Fix common misspellings

[thirdparty/kernel/linux.git] / drivers / net / wireless / iwlwifi / iwl-core.c

/******************************************************************************
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2010 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 <ilw@linux.intel.com>
 * 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 <net/mac80211.h>

#include "iwl-eeprom.h"
#include "iwl-dev.h" /* FIXME: remove */
#include "iwl-debug.h"
#include "iwl-core.h"
#include "iwl-io.h"
#include "iwl-power.h"
#include "iwl-sta.h"
#include "iwl-helpers.h"


/*
 * 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)
 */
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 iwl_debug_level;

const u8 iwl_bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };


/* This function both allocates and initializes hw and priv. */
struct ieee80211_hw *iwl_alloc_all(struct iwl_cfg *cfg)
{
        struct iwl_priv *priv;
        /* mac80211 allocates memory for this device instance, including
         *   space for this driver's private structure */
        struct ieee80211_hw *hw;

        hw = ieee80211_alloc_hw(sizeof(struct iwl_priv),
                                cfg->ops->ieee80211_ops);
        if (hw == NULL) {
                pr_err("%s: Can not allocate network device\n",
                       cfg->name);
                goto out;
        }

        priv = hw->priv;
        priv->hw = hw;

out:
        return hw;
}

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

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

        ht_info->ht_supported = true;

        if (priv->cfg->ht_params &&
            priv->cfg->ht_params->ht_greenfield_support)
                ht_info->cap |= IEEE80211_HT_CAP_GRN_FLD;
        ht_info->cap |= IEEE80211_HT_CAP_SGI_20;
        max_bit_rate = MAX_BIT_RATE_20_MHZ;
        if (priv->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 (priv->cfg->mod_params->amsdu_size_8K)
                ht_info->cap |= IEEE80211_HT_CAP_MAX_AMSDU;

        ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
        if (priv->cfg->bt_params && priv->cfg->bt_params->ampdu_factor)
                ht_info->ampdu_factor = priv->cfg->bt_params->ampdu_factor;
        ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;
        if (priv->cfg->bt_params && priv->cfg->bt_params->ampdu_density)
                ht_info->ampdu_density = priv->cfg->bt_params->ampdu_density;

        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);
        }
}

/**
 * iwlcore_init_geos - Initialize mac80211's geo/channel info based from eeprom
 */
int iwlcore_init_geos(struct iwl_priv *priv)
{
        struct iwl_channel_info *ch;
        struct ieee80211_supported_band *sband;
        struct ieee80211_channel *channels;
        struct ieee80211_channel *geo_ch;
        struct ieee80211_rate *rates;
        int i = 0;

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

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

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

        /* 5.2GHz channels start after the 2.4GHz channels */
        sband = &priv->bands[IEEE80211_BAND_5GHZ];
        sband->channels = &channels[ARRAY_SIZE(iwl_eeprom_band_1)];
        /* just OFDM */
        sband->bitrates = &rates[IWL_FIRST_OFDM_RATE];
        sband->n_bitrates = IWL_RATE_COUNT_LEGACY - IWL_FIRST_OFDM_RATE;

        if (priv->cfg->sku & IWL_SKU_N)
                iwlcore_init_ht_hw_capab(priv, &sband->ht_cap,
                                         IEEE80211_BAND_5GHZ);

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

        if (priv->cfg->sku & IWL_SKU_N)
                iwlcore_init_ht_hw_capab(priv, &sband->ht_cap,
                                         IEEE80211_BAND_2GHZ);

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

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

                /* FIXME: might be removed if scan is OK */
                if (!is_channel_valid(ch))
                        continue;

                sband =  &priv->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 (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 > priv->tx_power_device_lmt)
                                priv->tx_power_device_lmt = ch->max_power_avg;
                } else {
                        geo_ch->flags |= IEEE80211_CHAN_DISABLED;
                }

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

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

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

        set_bit(STATUS_GEO_CONFIGURED, &priv->status);

        return 0;
}

/*
 * iwlcore_free_geos - undo allocations in iwlcore_init_geos
 */
void iwlcore_free_geos(struct iwl_priv *priv)
{
        kfree(priv->ieee_channels);
        kfree(priv->ieee_rates);
        clear_bit(STATUS_GEO_CONFIGURED, &priv->status);
}

static bool iwl_is_channel_extension(struct iwl_priv *priv,
                                     enum ieee80211_band band,
                                     u16 channel, u8 extension_chan_offset)
{
        const struct iwl_channel_info *ch_info;

        ch_info = iwl_get_channel_info(priv, band, channel);
        if (!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 iwl_is_ht40_tx_allowed(struct iwl_priv *priv,
                            struct iwl_rxon_context *ctx,
                            struct ieee80211_sta_ht_cap *ht_cap)
{
        if (!ctx->ht.enabled || !ctx->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_IWLWIFI_DEBUGFS
        if (priv->disable_ht40)
                return false;
#endif

        return iwl_is_channel_extension(priv, priv->band,
                        le16_to_cpu(ctx->staging.channel),
                        ctx->ht.extension_chan_offset);
}

static u16 iwl_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 (not checking this here
         * would cause the adjustment below to return the maximum
         * value, which may break PAN.)
         */
        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 iwl_send_rxon_timing(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
{
        u64 tsf;
        s32 interval_tm, rem;
        struct ieee80211_conf *conf = NULL;
        u16 beacon_int;
        struct ieee80211_vif *vif = ctx->vif;

        conf = ieee80211_get_hw_conf(priv->hw);

        lockdep_assert_held(&priv->mutex);

        memset(&ctx->timing, 0, sizeof(struct iwl_rxon_time_cmd));

        ctx->timing.timestamp = cpu_to_le64(priv->timestamp);
        ctx->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_window from mac80211,
         *       for now just always use 0
         */
        ctx->timing.atim_window = 0;

        if (ctx->ctxid == IWL_RXON_CTX_PAN &&
            (!ctx->vif || ctx->vif->type != NL80211_IFTYPE_STATION) &&
            iwl_is_associated(priv, IWL_RXON_CTX_BSS) &&
            priv->contexts[IWL_RXON_CTX_BSS].vif &&
            priv->contexts[IWL_RXON_CTX_BSS].vif->bss_conf.beacon_int) {
                ctx->timing.beacon_interval =
                        priv->contexts[IWL_RXON_CTX_BSS].timing.beacon_interval;
                beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
        } else if (ctx->ctxid == IWL_RXON_CTX_BSS &&
                   iwl_is_associated(priv, IWL_RXON_CTX_PAN) &&
                   priv->contexts[IWL_RXON_CTX_PAN].vif &&
                   priv->contexts[IWL_RXON_CTX_PAN].vif->bss_conf.beacon_int &&
                   (!iwl_is_associated_ctx(ctx) || !ctx->vif ||
                    !ctx->vif->bss_conf.beacon_int)) {
                ctx->timing.beacon_interval =
                        priv->contexts[IWL_RXON_CTX_PAN].timing.beacon_interval;
                beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
        } else {
                beacon_int = iwl_adjust_beacon_interval(beacon_int,
                                priv->hw_params.max_beacon_itrvl * TIME_UNIT);
                ctx->timing.beacon_interval = cpu_to_le16(beacon_int);
        }

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

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

        IWL_DEBUG_ASSOC(priv,
                        "beacon interval %d beacon timer %d beacon tim %d\n",
                        le16_to_cpu(ctx->timing.beacon_interval),
                        le32_to_cpu(ctx->timing.beacon_init_val),
                        le16_to_cpu(ctx->timing.atim_window));

        return iwl_send_cmd_pdu(priv, ctx->rxon_timing_cmd,
                                sizeof(ctx->timing), &ctx->timing);
}

void iwl_set_rxon_hwcrypto(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
                           int hw_decrypt)
{
        struct iwl_rxon_cmd *rxon = &ctx->staging;

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

}

/* validate RXON structure is valid */
int iwl_check_rxon_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
{
        struct iwl_rxon_cmd *rxon = &ctx->staging;
        bool error = false;

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

        /* make sure basic rates 6Mbps and 1Mbps are supported */
        if ((rxon->ofdm_basic_rates & IWL_RATE_6M_MASK) == 0 &&
            (rxon->cck_basic_rates & IWL_RATE_1M_MASK) == 0) {
                IWL_WARN(priv, "neither 1 nor 6 are basic\n");
                error = true;
        }

        if (le16_to_cpu(rxon->assoc_id) > 2007) {
                IWL_WARN(priv, "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)) {
                IWL_WARN(priv, "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)) {
                IWL_WARN(priv, "CCK and auto detect");
                error = true;
        }

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

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

        if (error) {
                IWL_ERR(priv, "Invalid RXON\n");
                return -EINVAL;
        }
        return 0;
}

/**
 * iwl_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
 * @priv: staging_rxon is compared to active_rxon
 *
 * If the RXON structure is changing enough to require a new tune,
 * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
 * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
 */
int iwl_full_rxon_required(struct iwl_priv *priv,
                           struct iwl_rxon_context *ctx)
{
        const struct iwl_rxon_cmd *staging = &ctx->staging;
        const struct iwl_rxon_cmd *active = &ctx->active;

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

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

        /* These items are only settable from the full RXON command */
        CHK(!iwl_is_associated_ctx(ctx));
        CHK(compare_ether_addr(staging->bssid_addr, active->bssid_addr));
        CHK(compare_ether_addr(staging->node_addr, active->node_addr));
        CHK(compare_ether_addr(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->ofdm_ht_triple_stream_basic_rates,
                active->ofdm_ht_triple_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;
}

u8 iwl_rate_get_lowest_plcp(struct iwl_priv *priv,
                            struct iwl_rxon_context *ctx)
{
        /*
         * Assign the lowest rate -- should really get this from
         * the beacon skb from mac80211.
         */
        if (ctx->staging.flags & RXON_FLG_BAND_24G_MSK)
                return IWL_RATE_1M_PLCP;
        else
                return IWL_RATE_6M_PLCP;
}

static void _iwl_set_rxon_ht(struct iwl_priv *priv,
                             struct iwl_ht_config *ht_conf,
                             struct iwl_rxon_context *ctx)
{
        struct iwl_rxon_cmd *rxon = &ctx->staging;

        if (!ctx->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;
        }

        /* FIXME: if the definition of ht.protection changed, the "translation"
         * will be needed for rxon->flags
         */
        rxon->flags |= cpu_to_le32(ctx->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 (iwl_is_ht40_tx_allowed(priv, ctx, NULL)) {
                /* pure ht40 */
                if (ctx->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 (ctx->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 (ctx->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 */
                                IWL_ERR(priv, "invalid extension channel offset\n");
                                break;
                        }
                }
        } else {
                rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
        }

        if (priv->cfg->ops->hcmd->set_rxon_chain)
                priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);

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

void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf)
{
        struct iwl_rxon_context *ctx;

        for_each_context(priv, ctx)
                _iwl_set_rxon_ht(priv, ht_conf, ctx);
}

/* Return valid, unused, channel for a passive scan to reset the RF */
u8 iwl_get_single_channel_number(struct iwl_priv *priv,
                                 enum ieee80211_band band)
{
        const struct iwl_channel_info *ch_info;
        int i;
        u8 channel = 0;
        u8 min, max;
        struct iwl_rxon_context *ctx;

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

        for (i = min; i < max; i++) {
                bool busy = false;

                for_each_context(priv, ctx) {
                        busy = priv->channel_info[i].channel ==
                                le16_to_cpu(ctx->staging.channel);
                        if (busy)
                                break;
                }

                if (busy)
                        continue;

                channel = priv->channel_info[i].channel;
                ch_info = iwl_get_channel_info(priv, band, channel);
                if (is_channel_valid(ch_info))
                        break;
        }

        return channel;
}

/**
 * iwl_set_rxon_channel - Set the band and channel values in staging RXON
 * @ch: requested channel as a pointer to struct ieee80211_channel

 * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
 * in the staging RXON flag structure based on the ch->band
 */
int iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch,
                         struct iwl_rxon_context *ctx)
{
        enum ieee80211_band band = ch->band;
        u16 channel = ch->hw_value;

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

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

        priv->band = band;

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

        return 0;
}

void iwl_set_flags_for_band(struct iwl_priv *priv,
                            struct iwl_rxon_context *ctx,
                            enum ieee80211_band band,
                            struct ieee80211_vif *vif)
{
        if (band == IEEE80211_BAND_5GHZ) {
                ctx->staging.flags &=
                    ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK
                      | RXON_FLG_CCK_MSK);
                ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
        } else {
                /* Copied from iwl_post_associate() */
                if (vif && vif->bss_conf.use_short_slot)
                        ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
                else
                        ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;

                ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
                ctx->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
                ctx->staging.flags &= ~RXON_FLG_CCK_MSK;
        }
}

/*
 * initialize rxon structure with default values from eeprom
 */
void iwl_connection_init_rx_config(struct iwl_priv *priv,
                                   struct iwl_rxon_context *ctx)
{
        const struct iwl_channel_info *ch_info;

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

        if (!ctx->vif) {
                ctx->staging.dev_type = ctx->unused_devtype;
        } else switch (ctx->vif->type) {
        case NL80211_IFTYPE_AP:
                ctx->staging.dev_type = ctx->ap_devtype;
                break;

        case NL80211_IFTYPE_STATION:
                ctx->staging.dev_type = ctx->station_devtype;
                ctx->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
                break;

        case NL80211_IFTYPE_ADHOC:
                ctx->staging.dev_type = ctx->ibss_devtype;
                ctx->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
                ctx->staging.filter_flags = RXON_FILTER_BCON_AWARE_MSK |
                                                  RXON_FILTER_ACCEPT_GRP_MSK;
                break;

        default:
                IWL_ERR(priv, "Unsupported interface type %d\n",
                        ctx->vif->type);
                break;
        }

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

        ch_info = iwl_get_channel_info(priv, priv->band,
                                       le16_to_cpu(ctx->active.channel));

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

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

        iwl_set_flags_for_band(priv, ctx, priv->band, ctx->vif);

        ctx->staging.ofdm_basic_rates =
            (IWL_OFDM_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
        ctx->staging.cck_basic_rates =
            (IWL_CCK_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;

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

        ctx->staging.ofdm_ht_single_stream_basic_rates = 0xff;
        ctx->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
        ctx->staging.ofdm_ht_triple_stream_basic_rates = 0xff;
}

void iwl_set_rate(struct iwl_priv *priv)
{
        const struct ieee80211_supported_band *hw = NULL;
        struct ieee80211_rate *rate;
        struct iwl_rxon_context *ctx;
        int i;

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

        priv->active_rate = 0;

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

        IWL_DEBUG_RATE(priv, "Set active_rate = %0x\n", priv->active_rate);

        for_each_context(priv, ctx) {
                ctx->staging.cck_basic_rates =
                    (IWL_CCK_BASIC_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;

                ctx->staging.ofdm_basic_rates =
                   (IWL_OFDM_BASIC_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
        }
}

void iwl_chswitch_done(struct iwl_priv *priv, bool is_success)
{
        /*
         * MULTI-FIXME
         * See iwl_mac_channel_switch.
         */
        struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        if (priv->switch_rxon.switch_in_progress) {
                ieee80211_chswitch_done(ctx->vif, is_success);
                mutex_lock(&priv->mutex);
                priv->switch_rxon.switch_in_progress = false;
                mutex_unlock(&priv->mutex);
        }
}

#ifdef CONFIG_IWLWIFI_DEBUG
void iwl_print_rx_config_cmd(struct iwl_priv *priv,
                             struct iwl_rxon_context *ctx)
{
        struct iwl_rxon_cmd *rxon = &ctx->staging;

        IWL_DEBUG_RADIO(priv, "RX CONFIG:\n");
        iwl_print_hex_dump(priv, IWL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
        IWL_DEBUG_RADIO(priv, "u16 channel: 0x%x\n", le16_to_cpu(rxon->channel));
        IWL_DEBUG_RADIO(priv, "u32 flags: 0x%08X\n", le32_to_cpu(rxon->flags));
        IWL_DEBUG_RADIO(priv, "u32 filter_flags: 0x%08x\n",
                        le32_to_cpu(rxon->filter_flags));
        IWL_DEBUG_RADIO(priv, "u8 dev_type: 0x%x\n", rxon->dev_type);
        IWL_DEBUG_RADIO(priv, "u8 ofdm_basic_rates: 0x%02x\n",
                        rxon->ofdm_basic_rates);
        IWL_DEBUG_RADIO(priv, "u8 cck_basic_rates: 0x%02x\n", rxon->cck_basic_rates);
        IWL_DEBUG_RADIO(priv, "u8[6] node_addr: %pM\n", rxon->node_addr);
        IWL_DEBUG_RADIO(priv, "u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
        IWL_DEBUG_RADIO(priv, "u16 assoc_id: 0x%x\n", le16_to_cpu(rxon->assoc_id));
}
#endif
/**
 * iwl_irq_handle_error - called for HW or SW error interrupt from card
 */
void iwl_irq_handle_error(struct iwl_priv *priv)
{
        unsigned int reload_msec;
        unsigned long reload_jiffies;

        /* Set the FW error flag -- cleared on iwl_down */
        set_bit(STATUS_FW_ERROR, &priv->status);

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

        /* W/A for WiFi/WiMAX coex and WiMAX own the RF */
        if (priv->cfg->internal_wimax_coex &&
            (!(iwl_read_prph(priv, APMG_CLK_CTRL_REG) &
                        APMS_CLK_VAL_MRB_FUNC_MODE) ||
             (iwl_read_prph(priv, APMG_PS_CTRL_REG) &
                        APMG_PS_CTRL_VAL_RESET_REQ))) {
                wake_up_interruptible(&priv->wait_command_queue);
                /*
                 *Keep the restart process from trying to send host
                 * commands by clearing the INIT status bit
                 */
                clear_bit(STATUS_READY, &priv->status);
                IWL_ERR(priv, "RF is used by WiMAX\n");
                return;
        }

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

        priv->cfg->ops->lib->dump_nic_error_log(priv);
        if (priv->cfg->ops->lib->dump_csr)
                priv->cfg->ops->lib->dump_csr(priv);
        if (priv->cfg->ops->lib->dump_fh)
                priv->cfg->ops->lib->dump_fh(priv, NULL, false);
        priv->cfg->ops->lib->dump_nic_event_log(priv, false, NULL, false);
#ifdef CONFIG_IWLWIFI_DEBUG
        if (iwl_get_debug_level(priv) & IWL_DL_FW_ERRORS)
                iwl_print_rx_config_cmd(priv,
                                        &priv->contexts[IWL_RXON_CTX_BSS]);
#endif

        wake_up_interruptible(&priv->wait_command_queue);

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

        /*
         * If firmware keep reloading, then it indicate something
         * serious wrong and firmware having problem to recover
         * from it. Instead of keep trying which will fill the syslog
         * and hang the system, let's just stop it
         */
        reload_jiffies = jiffies;
        reload_msec = jiffies_to_msecs((long) reload_jiffies -
                                (long) priv->reload_jiffies);
        priv->reload_jiffies = reload_jiffies;
        if (reload_msec <= IWL_MIN_RELOAD_DURATION) {
                priv->reload_count++;
                if (priv->reload_count >= IWL_MAX_CONTINUE_RELOAD_CNT) {
                        IWL_ERR(priv, "BUG_ON, Stop restarting\n");
                        return;
                }
        } else
                priv->reload_count = 0;

        if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) {
                IWL_DEBUG(priv, IWL_DL_FW_ERRORS,
                          "Restarting adapter due to uCode error.\n");

                if (priv->cfg->mod_params->restart_fw)
                        queue_work(priv->workqueue, &priv->restart);
        }
}

static int iwl_apm_stop_master(struct iwl_priv *priv)
{
        int ret = 0;

        /* stop device's busmaster DMA activity */
        iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);

        ret = iwl_poll_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_MASTER_DISABLED,
                        CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
        if (ret)
                IWL_WARN(priv, "Master Disable Timed Out, 100 usec\n");

        IWL_DEBUG_INFO(priv, "stop master\n");

        return ret;
}

void iwl_apm_stop(struct iwl_priv *priv)
{
        IWL_DEBUG_INFO(priv, "Stop card, put in low power state\n");

        /* Stop device's DMA activity */
        iwl_apm_stop_master(priv);

        /* Reset the entire device */
        iwl_set_bit(priv, 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.
         */
        iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
}


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

        IWL_DEBUG_INFO(priv, "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) */
        iwl_set_bit(priv, 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)
         */
        iwl_set_bit(priv, 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) */
        iwl_set_bit(priv, 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)
         */
        iwl_set_bit(priv, 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 (priv->cfg->base_params->set_l0s) {
                lctl = iwl_pcie_link_ctl(priv);
                if ((lctl & PCI_CFG_LINK_CTRL_VAL_L1_EN) ==
                                        PCI_CFG_LINK_CTRL_VAL_L1_EN) {
                        /* L1-ASPM enabled; disable(!) L0S  */
                        iwl_set_bit(priv, CSR_GIO_REG,
                                        CSR_GIO_REG_VAL_L0S_ENABLED);
                        IWL_DEBUG_POWER(priv, "L1 Enabled; Disabling L0S\n");
                } else {
                        /* L1-ASPM disabled; enable(!) L0S */
                        iwl_clear_bit(priv, CSR_GIO_REG,
                                        CSR_GIO_REG_VAL_L0S_ENABLED);
                        IWL_DEBUG_POWER(priv, "L1 Disabled; Enabling L0S\n");
                }
        }

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

        /*
         * Set "initialization complete" bit to move adapter from
         * D0U* --> D0A* (powered-up active) state.
         */
        iwl_set_bit(priv, 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. iwl_write_prph()
         * and accesses to uCode SRAM.
         */
        ret = iwl_poll_bit(priv, CSR_GP_CNTRL,
                        CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
                        CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
        if (ret < 0) {
                IWL_DEBUG_INFO(priv, "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;
         * later devices (i.e. 5000 and later) have non-volatile SRAM,
         * and don't need BSM to restore data after power-saving sleep.
         *
         * 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 (priv->cfg->base_params->use_bsm)
                iwl_write_prph(priv, APMG_CLK_EN_REG,
                        APMG_CLK_VAL_DMA_CLK_RQT | APMG_CLK_VAL_BSM_CLK_RQT);
        else
                iwl_write_prph(priv, APMG_CLK_EN_REG,
                        APMG_CLK_VAL_DMA_CLK_RQT);
        udelay(20);

        /* Disable L1-Active */
        iwl_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
                          APMG_PCIDEV_STT_VAL_L1_ACT_DIS);

out:
        return ret;
}


int iwl_set_tx_power(struct iwl_priv *priv, s8 tx_power, bool force)
{
        int ret;
        s8 prev_tx_power;
        bool defer;
        struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];

        lockdep_assert_held(&priv->mutex);

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

        if (!priv->cfg->ops->lib->send_tx_power)
                return -EOPNOTSUPP;

        if (tx_power < IWLAGN_TX_POWER_TARGET_POWER_MIN) {
                IWL_WARN(priv,
                         "Requested user TXPOWER %d below lower limit %d.\n",
                         tx_power,
                         IWLAGN_TX_POWER_TARGET_POWER_MIN);
                return -EINVAL;
        }

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

        if (!iwl_is_ready_rf(priv))
                return -EIO;

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

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

        prev_tx_power = priv->tx_power_user_lmt;
        priv->tx_power_user_lmt = tx_power;

        ret = priv->cfg->ops->lib->send_tx_power(priv);

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

void iwl_send_bt_config(struct iwl_priv *priv)
{
        struct iwl_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;

        priv->bt_enable_flag = bt_cmd.flags;
        IWL_DEBUG_INFO(priv, "BT coex %s\n",
                (bt_cmd.flags == BT_COEX_DISABLE) ? "disable" : "active");

        if (iwl_send_cmd_pdu(priv, REPLY_BT_CONFIG,
                             sizeof(struct iwl_bt_cmd), &bt_cmd))
                IWL_ERR(priv, "failed to send BT Coex Config\n");
}

int iwl_send_statistics_request(struct iwl_priv *priv, u8 flags, bool clear)
{
        struct iwl_statistics_cmd statistics_cmd = {
                .configuration_flags =
                        clear ? IWL_STATS_CONF_CLEAR_STATS : 0,
        };

        if (flags & CMD_ASYNC)
                return iwl_send_cmd_pdu_async(priv, REPLY_STATISTICS_CMD,
                                               sizeof(struct iwl_statistics_cmd),
                                               &statistics_cmd, NULL);
        else
                return iwl_send_cmd_pdu(priv, REPLY_STATISTICS_CMD,
                                        sizeof(struct iwl_statistics_cmd),
                                        &statistics_cmd);
}

void iwl_clear_isr_stats(struct iwl_priv *priv)
{
        memset(&priv->isr_stats, 0, sizeof(priv->isr_stats));
}

int iwl_mac_conf_tx(struct ieee80211_hw *hw, u16 queue,
                           const struct ieee80211_tx_queue_params *params)
{
        struct iwl_priv *priv = hw->priv;
        struct iwl_rxon_context *ctx;
        unsigned long flags;
        int q;

        IWL_DEBUG_MAC80211(priv, "enter\n");

        if (!iwl_is_ready_rf(priv)) {
                IWL_DEBUG_MAC80211(priv, "leave - RF not ready\n");
                return -EIO;
        }

        if (queue >= AC_NUM) {
                IWL_DEBUG_MAC80211(priv, "leave - queue >= AC_NUM %d\n", queue);
                return 0;
        }

        q = AC_NUM - 1 - queue;

        spin_lock_irqsave(&priv->lock, flags);

        /*
         * MULTI-FIXME
         * This may need to be done per interface in nl80211/cfg80211/mac80211.
         */
        for_each_context(priv, ctx) {
                ctx->qos_data.def_qos_parm.ac[q].cw_min =
                        cpu_to_le16(params->cw_min);
                ctx->qos_data.def_qos_parm.ac[q].cw_max =
                        cpu_to_le16(params->cw_max);
                ctx->qos_data.def_qos_parm.ac[q].aifsn = params->aifs;
                ctx->qos_data.def_qos_parm.ac[q].edca_txop =
                                cpu_to_le16((params->txop * 32));

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

        spin_unlock_irqrestore(&priv->lock, flags);

        IWL_DEBUG_MAC80211(priv, "leave\n");
        return 0;
}

int iwl_mac_tx_last_beacon(struct ieee80211_hw *hw)
{
        struct iwl_priv *priv = hw->priv;

        return priv->ibss_manager == IWL_IBSS_MANAGER;
}

static int iwl_set_mode(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
{
        iwl_connection_init_rx_config(priv, ctx);

        if (priv->cfg->ops->hcmd->set_rxon_chain)
                priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);

        return iwlcore_commit_rxon(priv, ctx);
}

static int iwl_setup_interface(struct iwl_priv *priv,
                               struct iwl_rxon_context *ctx)
{
        struct ieee80211_vif *vif = ctx->vif;
        int err;

        lockdep_assert_held(&priv->mutex);

        /*
         * This variable will be correct only when there's just
         * a single context, but all code using it is for hardware
         * that supports only one context.
         */
        priv->iw_mode = vif->type;

        ctx->is_active = true;

        err = iwl_set_mode(priv, ctx);
        if (err) {
                if (!ctx->always_active)
                        ctx->is_active = false;
                return err;
        }

        if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist &&
            vif->type == NL80211_IFTYPE_ADHOC) {
                /*
                 * pretend to have high BT traffic as long as we
                 * are operating in IBSS mode, as this will cause
                 * the rate scaling etc. to behave as intended.
                 */
                priv->bt_traffic_load = IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
        }

        return 0;
}

int iwl_mac_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
        struct iwl_priv *priv = hw->priv;
        struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
        struct iwl_rxon_context *tmp, *ctx = NULL;
        int err;
        enum nl80211_iftype viftype = ieee80211_vif_type_p2p(vif);

        IWL_DEBUG_MAC80211(priv, "enter: type %d, addr %pM\n",
                           viftype, vif->addr);

        mutex_lock(&priv->mutex);

        if (!iwl_is_ready_rf(priv)) {
                IWL_WARN(priv, "Try to add interface when device not ready\n");
                err = -EINVAL;
                goto out;
        }

        for_each_context(priv, tmp) {
                u32 possible_modes =
                        tmp->interface_modes | tmp->exclusive_interface_modes;

                if (tmp->vif) {
                        /* check if this busy context is exclusive */
                        if (tmp->exclusive_interface_modes &
                                                BIT(tmp->vif->type)) {
                                err = -EINVAL;
                                goto out;
                        }
                        continue;
                }

                if (!(possible_modes & BIT(viftype)))
                        continue;

                /* have maybe usable context w/o interface */
                ctx = tmp;
                break;
        }

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

        vif_priv->ctx = ctx;
        ctx->vif = vif;

        err = iwl_setup_interface(priv, ctx);
        if (!err)
                goto out;

        ctx->vif = NULL;
        priv->iw_mode = NL80211_IFTYPE_STATION;
 out:
        mutex_unlock(&priv->mutex);

        IWL_DEBUG_MAC80211(priv, "leave\n");
        return err;
}

static void iwl_teardown_interface(struct iwl_priv *priv,
                                   struct ieee80211_vif *vif,
                                   bool mode_change)
{
        struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);

        lockdep_assert_held(&priv->mutex);

        if (priv->scan_vif == vif) {
                iwl_scan_cancel_timeout(priv, 200);
                iwl_force_scan_end(priv);
        }

        if (!mode_change) {
                iwl_set_mode(priv, ctx);
                if (!ctx->always_active)
                        ctx->is_active = false;
        }

        /*
         * When removing the IBSS interface, overwrite the
         * BT traffic load with the stored one from the last
         * notification, if any. If this is a device that
         * doesn't implement this, this has no effect since
         * both values are the same and zero.
         */
        if (vif->type == NL80211_IFTYPE_ADHOC)
                priv->bt_traffic_load = priv->last_bt_traffic_load;
}

void iwl_mac_remove_interface(struct ieee80211_hw *hw,
                              struct ieee80211_vif *vif)
{
        struct iwl_priv *priv = hw->priv;
        struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);

        IWL_DEBUG_MAC80211(priv, "enter\n");

        mutex_lock(&priv->mutex);

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

        iwl_teardown_interface(priv, vif, false);

        memset(priv->bssid, 0, ETH_ALEN);
        mutex_unlock(&priv->mutex);

        IWL_DEBUG_MAC80211(priv, "leave\n");

}

int iwl_alloc_txq_mem(struct iwl_priv *priv)
{
        if (!priv->txq)
                priv->txq = kzalloc(
                        sizeof(struct iwl_tx_queue) *
                                priv->cfg->base_params->num_of_queues,
                        GFP_KERNEL);
        if (!priv->txq) {
                IWL_ERR(priv, "Not enough memory for txq\n");
                return -ENOMEM;
        }
        return 0;
}

void iwl_free_txq_mem(struct iwl_priv *priv)
{
        kfree(priv->txq);
        priv->txq = NULL;
}

#ifdef CONFIG_IWLWIFI_DEBUGFS

#define IWL_TRAFFIC_DUMP_SIZE   (IWL_TRAFFIC_ENTRY_SIZE * IWL_TRAFFIC_ENTRIES)

void iwl_reset_traffic_log(struct iwl_priv *priv)
{
        priv->tx_traffic_idx = 0;
        priv->rx_traffic_idx = 0;
        if (priv->tx_traffic)
                memset(priv->tx_traffic, 0, IWL_TRAFFIC_DUMP_SIZE);
        if (priv->rx_traffic)
                memset(priv->rx_traffic, 0, IWL_TRAFFIC_DUMP_SIZE);
}

int iwl_alloc_traffic_mem(struct iwl_priv *priv)
{
        u32 traffic_size = IWL_TRAFFIC_DUMP_SIZE;

        if (iwl_debug_level & IWL_DL_TX) {
                if (!priv->tx_traffic) {
                        priv->tx_traffic =
                                kzalloc(traffic_size, GFP_KERNEL);
                        if (!priv->tx_traffic)
                                return -ENOMEM;
                }
        }
        if (iwl_debug_level & IWL_DL_RX) {
                if (!priv->rx_traffic) {
                        priv->rx_traffic =
                                kzalloc(traffic_size, GFP_KERNEL);
                        if (!priv->rx_traffic)
                                return -ENOMEM;
                }
        }
        iwl_reset_traffic_log(priv);
        return 0;
}

void iwl_free_traffic_mem(struct iwl_priv *priv)
{
        kfree(priv->tx_traffic);
        priv->tx_traffic = NULL;

        kfree(priv->rx_traffic);
        priv->rx_traffic = NULL;
}

void iwl_dbg_log_tx_data_frame(struct iwl_priv *priv,
                      u16 length, struct ieee80211_hdr *header)
{
        __le16 fc;
        u16 len;

        if (likely(!(iwl_debug_level & IWL_DL_TX)))
                return;

        if (!priv->tx_traffic)
                return;

        fc = header->frame_control;
        if (ieee80211_is_data(fc)) {
                len = (length > IWL_TRAFFIC_ENTRY_SIZE)
                       ? IWL_TRAFFIC_ENTRY_SIZE : length;
                memcpy((priv->tx_traffic +
                       (priv->tx_traffic_idx * IWL_TRAFFIC_ENTRY_SIZE)),
                       header, len);
                priv->tx_traffic_idx =
                        (priv->tx_traffic_idx + 1) % IWL_TRAFFIC_ENTRIES;
        }
}

void iwl_dbg_log_rx_data_frame(struct iwl_priv *priv,
                      u16 length, struct ieee80211_hdr *header)
{
        __le16 fc;
        u16 len;

        if (likely(!(iwl_debug_level & IWL_DL_RX)))
                return;

        if (!priv->rx_traffic)
                return;

        fc = header->frame_control;
        if (ieee80211_is_data(fc)) {
                len = (length > IWL_TRAFFIC_ENTRY_SIZE)
                       ? IWL_TRAFFIC_ENTRY_SIZE : length;
                memcpy((priv->rx_traffic +
                       (priv->rx_traffic_idx * IWL_TRAFFIC_ENTRY_SIZE)),
                       header, len);
                priv->rx_traffic_idx =
                        (priv->rx_traffic_idx + 1) % IWL_TRAFFIC_ENTRIES;
        }
}

const char *get_mgmt_string(int cmd)
{
        switch (cmd) {
                IWL_CMD(MANAGEMENT_ASSOC_REQ);
                IWL_CMD(MANAGEMENT_ASSOC_RESP);
                IWL_CMD(MANAGEMENT_REASSOC_REQ);
                IWL_CMD(MANAGEMENT_REASSOC_RESP);
                IWL_CMD(MANAGEMENT_PROBE_REQ);
                IWL_CMD(MANAGEMENT_PROBE_RESP);
                IWL_CMD(MANAGEMENT_BEACON);
                IWL_CMD(MANAGEMENT_ATIM);
                IWL_CMD(MANAGEMENT_DISASSOC);
                IWL_CMD(MANAGEMENT_AUTH);
                IWL_CMD(MANAGEMENT_DEAUTH);
                IWL_CMD(MANAGEMENT_ACTION);
        default:
                return "UNKNOWN";

        }
}

const char *get_ctrl_string(int cmd)
{
        switch (cmd) {
                IWL_CMD(CONTROL_BACK_REQ);
                IWL_CMD(CONTROL_BACK);
                IWL_CMD(CONTROL_PSPOLL);
                IWL_CMD(CONTROL_RTS);
                IWL_CMD(CONTROL_CTS);
                IWL_CMD(CONTROL_ACK);
                IWL_CMD(CONTROL_CFEND);
                IWL_CMD(CONTROL_CFENDACK);
        default:
                return "UNKNOWN";

        }
}

void iwl_clear_traffic_stats(struct iwl_priv *priv)
{
        memset(&priv->tx_stats, 0, sizeof(struct traffic_stats));
        memset(&priv->rx_stats, 0, sizeof(struct traffic_stats));
}

/*
 * if CONFIG_IWLWIFI_DEBUGFS defined, iwl_update_stats function will
 * record all the MGMT, CTRL and DATA pkt for both TX and Rx pass.
 * Use debugFs to display the rx/rx_statistics
 * if CONFIG_IWLWIFI_DEBUGFS not being defined, then no MGMT and CTRL
 * information will be recorded, but DATA pkt still will be recorded
 * for the reason of iwl_led.c need to control the led blinking based on
 * number of tx and rx data.
 *
 */
void iwl_update_stats(struct iwl_priv *priv, bool is_tx, __le16 fc, u16 len)
{
        struct traffic_stats    *stats;

        if (is_tx)
                stats = &priv->tx_stats;
        else
                stats = &priv->rx_stats;

        if (ieee80211_is_mgmt(fc)) {
                switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
                case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
                        stats->mgmt[MANAGEMENT_ASSOC_REQ]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
                        stats->mgmt[MANAGEMENT_ASSOC_RESP]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
                        stats->mgmt[MANAGEMENT_REASSOC_REQ]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
                        stats->mgmt[MANAGEMENT_REASSOC_RESP]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
                        stats->mgmt[MANAGEMENT_PROBE_REQ]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
                        stats->mgmt[MANAGEMENT_PROBE_RESP]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_BEACON):
                        stats->mgmt[MANAGEMENT_BEACON]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_ATIM):
                        stats->mgmt[MANAGEMENT_ATIM]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
                        stats->mgmt[MANAGEMENT_DISASSOC]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_AUTH):
                        stats->mgmt[MANAGEMENT_AUTH]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
                        stats->mgmt[MANAGEMENT_DEAUTH]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_ACTION):
                        stats->mgmt[MANAGEMENT_ACTION]++;
                        break;
                }
        } else if (ieee80211_is_ctl(fc)) {
                switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
                case cpu_to_le16(IEEE80211_STYPE_BACK_REQ):
                        stats->ctrl[CONTROL_BACK_REQ]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_BACK):
                        stats->ctrl[CONTROL_BACK]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_PSPOLL):
                        stats->ctrl[CONTROL_PSPOLL]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_RTS):
                        stats->ctrl[CONTROL_RTS]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_CTS):
                        stats->ctrl[CONTROL_CTS]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_ACK):
                        stats->ctrl[CONTROL_ACK]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_CFEND):
                        stats->ctrl[CONTROL_CFEND]++;
                        break;
                case cpu_to_le16(IEEE80211_STYPE_CFENDACK):
                        stats->ctrl[CONTROL_CFENDACK]++;
                        break;
                }
        } else {
                /* data */
                stats->data_cnt++;
                stats->data_bytes += len;
        }
}
#endif

static void iwl_force_rf_reset(struct iwl_priv *priv)
{
        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

        if (!iwl_is_any_associated(priv)) {
                IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n");
                return;
        }
        /*
         * There is no easy and better way to force reset the radio,
         * the only known method is switching channel which will force to
         * reset and tune the radio.
         * Use internal short scan (single channel) operation to should
         * achieve this objective.
         * Driver should reset the radio when number of consecutive missed
         * beacon, or any other uCode error condition detected.
         */
        IWL_DEBUG_INFO(priv, "perform radio reset.\n");
        iwl_internal_short_hw_scan(priv);
}


int iwl_force_reset(struct iwl_priv *priv, int mode, bool external)
{
        struct iwl_force_reset *force_reset;

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return -EINVAL;

        if (mode >= IWL_MAX_FORCE_RESET) {
                IWL_DEBUG_INFO(priv, "invalid reset request.\n");
                return -EINVAL;
        }
        force_reset = &priv->force_reset[mode];
        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)) {
                        IWL_DEBUG_INFO(priv, "force reset rejected\n");
                        force_reset->reset_reject_count++;
                        return -EAGAIN;
                }
        }
        force_reset->reset_success_count++;
        force_reset->last_force_reset_jiffies = jiffies;
        IWL_DEBUG_INFO(priv, "perform force reset (%d)\n", mode);
        switch (mode) {
        case IWL_RF_RESET:
                iwl_force_rf_reset(priv);
                break;
        case IWL_FW_RESET:
                /*
                 * 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 && !priv->cfg->mod_params->restart_fw) {
                        IWL_DEBUG_INFO(priv, "Cancel firmware reload based on "
                                       "module parameter setting\n");
                        break;
                }
                IWL_ERR(priv, "On demand firmware reload\n");
                /* Set the FW error flag -- cleared on iwl_down */
                set_bit(STATUS_FW_ERROR, &priv->status);
                wake_up_interruptible(&priv->wait_command_queue);
                /*
                 * Keep the restart process from trying to send host
                 * commands by clearing the INIT status bit
                 */
                clear_bit(STATUS_READY, &priv->status);
                queue_work(priv->workqueue, &priv->restart);
                break;
        }
        return 0;
}

int iwl_mac_change_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
                             enum nl80211_iftype newtype, bool newp2p)
{
        struct iwl_priv *priv = hw->priv;
        struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
        struct iwl_rxon_context *tmp;
        u32 interface_modes;
        int err;

        newtype = ieee80211_iftype_p2p(newtype, newp2p);

        mutex_lock(&priv->mutex);

        interface_modes = ctx->interface_modes | ctx->exclusive_interface_modes;

        if (!(interface_modes & BIT(newtype))) {
                err = -EBUSY;
                goto out;
        }

        if (ctx->exclusive_interface_modes & BIT(newtype)) {
                for_each_context(priv, tmp) {
                        if (ctx == tmp)
                                continue;

                        if (!tmp->vif)
                                continue;

                        /*
                         * The current mode switch would be exclusive, but
                         * another context is active ... refuse the switch.
                         */
                        err = -EBUSY;
                        goto out;
                }
        }

        /* success */
        iwl_teardown_interface(priv, vif, true);
        vif->type = newtype;
        err = iwl_setup_interface(priv, ctx);
        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:
        mutex_unlock(&priv->mutex);
        return err;
}

/*
 * 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 iwl_check_stuck_queue(struct iwl_priv *priv, int cnt)
{
        struct iwl_tx_queue *txq = &priv->txq[cnt];
        struct iwl_queue *q = &txq->q;
        unsigned long timeout;
        int ret;

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

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

        if (time_after(jiffies, timeout)) {
                IWL_ERR(priv, "Queue %d stuck for %u ms.\n",
                                q->id, priv->cfg->base_params->wd_timeout);
                ret = iwl_force_reset(priv, IWL_FW_RESET, 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 IWL_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 iwl_bg_watchdog(unsigned long data)
{
        struct iwl_priv *priv = (struct iwl_priv *)data;
        int cnt;
        unsigned long timeout;

        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                return;

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

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

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

        mod_timer(&priv->watchdog, jiffies +
                  msecs_to_jiffies(IWL_WD_TICK(timeout)));
}

void iwl_setup_watchdog(struct iwl_priv *priv)
{
        unsigned int timeout = priv->cfg->base_params->wd_timeout;

        if (timeout)
                mod_timer(&priv->watchdog,
                          jiffies + msecs_to_jiffies(IWL_WD_TICK(timeout)));
        else
                del_timer(&priv->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 iwl_usecs_to_beacons(struct iwl_priv *priv, u32 usec, u32 beacon_interval)
{
        u32 quot;
        u32 rem;
        u32 interval = beacon_interval * TIME_UNIT;

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

        quot = (usec / interval) &
                (iwl_beacon_time_mask_high(priv,
                priv->hw_params.beacon_time_tsf_bits) >>
                priv->hw_params.beacon_time_tsf_bits);
        rem = (usec % interval) & iwl_beacon_time_mask_low(priv,
                                   priv->hw_params.beacon_time_tsf_bits);

        return (quot << priv->hw_params.beacon_time_tsf_bits) + rem;
}

/* base is usually what we get from ucode with each received frame,
 * the same as HW timer counter counting down
 */
__le32 iwl_add_beacon_time(struct iwl_priv *priv, u32 base,
                           u32 addon, u32 beacon_interval)
{
        u32 base_low = base & iwl_beacon_time_mask_low(priv,
                                        priv->hw_params.beacon_time_tsf_bits);
        u32 addon_low = addon & iwl_beacon_time_mask_low(priv,
                                        priv->hw_params.beacon_time_tsf_bits);
        u32 interval = beacon_interval * TIME_UNIT;
        u32 res = (base & iwl_beacon_time_mask_high(priv,
                                priv->hw_params.beacon_time_tsf_bits)) +
                                (addon & iwl_beacon_time_mask_high(priv,
                                priv->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 << priv->hw_params.beacon_time_tsf_bits);
        } else
                res += (1 << priv->hw_params.beacon_time_tsf_bits);

        return cpu_to_le32(res);
}

#ifdef CONFIG_PM

int iwl_pci_suspend(struct device *device)
{
        struct pci_dev *pdev = to_pci_dev(device);
        struct iwl_priv *priv = pci_get_drvdata(pdev);

        /*
         * This function is called when system goes into suspend state
         * mac80211 will call iwl_mac_stop() from the mac80211 suspend function
         * first but since iwl_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.
         */
        iwl_apm_stop(priv);

        return 0;
}

int iwl_pci_resume(struct device *device)
{
        struct pci_dev *pdev = to_pci_dev(device);
        struct iwl_priv *priv = 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);

        iwl_enable_interrupts(priv);

        if (!(iwl_read32(priv, CSR_GP_CNTRL) &
                                CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
                hw_rfkill = true;

        if (hw_rfkill)
                set_bit(STATUS_RF_KILL_HW, &priv->status);
        else
                clear_bit(STATUS_RF_KILL_HW, &priv->status);

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

        return 0;
}

const struct dev_pm_ops iwl_pm_ops = {
        .suspend = iwl_pci_suspend,
        .resume = iwl_pci_resume,
        .freeze = iwl_pci_suspend,
        .thaw = iwl_pci_resume,
        .poweroff = iwl_pci_suspend,
        .restore = iwl_pci_resume,
};

#endif /* CONFIG_PM */