common.c

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/******************************************************************************
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <[email protected]>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *****************************************************************************/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/etherdevice.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/lockdep.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/skbuff.h>
#include <net/mac80211.h>

#include "common.h"

int
_il_poll_bit(struct il_priv *il, u32 addr, u32 bits, u32 mask, int timeout)
{
    const int interval = 10; /* microseconds */
    int t = 0;

    do {
        if ((_il_rd(il, addr) & mask) == (bits & mask))
            return t;
        udelay(interval);
        t += interval;
    } while (t < timeout);

    return -ETIMEDOUT;
}
EXPORT_SYMBOL(_il_poll_bit);

void
il_set_bit(struct il_priv *p, u32 r, u32 m)
{
    unsigned long reg_flags;

    spin_lock_irqsave(&p->reg_lock, reg_flags);
    _il_set_bit(p, r, m);
    spin_unlock_irqrestore(&p->reg_lock, reg_flags);
}
EXPORT_SYMBOL(il_set_bit);

void
il_clear_bit(struct il_priv *p, u32 r, u32 m)
{
    unsigned long reg_flags;

    spin_lock_irqsave(&p->reg_lock, reg_flags);
    _il_clear_bit(p, r, m);
    spin_unlock_irqrestore(&p->reg_lock, reg_flags);
}
EXPORT_SYMBOL(il_clear_bit);

bool
_il_grab_nic_access(struct il_priv *il)
{
    int ret;
    u32 val;

    /* this bit wakes up the NIC */
    _il_set_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);

    /*
     * These bits say the device is running, and should keep running for
     * at least a short while (at least as long as MAC_ACCESS_REQ stays 1),
     * but they do not indicate that embedded SRAM is restored yet;
     * 3945 and 4965 have volatile SRAM, and must save/restore contents
     * to/from host DRAM when sleeping/waking for power-saving.
     * Each direction takes approximately 1/4 millisecond; with this
     * overhead, it's a good idea to grab and hold MAC_ACCESS_REQUEST if a
     * series of register accesses are expected (e.g. reading Event Log),
     * to keep device from sleeping.
     *
     * CSR_UCODE_DRV_GP1 register bit MAC_SLEEP == 0 indicates that
     * SRAM is okay/restored.  We don't check that here because this call
     * is just for hardware register access; but GP1 MAC_SLEEP check is a
     * good idea before accessing 3945/4965 SRAM (e.g. reading Event Log).
     *
     */
    ret =
        _il_poll_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
             (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
              CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
    if (unlikely(ret < 0)) {
        val = _il_rd(il, CSR_GP_CNTRL);
        WARN_ONCE(1, "Timeout waiting for ucode processor access "
                 "(CSR_GP_CNTRL 0x%08x)\n", val);
        _il_wr(il, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
        return false;
    }

    return true;
}
EXPORT_SYMBOL_GPL(_il_grab_nic_access);

int
il_poll_bit(struct il_priv *il, u32 addr, u32 mask, int timeout)
{
    const int interval = 10; /* microseconds */
    int t = 0;

    do {
        if ((il_rd(il, addr) & mask) == mask)
            return t;
        udelay(interval);
        t += interval;
    } while (t < timeout);

    return -ETIMEDOUT;
}
EXPORT_SYMBOL(il_poll_bit);

u32
il_rd_prph(struct il_priv *il, u32 reg)
{
    unsigned long reg_flags;
    u32 val;

    spin_lock_irqsave(&il->reg_lock, reg_flags);
    _il_grab_nic_access(il);
    val = _il_rd_prph(il, reg);
    _il_release_nic_access(il);
    spin_unlock_irqrestore(&il->reg_lock, reg_flags);
    return val;
}
EXPORT_SYMBOL(il_rd_prph);

void
il_wr_prph(struct il_priv *il, u32 addr, u32 val)
{
    unsigned long reg_flags;

    spin_lock_irqsave(&il->reg_lock, reg_flags);
    if (likely(_il_grab_nic_access(il))) {
        _il_wr_prph(il, addr, val);
        _il_release_nic_access(il);
    }
    spin_unlock_irqrestore(&il->reg_lock, reg_flags);
}
EXPORT_SYMBOL(il_wr_prph);

u32
il_read_targ_mem(struct il_priv *il, u32 addr)
{
    unsigned long reg_flags;
    u32 value;

    spin_lock_irqsave(&il->reg_lock, reg_flags);
    _il_grab_nic_access(il);

    _il_wr(il, HBUS_TARG_MEM_RADDR, addr);
    value = _il_rd(il, HBUS_TARG_MEM_RDAT);

    _il_release_nic_access(il);
    spin_unlock_irqrestore(&il->reg_lock, reg_flags);
    return value;
}
EXPORT_SYMBOL(il_read_targ_mem);

void
il_write_targ_mem(struct il_priv *il, u32 addr, u32 val)
{
    unsigned long reg_flags;

    spin_lock_irqsave(&il->reg_lock, reg_flags);
    if (likely(_il_grab_nic_access(il))) {
        _il_wr(il, HBUS_TARG_MEM_WADDR, addr);
        _il_wr(il, HBUS_TARG_MEM_WDAT, val);
        _il_release_nic_access(il);
    }
    spin_unlock_irqrestore(&il->reg_lock, reg_flags);
}
EXPORT_SYMBOL(il_write_targ_mem);

const char *
il_get_cmd_string(u8 cmd)
{
    switch (cmd) {
        IL_CMD(N_ALIVE);
        IL_CMD(N_ERROR);
        IL_CMD(C_RXON);
        IL_CMD(C_RXON_ASSOC);
        IL_CMD(C_QOS_PARAM);
        IL_CMD(C_RXON_TIMING);
        IL_CMD(C_ADD_STA);
        IL_CMD(C_REM_STA);
        IL_CMD(C_WEPKEY);
        IL_CMD(N_3945_RX);
        IL_CMD(C_TX);
        IL_CMD(C_RATE_SCALE);
        IL_CMD(C_LEDS);
        IL_CMD(C_TX_LINK_QUALITY_CMD);
        IL_CMD(C_CHANNEL_SWITCH);
        IL_CMD(N_CHANNEL_SWITCH);
        IL_CMD(C_SPECTRUM_MEASUREMENT);
        IL_CMD(N_SPECTRUM_MEASUREMENT);
        IL_CMD(C_POWER_TBL);
        IL_CMD(N_PM_SLEEP);
        IL_CMD(N_PM_DEBUG_STATS);
        IL_CMD(C_SCAN);
        IL_CMD(C_SCAN_ABORT);
        IL_CMD(N_SCAN_START);
        IL_CMD(N_SCAN_RESULTS);
        IL_CMD(N_SCAN_COMPLETE);
        IL_CMD(N_BEACON);
        IL_CMD(C_TX_BEACON);
        IL_CMD(C_TX_PWR_TBL);
        IL_CMD(C_BT_CONFIG);
        IL_CMD(C_STATS);
        IL_CMD(N_STATS);
        IL_CMD(N_CARD_STATE);
        IL_CMD(N_MISSED_BEACONS);
        IL_CMD(C_CT_KILL_CONFIG);
        IL_CMD(C_SENSITIVITY);
        IL_CMD(C_PHY_CALIBRATION);
        IL_CMD(N_RX_PHY);
        IL_CMD(N_RX_MPDU);
        IL_CMD(N_RX);
        IL_CMD(N_COMPRESSED_BA);
    default:
        return "UNKNOWN";

    }
}
EXPORT_SYMBOL(il_get_cmd_string);

#define HOST_COMPLETE_TIMEOUT (HZ / 2)

static void
il_generic_cmd_callback(struct il_priv *il, struct il_device_cmd *cmd,
            struct il_rx_pkt *pkt)
{
    if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
        IL_ERR("Bad return from %s (0x%08X)\n",
               il_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
        return;
    }
#ifdef CONFIG_IWLEGACY_DEBUG
    switch (cmd->hdr.cmd) {
    case C_TX_LINK_QUALITY_CMD:
    case C_SENSITIVITY:
        D_HC_DUMP("back from %s (0x%08X)\n",
              il_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
        break;
    default:
        D_HC("back from %s (0x%08X)\n", il_get_cmd_string(cmd->hdr.cmd),
             pkt->hdr.flags);
    }
#endif
}

static int
il_send_cmd_async(struct il_priv *il, struct il_host_cmd *cmd)
{
    int ret;

    BUG_ON(!(cmd->flags & CMD_ASYNC));

    /* An asynchronous command can not expect an SKB to be set. */
    BUG_ON(cmd->flags & CMD_WANT_SKB);

    /* Assign a generic callback if one is not provided */
    if (!cmd->callback)
        cmd->callback = il_generic_cmd_callback;

    if (test_bit(S_EXIT_PENDING, &il->status))
        return -EBUSY;

    ret = il_enqueue_hcmd(il, cmd);
    if (ret < 0) {
        IL_ERR("Error sending %s: enqueue_hcmd failed: %d\n",
               il_get_cmd_string(cmd->id), ret);
        return ret;
    }
    return 0;
}

int
il_send_cmd_sync(struct il_priv *il, struct il_host_cmd *cmd)
{
    int cmd_idx;
    int ret;

    lockdep_assert_held(&il->mutex);

    BUG_ON(cmd->flags & CMD_ASYNC);

    /* A synchronous command can not have a callback set. */
    BUG_ON(cmd->callback);

    D_INFO("Attempting to send sync command %s\n",
           il_get_cmd_string(cmd->id));

    set_bit(S_HCMD_ACTIVE, &il->status);
    D_INFO("Setting HCMD_ACTIVE for command %s\n",
           il_get_cmd_string(cmd->id));

    cmd_idx = il_enqueue_hcmd(il, cmd);
    if (cmd_idx < 0) {
        ret = cmd_idx;
        IL_ERR("Error sending %s: enqueue_hcmd failed: %d\n",
               il_get_cmd_string(cmd->id), ret);
        goto out;
    }

    ret = wait_event_timeout(il->wait_command_queue,
                 !test_bit(S_HCMD_ACTIVE, &il->status),
                 HOST_COMPLETE_TIMEOUT);
    if (!ret) {
        if (test_bit(S_HCMD_ACTIVE, &il->status)) {
            IL_ERR("Error sending %s: time out after %dms.\n",
                   il_get_cmd_string(cmd->id),
                   jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));

            clear_bit(S_HCMD_ACTIVE, &il->status);
            D_INFO("Clearing HCMD_ACTIVE for command %s\n",
                   il_get_cmd_string(cmd->id));
            ret = -ETIMEDOUT;
            goto cancel;
        }
    }

    if (test_bit(S_RFKILL, &il->status)) {
        IL_ERR("Command %s aborted: RF KILL Switch\n",
               il_get_cmd_string(cmd->id));
        ret = -ECANCELED;
        goto fail;
    }
    if (test_bit(S_FW_ERROR, &il->status)) {
        IL_ERR("Command %s failed: FW Error\n",
               il_get_cmd_string(cmd->id));
        ret = -EIO;
        goto fail;
    }
    if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) {
        IL_ERR("Error: Response NULL in '%s'\n",
               il_get_cmd_string(cmd->id));
        ret = -EIO;
        goto cancel;
    }

    ret = 0;
    goto out;

cancel:
    if (cmd->flags & CMD_WANT_SKB) {
        /*
         * Cancel the CMD_WANT_SKB flag for the cmd in the
         * TX cmd queue. Otherwise in case the cmd comes
         * in later, it will possibly set an invalid
         * address (cmd->meta.source).
         */
        il->txq[il->cmd_queue].meta[cmd_idx].flags &= ~CMD_WANT_SKB;
    }
fail:
    if (cmd->reply_page) {
        il_free_pages(il, cmd->reply_page);
        cmd->reply_page = 0;
    }
out:
    return ret;
}
EXPORT_SYMBOL(il_send_cmd_sync);

int
il_send_cmd(struct il_priv *il, struct il_host_cmd *cmd)
{
    if (cmd->flags & CMD_ASYNC)
        return il_send_cmd_async(il, cmd);

    return il_send_cmd_sync(il, cmd);
}
EXPORT_SYMBOL(il_send_cmd);

int
il_send_cmd_pdu(struct il_priv *il, u8 id, u16 len, const void *data)
{
    struct il_host_cmd cmd = {
        .id = id,
        .len = len,
        .data = data,
    };

    return il_send_cmd_sync(il, &cmd);
}
EXPORT_SYMBOL(il_send_cmd_pdu);

int
il_send_cmd_pdu_async(struct il_priv *il, u8 id, u16 len, const void *data,
              void (*callback) (struct il_priv *il,
                    struct il_device_cmd *cmd,
                    struct il_rx_pkt *pkt))
{
    struct il_host_cmd cmd = {
        .id = id,
        .len = len,
        .data = data,
    };

    cmd.flags |= CMD_ASYNC;
    cmd.callback = callback;

    return il_send_cmd_async(il, &cmd);
}
EXPORT_SYMBOL(il_send_cmd_pdu_async);

/* default: IL_LED_BLINK(0) using blinking idx table */
static int led_mode;
module_param(led_mode, int, S_IRUGO);
MODULE_PARM_DESC(led_mode,
         "0=system default, " "1=On(RF On)/Off(RF Off), 2=blinking");

/* Throughput       OFF time(ms)    ON time (ms)
 *  >300            25      25
 *  >200 to 300     40      40
 *  >100 to 200     55      55
 *  >70 to 100      65      65
 *  >50 to 70       75      75
 *  >20 to 50       85      85
 *  >10 to 20       95      95
 *  >5 to 10        110     110
 *  >1 to 5         130     130
 *  >0 to 1         167     167
 *  <=0                 SOLID ON
 */
static const struct ieee80211_tpt_blink il_blink[] = {
    {.throughput = 0,       .blink_time = 334},
    {.throughput = 1 * 1024 - 1,    .blink_time = 260},
    {.throughput = 5 * 1024 - 1,    .blink_time = 220},
    {.throughput = 10 * 1024 - 1,   .blink_time = 190},
    {.throughput = 20 * 1024 - 1,   .blink_time = 170},
    {.throughput = 50 * 1024 - 1,   .blink_time = 150},
    {.throughput = 70 * 1024 - 1,   .blink_time = 130},
    {.throughput = 100 * 1024 - 1,  .blink_time = 110},
    {.throughput = 200 * 1024 - 1,  .blink_time = 80},
    {.throughput = 300 * 1024 - 1,  .blink_time = 50},
};

/*
 * Adjust led blink rate to compensate on a MAC Clock difference on every HW
 * Led blink rate analysis showed an average deviation of 0% on 3945,
 * 5% on 4965 HW.
 * Need to compensate on the led on/off time per HW according to the deviation
 * to achieve the desired led frequency
 * The calculation is: (100-averageDeviation)/100 * blinkTime
 * For code efficiency the calculation will be:
 *     compensation = (100 - averageDeviation) * 64 / 100
 *     NewBlinkTime = (compensation * BlinkTime) / 64
 */
static inline u8
il_blink_compensation(struct il_priv *il, u8 time, u16 compensation)
{
    if (!compensation) {
        IL_ERR("undefined blink compensation: "
               "use pre-defined blinking time\n");
        return time;
    }

    return (u8) ((time * compensation) >> 6);
}

/* Set led pattern command */
static int
il_led_cmd(struct il_priv *il, unsigned long on, unsigned long off)
{
    struct il_led_cmd led_cmd = {
        .id = IL_LED_LINK,
        .interval = IL_DEF_LED_INTRVL
    };
    int ret;

    if (!test_bit(S_READY, &il->status))
        return -EBUSY;

    if (il->blink_on == on && il->blink_off == off)
        return 0;

    if (off == 0) {
        /* led is SOLID_ON */
        on = IL_LED_SOLID;
    }

    D_LED("Led blink time compensation=%u\n",
          il->cfg->led_compensation);
    led_cmd.on =
        il_blink_compensation(il, on,
                  il->cfg->led_compensation);
    led_cmd.off =
        il_blink_compensation(il, off,
                  il->cfg->led_compensation);

    ret = il->ops->send_led_cmd(il, &led_cmd);
    if (!ret) {
        il->blink_on = on;
        il->blink_off = off;
    }
    return ret;
}

static void
il_led_brightness_set(struct led_classdev *led_cdev,
              enum led_brightness brightness)
{
    struct il_priv *il = container_of(led_cdev, struct il_priv, led);
    unsigned long on = 0;

    if (brightness > 0)
        on = IL_LED_SOLID;

    il_led_cmd(il, on, 0);
}

static int
il_led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
         unsigned long *delay_off)
{
    struct il_priv *il = container_of(led_cdev, struct il_priv, led);

    return il_led_cmd(il, *delay_on, *delay_off);
}

void
il_leds_init(struct il_priv *il)
{
    int mode = led_mode;
    int ret;

    if (mode == IL_LED_DEFAULT)
        mode = il->cfg->led_mode;

    il->led.name =
        kasprintf(GFP_KERNEL, "%s-led", wiphy_name(il->hw->wiphy));
    il->led.brightness_set = il_led_brightness_set;
    il->led.blink_set = il_led_blink_set;
    il->led.max_brightness = 1;

    switch (mode) {
    case IL_LED_DEFAULT:
        WARN_ON(1);
        break;
    case IL_LED_BLINK:
        il->led.default_trigger =
            ieee80211_create_tpt_led_trigger(il->hw,
                             IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
                             il_blink,
                             ARRAY_SIZE(il_blink));
        break;
    case IL_LED_RF_STATE:
        il->led.default_trigger = ieee80211_get_radio_led_name(il->hw);
        break;
    }

    ret = led_classdev_register(&il->pci_dev->dev, &il->led);
    if (ret) {
        kfree(il->led.name);
        return;
    }

    il->led_registered = true;
}
EXPORT_SYMBOL(il_leds_init);

void
il_leds_exit(struct il_priv *il)
{
    if (!il->led_registered)
        return;

    led_classdev_unregister(&il->led);
    kfree(il->led.name);
}
EXPORT_SYMBOL(il_leds_exit);

/************************** EEPROM BANDS ****************************
 *
 * The il_eeprom_band definitions below provide the mapping from the
 * EEPROM contents to the specific channel number supported for each
 * band.
 *
 * For example, il_priv->eeprom.band_3_channels[4] from the band_3
 * definition below maps to physical channel 42 in the 5.2GHz spectrum.
 * The specific geography and calibration information for that channel
 * is contained in the eeprom map itself.
 *
 * During init, we copy the eeprom information and channel map
 * information into il->channel_info_24/52 and il->channel_map_24/52
 *
 * channel_map_24/52 provides the idx in the channel_info array for a
 * given channel.  We have to have two separate maps as there is channel
 * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
 * band_2
 *
 * A value of 0xff stored in the channel_map indicates that the channel
 * is not supported by the hardware at all.
 *
 * A value of 0xfe in the channel_map indicates that the channel is not
 * valid for Tx with the current hardware.  This means that
 * while the system can tune and receive on a given channel, it may not
 * be able to associate or transmit any frames on that
 * channel.  There is no corresponding channel information for that
 * entry.
 *
 *********************************************************************/

/* 2.4 GHz */
const u8 il_eeprom_band_1[14] = {
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
};

/* 5.2 GHz bands */
static const u8 il_eeprom_band_2[] = {  /* 4915-5080MHz */
    183, 184, 185, 187, 188, 189, 192, 196, 7, 8, 11, 12, 16
};

static const u8 il_eeprom_band_3[] = {  /* 5170-5320MHz */
    34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
};

static const u8 il_eeprom_band_4[] = {  /* 5500-5700MHz */
    100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
};

static const u8 il_eeprom_band_5[] = {  /* 5725-5825MHz */
    145, 149, 153, 157, 161, 165
};

static const u8 il_eeprom_band_6[] = {  /* 2.4 ht40 channel */
    1, 2, 3, 4, 5, 6, 7
};

static const u8 il_eeprom_band_7[] = {  /* 5.2 ht40 channel */
    36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157
};

/******************************************************************************
 *
 * EEPROM related functions
 *
******************************************************************************/

static int
il_eeprom_verify_signature(struct il_priv *il)
{
    u32 gp = _il_rd(il, CSR_EEPROM_GP) & CSR_EEPROM_GP_VALID_MSK;
    int ret = 0;

    D_EEPROM("EEPROM signature=0x%08x\n", gp);
    switch (gp) {
    case CSR_EEPROM_GP_GOOD_SIG_EEP_LESS_THAN_4K:
    case CSR_EEPROM_GP_GOOD_SIG_EEP_MORE_THAN_4K:
        break;
    default:
        IL_ERR("bad EEPROM signature," "EEPROM_GP=0x%08x\n", gp);
        ret = -ENOENT;
        break;
    }
    return ret;
}

const u8 *
il_eeprom_query_addr(const struct il_priv *il, size_t offset)
{
    BUG_ON(offset >= il->cfg->eeprom_size);
    return &il->eeprom[offset];
}
EXPORT_SYMBOL(il_eeprom_query_addr);

u16
il_eeprom_query16(const struct il_priv *il, size_t offset)
{
    if (!il->eeprom)
        return 0;
    return (u16) il->eeprom[offset] | ((u16) il->eeprom[offset + 1] << 8);
}
EXPORT_SYMBOL(il_eeprom_query16);

int
il_eeprom_init(struct il_priv *il)
{
    __le16 *e;
    u32 gp = _il_rd(il, CSR_EEPROM_GP);
    int sz;
    int ret;
    u16 addr;

    /* allocate eeprom */
    sz = il->cfg->eeprom_size;
    D_EEPROM("NVM size = %d\n", sz);
    il->eeprom = kzalloc(sz, GFP_KERNEL);
    if (!il->eeprom) {
        ret = -ENOMEM;
        goto alloc_err;
    }
    e = (__le16 *) il->eeprom;

    il->ops->apm_init(il);

    ret = il_eeprom_verify_signature(il);
    if (ret < 0) {
        IL_ERR("EEPROM not found, EEPROM_GP=0x%08x\n", gp);
        ret = -ENOENT;
        goto err;
    }

    /* Make sure driver (instead of uCode) is allowed to read EEPROM */
    ret = il->ops->eeprom_acquire_semaphore(il);
    if (ret < 0) {
        IL_ERR("Failed to acquire EEPROM semaphore.\n");
        ret = -ENOENT;
        goto err;
    }

    /* eeprom is an array of 16bit values */
    for (addr = 0; addr < sz; addr += sizeof(u16)) {
        u32 r;

        _il_wr(il, CSR_EEPROM_REG,
               CSR_EEPROM_REG_MSK_ADDR & (addr << 1));

        ret =
            _il_poll_bit(il, CSR_EEPROM_REG,
                 CSR_EEPROM_REG_READ_VALID_MSK,
                 CSR_EEPROM_REG_READ_VALID_MSK,
                 IL_EEPROM_ACCESS_TIMEOUT);
        if (ret < 0) {
            IL_ERR("Time out reading EEPROM[%d]\n", addr);
            goto done;
        }
        r = _il_rd(il, CSR_EEPROM_REG);
        e[addr / 2] = cpu_to_le16(r >> 16);
    }

    D_EEPROM("NVM Type: %s, version: 0x%x\n", "EEPROM",
         il_eeprom_query16(il, EEPROM_VERSION));

    ret = 0;
done:
    il->ops->eeprom_release_semaphore(il);

err:
    if (ret)
        il_eeprom_free(il);
    /* Reset chip to save power until we load uCode during "up". */
    il_apm_stop(il);
alloc_err:
    return ret;
}
EXPORT_SYMBOL(il_eeprom_init);

void
il_eeprom_free(struct il_priv *il)
{
    kfree(il->eeprom);
    il->eeprom = NULL;
}
EXPORT_SYMBOL(il_eeprom_free);

static void
il_init_band_reference(const struct il_priv *il, int eep_band,
               int *eeprom_ch_count,
               const struct il_eeprom_channel **eeprom_ch_info,
               const u8 **eeprom_ch_idx)
{
    u32 offset = il->cfg->regulatory_bands[eep_band - 1];

    switch (eep_band) {
    case 1:     /* 2.4GHz band */
        *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_1);
        *eeprom_ch_info =
            (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                     offset);
        *eeprom_ch_idx = il_eeprom_band_1;
        break;
    case 2:     /* 4.9GHz band */
        *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_2);
        *eeprom_ch_info =
            (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                     offset);
        *eeprom_ch_idx = il_eeprom_band_2;
        break;
    case 3:     /* 5.2GHz band */
        *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_3);
        *eeprom_ch_info =
            (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                     offset);
        *eeprom_ch_idx = il_eeprom_band_3;
        break;
    case 4:     /* 5.5GHz band */
        *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_4);
        *eeprom_ch_info =
            (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                     offset);
        *eeprom_ch_idx = il_eeprom_band_4;
        break;
    case 5:     /* 5.7GHz band */
        *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_5);
        *eeprom_ch_info =
            (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                     offset);
        *eeprom_ch_idx = il_eeprom_band_5;
        break;
    case 6:     /* 2.4GHz ht40 channels */
        *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_6);
        *eeprom_ch_info =
            (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                     offset);
        *eeprom_ch_idx = il_eeprom_band_6;
        break;
    case 7:     /* 5 GHz ht40 channels */
        *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_7);
        *eeprom_ch_info =
            (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                     offset);
        *eeprom_ch_idx = il_eeprom_band_7;
        break;
    default:
        BUG();
    }
}

#define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
                ? # x " " : "")

static int
il_mod_ht40_chan_info(struct il_priv *il, enum ieee80211_band band, u16 channel,
              const struct il_eeprom_channel *eeprom_ch,
              u8 clear_ht40_extension_channel)
{
    struct il_channel_info *ch_info;

    ch_info =
        (struct il_channel_info *)il_get_channel_info(il, band, channel);

    if (!il_is_channel_valid(ch_info))
        return -1;

    D_EEPROM("HT40 Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
         " Ad-Hoc %ssupported\n", ch_info->channel,
         il_is_channel_a_band(ch_info) ? "5.2" : "2.4",
         CHECK_AND_PRINT(IBSS), CHECK_AND_PRINT(ACTIVE),
         CHECK_AND_PRINT(RADAR), CHECK_AND_PRINT(WIDE),
         CHECK_AND_PRINT(DFS), eeprom_ch->flags,
         eeprom_ch->max_power_avg,
         ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS) &&
          !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ? "" : "not ");

    ch_info->ht40_eeprom = *eeprom_ch;
    ch_info->ht40_max_power_avg = eeprom_ch->max_power_avg;
    ch_info->ht40_flags = eeprom_ch->flags;
    if (eeprom_ch->flags & EEPROM_CHANNEL_VALID)
        ch_info->ht40_extension_channel &=
            ~clear_ht40_extension_channel;

    return 0;
}

#define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
                ? # x " " : "")

int
il_init_channel_map(struct il_priv *il)
{
    int eeprom_ch_count = 0;
    const u8 *eeprom_ch_idx = NULL;
    const struct il_eeprom_channel *eeprom_ch_info = NULL;
    int band, ch;
    struct il_channel_info *ch_info;

    if (il->channel_count) {
        D_EEPROM("Channel map already initialized.\n");
        return 0;
    }

    D_EEPROM("Initializing regulatory info from EEPROM\n");

    il->channel_count =
        ARRAY_SIZE(il_eeprom_band_1) + ARRAY_SIZE(il_eeprom_band_2) +
        ARRAY_SIZE(il_eeprom_band_3) + ARRAY_SIZE(il_eeprom_band_4) +
        ARRAY_SIZE(il_eeprom_band_5);

    D_EEPROM("Parsing data for %d channels.\n", il->channel_count);

    il->channel_info =
        kzalloc(sizeof(struct il_channel_info) * il->channel_count,
            GFP_KERNEL);
    if (!il->channel_info) {
        IL_ERR("Could not allocate channel_info\n");
        il->channel_count = 0;
        return -ENOMEM;
    }

    ch_info = il->channel_info;

    /* Loop through the 5 EEPROM bands adding them in order to the
     * channel map we maintain (that contains additional information than
     * what just in the EEPROM) */
    for (band = 1; band <= 5; band++) {

        il_init_band_reference(il, band, &eeprom_ch_count,
                       &eeprom_ch_info, &eeprom_ch_idx);

        /* Loop through each band adding each of the channels */
        for (ch = 0; ch < eeprom_ch_count; ch++) {
            ch_info->channel = eeprom_ch_idx[ch];
            ch_info->band =
                (band ==
                 1) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;

            /* permanently store EEPROM's channel regulatory flags
             *   and max power in channel info database. */
            ch_info->eeprom = eeprom_ch_info[ch];

            /* Copy the run-time flags so they are there even on
             * invalid channels */
            ch_info->flags = eeprom_ch_info[ch].flags;
            /* First write that ht40 is not enabled, and then enable
             * one by one */
            ch_info->ht40_extension_channel =
                IEEE80211_CHAN_NO_HT40;

            if (!(il_is_channel_valid(ch_info))) {
                D_EEPROM("Ch. %d Flags %x [%sGHz] - "
                     "No traffic\n", ch_info->channel,
                     ch_info->flags,
                     il_is_channel_a_band(ch_info) ? "5.2" :
                     "2.4");
                ch_info++;
                continue;
            }

            /* Initialize regulatory-based run-time data */
            ch_info->max_power_avg = ch_info->curr_txpow =
                eeprom_ch_info[ch].max_power_avg;
            ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
            ch_info->min_power = 0;

            D_EEPROM("Ch. %d [%sGHz] " "%s%s%s%s%s%s(0x%02x %ddBm):"
                 " Ad-Hoc %ssupported\n", ch_info->channel,
                 il_is_channel_a_band(ch_info) ? "5.2" : "2.4",
                 CHECK_AND_PRINT_I(VALID),
                 CHECK_AND_PRINT_I(IBSS),
                 CHECK_AND_PRINT_I(ACTIVE),
                 CHECK_AND_PRINT_I(RADAR),
                 CHECK_AND_PRINT_I(WIDE),
                 CHECK_AND_PRINT_I(DFS),
                 eeprom_ch_info[ch].flags,
                 eeprom_ch_info[ch].max_power_avg,
                 ((eeprom_ch_info[ch].
                   flags & EEPROM_CHANNEL_IBSS) &&
                  !(eeprom_ch_info[ch].
                    flags & EEPROM_CHANNEL_RADAR)) ? "" :
                 "not ");

            ch_info++;
        }
    }

    /* Check if we do have HT40 channels */
    if (il->cfg->regulatory_bands[5] == EEPROM_REGULATORY_BAND_NO_HT40 &&
        il->cfg->regulatory_bands[6] == EEPROM_REGULATORY_BAND_NO_HT40)
        return 0;

    /* Two additional EEPROM bands for 2.4 and 5 GHz HT40 channels */
    for (band = 6; band <= 7; band++) {
        enum ieee80211_band ieeeband;

        il_init_band_reference(il, band, &eeprom_ch_count,
                       &eeprom_ch_info, &eeprom_ch_idx);

        /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
        ieeeband =
            (band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;

        /* Loop through each band adding each of the channels */
        for (ch = 0; ch < eeprom_ch_count; ch++) {
            /* Set up driver's info for lower half */
            il_mod_ht40_chan_info(il, ieeeband, eeprom_ch_idx[ch],
                          &eeprom_ch_info[ch],
                          IEEE80211_CHAN_NO_HT40PLUS);

            /* Set up driver's info for upper half */
            il_mod_ht40_chan_info(il, ieeeband,
                          eeprom_ch_idx[ch] + 4,
                          &eeprom_ch_info[ch],
                          IEEE80211_CHAN_NO_HT40MINUS);
        }
    }

    return 0;
}
EXPORT_SYMBOL(il_init_channel_map);

/*
 * il_free_channel_map - undo allocations in il_init_channel_map
 */
void
il_free_channel_map(struct il_priv *il)
{
    kfree(il->channel_info);
    il->channel_count = 0;
}
EXPORT_SYMBOL(il_free_channel_map);

const struct il_channel_info *
il_get_channel_info(const struct il_priv *il, enum ieee80211_band band,
            u16 channel)
{
    int i;

    switch (band) {
    case IEEE80211_BAND_5GHZ:
        for (i = 14; i < il->channel_count; i++) {
            if (il->channel_info[i].channel == channel)
                return &il->channel_info[i];
        }
        break;
    case IEEE80211_BAND_2GHZ:
        if (channel >= 1 && channel <= 14)
            return &il->channel_info[channel - 1];
        break;
    default:
        BUG();
    }

    return NULL;
}
EXPORT_SYMBOL(il_get_channel_info);

/*
 * Setting power level allows the card to go to sleep when not busy.
 *
 * We calculate a sleep command based on the required latency, which
 * we get from mac80211. In order to handle thermal throttling, we can
 * also use pre-defined power levels.
 */

/*
 * This defines the old power levels. They are still used by default
 * (level 1) and for thermal throttle (levels 3 through 5)
 */

struct il_power_vec_entry {
    struct il_powertable_cmd cmd;
    u8 no_dtim;     /* number of skip dtim */
};

static void
il_power_sleep_cam_cmd(struct il_priv *il, struct il_powertable_cmd *cmd)
{
    memset(cmd, 0, sizeof(*cmd));

    if (il->power_data.pci_pm)
        cmd->flags |= IL_POWER_PCI_PM_MSK;

    D_POWER("Sleep command for CAM\n");
}

static int
il_set_power(struct il_priv *il, struct il_powertable_cmd *cmd)
{
    D_POWER("Sending power/sleep command\n");
    D_POWER("Flags value = 0x%08X\n", cmd->flags);
    D_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
    D_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
    D_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
        le32_to_cpu(cmd->sleep_interval[0]),
        le32_to_cpu(cmd->sleep_interval[1]),
        le32_to_cpu(cmd->sleep_interval[2]),
        le32_to_cpu(cmd->sleep_interval[3]),
        le32_to_cpu(cmd->sleep_interval[4]));

    return il_send_cmd_pdu(il, C_POWER_TBL,
                   sizeof(struct il_powertable_cmd), cmd);
}

int
il_power_set_mode(struct il_priv *il, struct il_powertable_cmd *cmd, bool force)
{
    int ret;
    bool update_chains;

    lockdep_assert_held(&il->mutex);

    /* Don't update the RX chain when chain noise calibration is running */
    update_chains = il->chain_noise_data.state == IL_CHAIN_NOISE_DONE ||
        il->chain_noise_data.state == IL_CHAIN_NOISE_ALIVE;

    if (!memcmp(&il->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
        return 0;

    if (!il_is_ready_rf(il))
        return -EIO;

    /* scan complete use sleep_power_next, need to be updated */
    memcpy(&il->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
    if (test_bit(S_SCANNING, &il->status) && !force) {
        D_INFO("Defer power set mode while scanning\n");
        return 0;
    }

    if (cmd->flags & IL_POWER_DRIVER_ALLOW_SLEEP_MSK)
        set_bit(S_POWER_PMI, &il->status);

    ret = il_set_power(il, cmd);
    if (!ret) {
        if (!(cmd->flags & IL_POWER_DRIVER_ALLOW_SLEEP_MSK))
            clear_bit(S_POWER_PMI, &il->status);

        if (il->ops->update_chain_flags && update_chains)
            il->ops->update_chain_flags(il);
        else if (il->ops->update_chain_flags)
            D_POWER("Cannot update the power, chain noise "
                "calibration running: %d\n",
                il->chain_noise_data.state);

        memcpy(&il->power_data.sleep_cmd, cmd, sizeof(*cmd));
    } else
        IL_ERR("set power fail, ret = %d", ret);

    return ret;
}

int
il_power_update_mode(struct il_priv *il, bool force)
{
    struct il_powertable_cmd cmd;

    il_power_sleep_cam_cmd(il, &cmd);
    return il_power_set_mode(il, &cmd, force);
}
EXPORT_SYMBOL(il_power_update_mode);

/* initialize to default */
void
il_power_initialize(struct il_priv *il)
{
    u16 lctl = il_pcie_link_ctl(il);

    il->power_data.pci_pm = !(lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN);

    il->power_data.debug_sleep_level_override = -1;

    memset(&il->power_data.sleep_cmd, 0, sizeof(il->power_data.sleep_cmd));
}
EXPORT_SYMBOL(il_power_initialize);

/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
 * sending probe req.  This should be set long enough to hear probe responses
 * from more than one AP.  */
#define IL_ACTIVE_DWELL_TIME_24    (30) /* all times in msec */
#define IL_ACTIVE_DWELL_TIME_52    (20)

#define IL_ACTIVE_DWELL_FACTOR_24GHZ (3)
#define IL_ACTIVE_DWELL_FACTOR_52GHZ (2)

/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
 * Must be set longer than active dwell time.
 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
#define IL_PASSIVE_DWELL_TIME_24   (20) /* all times in msec */
#define IL_PASSIVE_DWELL_TIME_52   (10)
#define IL_PASSIVE_DWELL_BASE      (100)
#define IL_CHANNEL_TUNE_TIME       5

static int
il_send_scan_abort(struct il_priv *il)
{
    int ret;
    struct il_rx_pkt *pkt;
    struct il_host_cmd cmd = {
        .id = C_SCAN_ABORT,
        .flags = CMD_WANT_SKB,
    };

    /* Exit instantly with error when device is not ready
     * to receive scan abort command or it does not perform
     * hardware scan currently */
    if (!test_bit(S_READY, &il->status) ||
        !test_bit(S_GEO_CONFIGURED, &il->status) ||
        !test_bit(S_SCAN_HW, &il->status) ||
        test_bit(S_FW_ERROR, &il->status) ||
        test_bit(S_EXIT_PENDING, &il->status))
        return -EIO;

    ret = il_send_cmd_sync(il, &cmd);
    if (ret)
        return ret;

    pkt = (struct il_rx_pkt *)cmd.reply_page;
    if (pkt->u.status != CAN_ABORT_STATUS) {
        /* The scan abort will return 1 for success or
         * 2 for "failure".  A failure condition can be
         * due to simply not being in an active scan which
         * can occur if we send the scan abort before we
         * the microcode has notified us that a scan is
         * completed. */
        D_SCAN("SCAN_ABORT ret %d.\n", pkt->u.status);
        ret = -EIO;
    }

    il_free_pages(il, cmd.reply_page);
    return ret;
}

static void
il_complete_scan(struct il_priv *il, bool aborted)
{
    /* check if scan was requested from mac80211 */
    if (il->scan_request) {
        D_SCAN("Complete scan in mac80211\n");
        ieee80211_scan_completed(il->hw, aborted);
    }

    il->scan_vif = NULL;
    il->scan_request = NULL;
}

void
il_force_scan_end(struct il_priv *il)
{
    lockdep_assert_held(&il->mutex);

    if (!test_bit(S_SCANNING, &il->status)) {
        D_SCAN("Forcing scan end while not scanning\n");
        return;
    }

    D_SCAN("Forcing scan end\n");
    clear_bit(S_SCANNING, &il->status);
    clear_bit(S_SCAN_HW, &il->status);
    clear_bit(S_SCAN_ABORTING, &il->status);
    il_complete_scan(il, true);
}

static void
il_do_scan_abort(struct il_priv *il)
{
    int ret;

    lockdep_assert_held(&il->mutex);

    if (!test_bit(S_SCANNING, &il->status)) {
        D_SCAN("Not performing scan to abort\n");
        return;
    }

    if (test_and_set_bit(S_SCAN_ABORTING, &il->status)) {
        D_SCAN("Scan abort in progress\n");
        return;
    }

    ret = il_send_scan_abort(il);
    if (ret) {
        D_SCAN("Send scan abort failed %d\n", ret);
        il_force_scan_end(il);
    } else
        D_SCAN("Successfully send scan abort\n");
}

int
il_scan_cancel(struct il_priv *il)
{
    D_SCAN("Queuing abort scan\n");
    queue_work(il->workqueue, &il->abort_scan);
    return 0;
}
EXPORT_SYMBOL(il_scan_cancel);

int
il_scan_cancel_timeout(struct il_priv *il, unsigned long ms)
{
    unsigned long timeout = jiffies + msecs_to_jiffies(ms);

    lockdep_assert_held(&il->mutex);

    D_SCAN("Scan cancel timeout\n");

    il_do_scan_abort(il);

    while (time_before_eq(jiffies, timeout)) {
        if (!test_bit(S_SCAN_HW, &il->status))
            break;
        msleep(20);
    }

    return test_bit(S_SCAN_HW, &il->status);
}
EXPORT_SYMBOL(il_scan_cancel_timeout);

/* Service response to C_SCAN (0x80) */
static void
il_hdl_scan(struct il_priv *il, struct il_rx_buf *rxb)
{
#ifdef CONFIG_IWLEGACY_DEBUG
    struct il_rx_pkt *pkt = rxb_addr(rxb);
    struct il_scanreq_notification *notif =
        (struct il_scanreq_notification *)pkt->u.raw;

    D_SCAN("Scan request status = 0x%x\n", notif->status);
#endif
}

/* Service N_SCAN_START (0x82) */
static void
il_hdl_scan_start(struct il_priv *il, struct il_rx_buf *rxb)
{
    struct il_rx_pkt *pkt = rxb_addr(rxb);
    struct il_scanstart_notification *notif =
        (struct il_scanstart_notification *)pkt->u.raw;
    il->scan_start_tsf = le32_to_cpu(notif->tsf_low);
    D_SCAN("Scan start: " "%d [802.11%s] "
           "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", notif->channel,
           notif->band ? "bg" : "a", le32_to_cpu(notif->tsf_high),
           le32_to_cpu(notif->tsf_low), notif->status, notif->beacon_timer);
}

/* Service N_SCAN_RESULTS (0x83) */
static void
il_hdl_scan_results(struct il_priv *il, struct il_rx_buf *rxb)
{
#ifdef CONFIG_IWLEGACY_DEBUG
    struct il_rx_pkt *pkt = rxb_addr(rxb);
    struct il_scanresults_notification *notif =
        (struct il_scanresults_notification *)pkt->u.raw;

    D_SCAN("Scan ch.res: " "%d [802.11%s] " "(TSF: 0x%08X:%08X) - %d "
           "elapsed=%lu usec\n", notif->channel, notif->band ? "bg" : "a",
           le32_to_cpu(notif->tsf_high), le32_to_cpu(notif->tsf_low),
           le32_to_cpu(notif->stats[0]),
           le32_to_cpu(notif->tsf_low) - il->scan_start_tsf);
#endif
}

/* Service N_SCAN_COMPLETE (0x84) */
static void
il_hdl_scan_complete(struct il_priv *il, struct il_rx_buf *rxb)
{

#ifdef CONFIG_IWLEGACY_DEBUG
    struct il_rx_pkt *pkt = rxb_addr(rxb);
    struct il_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
#endif

    D_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
           scan_notif->scanned_channels, scan_notif->tsf_low,
           scan_notif->tsf_high, scan_notif->status);

    /* The HW is no longer scanning */
    clear_bit(S_SCAN_HW, &il->status);

    D_SCAN("Scan on %sGHz took %dms\n",
           (il->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
           jiffies_to_msecs(jiffies - il->scan_start));

    queue_work(il->workqueue, &il->scan_completed);
}

void
il_setup_rx_scan_handlers(struct il_priv *il)
{
    /* scan handlers */
    il->handlers[C_SCAN] = il_hdl_scan;
    il->handlers[N_SCAN_START] = il_hdl_scan_start;
    il->handlers[N_SCAN_RESULTS] = il_hdl_scan_results;
    il->handlers[N_SCAN_COMPLETE] = il_hdl_scan_complete;
}
EXPORT_SYMBOL(il_setup_rx_scan_handlers);

inline u16
il_get_active_dwell_time(struct il_priv *il, enum ieee80211_band band,
             u8 n_probes)
{
    if (band == IEEE80211_BAND_5GHZ)
        return IL_ACTIVE_DWELL_TIME_52 +
            IL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
    else
        return IL_ACTIVE_DWELL_TIME_24 +
            IL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
}
EXPORT_SYMBOL(il_get_active_dwell_time);

u16
il_get_passive_dwell_time(struct il_priv *il, enum ieee80211_band band,
              struct ieee80211_vif *vif)
{
    u16 value;

    u16 passive =
        (band ==
         IEEE80211_BAND_2GHZ) ? IL_PASSIVE_DWELL_BASE +
        IL_PASSIVE_DWELL_TIME_24 : IL_PASSIVE_DWELL_BASE +
        IL_PASSIVE_DWELL_TIME_52;

    if (il_is_any_associated(il)) {
        /*
         * If we're associated, we clamp the maximum passive
         * dwell time to be 98% of the smallest beacon interval
         * (minus 2 * channel tune time)
         */
        value = il->vif ? il->vif->bss_conf.beacon_int : 0;
        if (value > IL_PASSIVE_DWELL_BASE || !value)
            value = IL_PASSIVE_DWELL_BASE;
        value = (value * 98) / 100 - IL_CHANNEL_TUNE_TIME * 2;
        passive = min(value, passive);
    }

    return passive;
}
EXPORT_SYMBOL(il_get_passive_dwell_time);

void
il_init_scan_params(struct il_priv *il)
{
    u8 ant_idx = fls(il->hw_params.valid_tx_ant) - 1;
    if (!il->scan_tx_ant[IEEE80211_BAND_5GHZ])
        il->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
    if (!il->scan_tx_ant[IEEE80211_BAND_2GHZ])
        il->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
}
EXPORT_SYMBOL(il_init_scan_params);

static int
il_scan_initiate(struct il_priv *il, struct ieee80211_vif *vif)
{
    int ret;

    lockdep_assert_held(&il->mutex);

    cancel_delayed_work(&il->scan_check);

    if (!il_is_ready_rf(il)) {
        IL_WARN("Request scan called when driver not ready.\n");
        return -EIO;
    }

    if (test_bit(S_SCAN_HW, &il->status)) {
        D_SCAN("Multiple concurrent scan requests in parallel.\n");
        return -EBUSY;
    }

    if (test_bit(S_SCAN_ABORTING, &il->status)) {
        D_SCAN("Scan request while abort pending.\n");
        return -EBUSY;
    }

    D_SCAN("Starting scan...\n");

    set_bit(S_SCANNING, &il->status);
    il->scan_start = jiffies;

    ret = il->ops->request_scan(il, vif);
    if (ret) {
        clear_bit(S_SCANNING, &il->status);
        return ret;
    }

    queue_delayed_work(il->workqueue, &il->scan_check,
               IL_SCAN_CHECK_WATCHDOG);

    return 0;
}

int
il_mac_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
           struct cfg80211_scan_request *req)
{
    struct il_priv *il = hw->priv;
    int ret;

    if (req->n_channels == 0) {
        IL_ERR("Can not scan on no channels.\n");
        return -EINVAL;
    }

    mutex_lock(&il->mutex);
    D_MAC80211("enter\n");

    if (test_bit(S_SCANNING, &il->status)) {
        D_SCAN("Scan already in progress.\n");
        ret = -EAGAIN;
        goto out_unlock;
    }

    /* mac80211 will only ask for one band at a time */
    il->scan_request = req;
    il->scan_vif = vif;
    il->scan_band = req->channels[0]->band;

    ret = il_scan_initiate(il, vif);

out_unlock:
    D_MAC80211("leave ret %d\n", ret);
    mutex_unlock(&il->mutex);

    return ret;
}
EXPORT_SYMBOL(il_mac_hw_scan);

static void
il_bg_scan_check(struct work_struct *data)
{
    struct il_priv *il =
        container_of(data, struct il_priv, scan_check.work);

    D_SCAN("Scan check work\n");

    /* Since we are here firmware does not finish scan and
     * most likely is in bad shape, so we don't bother to
     * send abort command, just force scan complete to mac80211 */
    mutex_lock(&il->mutex);
    il_force_scan_end(il);
    mutex_unlock(&il->mutex);
}

u16
il_fill_probe_req(struct il_priv *il, struct ieee80211_mgmt *frame,
          const u8 *ta, const u8 *ies, int ie_len, int left)
{
    int len = 0;
    u8 *pos = NULL;

    /* Make sure there is enough space for the probe request,
     * two mandatory IEs and the data */
    left -= 24;
    if (left < 0)
        return 0;

    frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
    eth_broadcast_addr(frame->da);
    memcpy(frame->sa, ta, ETH_ALEN);
    eth_broadcast_addr(frame->bssid);
    frame->seq_ctrl = 0;

    len += 24;

    /* ...next IE... */
    pos = &frame->u.probe_req.variable[0];

    /* fill in our indirect SSID IE */
    left -= 2;
    if (left < 0)
        return 0;
    *pos++ = WLAN_EID_SSID;
    *pos++ = 0;

    len += 2;

    if (WARN_ON(left < ie_len))
        return len;

    if (ies && ie_len) {
        memcpy(pos, ies, ie_len);
        len += ie_len;
    }

    return (u16) len;
}
EXPORT_SYMBOL(il_fill_probe_req);

static void
il_bg_abort_scan(struct work_struct *work)
{
    struct il_priv *il = container_of(work, struct il_priv, abort_scan);

    D_SCAN("Abort scan work\n");

    /* We keep scan_check work queued in case when firmware will not
     * report back scan completed notification */
    mutex_lock(&il->mutex);
    il_scan_cancel_timeout(il, 200);
    mutex_unlock(&il->mutex);
}

static void
il_bg_scan_completed(struct work_struct *work)
{
    struct il_priv *il = container_of(work, struct il_priv, scan_completed);
    bool aborted;

    D_SCAN("Completed scan.\n");

    cancel_delayed_work(&il->scan_check);

    mutex_lock(&il->mutex);

    aborted = test_and_clear_bit(S_SCAN_ABORTING, &il->status);
    if (aborted)
        D_SCAN("Aborted scan completed.\n");

    if (!test_and_clear_bit(S_SCANNING, &il->status)) {
        D_SCAN("Scan already completed.\n");
        goto out_settings;
    }

    il_complete_scan(il, aborted);

out_settings:
    /* Can we still talk to firmware ? */
    if (!il_is_ready_rf(il))
        goto out;

    /*
     * We do not commit power settings while scan is pending,
     * do it now if the settings changed.
     */
    il_power_set_mode(il, &il->power_data.sleep_cmd_next, false);
    il_set_tx_power(il, il->tx_power_next, false);

    il->ops->post_scan(il);

out:
    mutex_unlock(&il->mutex);
}

void
il_setup_scan_deferred_work(struct il_priv *il)
{
    INIT_WORK(&il->scan_completed, il_bg_scan_completed);
    INIT_WORK(&il->abort_scan, il_bg_abort_scan);
    INIT_DELAYED_WORK(&il->scan_check, il_bg_scan_check);
}
EXPORT_SYMBOL(il_setup_scan_deferred_work);

void
il_cancel_scan_deferred_work(struct il_priv *il)
{
    cancel_work_sync(&il->abort_scan);
    cancel_work_sync(&il->scan_completed);

    if (cancel_delayed_work_sync(&il->scan_check)) {
        mutex_lock(&il->mutex);
        il_force_scan_end(il);
        mutex_unlock(&il->mutex);
    }
}
EXPORT_SYMBOL(il_cancel_scan_deferred_work);

/* il->sta_lock must be held */
static void
il_sta_ucode_activate(struct il_priv *il, u8 sta_id)
{

    if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE))
        IL_ERR("ACTIVATE a non DRIVER active station id %u addr %pM\n",
               sta_id, il->stations[sta_id].sta.sta.addr);

    if (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) {
        D_ASSOC("STA id %u addr %pM already present"
            " in uCode (according to driver)\n", sta_id,
            il->stations[sta_id].sta.sta.addr);
    } else {
        il->stations[sta_id].used |= IL_STA_UCODE_ACTIVE;
        D_ASSOC("Added STA id %u addr %pM to uCode\n", sta_id,
            il->stations[sta_id].sta.sta.addr);
    }
}

static int
il_process_add_sta_resp(struct il_priv *il, struct il_addsta_cmd *addsta,
            struct il_rx_pkt *pkt, bool sync)
{
    u8 sta_id = addsta->sta.sta_id;
    unsigned long flags;
    int ret = -EIO;

    if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
        IL_ERR("Bad return from C_ADD_STA (0x%08X)\n", pkt->hdr.flags);
        return ret;
    }

    D_INFO("Processing response for adding station %u\n", sta_id);

    spin_lock_irqsave(&il->sta_lock, flags);

    switch (pkt->u.add_sta.status) {
    case ADD_STA_SUCCESS_MSK:
        D_INFO("C_ADD_STA PASSED\n");
        il_sta_ucode_activate(il, sta_id);
        ret = 0;
        break;
    case ADD_STA_NO_ROOM_IN_TBL:
        IL_ERR("Adding station %d failed, no room in table.\n", sta_id);
        break;
    case ADD_STA_NO_BLOCK_ACK_RESOURCE:
        IL_ERR("Adding station %d failed, no block ack resource.\n",
               sta_id);
        break;
    case ADD_STA_MODIFY_NON_EXIST_STA:
        IL_ERR("Attempting to modify non-existing station %d\n",
               sta_id);
        break;
    default:
        D_ASSOC("Received C_ADD_STA:(0x%08X)\n", pkt->u.add_sta.status);
        break;
    }

    D_INFO("%s station id %u addr %pM\n",
           il->stations[sta_id].sta.mode ==
           STA_CONTROL_MODIFY_MSK ? "Modified" : "Added", sta_id,
           il->stations[sta_id].sta.sta.addr);

    /*
     * XXX: The MAC address in the command buffer is often changed from
     * the original sent to the device. That is, the MAC address
     * written to the command buffer often is not the same MAC address
     * read from the command buffer when the command returns. This
     * issue has not yet been resolved and this debugging is left to
     * observe the problem.
     */
    D_INFO("%s station according to cmd buffer %pM\n",
           il->stations[sta_id].sta.mode ==
           STA_CONTROL_MODIFY_MSK ? "Modified" : "Added", addsta->sta.addr);
    spin_unlock_irqrestore(&il->sta_lock, flags);

    return ret;
}

static void
il_add_sta_callback(struct il_priv *il, struct il_device_cmd *cmd,
            struct il_rx_pkt *pkt)
{
    struct il_addsta_cmd *addsta = (struct il_addsta_cmd *)cmd->cmd.payload;

    il_process_add_sta_resp(il, addsta, pkt, false);

}

int
il_send_add_sta(struct il_priv *il, struct il_addsta_cmd *sta, u8 flags)
{
    struct il_rx_pkt *pkt = NULL;
    int ret = 0;
    u8 data[sizeof(*sta)];
    struct il_host_cmd cmd = {
        .id = C_ADD_STA,
        .flags = flags,
        .data = data,
    };
    u8 sta_id __maybe_unused = sta->sta.sta_id;

    D_INFO("Adding sta %u (%pM) %ssynchronously\n", sta_id, sta->sta.addr,
           flags & CMD_ASYNC ? "a" : "");

    if (flags & CMD_ASYNC)
        cmd.callback = il_add_sta_callback;
    else {
        cmd.flags |= CMD_WANT_SKB;
        might_sleep();
    }

    cmd.len = il->ops->build_addsta_hcmd(sta, data);
    ret = il_send_cmd(il, &cmd);

    if (ret || (flags & CMD_ASYNC))
        return ret;

    if (ret == 0) {
        pkt = (struct il_rx_pkt *)cmd.reply_page;
        ret = il_process_add_sta_resp(il, sta, pkt, true);
    }
    il_free_pages(il, cmd.reply_page);

    return ret;
}
EXPORT_SYMBOL(il_send_add_sta);

static void
il_set_ht_add_station(struct il_priv *il, u8 idx, struct ieee80211_sta *sta)
{
    struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
    __le32 sta_flags;
    u8 mimo_ps_mode;

    if (!sta || !sta_ht_inf->ht_supported)
        goto done;

    mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
    D_ASSOC("spatial multiplexing power save mode: %s\n",
        (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ? "static" :
        (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ? "dynamic" :
        "disabled");

    sta_flags = il->stations[idx].sta.station_flags;

    sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);

    switch (mimo_ps_mode) {
    case WLAN_HT_CAP_SM_PS_STATIC:
        sta_flags |= STA_FLG_MIMO_DIS_MSK;
        break;
    case WLAN_HT_CAP_SM_PS_DYNAMIC:
        sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
        break;
    case WLAN_HT_CAP_SM_PS_DISABLED:
        break;
    default:
        IL_WARN("Invalid MIMO PS mode %d\n", mimo_ps_mode);
        break;
    }

    sta_flags |=
        cpu_to_le32((u32) sta_ht_inf->
            ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);

    sta_flags |=
        cpu_to_le32((u32) sta_ht_inf->
            ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);

    if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
        sta_flags |= STA_FLG_HT40_EN_MSK;
    else
        sta_flags &= ~STA_FLG_HT40_EN_MSK;

    il->stations[idx].sta.station_flags = sta_flags;
done:
    return;
}

u8
il_prep_station(struct il_priv *il, const u8 *addr, bool is_ap,
        struct ieee80211_sta *sta)
{
    struct il_station_entry *station;
    int i;
    u8 sta_id = IL_INVALID_STATION;
    u16 rate;

    if (is_ap)
        sta_id = IL_AP_ID;
    else if (is_broadcast_ether_addr(addr))
        sta_id = il->hw_params.bcast_id;
    else
        for (i = IL_STA_ID; i < il->hw_params.max_stations; i++) {
            if (ether_addr_equal(il->stations[i].sta.sta.addr,
                         addr)) {
                sta_id = i;
                break;
            }

            if (!il->stations[i].used &&
                sta_id == IL_INVALID_STATION)
                sta_id = i;
        }

    /*
     * These two conditions have the same outcome, but keep them
     * separate
     */
    if (unlikely(sta_id == IL_INVALID_STATION))
        return sta_id;

    /*
     * uCode is not able to deal with multiple requests to add a
     * station. Keep track if one is in progress so that we do not send
     * another.
     */
    if (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {
        D_INFO("STA %d already in process of being added.\n", sta_id);
        return sta_id;
    }

    if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&
        (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) &&
        ether_addr_equal(il->stations[sta_id].sta.sta.addr, addr)) {
        D_ASSOC("STA %d (%pM) already added, not adding again.\n",
            sta_id, addr);
        return sta_id;
    }

    station = &il->stations[sta_id];
    station->used = IL_STA_DRIVER_ACTIVE;
    D_ASSOC("Add STA to driver ID %d: %pM\n", sta_id, addr);
    il->num_stations++;

    /* Set up the C_ADD_STA command to send to device */
    memset(&station->sta, 0, sizeof(struct il_addsta_cmd));
    memcpy(station->sta.sta.addr, addr, ETH_ALEN);
    station->sta.mode = 0;
    station->sta.sta.sta_id = sta_id;
    station->sta.station_flags = 0;

    /*
     * OK to call unconditionally, since local stations (IBSS BSSID
     * STA and broadcast STA) pass in a NULL sta, and mac80211
     * doesn't allow HT IBSS.
     */
    il_set_ht_add_station(il, sta_id, sta);

    /* 3945 only */
    rate = (il->band == IEEE80211_BAND_5GHZ) ? RATE_6M_PLCP : RATE_1M_PLCP;
    /* Turn on both antennas for the station... */
    station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);

    return sta_id;

}
EXPORT_SYMBOL_GPL(il_prep_station);

#define STA_WAIT_TIMEOUT (HZ/2)

int
il_add_station_common(struct il_priv *il, const u8 *addr, bool is_ap,
              struct ieee80211_sta *sta, u8 *sta_id_r)
{
    unsigned long flags_spin;
    int ret = 0;
    u8 sta_id;
    struct il_addsta_cmd sta_cmd;

    *sta_id_r = 0;
    spin_lock_irqsave(&il->sta_lock, flags_spin);
    sta_id = il_prep_station(il, addr, is_ap, sta);
    if (sta_id == IL_INVALID_STATION) {
        IL_ERR("Unable to prepare station %pM for addition\n", addr);
        spin_unlock_irqrestore(&il->sta_lock, flags_spin);
        return -EINVAL;
    }

    /*
     * uCode is not able to deal with multiple requests to add a
     * station. Keep track if one is in progress so that we do not send
     * another.
     */
    if (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {
        D_INFO("STA %d already in process of being added.\n", sta_id);
        spin_unlock_irqrestore(&il->sta_lock, flags_spin);
        return -EEXIST;
    }

    if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&
        (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {
        D_ASSOC("STA %d (%pM) already added, not adding again.\n",
            sta_id, addr);
        spin_unlock_irqrestore(&il->sta_lock, flags_spin);
        return -EEXIST;
    }

    il->stations[sta_id].used |= IL_STA_UCODE_INPROGRESS;
    memcpy(&sta_cmd, &il->stations[sta_id].sta,
           sizeof(struct il_addsta_cmd));
    spin_unlock_irqrestore(&il->sta_lock, flags_spin);

    /* Add station to device's station table */
    ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);
    if (ret) {
        spin_lock_irqsave(&il->sta_lock, flags_spin);
        IL_ERR("Adding station %pM failed.\n",
               il->stations[sta_id].sta.sta.addr);
        il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;
        il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
        spin_unlock_irqrestore(&il->sta_lock, flags_spin);
    }
    *sta_id_r = sta_id;
    return ret;
}
EXPORT_SYMBOL(il_add_station_common);

static void
il_sta_ucode_deactivate(struct il_priv *il, u8 sta_id)
{
    /* Ucode must be active and driver must be non active */
    if ((il->stations[sta_id].
         used & (IL_STA_UCODE_ACTIVE | IL_STA_DRIVER_ACTIVE)) !=
        IL_STA_UCODE_ACTIVE)
        IL_ERR("removed non active STA %u\n", sta_id);

    il->stations[sta_id].used &= ~IL_STA_UCODE_ACTIVE;

    memset(&il->stations[sta_id], 0, sizeof(struct il_station_entry));
    D_ASSOC("Removed STA %u\n", sta_id);
}

static int
il_send_remove_station(struct il_priv *il, const u8 * addr, int sta_id,
               bool temporary)
{
    struct il_rx_pkt *pkt;
    int ret;

    unsigned long flags_spin;
    struct il_rem_sta_cmd rm_sta_cmd;

    struct il_host_cmd cmd = {
        .id = C_REM_STA,
        .len = sizeof(struct il_rem_sta_cmd),
        .flags = CMD_SYNC,
        .data = &rm_sta_cmd,
    };

    memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
    rm_sta_cmd.num_sta = 1;
    memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);

    cmd.flags |= CMD_WANT_SKB;

    ret = il_send_cmd(il, &cmd);

    if (ret)
        return ret;

    pkt = (struct il_rx_pkt *)cmd.reply_page;
    if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
        IL_ERR("Bad return from C_REM_STA (0x%08X)\n", pkt->hdr.flags);
        ret = -EIO;
    }

    if (!ret) {
        switch (pkt->u.rem_sta.status) {
        case REM_STA_SUCCESS_MSK:
            if (!temporary) {
                spin_lock_irqsave(&il->sta_lock, flags_spin);
                il_sta_ucode_deactivate(il, sta_id);
                spin_unlock_irqrestore(&il->sta_lock,
                               flags_spin);
            }
            D_ASSOC("C_REM_STA PASSED\n");
            break;
        default:
            ret = -EIO;
            IL_ERR("C_REM_STA failed\n");
            break;
        }
    }
    il_free_pages(il, cmd.reply_page);

    return ret;
}

int
il_remove_station(struct il_priv *il, const u8 sta_id, const u8 * addr)
{
    unsigned long flags;

    if (!il_is_ready(il)) {
        D_INFO("Unable to remove station %pM, device not ready.\n",
               addr);
        /*
         * It is typical for stations to be removed when we are
         * going down. Return success since device will be down
         * soon anyway
         */
        return 0;
    }

    D_ASSOC("Removing STA from driver:%d  %pM\n", sta_id, addr);

    if (WARN_ON(sta_id == IL_INVALID_STATION))
        return -EINVAL;

    spin_lock_irqsave(&il->sta_lock, flags);

    if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE)) {
        D_INFO("Removing %pM but non DRIVER active\n", addr);
        goto out_err;
    }

    if (!(il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {
        D_INFO("Removing %pM but non UCODE active\n", addr);
        goto out_err;
    }

    if (il->stations[sta_id].used & IL_STA_LOCAL) {
        kfree(il->stations[sta_id].lq);
        il->stations[sta_id].lq = NULL;
    }

    il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;

    il->num_stations--;

    BUG_ON(il->num_stations < 0);

    spin_unlock_irqrestore(&il->sta_lock, flags);

    return il_send_remove_station(il, addr, sta_id, false);
out_err:
    spin_unlock_irqrestore(&il->sta_lock, flags);
    return -EINVAL;
}
EXPORT_SYMBOL_GPL(il_remove_station);

void
il_clear_ucode_stations(struct il_priv *il)
{
    int i;
    unsigned long flags_spin;
    bool cleared = false;

    D_INFO("Clearing ucode stations in driver\n");

    spin_lock_irqsave(&il->sta_lock, flags_spin);
    for (i = 0; i < il->hw_params.max_stations; i++) {
        if (il->stations[i].used & IL_STA_UCODE_ACTIVE) {
            D_INFO("Clearing ucode active for station %d\n", i);
            il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;
            cleared = true;
        }
    }
    spin_unlock_irqrestore(&il->sta_lock, flags_spin);

    if (!cleared)
        D_INFO("No active stations found to be cleared\n");
}
EXPORT_SYMBOL(il_clear_ucode_stations);

void
il_restore_stations(struct il_priv *il)
{
    struct il_addsta_cmd sta_cmd;
    struct il_link_quality_cmd lq;
    unsigned long flags_spin;
    int i;
    bool found = false;
    int ret;
    bool send_lq;

    if (!il_is_ready(il)) {
        D_INFO("Not ready yet, not restoring any stations.\n");
        return;
    }

    D_ASSOC("Restoring all known stations ... start.\n");
    spin_lock_irqsave(&il->sta_lock, flags_spin);
    for (i = 0; i < il->hw_params.max_stations; i++) {
        if ((il->stations[i].used & IL_STA_DRIVER_ACTIVE) &&
            !(il->stations[i].used & IL_STA_UCODE_ACTIVE)) {
            D_ASSOC("Restoring sta %pM\n",
                il->stations[i].sta.sta.addr);
            il->stations[i].sta.mode = 0;
            il->stations[i].used |= IL_STA_UCODE_INPROGRESS;
            found = true;
        }
    }

    for (i = 0; i < il->hw_params.max_stations; i++) {
        if ((il->stations[i].used & IL_STA_UCODE_INPROGRESS)) {
            memcpy(&sta_cmd, &il->stations[i].sta,
                   sizeof(struct il_addsta_cmd));
            send_lq = false;
            if (il->stations[i].lq) {
                memcpy(&lq, il->stations[i].lq,
                       sizeof(struct il_link_quality_cmd));
                send_lq = true;
            }
            spin_unlock_irqrestore(&il->sta_lock, flags_spin);
            ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);
            if (ret) {
                spin_lock_irqsave(&il->sta_lock, flags_spin);
                IL_ERR("Adding station %pM failed.\n",
                       il->stations[i].sta.sta.addr);
                il->stations[i].used &= ~IL_STA_DRIVER_ACTIVE;
                il->stations[i].used &=
                    ~IL_STA_UCODE_INPROGRESS;
                spin_unlock_irqrestore(&il->sta_lock,
                               flags_spin);
            }
            /*
             * Rate scaling has already been initialized, send
             * current LQ command
             */
            if (send_lq)
                il_send_lq_cmd(il, &lq, CMD_SYNC, true);
            spin_lock_irqsave(&il->sta_lock, flags_spin);
            il->stations[i].used &= ~IL_STA_UCODE_INPROGRESS;
        }
    }

    spin_unlock_irqrestore(&il->sta_lock, flags_spin);
    if (!found)
        D_INFO("Restoring all known stations"
               " .... no stations to be restored.\n");
    else
        D_INFO("Restoring all known stations" " .... complete.\n");
}
EXPORT_SYMBOL(il_restore_stations);

int
il_get_free_ucode_key_idx(struct il_priv *il)
{
    int i;

    for (i = 0; i < il->sta_key_max_num; i++)
        if (!test_and_set_bit(i, &il->ucode_key_table))
            return i;

    return WEP_INVALID_OFFSET;
}
EXPORT_SYMBOL(il_get_free_ucode_key_idx);

void
il_dealloc_bcast_stations(struct il_priv *il)
{
    unsigned long flags;
    int i;

    spin_lock_irqsave(&il->sta_lock, flags);
    for (i = 0; i < il->hw_params.max_stations; i++) {
        if (!(il->stations[i].used & IL_STA_BCAST))
            continue;

        il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;
        il->num_stations--;
        BUG_ON(il->num_stations < 0);
        kfree(il->stations[i].lq);
        il->stations[i].lq = NULL;
    }
    spin_unlock_irqrestore(&il->sta_lock, flags);
}
EXPORT_SYMBOL_GPL(il_dealloc_bcast_stations);

#ifdef CONFIG_IWLEGACY_DEBUG
static void
il_dump_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq)
{
    int i;
    D_RATE("lq station id 0x%x\n", lq->sta_id);
    D_RATE("lq ant 0x%X 0x%X\n", lq->general_params.single_stream_ant_msk,
           lq->general_params.dual_stream_ant_msk);

    for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
        D_RATE("lq idx %d 0x%X\n", i, lq->rs_table[i].rate_n_flags);
}
#else
static inline void
il_dump_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq)
{
}
#endif

static bool
il_is_lq_table_valid(struct il_priv *il, struct il_link_quality_cmd *lq)
{
    int i;

    if (il->ht.enabled)
        return true;

    D_INFO("Channel %u is not an HT channel\n", il->active.channel);
    for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
        if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
            D_INFO("idx %d of LQ expects HT channel\n", i);
            return false;
        }
    }
    return true;
}

int
il_send_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq,
           u8 flags, bool init)
{
    int ret = 0;
    unsigned long flags_spin;

    struct il_host_cmd cmd = {
        .id = C_TX_LINK_QUALITY_CMD,
        .len = sizeof(struct il_link_quality_cmd),
        .flags = flags,
        .data = lq,
    };

    if (WARN_ON(lq->sta_id == IL_INVALID_STATION))
        return -EINVAL;

    spin_lock_irqsave(&il->sta_lock, flags_spin);
    if (!(il->stations[lq->sta_id].used & IL_STA_DRIVER_ACTIVE)) {
        spin_unlock_irqrestore(&il->sta_lock, flags_spin);
        return -EINVAL;
    }
    spin_unlock_irqrestore(&il->sta_lock, flags_spin);

    il_dump_lq_cmd(il, lq);
    BUG_ON(init && (cmd.flags & CMD_ASYNC));

    if (il_is_lq_table_valid(il, lq))
        ret = il_send_cmd(il, &cmd);
    else
        ret = -EINVAL;

    if (cmd.flags & CMD_ASYNC)
        return ret;

    if (init) {
        D_INFO("init LQ command complete,"
               " clearing sta addition status for sta %d\n",
               lq->sta_id);
        spin_lock_irqsave(&il->sta_lock, flags_spin);
        il->stations[lq->sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
        spin_unlock_irqrestore(&il->sta_lock, flags_spin);
    }
    return ret;
}
EXPORT_SYMBOL(il_send_lq_cmd);

int
il_mac_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
          struct ieee80211_sta *sta)
{
    struct il_priv *il = hw->priv;
    struct il_station_priv_common *sta_common = (void *)sta->drv_priv;
    int ret;

    mutex_lock(&il->mutex);
    D_MAC80211("enter station %pM\n", sta->addr);

    ret = il_remove_station(il, sta_common->sta_id, sta->addr);
    if (ret)
        IL_ERR("Error removing station %pM\n", sta->addr);

    D_MAC80211("leave ret %d\n", ret);
    mutex_unlock(&il->mutex);

    return ret;
}
EXPORT_SYMBOL(il_mac_sta_remove);

/************************** RX-FUNCTIONS ****************************/
/*
 * Rx theory of operation
 *
 * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
 * each of which point to Receive Buffers to be filled by the NIC.  These get
 * used not only for Rx frames, but for any command response or notification
 * from the NIC.  The driver and NIC manage the Rx buffers by means
 * of idxes into the circular buffer.
 *
 * Rx Queue Indexes
 * The host/firmware share two idx registers for managing the Rx buffers.
 *
 * The READ idx maps to the first position that the firmware may be writing
 * to -- the driver can read up to (but not including) this position and get
 * good data.
 * The READ idx is managed by the firmware once the card is enabled.
 *
 * The WRITE idx maps to the last position the driver has read from -- the
 * position preceding WRITE is the last slot the firmware can place a packet.
 *
 * The queue is empty (no good data) if WRITE = READ - 1, and is full if
 * WRITE = READ.
 *
 * During initialization, the host sets up the READ queue position to the first
 * IDX position, and WRITE to the last (READ - 1 wrapped)
 *
 * When the firmware places a packet in a buffer, it will advance the READ idx
 * and fire the RX interrupt.  The driver can then query the READ idx and
 * process as many packets as possible, moving the WRITE idx forward as it
 * resets the Rx queue buffers with new memory.
 *
 * The management in the driver is as follows:
 * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
 *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
 *   to replenish the iwl->rxq->rx_free.
 * + In il_rx_replenish (scheduled) if 'processed' != 'read' then the
 *   iwl->rxq is replenished and the READ IDX is updated (updating the
 *   'processed' and 'read' driver idxes as well)
 * + A received packet is processed and handed to the kernel network stack,
 *   detached from the iwl->rxq.  The driver 'processed' idx is updated.
 * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
 *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
 *   IDX is not incremented and iwl->status(RX_STALLED) is set.  If there
 *   were enough free buffers and RX_STALLED is set it is cleared.
 *
 *
 * Driver sequence:
 *
 * il_rx_queue_alloc()   Allocates rx_free
 * il_rx_replenish()     Replenishes rx_free list from rx_used, and calls
 *                            il_rx_queue_restock
 * il_rx_queue_restock() Moves available buffers from rx_free into Rx
 *                            queue, updates firmware pointers, and updates
 *                            the WRITE idx.  If insufficient rx_free buffers
 *                            are available, schedules il_rx_replenish
 *
 * -- enable interrupts --
 * ISR - il_rx()         Detach il_rx_bufs from pool up to the
 *                            READ IDX, detaching the SKB from the pool.
 *                            Moves the packet buffer from queue to rx_used.
 *                            Calls il_rx_queue_restock to refill any empty
 *                            slots.
 * ...
 *
 */

int
il_rx_queue_space(const struct il_rx_queue *q)
{
    int s = q->read - q->write;
    if (s <= 0)
        s += RX_QUEUE_SIZE;
    /* keep some buffer to not confuse full and empty queue */
    s -= 2;
    if (s < 0)
        s = 0;
    return s;
}
EXPORT_SYMBOL(il_rx_queue_space);

void
il_rx_queue_update_write_ptr(struct il_priv *il, struct il_rx_queue *q)
{
    unsigned long flags;
    u32 rx_wrt_ptr_reg = il->hw_params.rx_wrt_ptr_reg;
    u32 reg;

    spin_lock_irqsave(&q->lock, flags);

    if (q->need_update == 0)
        goto exit_unlock;

    /* If power-saving is in use, make sure device is awake */
    if (test_bit(S_POWER_PMI, &il->status)) {
        reg = _il_rd(il, CSR_UCODE_DRV_GP1);

        if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
            D_INFO("Rx queue requesting wakeup," " GP1 = 0x%x\n",
                   reg);
            il_set_bit(il, CSR_GP_CNTRL,
                   CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
            goto exit_unlock;
        }

        q->write_actual = (q->write & ~0x7);
        il_wr(il, rx_wrt_ptr_reg, q->write_actual);

        /* Else device is assumed to be awake */
    } else {
        /* Device expects a multiple of 8 */
        q->write_actual = (q->write & ~0x7);
        il_wr(il, rx_wrt_ptr_reg, q->write_actual);
    }

    q->need_update = 0;

exit_unlock:
    spin_unlock_irqrestore(&q->lock, flags);
}
EXPORT_SYMBOL(il_rx_queue_update_write_ptr);

int
il_rx_queue_alloc(struct il_priv *il)
{
    struct il_rx_queue *rxq = &il->rxq;
    struct device *dev = &il->pci_dev->dev;
    int i;

    spin_lock_init(&rxq->lock);
    INIT_LIST_HEAD(&rxq->rx_free);
    INIT_LIST_HEAD(&rxq->rx_used);

    /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
    rxq->bd =
        dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->bd_dma,
                   GFP_KERNEL);
    if (!rxq->bd)
        goto err_bd;

    rxq->rb_stts =
        dma_alloc_coherent(dev, sizeof(struct il_rb_status),
                   &rxq->rb_stts_dma, GFP_KERNEL);
    if (!rxq->rb_stts)
        goto err_rb;

    /* Fill the rx_used queue with _all_ of the Rx buffers */
    for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
        list_add_tail(&rxq->pool[i].list, &rxq->rx_used);

    /* Set us so that we have processed and used all buffers, but have
     * not restocked the Rx queue with fresh buffers */
    rxq->read = rxq->write = 0;
    rxq->write_actual = 0;
    rxq->free_count = 0;
    rxq->need_update = 0;
    return 0;

err_rb:
    dma_free_coherent(&il->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
              rxq->bd_dma);
err_bd:
    return -ENOMEM;
}
EXPORT_SYMBOL(il_rx_queue_alloc);

void
il_hdl_spectrum_measurement(struct il_priv *il, struct il_rx_buf *rxb)
{
    struct il_rx_pkt *pkt = rxb_addr(rxb);
    struct il_spectrum_notification *report = &(pkt->u.spectrum_notif);

    if (!report->state) {
        D_11H("Spectrum Measure Notification: Start\n");
        return;
    }

    memcpy(&il->measure_report, report, sizeof(*report));
    il->measurement_status |= MEASUREMENT_READY;
}
EXPORT_SYMBOL(il_hdl_spectrum_measurement);

/*
 * returns non-zero if packet should be dropped
 */
int
il_set_decrypted_flag(struct il_priv *il, struct ieee80211_hdr *hdr,
              u32 decrypt_res, struct ieee80211_rx_status *stats)
{
    u16 fc = le16_to_cpu(hdr->frame_control);

    /*
     * All contexts have the same setting here due to it being
     * a module parameter, so OK to check any context.
     */
    if (il->active.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
        return 0;

    if (!(fc & IEEE80211_FCTL_PROTECTED))
        return 0;

    D_RX("decrypt_res:0x%x\n", decrypt_res);
    switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
    case RX_RES_STATUS_SEC_TYPE_TKIP:
        /* The uCode has got a bad phase 1 Key, pushes the packet.
         * Decryption will be done in SW. */
        if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
            RX_RES_STATUS_BAD_KEY_TTAK)
            break;

    case RX_RES_STATUS_SEC_TYPE_WEP:
        if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
            RX_RES_STATUS_BAD_ICV_MIC) {
            /* bad ICV, the packet is destroyed since the
             * decryption is inplace, drop it */
            D_RX("Packet destroyed\n");
            return -1;
        }
    case RX_RES_STATUS_SEC_TYPE_CCMP:
        if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
            RX_RES_STATUS_DECRYPT_OK) {
            D_RX("hw decrypt successfully!!!\n");
            stats->flag |= RX_FLAG_DECRYPTED;
        }
        break;

    default:
        break;
    }
    return 0;
}
EXPORT_SYMBOL(il_set_decrypted_flag);

void
il_txq_update_write_ptr(struct il_priv *il, struct il_tx_queue *txq)
{
    u32 reg = 0;
    int txq_id = txq->q.id;

    if (txq->need_update == 0)
        return;

    /* if we're trying to save power */
    if (test_bit(S_POWER_PMI, &il->status)) {
        /* wake up nic if it's powered down ...
         * uCode will wake up, and interrupt us again, so next
         * time we'll skip this part. */
        reg = _il_rd(il, CSR_UCODE_DRV_GP1);

        if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
            D_INFO("Tx queue %d requesting wakeup," " GP1 = 0x%x\n",
                   txq_id, reg);
            il_set_bit(il, CSR_GP_CNTRL,
                   CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
            return;
        }

        il_wr(il, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8));

        /*
         * else not in power-save mode,
         * uCode will never sleep when we're
         * trying to tx (during RFKILL, we're not trying to tx).
         */
    } else
        _il_wr(il, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8));
    txq->need_update = 0;
}
EXPORT_SYMBOL(il_txq_update_write_ptr);

void
il_tx_queue_unmap(struct il_priv *il, int txq_id)
{
    struct il_tx_queue *txq = &il->txq[txq_id];
    struct il_queue *q = &txq->q;

    if (q->n_bd == 0)
        return;

    while (q->write_ptr != q->read_ptr) {
        il->ops->txq_free_tfd(il, txq);
        q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
    }
}
EXPORT_SYMBOL(il_tx_queue_unmap);

void
il_tx_queue_free(struct il_priv *il, int txq_id)
{
    struct il_tx_queue *txq = &il->txq[txq_id];
    struct device *dev = &il->pci_dev->dev;
    int i;

    il_tx_queue_unmap(il, txq_id);

    /* De-alloc array of command/tx buffers */
    for (i = 0; i < TFD_TX_CMD_SLOTS; i++)
        kfree(txq->cmd[i]);

    /* De-alloc circular buffer of TFDs */
    if (txq->q.n_bd)
        dma_free_coherent(dev, il->hw_params.tfd_size * txq->q.n_bd,
                  txq->tfds, txq->q.dma_addr);

    /* De-alloc array of per-TFD driver data */
    kfree(txq->skbs);
    txq->skbs = NULL;

    /* deallocate arrays */
    kfree(txq->cmd);
    kfree(txq->meta);
    txq->cmd = NULL;
    txq->meta = NULL;

    /* 0-fill queue descriptor structure */
    memset(txq, 0, sizeof(*txq));
}
EXPORT_SYMBOL(il_tx_queue_free);

void
il_cmd_queue_unmap(struct il_priv *il)
{
    struct il_tx_queue *txq = &il->txq[il->cmd_queue];
    struct il_queue *q = &txq->q;
    int i;

    if (q->n_bd == 0)
        return;

    while (q->read_ptr != q->write_ptr) {
        i = il_get_cmd_idx(q, q->read_ptr, 0);

        if (txq->meta[i].flags & CMD_MAPPED) {
            pci_unmap_single(il->pci_dev,
                     dma_unmap_addr(&txq->meta[i], mapping),
                     dma_unmap_len(&txq->meta[i], len),
                     PCI_DMA_BIDIRECTIONAL);
            txq->meta[i].flags = 0;
        }

        q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
    }

    i = q->n_win;
    if (txq->meta[i].flags & CMD_MAPPED) {
        pci_unmap_single(il->pci_dev,
                 dma_unmap_addr(&txq->meta[i], mapping),
                 dma_unmap_len(&txq->meta[i], len),
                 PCI_DMA_BIDIRECTIONAL);
        txq->meta[i].flags = 0;
    }
}
EXPORT_SYMBOL(il_cmd_queue_unmap);

void
il_cmd_queue_free(struct il_priv *il)
{
    struct il_tx_queue *txq = &il->txq[il->cmd_queue];
    struct device *dev = &il->pci_dev->dev;
    int i;

    il_cmd_queue_unmap(il);

    /* De-alloc array of command/tx buffers */
    for (i = 0; i <= TFD_CMD_SLOTS; i++)
        kfree(txq->cmd[i]);

    /* De-alloc circular buffer of TFDs */
    if (txq->q.n_bd)
        dma_free_coherent(dev, il->hw_params.tfd_size * txq->q.n_bd,
                  txq->tfds, txq->q.dma_addr);

    /* deallocate arrays */
    kfree(txq->cmd);
    kfree(txq->meta);
    txq->cmd = NULL;
    txq->meta = NULL;

    /* 0-fill queue descriptor structure */
    memset(txq, 0, sizeof(*txq));
}
EXPORT_SYMBOL(il_cmd_queue_free);

/*************** DMA-QUEUE-GENERAL-FUNCTIONS  *****
 * DMA services
 *
 * Theory of operation
 *
 * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
 * of buffer descriptors, each of which points to one or more data buffers for
 * the device to read from or fill.  Driver and device exchange status of each
 * queue via "read" and "write" pointers.  Driver keeps minimum of 2 empty
 * entries in each circular buffer, to protect against confusing empty and full
 * queue states.
 *
 * The device reads or writes the data in the queues via the device's several
 * DMA/FIFO channels.  Each queue is mapped to a single DMA channel.
 *
 * For Tx queue, there are low mark and high mark limits. If, after queuing
 * the packet for Tx, free space become < low mark, Tx queue stopped. When
 * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
 * Tx queue resumed.
 *
 * See more detailed info in 4965.h.
 ***************************************************/

int
il_queue_space(const struct il_queue *q)
{
    int s = q->read_ptr - q->write_ptr;

    if (q->read_ptr > q->write_ptr)
        s -= q->n_bd;

    if (s <= 0)
        s += q->n_win;
    /* keep some reserve to not confuse empty and full situations */
    s -= 2;
    if (s < 0)
        s = 0;
    return s;
}
EXPORT_SYMBOL(il_queue_space);


static int
il_queue_init(struct il_priv *il, struct il_queue *q, int slots, u32 id)
{
    /*
     * TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
     * il_queue_inc_wrap and il_queue_dec_wrap are broken.
     */
    BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
    /* FIXME: remove q->n_bd */
    q->n_bd = TFD_QUEUE_SIZE_MAX;

    q->n_win = slots;
    q->id = id;

    /* slots_must be power-of-two size, otherwise
     * il_get_cmd_idx is broken. */
    BUG_ON(!is_power_of_2(slots));

    q->low_mark = q->n_win / 4;
    if (q->low_mark < 4)
        q->low_mark = 4;

    q->high_mark = q->n_win / 8;
    if (q->high_mark < 2)
        q->high_mark = 2;

    q->write_ptr = q->read_ptr = 0;

    return 0;
}

static int
il_tx_queue_alloc(struct il_priv *il, struct il_tx_queue *txq, u32 id)
{
    struct device *dev = &il->pci_dev->dev;
    size_t tfd_sz = il->hw_params.tfd_size * TFD_QUEUE_SIZE_MAX;

    /* Driver ilate data, only for Tx (not command) queues,
     * not shared with device. */
    if (id != il->cmd_queue) {
        txq->skbs = kcalloc(TFD_QUEUE_SIZE_MAX, sizeof(struct skb *),
                    GFP_KERNEL);
        if (!txq->skbs) {
            IL_ERR("Fail to alloc skbs\n");
            goto error;
        }
    } else
        txq->skbs = NULL;

    /* Circular buffer of transmit frame descriptors (TFDs),
     * shared with device */
    txq->tfds =
        dma_alloc_coherent(dev, tfd_sz, &txq->q.dma_addr, GFP_KERNEL);
    if (!txq->tfds) {
        IL_ERR("Fail to alloc TFDs\n");
        goto error;
    }
    txq->q.id = id;

    return 0;

error:
    kfree(txq->skbs);
    txq->skbs = NULL;

    return -ENOMEM;
}

int
il_tx_queue_init(struct il_priv *il, u32 txq_id)
{
    int i, len, ret;
    int slots, actual_slots;
    struct il_tx_queue *txq = &il->txq[txq_id];

    /*
     * Alloc buffer array for commands (Tx or other types of commands).
     * For the command queue (#4/#9), allocate command space + one big
     * command for scan, since scan command is very huge; the system will
     * not have two scans at the same time, so only one is needed.
     * For normal Tx queues (all other queues), no super-size command
     * space is needed.
     */
    if (txq_id == il->cmd_queue) {
        slots = TFD_CMD_SLOTS;
        actual_slots = slots + 1;
    } else {
        slots = TFD_TX_CMD_SLOTS;
        actual_slots = slots;
    }

    txq->meta =
        kzalloc(sizeof(struct il_cmd_meta) * actual_slots, GFP_KERNEL);
    txq->cmd =
        kzalloc(sizeof(struct il_device_cmd *) * actual_slots, GFP_KERNEL);

    if (!txq->meta || !txq->cmd)
        goto out_free_arrays;

    len = sizeof(struct il_device_cmd);
    for (i = 0; i < actual_slots; i++) {
        /* only happens for cmd queue */
        if (i == slots)
            len = IL_MAX_CMD_SIZE;

        txq->cmd[i] = kmalloc(len, GFP_KERNEL);
        if (!txq->cmd[i])
            goto err;
    }

    /* Alloc driver data array and TFD circular buffer */
    ret = il_tx_queue_alloc(il, txq, txq_id);
    if (ret)
        goto err;

    txq->need_update = 0;

    /*
     * For the default queues 0-3, set up the swq_id
     * already -- all others need to get one later
     * (if they need one at all).
     */
    if (txq_id < 4)
        il_set_swq_id(txq, txq_id, txq_id);

    /* Initialize queue's high/low-water marks, and head/tail idxes */
    il_queue_init(il, &txq->q, slots, txq_id);

    /* Tell device where to find queue */
    il->ops->txq_init(il, txq);

    return 0;
err:
    for (i = 0; i < actual_slots; i++)
        kfree(txq->cmd[i]);
out_free_arrays:
    kfree(txq->meta);
    kfree(txq->cmd);

    return -ENOMEM;
}
EXPORT_SYMBOL(il_tx_queue_init);

void
il_tx_queue_reset(struct il_priv *il, u32 txq_id)
{
    int slots, actual_slots;
    struct il_tx_queue *txq = &il->txq[txq_id];

    if (txq_id == il->cmd_queue) {
        slots = TFD_CMD_SLOTS;
        actual_slots = TFD_CMD_SLOTS + 1;
    } else {
        slots = TFD_TX_CMD_SLOTS;
        actual_slots = TFD_TX_CMD_SLOTS;
    }

    memset(txq->meta, 0, sizeof(struct il_cmd_meta) * actual_slots);
    txq->need_update = 0;

    /* Initialize queue's high/low-water marks, and head/tail idxes */
    il_queue_init(il, &txq->q, slots, txq_id);

    /* Tell device where to find queue */
    il->ops->txq_init(il, txq);
}
EXPORT_SYMBOL(il_tx_queue_reset);

/*************** HOST COMMAND QUEUE FUNCTIONS   *****/

int
il_enqueue_hcmd(struct il_priv *il, struct il_host_cmd *cmd)
{
    struct il_tx_queue *txq = &il->txq[il->cmd_queue];
    struct il_queue *q = &txq->q;
    struct il_device_cmd *out_cmd;
    struct il_cmd_meta *out_meta;
    dma_addr_t phys_addr;
    unsigned long flags;
    int len;
    u32 idx;
    u16 fix_size;

    cmd->len = il->ops->get_hcmd_size(cmd->id, cmd->len);
    fix_size = (u16) (cmd->len + sizeof(out_cmd->hdr));

    /* If any of the command structures end up being larger than
     * the TFD_MAX_PAYLOAD_SIZE, and it sent as a 'small' command then
     * we will need to increase the size of the TFD entries
     * Also, check to see if command buffer should not exceed the size
     * of device_cmd and max_cmd_size. */
    BUG_ON((fix_size > TFD_MAX_PAYLOAD_SIZE) &&
           !(cmd->flags & CMD_SIZE_HUGE));
    BUG_ON(fix_size > IL_MAX_CMD_SIZE);

    if (il_is_rfkill(il) || il_is_ctkill(il)) {
        IL_WARN("Not sending command - %s KILL\n",
            il_is_rfkill(il) ? "RF" : "CT");
        return -EIO;
    }

    spin_lock_irqsave(&il->hcmd_lock, flags);

    if (il_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
        spin_unlock_irqrestore(&il->hcmd_lock, flags);

        IL_ERR("Restarting adapter due to command queue full\n");
        queue_work(il->workqueue, &il->restart);
        return -ENOSPC;
    }

    idx = il_get_cmd_idx(q, q->write_ptr, cmd->flags & CMD_SIZE_HUGE);
    out_cmd = txq->cmd[idx];
    out_meta = &txq->meta[idx];

    if (WARN_ON(out_meta->flags & CMD_MAPPED)) {
        spin_unlock_irqrestore(&il->hcmd_lock, flags);
        return -ENOSPC;
    }

    memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */
    out_meta->flags = cmd->flags | CMD_MAPPED;
    if (cmd->flags & CMD_WANT_SKB)
        out_meta->source = cmd;
    if (cmd->flags & CMD_ASYNC)
        out_meta->callback = cmd->callback;

    out_cmd->hdr.cmd = cmd->id;
    memcpy(&out_cmd->cmd.payload, cmd->data, cmd->len);

    /* At this point, the out_cmd now has all of the incoming cmd
     * information */

    out_cmd->hdr.flags = 0;
    out_cmd->hdr.sequence =
        cpu_to_le16(QUEUE_TO_SEQ(il->cmd_queue) | IDX_TO_SEQ(q->write_ptr));
    if (cmd->flags & CMD_SIZE_HUGE)
        out_cmd->hdr.sequence |= SEQ_HUGE_FRAME;
    len = sizeof(struct il_device_cmd);
    if (idx == TFD_CMD_SLOTS)
        len = IL_MAX_CMD_SIZE;

#ifdef CONFIG_IWLEGACY_DEBUG
    switch (out_cmd->hdr.cmd) {
    case C_TX_LINK_QUALITY_CMD:
    case C_SENSITIVITY:
        D_HC_DUMP("Sending command %s (#%x), seq: 0x%04X, "
              "%d bytes at %d[%d]:%d\n",
              il_get_cmd_string(out_cmd->hdr.cmd), out_cmd->hdr.cmd,
              le16_to_cpu(out_cmd->hdr.sequence), fix_size,
              q->write_ptr, idx, il->cmd_queue);
        break;
    default:
        D_HC("Sending command %s (#%x), seq: 0x%04X, "
             "%d bytes at %d[%d]:%d\n",
             il_get_cmd_string(out_cmd->hdr.cmd), out_cmd->hdr.cmd,
             le16_to_cpu(out_cmd->hdr.sequence), fix_size, q->write_ptr,
             idx, il->cmd_queue);
    }
#endif
    txq->need_update = 1;

    if (il->ops->txq_update_byte_cnt_tbl)
        /* Set up entry in queue's byte count circular buffer */
        il->ops->txq_update_byte_cnt_tbl(il, txq, 0);

    phys_addr =
        pci_map_single(il->pci_dev, &out_cmd->hdr, fix_size,
               PCI_DMA_BIDIRECTIONAL);
    dma_unmap_addr_set(out_meta, mapping, phys_addr);
    dma_unmap_len_set(out_meta, len, fix_size);

    il->ops->txq_attach_buf_to_tfd(il, txq, phys_addr, fix_size, 1,
                        U32_PAD(cmd->len));

    /* Increment and update queue's write idx */
    q->write_ptr = il_queue_inc_wrap(q->write_ptr, q->n_bd);
    il_txq_update_write_ptr(il, txq);

    spin_unlock_irqrestore(&il->hcmd_lock, flags);
    return idx;
}

static void
il_hcmd_queue_reclaim(struct il_priv *il, int txq_id, int idx, int cmd_idx)
{
    struct il_tx_queue *txq = &il->txq[txq_id];
    struct il_queue *q = &txq->q;
    int nfreed = 0;

    if (idx >= q->n_bd || il_queue_used(q, idx) == 0) {
        IL_ERR("Read idx for DMA queue txq id (%d), idx %d, "
               "is out of range [0-%d] %d %d.\n", txq_id, idx, q->n_bd,
               q->write_ptr, q->read_ptr);
        return;
    }

    for (idx = il_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx;
         q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd)) {

        if (nfreed++ > 0) {
            IL_ERR("HCMD skipped: idx (%d) %d %d\n", idx,
                   q->write_ptr, q->read_ptr);
            queue_work(il->workqueue, &il->restart);
        }

    }
}

void
il_tx_cmd_complete(struct il_priv *il, struct il_rx_buf *rxb)
{
    struct il_rx_pkt *pkt = rxb_addr(rxb);
    u16 sequence = le16_to_cpu(pkt->hdr.sequence);
    int txq_id = SEQ_TO_QUEUE(sequence);
    int idx = SEQ_TO_IDX(sequence);
    int cmd_idx;
    bool huge = !!(pkt->hdr.sequence & SEQ_HUGE_FRAME);
    struct il_device_cmd *cmd;
    struct il_cmd_meta *meta;
    struct il_tx_queue *txq = &il->txq[il->cmd_queue];
    unsigned long flags;

    /* If a Tx command is being handled and it isn't in the actual
     * command queue then there a command routing bug has been introduced
     * in the queue management code. */
    if (WARN
        (txq_id != il->cmd_queue,
         "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
         txq_id, il->cmd_queue, sequence, il->txq[il->cmd_queue].q.read_ptr,
         il->txq[il->cmd_queue].q.write_ptr)) {
        il_print_hex_error(il, pkt, 32);
        return;
    }

    cmd_idx = il_get_cmd_idx(&txq->q, idx, huge);
    cmd = txq->cmd[cmd_idx];
    meta = &txq->meta[cmd_idx];

    txq->time_stamp = jiffies;

    pci_unmap_single(il->pci_dev, dma_unmap_addr(meta, mapping),
             dma_unmap_len(meta, len), PCI_DMA_BIDIRECTIONAL);

    /* Input error checking is done when commands are added to queue. */
    if (meta->flags & CMD_WANT_SKB) {
        meta->source->reply_page = (unsigned long)rxb_addr(rxb);
        rxb->page = NULL;
    } else if (meta->callback)
        meta->callback(il, cmd, pkt);

    spin_lock_irqsave(&il->hcmd_lock, flags);

    il_hcmd_queue_reclaim(il, txq_id, idx, cmd_idx);

    if (!(meta->flags & CMD_ASYNC)) {
        clear_bit(S_HCMD_ACTIVE, &il->status);
        D_INFO("Clearing HCMD_ACTIVE for command %s\n",
               il_get_cmd_string(cmd->hdr.cmd));
        wake_up(&il->wait_command_queue);
    }

    /* Mark as unmapped */
    meta->flags = 0;

    spin_unlock_irqrestore(&il->hcmd_lock, flags);
}
EXPORT_SYMBOL(il_tx_cmd_complete);

MODULE_DESCRIPTION("iwl-legacy: common functions for 3945 and 4965");
MODULE_VERSION(IWLWIFI_VERSION);
MODULE_AUTHOR(DRV_COPYRIGHT " " DRV_AUTHOR);
MODULE_LICENSE("GPL");

/*
 * set bt_coex_active to true, uCode will do kill/defer
 * every time the priority line is asserted (BT is sending signals on the
 * priority line in the PCIx).
 * set bt_coex_active to false, uCode will ignore the BT activity and
 * perform the normal operation
 *
 * User might experience transmit issue on some platform due to WiFi/BT
 * co-exist problem. The possible behaviors are:
 *   Able to scan and finding all the available AP
 *   Not able to associate with any AP
 * On those platforms, WiFi communication can be restored by set
 * "bt_coex_active" module parameter to "false"
 *
 * default: bt_coex_active = true (BT_COEX_ENABLE)
 */
static bool bt_coex_active = true;
module_param(bt_coex_active, bool, S_IRUGO);
MODULE_PARM_DESC(bt_coex_active, "enable wifi/bluetooth co-exist");

u32 il_debug_level;
EXPORT_SYMBOL(il_debug_level);

const u8 il_bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
EXPORT_SYMBOL(il_bcast_addr);

#define MAX_BIT_RATE_40_MHZ 150 /* Mbps */
#define MAX_BIT_RATE_20_MHZ 72  /* Mbps */
static void
il_init_ht_hw_capab(const struct il_priv *il,
            struct ieee80211_sta_ht_cap *ht_info,
            enum ieee80211_band band)
{
    u16 max_bit_rate = 0;
    u8 rx_chains_num = il->hw_params.rx_chains_num;
    u8 tx_chains_num = il->hw_params.tx_chains_num;

    ht_info->cap = 0;
    memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));

    ht_info->ht_supported = true;

    ht_info->cap |= IEEE80211_HT_CAP_SGI_20;
    max_bit_rate = MAX_BIT_RATE_20_MHZ;
    if (il->hw_params.ht40_channel & BIT(band)) {
        ht_info->cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
        ht_info->cap |= IEEE80211_HT_CAP_SGI_40;
        ht_info->mcs.rx_mask[4] = 0x01;
        max_bit_rate = MAX_BIT_RATE_40_MHZ;
    }

    if (il->cfg->mod_params->amsdu_size_8K)
        ht_info->cap |= IEEE80211_HT_CAP_MAX_AMSDU;

    ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
    ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;

    ht_info->mcs.rx_mask[0] = 0xFF;
    if (rx_chains_num >= 2)
        ht_info->mcs.rx_mask[1] = 0xFF;
    if (rx_chains_num >= 3)
        ht_info->mcs.rx_mask[2] = 0xFF;

    /* Highest supported Rx data rate */
    max_bit_rate *= rx_chains_num;
    WARN_ON(max_bit_rate & ~IEEE80211_HT_MCS_RX_HIGHEST_MASK);
    ht_info->mcs.rx_highest = cpu_to_le16(max_bit_rate);

    /* Tx MCS capabilities */
    ht_info->mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
    if (tx_chains_num != rx_chains_num) {
        ht_info->mcs.tx_params |= IEEE80211_HT_MCS_TX_RX_DIFF;
        ht_info->mcs.tx_params |=
            ((tx_chains_num -
              1) << IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT);
    }
}

int
il_init_geos(struct il_priv *il)
{
    struct il_channel_info *ch;
    struct ieee80211_supported_band *sband;
    struct ieee80211_channel *channels;
    struct ieee80211_channel *geo_ch;
    struct ieee80211_rate *rates;
    int i = 0;
    s8 max_tx_power = 0;

    if (il->bands[IEEE80211_BAND_2GHZ].n_bitrates ||
        il->bands[IEEE80211_BAND_5GHZ].n_bitrates) {
        D_INFO("Geography modes already initialized.\n");
        set_bit(S_GEO_CONFIGURED, &il->status);
        return 0;
    }

    channels =
        kzalloc(sizeof(struct ieee80211_channel) * il->channel_count,
            GFP_KERNEL);
    if (!channels)
        return -ENOMEM;

    rates =
        kzalloc((sizeof(struct ieee80211_rate) * RATE_COUNT_LEGACY),
            GFP_KERNEL);
    if (!rates) {
        kfree(channels);
        return -ENOMEM;
    }

    /* 5.2GHz channels start after the 2.4GHz channels */
    sband = &il->bands[IEEE80211_BAND_5GHZ];
    sband->channels = &channels[ARRAY_SIZE(il_eeprom_band_1)];
    /* just OFDM */
    sband->bitrates = &rates[IL_FIRST_OFDM_RATE];
    sband->n_bitrates = RATE_COUNT_LEGACY - IL_FIRST_OFDM_RATE;

    if (il->cfg->sku & IL_SKU_N)
        il_init_ht_hw_capab(il, &sband->ht_cap, IEEE80211_BAND_5GHZ);

    sband = &il->bands[IEEE80211_BAND_2GHZ];
    sband->channels = channels;
    /* OFDM & CCK */
    sband->bitrates = rates;
    sband->n_bitrates = RATE_COUNT_LEGACY;

    if (il->cfg->sku & IL_SKU_N)
        il_init_ht_hw_capab(il, &sband->ht_cap, IEEE80211_BAND_2GHZ);

    il->ieee_channels = channels;
    il->ieee_rates = rates;

    for (i = 0; i < il->channel_count; i++) {
        ch = &il->channel_info[i];

        if (!il_is_channel_valid(ch))
            continue;

        sband = &il->bands[ch->band];

        geo_ch = &sband->channels[sband->n_channels++];

        geo_ch->center_freq =
            ieee80211_channel_to_frequency(ch->channel, ch->band);
        geo_ch->max_power = ch->max_power_avg;
        geo_ch->max_antenna_gain = 0xff;
        geo_ch->hw_value = ch->channel;

        if (il_is_channel_valid(ch)) {
            if (!(ch->flags & EEPROM_CHANNEL_IBSS))
                geo_ch->flags |= IEEE80211_CHAN_NO_IBSS;

            if (!(ch->flags & EEPROM_CHANNEL_ACTIVE))
                geo_ch->flags |= IEEE80211_CHAN_PASSIVE_SCAN;

            if (ch->flags & EEPROM_CHANNEL_RADAR)
                geo_ch->flags |= IEEE80211_CHAN_RADAR;

            geo_ch->flags |= ch->ht40_extension_channel;

            if (ch->max_power_avg > max_tx_power)
                max_tx_power = ch->max_power_avg;
        } else {
            geo_ch->flags |= IEEE80211_CHAN_DISABLED;
        }

        D_INFO("Channel %d Freq=%d[%sGHz] %s flag=0x%X\n", ch->channel,
               geo_ch->center_freq,
               il_is_channel_a_band(ch) ? "5.2" : "2.4",
               geo_ch->
               flags & IEEE80211_CHAN_DISABLED ? "restricted" : "valid",
               geo_ch->flags);
    }

    il->tx_power_device_lmt = max_tx_power;
    il->tx_power_user_lmt = max_tx_power;
    il->tx_power_next = max_tx_power;

    if (il->bands[IEEE80211_BAND_5GHZ].n_channels == 0 &&
        (il->cfg->sku & IL_SKU_A)) {
        IL_INFO("Incorrectly detected BG card as ABG. "
            "Please send your PCI ID 0x%04X:0x%04X to maintainer.\n",
            il->pci_dev->device, il->pci_dev->subsystem_device);
        il->cfg->sku &= ~IL_SKU_A;
    }

    IL_INFO("Tunable channels: %d 802.11bg, %d 802.11a channels\n",
        il->bands[IEEE80211_BAND_2GHZ].n_channels,
        il->bands[IEEE80211_BAND_5GHZ].n_channels);

    set_bit(S_GEO_CONFIGURED, &il->status);

    return 0;
}
EXPORT_SYMBOL(il_init_geos);

/*
 * il_free_geos - undo allocations in il_init_geos
 */
void
il_free_geos(struct il_priv *il)
{
    kfree(il->ieee_channels);
    kfree(il->ieee_rates);
    clear_bit(S_GEO_CONFIGURED, &il->status);
}
EXPORT_SYMBOL(il_free_geos);

static bool
il_is_channel_extension(struct il_priv *il, enum ieee80211_band band,
            u16 channel, u8 extension_chan_offset)
{
    const struct il_channel_info *ch_info;

    ch_info = il_get_channel_info(il, band, channel);
    if (!il_is_channel_valid(ch_info))
        return false;

    if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_ABOVE)
        return !(ch_info->
             ht40_extension_channel & IEEE80211_CHAN_NO_HT40PLUS);
    else if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_BELOW)
        return !(ch_info->
             ht40_extension_channel & IEEE80211_CHAN_NO_HT40MINUS);

    return false;
}

bool
il_is_ht40_tx_allowed(struct il_priv *il, struct ieee80211_sta_ht_cap *ht_cap)
{
    if (!il->ht.enabled || !il->ht.is_40mhz)
        return false;

    /*
     * We do not check for IEEE80211_HT_CAP_SUP_WIDTH_20_40
     * the bit will not set if it is pure 40MHz case
     */
    if (ht_cap && !ht_cap->ht_supported)
        return false;

#ifdef CONFIG_IWLEGACY_DEBUGFS
    if (il->disable_ht40)
        return false;
#endif

    return il_is_channel_extension(il, il->band,
                       le16_to_cpu(il->staging.channel),
                       il->ht.extension_chan_offset);
}
EXPORT_SYMBOL(il_is_ht40_tx_allowed);

static u16
il_adjust_beacon_interval(u16 beacon_val, u16 max_beacon_val)
{
    u16 new_val;
    u16 beacon_factor;

    /*
     * If mac80211 hasn't given us a beacon interval, program
     * the default into the device.
     */
    if (!beacon_val)
        return DEFAULT_BEACON_INTERVAL;

    /*
     * If the beacon interval we obtained from the peer
     * is too large, we'll have to wake up more often
     * (and in IBSS case, we'll beacon too much)
     *
     * For example, if max_beacon_val is 4096, and the
     * requested beacon interval is 7000, we'll have to
     * use 3500 to be able to wake up on the beacons.
     *
     * This could badly influence beacon detection stats.
     */

    beacon_factor = (beacon_val + max_beacon_val) / max_beacon_val;
    new_val = beacon_val / beacon_factor;

    if (!new_val)
        new_val = max_beacon_val;

    return new_val;
}

int
il_send_rxon_timing(struct il_priv *il)
{
    u64 tsf;
    s32 interval_tm, rem;
    struct ieee80211_conf *conf = NULL;
    u16 beacon_int;
    struct ieee80211_vif *vif = il->vif;

    conf = &il->hw->conf;

    lockdep_assert_held(&il->mutex);

    memset(&il->timing, 0, sizeof(struct il_rxon_time_cmd));

    il->timing.timestamp = cpu_to_le64(il->timestamp);
    il->timing.listen_interval = cpu_to_le16(conf->listen_interval);

    beacon_int = vif ? vif->bss_conf.beacon_int : 0;

    /*
     * TODO: For IBSS we need to get atim_win from mac80211,
     *       for now just always use 0
     */
    il->timing.atim_win = 0;

    beacon_int =
        il_adjust_beacon_interval(beacon_int,
                      il->hw_params.max_beacon_itrvl *
                      TIME_UNIT);
    il->timing.beacon_interval = cpu_to_le16(beacon_int);

    tsf = il->timestamp;    /* tsf is modifed by do_div: copy it */
    interval_tm = beacon_int * TIME_UNIT;
    rem = do_div(tsf, interval_tm);
    il->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);

    il->timing.dtim_period = vif ? (vif->bss_conf.dtim_period ? : 1) : 1;

    D_ASSOC("beacon interval %d beacon timer %d beacon tim %d\n",
        le16_to_cpu(il->timing.beacon_interval),
        le32_to_cpu(il->timing.beacon_init_val),
        le16_to_cpu(il->timing.atim_win));

    return il_send_cmd_pdu(il, C_RXON_TIMING, sizeof(il->timing),
                   &il->timing);
}
EXPORT_SYMBOL(il_send_rxon_timing);

void
il_set_rxon_hwcrypto(struct il_priv *il, int hw_decrypt)
{
    struct il_rxon_cmd *rxon = &il->staging;

    if (hw_decrypt)
        rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
    else
        rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;

}
EXPORT_SYMBOL(il_set_rxon_hwcrypto);

/* validate RXON structure is valid */
int
il_check_rxon_cmd(struct il_priv *il)
{
    struct il_rxon_cmd *rxon = &il->staging;
    bool error = false;

    if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
        if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
            IL_WARN("check 2.4G: wrong narrow\n");
            error = true;
        }
        if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
            IL_WARN("check 2.4G: wrong radar\n");
            error = true;
        }
    } else {
        if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
            IL_WARN("check 5.2G: not short slot!\n");
            error = true;
        }
        if (rxon->flags & RXON_FLG_CCK_MSK) {
            IL_WARN("check 5.2G: CCK!\n");
            error = true;
        }
    }
    if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
        IL_WARN("mac/bssid mcast!\n");
        error = true;
    }

    /* make sure basic rates 6Mbps and 1Mbps are supported */
    if ((rxon->ofdm_basic_rates & RATE_6M_MASK) == 0 &&
        (rxon->cck_basic_rates & RATE_1M_MASK) == 0) {
        IL_WARN("neither 1 nor 6 are basic\n");
        error = true;
    }

    if (le16_to_cpu(rxon->assoc_id) > 2007) {
        IL_WARN("aid > 2007\n");
        error = true;
    }

    if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) ==
        (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
        IL_WARN("CCK and short slot\n");
        error = true;
    }

    if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) ==
        (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
        IL_WARN("CCK and auto detect");
        error = true;
    }

    if ((rxon->
         flags & (RXON_FLG_AUTO_DETECT_MSK | RXON_FLG_TGG_PROTECT_MSK)) ==
        RXON_FLG_TGG_PROTECT_MSK) {
        IL_WARN("TGg but no auto-detect\n");
        error = true;
    }

    if (error)
        IL_WARN("Tuning to channel %d\n", le16_to_cpu(rxon->channel));

    if (error) {
        IL_ERR("Invalid RXON\n");
        return -EINVAL;
    }
    return 0;
}
EXPORT_SYMBOL(il_check_rxon_cmd);

int
il_full_rxon_required(struct il_priv *il)
{
    const struct il_rxon_cmd *staging = &il->staging;
    const struct il_rxon_cmd *active = &il->active;

#define CHK(cond)                           \
    if ((cond)) {                           \
        D_INFO("need full RXON - " #cond "\n"); \
        return 1;                       \
    }

#define CHK_NEQ(c1, c2)                     \
    if ((c1) != (c2)) {                 \
        D_INFO("need full RXON - "  \
                   #c1 " != " #c2 " - %d != %d\n",  \
                   (c1), (c2));         \
        return 1;                   \
    }

    /* These items are only settable from the full RXON command */
    CHK(!il_is_associated(il));
    CHK(!ether_addr_equal(staging->bssid_addr, active->bssid_addr));
    CHK(!ether_addr_equal(staging->node_addr, active->node_addr));
    CHK(!ether_addr_equal(staging->wlap_bssid_addr,
                  active->wlap_bssid_addr));
    CHK_NEQ(staging->dev_type, active->dev_type);
    CHK_NEQ(staging->channel, active->channel);
    CHK_NEQ(staging->air_propagation, active->air_propagation);
    CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
        active->ofdm_ht_single_stream_basic_rates);
    CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
        active->ofdm_ht_dual_stream_basic_rates);
    CHK_NEQ(staging->assoc_id, active->assoc_id);

    /* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
     * be updated with the RXON_ASSOC command -- however only some
     * flag transitions are allowed using RXON_ASSOC */

    /* Check if we are not switching bands */
    CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
        active->flags & RXON_FLG_BAND_24G_MSK);

    /* Check if we are switching association toggle */
    CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
        active->filter_flags & RXON_FILTER_ASSOC_MSK);

#undef CHK
#undef CHK_NEQ

    return 0;
}
EXPORT_SYMBOL(il_full_rxon_required);

u8
il_get_lowest_plcp(struct il_priv *il)
{
    /*
     * Assign the lowest rate -- should really get this from
     * the beacon skb from mac80211.
     */
    if (il->staging.flags & RXON_FLG_BAND_24G_MSK)
        return RATE_1M_PLCP;
    else
        return RATE_6M_PLCP;
}
EXPORT_SYMBOL(il_get_lowest_plcp);

static void
_il_set_rxon_ht(struct il_priv *il, struct il_ht_config *ht_conf)
{
    struct il_rxon_cmd *rxon = &il->staging;

    if (!il->ht.enabled) {
        rxon->flags &=
            ~(RXON_FLG_CHANNEL_MODE_MSK |
              RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK | RXON_FLG_HT40_PROT_MSK
              | RXON_FLG_HT_PROT_MSK);
        return;
    }

    rxon->flags |=
        cpu_to_le32(il->ht.protection << RXON_FLG_HT_OPERATING_MODE_POS);

    /* Set up channel bandwidth:
     * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
    /* clear the HT channel mode before set the mode */
    rxon->flags &=
        ~(RXON_FLG_CHANNEL_MODE_MSK | RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
    if (il_is_ht40_tx_allowed(il, NULL)) {
        /* pure ht40 */
        if (il->ht.protection == IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
            rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
            /* Note: control channel is opposite of extension channel */
            switch (il->ht.extension_chan_offset) {
            case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
                rxon->flags &=
                    ~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
                break;
            case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
                rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
                break;
            }
        } else {
            /* Note: control channel is opposite of extension channel */
            switch (il->ht.extension_chan_offset) {
            case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
                rxon->flags &=
                    ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
                rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
                break;
            case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
                rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
                rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
                break;
            case IEEE80211_HT_PARAM_CHA_SEC_NONE:
            default:
                /* channel location only valid if in Mixed mode */
                IL_ERR("invalid extension channel offset\n");
                break;
            }
        }
    } else {
        rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
    }

    if (il->ops->set_rxon_chain)
        il->ops->set_rxon_chain(il);

    D_ASSOC("rxon flags 0x%X operation mode :0x%X "
        "extension channel offset 0x%x\n", le32_to_cpu(rxon->flags),
        il->ht.protection, il->ht.extension_chan_offset);
}

void
il_set_rxon_ht(struct il_priv *il, struct il_ht_config *ht_conf)
{
    _il_set_rxon_ht(il, ht_conf);
}
EXPORT_SYMBOL(il_set_rxon_ht);

/* Return valid, unused, channel for a passive scan to reset the RF */
u8
il_get_single_channel_number(struct il_priv *il, enum ieee80211_band band)
{
    const struct il_channel_info *ch_info;
    int i;
    u8 channel = 0;
    u8 min, max;

    if (band == IEEE80211_BAND_5GHZ) {
        min = 14;
        max = il->channel_count;
    } else {
        min = 0;
        max = 14;
    }

    for (i = min; i < max; i++) {
        channel = il->channel_info[i].channel;
        if (channel == le16_to_cpu(il->staging.channel))
            continue;

        ch_info = il_get_channel_info(il, band, channel);
        if (il_is_channel_valid(ch_info))
            break;
    }

    return channel;
}
EXPORT_SYMBOL(il_get_single_channel_number);

int
il_set_rxon_channel(struct il_priv *il, struct ieee80211_channel *ch)
{
    enum ieee80211_band band = ch->band;
    u16 channel = ch->hw_value;

    if (le16_to_cpu(il->staging.channel) == channel && il->band == band)
        return 0;

    il->staging.channel = cpu_to_le16(channel);
    if (band == IEEE80211_BAND_5GHZ)
        il->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
    else
        il->staging.flags |= RXON_FLG_BAND_24G_MSK;

    il->band = band;

    D_INFO("Staging channel set to %d [%d]\n", channel, band);

    return 0;
}
EXPORT_SYMBOL(il_set_rxon_channel);

void
il_set_flags_for_band(struct il_priv *il, enum ieee80211_band band,
              struct ieee80211_vif *vif)
{
    if (band == IEEE80211_BAND_5GHZ) {
        il->staging.flags &=
            ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK |
              RXON_FLG_CCK_MSK);
        il->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
    } else {
        /* Copied from il_post_associate() */
        if (vif && vif->bss_conf.use_short_slot)
            il->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
        else
            il->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;

        il->staging.flags |= RXON_FLG_BAND_24G_MSK;
        il->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
        il->staging.flags &= ~RXON_FLG_CCK_MSK;
    }
}
EXPORT_SYMBOL(il_set_flags_for_band);

/*
 * initialize rxon structure with default values from eeprom
 */
void
il_connection_init_rx_config(struct il_priv *il)
{
    const struct il_channel_info *ch_info;

    memset(&il->staging, 0, sizeof(il->staging));

    if (!il->vif) {
        il->staging.dev_type = RXON_DEV_TYPE_ESS;
    } else if (il->vif->type == NL80211_IFTYPE_STATION) {
        il->staging.dev_type = RXON_DEV_TYPE_ESS;
        il->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
    } else if (il->vif->type == NL80211_IFTYPE_ADHOC) {
        il->staging.dev_type = RXON_DEV_TYPE_IBSS;
        il->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
        il->staging.filter_flags =
            RXON_FILTER_BCON_AWARE_MSK | RXON_FILTER_ACCEPT_GRP_MSK;
    } else {
        IL_ERR("Unsupported interface type %d\n", il->vif->type);
        return;
    }

#if 0
    /* TODO:  Figure out when short_preamble would be set and cache from
     * that */
    if (!hw_to_local(il->hw)->short_preamble)
        il->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
    else
        il->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
#endif

    ch_info =
        il_get_channel_info(il, il->band, le16_to_cpu(il->active.channel));

    if (!ch_info)
        ch_info = &il->channel_info[0];

    il->staging.channel = cpu_to_le16(ch_info->channel);
    il->band = ch_info->band;

    il_set_flags_for_band(il, il->band, il->vif);

    il->staging.ofdm_basic_rates =
        (IL_OFDM_RATES_MASK >> IL_FIRST_OFDM_RATE) & 0xFF;
    il->staging.cck_basic_rates =
        (IL_CCK_RATES_MASK >> IL_FIRST_CCK_RATE) & 0xF;

    /* clear both MIX and PURE40 mode flag */
    il->staging.flags &=
        ~(RXON_FLG_CHANNEL_MODE_MIXED | RXON_FLG_CHANNEL_MODE_PURE_40);
    if (il->vif)
        memcpy(il->staging.node_addr, il->vif->addr, ETH_ALEN);

    il->staging.ofdm_ht_single_stream_basic_rates = 0xff;
    il->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
}
EXPORT_SYMBOL(il_connection_init_rx_config);

void
il_set_rate(struct il_priv *il)
{
    const struct ieee80211_supported_band *hw = NULL;
    struct ieee80211_rate *rate;
    int i;

    hw = il_get_hw_mode(il, il->band);
    if (!hw) {
        IL_ERR("Failed to set rate: unable to get hw mode\n");
        return;
    }

    il->active_rate = 0;

    for (i = 0; i < hw->n_bitrates; i++) {
        rate = &(hw->bitrates[i]);
        if (rate->hw_value < RATE_COUNT_LEGACY)
            il->active_rate |= (1 << rate->hw_value);
    }

    D_RATE("Set active_rate = %0x\n", il->active_rate);

    il->staging.cck_basic_rates =
        (IL_CCK_BASIC_RATES_MASK >> IL_FIRST_CCK_RATE) & 0xF;

    il->staging.ofdm_basic_rates =
        (IL_OFDM_BASIC_RATES_MASK >> IL_FIRST_OFDM_RATE) & 0xFF;
}
EXPORT_SYMBOL(il_set_rate);

void
il_chswitch_done(struct il_priv *il, bool is_success)
{
    if (test_bit(S_EXIT_PENDING, &il->status))
        return;

    if (test_and_clear_bit(S_CHANNEL_SWITCH_PENDING, &il->status))
        ieee80211_chswitch_done(il->vif, is_success);
}
EXPORT_SYMBOL(il_chswitch_done);

void
il_hdl_csa(struct il_priv *il, struct il_rx_buf *rxb)
{
    struct il_rx_pkt *pkt = rxb_addr(rxb);
    struct il_csa_notification *csa = &(pkt->u.csa_notif);
    struct il_rxon_cmd *rxon = (void *)&il->active;

    if (!test_bit(S_CHANNEL_SWITCH_PENDING, &il->status))
        return;

    if (!le32_to_cpu(csa->status) && csa->channel == il->switch_channel) {
        rxon->channel = csa->channel;
        il->staging.channel = csa->channel;
        D_11H("CSA notif: channel %d\n", le16_to_cpu(csa->channel));
        il_chswitch_done(il, true);
    } else {
        IL_ERR("CSA notif (fail) : channel %d\n",
               le16_to_cpu(csa->channel));
        il_chswitch_done(il, false);
    }
}
EXPORT_SYMBOL(il_hdl_csa);

#ifdef CONFIG_IWLEGACY_DEBUG
void
il_print_rx_config_cmd(struct il_priv *il)
{
    struct il_rxon_cmd *rxon = &il->staging;

    D_RADIO("RX CONFIG:\n");
    il_print_hex_dump(il, IL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
    D_RADIO("u16 channel: 0x%x\n", le16_to_cpu(rxon->channel));
    D_RADIO("u32 flags: 0x%08X\n", le32_to_cpu(rxon->flags));
    D_RADIO("u32 filter_flags: 0x%08x\n", le32_to_cpu(rxon->filter_flags));
    D_RADIO("u8 dev_type: 0x%x\n", rxon->dev_type);
    D_RADIO("u8 ofdm_basic_rates: 0x%02x\n", rxon->ofdm_basic_rates);
    D_RADIO("u8 cck_basic_rates: 0x%02x\n", rxon->cck_basic_rates);
    D_RADIO("u8[6] node_addr: %pM\n", rxon->node_addr);
    D_RADIO("u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
    D_RADIO("u16 assoc_id: 0x%x\n", le16_to_cpu(rxon->assoc_id));
}
EXPORT_SYMBOL(il_print_rx_config_cmd);
#endif

void
il_irq_handle_error(struct il_priv *il)
{
    /* Set the FW error flag -- cleared on il_down */
    set_bit(S_FW_ERROR, &il->status);

    /* Cancel currently queued command. */
    clear_bit(S_HCMD_ACTIVE, &il->status);

    IL_ERR("Loaded firmware version: %s\n", il->hw->wiphy->fw_version);

    il->ops->dump_nic_error_log(il);
    if (il->ops->dump_fh)
        il->ops->dump_fh(il, NULL, false);
#ifdef CONFIG_IWLEGACY_DEBUG
    if (il_get_debug_level(il) & IL_DL_FW_ERRORS)
        il_print_rx_config_cmd(il);
#endif

    wake_up(&il->wait_command_queue);

    /* Keep the restart process from trying to send host
     * commands by clearing the INIT status bit */
    clear_bit(S_READY, &il->status);

    if (!test_bit(S_EXIT_PENDING, &il->status)) {
        IL_DBG(IL_DL_FW_ERRORS,
               "Restarting adapter due to uCode error.\n");

        if (il->cfg->mod_params->restart_fw)
            queue_work(il->workqueue, &il->restart);
    }
}
EXPORT_SYMBOL(il_irq_handle_error);

static int
_il_apm_stop_master(struct il_priv *il)
{
    int ret = 0;

    /* stop device's busmaster DMA activity */
    _il_set_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);

    ret =
        _il_poll_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_MASTER_DISABLED,
             CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
    if (ret < 0)
        IL_WARN("Master Disable Timed Out, 100 usec\n");

    D_INFO("stop master\n");

    return ret;
}

void
_il_apm_stop(struct il_priv *il)
{
    lockdep_assert_held(&il->reg_lock);

    D_INFO("Stop card, put in low power state\n");

    /* Stop device's DMA activity */
    _il_apm_stop_master(il);

    /* Reset the entire device */
    _il_set_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);

    udelay(10);

    /*
     * Clear "initialization complete" bit to move adapter from
     * D0A* (powered-up Active) --> D0U* (Uninitialized) state.
     */
    _il_clear_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
}
EXPORT_SYMBOL(_il_apm_stop);

void
il_apm_stop(struct il_priv *il)
{
    unsigned long flags;

    spin_lock_irqsave(&il->reg_lock, flags);
    _il_apm_stop(il);
    spin_unlock_irqrestore(&il->reg_lock, flags);
}
EXPORT_SYMBOL(il_apm_stop);

/*
 * Start up NIC's basic functionality after it has been reset
 * (e.g. after platform boot, or shutdown via il_apm_stop())
 * NOTE:  This does not load uCode nor start the embedded processor
 */
int
il_apm_init(struct il_priv *il)
{
    int ret = 0;
    u16 lctl;

    D_INFO("Init card's basic functions\n");

    /*
     * Use "set_bit" below rather than "write", to preserve any hardware
     * bits already set by default after reset.
     */

    /* Disable L0S exit timer (platform NMI Work/Around) */
    il_set_bit(il, CSR_GIO_CHICKEN_BITS,
           CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);

    /*
     * Disable L0s without affecting L1;
     *  don't wait for ICH L0s (ICH bug W/A)
     */
    il_set_bit(il, CSR_GIO_CHICKEN_BITS,
           CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);

    /* Set FH wait threshold to maximum (HW error during stress W/A) */
    il_set_bit(il, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL);

    /*
     * Enable HAP INTA (interrupt from management bus) to
     * wake device's PCI Express link L1a -> L0s
     * NOTE:  This is no-op for 3945 (non-existent bit)
     */
    il_set_bit(il, CSR_HW_IF_CONFIG_REG,
           CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);

    /*
     * HW bug W/A for instability in PCIe bus L0->L0S->L1 transition.
     * Check if BIOS (or OS) enabled L1-ASPM on this device.
     * If so (likely), disable L0S, so device moves directly L0->L1;
     *    costs negligible amount of power savings.
     * If not (unlikely), enable L0S, so there is at least some
     *    power savings, even without L1.
     */
    if (il->cfg->set_l0s) {
        lctl = il_pcie_link_ctl(il);
        if ((lctl & PCI_CFG_LINK_CTRL_VAL_L1_EN) ==
            PCI_CFG_LINK_CTRL_VAL_L1_EN) {
            /* L1-ASPM enabled; disable(!) L0S  */
            il_set_bit(il, CSR_GIO_REG,
                   CSR_GIO_REG_VAL_L0S_ENABLED);
            D_POWER("L1 Enabled; Disabling L0S\n");
        } else {
            /* L1-ASPM disabled; enable(!) L0S */
            il_clear_bit(il, CSR_GIO_REG,
                     CSR_GIO_REG_VAL_L0S_ENABLED);
            D_POWER("L1 Disabled; Enabling L0S\n");
        }
    }

    /* Configure analog phase-lock-loop before activating to D0A */
    if (il->cfg->pll_cfg_val)
        il_set_bit(il, CSR_ANA_PLL_CFG,
               il->cfg->pll_cfg_val);

    /*
     * Set "initialization complete" bit to move adapter from
     * D0U* --> D0A* (powered-up active) state.
     */
    il_set_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);

    /*
     * Wait for clock stabilization; once stabilized, access to
     * device-internal resources is supported, e.g. il_wr_prph()
     * and accesses to uCode SRAM.
     */
    ret =
        _il_poll_bit(il, CSR_GP_CNTRL,
             CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
             CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
    if (ret < 0) {
        D_INFO("Failed to init the card\n");
        goto out;
    }

    /*
     * Enable DMA and BSM (if used) clocks, wait for them to stabilize.
     * BSM (Boostrap State Machine) is only in 3945 and 4965.
     *
     * Write to "CLK_EN_REG"; "1" bits enable clocks, while "0" bits
     * do not disable clocks.  This preserves any hardware bits already
     * set by default in "CLK_CTRL_REG" after reset.
     */
    if (il->cfg->use_bsm)
        il_wr_prph(il, APMG_CLK_EN_REG,
               APMG_CLK_VAL_DMA_CLK_RQT | APMG_CLK_VAL_BSM_CLK_RQT);
    else
        il_wr_prph(il, APMG_CLK_EN_REG, APMG_CLK_VAL_DMA_CLK_RQT);
    udelay(20);

    /* Disable L1-Active */
    il_set_bits_prph(il, APMG_PCIDEV_STT_REG,
             APMG_PCIDEV_STT_VAL_L1_ACT_DIS);

out:
    return ret;
}
EXPORT_SYMBOL(il_apm_init);

int
il_set_tx_power(struct il_priv *il, s8 tx_power, bool force)
{
    int ret;
    s8 prev_tx_power;
    bool defer;

    lockdep_assert_held(&il->mutex);

    if (il->tx_power_user_lmt == tx_power && !force)
        return 0;

    if (!il->ops->send_tx_power)
        return -EOPNOTSUPP;

    /* 0 dBm mean 1 milliwatt */
    if (tx_power < 0) {
        IL_WARN("Requested user TXPOWER %d below 1 mW.\n", tx_power);
        return -EINVAL;
    }

    if (tx_power > il->tx_power_device_lmt) {
        IL_WARN("Requested user TXPOWER %d above upper limit %d.\n",
            tx_power, il->tx_power_device_lmt);
        return -EINVAL;
    }

    if (!il_is_ready_rf(il))
        return -EIO;

    /* scan complete and commit_rxon use tx_power_next value,
     * it always need to be updated for newest request */
    il->tx_power_next = tx_power;

    /* do not set tx power when scanning or channel changing */
    defer = test_bit(S_SCANNING, &il->status) ||
        memcmp(&il->active, &il->staging, sizeof(il->staging));
    if (defer && !force) {
        D_INFO("Deferring tx power set\n");
        return 0;
    }

    prev_tx_power = il->tx_power_user_lmt;
    il->tx_power_user_lmt = tx_power;

    ret = il->ops->send_tx_power(il);

    /* if fail to set tx_power, restore the orig. tx power */
    if (ret) {
        il->tx_power_user_lmt = prev_tx_power;
        il->tx_power_next = prev_tx_power;
    }
    return ret;
}
EXPORT_SYMBOL(il_set_tx_power);

void
il_send_bt_config(struct il_priv *il)
{
    struct il_bt_cmd bt_cmd = {
        .lead_time = BT_LEAD_TIME_DEF,
        .max_kill = BT_MAX_KILL_DEF,
        .kill_ack_mask = 0,
        .kill_cts_mask = 0,
    };

    if (!bt_coex_active)
        bt_cmd.flags = BT_COEX_DISABLE;
    else
        bt_cmd.flags = BT_COEX_ENABLE;

    D_INFO("BT coex %s\n",
           (bt_cmd.flags == BT_COEX_DISABLE) ? "disable" : "active");

    if (il_send_cmd_pdu(il, C_BT_CONFIG, sizeof(struct il_bt_cmd), &bt_cmd))
        IL_ERR("failed to send BT Coex Config\n");
}
EXPORT_SYMBOL(il_send_bt_config);

int
il_send_stats_request(struct il_priv *il, u8 flags, bool clear)
{
    struct il_stats_cmd stats_cmd = {
        .configuration_flags = clear ? IL_STATS_CONF_CLEAR_STATS : 0,
    };

    if (flags & CMD_ASYNC)
        return il_send_cmd_pdu_async(il, C_STATS, sizeof(struct il_stats_cmd),
                         &stats_cmd, NULL);
    else
        return il_send_cmd_pdu(il, C_STATS, sizeof(struct il_stats_cmd),
                       &stats_cmd);
}
EXPORT_SYMBOL(il_send_stats_request);

void
il_hdl_pm_sleep(struct il_priv *il, struct il_rx_buf *rxb)
{
#ifdef CONFIG_IWLEGACY_DEBUG
    struct il_rx_pkt *pkt = rxb_addr(rxb);
    struct il_sleep_notification *sleep = &(pkt->u.sleep_notif);
    D_RX("sleep mode: %d, src: %d\n",
         sleep->pm_sleep_mode, sleep->pm_wakeup_src);
#endif
}
EXPORT_SYMBOL(il_hdl_pm_sleep);

void
il_hdl_pm_debug_stats(struct il_priv *il, struct il_rx_buf *rxb)
{
    struct il_rx_pkt *pkt = rxb_addr(rxb);
    u32 len = le32_to_cpu(pkt->len_n_flags) & IL_RX_FRAME_SIZE_MSK;
    D_RADIO("Dumping %d bytes of unhandled notification for %s:\n", len,
        il_get_cmd_string(pkt->hdr.cmd));
    il_print_hex_dump(il, IL_DL_RADIO, pkt->u.raw, len);
}
EXPORT_SYMBOL(il_hdl_pm_debug_stats);

void
il_hdl_error(struct il_priv *il, struct il_rx_buf *rxb)
{
    struct il_rx_pkt *pkt = rxb_addr(rxb);

    IL_ERR("Error Reply type 0x%08X cmd %s (0x%02X) "
           "seq 0x%04X ser 0x%08X\n",
           le32_to_cpu(pkt->u.err_resp.error_type),
           il_get_cmd_string(pkt->u.err_resp.cmd_id),
           pkt->u.err_resp.cmd_id,
           le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
           le32_to_cpu(pkt->u.err_resp.error_info));
}
EXPORT_SYMBOL(il_hdl_error);

void
il_clear_isr_stats(struct il_priv *il)
{
    memset(&il->isr_stats, 0, sizeof(il->isr_stats));
}

int
il_mac_conf_tx(struct ieee80211_hw *hw, struct ieee80211_vif *vif, u16 queue,
           const struct ieee80211_tx_queue_params *params)
{
    struct il_priv *il = hw->priv;
    unsigned long flags;
    int q;

    D_MAC80211("enter\n");

    if (!il_is_ready_rf(il)) {
        D_MAC80211("leave - RF not ready\n");
        return -EIO;
    }

    if (queue >= AC_NUM) {
        D_MAC80211("leave - queue >= AC_NUM %d\n", queue);
        return 0;
    }

    q = AC_NUM - 1 - queue;

    spin_lock_irqsave(&il->lock, flags);

    il->qos_data.def_qos_parm.ac[q].cw_min =
        cpu_to_le16(params->cw_min);
    il->qos_data.def_qos_parm.ac[q].cw_max =
        cpu_to_le16(params->cw_max);
    il->qos_data.def_qos_parm.ac[q].aifsn = params->aifs;
    il->qos_data.def_qos_parm.ac[q].edca_txop =
        cpu_to_le16((params->txop * 32));

    il->qos_data.def_qos_parm.ac[q].reserved1 = 0;

    spin_unlock_irqrestore(&il->lock, flags);

    D_MAC80211("leave\n");
    return 0;
}
EXPORT_SYMBOL(il_mac_conf_tx);

int
il_mac_tx_last_beacon(struct ieee80211_hw *hw)
{
    struct il_priv *il = hw->priv;
    int ret;

    D_MAC80211("enter\n");

    ret = (il->ibss_manager == IL_IBSS_MANAGER);

    D_MAC80211("leave ret %d\n", ret);
    return ret;
}
EXPORT_SYMBOL_GPL(il_mac_tx_last_beacon);

static int
il_set_mode(struct il_priv *il)
{
    il_connection_init_rx_config(il);

    if (il->ops->set_rxon_chain)
        il->ops->set_rxon_chain(il);

    return il_commit_rxon(il);
}

int
il_mac_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
    struct il_priv *il = hw->priv;
    int err;
    bool reset;

    mutex_lock(&il->mutex);
    D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);

    if (!il_is_ready_rf(il)) {
        IL_WARN("Try to add interface when device not ready\n");
        err = -EINVAL;
        goto out;
    }

    /*
     * We do not support multiple virtual interfaces, but on hardware reset
     * we have to add the same interface again.
     */
    reset = (il->vif == vif);
    if (il->vif && !reset) {
        err = -EOPNOTSUPP;
        goto out;
    }

    il->vif = vif;
    il->iw_mode = vif->type;

    err = il_set_mode(il);
    if (err) {
        IL_WARN("Fail to set mode %d\n", vif->type);
        if (!reset) {
            il->vif = NULL;
            il->iw_mode = NL80211_IFTYPE_STATION;
        }
    }

out:
    D_MAC80211("leave err %d\n", err);
    mutex_unlock(&il->mutex);

    return err;
}
EXPORT_SYMBOL(il_mac_add_interface);

static void
il_teardown_interface(struct il_priv *il, struct ieee80211_vif *vif,
              bool mode_change)
{
    lockdep_assert_held(&il->mutex);

    if (il->scan_vif == vif) {
        il_scan_cancel_timeout(il, 200);
        il_force_scan_end(il);
    }

    if (!mode_change)
        il_set_mode(il);

}

void
il_mac_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
    struct il_priv *il = hw->priv;

    mutex_lock(&il->mutex);
    D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);

    WARN_ON(il->vif != vif);
    il->vif = NULL;

    il_teardown_interface(il, vif, false);
    memset(il->bssid, 0, ETH_ALEN);

    D_MAC80211("leave\n");
    mutex_unlock(&il->mutex);
}
EXPORT_SYMBOL(il_mac_remove_interface);

int
il_alloc_txq_mem(struct il_priv *il)
{
    if (!il->txq)
        il->txq =
            kzalloc(sizeof(struct il_tx_queue) *
                il->cfg->num_of_queues, GFP_KERNEL);
    if (!il->txq) {
        IL_ERR("Not enough memory for txq\n");
        return -ENOMEM;
    }
    return 0;
}
EXPORT_SYMBOL(il_alloc_txq_mem);

void
il_free_txq_mem(struct il_priv *il)
{
    kfree(il->txq);
    il->txq = NULL;
}
EXPORT_SYMBOL(il_free_txq_mem);

int
il_force_reset(struct il_priv *il, bool external)
{
    struct il_force_reset *force_reset;

    if (test_bit(S_EXIT_PENDING, &il->status))
        return -EINVAL;

    force_reset = &il->force_reset;
    force_reset->reset_request_count++;
    if (!external) {
        if (force_reset->last_force_reset_jiffies &&
            time_after(force_reset->last_force_reset_jiffies +
                   force_reset->reset_duration, jiffies)) {
            D_INFO("force reset rejected\n");
            force_reset->reset_reject_count++;
            return -EAGAIN;
        }
    }
    force_reset->reset_success_count++;
    force_reset->last_force_reset_jiffies = jiffies;

    /*
     * if the request is from external(ex: debugfs),
     * then always perform the request in regardless the module
     * parameter setting
     * if the request is from internal (uCode error or driver
     * detect failure), then fw_restart module parameter
     * need to be check before performing firmware reload
     */

    if (!external && !il->cfg->mod_params->restart_fw) {
        D_INFO("Cancel firmware reload based on "
               "module parameter setting\n");
        return 0;
    }

    IL_ERR("On demand firmware reload\n");

    /* Set the FW error flag -- cleared on il_down */
    set_bit(S_FW_ERROR, &il->status);
    wake_up(&il->wait_command_queue);
    /*
     * Keep the restart process from trying to send host
     * commands by clearing the INIT status bit
     */
    clear_bit(S_READY, &il->status);
    queue_work(il->workqueue, &il->restart);

    return 0;
}

int
il_mac_change_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
            enum nl80211_iftype newtype, bool newp2p)
{
    struct il_priv *il = hw->priv;
    int err;

    mutex_lock(&il->mutex);
    D_MAC80211("enter: type %d, addr %pM newtype %d newp2p %d\n",
            vif->type, vif->addr, newtype, newp2p);

    if (newp2p) {
        err = -EOPNOTSUPP;
        goto out;
    }

    if (!il->vif || !il_is_ready_rf(il)) {
        /*
         * Huh? But wait ... this can maybe happen when
         * we're in the middle of a firmware restart!
         */
        err = -EBUSY;
        goto out;
    }

    /* success */
    il_teardown_interface(il, vif, true);
    vif->type = newtype;
    vif->p2p = false;
    err = il_set_mode(il);
    WARN_ON(err);
    /*
     * We've switched internally, but submitting to the
     * device may have failed for some reason. Mask this
     * error, because otherwise mac80211 will not switch
     * (and set the interface type back) and we'll be
     * out of sync with it.
     */
    err = 0;

out:
    D_MAC80211("leave err %d\n", err);
    mutex_unlock(&il->mutex);

    return err;
}
EXPORT_SYMBOL(il_mac_change_interface);

/*
 * On every watchdog tick we check (latest) time stamp. If it does not
 * change during timeout period and queue is not empty we reset firmware.
 */
static int
il_check_stuck_queue(struct il_priv *il, int cnt)
{
    struct il_tx_queue *txq = &il->txq[cnt];
    struct il_queue *q = &txq->q;
    unsigned long timeout;
    unsigned long now = jiffies;
    int ret;

    if (q->read_ptr == q->write_ptr) {
        txq->time_stamp = now;
        return 0;
    }

    timeout =
        txq->time_stamp +
        msecs_to_jiffies(il->cfg->wd_timeout);

    if (time_after(now, timeout)) {
        IL_ERR("Queue %d stuck for %u ms.\n", q->id,
               jiffies_to_msecs(now - txq->time_stamp));
        ret = il_force_reset(il, false);
        return (ret == -EAGAIN) ? 0 : 1;
    }

    return 0;
}

/*
 * Making watchdog tick be a quarter of timeout assure we will
 * discover the queue hung between timeout and 1.25*timeout
 */
#define IL_WD_TICK(timeout) ((timeout) / 4)

/*
 * Watchdog timer callback, we check each tx queue for stuck, if if hung
 * we reset the firmware. If everything is fine just rearm the timer.
 */
void
il_bg_watchdog(unsigned long data)
{
    struct il_priv *il = (struct il_priv *)data;
    int cnt;
    unsigned long timeout;

    if (test_bit(S_EXIT_PENDING, &il->status))
        return;

    timeout = il->cfg->wd_timeout;
    if (timeout == 0)
        return;

    /* monitor and check for stuck cmd queue */
    if (il_check_stuck_queue(il, il->cmd_queue))
        return;

    /* monitor and check for other stuck queues */
    for (cnt = 0; cnt < il->hw_params.max_txq_num; cnt++) {
        /* skip as we already checked the command queue */
        if (cnt == il->cmd_queue)
            continue;
        if (il_check_stuck_queue(il, cnt))
            return;
    }

    mod_timer(&il->watchdog,
          jiffies + msecs_to_jiffies(IL_WD_TICK(timeout)));
}
EXPORT_SYMBOL(il_bg_watchdog);

void
il_setup_watchdog(struct il_priv *il)
{
    unsigned int timeout = il->cfg->wd_timeout;

    if (timeout)
        mod_timer(&il->watchdog,
              jiffies + msecs_to_jiffies(IL_WD_TICK(timeout)));
    else
        del_timer(&il->watchdog);
}
EXPORT_SYMBOL(il_setup_watchdog);

/*
 * extended beacon time format
 * time in usec will be changed into a 32-bit value in extended:internal format
 * the extended part is the beacon counts
 * the internal part is the time in usec within one beacon interval
 */
u32
il_usecs_to_beacons(struct il_priv *il, u32 usec, u32 beacon_interval)
{
    u32 quot;
    u32 rem;
    u32 interval = beacon_interval * TIME_UNIT;

    if (!interval || !usec)
        return 0;

    quot =
        (usec /
         interval) & (il_beacon_time_mask_high(il,
                           il->hw_params.
                           beacon_time_tsf_bits) >> il->
              hw_params.beacon_time_tsf_bits);
    rem =
        (usec % interval) & il_beacon_time_mask_low(il,
                            il->hw_params.
                            beacon_time_tsf_bits);

    return (quot << il->hw_params.beacon_time_tsf_bits) + rem;
}
EXPORT_SYMBOL(il_usecs_to_beacons);

/* base is usually what we get from ucode with each received frame,
 * the same as HW timer counter counting down
 */
__le32
il_add_beacon_time(struct il_priv *il, u32 base, u32 addon,
           u32 beacon_interval)
{
    u32 base_low = base & il_beacon_time_mask_low(il,
                              il->hw_params.
                              beacon_time_tsf_bits);
    u32 addon_low = addon & il_beacon_time_mask_low(il,
                            il->hw_params.
                            beacon_time_tsf_bits);
    u32 interval = beacon_interval * TIME_UNIT;
    u32 res = (base & il_beacon_time_mask_high(il,
                           il->hw_params.
                           beacon_time_tsf_bits)) +
        (addon & il_beacon_time_mask_high(il,
                          il->hw_params.
                          beacon_time_tsf_bits));

    if (base_low > addon_low)
        res += base_low - addon_low;
    else if (base_low < addon_low) {
        res += interval + base_low - addon_low;
        res += (1 << il->hw_params.beacon_time_tsf_bits);
    } else
        res += (1 << il->hw_params.beacon_time_tsf_bits);

    return cpu_to_le32(res);
}
EXPORT_SYMBOL(il_add_beacon_time);

#ifdef CONFIG_PM

static int
il_pci_suspend(struct device *device)
{
    struct pci_dev *pdev = to_pci_dev(device);
    struct il_priv *il = pci_get_drvdata(pdev);

    /*
     * This function is called when system goes into suspend state
     * mac80211 will call il_mac_stop() from the mac80211 suspend function
     * first but since il_mac_stop() has no knowledge of who the caller is,
     * it will not call apm_ops.stop() to stop the DMA operation.
     * Calling apm_ops.stop here to make sure we stop the DMA.
     */
    il_apm_stop(il);

    return 0;
}

static int
il_pci_resume(struct device *device)
{
    struct pci_dev *pdev = to_pci_dev(device);
    struct il_priv *il = pci_get_drvdata(pdev);
    bool hw_rfkill = false;

    /*
     * We disable the RETRY_TIMEOUT register (0x41) to keep
     * PCI Tx retries from interfering with C3 CPU state.
     */
    pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);

    il_enable_interrupts(il);

    if (!(_il_rd(il, CSR_GP_CNTRL) & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
        hw_rfkill = true;

    if (hw_rfkill)
        set_bit(S_RFKILL, &il->status);
    else
        clear_bit(S_RFKILL, &il->status);

    wiphy_rfkill_set_hw_state(il->hw->wiphy, hw_rfkill);

    return 0;
}

SIMPLE_DEV_PM_OPS(il_pm_ops, il_pci_suspend, il_pci_resume);
EXPORT_SYMBOL(il_pm_ops);

#endif /* CONFIG_PM */

static void
il_update_qos(struct il_priv *il)
{
    if (test_bit(S_EXIT_PENDING, &il->status))
        return;

    il->qos_data.def_qos_parm.qos_flags = 0;

    if (il->qos_data.qos_active)
        il->qos_data.def_qos_parm.qos_flags |=
            QOS_PARAM_FLG_UPDATE_EDCA_MSK;

    if (il->ht.enabled)
        il->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;

    D_QOS("send QoS cmd with Qos active=%d FLAGS=0x%X\n",
          il->qos_data.qos_active, il->qos_data.def_qos_parm.qos_flags);

    il_send_cmd_pdu_async(il, C_QOS_PARAM, sizeof(struct il_qosparam_cmd),
                  &il->qos_data.def_qos_parm, NULL);
}

int
il_mac_config(struct ieee80211_hw *hw, u32 changed)
{
    struct il_priv *il = hw->priv;
    const struct il_channel_info *ch_info;
    struct ieee80211_conf *conf = &hw->conf;
    struct ieee80211_channel *channel = conf->channel;
    struct il_ht_config *ht_conf = &il->current_ht_config;
    unsigned long flags = 0;
    int ret = 0;
    u16 ch;
    int scan_active = 0;
    bool ht_changed = false;

    mutex_lock(&il->mutex);
    D_MAC80211("enter: channel %d changed 0x%X\n", channel->hw_value,
           changed);

    if (unlikely(test_bit(S_SCANNING, &il->status))) {
        scan_active = 1;
        D_MAC80211("scan active\n");
    }

    if (changed &
        (IEEE80211_CONF_CHANGE_SMPS | IEEE80211_CONF_CHANGE_CHANNEL)) {
        /* mac80211 uses static for non-HT which is what we want */
        il->current_ht_config.smps = conf->smps_mode;

        /*
         * Recalculate chain counts.
         *
         * If monitor mode is enabled then mac80211 will
         * set up the SM PS mode to OFF if an HT channel is
         * configured.
         */
        if (il->ops->set_rxon_chain)
            il->ops->set_rxon_chain(il);
    }

    /* during scanning mac80211 will delay channel setting until
     * scan finish with changed = 0
     */
    if (!changed || (changed & IEEE80211_CONF_CHANGE_CHANNEL)) {

        if (scan_active)
            goto set_ch_out;

        ch = channel->hw_value;
        ch_info = il_get_channel_info(il, channel->band, ch);
        if (!il_is_channel_valid(ch_info)) {
            D_MAC80211("leave - invalid channel\n");
            ret = -EINVAL;
            goto set_ch_out;
        }

        if (il->iw_mode == NL80211_IFTYPE_ADHOC &&
            !il_is_channel_ibss(ch_info)) {
            D_MAC80211("leave - not IBSS channel\n");
            ret = -EINVAL;
            goto set_ch_out;
        }

        spin_lock_irqsave(&il->lock, flags);

        /* Configure HT40 channels */
        if (il->ht.enabled != conf_is_ht(conf)) {
            il->ht.enabled = conf_is_ht(conf);
            ht_changed = true;
        }
        if (il->ht.enabled) {
            if (conf_is_ht40_minus(conf)) {
                il->ht.extension_chan_offset =
                    IEEE80211_HT_PARAM_CHA_SEC_BELOW;
                il->ht.is_40mhz = true;
            } else if (conf_is_ht40_plus(conf)) {
                il->ht.extension_chan_offset =
                    IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
                il->ht.is_40mhz = true;
            } else {
                il->ht.extension_chan_offset =
                    IEEE80211_HT_PARAM_CHA_SEC_NONE;
                il->ht.is_40mhz = false;
            }
        } else
            il->ht.is_40mhz = false;

        /*
         * Default to no protection. Protection mode will
         * later be set from BSS config in il_ht_conf
         */
        il->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;

        /* if we are switching from ht to 2.4 clear flags
         * from any ht related info since 2.4 does not
         * support ht */
        if ((le16_to_cpu(il->staging.channel) != ch))
            il->staging.flags = 0;

        il_set_rxon_channel(il, channel);
        il_set_rxon_ht(il, ht_conf);

        il_set_flags_for_band(il, channel->band, il->vif);

        spin_unlock_irqrestore(&il->lock, flags);

        if (il->ops->update_bcast_stations)
            ret = il->ops->update_bcast_stations(il);

set_ch_out:
        /* The list of supported rates and rate mask can be different
         * for each band; since the band may have changed, reset
         * the rate mask to what mac80211 lists */
        il_set_rate(il);
    }

    if (changed & (IEEE80211_CONF_CHANGE_PS | IEEE80211_CONF_CHANGE_IDLE)) {
        ret = il_power_update_mode(il, false);
        if (ret)
            D_MAC80211("Error setting sleep level\n");
    }

    if (changed & IEEE80211_CONF_CHANGE_POWER) {
        D_MAC80211("TX Power old=%d new=%d\n", il->tx_power_user_lmt,
               conf->power_level);

        il_set_tx_power(il, conf->power_level, false);
    }

    if (!il_is_ready(il)) {
        D_MAC80211("leave - not ready\n");
        goto out;
    }

    if (scan_active)
        goto out;

    if (memcmp(&il->active, &il->staging, sizeof(il->staging)))
        il_commit_rxon(il);
    else
        D_INFO("Not re-sending same RXON configuration.\n");
    if (ht_changed)
        il_update_qos(il);

out:
    D_MAC80211("leave ret %d\n", ret);
    mutex_unlock(&il->mutex);

    return ret;
}
EXPORT_SYMBOL(il_mac_config);

void
il_mac_reset_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
    struct il_priv *il = hw->priv;
    unsigned long flags;

    mutex_lock(&il->mutex);
    D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);

    spin_lock_irqsave(&il->lock, flags);

    memset(&il->current_ht_config, 0, sizeof(struct il_ht_config));

    /* new association get rid of ibss beacon skb */
    if (il->beacon_skb)
        dev_kfree_skb(il->beacon_skb);
    il->beacon_skb = NULL;
    il->timestamp = 0;

    spin_unlock_irqrestore(&il->lock, flags);

    il_scan_cancel_timeout(il, 100);
    if (!il_is_ready_rf(il)) {
        D_MAC80211("leave - not ready\n");
        mutex_unlock(&il->mutex);
        return;
    }

    /* we are restarting association process */
    il->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
    il_commit_rxon(il);

    il_set_rate(il);

    D_MAC80211("leave\n");
    mutex_unlock(&il->mutex);
}
EXPORT_SYMBOL(il_mac_reset_tsf);

static void
il_ht_conf(struct il_priv *il, struct ieee80211_vif *vif)
{
    struct il_ht_config *ht_conf = &il->current_ht_config;
    struct ieee80211_sta *sta;
    struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;

    D_ASSOC("enter:\n");

    if (!il->ht.enabled)
        return;

    il->ht.protection =
        bss_conf->ht_operation_mode & IEEE80211_HT_OP_MODE_PROTECTION;
    il->ht.non_gf_sta_present =
        !!(bss_conf->
           ht_operation_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);

    ht_conf->single_chain_sufficient = false;

    switch (vif->type) {
    case NL80211_IFTYPE_STATION:
        rcu_read_lock();
        sta = ieee80211_find_sta(vif, bss_conf->bssid);
        if (sta) {
            struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
            int maxstreams;

            maxstreams =
                (ht_cap->mcs.
                 tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
                >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
            maxstreams += 1;

            if (ht_cap->mcs.rx_mask[1] == 0 &&
                ht_cap->mcs.rx_mask[2] == 0)
                ht_conf->single_chain_sufficient = true;
            if (maxstreams <= 1)
                ht_conf->single_chain_sufficient = true;
        } else {
            /*
             * If at all, this can only happen through a race
             * when the AP disconnects us while we're still
             * setting up the connection, in that case mac80211
             * will soon tell us about that.
             */
            ht_conf->single_chain_sufficient = true;
        }
        rcu_read_unlock();
        break;
    case NL80211_IFTYPE_ADHOC:
        ht_conf->single_chain_sufficient = true;
        break;
    default:
        break;
    }

    D_ASSOC("leave\n");
}

static inline void
il_set_no_assoc(struct il_priv *il, struct ieee80211_vif *vif)
{
    /*
     * inform the ucode that there is no longer an
     * association and that no more packets should be
     * sent
     */
    il->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
    il->staging.assoc_id = 0;
    il_commit_rxon(il);
}

static void
il_beacon_update(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
    struct il_priv *il = hw->priv;
    unsigned long flags;
    __le64 timestamp;
    struct sk_buff *skb = ieee80211_beacon_get(hw, vif);

    if (!skb)
        return;

    D_MAC80211("enter\n");

    lockdep_assert_held(&il->mutex);

    if (!il->beacon_enabled) {
        IL_ERR("update beacon with no beaconing enabled\n");
        dev_kfree_skb(skb);
        return;
    }

    spin_lock_irqsave(&il->lock, flags);

    if (il->beacon_skb)
        dev_kfree_skb(il->beacon_skb);

    il->beacon_skb = skb;

    timestamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
    il->timestamp = le64_to_cpu(timestamp);

    D_MAC80211("leave\n");
    spin_unlock_irqrestore(&il->lock, flags);

    if (!il_is_ready_rf(il)) {
        D_MAC80211("leave - RF not ready\n");
        return;
    }

    il->ops->post_associate(il);
}

void
il_mac_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
            struct ieee80211_bss_conf *bss_conf, u32 changes)
{
    struct il_priv *il = hw->priv;
    int ret;

    mutex_lock(&il->mutex);
    D_MAC80211("enter: changes 0x%x\n", changes);

    if (!il_is_alive(il)) {
        D_MAC80211("leave - not alive\n");
        mutex_unlock(&il->mutex);
        return;
    }

    if (changes & BSS_CHANGED_QOS) {
        unsigned long flags;

        spin_lock_irqsave(&il->lock, flags);
        il->qos_data.qos_active = bss_conf->qos;
        il_update_qos(il);
        spin_unlock_irqrestore(&il->lock, flags);
    }

    if (changes & BSS_CHANGED_BEACON_ENABLED) {
        /* FIXME: can we remove beacon_enabled ? */
        if (vif->bss_conf.enable_beacon)
            il->beacon_enabled = true;
        else
            il->beacon_enabled = false;
    }

    if (changes & BSS_CHANGED_BSSID) {
        D_MAC80211("BSSID %pM\n", bss_conf->bssid);

        /*
         * If there is currently a HW scan going on in the background,
         * then we need to cancel it, otherwise sometimes we are not
         * able to authenticate (FIXME: why ?)
         */
        if (il_scan_cancel_timeout(il, 100)) {
            D_MAC80211("leave - scan abort failed\n");
            mutex_unlock(&il->mutex);
            return;
        }

        /* mac80211 only sets assoc when in STATION mode */
        memcpy(il->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);

        /* FIXME: currently needed in a few places */
        memcpy(il->bssid, bss_conf->bssid, ETH_ALEN);
    }

    /*
     * This needs to be after setting the BSSID in case
     * mac80211 decides to do both changes at once because
     * it will invoke post_associate.
     */
    if (vif->type == NL80211_IFTYPE_ADHOC && (changes & BSS_CHANGED_BEACON))
        il_beacon_update(hw, vif);

    if (changes & BSS_CHANGED_ERP_PREAMBLE) {
        D_MAC80211("ERP_PREAMBLE %d\n", bss_conf->use_short_preamble);
        if (bss_conf->use_short_preamble)
            il->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
        else
            il->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
    }

    if (changes & BSS_CHANGED_ERP_CTS_PROT) {
        D_MAC80211("ERP_CTS %d\n", bss_conf->use_cts_prot);
        if (bss_conf->use_cts_prot && il->band != IEEE80211_BAND_5GHZ)
            il->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
        else
            il->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
        if (bss_conf->use_cts_prot)
            il->staging.flags |= RXON_FLG_SELF_CTS_EN;
        else
            il->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
    }

    if (changes & BSS_CHANGED_BASIC_RATES) {
        /* XXX use this information
         *
         * To do that, remove code from il_set_rate() and put something
         * like this here:
         *
         if (A-band)
         il->staging.ofdm_basic_rates =
         bss_conf->basic_rates;
         else
         il->staging.ofdm_basic_rates =
         bss_conf->basic_rates >> 4;
         il->staging.cck_basic_rates =
         bss_conf->basic_rates & 0xF;
         */
    }

    if (changes & BSS_CHANGED_HT) {
        il_ht_conf(il, vif);

        if (il->ops->set_rxon_chain)
            il->ops->set_rxon_chain(il);
    }

    if (changes & BSS_CHANGED_ASSOC) {
        D_MAC80211("ASSOC %d\n", bss_conf->assoc);
        if (bss_conf->assoc) {
            il->timestamp = bss_conf->sync_tsf;

            if (!il_is_rfkill(il))
                il->ops->post_associate(il);
        } else
            il_set_no_assoc(il, vif);
    }

    if (changes && il_is_associated(il) && bss_conf->aid) {
        D_MAC80211("Changes (%#x) while associated\n", changes);
        ret = il_send_rxon_assoc(il);
        if (!ret) {
            /* Sync active_rxon with latest change. */
            memcpy((void *)&il->active, &il->staging,
                   sizeof(struct il_rxon_cmd));
        }
    }

    if (changes & BSS_CHANGED_BEACON_ENABLED) {
        if (vif->bss_conf.enable_beacon) {
            memcpy(il->staging.bssid_addr, bss_conf->bssid,
                   ETH_ALEN);
            memcpy(il->bssid, bss_conf->bssid, ETH_ALEN);
            il->ops->config_ap(il);
        } else
            il_set_no_assoc(il, vif);
    }

    if (changes & BSS_CHANGED_IBSS) {
        ret = il->ops->manage_ibss_station(il, vif,
                           bss_conf->ibss_joined);
        if (ret)
            IL_ERR("failed to %s IBSS station %pM\n",
                   bss_conf->ibss_joined ? "add" : "remove",
                   bss_conf->bssid);
    }

    D_MAC80211("leave\n");
    mutex_unlock(&il->mutex);
}
EXPORT_SYMBOL(il_mac_bss_info_changed);

irqreturn_t
il_isr(int irq, void *data)
{
    struct il_priv *il = data;
    u32 inta, inta_mask;
    u32 inta_fh;
    unsigned long flags;
    if (!il)
        return IRQ_NONE;

    spin_lock_irqsave(&il->lock, flags);

    /* Disable (but don't clear!) interrupts here to avoid
     *    back-to-back ISRs and sporadic interrupts from our NIC.
     * If we have something to service, the tasklet will re-enable ints.
     * If we *don't* have something, we'll re-enable before leaving here. */
    inta_mask = _il_rd(il, CSR_INT_MASK);   /* just for debug */
    _il_wr(il, CSR_INT_MASK, 0x00000000);

    /* Discover which interrupts are active/pending */
    inta = _il_rd(il, CSR_INT);
    inta_fh = _il_rd(il, CSR_FH_INT_STATUS);

    /* Ignore interrupt if there's nothing in NIC to service.
     * This may be due to IRQ shared with another device,
     * or due to sporadic interrupts thrown from our NIC. */
    if (!inta && !inta_fh) {
        D_ISR("Ignore interrupt, inta == 0, inta_fh == 0\n");
        goto none;
    }

    if (inta == 0xFFFFFFFF || (inta & 0xFFFFFFF0) == 0xa5a5a5a0) {
        /* Hardware disappeared. It might have already raised
         * an interrupt */
        IL_WARN("HARDWARE GONE?? INTA == 0x%08x\n", inta);
        goto unplugged;
    }

    D_ISR("ISR inta 0x%08x, enabled 0x%08x, fh 0x%08x\n", inta, inta_mask,
          inta_fh);

    inta &= ~CSR_INT_BIT_SCD;

    /* il_irq_tasklet() will service interrupts and re-enable them */
    if (likely(inta || inta_fh))
        tasklet_schedule(&il->irq_tasklet);

unplugged:
    spin_unlock_irqrestore(&il->lock, flags);
    return IRQ_HANDLED;

none:
    /* re-enable interrupts here since we don't have anything to service. */
    /* only Re-enable if disabled by irq */
    if (test_bit(S_INT_ENABLED, &il->status))
        il_enable_interrupts(il);
    spin_unlock_irqrestore(&il->lock, flags);
    return IRQ_NONE;
}
EXPORT_SYMBOL(il_isr);

/*
 *  il_tx_cmd_protection: Set rts/cts. 3945 and 4965 only share this
 *  function.
 */
void
il_tx_cmd_protection(struct il_priv *il, struct ieee80211_tx_info *info,
             __le16 fc, __le32 *tx_flags)
{
    if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) {
        *tx_flags |= TX_CMD_FLG_RTS_MSK;
        *tx_flags &= ~TX_CMD_FLG_CTS_MSK;
        *tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;

        if (!ieee80211_is_mgmt(fc))
            return;

        switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
        case cpu_to_le16(IEEE80211_STYPE_AUTH):
        case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
        case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
        case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
            *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
            *tx_flags |= TX_CMD_FLG_CTS_MSK;
            break;
        }
    } else if (info->control.rates[0].
           flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
        *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
        *tx_flags |= TX_CMD_FLG_CTS_MSK;
        *tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
    }
}
EXPORT_SYMBOL(il_tx_cmd_protection);