                        sizeof(*cmd) + block_size);
        if (rc)
            break;

        done += block_size;
        length -= block_size;
    }

    if (!rc) {
        cmd->length = 0;
        rc = mwl8k_send_fw_load_cmd(priv, cmd, sizeof(*cmd));
    }

    kfree(cmd);

    return rc;
}

static int mwl8k_feed_fw_image(struct mwl8k_priv *priv,
                const u8 *data, size_t length)
{
    unsigned char *buffer;
    int may_continue, rc = 0;
    u32 done, prev_block_size;

    buffer = kmalloc(1024, GFP_KERNEL);
    if (buffer == NULL)
        return -ENOMEM;

    done = 0;
    prev_block_size = 0;
    may_continue = 1000;
    while (may_continue > 0) {
        u32 block_size;

        block_size = ioread32(priv->regs + MWL8K_HIU_SCRATCH);
        if (block_size & 1) {
            block_size &= ~1;
            may_continue--;
        } else {
            done += prev_block_size;
            length -= prev_block_size;
        }

        if (block_size > 1024 || block_size > length) {
            rc = -EOVERFLOW;
            break;
        }

        if (length == 0) {
            rc = 0;
            break;
        }

        if (block_size == 0) {
            rc = -EPROTO;
            may_continue--;
            udelay(1);
            continue;
        }

        prev_block_size = block_size;
        memcpy(buffer, data + done, block_size);

        rc = mwl8k_send_fw_load_cmd(priv, buffer, block_size);
        if (rc)
            break;
    }

    if (!rc && length != 0)
        rc = -EREMOTEIO;

    kfree(buffer);

    return rc;
}

static int mwl8k_load_firmware(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;
    const struct firmware *fw = priv->fw_ucode;
    int rc;
    int loops;

    if (!memcmp(fw->data, "\x01\x00\x00\x00", 4)) {
        const struct firmware *helper = priv->fw_helper;

        if (helper == NULL) {
            printk(KERN_ERR "%s: helper image needed but none "
                   "given\n", pci_name(priv->pdev));
            return -EINVAL;
        }

        rc = mwl8k_load_fw_image(priv, helper->data, helper->size);
        if (rc) {
            printk(KERN_ERR "%s: unable to load firmware "
                   "helper image\n", pci_name(priv->pdev));
            return rc;
        }
        msleep(20);

        rc = mwl8k_feed_fw_image(priv, fw->data, fw->size);
    } else {
        rc = mwl8k_load_fw_image(priv, fw->data, fw->size);
    }

    if (rc) {
        printk(KERN_ERR "%s: unable to load firmware image\n",
               pci_name(priv->pdev));
        return rc;
    }

    iowrite32(MWL8K_MODE_STA, priv->regs + MWL8K_HIU_GEN_PTR);

    loops = 500000;
    do {
        u32 ready_code;

        ready_code = ioread32(priv->regs + MWL8K_HIU_INT_CODE);
        if (ready_code == MWL8K_FWAP_READY) {
            priv->ap_fw = true;
            break;
        } else if (ready_code == MWL8K_FWSTA_READY) {
            priv->ap_fw = false;
            break;
        }

        cond_resched();
        udelay(1);
    } while (--loops);

    return loops ? 0 : -ETIMEDOUT;
}


/* DMA header used by firmware and hardware.  */
struct mwl8k_dma_data {
    __le16 fwlen;
    struct ieee80211_hdr wh;
    char data[0];
} __packed;

/* Routines to add/remove DMA header from skb.  */
static inline void mwl8k_remove_dma_header(struct sk_buff *skb, __le16 qos)
{
    struct mwl8k_dma_data *tr;
    int hdrlen;

    tr = (struct mwl8k_dma_data *)skb->data;
    hdrlen = ieee80211_hdrlen(tr->wh.frame_control);

    if (hdrlen != sizeof(tr->wh)) {
        if (ieee80211_is_data_qos(tr->wh.frame_control)) {
            memmove(tr->data - hdrlen, &tr->wh, hdrlen - 2);
            *((__le16 *)(tr->data - 2)) = qos;
        } else {
            memmove(tr->data - hdrlen, &tr->wh, hdrlen);
        }
    }

    if (hdrlen != sizeof(*tr))
        skb_pull(skb, sizeof(*tr) - hdrlen);
}

#define REDUCED_TX_HEADROOM 8

static void
mwl8k_add_dma_header(struct mwl8k_priv *priv, struct sk_buff *skb,
                        int head_pad, int tail_pad)
{
    struct ieee80211_hdr *wh;
    int hdrlen;
    int reqd_hdrlen;
    struct mwl8k_dma_data *tr;

    /*
     * Add a firmware DMA header; the firmware requires that we
     * present a 2-byte payload length followed by a 4-address
     * header (without QoS field), followed (optionally) by any
     * WEP/ExtIV header (but only filled in for CCMP).
     */
    wh = (struct ieee80211_hdr *)skb->data;

    hdrlen = ieee80211_hdrlen(wh->frame_control);

    /*
     * Check if skb_resize is required because of
     * tx_headroom adjustment.
     */
    if (priv->ap_fw && (hdrlen < (sizeof(struct ieee80211_cts)
                        + REDUCED_TX_HEADROOM))) {
        if (pskb_expand_head(skb, REDUCED_TX_HEADROOM, 0, GFP_ATOMIC)) {

            wiphy_err(priv->hw->wiphy,
                    "Failed to reallocate TX buffer\n");
            return;
        }
        skb->truesize += REDUCED_TX_HEADROOM;
    }

    reqd_hdrlen = sizeof(*tr) + head_pad;

    if (hdrlen != reqd_hdrlen)
        skb_push(skb, reqd_hdrlen - hdrlen);

    if (ieee80211_is_data_qos(wh->frame_control))
        hdrlen -= IEEE80211_QOS_CTL_LEN;

    tr = (struct mwl8k_dma_data *)skb->data;
    if (wh != &tr->wh)
        memmove(&tr->wh, wh, hdrlen);
    if (hdrlen != sizeof(tr->wh))
        memset(((void *)&tr->wh) + hdrlen, 0, sizeof(tr->wh) - hdrlen);

    /*
     * Firmware length is the length of the fully formed "802.11
     * payload".  That is, everything except for the 802.11 header.
     * This includes all crypto material including the MIC.
     */
    tr->fwlen = cpu_to_le16(skb->len - sizeof(*tr) + tail_pad);
}

static void mwl8k_encapsulate_tx_frame(struct mwl8k_priv *priv,
        struct sk_buff *skb)
{
    struct ieee80211_hdr *wh;
    struct ieee80211_tx_info *tx_info;
    struct ieee80211_key_conf *key_conf;
    int data_pad;
    int head_pad = 0;

    wh = (struct ieee80211_hdr *)skb->data;

    tx_info = IEEE80211_SKB_CB(skb);

    key_conf = NULL;
    if (ieee80211_is_data(wh->frame_control))
        key_conf = tx_info->control.hw_key;

    /*
     * Make sure the packet header is in the DMA header format (4-address
     * without QoS), and add head & tail padding when HW crypto is enabled.
     *
     * We have the following trailer padding requirements:
     * - WEP: 4 trailer bytes (ICV)
     * - TKIP: 12 trailer bytes (8 MIC + 4 ICV)
     * - CCMP: 8 trailer bytes (MIC)
     */
    data_pad = 0;
    if (key_conf != NULL) {
        head_pad = key_conf->iv_len;
        switch (key_conf->cipher) {
        case WLAN_CIPHER_SUITE_WEP40:
        case WLAN_CIPHER_SUITE_WEP104:
            data_pad = 4;
            break;
        case WLAN_CIPHER_SUITE_TKIP:
            data_pad = 12;
            break;
        case WLAN_CIPHER_SUITE_CCMP:
            data_pad = 8;
            break;
        }
    }
    mwl8k_add_dma_header(priv, skb, head_pad, data_pad);
}

/*
 * Packet reception for 88w8366 AP firmware.
 */
struct mwl8k_rxd_8366_ap {
    __le16 pkt_len;
    __u8 sq2;
    __u8 rate;
    __le32 pkt_phys_addr;
    __le32 next_rxd_phys_addr;
    __le16 qos_control;
    __le16 htsig2;
    __le32 hw_rssi_info;
    __le32 hw_noise_floor_info;
    __u8 noise_floor;
    __u8 pad0[3];
    __u8 rssi;
    __u8 rx_status;
    __u8 channel;
    __u8 rx_ctrl;
} __packed;

#define MWL8K_8366_AP_RATE_INFO_MCS_FORMAT  0x80
#define MWL8K_8366_AP_RATE_INFO_40MHZ       0x40
#define MWL8K_8366_AP_RATE_INFO_RATEID(x)   ((x) & 0x3f)

#define MWL8K_8366_AP_RX_CTRL_OWNED_BY_HOST 0x80

/* 8366 AP rx_status bits */
#define MWL8K_8366_AP_RXSTAT_DECRYPT_ERR_MASK       0x80
#define MWL8K_8366_AP_RXSTAT_GENERAL_DECRYPT_ERR    0xFF
#define MWL8K_8366_AP_RXSTAT_TKIP_DECRYPT_MIC_ERR   0x02
#define MWL8K_8366_AP_RXSTAT_WEP_DECRYPT_ICV_ERR    0x04
#define MWL8K_8366_AP_RXSTAT_TKIP_DECRYPT_ICV_ERR   0x08

static void mwl8k_rxd_8366_ap_init(void *_rxd, dma_addr_t next_dma_addr)
{
    struct mwl8k_rxd_8366_ap *rxd = _rxd;

    rxd->next_rxd_phys_addr = cpu_to_le32(next_dma_addr);
    rxd->rx_ctrl = MWL8K_8366_AP_RX_CTRL_OWNED_BY_HOST;
}

static void mwl8k_rxd_8366_ap_refill(void *_rxd, dma_addr_t addr, int len)
{
    struct mwl8k_rxd_8366_ap *rxd = _rxd;

    rxd->pkt_len = cpu_to_le16(len);
    rxd->pkt_phys_addr = cpu_to_le32(addr);
    wmb();
    rxd->rx_ctrl = 0;
}

static int
mwl8k_rxd_8366_ap_process(void *_rxd, struct ieee80211_rx_status *status,
              __le16 *qos, s8 *noise)
{
    struct mwl8k_rxd_8366_ap *rxd = _rxd;

    if (!(rxd->rx_ctrl & MWL8K_8366_AP_RX_CTRL_OWNED_BY_HOST))
        return -1;
    rmb();

    memset(status, 0, sizeof(*status));

    status->signal = -rxd->rssi;
    *noise = -rxd->noise_floor;

    if (rxd->rate & MWL8K_8366_AP_RATE_INFO_MCS_FORMAT) {
        status->flag |= RX_FLAG_HT;
        if (rxd->rate & MWL8K_8366_AP_RATE_INFO_40MHZ)
            status->flag |= RX_FLAG_40MHZ;
        status->rate_idx = MWL8K_8366_AP_RATE_INFO_RATEID(rxd->rate);
    } else {
        int i;

        for (i = 0; i < ARRAY_SIZE(mwl8k_rates_24); i++) {
            if (mwl8k_rates_24[i].hw_value == rxd->rate) {
                status->rate_idx = i;
                break;
            }
        }
    }

    if (rxd->channel > 14) {
        status->band = IEEE80211_BAND_5GHZ;
        if (!(status->flag & RX_FLAG_HT))
            status->rate_idx -= 5;
    } else {
        status->band = IEEE80211_BAND_2GHZ;
    }
    status->freq = ieee80211_channel_to_frequency(rxd->channel,
                              status->band);

    *qos = rxd->qos_control;

    if ((rxd->rx_status != MWL8K_8366_AP_RXSTAT_GENERAL_DECRYPT_ERR) &&
        (rxd->rx_status & MWL8K_8366_AP_RXSTAT_DECRYPT_ERR_MASK) &&
        (rxd->rx_status & MWL8K_8366_AP_RXSTAT_TKIP_DECRYPT_MIC_ERR))
        status->flag |= RX_FLAG_MMIC_ERROR;

    return le16_to_cpu(rxd->pkt_len);
}

static struct rxd_ops rxd_8366_ap_ops = {
    .rxd_size   = sizeof(struct mwl8k_rxd_8366_ap),
    .rxd_init   = mwl8k_rxd_8366_ap_init,
    .rxd_refill = mwl8k_rxd_8366_ap_refill,
    .rxd_process    = mwl8k_rxd_8366_ap_process,
};

/*
 * Packet reception for STA firmware.
 */
struct mwl8k_rxd_sta {
    __le16 pkt_len;
    __u8 link_quality;
    __u8 noise_level;
    __le32 pkt_phys_addr;
    __le32 next_rxd_phys_addr;
    __le16 qos_control;
    __le16 rate_info;
    __le32 pad0[4];
    __u8 rssi;
    __u8 channel;
    __le16 pad1;
    __u8 rx_ctrl;
    __u8 rx_status;
    __u8 pad2[2];
} __packed;

#define MWL8K_STA_RATE_INFO_SHORTPRE        0x8000
#define MWL8K_STA_RATE_INFO_ANTSELECT(x)    (((x) >> 11) & 0x3)
#define MWL8K_STA_RATE_INFO_RATEID(x)       (((x) >> 3) & 0x3f)
#define MWL8K_STA_RATE_INFO_40MHZ       0x0004
#define MWL8K_STA_RATE_INFO_SHORTGI     0x0002
#define MWL8K_STA_RATE_INFO_MCS_FORMAT      0x0001

#define MWL8K_STA_RX_CTRL_OWNED_BY_HOST     0x02
#define MWL8K_STA_RX_CTRL_DECRYPT_ERROR     0x04
/* ICV=0 or MIC=1 */
#define MWL8K_STA_RX_CTRL_DEC_ERR_TYPE      0x08
/* Key is uploaded only in failure case */
#define MWL8K_STA_RX_CTRL_KEY_INDEX         0x30

static void mwl8k_rxd_sta_init(void *_rxd, dma_addr_t next_dma_addr)
{
    struct mwl8k_rxd_sta *rxd = _rxd;

    rxd->next_rxd_phys_addr = cpu_to_le32(next_dma_addr);
    rxd->rx_ctrl = MWL8K_STA_RX_CTRL_OWNED_BY_HOST;
}

static void mwl8k_rxd_sta_refill(void *_rxd, dma_addr_t addr, int len)
{
    struct mwl8k_rxd_sta *rxd = _rxd;

    rxd->pkt_len = cpu_to_le16(len);
    rxd->pkt_phys_addr = cpu_to_le32(addr);
    wmb();
    rxd->rx_ctrl = 0;
}

static int
mwl8k_rxd_sta_process(void *_rxd, struct ieee80211_rx_status *status,
               __le16 *qos, s8 *noise)
{
    struct mwl8k_rxd_sta *rxd = _rxd;
    u16 rate_info;

    if (!(rxd->rx_ctrl & MWL8K_STA_RX_CTRL_OWNED_BY_HOST))
        return -1;
    rmb();

    rate_info = le16_to_cpu(rxd->rate_info);

    memset(status, 0, sizeof(*status));

    status->signal = -rxd->rssi;
    *noise = -rxd->noise_level;
    status->antenna = MWL8K_STA_RATE_INFO_ANTSELECT(rate_info);
    status->rate_idx = MWL8K_STA_RATE_INFO_RATEID(rate_info);

    if (rate_info & MWL8K_STA_RATE_INFO_SHORTPRE)
        status->flag |= RX_FLAG_SHORTPRE;
    if (rate_info & MWL8K_STA_RATE_INFO_40MHZ)
        status->flag |= RX_FLAG_40MHZ;
    if (rate_info & MWL8K_STA_RATE_INFO_SHORTGI)
        status->flag |= RX_FLAG_SHORT_GI;
    if (rate_info & MWL8K_STA_RATE_INFO_MCS_FORMAT)
        status->flag |= RX_FLAG_HT;

    if (rxd->channel > 14) {
        status->band = IEEE80211_BAND_5GHZ;
        if (!(status->flag & RX_FLAG_HT))
            status->rate_idx -= 5;
    } else {
        status->band = IEEE80211_BAND_2GHZ;
    }
    status->freq = ieee80211_channel_to_frequency(rxd->channel,
                              status->band);

    *qos = rxd->qos_control;
    if ((rxd->rx_ctrl & MWL8K_STA_RX_CTRL_DECRYPT_ERROR) &&
        (rxd->rx_ctrl & MWL8K_STA_RX_CTRL_DEC_ERR_TYPE))
        status->flag |= RX_FLAG_MMIC_ERROR;

    return le16_to_cpu(rxd->pkt_len);
}

static struct rxd_ops rxd_sta_ops = {
    .rxd_size   = sizeof(struct mwl8k_rxd_sta),
    .rxd_init   = mwl8k_rxd_sta_init,
    .rxd_refill = mwl8k_rxd_sta_refill,
    .rxd_process    = mwl8k_rxd_sta_process,
};


#define MWL8K_RX_DESCS      256
#define MWL8K_RX_MAXSZ      3800

static int mwl8k_rxq_init(struct ieee80211_hw *hw, int index)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_rx_queue *rxq = priv->rxq + index;
    int size;
    int i;

    rxq->rxd_count = 0;
    rxq->head = 0;
    rxq->tail = 0;

    size = MWL8K_RX_DESCS * priv->rxd_ops->rxd_size;

    rxq->rxd = pci_alloc_consistent(priv->pdev, size, &rxq->rxd_dma);
    if (rxq->rxd == NULL) {
        wiphy_err(hw->wiphy, "failed to alloc RX descriptors\n");
        return -ENOMEM;
    }
    memset(rxq->rxd, 0, size);

    rxq->buf = kcalloc(MWL8K_RX_DESCS, sizeof(*rxq->buf), GFP_KERNEL);
    if (rxq->buf == NULL) {
        wiphy_err(hw->wiphy, "failed to alloc RX skbuff list\n");
        pci_free_consistent(priv->pdev, size, rxq->rxd, rxq->rxd_dma);
        return -ENOMEM;
    }

    for (i = 0; i < MWL8K_RX_DESCS; i++) {
        int desc_size;
        void *rxd;
        int nexti;
        dma_addr_t next_dma_addr;

        desc_size = priv->rxd_ops->rxd_size;
        rxd = rxq->rxd + (i * priv->rxd_ops->rxd_size);

        nexti = i + 1;
        if (nexti == MWL8K_RX_DESCS)
            nexti = 0;
        next_dma_addr = rxq->rxd_dma + (nexti * desc_size);

        priv->rxd_ops->rxd_init(rxd, next_dma_addr);
    }

    return 0;
}

static int rxq_refill(struct ieee80211_hw *hw, int index, int limit)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_rx_queue *rxq = priv->rxq + index;
    int refilled;

    refilled = 0;
    while (rxq->rxd_count < MWL8K_RX_DESCS && limit--) {
        struct sk_buff *skb;
        dma_addr_t addr;
        int rx;
        void *rxd;

        skb = dev_alloc_skb(MWL8K_RX_MAXSZ);
        if (skb == NULL)
            break;

        addr = pci_map_single(priv->pdev, skb->data,
                      MWL8K_RX_MAXSZ, DMA_FROM_DEVICE);

        rxq->rxd_count++;
        rx = rxq->tail++;
        if (rxq->tail == MWL8K_RX_DESCS)
            rxq->tail = 0;
        rxq->buf[rx].skb = skb;
        dma_unmap_addr_set(&rxq->buf[rx], dma, addr);

        rxd = rxq->rxd + (rx * priv->rxd_ops->rxd_size);
        priv->rxd_ops->rxd_refill(rxd, addr, MWL8K_RX_MAXSZ);

        refilled++;
    }

    return refilled;
}

/* Must be called only when the card's reception is completely halted */
static void mwl8k_rxq_deinit(struct ieee80211_hw *hw, int index)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_rx_queue *rxq = priv->rxq + index;
    int i;

    if (rxq->rxd == NULL)
        return;

    for (i = 0; i < MWL8K_RX_DESCS; i++) {
        if (rxq->buf[i].skb != NULL) {
            pci_unmap_single(priv->pdev,
                     dma_unmap_addr(&rxq->buf[i], dma),
                     MWL8K_RX_MAXSZ, PCI_DMA_FROMDEVICE);
            dma_unmap_addr_set(&rxq->buf[i], dma, 0);

            kfree_skb(rxq->buf[i].skb);
            rxq->buf[i].skb = NULL;
        }
    }

    kfree(rxq->buf);
    rxq->buf = NULL;

    pci_free_consistent(priv->pdev,
                MWL8K_RX_DESCS * priv->rxd_ops->rxd_size,
                rxq->rxd, rxq->rxd_dma);
    rxq->rxd = NULL;
}


/*
 * Scan a list of BSSIDs to process for finalize join.
 * Allows for extension to process multiple BSSIDs.
 */
static inline int
mwl8k_capture_bssid(struct mwl8k_priv *priv, struct ieee80211_hdr *wh)
{
    return priv->capture_beacon &&
        ieee80211_is_beacon(wh->frame_control) &&
        ether_addr_equal(wh->addr3, priv->capture_bssid);
}

static inline void mwl8k_save_beacon(struct ieee80211_hw *hw,
                     struct sk_buff *skb)
{
    struct mwl8k_priv *priv = hw->priv;

    priv->capture_beacon = false;
    memset(priv->capture_bssid, 0, ETH_ALEN);

    /*
     * Use GFP_ATOMIC as rxq_process is called from
     * the primary interrupt handler, memory allocation call
     * must not sleep.
     */
    priv->beacon_skb = skb_copy(skb, GFP_ATOMIC);
    if (priv->beacon_skb != NULL)
        ieee80211_queue_work(hw, &priv->finalize_join_worker);
}

static inline struct mwl8k_vif *mwl8k_find_vif_bss(struct list_head *vif_list,
                           u8 *bssid)
{
    struct mwl8k_vif *mwl8k_vif;

    list_for_each_entry(mwl8k_vif,
                vif_list, list) {
        if (memcmp(bssid, mwl8k_vif->bssid,
               ETH_ALEN) == 0)
            return mwl8k_vif;
    }

    return NULL;
}

static int rxq_process(struct ieee80211_hw *hw, int index, int limit)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_vif *mwl8k_vif = NULL;
    struct mwl8k_rx_queue *rxq = priv->rxq + index;
    int processed;

    processed = 0;
    while (rxq->rxd_count && limit--) {
        struct sk_buff *skb;
        void *rxd;
        int pkt_len;
        struct ieee80211_rx_status status;
        struct ieee80211_hdr *wh;
        __le16 qos;

        skb = rxq->buf[rxq->head].skb;
        if (skb == NULL)
            break;

        rxd = rxq->rxd + (rxq->head * priv->rxd_ops->rxd_size);

        pkt_len = priv->rxd_ops->rxd_process(rxd, &status, &qos,
                            &priv->noise);
        if (pkt_len < 0)
            break;

        rxq->buf[rxq->head].skb = NULL;

        pci_unmap_single(priv->pdev,
                 dma_unmap_addr(&rxq->buf[rxq->head], dma),
                 MWL8K_RX_MAXSZ, PCI_DMA_FROMDEVICE);
        dma_unmap_addr_set(&rxq->buf[rxq->head], dma, 0);

        rxq->head++;
        if (rxq->head == MWL8K_RX_DESCS)
            rxq->head = 0;

        rxq->rxd_count--;

        wh = &((struct mwl8k_dma_data *)skb->data)->wh;

        /*
         * Check for a pending join operation.  Save a
         * copy of the beacon and schedule a tasklet to
         * send a FINALIZE_JOIN command to the firmware.
         */
        if (mwl8k_capture_bssid(priv, (void *)skb->data))
            mwl8k_save_beacon(hw, skb);

        if (ieee80211_has_protected(wh->frame_control)) {

            /* Check if hw crypto has been enabled for
             * this bss. If yes, set the status flags
             * accordingly
             */
            mwl8k_vif = mwl8k_find_vif_bss(&priv->vif_list,
                                wh->addr1);

            if (mwl8k_vif != NULL &&
                mwl8k_vif->is_hw_crypto_enabled) {
                /*
                 * When MMIC ERROR is encountered
                 * by the firmware, payload is
                 * dropped and only 32 bytes of
                 * mwl8k Firmware header is sent
                 * to the host.
                 *
                 * We need to add four bytes of
                 * key information.  In it
                 * MAC80211 expects keyidx set to
                 * 0 for triggering Counter
                 * Measure of MMIC failure.
                 */
                if (status.flag & RX_FLAG_MMIC_ERROR) {
                    struct mwl8k_dma_data *tr;
                    tr = (struct mwl8k_dma_data *)skb->data;
                    memset((void *)&(tr->data), 0, 4);
                    pkt_len += 4;
                }

                if (!ieee80211_is_auth(wh->frame_control))
                    status.flag |= RX_FLAG_IV_STRIPPED |
                               RX_FLAG_DECRYPTED |
                               RX_FLAG_MMIC_STRIPPED;
            }
        }

        skb_put(skb, pkt_len);
        mwl8k_remove_dma_header(skb, qos);
        memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
        ieee80211_rx_irqsafe(hw, skb);

        processed++;
    }

    return processed;
}


/*
 * Packet transmission.
 */

#define MWL8K_TXD_STATUS_OK         0x00000001
#define MWL8K_TXD_STATUS_OK_RETRY       0x00000002
#define MWL8K_TXD_STATUS_OK_MORE_RETRY      0x00000004
#define MWL8K_TXD_STATUS_MULTICAST_TX       0x00000008
#define MWL8K_TXD_STATUS_FW_OWNED       0x80000000

#define MWL8K_QOS_QLEN_UNSPEC           0xff00
#define MWL8K_QOS_ACK_POLICY_MASK       0x0060
#define MWL8K_QOS_ACK_POLICY_NORMAL     0x0000
#define MWL8K_QOS_ACK_POLICY_BLOCKACK       0x0060
#define MWL8K_QOS_EOSP              0x0010

struct mwl8k_tx_desc {
    __le32 status;
    __u8 data_rate;
    __u8 tx_priority;
    __le16 qos_control;
    __le32 pkt_phys_addr;
    __le16 pkt_len;
    __u8 dest_MAC_addr[ETH_ALEN];
    __le32 next_txd_phys_addr;
    __le32 timestamp;
    __le16 rate_info;
    __u8 peer_id;
    __u8 tx_frag_cnt;
} __packed;

#define MWL8K_TX_DESCS      128

static int mwl8k_txq_init(struct ieee80211_hw *hw, int index)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_tx_queue *txq = priv->txq + index;
    int size;
    int i;

    txq->len = 0;
    txq->head = 0;
    txq->tail = 0;

    size = MWL8K_TX_DESCS * sizeof(struct mwl8k_tx_desc);

    txq->txd = pci_alloc_consistent(priv->pdev, size, &txq->txd_dma);
    if (txq->txd == NULL) {
        wiphy_err(hw->wiphy, "failed to alloc TX descriptors\n");
        return -ENOMEM;
    }
    memset(txq->txd, 0, size);

    txq->skb = kcalloc(MWL8K_TX_DESCS, sizeof(*txq->skb), GFP_KERNEL);
    if (txq->skb == NULL) {
        wiphy_err(hw->wiphy, "failed to alloc TX skbuff list\n");
        pci_free_consistent(priv->pdev, size, txq->txd, txq->txd_dma);
        return -ENOMEM;
    }

    for (i = 0; i < MWL8K_TX_DESCS; i++) {
        struct mwl8k_tx_desc *tx_desc;
        int nexti;

        tx_desc = txq->txd + i;
        nexti = (i + 1) % MWL8K_TX_DESCS;

        tx_desc->status = 0;
        tx_desc->next_txd_phys_addr =
            cpu_to_le32(txq->txd_dma + nexti * sizeof(*tx_desc));
    }

    return 0;
}

static inline void mwl8k_tx_start(struct mwl8k_priv *priv)
{
    iowrite32(MWL8K_H2A_INT_PPA_READY,
        priv->regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
    iowrite32(MWL8K_H2A_INT_DUMMY,
        priv->regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
    ioread32(priv->regs + MWL8K_HIU_INT_CODE);
}

static void mwl8k_dump_tx_rings(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;
    int i;

    for (i = 0; i < mwl8k_tx_queues(priv); i++) {
        struct mwl8k_tx_queue *txq = priv->txq + i;
        int fw_owned = 0;
        int drv_owned = 0;
        int unused = 0;
        int desc;

        for (desc = 0; desc < MWL8K_TX_DESCS; desc++) {
            struct mwl8k_tx_desc *tx_desc = txq->txd + desc;
            u32 status;

            status = le32_to_cpu(tx_desc->status);
            if (status & MWL8K_TXD_STATUS_FW_OWNED)
                fw_owned++;
            else
                drv_owned++;

            if (tx_desc->pkt_len == 0)
                unused++;
        }

        wiphy_err(hw->wiphy,
              "txq[%d] len=%d head=%d tail=%d "
              "fw_owned=%d drv_owned=%d unused=%d\n",
              i,
              txq->len, txq->head, txq->tail,
              fw_owned, drv_owned, unused);
    }
}

/*
 * Must be called with priv->fw_mutex held and tx queues stopped.
 */
#define MWL8K_TX_WAIT_TIMEOUT_MS    5000

static int mwl8k_tx_wait_empty(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;
    DECLARE_COMPLETION_ONSTACK(tx_wait);
    int retry;
    int rc;

    might_sleep();

    /* Since fw restart is in progress, allow only the firmware
     * commands from the restart code and block the other
     * commands since they are going to fail in any case since
     * the firmware has crashed
     */
    if (priv->hw_restart_in_progress) {
        if (priv->hw_restart_owner == current)
            return 0;
        else
            return -EBUSY;
    }

    /*
     * The TX queues are stopped at this point, so this test
     * doesn't need to take ->tx_lock.
     */
    if (!priv->pending_tx_pkts)
        return 0;

    retry = 0;
    rc = 0;

    spin_lock_bh(&priv->tx_lock);
    priv->tx_wait = &tx_wait;
    while (!rc) {
        int oldcount;
        unsigned long timeout;

        oldcount = priv->pending_tx_pkts;

        spin_unlock_bh(&priv->tx_lock);
        timeout = wait_for_completion_timeout(&tx_wait,
                msecs_to_jiffies(MWL8K_TX_WAIT_TIMEOUT_MS));
        spin_lock_bh(&priv->tx_lock);

        if (timeout) {
            WARN_ON(priv->pending_tx_pkts);
            if (retry)
                wiphy_notice(hw->wiphy, "tx rings drained\n");
            break;
        }

        if (priv->pending_tx_pkts < oldcount) {
            wiphy_notice(hw->wiphy,
                     "waiting for tx rings to drain (%d -> %d pkts)\n",
                     oldcount, priv->pending_tx_pkts);
            retry = 1;
            continue;
        }

        priv->tx_wait = NULL;

        wiphy_err(hw->wiphy, "tx rings stuck for %d ms\n",
              MWL8K_TX_WAIT_TIMEOUT_MS);
        mwl8k_dump_tx_rings(hw);
        priv->hw_restart_in_progress = true;
        ieee80211_queue_work(hw, &priv->fw_reload);

        rc = -ETIMEDOUT;
    }
    spin_unlock_bh(&priv->tx_lock);

    return rc;
}

#define MWL8K_TXD_SUCCESS(status)               \
    ((status) & (MWL8K_TXD_STATUS_OK |          \
             MWL8K_TXD_STATUS_OK_RETRY |        \
             MWL8K_TXD_STATUS_OK_MORE_RETRY))

static int mwl8k_tid_queue_mapping(u8 tid)
{
    BUG_ON(tid > 7);

    switch (tid) {
    case 0:
    case 3:
        return IEEE80211_AC_BE;
        break;
    case 1:
    case 2:
        return IEEE80211_AC_BK;
        break;
    case 4:
    case 5:
        return IEEE80211_AC_VI;
        break;
    case 6:
    case 7:
        return IEEE80211_AC_VO;
        break;
    default:
        return -1;
        break;
    }
}

/* The firmware will fill in the rate information
 * for each packet that gets queued in the hardware
 * and these macros will interpret that info.
 */

#define RI_FORMAT(a)          (a & 0x0001)
#define RI_RATE_ID_MCS(a)    ((a & 0x01f8) >> 3)

static int
mwl8k_txq_reclaim(struct ieee80211_hw *hw, int index, int limit, int force)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_tx_queue *txq = priv->txq + index;
    int processed;

    processed = 0;
    while (txq->len > 0 && limit--) {
        int tx;
        struct mwl8k_tx_desc *tx_desc;
        unsigned long addr;
        int size;
        struct sk_buff *skb;
        struct ieee80211_tx_info *info;
        u32 status;
        struct ieee80211_sta *sta;
        struct mwl8k_sta *sta_info = NULL;
        u16 rate_info;
        struct ieee80211_hdr *wh;

        tx = txq->head;
        tx_desc = txq->txd + tx;

        status = le32_to_cpu(tx_desc->status);

        if (status & MWL8K_TXD_STATUS_FW_OWNED) {
            if (!force)
                break;
            tx_desc->status &=
                ~cpu_to_le32(MWL8K_TXD_STATUS_FW_OWNED);
        }

        txq->head = (tx + 1) % MWL8K_TX_DESCS;
        BUG_ON(txq->len == 0);
        txq->len--;
        priv->pending_tx_pkts--;

        addr = le32_to_cpu(tx_desc->pkt_phys_addr);
        size = le16_to_cpu(tx_desc->pkt_len);
        skb = txq->skb[tx];
        txq->skb[tx] = NULL;

        BUG_ON(skb == NULL);
        pci_unmap_single(priv->pdev, addr, size, PCI_DMA_TODEVICE);

        mwl8k_remove_dma_header(skb, tx_desc->qos_control);

        wh = (struct ieee80211_hdr *) skb->data;

        /* Mark descriptor as unused */
        tx_desc->pkt_phys_addr = 0;
        tx_desc->pkt_len = 0;

        info = IEEE80211_SKB_CB(skb);
        if (ieee80211_is_data(wh->frame_control)) {
            rcu_read_lock();
            sta = ieee80211_find_sta_by_ifaddr(hw, wh->addr1,
                               wh->addr2);
            if (sta) {
                sta_info = MWL8K_STA(sta);
                BUG_ON(sta_info == NULL);
                rate_info = le16_to_cpu(tx_desc->rate_info);
                /* If rate is < 6.5 Mpbs for an ht station
                 * do not form an ampdu. If the station is a
                 * legacy station (format = 0), do not form an
                 * ampdu
                 */
                if (RI_RATE_ID_MCS(rate_info) < 1 ||
                    RI_FORMAT(rate_info) == 0) {
                    sta_info->is_ampdu_allowed = false;
                } else {
                    sta_info->is_ampdu_allowed = true;
                }
            }
            rcu_read_unlock();
        }

        ieee80211_tx_info_clear_status(info);

        /* Rate control is happening in the firmware.
         * Ensure no tx rate is being reported.
         */
        info->status.rates[0].idx = -1;
        info->status.rates[0].count = 1;

        if (MWL8K_TXD_SUCCESS(status))
            info->flags |= IEEE80211_TX_STAT_ACK;

        ieee80211_tx_status_irqsafe(hw, skb);

        processed++;
    }

    return processed;
}

/* must be called only when the card's transmit is completely halted */
static void mwl8k_txq_deinit(struct ieee80211_hw *hw, int index)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_tx_queue *txq = priv->txq + index;

    if (txq->txd == NULL)
        return;

    mwl8k_txq_reclaim(hw, index, INT_MAX, 1);

    kfree(txq->skb);
    txq->skb = NULL;

    pci_free_consistent(priv->pdev,
                MWL8K_TX_DESCS * sizeof(struct mwl8k_tx_desc),
                txq->txd, txq->txd_dma);
    txq->txd = NULL;
}

/* caller must hold priv->stream_lock when calling the stream functions */
static struct mwl8k_ampdu_stream *
mwl8k_add_stream(struct ieee80211_hw *hw, struct ieee80211_sta *sta, u8 tid)
{
    struct mwl8k_ampdu_stream *stream;
    struct mwl8k_priv *priv = hw->priv;
    int i;

    for (i = 0; i < priv->num_ampdu_queues; i++) {
        stream = &priv->ampdu[i];
        if (stream->state == AMPDU_NO_STREAM) {
            stream->sta = sta;
            stream->state = AMPDU_STREAM_NEW;
            stream->tid = tid;
            stream->idx = i;
            stream->txq_idx = MWL8K_TX_WMM_QUEUES + i;
            wiphy_debug(hw->wiphy, "Added a new stream for %pM %d",
                    sta->addr, tid);
            return stream;
        }
    }
    return NULL;
}

static int
mwl8k_start_stream(struct ieee80211_hw *hw, struct mwl8k_ampdu_stream *stream)
{
    int ret;

    /* if the stream has already been started, don't start it again */
    if (stream->state != AMPDU_STREAM_NEW)
        return 0;
    ret = ieee80211_start_tx_ba_session(stream->sta, stream->tid, 0);
    if (ret)
        wiphy_debug(hw->wiphy, "Failed to start stream for %pM %d: "
                "%d\n", stream->sta->addr, stream->tid, ret);
    else
        wiphy_debug(hw->wiphy, "Started stream for %pM %d\n",
                stream->sta->addr, stream->tid);
    return ret;
}

static void
mwl8k_remove_stream(struct ieee80211_hw *hw, struct mwl8k_ampdu_stream *stream)
{
    wiphy_debug(hw->wiphy, "Remove stream for %pM %d\n", stream->sta->addr,
            stream->tid);
    memset(stream, 0, sizeof(*stream));
}

static struct mwl8k_ampdu_stream *
mwl8k_lookup_stream(struct ieee80211_hw *hw, u8 *addr, u8 tid)
{
    struct mwl8k_priv *priv = hw->priv;
    int i;

    for (i = 0 ; i < priv->num_ampdu_queues; i++) {
        struct mwl8k_ampdu_stream *stream;
        stream = &priv->ampdu[i];
        if (stream->state == AMPDU_NO_STREAM)
            continue;
        if (!memcmp(stream->sta->addr, addr, ETH_ALEN) &&
            stream->tid == tid)
            return stream;
    }
    return NULL;
}

#define MWL8K_AMPDU_PACKET_THRESHOLD 64
static inline bool mwl8k_ampdu_allowed(struct ieee80211_sta *sta, u8 tid)
{
    struct mwl8k_sta *sta_info = MWL8K_STA(sta);
    struct tx_traffic_info *tx_stats;

    BUG_ON(tid >= MWL8K_MAX_TID);
    tx_stats = &sta_info->tx_stats[tid];

    return sta_info->is_ampdu_allowed &&
        tx_stats->pkts > MWL8K_AMPDU_PACKET_THRESHOLD;
}

static inline void mwl8k_tx_count_packet(struct ieee80211_sta *sta, u8 tid)
{
    struct mwl8k_sta *sta_info = MWL8K_STA(sta);
    struct tx_traffic_info *tx_stats;

    BUG_ON(tid >= MWL8K_MAX_TID);
    tx_stats = &sta_info->tx_stats[tid];

    if (tx_stats->start_time == 0)
        tx_stats->start_time = jiffies;

    /* reset the packet count after each second elapses.  If the number of
     * packets ever exceeds the ampdu_min_traffic threshold, we will allow
     * an ampdu stream to be started.
     */
    if (jiffies - tx_stats->start_time > HZ) {
        tx_stats->pkts = 0;
        tx_stats->start_time = 0;
    } else
        tx_stats->pkts++;
}

static void
mwl8k_txq_xmit(struct ieee80211_hw *hw,
           int index,
           struct ieee80211_sta *sta,
           struct sk_buff *skb)
{
    struct mwl8k_priv *priv = hw->priv;
    struct ieee80211_tx_info *tx_info;
    struct mwl8k_vif *mwl8k_vif;
    struct ieee80211_hdr *wh;
    struct mwl8k_tx_queue *txq;
    struct mwl8k_tx_desc *tx;
    dma_addr_t dma;
    u32 txstatus;
    u8 txdatarate;
    u16 qos;
    int txpriority;
    u8 tid = 0;
    struct mwl8k_ampdu_stream *stream = NULL;
    bool start_ba_session = false;
    bool mgmtframe = false;
    struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;

    wh = (struct ieee80211_hdr *)skb->data;
    if (ieee80211_is_data_qos(wh->frame_control))
        qos = le16_to_cpu(*((__le16 *)ieee80211_get_qos_ctl(wh)));
    else
        qos = 0;

    if (ieee80211_is_mgmt(wh->frame_control))
        mgmtframe = true;

    if (priv->ap_fw)
        mwl8k_encapsulate_tx_frame(priv, skb);
    else
        mwl8k_add_dma_header(priv, skb, 0, 0);

    wh = &((struct mwl8k_dma_data *)skb->data)->wh;

    tx_info = IEEE80211_SKB_CB(skb);
    mwl8k_vif = MWL8K_VIF(tx_info->control.vif);

    if (tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
        wh->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
        wh->seq_ctrl |= cpu_to_le16(mwl8k_vif->seqno);
        mwl8k_vif->seqno += 0x10;
    }

    /* Setup firmware control bit fields for each frame type.  */
    txstatus = 0;
    txdatarate = 0;
    if (ieee80211_is_mgmt(wh->frame_control) ||
        ieee80211_is_ctl(wh->frame_control)) {
        txdatarate = 0;
        qos |= MWL8K_QOS_QLEN_UNSPEC | MWL8K_QOS_EOSP;
    } else if (ieee80211_is_data(wh->frame_control)) {
        txdatarate = 1;
        if (is_multicast_ether_addr(wh->addr1))
            txstatus |= MWL8K_TXD_STATUS_MULTICAST_TX;

        qos &= ~MWL8K_QOS_ACK_POLICY_MASK;
        if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
            qos |= MWL8K_QOS_ACK_POLICY_BLOCKACK;
        else
            qos |= MWL8K_QOS_ACK_POLICY_NORMAL;
    }

    /* Queue ADDBA request in the respective data queue.  While setting up
     * the ampdu stream, mac80211 queues further packets for that
     * particular ra/tid pair.  However, packets piled up in the hardware
     * for that ra/tid pair will still go out. ADDBA request and the
     * related data packets going out from different queues asynchronously
     * will cause a shift in the receiver window which might result in
     * ampdu packets getting dropped at the receiver after the stream has
     * been setup.
     */
    if (unlikely(ieee80211_is_action(wh->frame_control) &&
        mgmt->u.action.category == WLAN_CATEGORY_BACK &&
        mgmt->u.action.u.addba_req.action_code == WLAN_ACTION_ADDBA_REQ &&
        priv->ap_fw)) {
        u16 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
        tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
        index = mwl8k_tid_queue_mapping(tid);
    }

    txpriority = index;

    if (priv->ap_fw && sta && sta->ht_cap.ht_supported
            && skb->protocol != cpu_to_be16(ETH_P_PAE)
            && ieee80211_is_data_qos(wh->frame_control)) {
        tid = qos & 0xf;
        mwl8k_tx_count_packet(sta, tid);
        spin_lock(&priv->stream_lock);
        stream = mwl8k_lookup_stream(hw, sta->addr, tid);
        if (stream != NULL) {
            if (stream->state == AMPDU_STREAM_ACTIVE) {
                txpriority = stream->txq_idx;
                index = stream->txq_idx;
            } else if (stream->state == AMPDU_STREAM_NEW) {
                /* We get here if the driver sends us packets
                 * after we've initiated a stream, but before
                 * our ampdu_action routine has been called
                 * with IEEE80211_AMPDU_TX_START to get the SSN
                 * for the ADDBA request.  So this packet can
                 * go out with no risk of sequence number
                 * mismatch.  No special handling is required.
                 */
            } else {
                /* Drop packets that would go out after the
                 * ADDBA request was sent but before the ADDBA
                 * response is received.  If we don't do this,
                 * the recipient would probably receive it
                 * after the ADDBA request with SSN 0.  This
                 * will cause the recipient's BA receive window
                 * to shift, which would cause the subsequent
                 * packets in the BA stream to be discarded.
                 * mac80211 queues our packets for us in this
                 * case, so this is really just a safety check.
                 */
                wiphy_warn(hw->wiphy,
                       "Cannot send packet while ADDBA "
                       "dialog is underway.\n");
                spin_unlock(&priv->stream_lock);
                dev_kfree_skb(skb);
                return;
            }
        } else {
            /* Defer calling mwl8k_start_stream so that the current
             * skb can go out before the ADDBA request.  This
             * prevents sequence number mismatch at the recepient
             * as described above.
             */
            if (mwl8k_ampdu_allowed(sta, tid)) {
                stream = mwl8k_add_stream(hw, sta, tid);
                if (stream != NULL)
                    start_ba_session = true;
            }
        }
        spin_unlock(&priv->stream_lock);
    }

    dma = pci_map_single(priv->pdev, skb->data,
                skb->len, PCI_DMA_TODEVICE);

    if (pci_dma_mapping_error(priv->pdev, dma)) {
        wiphy_debug(hw->wiphy,
                "failed to dma map skb, dropping TX frame.\n");
        if (start_ba_session) {
            spin_lock(&priv->stream_lock);
            mwl8k_remove_stream(hw, stream);
            spin_unlock(&priv->stream_lock);
        }
        dev_kfree_skb(skb);
        return;
    }

    spin_lock_bh(&priv->tx_lock);

    txq = priv->txq + index;

    /* Mgmt frames that go out frequently are probe
     * responses. Other mgmt frames got out relatively
     * infrequently. Hence reserve 2 buffers so that
     * other mgmt frames do not get dropped due to an
     * already queued probe response in one of the
     * reserved buffers.
     */

    if (txq->len >= MWL8K_TX_DESCS - 2) {
        if (!mgmtframe || txq->len == MWL8K_TX_DESCS) {
            if (start_ba_session) {
                spin_lock(&priv->stream_lock);
                mwl8k_remove_stream(hw, stream);
                spin_unlock(&priv->stream_lock);
            }
            spin_unlock_bh(&priv->tx_lock);
            dev_kfree_skb(skb);
            return;
        }
    }

    BUG_ON(txq->skb[txq->tail] != NULL);
    txq->skb[txq->tail] = skb;

    tx = txq->txd + txq->tail;
    tx->data_rate = txdatarate;
    tx->tx_priority = txpriority;
    tx->qos_control = cpu_to_le16(qos);
    tx->pkt_phys_addr = cpu_to_le32(dma);
    tx->pkt_len = cpu_to_le16(skb->len);
    tx->rate_info = 0;
    if (!priv->ap_fw && sta != NULL)
        tx->peer_id = MWL8K_STA(sta)->peer_id;
    else
        tx->peer_id = 0;

    if (priv->ap_fw)
        tx->timestamp = cpu_to_le32(ioread32(priv->regs +
                        MWL8K_HW_TIMER_REGISTER));

    wmb();
    tx->status = cpu_to_le32(MWL8K_TXD_STATUS_FW_OWNED | txstatus);

    txq->len++;
    priv->pending_tx_pkts++;

    txq->tail++;
    if (txq->tail == MWL8K_TX_DESCS)
        txq->tail = 0;

    mwl8k_tx_start(priv);

    spin_unlock_bh(&priv->tx_lock);

    /* Initiate the ampdu session here */
    if (start_ba_session) {
        spin_lock(&priv->stream_lock);
        if (mwl8k_start_stream(hw, stream))
            mwl8k_remove_stream(hw, stream);
        spin_unlock(&priv->stream_lock);
    }
}


/*
 * Firmware access.
 *
 * We have the following requirements for issuing firmware commands:
 * - Some commands require that the packet transmit path is idle when
 *   the command is issued.  (For simplicity, we'll just quiesce the
 *   transmit path for every command.)
 * - There are certain sequences of commands that need to be issued to
 *   the hardware sequentially, with no other intervening commands.
 *
 * This leads to an implementation of a "firmware lock" as a mutex that
 * can be taken recursively, and which is taken by both the low-level
 * command submission function (mwl8k_post_cmd) as well as any users of
 * that function that require issuing of an atomic sequence of commands,
 * and quiesces the transmit path whenever it's taken.
 */
static int mwl8k_fw_lock(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;

    if (priv->fw_mutex_owner != current) {
        int rc;

        mutex_lock(&priv->fw_mutex);
        ieee80211_stop_queues(hw);

        rc = mwl8k_tx_wait_empty(hw);
        if (rc) {
            if (!priv->hw_restart_in_progress)
                ieee80211_wake_queues(hw);

            mutex_unlock(&priv->fw_mutex);

            return rc;
        }

        priv->fw_mutex_owner = current;
    }

    priv->fw_mutex_depth++;

    return 0;
}

static void mwl8k_fw_unlock(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;

    if (!--priv->fw_mutex_depth) {
        if (!priv->hw_restart_in_progress)
            ieee80211_wake_queues(hw);

        priv->fw_mutex_owner = NULL;
        mutex_unlock(&priv->fw_mutex);
    }
}


/*
 * Command processing.
 */

/* Timeout firmware commands after 10s */
#define MWL8K_CMD_TIMEOUT_MS    10000

static int mwl8k_post_cmd(struct ieee80211_hw *hw, struct mwl8k_cmd_pkt *cmd)
{
    DECLARE_COMPLETION_ONSTACK(cmd_wait);
    struct mwl8k_priv *priv = hw->priv;
    void __iomem *regs = priv->regs;
    dma_addr_t dma_addr;
    unsigned int dma_size;
    int rc;
    unsigned long timeout = 0;
    u8 buf[32];

    cmd->result = (__force __le16) 0xffff;
    dma_size = le16_to_cpu(cmd->length);
    dma_addr = pci_map_single(priv->pdev, cmd, dma_size,
                  PCI_DMA_BIDIRECTIONAL);
    if (pci_dma_mapping_error(priv->pdev, dma_addr))
        return -ENOMEM;

    rc = mwl8k_fw_lock(hw);
    if (rc) {
        pci_unmap_single(priv->pdev, dma_addr, dma_size,
                        PCI_DMA_BIDIRECTIONAL);
        return rc;
    }

    priv->hostcmd_wait = &cmd_wait;
    iowrite32(dma_addr, regs + MWL8K_HIU_GEN_PTR);
    iowrite32(MWL8K_H2A_INT_DOORBELL,
        regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
    iowrite32(MWL8K_H2A_INT_DUMMY,
        regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);

    timeout = wait_for_completion_timeout(&cmd_wait,
                msecs_to_jiffies(MWL8K_CMD_TIMEOUT_MS));

    priv->hostcmd_wait = NULL;

    mwl8k_fw_unlock(hw);

    pci_unmap_single(priv->pdev, dma_addr, dma_size,
                    PCI_DMA_BIDIRECTIONAL);

    if (!timeout) {
        wiphy_err(hw->wiphy, "Command %s timeout after %u ms\n",
              mwl8k_cmd_name(cmd->code, buf, sizeof(buf)),
              MWL8K_CMD_TIMEOUT_MS);
        rc = -ETIMEDOUT;
    } else {
        int ms;

        ms = MWL8K_CMD_TIMEOUT_MS - jiffies_to_msecs(timeout);

        rc = cmd->result ? -EINVAL : 0;
        if (rc)
            wiphy_err(hw->wiphy, "Command %s error 0x%x\n",
                  mwl8k_cmd_name(cmd->code, buf, sizeof(buf)),
                  le16_to_cpu(cmd->result));
        else if (ms > 2000)
            wiphy_notice(hw->wiphy, "Command %s took %d ms\n",
                     mwl8k_cmd_name(cmd->code,
                            buf, sizeof(buf)),
                     ms);
    }

    return rc;
}

static int mwl8k_post_pervif_cmd(struct ieee80211_hw *hw,
                 struct ieee80211_vif *vif,
                 struct mwl8k_cmd_pkt *cmd)
{
    if (vif != NULL)
        cmd->macid = MWL8K_VIF(vif)->macid;
    return mwl8k_post_cmd(hw, cmd);
}

/*
 * Setup code shared between STA and AP firmware images.
 */
static void mwl8k_setup_2ghz_band(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;

    BUILD_BUG_ON(sizeof(priv->channels_24) != sizeof(mwl8k_channels_24));
    memcpy(priv->channels_24, mwl8k_channels_24, sizeof(mwl8k_channels_24));

    BUILD_BUG_ON(sizeof(priv->rates_24) != sizeof(mwl8k_rates_24));
    memcpy(priv->rates_24, mwl8k_rates_24, sizeof(mwl8k_rates_24));

    priv->band_24.band = IEEE80211_BAND_2GHZ;
    priv->band_24.channels = priv->channels_24;
    priv->band_24.n_channels = ARRAY_SIZE(mwl8k_channels_24);
    priv->band_24.bitrates = priv->rates_24;
    priv->band_24.n_bitrates = ARRAY_SIZE(mwl8k_rates_24);

    hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &priv->band_24;
}

static void mwl8k_setup_5ghz_band(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;

    BUILD_BUG_ON(sizeof(priv->channels_50) != sizeof(mwl8k_channels_50));
    memcpy(priv->channels_50, mwl8k_channels_50, sizeof(mwl8k_channels_50));

    BUILD_BUG_ON(sizeof(priv->rates_50) != sizeof(mwl8k_rates_50));
    memcpy(priv->rates_50, mwl8k_rates_50, sizeof(mwl8k_rates_50));

    priv->band_50.band = IEEE80211_BAND_5GHZ;
    priv->band_50.channels = priv->channels_50;
    priv->band_50.n_channels = ARRAY_SIZE(mwl8k_channels_50);
    priv->band_50.bitrates = priv->rates_50;
    priv->band_50.n_bitrates = ARRAY_SIZE(mwl8k_rates_50);

    hw->wiphy->bands[IEEE80211_BAND_5GHZ] = &priv->band_50;
}

/*
 * CMD_GET_HW_SPEC (STA version).
 */
struct mwl8k_cmd_get_hw_spec_sta {
    struct mwl8k_cmd_pkt header;
    __u8 hw_rev;
    __u8 host_interface;
    __le16 num_mcaddrs;
    __u8 perm_addr[ETH_ALEN];
    __le16 region_code;
    __le32 fw_rev;
    __le32 ps_cookie;
    __le32 caps;
    __u8 mcs_bitmap[16];
    __le32 rx_queue_ptr;
    __le32 num_tx_queues;
    __le32 tx_queue_ptrs[MWL8K_TX_WMM_QUEUES];
    __le32 caps2;
    __le32 num_tx_desc_per_queue;
    __le32 total_rxd;
} __packed;

#define MWL8K_CAP_MAX_AMSDU     0x20000000
#define MWL8K_CAP_GREENFIELD        0x08000000
#define MWL8K_CAP_AMPDU         0x04000000
#define MWL8K_CAP_RX_STBC       0x01000000
#define MWL8K_CAP_TX_STBC       0x00800000
#define MWL8K_CAP_SHORTGI_40MHZ     0x00400000
#define MWL8K_CAP_SHORTGI_20MHZ     0x00200000
#define MWL8K_CAP_RX_ANTENNA_MASK   0x000e0000
#define MWL8K_CAP_TX_ANTENNA_MASK   0x0001c000
#define MWL8K_CAP_DELAY_BA      0x00003000
#define MWL8K_CAP_MIMO          0x00000200
#define MWL8K_CAP_40MHZ         0x00000100
#define MWL8K_CAP_BAND_MASK     0x00000007
#define MWL8K_CAP_5GHZ          0x00000004
#define MWL8K_CAP_2GHZ4         0x00000001

static void
mwl8k_set_ht_caps(struct ieee80211_hw *hw,
          struct ieee80211_supported_band *band, u32 cap)
{
    int rx_streams;
    int tx_streams;

    band->ht_cap.ht_supported = 1;

    if (cap & MWL8K_CAP_MAX_AMSDU)
        band->ht_cap.cap |= IEEE80211_HT_CAP_MAX_AMSDU;
    if (cap & MWL8K_CAP_GREENFIELD)
        band->ht_cap.cap |= IEEE80211_HT_CAP_GRN_FLD;
    if (cap & MWL8K_CAP_AMPDU) {
        hw->flags |= IEEE80211_HW_AMPDU_AGGREGATION;
        band->ht_cap.ampdu_factor = IEEE80211_HT_MAX_AMPDU_64K;
        band->ht_cap.ampdu_density = IEEE80211_HT_MPDU_DENSITY_NONE;
    }
    if (cap & MWL8K_CAP_RX_STBC)
        band->ht_cap.cap |= IEEE80211_HT_CAP_RX_STBC;
    if (cap & MWL8K_CAP_TX_STBC)
        band->ht_cap.cap |= IEEE80211_HT_CAP_TX_STBC;
    if (cap & MWL8K_CAP_SHORTGI_40MHZ)
        band->ht_cap.cap |= IEEE80211_HT_CAP_SGI_40;
    if (cap & MWL8K_CAP_SHORTGI_20MHZ)
        band->ht_cap.cap |= IEEE80211_HT_CAP_SGI_20;
    if (cap & MWL8K_CAP_DELAY_BA)
        band->ht_cap.cap |= IEEE80211_HT_CAP_DELAY_BA;
    if (cap & MWL8K_CAP_40MHZ)
        band->ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;

    rx_streams = hweight32(cap & MWL8K_CAP_RX_ANTENNA_MASK);
    tx_streams = hweight32(cap & MWL8K_CAP_TX_ANTENNA_MASK);

    band->ht_cap.mcs.rx_mask[0] = 0xff;
    if (rx_streams >= 2)
        band->ht_cap.mcs.rx_mask[1] = 0xff;
    if (rx_streams >= 3)
        band->ht_cap.mcs.rx_mask[2] = 0xff;
    band->ht_cap.mcs.rx_mask[4] = 0x01;
    band->ht_cap.mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;

    if (rx_streams != tx_streams) {
        band->ht_cap.mcs.tx_params |= IEEE80211_HT_MCS_TX_RX_DIFF;
        band->ht_cap.mcs.tx_params |= (tx_streams - 1) <<
                IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
    }
}

static void
mwl8k_set_caps(struct ieee80211_hw *hw, u32 caps)
{
    struct mwl8k_priv *priv = hw->priv;

    if ((caps & MWL8K_CAP_2GHZ4) || !(caps & MWL8K_CAP_BAND_MASK)) {
        mwl8k_setup_2ghz_band(hw);
        if (caps & MWL8K_CAP_MIMO)
            mwl8k_set_ht_caps(hw, &priv->band_24, caps);
    }

    if (caps & MWL8K_CAP_5GHZ) {
        mwl8k_setup_5ghz_band(hw);
        if (caps & MWL8K_CAP_MIMO)
            mwl8k_set_ht_caps(hw, &priv->band_50, caps);
    }
}

static int mwl8k_cmd_get_hw_spec_sta(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_cmd_get_hw_spec_sta *cmd;
    int rc;
    int i;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_GET_HW_SPEC);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));

    memset(cmd->perm_addr, 0xff, sizeof(cmd->perm_addr));
    cmd->ps_cookie = cpu_to_le32(priv->cookie_dma);
    cmd->rx_queue_ptr = cpu_to_le32(priv->rxq[0].rxd_dma);
    cmd->num_tx_queues = cpu_to_le32(mwl8k_tx_queues(priv));
    for (i = 0; i < mwl8k_tx_queues(priv); i++)
        cmd->tx_queue_ptrs[i] = cpu_to_le32(priv->txq[i].txd_dma);
    cmd->num_tx_desc_per_queue = cpu_to_le32(MWL8K_TX_DESCS);
    cmd->total_rxd = cpu_to_le32(MWL8K_RX_DESCS);

    rc = mwl8k_post_cmd(hw, &cmd->header);

    if (!rc) {
        SET_IEEE80211_PERM_ADDR(hw, cmd->perm_addr);
        priv->num_mcaddrs = le16_to_cpu(cmd->num_mcaddrs);
        priv->fw_rev = le32_to_cpu(cmd->fw_rev);
        priv->hw_rev = cmd->hw_rev;
        mwl8k_set_caps(hw, le32_to_cpu(cmd->caps));
        priv->ap_macids_supported = 0x00000000;
        priv->sta_macids_supported = 0x00000001;
    }

    kfree(cmd);
    return rc;
}

/*
 * CMD_GET_HW_SPEC (AP version).
 */
struct mwl8k_cmd_get_hw_spec_ap {
    struct mwl8k_cmd_pkt header;
    __u8 hw_rev;
    __u8 host_interface;
    __le16 num_wcb;
    __le16 num_mcaddrs;
    __u8 perm_addr[ETH_ALEN];
    __le16 region_code;
    __le16 num_antenna;
    __le32 fw_rev;
    __le32 wcbbase0;
    __le32 rxwrptr;
    __le32 rxrdptr;
    __le32 ps_cookie;
    __le32 wcbbase1;
    __le32 wcbbase2;
    __le32 wcbbase3;
    __le32 fw_api_version;
    __le32 caps;
    __le32 num_of_ampdu_queues;
    __le32 wcbbase_ampdu[MWL8K_MAX_AMPDU_QUEUES];
} __packed;

static int mwl8k_cmd_get_hw_spec_ap(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_cmd_get_hw_spec_ap *cmd;
    int rc, i;
    u32 api_version;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_GET_HW_SPEC);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));

    memset(cmd->perm_addr, 0xff, sizeof(cmd->perm_addr));
    cmd->ps_cookie = cpu_to_le32(priv->cookie_dma);

    rc = mwl8k_post_cmd(hw, &cmd->header);

    if (!rc) {
        int off;

        api_version = le32_to_cpu(cmd->fw_api_version);
        if (priv->device_info->fw_api_ap != api_version) {
            printk(KERN_ERR "%s: Unsupported fw API version for %s."
                   "  Expected %d got %d.\n", MWL8K_NAME,
                   priv->device_info->part_name,
                   priv->device_info->fw_api_ap,
                   api_version);
            rc = -EINVAL;
            goto done;
        }
        SET_IEEE80211_PERM_ADDR(hw, cmd->perm_addr);
        priv->num_mcaddrs = le16_to_cpu(cmd->num_mcaddrs);
        priv->fw_rev = le32_to_cpu(cmd->fw_rev);
        priv->hw_rev = cmd->hw_rev;
        mwl8k_set_caps(hw, le32_to_cpu(cmd->caps));
        priv->ap_macids_supported = 0x000000ff;
        priv->sta_macids_supported = 0x00000000;
        priv->num_ampdu_queues = le32_to_cpu(cmd->num_of_ampdu_queues);
        if (priv->num_ampdu_queues > MWL8K_MAX_AMPDU_QUEUES) {
            wiphy_warn(hw->wiphy, "fw reported %d ampdu queues"
                   " but we only support %d.\n",
                   priv->num_ampdu_queues,
                   MWL8K_MAX_AMPDU_QUEUES);
            priv->num_ampdu_queues = MWL8K_MAX_AMPDU_QUEUES;
        }
        off = le32_to_cpu(cmd->rxwrptr) & 0xffff;
        iowrite32(priv->rxq[0].rxd_dma, priv->sram + off);

        off = le32_to_cpu(cmd->rxrdptr) & 0xffff;
        iowrite32(priv->rxq[0].rxd_dma, priv->sram + off);

        priv->txq_offset[0] = le32_to_cpu(cmd->wcbbase0) & 0xffff;
        priv->txq_offset[1] = le32_to_cpu(cmd->wcbbase1) & 0xffff;
        priv->txq_offset[2] = le32_to_cpu(cmd->wcbbase2) & 0xffff;
        priv->txq_offset[3] = le32_to_cpu(cmd->wcbbase3) & 0xffff;

        for (i = 0; i < priv->num_ampdu_queues; i++)
            priv->txq_offset[i + MWL8K_TX_WMM_QUEUES] =
                le32_to_cpu(cmd->wcbbase_ampdu[i]) & 0xffff;
    }

done:
    kfree(cmd);
    return rc;
}

/*
 * CMD_SET_HW_SPEC.
 */
struct mwl8k_cmd_set_hw_spec {
    struct mwl8k_cmd_pkt header;
    __u8 hw_rev;
    __u8 host_interface;
    __le16 num_mcaddrs;
    __u8 perm_addr[ETH_ALEN];
    __le16 region_code;
    __le32 fw_rev;
    __le32 ps_cookie;
    __le32 caps;
    __le32 rx_queue_ptr;
    __le32 num_tx_queues;
    __le32 tx_queue_ptrs[MWL8K_MAX_TX_QUEUES];
    __le32 flags;
    __le32 num_tx_desc_per_queue;
    __le32 total_rxd;
} __packed;

/* If enabled, MWL8K_SET_HW_SPEC_FLAG_ENABLE_LIFE_TIME_EXPIRY will cause
 * packets to expire 500 ms after the timestamp in the tx descriptor.  That is,
 * the packets that are queued for more than 500ms, will be dropped in the
 * hardware. This helps minimizing the issues caused due to head-of-line
 * blocking where a slow client can hog the bandwidth and affect traffic to a
 * faster client.
 */
#define MWL8K_SET_HW_SPEC_FLAG_ENABLE_LIFE_TIME_EXPIRY  0x00000400
#define MWL8K_SET_HW_SPEC_FLAG_GENERATE_CCMP_HDR    0x00000200
#define MWL8K_SET_HW_SPEC_FLAG_HOST_DECR_MGMT       0x00000080
#define MWL8K_SET_HW_SPEC_FLAG_HOSTFORM_PROBERESP   0x00000020
#define MWL8K_SET_HW_SPEC_FLAG_HOSTFORM_BEACON      0x00000010

static int mwl8k_cmd_set_hw_spec(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_cmd_set_hw_spec *cmd;
    int rc;
    int i;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_HW_SPEC);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));

    cmd->ps_cookie = cpu_to_le32(priv->cookie_dma);
    cmd->rx_queue_ptr = cpu_to_le32(priv->rxq[0].rxd_dma);
    cmd->num_tx_queues = cpu_to_le32(mwl8k_tx_queues(priv));

    /*
     * Mac80211 stack has Q0 as highest priority and Q3 as lowest in
     * that order. Firmware has Q3 as highest priority and Q0 as lowest
     * in that order. Map Q3 of mac80211 to Q0 of firmware so that the
     * priority is interpreted the right way in firmware.
     */
    for (i = 0; i < mwl8k_tx_queues(priv); i++) {
        int j = mwl8k_tx_queues(priv) - 1 - i;
        cmd->tx_queue_ptrs[i] = cpu_to_le32(priv->txq[j].txd_dma);
    }

    cmd->flags = cpu_to_le32(MWL8K_SET_HW_SPEC_FLAG_HOST_DECR_MGMT |
                 MWL8K_SET_HW_SPEC_FLAG_HOSTFORM_PROBERESP |
                 MWL8K_SET_HW_SPEC_FLAG_HOSTFORM_BEACON |
                 MWL8K_SET_HW_SPEC_FLAG_ENABLE_LIFE_TIME_EXPIRY |
                 MWL8K_SET_HW_SPEC_FLAG_GENERATE_CCMP_HDR);
    cmd->num_tx_desc_per_queue = cpu_to_le32(MWL8K_TX_DESCS);
    cmd->total_rxd = cpu_to_le32(MWL8K_RX_DESCS);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_MAC_MULTICAST_ADR.
 */
struct mwl8k_cmd_mac_multicast_adr {
    struct mwl8k_cmd_pkt header;
    __le16 action;
    __le16 numaddr;
    __u8 addr[0][ETH_ALEN];
};

#define MWL8K_ENABLE_RX_DIRECTED    0x0001
#define MWL8K_ENABLE_RX_MULTICAST   0x0002
#define MWL8K_ENABLE_RX_ALL_MULTICAST   0x0004
#define MWL8K_ENABLE_RX_BROADCAST   0x0008

static struct mwl8k_cmd_pkt *
__mwl8k_cmd_mac_multicast_adr(struct ieee80211_hw *hw, int allmulti,
                  struct netdev_hw_addr_list *mc_list)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_cmd_mac_multicast_adr *cmd;
    int size;
    int mc_count = 0;

    if (mc_list)
        mc_count = netdev_hw_addr_list_count(mc_list);

    if (allmulti || mc_count > priv->num_mcaddrs) {
        allmulti = 1;
        mc_count = 0;
    }

    size = sizeof(*cmd) + mc_count * ETH_ALEN;

    cmd = kzalloc(size, GFP_ATOMIC);
    if (cmd == NULL)
        return NULL;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_MAC_MULTICAST_ADR);
    cmd->header.length = cpu_to_le16(size);
    cmd->action = cpu_to_le16(MWL8K_ENABLE_RX_DIRECTED |
                  MWL8K_ENABLE_RX_BROADCAST);

    if (allmulti) {
        cmd->action |= cpu_to_le16(MWL8K_ENABLE_RX_ALL_MULTICAST);
    } else if (mc_count) {
        struct netdev_hw_addr *ha;
        int i = 0;

        cmd->action |= cpu_to_le16(MWL8K_ENABLE_RX_MULTICAST);
        cmd->numaddr = cpu_to_le16(mc_count);
        netdev_hw_addr_list_for_each(ha, mc_list) {
            memcpy(cmd->addr[i], ha->addr, ETH_ALEN);
        }
    }

    return &cmd->header;
}

/*
 * CMD_GET_STAT.
 */
struct mwl8k_cmd_get_stat {
    struct mwl8k_cmd_pkt header;
    __le32 stats[64];
} __packed;

#define MWL8K_STAT_ACK_FAILURE  9
#define MWL8K_STAT_RTS_FAILURE  12
#define MWL8K_STAT_FCS_ERROR    24
#define MWL8K_STAT_RTS_SUCCESS  11

static int mwl8k_cmd_get_stat(struct ieee80211_hw *hw,
                  struct ieee80211_low_level_stats *stats)
{
    struct mwl8k_cmd_get_stat *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_GET_STAT);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));

    rc = mwl8k_post_cmd(hw, &cmd->header);
    if (!rc) {
        stats->dot11ACKFailureCount =
            le32_to_cpu(cmd->stats[MWL8K_STAT_ACK_FAILURE]);
        stats->dot11RTSFailureCount =
            le32_to_cpu(cmd->stats[MWL8K_STAT_RTS_FAILURE]);
        stats->dot11FCSErrorCount =
            le32_to_cpu(cmd->stats[MWL8K_STAT_FCS_ERROR]);
        stats->dot11RTSSuccessCount =
            le32_to_cpu(cmd->stats[MWL8K_STAT_RTS_SUCCESS]);
    }
    kfree(cmd);

    return rc;
}

/*
 * CMD_RADIO_CONTROL.
 */
struct mwl8k_cmd_radio_control {
    struct mwl8k_cmd_pkt header;
    __le16 action;
    __le16 control;
    __le16 radio_on;
} __packed;

static int
mwl8k_cmd_radio_control(struct ieee80211_hw *hw, bool enable, bool force)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_cmd_radio_control *cmd;
    int rc;

    if (enable == priv->radio_on && !force)
        return 0;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_RADIO_CONTROL);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le16(MWL8K_CMD_SET);
    cmd->control = cpu_to_le16(priv->radio_short_preamble ? 3 : 1);
    cmd->radio_on = cpu_to_le16(enable ? 0x0001 : 0x0000);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    if (!rc)
        priv->radio_on = enable;

    return rc;
}

static int mwl8k_cmd_radio_disable(struct ieee80211_hw *hw)
{
    return mwl8k_cmd_radio_control(hw, 0, 0);
}

static int mwl8k_cmd_radio_enable(struct ieee80211_hw *hw)
{
    return mwl8k_cmd_radio_control(hw, 1, 0);
}

static int
mwl8k_set_radio_preamble(struct ieee80211_hw *hw, bool short_preamble)
{
    struct mwl8k_priv *priv = hw->priv;

    priv->radio_short_preamble = short_preamble;

    return mwl8k_cmd_radio_control(hw, 1, 1);
}

/*
 * CMD_RF_TX_POWER.
 */
#define MWL8K_RF_TX_POWER_LEVEL_TOTAL   8

struct mwl8k_cmd_rf_tx_power {
    struct mwl8k_cmd_pkt header;
    __le16 action;
    __le16 support_level;
    __le16 current_level;
    __le16 reserved;
    __le16 power_level_list[MWL8K_RF_TX_POWER_LEVEL_TOTAL];
} __packed;

static int mwl8k_cmd_rf_tx_power(struct ieee80211_hw *hw, int dBm)
{
    struct mwl8k_cmd_rf_tx_power *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_RF_TX_POWER);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le16(MWL8K_CMD_SET);
    cmd->support_level = cpu_to_le16(dBm);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_TX_POWER.
 */
#define MWL8K_TX_POWER_LEVEL_TOTAL      12

struct mwl8k_cmd_tx_power {
    struct mwl8k_cmd_pkt header;
    __le16 action;
    __le16 band;
    __le16 channel;
    __le16 bw;
    __le16 sub_ch;
    __le16 power_level_list[MWL8K_TX_POWER_LEVEL_TOTAL];
} __packed;

static int mwl8k_cmd_tx_power(struct ieee80211_hw *hw,
                     struct ieee80211_conf *conf,
                     unsigned short pwr)
{
    struct ieee80211_channel *channel = conf->channel;
    struct mwl8k_cmd_tx_power *cmd;
    int rc;
    int i;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_TX_POWER);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le16(MWL8K_CMD_SET_LIST);

    if (channel->band == IEEE80211_BAND_2GHZ)
        cmd->band = cpu_to_le16(0x1);
    else if (channel->band == IEEE80211_BAND_5GHZ)
        cmd->band = cpu_to_le16(0x4);

    cmd->channel = cpu_to_le16(channel->hw_value);

    if (conf->channel_type == NL80211_CHAN_NO_HT ||
        conf->channel_type == NL80211_CHAN_HT20) {
        cmd->bw = cpu_to_le16(0x2);
    } else {
        cmd->bw = cpu_to_le16(0x4);
        if (conf->channel_type == NL80211_CHAN_HT40MINUS)
            cmd->sub_ch = cpu_to_le16(0x3);
        else if (conf->channel_type == NL80211_CHAN_HT40PLUS)
            cmd->sub_ch = cpu_to_le16(0x1);
    }

    for (i = 0; i < MWL8K_TX_POWER_LEVEL_TOTAL; i++)
        cmd->power_level_list[i] = cpu_to_le16(pwr);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_RF_ANTENNA.
 */
struct mwl8k_cmd_rf_antenna {
    struct mwl8k_cmd_pkt header;
    __le16 antenna;
    __le16 mode;
} __packed;

#define MWL8K_RF_ANTENNA_RX     1
#define MWL8K_RF_ANTENNA_TX     2

static int
mwl8k_cmd_rf_antenna(struct ieee80211_hw *hw, int antenna, int mask)
{
    struct mwl8k_cmd_rf_antenna *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_RF_ANTENNA);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->antenna = cpu_to_le16(antenna);
    cmd->mode = cpu_to_le16(mask);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_SET_BEACON.
 */
struct mwl8k_cmd_set_beacon {
    struct mwl8k_cmd_pkt header;
    __le16 beacon_len;
    __u8 beacon[0];
};

static int mwl8k_cmd_set_beacon(struct ieee80211_hw *hw,
                struct ieee80211_vif *vif, u8 *beacon, int len)
{
    struct mwl8k_cmd_set_beacon *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd) + len, GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_BEACON);
    cmd->header.length = cpu_to_le16(sizeof(*cmd) + len);
    cmd->beacon_len = cpu_to_le16(len);
    memcpy(cmd->beacon, beacon, len);

    rc = mwl8k_post_pervif_cmd(hw, vif, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_SET_PRE_SCAN.
 */
struct mwl8k_cmd_set_pre_scan {
    struct mwl8k_cmd_pkt header;
} __packed;

static int mwl8k_cmd_set_pre_scan(struct ieee80211_hw *hw)
{
    struct mwl8k_cmd_set_pre_scan *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_PRE_SCAN);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_SET_POST_SCAN.
 */
struct mwl8k_cmd_set_post_scan {
    struct mwl8k_cmd_pkt header;
    __le32 isibss;
    __u8 bssid[ETH_ALEN];
} __packed;

static int
mwl8k_cmd_set_post_scan(struct ieee80211_hw *hw, const __u8 *mac)
{
    struct mwl8k_cmd_set_post_scan *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_POST_SCAN);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->isibss = 0;
    memcpy(cmd->bssid, mac, ETH_ALEN);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_SET_RF_CHANNEL.
 */
struct mwl8k_cmd_set_rf_channel {
    struct mwl8k_cmd_pkt header;
    __le16 action;
    __u8 current_channel;
    __le32 channel_flags;
} __packed;

static int mwl8k_cmd_set_rf_channel(struct ieee80211_hw *hw,
                    struct ieee80211_conf *conf)
{
    struct ieee80211_channel *channel = conf->channel;
    struct mwl8k_cmd_set_rf_channel *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_RF_CHANNEL);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le16(MWL8K_CMD_SET);
    cmd->current_channel = channel->hw_value;

    if (channel->band == IEEE80211_BAND_2GHZ)
        cmd->channel_flags |= cpu_to_le32(0x00000001);
    else if (channel->band == IEEE80211_BAND_5GHZ)
        cmd->channel_flags |= cpu_to_le32(0x00000004);

    if (conf->channel_type == NL80211_CHAN_NO_HT ||
        conf->channel_type == NL80211_CHAN_HT20)
        cmd->channel_flags |= cpu_to_le32(0x00000080);
    else if (conf->channel_type == NL80211_CHAN_HT40MINUS)
        cmd->channel_flags |= cpu_to_le32(0x000001900);
    else if (conf->channel_type == NL80211_CHAN_HT40PLUS)
        cmd->channel_flags |= cpu_to_le32(0x000000900);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_SET_AID.
 */
#define MWL8K_FRAME_PROT_DISABLED           0x00
#define MWL8K_FRAME_PROT_11G                0x07
#define MWL8K_FRAME_PROT_11N_HT_40MHZ_ONLY      0x02
#define MWL8K_FRAME_PROT_11N_HT_ALL         0x06

struct mwl8k_cmd_update_set_aid {
    struct  mwl8k_cmd_pkt header;
    __le16  aid;

     /* AP's MAC address (BSSID) */
    __u8    bssid[ETH_ALEN];
    __le16  protection_mode;
    __u8    supp_rates[14];
} __packed;

static void legacy_rate_mask_to_array(u8 *rates, u32 mask)
{
    int i;
    int j;

    /*
     * Clear nonstandard rates 4 and 13.
     */
    mask &= 0x1fef;

    for (i = 0, j = 0; i < 14; i++) {
        if (mask & (1 << i))
            rates[j++] = mwl8k_rates_24[i].hw_value;
    }
}

static int
mwl8k_cmd_set_aid(struct ieee80211_hw *hw,
          struct ieee80211_vif *vif, u32 legacy_rate_mask)
{
    struct mwl8k_cmd_update_set_aid *cmd;
    u16 prot_mode;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_AID);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->aid = cpu_to_le16(vif->bss_conf.aid);
    memcpy(cmd->bssid, vif->bss_conf.bssid, ETH_ALEN);

    if (vif->bss_conf.use_cts_prot) {
        prot_mode = MWL8K_FRAME_PROT_11G;
    } else {
        switch (vif->bss_conf.ht_operation_mode &
            IEEE80211_HT_OP_MODE_PROTECTION) {
        case IEEE80211_HT_OP_MODE_PROTECTION_20MHZ:
            prot_mode = MWL8K_FRAME_PROT_11N_HT_40MHZ_ONLY;
            break;
        case IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED:
            prot_mode = MWL8K_FRAME_PROT_11N_HT_ALL;
            break;
        default:
            prot_mode = MWL8K_FRAME_PROT_DISABLED;
            break;
        }
    }
    cmd->protection_mode = cpu_to_le16(prot_mode);

    legacy_rate_mask_to_array(cmd->supp_rates, legacy_rate_mask);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_SET_RATE.
 */
struct mwl8k_cmd_set_rate {
    struct  mwl8k_cmd_pkt header;
    __u8    legacy_rates[14];

    /* Bitmap for supported MCS codes.  */
    __u8    mcs_set[16];
    __u8    reserved[16];
} __packed;

static int
mwl8k_cmd_set_rate(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
           u32 legacy_rate_mask, u8 *mcs_rates)
{
    struct mwl8k_cmd_set_rate *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_RATE);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    legacy_rate_mask_to_array(cmd->legacy_rates, legacy_rate_mask);
    memcpy(cmd->mcs_set, mcs_rates, 16);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_FINALIZE_JOIN.
 */
#define MWL8K_FJ_BEACON_MAXLEN  128

struct mwl8k_cmd_finalize_join {
    struct mwl8k_cmd_pkt header;
    __le32 sleep_interval;  /* Number of beacon periods to sleep */
    __u8 beacon_data[MWL8K_FJ_BEACON_MAXLEN];
} __packed;

static int mwl8k_cmd_finalize_join(struct ieee80211_hw *hw, void *frame,
                   int framelen, int dtim)
{
    struct mwl8k_cmd_finalize_join *cmd;
    struct ieee80211_mgmt *payload = frame;
    int payload_len;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_FINALIZE_JOIN);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->sleep_interval = cpu_to_le32(dtim ? dtim : 1);

    payload_len = framelen - ieee80211_hdrlen(payload->frame_control);
    if (payload_len < 0)
        payload_len = 0;
    else if (payload_len > MWL8K_FJ_BEACON_MAXLEN)
        payload_len = MWL8K_FJ_BEACON_MAXLEN;

    memcpy(cmd->beacon_data, &payload->u.beacon, payload_len);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_SET_RTS_THRESHOLD.
 */
struct mwl8k_cmd_set_rts_threshold {
    struct mwl8k_cmd_pkt header;
    __le16 action;
    __le16 threshold;
} __packed;

static int
mwl8k_cmd_set_rts_threshold(struct ieee80211_hw *hw, int rts_thresh)
{
    struct mwl8k_cmd_set_rts_threshold *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_RTS_THRESHOLD);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le16(MWL8K_CMD_SET);
    cmd->threshold = cpu_to_le16(rts_thresh);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_SET_SLOT.
 */
struct mwl8k_cmd_set_slot {
    struct mwl8k_cmd_pkt header;
    __le16 action;
    __u8 short_slot;
} __packed;

static int mwl8k_cmd_set_slot(struct ieee80211_hw *hw, bool short_slot_time)
{
    struct mwl8k_cmd_set_slot *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_SLOT);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le16(MWL8K_CMD_SET);
    cmd->short_slot = short_slot_time;

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_SET_EDCA_PARAMS.
 */
struct mwl8k_cmd_set_edca_params {
    struct mwl8k_cmd_pkt header;

    /* See MWL8K_SET_EDCA_XXX below */
    __le16 action;

    /* TX opportunity in units of 32 us */
    __le16 txop;

    union {
        struct {
            /* Log exponent of max contention period: 0...15 */
            __le32 log_cw_max;

            /* Log exponent of min contention period: 0...15 */
            __le32 log_cw_min;

            /* Adaptive interframe spacing in units of 32us */
            __u8 aifs;

            /* TX queue to configure */
            __u8 txq;
        } ap;
        struct {
            /* Log exponent of max contention period: 0...15 */
            __u8 log_cw_max;

            /* Log exponent of min contention period: 0...15 */
            __u8 log_cw_min;

            /* Adaptive interframe spacing in units of 32us */
            __u8 aifs;

            /* TX queue to configure */
            __u8 txq;
        } sta;
    };
} __packed;

#define MWL8K_SET_EDCA_CW   0x01
#define MWL8K_SET_EDCA_TXOP 0x02
#define MWL8K_SET_EDCA_AIFS 0x04

#define MWL8K_SET_EDCA_ALL  (MWL8K_SET_EDCA_CW | \
                 MWL8K_SET_EDCA_TXOP | \
                 MWL8K_SET_EDCA_AIFS)

static int
mwl8k_cmd_set_edca_params(struct ieee80211_hw *hw, __u8 qnum,
              __u16 cw_min, __u16 cw_max,
              __u8 aifs, __u16 txop)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_cmd_set_edca_params *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_EDCA_PARAMS);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le16(MWL8K_SET_EDCA_ALL);
    cmd->txop = cpu_to_le16(txop);
    if (priv->ap_fw) {
        cmd->ap.log_cw_max = cpu_to_le32(ilog2(cw_max + 1));
        cmd->ap.log_cw_min = cpu_to_le32(ilog2(cw_min + 1));
        cmd->ap.aifs = aifs;
        cmd->ap.txq = qnum;
    } else {
        cmd->sta.log_cw_max = (u8)ilog2(cw_max + 1);
        cmd->sta.log_cw_min = (u8)ilog2(cw_min + 1);
        cmd->sta.aifs = aifs;
        cmd->sta.txq = qnum;
    }

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_SET_WMM_MODE.
 */
struct mwl8k_cmd_set_wmm_mode {
    struct mwl8k_cmd_pkt header;
    __le16 action;
} __packed;

static int mwl8k_cmd_set_wmm_mode(struct ieee80211_hw *hw, bool enable)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_cmd_set_wmm_mode *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_WMM_MODE);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le16(!!enable);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    if (!rc)
        priv->wmm_enabled = enable;

    return rc;
}

/*
 * CMD_MIMO_CONFIG.
 */
struct mwl8k_cmd_mimo_config {
    struct mwl8k_cmd_pkt header;
    __le32 action;
    __u8 rx_antenna_map;
    __u8 tx_antenna_map;
} __packed;

static int mwl8k_cmd_mimo_config(struct ieee80211_hw *hw, __u8 rx, __u8 tx)
{
    struct mwl8k_cmd_mimo_config *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_MIMO_CONFIG);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le32((u32)MWL8K_CMD_SET);
    cmd->rx_antenna_map = rx;
    cmd->tx_antenna_map = tx;

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_USE_FIXED_RATE (STA version).
 */
struct mwl8k_cmd_use_fixed_rate_sta {
    struct mwl8k_cmd_pkt header;
    __le32 action;
    __le32 allow_rate_drop;
    __le32 num_rates;
    struct {
        __le32 is_ht_rate;
        __le32 enable_retry;
        __le32 rate;
        __le32 retry_count;
    } rate_entry[8];
    __le32 rate_type;
    __le32 reserved1;
    __le32 reserved2;
} __packed;

#define MWL8K_USE_AUTO_RATE 0x0002
#define MWL8K_UCAST_RATE    0

static int mwl8k_cmd_use_fixed_rate_sta(struct ieee80211_hw *hw)
{
    struct mwl8k_cmd_use_fixed_rate_sta *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_USE_FIXED_RATE);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le32(MWL8K_USE_AUTO_RATE);
    cmd->rate_type = cpu_to_le32(MWL8K_UCAST_RATE);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_USE_FIXED_RATE (AP version).
 */
struct mwl8k_cmd_use_fixed_rate_ap {
    struct mwl8k_cmd_pkt header;
    __le32 action;
    __le32 allow_rate_drop;
    __le32 num_rates;
    struct mwl8k_rate_entry_ap {
        __le32 is_ht_rate;
        __le32 enable_retry;
        __le32 rate;
        __le32 retry_count;
    } rate_entry[4];
    u8 multicast_rate;
    u8 multicast_rate_type;
    u8 management_rate;
} __packed;

static int
mwl8k_cmd_use_fixed_rate_ap(struct ieee80211_hw *hw, int mcast, int mgmt)
{
    struct mwl8k_cmd_use_fixed_rate_ap *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_USE_FIXED_RATE);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le32(MWL8K_USE_AUTO_RATE);
    cmd->multicast_rate = mcast;
    cmd->management_rate = mgmt;

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_ENABLE_SNIFFER.
 */
struct mwl8k_cmd_enable_sniffer {
    struct mwl8k_cmd_pkt header;
    __le32 action;
} __packed;

static int mwl8k_cmd_enable_sniffer(struct ieee80211_hw *hw, bool enable)
{
    struct mwl8k_cmd_enable_sniffer *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_ENABLE_SNIFFER);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le32(!!enable);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

struct mwl8k_cmd_update_mac_addr {
    struct mwl8k_cmd_pkt header;
    union {
        struct {
            __le16 mac_type;
            __u8 mac_addr[ETH_ALEN];
        } mbss;
        __u8 mac_addr[ETH_ALEN];
    };
} __packed;

#define MWL8K_MAC_TYPE_PRIMARY_CLIENT       0
#define MWL8K_MAC_TYPE_SECONDARY_CLIENT     1
#define MWL8K_MAC_TYPE_PRIMARY_AP       2
#define MWL8K_MAC_TYPE_SECONDARY_AP     3

static int mwl8k_cmd_update_mac_addr(struct ieee80211_hw *hw,
                  struct ieee80211_vif *vif, u8 *mac, bool set)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_vif *mwl8k_vif = MWL8K_VIF(vif);
    struct mwl8k_cmd_update_mac_addr *cmd;
    int mac_type;
    int rc;

    mac_type = MWL8K_MAC_TYPE_PRIMARY_AP;
    if (vif != NULL && vif->type == NL80211_IFTYPE_STATION) {
        if (mwl8k_vif->macid + 1 == ffs(priv->sta_macids_supported))
            mac_type = MWL8K_MAC_TYPE_PRIMARY_CLIENT;
        else
            mac_type = MWL8K_MAC_TYPE_SECONDARY_CLIENT;
    } else if (vif != NULL && vif->type == NL80211_IFTYPE_AP) {
        if (mwl8k_vif->macid + 1 == ffs(priv->ap_macids_supported))
            mac_type = MWL8K_MAC_TYPE_PRIMARY_AP;
        else
            mac_type = MWL8K_MAC_TYPE_SECONDARY_AP;
    }

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    if (set)
        cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_MAC_ADDR);
    else
        cmd->header.code = cpu_to_le16(MWL8K_CMD_DEL_MAC_ADDR);

    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    if (priv->ap_fw) {
        cmd->mbss.mac_type = cpu_to_le16(mac_type);
        memcpy(cmd->mbss.mac_addr, mac, ETH_ALEN);
    } else {
        memcpy(cmd->mac_addr, mac, ETH_ALEN);
    }

    rc = mwl8k_post_pervif_cmd(hw, vif, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * MWL8K_CMD_SET_MAC_ADDR.
 */
static inline int mwl8k_cmd_set_mac_addr(struct ieee80211_hw *hw,
                  struct ieee80211_vif *vif, u8 *mac)
{
    return mwl8k_cmd_update_mac_addr(hw, vif, mac, true);
}

/*
 * MWL8K_CMD_DEL_MAC_ADDR.
 */
static inline int mwl8k_cmd_del_mac_addr(struct ieee80211_hw *hw,
                  struct ieee80211_vif *vif, u8 *mac)
{
    return mwl8k_cmd_update_mac_addr(hw, vif, mac, false);
}

/*
 * CMD_SET_RATEADAPT_MODE.
 */
struct mwl8k_cmd_set_rate_adapt_mode {
    struct mwl8k_cmd_pkt header;
    __le16 action;
    __le16 mode;
} __packed;

static int mwl8k_cmd_set_rateadapt_mode(struct ieee80211_hw *hw, __u16 mode)
{
    struct mwl8k_cmd_set_rate_adapt_mode *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_RATEADAPT_MODE);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le16(MWL8K_CMD_SET);
    cmd->mode = cpu_to_le16(mode);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_GET_WATCHDOG_BITMAP.
 */
struct mwl8k_cmd_get_watchdog_bitmap {
    struct mwl8k_cmd_pkt header;
    u8  bitmap;
} __packed;

static int mwl8k_cmd_get_watchdog_bitmap(struct ieee80211_hw *hw, u8 *bitmap)
{
    struct mwl8k_cmd_get_watchdog_bitmap *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_GET_WATCHDOG_BITMAP);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));

    rc = mwl8k_post_cmd(hw, &cmd->header);
    if (!rc)
        *bitmap = cmd->bitmap;

    kfree(cmd);

    return rc;
}

#define INVALID_BA  0xAA
static void mwl8k_watchdog_ba_events(struct work_struct *work)
{
    int rc;
    u8 bitmap = 0, stream_index;
    struct mwl8k_ampdu_stream *streams;
    struct mwl8k_priv *priv =
        container_of(work, struct mwl8k_priv, watchdog_ba_handle);

    rc = mwl8k_cmd_get_watchdog_bitmap(priv->hw, &bitmap);
    if (rc)
        return;

    if (bitmap == INVALID_BA)
        return;

    /* the bitmap is the hw queue number.  Map it to the ampdu queue. */
    stream_index = bitmap - MWL8K_TX_WMM_QUEUES;

    BUG_ON(stream_index >= priv->num_ampdu_queues);

    streams = &priv->ampdu[stream_index];

    if (streams->state == AMPDU_STREAM_ACTIVE)
        ieee80211_stop_tx_ba_session(streams->sta, streams->tid);

    return;
}


/*
 * CMD_BSS_START.
 */
struct mwl8k_cmd_bss_start {
    struct mwl8k_cmd_pkt header;
    __le32 enable;
} __packed;

static int mwl8k_cmd_bss_start(struct ieee80211_hw *hw,
                   struct ieee80211_vif *vif, int enable)
{
    struct mwl8k_cmd_bss_start *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_BSS_START);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->enable = cpu_to_le32(enable);

    rc = mwl8k_post_pervif_cmd(hw, vif, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_BASTREAM.
 */

/*
 * UPSTREAM is tx direction
 */
#define BASTREAM_FLAG_DIRECTION_UPSTREAM    0x00
#define BASTREAM_FLAG_IMMEDIATE_TYPE        0x01

enum ba_stream_action_type {
    MWL8K_BA_CREATE,
    MWL8K_BA_UPDATE,
    MWL8K_BA_DESTROY,
    MWL8K_BA_FLUSH,
    MWL8K_BA_CHECK,
};


struct mwl8k_create_ba_stream {
    __le32  flags;
    __le32  idle_thrs;
    __le32  bar_thrs;
    __le32  window_size;
    u8  peer_mac_addr[6];
    u8  dialog_token;
    u8  tid;
    u8  queue_id;
    u8  param_info;
    __le32  ba_context;
    u8  reset_seq_no_flag;
    __le16  curr_seq_no;
    u8  sta_src_mac_addr[6];
} __packed;

struct mwl8k_destroy_ba_stream {
    __le32  flags;
    __le32  ba_context;
} __packed;

struct mwl8k_cmd_bastream {
    struct mwl8k_cmd_pkt    header;
    __le32  action;
    union {
        struct mwl8k_create_ba_stream   create_params;
        struct mwl8k_destroy_ba_stream  destroy_params;
    };
} __packed;

static int
mwl8k_check_ba(struct ieee80211_hw *hw, struct mwl8k_ampdu_stream *stream)
{
    struct mwl8k_cmd_bastream *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_BASTREAM);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));

    cmd->action = cpu_to_le32(MWL8K_BA_CHECK);

    cmd->create_params.queue_id = stream->idx;
    memcpy(&cmd->create_params.peer_mac_addr[0], stream->sta->addr,
           ETH_ALEN);
    cmd->create_params.tid = stream->tid;

    cmd->create_params.flags =
        cpu_to_le32(BASTREAM_FLAG_IMMEDIATE_TYPE) |
        cpu_to_le32(BASTREAM_FLAG_DIRECTION_UPSTREAM);

    rc = mwl8k_post_cmd(hw, &cmd->header);

    kfree(cmd);

    return rc;
}

static int
mwl8k_create_ba(struct ieee80211_hw *hw, struct mwl8k_ampdu_stream *stream,
        u8 buf_size)
{
    struct mwl8k_cmd_bastream *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;


    cmd->header.code = cpu_to_le16(MWL8K_CMD_BASTREAM);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));

    cmd->action = cpu_to_le32(MWL8K_BA_CREATE);

    cmd->create_params.bar_thrs = cpu_to_le32((u32)buf_size);
    cmd->create_params.window_size = cpu_to_le32((u32)buf_size);
    cmd->create_params.queue_id = stream->idx;

    memcpy(cmd->create_params.peer_mac_addr, stream->sta->addr, ETH_ALEN);
    cmd->create_params.tid = stream->tid;
    cmd->create_params.curr_seq_no = cpu_to_le16(0);
    cmd->create_params.reset_seq_no_flag = 1;

    cmd->create_params.param_info =
        (stream->sta->ht_cap.ampdu_factor &
         IEEE80211_HT_AMPDU_PARM_FACTOR) |
        ((stream->sta->ht_cap.ampdu_density << 2) &
         IEEE80211_HT_AMPDU_PARM_DENSITY);

    cmd->create_params.flags =
        cpu_to_le32(BASTREAM_FLAG_IMMEDIATE_TYPE |
                    BASTREAM_FLAG_DIRECTION_UPSTREAM);

    rc = mwl8k_post_cmd(hw, &cmd->header);

    wiphy_debug(hw->wiphy, "Created a BA stream for %pM : tid %d\n",
        stream->sta->addr, stream->tid);
    kfree(cmd);

    return rc;
}

static void mwl8k_destroy_ba(struct ieee80211_hw *hw,
                 struct mwl8k_ampdu_stream *stream)
{
    struct mwl8k_cmd_bastream *cmd;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_BASTREAM);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le32(MWL8K_BA_DESTROY);

    cmd->destroy_params.ba_context = cpu_to_le32(stream->idx);
    mwl8k_post_cmd(hw, &cmd->header);

    wiphy_debug(hw->wiphy, "Deleted BA stream index %d\n", stream->idx);

    kfree(cmd);
}

/*
 * CMD_SET_NEW_STN.
 */
struct mwl8k_cmd_set_new_stn {
    struct mwl8k_cmd_pkt header;
    __le16 aid;
    __u8 mac_addr[6];
    __le16 stn_id;
    __le16 action;
    __le16 rsvd;
    __le32 legacy_rates;
    __u8 ht_rates[4];
    __le16 cap_info;
    __le16 ht_capabilities_info;
    __u8 mac_ht_param_info;
    __u8 rev;
    __u8 control_channel;
    __u8 add_channel;
    __le16 op_mode;
    __le16 stbc;
    __u8 add_qos_info;
    __u8 is_qos_sta;
    __le32 fw_sta_ptr;
} __packed;

#define MWL8K_STA_ACTION_ADD        0
#define MWL8K_STA_ACTION_REMOVE     2

static int mwl8k_cmd_set_new_stn_add(struct ieee80211_hw *hw,
                     struct ieee80211_vif *vif,
                     struct ieee80211_sta *sta)
{
    struct mwl8k_cmd_set_new_stn *cmd;
    u32 rates;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_NEW_STN);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->aid = cpu_to_le16(sta->aid);
    memcpy(cmd->mac_addr, sta->addr, ETH_ALEN);
    cmd->stn_id = cpu_to_le16(sta->aid);
    cmd->action = cpu_to_le16(MWL8K_STA_ACTION_ADD);
    if (hw->conf.channel->band == IEEE80211_BAND_2GHZ)
        rates = sta->supp_rates[IEEE80211_BAND_2GHZ];
    else
        rates = sta->supp_rates[IEEE80211_BAND_5GHZ] << 5;
    cmd->legacy_rates = cpu_to_le32(rates);
    if (sta->ht_cap.ht_supported) {
        cmd->ht_rates[0] = sta->ht_cap.mcs.rx_mask[0];
        cmd->ht_rates[1] = sta->ht_cap.mcs.rx_mask[1];
        cmd->ht_rates[2] = sta->ht_cap.mcs.rx_mask[2];
        cmd->ht_rates[3] = sta->ht_cap.mcs.rx_mask[3];
        cmd->ht_capabilities_info = cpu_to_le16(sta->ht_cap.cap);
        cmd->mac_ht_param_info = (sta->ht_cap.ampdu_factor & 3) |
            ((sta->ht_cap.ampdu_density & 7) << 2);
        cmd->is_qos_sta = 1;
    }

    rc = mwl8k_post_pervif_cmd(hw, vif, &cmd->header);
    kfree(cmd);

    return rc;
}

static int mwl8k_cmd_set_new_stn_add_self(struct ieee80211_hw *hw,
                      struct ieee80211_vif *vif)
{
    struct mwl8k_cmd_set_new_stn *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_NEW_STN);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    memcpy(cmd->mac_addr, vif->addr, ETH_ALEN);

    rc = mwl8k_post_pervif_cmd(hw, vif, &cmd->header);
    kfree(cmd);

    return rc;
}

static int mwl8k_cmd_set_new_stn_del(struct ieee80211_hw *hw,
                     struct ieee80211_vif *vif, u8 *addr)
{
    struct mwl8k_cmd_set_new_stn *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_NEW_STN);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    memcpy(cmd->mac_addr, addr, ETH_ALEN);
    cmd->action = cpu_to_le16(MWL8K_STA_ACTION_REMOVE);

    rc = mwl8k_post_pervif_cmd(hw, vif, &cmd->header);
    kfree(cmd);

    return rc;
}

/*
 * CMD_UPDATE_ENCRYPTION.
 */

#define MAX_ENCR_KEY_LENGTH 16
#define MIC_KEY_LENGTH      8

struct mwl8k_cmd_update_encryption {
    struct mwl8k_cmd_pkt header;

    __le32 action;
    __le32 reserved;
    __u8 mac_addr[6];
    __u8 encr_type;

} __packed;

struct mwl8k_cmd_set_key {
    struct mwl8k_cmd_pkt header;

    __le32 action;
    __le32 reserved;
    __le16 length;
    __le16 key_type_id;
    __le32 key_info;
    __le32 key_id;
    __le16 key_len;
    __u8 key_material[MAX_ENCR_KEY_LENGTH];
    __u8 tkip_tx_mic_key[MIC_KEY_LENGTH];
    __u8 tkip_rx_mic_key[MIC_KEY_LENGTH];
    __le16 tkip_rsc_low;
    __le32 tkip_rsc_high;
    __le16 tkip_tsc_low;
    __le32 tkip_tsc_high;
    __u8 mac_addr[6];
} __packed;

enum {
    MWL8K_ENCR_ENABLE,
    MWL8K_ENCR_SET_KEY,
    MWL8K_ENCR_REMOVE_KEY,
    MWL8K_ENCR_SET_GROUP_KEY,
};

#define MWL8K_UPDATE_ENCRYPTION_TYPE_WEP    0
#define MWL8K_UPDATE_ENCRYPTION_TYPE_DISABLE    1
#define MWL8K_UPDATE_ENCRYPTION_TYPE_TKIP   4
#define MWL8K_UPDATE_ENCRYPTION_TYPE_MIXED  7
#define MWL8K_UPDATE_ENCRYPTION_TYPE_AES    8

enum {
    MWL8K_ALG_WEP,
    MWL8K_ALG_TKIP,
    MWL8K_ALG_CCMP,
};

#define MWL8K_KEY_FLAG_TXGROUPKEY   0x00000004
#define MWL8K_KEY_FLAG_PAIRWISE     0x00000008
#define MWL8K_KEY_FLAG_TSC_VALID    0x00000040
#define MWL8K_KEY_FLAG_WEP_TXKEY    0x01000000
#define MWL8K_KEY_FLAG_MICKEY_VALID 0x02000000

static int mwl8k_cmd_update_encryption_enable(struct ieee80211_hw *hw,
                          struct ieee80211_vif *vif,
                          u8 *addr,
                          u8 encr_type)
{
    struct mwl8k_cmd_update_encryption *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_UPDATE_ENCRYPTION);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le32(MWL8K_ENCR_ENABLE);
    memcpy(cmd->mac_addr, addr, ETH_ALEN);
    cmd->encr_type = encr_type;

    rc = mwl8k_post_pervif_cmd(hw, vif, &cmd->header);
    kfree(cmd);

    return rc;
}

static int mwl8k_encryption_set_cmd_info(struct mwl8k_cmd_set_key *cmd,
                        u8 *addr,
                        struct ieee80211_key_conf *key)
{
    cmd->header.code = cpu_to_le16(MWL8K_CMD_UPDATE_ENCRYPTION);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->length = cpu_to_le16(sizeof(*cmd) -
                offsetof(struct mwl8k_cmd_set_key, length));
    cmd->key_id = cpu_to_le32(key->keyidx);
    cmd->key_len = cpu_to_le16(key->keylen);
    memcpy(cmd->mac_addr, addr, ETH_ALEN);

    switch (key->cipher) {
    case WLAN_CIPHER_SUITE_WEP40:
    case WLAN_CIPHER_SUITE_WEP104:
        cmd->key_type_id = cpu_to_le16(MWL8K_ALG_WEP);
        if (key->keyidx == 0)
            cmd->key_info = cpu_to_le32(MWL8K_KEY_FLAG_WEP_TXKEY);

        break;
    case WLAN_CIPHER_SUITE_TKIP:
        cmd->key_type_id = cpu_to_le16(MWL8K_ALG_TKIP);
        cmd->key_info = (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
            ? cpu_to_le32(MWL8K_KEY_FLAG_PAIRWISE)
            : cpu_to_le32(MWL8K_KEY_FLAG_TXGROUPKEY);
        cmd->key_info |= cpu_to_le32(MWL8K_KEY_FLAG_MICKEY_VALID
                        | MWL8K_KEY_FLAG_TSC_VALID);
        break;
    case WLAN_CIPHER_SUITE_CCMP:
        cmd->key_type_id = cpu_to_le16(MWL8K_ALG_CCMP);
        cmd->key_info = (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
            ? cpu_to_le32(MWL8K_KEY_FLAG_PAIRWISE)
            : cpu_to_le32(MWL8K_KEY_FLAG_TXGROUPKEY);
        break;
    default:
        return -ENOTSUPP;
    }

    return 0;
}

static int mwl8k_cmd_encryption_set_key(struct ieee80211_hw *hw,
                        struct ieee80211_vif *vif,
                        u8 *addr,
                        struct ieee80211_key_conf *key)
{
    struct mwl8k_cmd_set_key *cmd;
    int rc;
    int keymlen;
    u32 action;
    u8 idx;
    struct mwl8k_vif *mwl8k_vif = MWL8K_VIF(vif);

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    rc = mwl8k_encryption_set_cmd_info(cmd, addr, key);
    if (rc < 0)
        goto done;

    idx = key->keyidx;

    if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
        action = MWL8K_ENCR_SET_KEY;
    else
        action = MWL8K_ENCR_SET_GROUP_KEY;

    switch (key->cipher) {
    case WLAN_CIPHER_SUITE_WEP40:
    case WLAN_CIPHER_SUITE_WEP104:
        if (!mwl8k_vif->wep_key_conf[idx].enabled) {
            memcpy(mwl8k_vif->wep_key_conf[idx].key, key,
                        sizeof(*key) + key->keylen);
            mwl8k_vif->wep_key_conf[idx].enabled = 1;
        }

        keymlen = key->keylen;
        action = MWL8K_ENCR_SET_KEY;
        break;
    case WLAN_CIPHER_SUITE_TKIP:
        keymlen = MAX_ENCR_KEY_LENGTH + 2 * MIC_KEY_LENGTH;
        break;
    case WLAN_CIPHER_SUITE_CCMP:
        keymlen = key->keylen;
        break;
    default:
        rc = -ENOTSUPP;
        goto done;
    }

    memcpy(cmd->key_material, key->key, keymlen);
    cmd->action = cpu_to_le32(action);

    rc = mwl8k_post_pervif_cmd(hw, vif, &cmd->header);
done:
    kfree(cmd);

    return rc;
}

static int mwl8k_cmd_encryption_remove_key(struct ieee80211_hw *hw,
                        struct ieee80211_vif *vif,
                        u8 *addr,
                        struct ieee80211_key_conf *key)
{
    struct mwl8k_cmd_set_key *cmd;
    int rc;
    struct mwl8k_vif *mwl8k_vif = MWL8K_VIF(vif);

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    rc = mwl8k_encryption_set_cmd_info(cmd, addr, key);
    if (rc < 0)
        goto done;

    if (key->cipher == WLAN_CIPHER_SUITE_WEP40 ||
            key->cipher == WLAN_CIPHER_SUITE_WEP104)
        mwl8k_vif->wep_key_conf[key->keyidx].enabled = 0;

    cmd->action = cpu_to_le32(MWL8K_ENCR_REMOVE_KEY);

    rc = mwl8k_post_pervif_cmd(hw, vif, &cmd->header);
done:
    kfree(cmd);

    return rc;
}

static int mwl8k_set_key(struct ieee80211_hw *hw,
             enum set_key_cmd cmd_param,
             struct ieee80211_vif *vif,
             struct ieee80211_sta *sta,
             struct ieee80211_key_conf *key)
{
    int rc = 0;
    u8 encr_type;
    u8 *addr;
    struct mwl8k_vif *mwl8k_vif = MWL8K_VIF(vif);

    if (vif->type == NL80211_IFTYPE_STATION)
        return -EOPNOTSUPP;

    if (sta == NULL)
        addr = vif->addr;
    else
        addr = sta->addr;

    if (cmd_param == SET_KEY) {
        rc = mwl8k_cmd_encryption_set_key(hw, vif, addr, key);
        if (rc)
            goto out;

        if ((key->cipher == WLAN_CIPHER_SUITE_WEP40)
                || (key->cipher == WLAN_CIPHER_SUITE_WEP104))
            encr_type = MWL8K_UPDATE_ENCRYPTION_TYPE_WEP;
        else
            encr_type = MWL8K_UPDATE_ENCRYPTION_TYPE_MIXED;

        rc = mwl8k_cmd_update_encryption_enable(hw, vif, addr,
                                encr_type);
        if (rc)
            goto out;

        mwl8k_vif->is_hw_crypto_enabled = true;

    } else {
        rc = mwl8k_cmd_encryption_remove_key(hw, vif, addr, key);

        if (rc)
            goto out;
    }
out:
    return rc;
}

/*
 * CMD_UPDATE_STADB.
 */
struct ewc_ht_info {
    __le16  control1;
    __le16  control2;
    __le16  control3;
} __packed;

struct peer_capability_info {
    /* Peer type - AP vs. STA.  */
    __u8    peer_type;

    /* Basic 802.11 capabilities from assoc resp.  */
    __le16  basic_caps;

    /* Set if peer supports 802.11n high throughput (HT).  */
    __u8    ht_support;

    /* Valid if HT is supported.  */
    __le16  ht_caps;
    __u8    extended_ht_caps;
    struct ewc_ht_info  ewc_info;

    /* Legacy rate table. Intersection of our rates and peer rates.  */
    __u8    legacy_rates[12];

    /* HT rate table. Intersection of our rates and peer rates.  */
    __u8    ht_rates[16];
    __u8    pad[16];

    /* If set, interoperability mode, no proprietary extensions.  */
    __u8    interop;
    __u8    pad2;
    __u8    station_id;
    __le16  amsdu_enabled;
} __packed;

struct mwl8k_cmd_update_stadb {
    struct mwl8k_cmd_pkt header;

    /* See STADB_ACTION_TYPE */
    __le32  action;

    /* Peer MAC address */
    __u8    peer_addr[ETH_ALEN];

    __le32  reserved;

    /* Peer info - valid during add/update.  */
    struct peer_capability_info peer_info;
} __packed;

#define MWL8K_STA_DB_MODIFY_ENTRY   1
#define MWL8K_STA_DB_DEL_ENTRY      2

/* Peer Entry flags - used to define the type of the peer node */
#define MWL8K_PEER_TYPE_ACCESSPOINT 2

static int mwl8k_cmd_update_stadb_add(struct ieee80211_hw *hw,
                      struct ieee80211_vif *vif,
                      struct ieee80211_sta *sta)
{
    struct mwl8k_cmd_update_stadb *cmd;
    struct peer_capability_info *p;
    u32 rates;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_UPDATE_STADB);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le32(MWL8K_STA_DB_MODIFY_ENTRY);
    memcpy(cmd->peer_addr, sta->addr, ETH_ALEN);

    p = &cmd->peer_info;
    p->peer_type = MWL8K_PEER_TYPE_ACCESSPOINT;
    p->basic_caps = cpu_to_le16(vif->bss_conf.assoc_capability);
    p->ht_support = sta->ht_cap.ht_supported;
    p->ht_caps = cpu_to_le16(sta->ht_cap.cap);
    p->extended_ht_caps = (sta->ht_cap.ampdu_factor & 3) |
        ((sta->ht_cap.ampdu_density & 7) << 2);
    if (hw->conf.channel->band == IEEE80211_BAND_2GHZ)
        rates = sta->supp_rates[IEEE80211_BAND_2GHZ];
    else
        rates = sta->supp_rates[IEEE80211_BAND_5GHZ] << 5;
    legacy_rate_mask_to_array(p->legacy_rates, rates);
    memcpy(p->ht_rates, sta->ht_cap.mcs.rx_mask, 16);
    p->interop = 1;
    p->amsdu_enabled = 0;

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc ? rc : p->station_id;
}

static int mwl8k_cmd_update_stadb_del(struct ieee80211_hw *hw,
                      struct ieee80211_vif *vif, u8 *addr)
{
    struct mwl8k_cmd_update_stadb *cmd;
    int rc;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    cmd->header.code = cpu_to_le16(MWL8K_CMD_UPDATE_STADB);
    cmd->header.length = cpu_to_le16(sizeof(*cmd));
    cmd->action = cpu_to_le32(MWL8K_STA_DB_DEL_ENTRY);
    memcpy(cmd->peer_addr, addr, ETH_ALEN);

    rc = mwl8k_post_cmd(hw, &cmd->header);
    kfree(cmd);

    return rc;
}


/*
 * Interrupt handling.
 */
static irqreturn_t mwl8k_interrupt(int irq, void *dev_id)
{
    struct ieee80211_hw *hw = dev_id;
    struct mwl8k_priv *priv = hw->priv;
    u32 status;

    status = ioread32(priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
    if (!status)
        return IRQ_NONE;

    if (status & MWL8K_A2H_INT_TX_DONE) {
        status &= ~MWL8K_A2H_INT_TX_DONE;
        tasklet_schedule(&priv->poll_tx_task);
    }

    if (status & MWL8K_A2H_INT_RX_READY) {
        status &= ~MWL8K_A2H_INT_RX_READY;
        tasklet_schedule(&priv->poll_rx_task);
    }

    if (status & MWL8K_A2H_INT_BA_WATCHDOG) {
        status &= ~MWL8K_A2H_INT_BA_WATCHDOG;
        ieee80211_queue_work(hw, &priv->watchdog_ba_handle);
    }

    if (status)
        iowrite32(~status, priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);

    if (status & MWL8K_A2H_INT_OPC_DONE) {
        if (priv->hostcmd_wait != NULL)
            complete(priv->hostcmd_wait);
    }

    if (status & MWL8K_A2H_INT_QUEUE_EMPTY) {
        if (!mutex_is_locked(&priv->fw_mutex) &&
            priv->radio_on && priv->pending_tx_pkts)
            mwl8k_tx_start(priv);
    }

    return IRQ_HANDLED;
}

static void mwl8k_tx_poll(unsigned long data)
{
    struct ieee80211_hw *hw = (struct ieee80211_hw *)data;
    struct mwl8k_priv *priv = hw->priv;
    int limit;
    int i;

    limit = 32;

    spin_lock_bh(&priv->tx_lock);

    for (i = 0; i < mwl8k_tx_queues(priv); i++)
        limit -= mwl8k_txq_reclaim(hw, i, limit, 0);

    if (!priv->pending_tx_pkts && priv->tx_wait != NULL) {
        complete(priv->tx_wait);
        priv->tx_wait = NULL;
    }

    spin_unlock_bh(&priv->tx_lock);

    if (limit) {
        writel(~MWL8K_A2H_INT_TX_DONE,
               priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
    } else {
        tasklet_schedule(&priv->poll_tx_task);
    }
}

static void mwl8k_rx_poll(unsigned long data)
{
    struct ieee80211_hw *hw = (struct ieee80211_hw *)data;
    struct mwl8k_priv *priv = hw->priv;
    int limit;

    limit = 32;
    limit -= rxq_process(hw, 0, limit);
    limit -= rxq_refill(hw, 0, limit);

    if (limit) {
        writel(~MWL8K_A2H_INT_RX_READY,
               priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
    } else {
        tasklet_schedule(&priv->poll_rx_task);
    }
}


/*
 * Core driver operations.
 */
static void mwl8k_tx(struct ieee80211_hw *hw,
             struct ieee80211_tx_control *control,
             struct sk_buff *skb)
{
    struct mwl8k_priv *priv = hw->priv;
    int index = skb_get_queue_mapping(skb);

    if (!priv->radio_on) {
        wiphy_debug(hw->wiphy,
                "dropped TX frame since radio disabled\n");
        dev_kfree_skb(skb);
        return;
    }

    mwl8k_txq_xmit(hw, index, control->sta, skb);
}

static int mwl8k_start(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;
    int rc;

    rc = request_irq(priv->pdev->irq, mwl8k_interrupt,
             IRQF_SHARED, MWL8K_NAME, hw);
    if (rc) {
        priv->irq = -1;
        wiphy_err(hw->wiphy, "failed to register IRQ handler\n");
        return -EIO;
    }
    priv->irq = priv->pdev->irq;

    /* Enable TX reclaim and RX tasklets.  */
    tasklet_enable(&priv->poll_tx_task);
    tasklet_enable(&priv->poll_rx_task);

    /* Enable interrupts */
    iowrite32(MWL8K_A2H_EVENTS, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
    iowrite32(MWL8K_A2H_EVENTS,
          priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS_MASK);

    rc = mwl8k_fw_lock(hw);
    if (!rc) {
        rc = mwl8k_cmd_radio_enable(hw);

        if (!priv->ap_fw) {
            if (!rc)
                rc = mwl8k_cmd_enable_sniffer(hw, 0);

            if (!rc)
                rc = mwl8k_cmd_set_pre_scan(hw);

            if (!rc)
                rc = mwl8k_cmd_set_post_scan(hw,
                        "\x00\x00\x00\x00\x00\x00");
        }

        if (!rc)
            rc = mwl8k_cmd_set_rateadapt_mode(hw, 0);

        if (!rc)
            rc = mwl8k_cmd_set_wmm_mode(hw, 0);

        mwl8k_fw_unlock(hw);
    }

    if (rc) {
        iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
        free_irq(priv->pdev->irq, hw);
        priv->irq = -1;
        tasklet_disable(&priv->poll_tx_task);
        tasklet_disable(&priv->poll_rx_task);
    }

    return rc;
}

static void mwl8k_stop(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;
    int i;

    if (!priv->hw_restart_in_progress)
        mwl8k_cmd_radio_disable(hw);

    ieee80211_stop_queues(hw);

    /* Disable interrupts */
    iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
    if (priv->irq != -1) {
        free_irq(priv->pdev->irq, hw);
        priv->irq = -1;
    }

    /* Stop finalize join worker */
    cancel_work_sync(&priv->finalize_join_worker);
    cancel_work_sync(&priv->watchdog_ba_handle);
    if (priv->beacon_skb != NULL)
        dev_kfree_skb(priv->beacon_skb);

    /* Stop TX reclaim and RX tasklets.  */
    tasklet_disable(&priv->poll_tx_task);
    tasklet_disable(&priv->poll_rx_task);

    /* Return all skbs to mac80211 */
    for (i = 0; i < mwl8k_tx_queues(priv); i++)
        mwl8k_txq_reclaim(hw, i, INT_MAX, 1);
}

static int mwl8k_reload_firmware(struct ieee80211_hw *hw, char *fw_image);

static int mwl8k_add_interface(struct ieee80211_hw *hw,
                   struct ieee80211_vif *vif)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_vif *mwl8k_vif;
    u32 macids_supported;
    int macid, rc;
    struct mwl8k_device_info *di;

    /*
     * Reject interface creation if sniffer mode is active, as
     * STA operation is mutually exclusive with hardware sniffer
     * mode.  (Sniffer mode is only used on STA firmware.)
     */
    if (priv->sniffer_enabled) {
        wiphy_info(hw->wiphy,
               "unable to create STA interface because sniffer mode is enabled\n");
        return -EINVAL;
    }

    di = priv->device_info;
    switch (vif->type) {
    case NL80211_IFTYPE_AP:
        if (!priv->ap_fw && di->fw_image_ap) {
            /* we must load the ap fw to meet this request */
            if (!list_empty(&priv->vif_list))
                return -EBUSY;
            rc = mwl8k_reload_firmware(hw, di->fw_image_ap);
            if (rc)
                return rc;
        }
        macids_supported = priv->ap_macids_supported;
        break;
    case NL80211_IFTYPE_STATION:
        if (priv->ap_fw && di->fw_image_sta) {
            /* we must load the sta fw to meet this request */
            if (!list_empty(&priv->vif_list))
                return -EBUSY;
            rc = mwl8k_reload_firmware(hw, di->fw_image_sta);
            if (rc)
                return rc;
        }
        macids_supported = priv->sta_macids_supported;
        break;
    default:
        return -EINVAL;
    }

    macid = ffs(macids_supported & ~priv->macids_used);
    if (!macid--)
        return -EBUSY;

    /* Setup driver private area. */
    mwl8k_vif = MWL8K_VIF(vif);
    memset(mwl8k_vif, 0, sizeof(*mwl8k_vif));
    mwl8k_vif->vif = vif;
    mwl8k_vif->macid = macid;
    mwl8k_vif->seqno = 0;
    memcpy(mwl8k_vif->bssid, vif->addr, ETH_ALEN);
    mwl8k_vif->is_hw_crypto_enabled = false;

    /* Set the mac address.  */
    mwl8k_cmd_set_mac_addr(hw, vif, vif->addr);

    if (priv->ap_fw)
        mwl8k_cmd_set_new_stn_add_self(hw, vif);

    priv->macids_used |= 1 << mwl8k_vif->macid;
    list_add_tail(&mwl8k_vif->list, &priv->vif_list);

    return 0;
}

static void mwl8k_remove_vif(struct mwl8k_priv *priv, struct mwl8k_vif *vif)
{
    /* Has ieee80211_restart_hw re-added the removed interfaces? */
    if (!priv->macids_used)
        return;

    priv->macids_used &= ~(1 << vif->macid);
    list_del(&vif->list);
}

static void mwl8k_remove_interface(struct ieee80211_hw *hw,
                   struct ieee80211_vif *vif)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_vif *mwl8k_vif = MWL8K_VIF(vif);

    if (priv->ap_fw)
        mwl8k_cmd_set_new_stn_del(hw, vif, vif->addr);

    mwl8k_cmd_del_mac_addr(hw, vif, vif->addr);

    mwl8k_remove_vif(priv, mwl8k_vif);
}

static void mwl8k_hw_restart_work(struct work_struct *work)
{
    struct mwl8k_priv *priv =
        container_of(work, struct mwl8k_priv, fw_reload);
    struct ieee80211_hw *hw = priv->hw;
    struct mwl8k_device_info *di;
    int rc;

    /* If some command is waiting for a response, clear it */
    if (priv->hostcmd_wait != NULL) {
        complete(priv->hostcmd_wait);
        priv->hostcmd_wait = NULL;
    }

    priv->hw_restart_owner = current;
    di = priv->device_info;
    mwl8k_fw_lock(hw);

    if (priv->ap_fw)
        rc = mwl8k_reload_firmware(hw, di->fw_image_ap);
    else
        rc = mwl8k_reload_firmware(hw, di->fw_image_sta);

    if (rc)
        goto fail;

    priv->hw_restart_owner = NULL;
    priv->hw_restart_in_progress = false;

    /*
     * This unlock will wake up the queues and
     * also opens the command path for other
     * commands
     */
    mwl8k_fw_unlock(hw);

    ieee80211_restart_hw(hw);

    wiphy_err(hw->wiphy, "Firmware restarted successfully\n");

    return;
fail:
    mwl8k_fw_unlock(hw);

    wiphy_err(hw->wiphy, "Firmware restart failed\n");
}

static int mwl8k_config(struct ieee80211_hw *hw, u32 changed)
{
    struct ieee80211_conf *conf = &hw->conf;
    struct mwl8k_priv *priv = hw->priv;
    int rc;

    if (conf->flags & IEEE80211_CONF_IDLE) {
        mwl8k_cmd_radio_disable(hw);
        return 0;
    }

    rc = mwl8k_fw_lock(hw);
    if (rc)
        return rc;

    rc = mwl8k_cmd_radio_enable(hw);
    if (rc)
        goto out;

    rc = mwl8k_cmd_set_rf_channel(hw, conf);
    if (rc)
        goto out;

    if (conf->power_level > 18)
        conf->power_level = 18;

    if (priv->ap_fw) {

        if (conf->flags & IEEE80211_CONF_CHANGE_POWER) {
            rc = mwl8k_cmd_tx_power(hw, conf, conf->power_level);
            if (rc)
                goto out;
        }

        rc = mwl8k_cmd_rf_antenna(hw, MWL8K_RF_ANTENNA_RX, 0x3);
        if (rc)
            wiphy_warn(hw->wiphy, "failed to set # of RX antennas");
        rc = mwl8k_cmd_rf_antenna(hw, MWL8K_RF_ANTENNA_TX, 0x7);
        if (rc)
            wiphy_warn(hw->wiphy, "failed to set # of TX antennas");

    } else {
        rc = mwl8k_cmd_rf_tx_power(hw, conf->power_level);
        if (rc)
            goto out;
        rc = mwl8k_cmd_mimo_config(hw, 0x7, 0x7);
    }

out:
    mwl8k_fw_unlock(hw);

    return rc;
}

static void
mwl8k_bss_info_changed_sta(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
               struct ieee80211_bss_conf *info, u32 changed)
{
    struct mwl8k_priv *priv = hw->priv;
    u32 ap_legacy_rates = 0;
    u8 ap_mcs_rates[16];
    int rc;

    if (mwl8k_fw_lock(hw))
        return;

    /*
     * No need to capture a beacon if we're no longer associated.
     */
    if ((changed & BSS_CHANGED_ASSOC) && !vif->bss_conf.assoc)
        priv->capture_beacon = false;

    /*
     * Get the AP's legacy and MCS rates.
     */
    if (vif->bss_conf.assoc) {
        struct ieee80211_sta *ap;

        rcu_read_lock();

        ap = ieee80211_find_sta(vif, vif->bss_conf.bssid);
        if (ap == NULL) {
            rcu_read_unlock();
            goto out;
        }

        if (hw->conf.channel->band == IEEE80211_BAND_2GHZ) {
            ap_legacy_rates = ap->supp_rates[IEEE80211_BAND_2GHZ];
        } else {
            ap_legacy_rates =
                ap->supp_rates[IEEE80211_BAND_5GHZ] << 5;
        }
        memcpy(ap_mcs_rates, ap->ht_cap.mcs.rx_mask, 16);

        rcu_read_unlock();
    }

    if ((changed & BSS_CHANGED_ASSOC) && vif->bss_conf.assoc) {
        rc = mwl8k_cmd_set_rate(hw, vif, ap_legacy_rates, ap_mcs_rates);
        if (rc)
            goto out;

        rc = mwl8k_cmd_use_fixed_rate_sta(hw);
        if (rc)
            goto out;
    }

    if (changed & BSS_CHANGED_ERP_PREAMBLE) {
        rc = mwl8k_set_radio_preamble(hw,
                vif->bss_conf.use_short_preamble);
        if (rc)
            goto out;
    }

    if (changed & BSS_CHANGED_ERP_SLOT) {
        rc = mwl8k_cmd_set_slot(hw, vif->bss_conf.use_short_slot);
        if (rc)
            goto out;
    }

    if (vif->bss_conf.assoc &&
        (changed & (BSS_CHANGED_ASSOC | BSS_CHANGED_ERP_CTS_PROT |
            BSS_CHANGED_HT))) {
        rc = mwl8k_cmd_set_aid(hw, vif, ap_legacy_rates);
        if (rc)
            goto out;
    }

    if (vif->bss_conf.assoc &&
        (changed & (BSS_CHANGED_ASSOC | BSS_CHANGED_BEACON_INT))) {
        /*
         * Finalize the join.  Tell rx handler to process
         * next beacon from our BSSID.
         */
        memcpy(priv->capture_bssid, vif->bss_conf.bssid, ETH_ALEN);
        priv->capture_beacon = true;
    }

out:
    mwl8k_fw_unlock(hw);
}

static void
mwl8k_bss_info_changed_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
              struct ieee80211_bss_conf *info, u32 changed)
{
    int rc;

    if (mwl8k_fw_lock(hw))
        return;

    if (changed & BSS_CHANGED_ERP_PREAMBLE) {
        rc = mwl8k_set_radio_preamble(hw,
                vif->bss_conf.use_short_preamble);
        if (rc)
            goto out;
    }

    if (changed & BSS_CHANGED_BASIC_RATES) {
        int idx;
        int rate;

        /*
         * Use lowest supported basic rate for multicasts
         * and management frames (such as probe responses --
         * beacons will always go out at 1 Mb/s).
         */
        idx = ffs(vif->bss_conf.basic_rates);
        if (idx)
            idx--;

        if (hw->conf.channel->band == IEEE80211_BAND_2GHZ)
            rate = mwl8k_rates_24[idx].hw_value;
        else
            rate = mwl8k_rates_50[idx].hw_value;

        mwl8k_cmd_use_fixed_rate_ap(hw, rate, rate);
    }

    if (changed & (BSS_CHANGED_BEACON_INT | BSS_CHANGED_BEACON)) {
        struct sk_buff *skb;

        skb = ieee80211_beacon_get(hw, vif);
        if (skb != NULL) {
            mwl8k_cmd_set_beacon(hw, vif, skb->data, skb->len);
            kfree_skb(skb);
        }
    }

    if (changed & BSS_CHANGED_BEACON_ENABLED)
        mwl8k_cmd_bss_start(hw, vif, info->enable_beacon);

out:
    mwl8k_fw_unlock(hw);
}

static void
mwl8k_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
               struct ieee80211_bss_conf *info, u32 changed)
{
    struct mwl8k_priv *priv = hw->priv;

    if (!priv->ap_fw)
        mwl8k_bss_info_changed_sta(hw, vif, info, changed);
    else
        mwl8k_bss_info_changed_ap(hw, vif, info, changed);
}

static u64 mwl8k_prepare_multicast(struct ieee80211_hw *hw,
                   struct netdev_hw_addr_list *mc_list)
{
    struct mwl8k_cmd_pkt *cmd;

    /*
     * Synthesize and return a command packet that programs the
     * hardware multicast address filter.  At this point we don't
     * know whether FIF_ALLMULTI is being requested, but if it is,
     * we'll end up throwing this packet away and creating a new
     * one in mwl8k_configure_filter().
     */
    cmd = __mwl8k_cmd_mac_multicast_adr(hw, 0, mc_list);

    return (unsigned long)cmd;
}

static int
mwl8k_configure_filter_sniffer(struct ieee80211_hw *hw,
                   unsigned int changed_flags,
                   unsigned int *total_flags)
{
    struct mwl8k_priv *priv = hw->priv;

    /*
     * Hardware sniffer mode is mutually exclusive with STA
     * operation, so refuse to enable sniffer mode if a STA
     * interface is active.
     */
    if (!list_empty(&priv->vif_list)) {
        if (net_ratelimit())
            wiphy_info(hw->wiphy,
                   "not enabling sniffer mode because STA interface is active\n");
        return 0;
    }

    if (!priv->sniffer_enabled) {
        if (mwl8k_cmd_enable_sniffer(hw, 1))
            return 0;
        priv->sniffer_enabled = true;
    }

    *total_flags &= FIF_PROMISC_IN_BSS | FIF_ALLMULTI |
            FIF_BCN_PRBRESP_PROMISC | FIF_CONTROL |
            FIF_OTHER_BSS;

    return 1;
}

static struct mwl8k_vif *mwl8k_first_vif(struct mwl8k_priv *priv)
{
    if (!list_empty(&priv->vif_list))
        return list_entry(priv->vif_list.next, struct mwl8k_vif, list);

    return NULL;
}

static void mwl8k_configure_filter(struct ieee80211_hw *hw,
                   unsigned int changed_flags,
                   unsigned int *total_flags,
                   u64 multicast)
{
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_cmd_pkt *cmd = (void *)(unsigned long)multicast;

    /*
     * AP firmware doesn't allow fine-grained control over
     * the receive filter.
     */
    if (priv->ap_fw) {
        *total_flags &= FIF_ALLMULTI | FIF_BCN_PRBRESP_PROMISC;
        kfree(cmd);
        return;
    }

    /*
     * Enable hardware sniffer mode if FIF_CONTROL or
     * FIF_OTHER_BSS is requested.
     */
    if (*total_flags & (FIF_CONTROL | FIF_OTHER_BSS) &&
        mwl8k_configure_filter_sniffer(hw, changed_flags, total_flags)) {
        kfree(cmd);
        return;
    }

    /* Clear unsupported feature flags */
    *total_flags &= FIF_ALLMULTI | FIF_BCN_PRBRESP_PROMISC;

    if (mwl8k_fw_lock(hw)) {
        kfree(cmd);
        return;
    }

    if (priv->sniffer_enabled) {
        mwl8k_cmd_enable_sniffer(hw, 0);
        priv->sniffer_enabled = false;
    }

    if (changed_flags & FIF_BCN_PRBRESP_PROMISC) {
        if (*total_flags & FIF_BCN_PRBRESP_PROMISC) {
            /*
             * Disable the BSS filter.
             */
            mwl8k_cmd_set_pre_scan(hw);
        } else {
            struct mwl8k_vif *mwl8k_vif;
            const u8 *bssid;

            /*
             * Enable the BSS filter.
             *
             * If there is an active STA interface, use that
             * interface's BSSID, otherwise use a dummy one
             * (where the OUI part needs to be nonzero for
             * the BSSID to be accepted by POST_SCAN).
             */
            mwl8k_vif = mwl8k_first_vif(priv);
            if (mwl8k_vif != NULL)
                bssid = mwl8k_vif->vif->bss_conf.bssid;
            else
                bssid = "\x01\x00\x00\x00\x00\x00";

            mwl8k_cmd_set_post_scan(hw, bssid);
        }
    }

    /*
     * If FIF_ALLMULTI is being requested, throw away the command
     * packet that ->prepare_multicast() built and replace it with
     * a command packet that enables reception of all multicast
     * packets.
     */
    if (*total_flags & FIF_ALLMULTI) {
        kfree(cmd);
        cmd = __mwl8k_cmd_mac_multicast_adr(hw, 1, NULL);
    }

    if (cmd != NULL) {
        mwl8k_post_cmd(hw, cmd);
        kfree(cmd);
    }

    mwl8k_fw_unlock(hw);
}

static int mwl8k_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
{
    return mwl8k_cmd_set_rts_threshold(hw, value);
}

static int mwl8k_sta_remove(struct ieee80211_hw *hw,
                struct ieee80211_vif *vif,
                struct ieee80211_sta *sta)
{
    struct mwl8k_priv *priv = hw->priv;

    if (priv->ap_fw)
        return mwl8k_cmd_set_new_stn_del(hw, vif, sta->addr);
    else
        return mwl8k_cmd_update_stadb_del(hw, vif, sta->addr);
}

static int mwl8k_sta_add(struct ieee80211_hw *hw,
             struct ieee80211_vif *vif,
             struct ieee80211_sta *sta)
{
    struct mwl8k_priv *priv = hw->priv;
    int ret;
    int i;
    struct mwl8k_vif *mwl8k_vif = MWL8K_VIF(vif);
    struct ieee80211_key_conf *key;

    if (!priv->ap_fw) {
        ret = mwl8k_cmd_update_stadb_add(hw, vif, sta);
        if (ret >= 0) {
            MWL8K_STA(sta)->peer_id = ret;
            if (sta->ht_cap.ht_supported)
                MWL8K_STA(sta)->is_ampdu_allowed = true;
            ret = 0;
        }

    } else {
        ret = mwl8k_cmd_set_new_stn_add(hw, vif, sta);
    }

    for (i = 0; i < NUM_WEP_KEYS; i++) {
        key = IEEE80211_KEY_CONF(mwl8k_vif->wep_key_conf[i].key);
        if (mwl8k_vif->wep_key_conf[i].enabled)
            mwl8k_set_key(hw, SET_KEY, vif, sta, key);
    }
    return ret;
}

static int mwl8k_conf_tx(struct ieee80211_hw *hw,
             struct ieee80211_vif *vif, u16 queue,
             const struct ieee80211_tx_queue_params *params)
{
    struct mwl8k_priv *priv = hw->priv;
    int rc;

    rc = mwl8k_fw_lock(hw);
    if (!rc) {
        BUG_ON(queue > MWL8K_TX_WMM_QUEUES - 1);
        memcpy(&priv->wmm_params[queue], params, sizeof(*params));

        if (!priv->wmm_enabled)
            rc = mwl8k_cmd_set_wmm_mode(hw, 1);

        if (!rc) {
            int q = MWL8K_TX_WMM_QUEUES - 1 - queue;
            rc = mwl8k_cmd_set_edca_params(hw, q,
                               params->cw_min,
                               params->cw_max,
                               params->aifs,
                               params->txop);
        }

        mwl8k_fw_unlock(hw);
    }

    return rc;
}

static int mwl8k_get_stats(struct ieee80211_hw *hw,
               struct ieee80211_low_level_stats *stats)
{
    return mwl8k_cmd_get_stat(hw, stats);
}

static int mwl8k_get_survey(struct ieee80211_hw *hw, int idx,
                struct survey_info *survey)
{
    struct mwl8k_priv *priv = hw->priv;
    struct ieee80211_conf *conf = &hw->conf;

    if (idx != 0)
        return -ENOENT;

    survey->channel = conf->channel;
    survey->filled = SURVEY_INFO_NOISE_DBM;
    survey->noise = priv->noise;

    return 0;
}

#define MAX_AMPDU_ATTEMPTS 5

static int
mwl8k_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
           enum ieee80211_ampdu_mlme_action action,
           struct ieee80211_sta *sta, u16 tid, u16 *ssn,
           u8 buf_size)
{

    int i, rc = 0;
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_ampdu_stream *stream;
    u8 *addr = sta->addr;

    if (!(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION))
        return -ENOTSUPP;

    spin_lock(&priv->stream_lock);
    stream = mwl8k_lookup_stream(hw, addr, tid);

    switch (action) {
    case IEEE80211_AMPDU_RX_START:
    case IEEE80211_AMPDU_RX_STOP:
        break;
    case IEEE80211_AMPDU_TX_START:
        /* By the time we get here the hw queues may contain outgoing
         * packets for this RA/TID that are not part of this BA
         * session.  The hw will assign sequence numbers to these
         * packets as they go out.  So if we query the hw for its next
         * sequence number and use that for the SSN here, it may end up
         * being wrong, which will lead to sequence number mismatch at
         * the recipient.  To avoid this, we reset the sequence number
         * to O for the first MPDU in this BA stream.
         */
        *ssn = 0;
        if (stream == NULL) {
            /* This means that somebody outside this driver called
             * ieee80211_start_tx_ba_session.  This is unexpected
             * because we do our own rate control.  Just warn and
             * move on.
             */
            wiphy_warn(hw->wiphy, "Unexpected call to %s.  "
                   "Proceeding anyway.\n", __func__);
            stream = mwl8k_add_stream(hw, sta, tid);
        }
        if (stream == NULL) {
            wiphy_debug(hw->wiphy, "no free AMPDU streams\n");
            rc = -EBUSY;
            break;
        }
        stream->state = AMPDU_STREAM_IN_PROGRESS;

        /* Release the lock before we do the time consuming stuff */
        spin_unlock(&priv->stream_lock);
        for (i = 0; i < MAX_AMPDU_ATTEMPTS; i++) {
            rc = mwl8k_check_ba(hw, stream);

            /* If HW restart is in progress mwl8k_post_cmd will
             * return -EBUSY. Avoid retrying mwl8k_check_ba in
             * such cases
             */
            if (!rc || rc == -EBUSY)
                break;
            /*
             * HW queues take time to be flushed, give them
             * sufficient time
             */

            msleep(1000);
        }
        spin_lock(&priv->stream_lock);
        if (rc) {
            wiphy_err(hw->wiphy, "Stream for tid %d busy after %d"
                " attempts\n", tid, MAX_AMPDU_ATTEMPTS);
            mwl8k_remove_stream(hw, stream);
            rc = -EBUSY;
            break;
        }
        ieee80211_start_tx_ba_cb_irqsafe(vif, addr, tid);
        break;
    case IEEE80211_AMPDU_TX_STOP:
        if (stream) {
            if (stream->state == AMPDU_STREAM_ACTIVE) {
                spin_unlock(&priv->stream_lock);
                mwl8k_destroy_ba(hw, stream);
                spin_lock(&priv->stream_lock);
            }
            mwl8k_remove_stream(hw, stream);
        }
        ieee80211_stop_tx_ba_cb_irqsafe(vif, addr, tid);
        break;
    case IEEE80211_AMPDU_TX_OPERATIONAL:
        BUG_ON(stream == NULL);
        BUG_ON(stream->state != AMPDU_STREAM_IN_PROGRESS);
        spin_unlock(&priv->stream_lock);
        rc = mwl8k_create_ba(hw, stream, buf_size);
        spin_lock(&priv->stream_lock);
        if (!rc)
            stream->state = AMPDU_STREAM_ACTIVE;
        else {
            spin_unlock(&priv->stream_lock);
            mwl8k_destroy_ba(hw, stream);
            spin_lock(&priv->stream_lock);
            wiphy_debug(hw->wiphy,
                "Failed adding stream for sta %pM tid %d\n",
                addr, tid);
            mwl8k_remove_stream(hw, stream);
        }
        break;

    default:
        rc = -ENOTSUPP;
    }

    spin_unlock(&priv->stream_lock);
    return rc;
}

static const struct ieee80211_ops mwl8k_ops = {
    .tx         = mwl8k_tx,
    .start          = mwl8k_start,
    .stop           = mwl8k_stop,
    .add_interface      = mwl8k_add_interface,
    .remove_interface   = mwl8k_remove_interface,
    .config         = mwl8k_config,
    .bss_info_changed   = mwl8k_bss_info_changed,
    .prepare_multicast  = mwl8k_prepare_multicast,
    .configure_filter   = mwl8k_configure_filter,
    .set_key                = mwl8k_set_key,
    .set_rts_threshold  = mwl8k_set_rts_threshold,
    .sta_add        = mwl8k_sta_add,
    .sta_remove     = mwl8k_sta_remove,
    .conf_tx        = mwl8k_conf_tx,
    .get_stats      = mwl8k_get_stats,
    .get_survey     = mwl8k_get_survey,
    .ampdu_action       = mwl8k_ampdu_action,
};

static void mwl8k_finalize_join_worker(struct work_struct *work)
{
    struct mwl8k_priv *priv =
        container_of(work, struct mwl8k_priv, finalize_join_worker);
    struct sk_buff *skb = priv->beacon_skb;
    struct ieee80211_mgmt *mgmt = (void *)skb->data;
    int len = skb->len - offsetof(struct ieee80211_mgmt, u.beacon.variable);
    const u8 *tim = cfg80211_find_ie(WLAN_EID_TIM,
                     mgmt->u.beacon.variable, len);
    int dtim_period = 1;

    if (tim && tim[1] >= 2)
        dtim_period = tim[3];

    mwl8k_cmd_finalize_join(priv->hw, skb->data, skb->len, dtim_period);

    dev_kfree_skb(skb);
    priv->beacon_skb = NULL;
}

enum {
    MWL8363 = 0,
    MWL8687,
    MWL8366,
};

#define MWL8K_8366_AP_FW_API 2
#define _MWL8K_8366_AP_FW(api) "mwl8k/fmimage_8366_ap-" #api ".fw"
#define MWL8K_8366_AP_FW(api) _MWL8K_8366_AP_FW(api)

static struct mwl8k_device_info mwl8k_info_tbl[] __devinitdata = {
    [MWL8363] = {
        .part_name  = "88w8363",
        .helper_image   = "mwl8k/helper_8363.fw",
        .fw_image_sta   = "mwl8k/fmimage_8363.fw",
    },
    [MWL8687] = {
        .part_name  = "88w8687",
        .helper_image   = "mwl8k/helper_8687.fw",
        .fw_image_sta   = "mwl8k/fmimage_8687.fw",
    },
    [MWL8366] = {
        .part_name  = "88w8366",
        .helper_image   = "mwl8k/helper_8366.fw",
        .fw_image_sta   = "mwl8k/fmimage_8366.fw",
        .fw_image_ap    = MWL8K_8366_AP_FW(MWL8K_8366_AP_FW_API),
        .fw_api_ap  = MWL8K_8366_AP_FW_API,
        .ap_rxd_ops = &rxd_8366_ap_ops,
    },
};

MODULE_FIRMWARE("mwl8k/helper_8363.fw");
MODULE_FIRMWARE("mwl8k/fmimage_8363.fw");
MODULE_FIRMWARE("mwl8k/helper_8687.fw");
MODULE_FIRMWARE("mwl8k/fmimage_8687.fw");
MODULE_FIRMWARE("mwl8k/helper_8366.fw");
MODULE_FIRMWARE("mwl8k/fmimage_8366.fw");
MODULE_FIRMWARE(MWL8K_8366_AP_FW(MWL8K_8366_AP_FW_API));

static DEFINE_PCI_DEVICE_TABLE(mwl8k_pci_id_table) = {
    { PCI_VDEVICE(MARVELL, 0x2a0a), .driver_data = MWL8363, },
    { PCI_VDEVICE(MARVELL, 0x2a0c), .driver_data = MWL8363, },
    { PCI_VDEVICE(MARVELL, 0x2a24), .driver_data = MWL8363, },
    { PCI_VDEVICE(MARVELL, 0x2a2b), .driver_data = MWL8687, },
    { PCI_VDEVICE(MARVELL, 0x2a30), .driver_data = MWL8687, },
    { PCI_VDEVICE(MARVELL, 0x2a40), .driver_data = MWL8366, },
    { PCI_VDEVICE(MARVELL, 0x2a43), .driver_data = MWL8366, },
    { },
};
MODULE_DEVICE_TABLE(pci, mwl8k_pci_id_table);

static int mwl8k_request_alt_fw(struct mwl8k_priv *priv)
{
    int rc;
    printk(KERN_ERR "%s: Error requesting preferred fw %s.\n"
           "Trying alternative firmware %s\n", pci_name(priv->pdev),
           priv->fw_pref, priv->fw_alt);
    rc = mwl8k_request_fw(priv, priv->fw_alt, &priv->fw_ucode, true);
    if (rc) {
        printk(KERN_ERR "%s: Error requesting alt fw %s\n",
               pci_name(priv->pdev), priv->fw_alt);
        return rc;
    }
    return 0;
}

static int mwl8k_firmware_load_success(struct mwl8k_priv *priv);
static void mwl8k_fw_state_machine(const struct firmware *fw, void *context)
{
    struct mwl8k_priv *priv = context;
    struct mwl8k_device_info *di = priv->device_info;
    int rc;

    switch (priv->fw_state) {
    case FW_STATE_INIT:
        if (!fw) {
            printk(KERN_ERR "%s: Error requesting helper fw %s\n",
                   pci_name(priv->pdev), di->helper_image);
            goto fail;
        }
        priv->fw_helper = fw;
        rc = mwl8k_request_fw(priv, priv->fw_pref, &priv->fw_ucode,
                      true);
        if (rc && priv->fw_alt) {
            rc = mwl8k_request_alt_fw(priv);
            if (rc)
                goto fail;
            priv->fw_state = FW_STATE_LOADING_ALT;
        } else if (rc)
            goto fail;
        else
            priv->fw_state = FW_STATE_LOADING_PREF;
        break;

    case FW_STATE_LOADING_PREF:
        if (!fw) {
            if (priv->fw_alt) {
                rc = mwl8k_request_alt_fw(priv);
                if (rc)
                    goto fail;
                priv->fw_state = FW_STATE_LOADING_ALT;
            } else
                goto fail;
        } else {
            priv->fw_ucode = fw;
            rc = mwl8k_firmware_load_success(priv);
            if (rc)
                goto fail;
            else
                complete(&priv->firmware_loading_complete);
        }
        break;

    case FW_STATE_LOADING_ALT:
        if (!fw) {
            printk(KERN_ERR "%s: Error requesting alt fw %s\n",
                   pci_name(priv->pdev), di->helper_image);
            goto fail;
        }
        priv->fw_ucode = fw;
        rc = mwl8k_firmware_load_success(priv);
        if (rc)
            goto fail;
        else
            complete(&priv->firmware_loading_complete);
        break;

    default:
        printk(KERN_ERR "%s: Unexpected firmware loading state: %d\n",
               MWL8K_NAME, priv->fw_state);
        BUG_ON(1);
    }

    return;

fail:
    priv->fw_state = FW_STATE_ERROR;
    complete(&priv->firmware_loading_complete);
    device_release_driver(&priv->pdev->dev);
    mwl8k_release_firmware(priv);
}

#define MAX_RESTART_ATTEMPTS 1
static int mwl8k_init_firmware(struct ieee80211_hw *hw, char *fw_image,
                   bool nowait)
{
    struct mwl8k_priv *priv = hw->priv;
    int rc;
    int count = MAX_RESTART_ATTEMPTS;

retry:
    /* Reset firmware and hardware */
    mwl8k_hw_reset(priv);

    /* Ask userland hotplug daemon for the device firmware */
    rc = mwl8k_request_firmware(priv, fw_image, nowait);
    if (rc) {
        wiphy_err(hw->wiphy, "Firmware files not found\n");
        return rc;
    }

    if (nowait)
        return rc;

    /* Load firmware into hardware */
    rc = mwl8k_load_firmware(hw);
    if (rc)
        wiphy_err(hw->wiphy, "Cannot start firmware\n");

    /* Reclaim memory once firmware is successfully loaded */
    mwl8k_release_firmware(priv);

    if (rc && count) {
        /* FW did not start successfully;
         * lets try one more time
         */
        count--;
        wiphy_err(hw->wiphy, "Trying to reload the firmware again\n");
        msleep(20);
        goto retry;
    }

    return rc;
}

static int mwl8k_init_txqs(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;
    int rc = 0;
    int i;

    for (i = 0; i < mwl8k_tx_queues(priv); i++) {
        rc = mwl8k_txq_init(hw, i);
        if (rc)
            break;
        if (priv->ap_fw)
            iowrite32(priv->txq[i].txd_dma,
                  priv->sram + priv->txq_offset[i]);
    }
    return rc;
}

/* initialize hw after successfully loading a firmware image */
static int mwl8k_probe_hw(struct ieee80211_hw *hw)
{
    struct mwl8k_priv *priv = hw->priv;
    int rc = 0;
    int i;

    if (priv->ap_fw) {
        priv->rxd_ops = priv->device_info->ap_rxd_ops;
        if (priv->rxd_ops == NULL) {
            wiphy_err(hw->wiphy,
                  "Driver does not have AP firmware image support for this hardware\n");
            goto err_stop_firmware;
        }
    } else {
        priv->rxd_ops = &rxd_sta_ops;
    }

    priv->sniffer_enabled = false;
    priv->wmm_enabled = false;
    priv->pending_tx_pkts = 0;

    rc = mwl8k_rxq_init(hw, 0);
    if (rc)
        goto err_stop_firmware;
    rxq_refill(hw, 0, INT_MAX);

    /* For the sta firmware, we need to know the dma addresses of tx queues
     * before sending MWL8K_CMD_GET_HW_SPEC.  So we must initialize them
     * prior to issuing this command.  But for the AP case, we learn the
     * total number of queues from the result CMD_GET_HW_SPEC, so for this
     * case we must initialize the tx queues after.
     */
    priv->num_ampdu_queues = 0;
    if (!priv->ap_fw) {
        rc = mwl8k_init_txqs(hw);
        if (rc)
            goto err_free_queues;
    }

    iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
    iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
    iowrite32(MWL8K_A2H_INT_TX_DONE|MWL8K_A2H_INT_RX_READY|
          MWL8K_A2H_INT_BA_WATCHDOG,
          priv->regs + MWL8K_HIU_A2H_INTERRUPT_CLEAR_SEL);
    iowrite32(MWL8K_A2H_INT_OPC_DONE,
          priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS_MASK);

    rc = request_irq(priv->pdev->irq, mwl8k_interrupt,
             IRQF_SHARED, MWL8K_NAME, hw);
    if (rc) {
        wiphy_err(hw->wiphy, "failed to register IRQ handler\n");
        goto err_free_queues;
    }

    /*
     * When hw restart is requested,
     * mac80211 will take care of clearing
     * the ampdu streams, so do not clear
     * the ampdu state here
     */
    if (!priv->hw_restart_in_progress)
        memset(priv->ampdu, 0, sizeof(priv->ampdu));

    /*
     * Temporarily enable interrupts.  Initial firmware host
     * commands use interrupts and avoid polling.  Disable
     * interrupts when done.
     */
    iowrite32(MWL8K_A2H_EVENTS, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);

    /* Get config data, mac addrs etc */
    if (priv->ap_fw) {
        rc = mwl8k_cmd_get_hw_spec_ap(hw);
        if (!rc)
            rc = mwl8k_init_txqs(hw);
        if (!rc)
            rc = mwl8k_cmd_set_hw_spec(hw);
    } else {
        rc = mwl8k_cmd_get_hw_spec_sta(hw);
    }
    if (rc) {
        wiphy_err(hw->wiphy, "Cannot initialise firmware\n");
        goto err_free_irq;
    }

    /* Turn radio off */
    rc = mwl8k_cmd_radio_disable(hw);
    if (rc) {
        wiphy_err(hw->wiphy, "Cannot disable\n");
        goto err_free_irq;
    }

    /* Clear MAC address */
    rc = mwl8k_cmd_set_mac_addr(hw, NULL, "\x00\x00\x00\x00\x00\x00");
    if (rc) {
        wiphy_err(hw->wiphy, "Cannot clear MAC address\n");
        goto err_free_irq;
    }

    /* Disable interrupts */
    iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
    free_irq(priv->pdev->irq, hw);

    wiphy_info(hw->wiphy, "%s v%d, %pm, %s firmware %u.%u.%u.%u\n",
           priv->device_info->part_name,
           priv->hw_rev, hw->wiphy->perm_addr,
           priv->ap_fw ? "AP" : "STA",
           (priv->fw_rev >> 24) & 0xff, (priv->fw_rev >> 16) & 0xff,
           (priv->fw_rev >> 8) & 0xff, priv->fw_rev & 0xff);

    return 0;

err_free_irq:
    iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
    free_irq(priv->pdev->irq, hw);

err_free_queues:
    for (i = 0; i < mwl8k_tx_queues(priv); i++)
        mwl8k_txq_deinit(hw, i);
    mwl8k_rxq_deinit(hw, 0);

err_stop_firmware:
    mwl8k_hw_reset(priv);

    return rc;
}

/*
 * invoke mwl8k_reload_firmware to change the firmware image after the device
 * has already been registered
 */
static int mwl8k_reload_firmware(struct ieee80211_hw *hw, char *fw_image)
{
    int i, rc = 0;
    struct mwl8k_priv *priv = hw->priv;
    struct mwl8k_vif *vif, *tmp_vif;

    mwl8k_stop(hw);
    mwl8k_rxq_deinit(hw, 0);

    /*
     * All the existing interfaces are re-added by the ieee80211_reconfig;
     * which means driver should remove existing interfaces before calling
     * ieee80211_restart_hw
     */
    if (priv->hw_restart_in_progress)
        list_for_each_entry_safe(vif, tmp_vif, &priv->vif_list, list)
            mwl8k_remove_vif(priv, vif);

    for (i = 0; i < mwl8k_tx_queues(priv); i++)
        mwl8k_txq_deinit(hw, i);

    rc = mwl8k_init_firmware(hw, fw_image, false);
    if (rc)
        goto fail;

    rc = mwl8k_probe_hw(hw);
    if (rc)
        goto fail;

    if (priv->hw_restart_in_progress)
        return rc;

    rc = mwl8k_start(hw);
    if (rc)
        goto fail;

    rc = mwl8k_config(hw, ~0);
    if (rc)
        goto fail;

    for (i = 0; i < MWL8K_TX_WMM_QUEUES; i++) {
        rc = mwl8k_conf_tx(hw, NULL, i, &priv->wmm_params[i]);
        if (rc)
            goto fail;
    }

    return rc;

fail:
    printk(KERN_WARNING "mwl8k: Failed to reload firmware image.\n");
    return rc;
}

static int mwl8k_firmware_load_success(struct mwl8k_priv *priv)
{
    struct ieee80211_hw *hw = priv->hw;
    int i, rc;

    rc = mwl8k_load_firmware(hw);
    mwl8k_release_firmware(priv);
    if (rc) {
        wiphy_err(hw->wiphy, "Cannot start firmware\n");
        return rc;
    }

    /*
     * Extra headroom is the size of the required DMA header
     * minus the size of the smallest 802.11 frame (CTS frame).
     */
    hw->extra_tx_headroom =
        sizeof(struct mwl8k_dma_data) - sizeof(struct ieee80211_cts);

    hw->extra_tx_headroom -= priv->ap_fw ? REDUCED_TX_HEADROOM : 0;

    hw->channel_change_time = 10;

    hw->queues = MWL8K_TX_WMM_QUEUES;

    /* Set rssi values to dBm */
    hw->flags |= IEEE80211_HW_SIGNAL_DBM | IEEE80211_HW_HAS_RATE_CONTROL;

    /*
     * Ask mac80211 to not to trigger PS mode
     * based on PM bit of incoming frames.
     */
    if (priv->ap_fw)
        hw->flags |= IEEE80211_HW_AP_LINK_PS;

    hw->vif_data_size = sizeof(struct mwl8k_vif);
    hw->sta_data_size = sizeof(struct mwl8k_sta);

    priv->macids_used = 0;
    INIT_LIST_HEAD(&priv->vif_list);

    /* Set default radio state and preamble */
    priv->radio_on = false;
    priv->radio_short_preamble = false;

    /* Finalize join worker */
    INIT_WORK(&priv->finalize_join_worker, mwl8k_finalize_join_worker);
    /* Handle watchdog ba events */
    INIT_WORK(&priv->watchdog_ba_handle, mwl8k_watchdog_ba_events);
    /* To reload the firmware if it crashes */
    INIT_WORK(&priv->fw_reload, mwl8k_hw_restart_work);

    /* TX reclaim and RX tasklets.  */
    tasklet_init(&priv->poll_tx_task, mwl8k_tx_poll, (unsigned long)hw);
    tasklet_disable(&priv->poll_tx_task);
    tasklet_init(&priv->poll_rx_task, mwl8k_rx_poll, (unsigned long)hw);
    tasklet_disable(&priv->poll_rx_task);

    /* Power management cookie */
    priv->cookie = pci_alloc_consistent(priv->pdev, 4, &priv->cookie_dma);
    if (priv->cookie == NULL)
        return -ENOMEM;

    mutex_init(&priv->fw_mutex);
    priv->fw_mutex_owner = NULL;
    priv->fw_mutex_depth = 0;
    priv->hostcmd_wait = NULL;

    spin_lock_init(&priv->tx_lock);

    spin_lock_init(&priv->stream_lock);

    priv->tx_wait = NULL;

    rc = mwl8k_probe_hw(hw);
    if (rc)
        goto err_free_cookie;

    hw->wiphy->interface_modes = 0;
    if (priv->ap_macids_supported || priv->device_info->fw_image_ap)
        hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP);
    if (priv->sta_macids_supported || priv->device_info->fw_image_sta)
        hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_STATION);

    rc = ieee80211_register_hw(hw);
    if (rc) {
        wiphy_err(hw->wiphy, "Cannot register device\n");
        goto err_unprobe_hw;
    }

    return 0;

err_unprobe_hw:
    for (i = 0; i < mwl8k_tx_queues(priv); i++)
        mwl8k_txq_deinit(hw, i);
    mwl8k_rxq_deinit(hw, 0);

err_free_cookie:
    if (priv->cookie != NULL)
        pci_free_consistent(priv->pdev, 4,
                priv->cookie, priv->cookie_dma);

    return rc;
}
static int __devinit mwl8k_probe(struct pci_dev *pdev,
                 const struct pci_device_id *id)
{
    static int printed_version;
    struct ieee80211_hw *hw;
    struct mwl8k_priv *priv;
    struct mwl8k_device_info *di;
    int rc;

    if (!printed_version) {
        printk(KERN_INFO "%s version %s\n", MWL8K_DESC, MWL8K_VERSION);
        printed_version = 1;
    }


    rc = pci_enable_device(pdev);
    if (rc) {
        printk(KERN_ERR "%s: Cannot enable new PCI device\n",
               MWL8K_NAME);
        return rc;
    }

    rc = pci_request_regions(pdev, MWL8K_NAME);
    if (rc) {
        printk(KERN_ERR "%s: Cannot obtain PCI resources\n",
               MWL8K_NAME);
        goto err_disable_device;
    }

    pci_set_master(pdev);


    hw = ieee80211_alloc_hw(sizeof(*priv), &mwl8k_ops);
    if (hw == NULL) {
        printk(KERN_ERR "%s: ieee80211 alloc failed\n", MWL8K_NAME);
        rc = -ENOMEM;
        goto err_free_reg;
    }

    SET_IEEE80211_DEV(hw, &pdev->dev);
    pci_set_drvdata(pdev, hw);

    priv = hw->priv;
    priv->hw = hw;
    priv->pdev = pdev;
    priv->device_info = &mwl8k_info_tbl[id->driver_data];


    priv->sram = pci_iomap(pdev, 0, 0x10000);
    if (priv->sram == NULL) {
        wiphy_err(hw->wiphy, "Cannot map device SRAM\n");
        goto err_iounmap;
    }

    /*
     * If BAR0 is a 32 bit BAR, the register BAR will be BAR1.
     * If BAR0 is a 64 bit BAR, the register BAR will be BAR2.
     */
    priv->regs = pci_iomap(pdev, 1, 0x10000);
    if (priv->regs == NULL) {
        priv->regs = pci_iomap(pdev, 2, 0x10000);
        if (priv->regs == NULL) {
            wiphy_err(hw->wiphy, "Cannot map device registers\n");
            goto err_iounmap;
        }
    }

    /*
     * Choose the initial fw image depending on user input.  If a second
     * image is available, make it the alternative image that will be
     * loaded if the first one fails.
     */
    init_completion(&priv->firmware_loading_complete);
    di = priv->device_info;
    if (ap_mode_default && di->fw_image_ap) {
        priv->fw_pref = di->fw_image_ap;
        priv->fw_alt = di->fw_image_sta;
    } else if (!ap_mode_default && di->fw_image_sta) {
        priv->fw_pref = di->fw_image_sta;
        priv->fw_alt = di->fw_image_ap;
    } else if (ap_mode_default && !di->fw_image_ap && di->fw_image_sta) {
        printk(KERN_WARNING "AP fw is unavailable.  Using STA fw.");
        priv->fw_pref = di->fw_image_sta;
    } else if (!ap_mode_default && !di->fw_image_sta && di->fw_image_ap) {
        printk(KERN_WARNING "STA fw is unavailable.  Using AP fw.");
        priv->fw_pref = di->fw_image_ap;
    }
    rc = mwl8k_init_firmware(hw, priv->fw_pref, true);
    if (rc)
        goto err_stop_firmware;

    priv->hw_restart_in_progress = false;

    return rc;

err_stop_firmware:
    mwl8k_hw_reset(priv);

err_iounmap:
    if (priv->regs != NULL)
        pci_iounmap(pdev, priv->regs);

    if (priv->sram != NULL)
        pci_iounmap(pdev, priv->sram);

    pci_set_drvdata(pdev, NULL);
    ieee80211_free_hw(hw);

err_free_reg:
    pci_release_regions(pdev);

err_disable_device:
    pci_disable_device(pdev);

    return rc;
}

static void __devexit mwl8k_shutdown(struct pci_dev *pdev)
{
    printk(KERN_ERR "===>%s(%u)\n", __func__, __LINE__);
}

static void __devexit mwl8k_remove(struct pci_dev *pdev)
{
    struct ieee80211_hw *hw = pci_get_drvdata(pdev);
    struct mwl8k_priv *priv;
    int i;

    if (hw == NULL)
        return;
    priv = hw->priv;

    wait_for_completion(&priv->firmware_loading_complete);

    if (priv->fw_state == FW_STATE_ERROR) {
        mwl8k_hw_reset(priv);
        goto unmap;
    }

    ieee80211_stop_queues(hw);

    ieee80211_unregister_hw(hw);

    /* Remove TX reclaim and RX tasklets.  */
    tasklet_kill(&priv->poll_tx_task);
    tasklet_kill(&priv->poll_rx_task);

    /* Stop hardware */
    mwl8k_hw_reset(priv);

    /* Return all skbs to mac80211 */
    for (i = 0; i < mwl8k_tx_queues(priv); i++)
        mwl8k_txq_reclaim(hw, i, INT_MAX, 1);

    for (i = 0; i < mwl8k_tx_queues(priv); i++)
        mwl8k_txq_deinit(hw, i);

    mwl8k_rxq_deinit(hw, 0);

    pci_free_consistent(priv->pdev, 4, priv->cookie, priv->cookie_dma);

unmap:
    pci_iounmap(pdev, priv->regs);
    pci_iounmap(pdev, priv->sram);
    pci_set_drvdata(pdev, NULL);
    ieee80211_free_hw(hw);
    pci_release_regions(pdev);
    pci_disable_device(pdev);
}

static struct pci_driver mwl8k_driver = {
    .name       = MWL8K_NAME,
    .id_table   = mwl8k_pci_id_table,
    .probe      = mwl8k_probe,
    .remove     = __devexit_p(mwl8k_remove),
    .shutdown   = __devexit_p(mwl8k_shutdown),
};

module_pci_driver(mwl8k_driver);

MODULE_DESCRIPTION(MWL8K_DESC);
MODULE_VERSION(MWL8K_VERSION);
MODULE_AUTHOR("Lennert Buytenhek <[email protected]>");
MODULE_LICENSE("GPL");