iwlegacy: merge common header files

[deliverable/linux.git] / drivers / net / wireless / iwlegacy / common.c

/******************************************************************************
 *
 * 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 <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 <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 "iwl-eeprom.h"
#include "iwl-debug.h"
#include "common.h"
#include "iwl-power.h"

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_RF_KILL_HW, &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->base_params->led_compensation);
        led_cmd.on = il_blink_compensation(il, on,
                                il->cfg->base_params->led_compensation);
        led_cmd.off = il_blink_compensation(il, off,
                                il->cfg->base_params->led_compensation);

        ret = il->cfg->ops->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->base_params->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);

/**
 * il_eeprom_init - read EEPROM contents
 *
 * Load the EEPROM contents from adapter into il->eeprom
 *
 * NOTE:  This routine uses the non-debug IO access functions.
 */
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->base_params->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->cfg->ops->lib->apm_ops.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->cfg->ops->lib->eeprom_ops.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->cfg->ops->lib->eeprom_ops.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->ops->lib->
                        eeprom_ops.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 " " : "")
/**
 * il_mod_ht40_chan_info - Copy ht40 channel info into driver's il.
 *
 * Does not set up a command, or touch hardware.
 */
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 " " : "")

/**
 * il_init_channel_map - Set up driver's info for all possible channels
 */
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->ops->lib->eeprom_ops.regulatory_bands[5] ==
            EEPROM_REGULATORY_BAND_NO_HT40 &&
            il->cfg->ops->lib->eeprom_ops.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);

/**
 * il_get_channel_info - Find driver's ilate channel info
 *
 * Based on band and channel number.
 */
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->cfg->ops->lib->update_chain_flags && update_chains)
                        il->cfg->ops->lib->update_chain_flags(il);
                else if (il->cfg->ops->lib->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");
}

/**
 * il_scan_cancel - Cancel any currently executing HW scan
 */
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);

/**
 * il_scan_cancel_timeout - Cancel any currently executing HW scan
 * @ms: amount of time to wait (in milliseconds) for scan to abort
 *
 */
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)
{
        struct il_rxon_context *ctx = &il->ctx;
        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 = ctx->vif ? ctx->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);

        if (WARN_ON(!il->cfg->ops->utils->request_scan))
                return -EOPNOTSUPP;

        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->cfg->ops->utils->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;

        D_MAC80211("enter\n");

        if (req->n_channels == 0)
                return -EINVAL;

        mutex_lock(&il->mutex);

        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);

        D_MAC80211("leave\n");

out_unlock:
        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);
}

/**
 * il_fill_probe_req - fill in all required fields and IE for probe request
 */

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);
        memcpy(frame->da, il_bcast_addr, ETH_ALEN);
        memcpy(frame->sa, ta, ETH_ALEN);
        memcpy(frame->bssid, il_bcast_addr, ETH_ALEN);
        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->cfg->ops->utils->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->cfg->ops->utils->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 il_rxon_context *ctx)
{
        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, ctx, &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;
}

/**
 * il_prep_station - Prepare station information for addition
 *
 * should be called with sta_lock held
 */
u8 il_prep_station(struct il_priv *il, struct il_rxon_context *ctx,
                    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 = ctx->ap_sta_id;
        else if (is_broadcast_ether_addr(addr))
                sta_id = ctx->bcast_sta_id;
        else
                for (i = IL_STA_ID; i < il->hw_params.max_stations; i++) {
                        if (!compare_ether_addr(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) &&
            !compare_ether_addr(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 = ctx->station_flags;
        station->ctxid = ctx->ctxid;

        if (sta) {
                struct il_station_priv_common *sta_priv;

                sta_priv = (void *)sta->drv_priv;
                sta_priv->ctx = ctx;
        }

        /*
         * 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, ctx);

        /* 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)

/**
 * il_add_station_common -
 */
int
il_add_station_common(struct il_priv *il,
                        struct il_rxon_context *ctx,
                           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, ctx, 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);

/**
 * il_sta_ucode_deactivate - deactivate ucode status for a station
 *
 * il->sta_lock must be held
 */
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;
}

/**
 * il_remove_station - Remove driver's knowledge of station.
 */
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);

/**
 * il_clear_ucode_stations - clear ucode station table bits
 *
 * This function clears all the bits in the driver indicating
 * which stations are active in the ucode. Call when something
 * other than explicit station management would cause this in
 * the ucode, e.g. unassociated RXON.
 */
void il_clear_ucode_stations(struct il_priv *il,
                              struct il_rxon_context *ctx)
{
        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 (ctx && ctx->ctxid != il->stations[i].ctxid)
                        continue;

                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);

/**
 * il_restore_stations() - Restore driver known stations to device
 *
 * All stations considered active by driver, but not present in ucode, is
 * restored.
 *
 * Function sleeps.
 */
void
il_restore_stations(struct il_priv *il, struct il_rxon_context *ctx)
{
        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 (ctx->ctxid != il->stations[i].ctxid)
                        continue;
                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, ctx, &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

/**
 * il_is_lq_table_valid() - Test one aspect of LQ cmd for validity
 *
 * It sometimes happens when a HT rate has been in use and we
 * loose connectivity with AP then mac80211 will first tell us that the
 * current channel is not HT anymore before removing the station. In such a
 * scenario the RXON flags will be updated to indicate we are not
 * communicating HT anymore, but the LQ command may still contain HT rates.
 * Test for this to prevent driver from sending LQ command between the time
 * RXON flags are updated and when LQ command is updated.
 */
static bool il_is_lq_table_valid(struct il_priv *il,
                              struct il_rxon_context *ctx,
                              struct il_link_quality_cmd *lq)
{
        int i;

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

        D_INFO("Channel %u is not an HT channel\n",
                       ctx->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;
}

/**
 * il_send_lq_cmd() - Send link quality command
 * @init: This command is sent as part of station initialization right
 *        after station has been added.
 *
 * The link quality command is sent as the last step of station creation.
 * This is the special case in which init is set and we call a callback in
 * this case to clear the state indicating that station creation is in
 * progress.
 */
int il_send_lq_cmd(struct il_priv *il, struct il_rxon_context *ctx,
                    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, ctx, 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;

        D_INFO("received request to remove station %pM\n",
                        sta->addr);
        mutex_lock(&il->mutex);
        D_INFO("proceeding to remove 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);
        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.
 * ...
 *
 */

/**
 * il_rx_queue_space - Return number of free slots available in queue.
 */
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);

/**
 * il_rx_queue_update_write_ptr - Update the write pointer for the RX queue
 */
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->ctx.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);

/**
 * il_txq_update_write_ptr - Send new write idx to hardware
 */
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);

/**
 * il_tx_queue_unmap -  Unmap any remaining DMA mappings and free skb's
 */
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->cfg->ops->lib->txq_free_tfd(il, txq);
                q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
        }
}
EXPORT_SYMBOL(il_tx_queue_unmap);

/**
 * il_tx_queue_free - Deallocate DMA queue.
 * @txq: Transmit queue to deallocate.
 *
 * Empty queue by removing and destroying all BD's.
 * Free all buffers.
 * 0-fill, but do not free "txq" descriptor structure.
 */
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->txb);
        txq->txb = 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);

/**
 * il_cmd_queue_unmap - Unmap any remaining DMA mappings from command queue
 */
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);

/**
 * il_cmd_queue_free - Deallocate DMA queue.
 * @txq: Transmit queue to deallocate.
 *
 * Empty queue by removing and destroying all BD's.
 * Free all buffers.
 * 0-fill, but do not free "txq" descriptor structure.
 */
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);


/**
 * il_queue_init - Initialize queue's high/low-water and read/write idxes
 */
static int il_queue_init(struct il_priv *il, struct il_queue *q,
                          int count, int slots_num, u32 id)
{
        q->n_bd = count;
        q->n_win = slots_num;
        q->id = id;

        /* count must be power-of-two size, otherwise il_queue_inc_wrap
         * and il_queue_dec_wrap are broken. */
        BUG_ON(!is_power_of_2(count));

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

        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;
}

/**
 * il_tx_queue_alloc - Alloc driver data and TFD CB for one Tx/cmd queue
 */
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->txb = kzalloc(sizeof(txq->txb[0]) *
                                   TFD_QUEUE_SIZE_MAX, GFP_KERNEL);
                if (!txq->txb) {
                        IL_ERR("kmalloc for auxiliary BD "
                                  "structures failed\n");
                        goto error;
                }
        } else {
                txq->txb = 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("pci_alloc_consistent(%zd) failed\n", tfd_sz);
                goto error;
        }
        txq->q.id = id;

        return 0;

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

        return -ENOMEM;
}

/**
 * il_tx_queue_init - Allocate and initialize one tx/cmd queue
 */
int il_tx_queue_init(struct il_priv *il, struct il_tx_queue *txq,
                      int slots_num, u32 txq_id)
{
        int i, len;
        int ret;
        int actual_slots = slots_num;

        /*
         * 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)
                actual_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_num)
                        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);

        /* 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));

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

        /* Tell device where to find queue */
        il->cfg->ops->lib->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, struct il_tx_queue *txq,
                        int slots_num, u32 txq_id)
{
        int actual_slots = slots_num;

        if (txq_id == il->cmd_queue)
                actual_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,
                                TFD_QUEUE_SIZE_MAX, slots_num, txq_id);

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

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

/**
 * il_enqueue_hcmd - enqueue a uCode command
 * @il: device ilate data point
 * @cmd: a point to the ucode command structure
 *
 * The function returns < 0 values to indicate the operation is
 * failed. On success, it turns the idx (> 0) of command in the
 * command queue.
 */
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->cfg->ops->utils->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->cfg->ops->lib->txq_update_byte_cnt_tbl)
                /* Set up entry in queue's byte count circular buffer */
                il->cfg->ops->lib->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->cfg->ops->lib->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;
}

/**
 * il_hcmd_queue_reclaim - Reclaim TX command queue entries already Tx'd
 *
 * When FW advances 'R' idx, all entries between old and new 'R' idx
 * need to be reclaimed. As result, some free space forms.  If there is
 * enough free space (> low mark), wake the stack that feeds us.
 */
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);
                }

        }
}

/**
 * il_tx_cmd_complete - Pull unused buffers off the queue and reclaim them
 * @rxb: Rx buffer to reclaim
 *
 * If an Rx buffer has an async callback associated with it the callback
 * will be executed.  The attached skb (if present) will only be freed
 * if the callback returns 1
 */
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);


/* This function both allocates and initializes hw and il. */
struct ieee80211_hw *il_alloc_all(struct il_cfg *cfg)
{
        struct il_priv *il;
        /* mac80211 allocates memory for this device instance, including
         *   space for this driver's ilate structure */
        struct ieee80211_hw *hw;

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

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

out:
        return hw;
}
EXPORT_SYMBOL(il_alloc_all);

#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);
        }
}

/**
 * il_init_geos - Initialize mac80211's geo/channel info based from eeprom
 */
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 il_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_IWLEGACY_DEBUGFS
        if (il->disable_ht40)
                return false;
#endif

        return il_is_channel_extension(il, il->band,
                        le16_to_cpu(ctx->staging.channel),
                        ctx->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, struct il_rxon_context *ctx)
{
        u64 tsf;
        s32 interval_tm, rem;
        struct ieee80211_conf *conf = NULL;
        u16 beacon_int;
        struct ieee80211_vif *vif = ctx->vif;

        conf = &il->hw->conf;

        lockdep_assert_held(&il->mutex);

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

        ctx->timing.timestamp = cpu_to_le64(il->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_win from mac80211,
         *       for now just always use 0
         */
        ctx->timing.atim_win = 0;

        beacon_int = il_adjust_beacon_interval(beacon_int,
                        il->hw_params.max_beacon_itrvl * TIME_UNIT);
        ctx->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);
        ctx->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);

        ctx->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(ctx->timing.beacon_interval),
                        le32_to_cpu(ctx->timing.beacon_init_val),
                        le16_to_cpu(ctx->timing.atim_win));

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

void
il_set_rxon_hwcrypto(struct il_priv *il,
                                struct il_rxon_context *ctx,
                                int hw_decrypt)
{
        struct il_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;

}
EXPORT_SYMBOL(il_set_rxon_hwcrypto);

/* validate RXON structure is valid */
int
il_check_rxon_cmd(struct il_priv *il, struct il_rxon_context *ctx)
{
        struct il_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) {
                        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);

/**
 * il_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
 * @il: 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 il_full_rxon_required(struct il_priv *il,
                           struct il_rxon_context *ctx)
{
        const struct il_rxon_cmd *staging = &ctx->staging;
        const struct il_rxon_cmd *active = &ctx->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_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->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,
                            struct il_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 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_context *ctx)
{
        struct il_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;
        }

        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 (il_is_ht40_tx_allowed(il, 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 */
                                IL_ERR(
                                        "invalid extension channel offset\n");
                                break;
                        }
                }
        } else {
                rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
        }

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

        D_ASSOC("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 il_set_rxon_ht(struct il_priv *il, struct il_ht_config *ht_conf)
{
        _il_set_rxon_ht(il, ht_conf, &il->ctx);
}
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->ctx.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);

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

        if (le16_to_cpu(ctx->staging.channel) == channel && il->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;

        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,
                            struct il_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 il_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;
        }
}
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,
                                   struct il_rxon_context *ctx)
{
        const struct il_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_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:
                IL_ERR("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(il->hw)->short_preamble)
                ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
        else
                ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
#endif

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

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

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

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

        ctx->staging.ofdm_basic_rates =
            (IL_OFDM_RATES_MASK >> IL_FIRST_OFDM_RATE) & 0xFF;
        ctx->staging.cck_basic_rates =
            (IL_CCK_RATES_MASK >> IL_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;
}
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->ctx.staging.cck_basic_rates =
                    (IL_CCK_BASIC_RATES_MASK >> IL_FIRST_CCK_RATE) & 0xF;

        il->ctx.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)
{
        struct il_rxon_context *ctx = &il->ctx;

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

        if (test_and_clear_bit(S_CHANNEL_SWITCH_PENDING, &il->status))
                ieee80211_chswitch_done(ctx->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_context *ctx = &il->ctx;
        struct il_rxon_cmd *rxon = (void *)&ctx->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;
                ctx->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_context *ctx)
{
        struct il_rxon_cmd *rxon = &ctx->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
/**
 * il_irq_handle_error - called for HW or SW error interrupt from card
 */
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->cfg->ops->lib->dump_nic_error_log(il);
        if (il->cfg->ops->lib->dump_fh)
                il->cfg->ops->lib->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,
                                        &il->ctx);
#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)
                IL_WARN("Master Disable Timed Out, 100 usec\n");

        D_INFO("stop master\n");

        return ret;
}

void il_apm_stop(struct il_priv *il)
{
        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);


/*
 * 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->base_params->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->base_params->pll_cfg_val)
                il_set_bit(il, CSR_ANA_PLL_CFG,
                            il->cfg->base_params->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->base_params->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;
        struct il_rxon_context *ctx = &il->ctx;

        lockdep_assert_held(&il->mutex);

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

        if (!il->cfg->ops->lib->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(&ctx->active, &ctx->staging, sizeof(ctx->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->cfg->ops->lib->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->ctx.qos_data.def_qos_parm.ac[q].cw_min =
                        cpu_to_le16(params->cw_min);
        il->ctx.qos_data.def_qos_parm.ac[q].cw_max =
                        cpu_to_le16(params->cw_max);
        il->ctx.qos_data.def_qos_parm.ac[q].aifsn = params->aifs;
        il->ctx.qos_data.def_qos_parm.ac[q].edca_txop =
                                cpu_to_le16((params->txop * 32));

        il->ctx.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;

        return il->ibss_manager == IL_IBSS_MANAGER;
}
EXPORT_SYMBOL_GPL(il_mac_tx_last_beacon);

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

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

        return il_commit_rxon(il, ctx);
}

static int il_setup_interface(struct il_priv *il,
                               struct il_rxon_context *ctx)
{
        struct ieee80211_vif *vif = ctx->vif;
        int err;

        lockdep_assert_held(&il->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.
         */
        il->iw_mode = vif->type;

        ctx->is_active = true;

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

        return 0;
}

int
il_mac_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
        struct il_priv *il = hw->priv;
        struct il_vif_priv *vif_priv = (void *)vif->drv_priv;
        int err;
        u32 modes;

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

        mutex_lock(&il->mutex);

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


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

        modes = il->ctx.interface_modes | il->ctx.exclusive_interface_modes;
        if (!(modes & BIT(vif->type))) {
                err = -EOPNOTSUPP;
                goto out;
        }

        vif_priv->ctx = &il->ctx;
        il->ctx.vif = vif;

        err = il_setup_interface(il, &il->ctx);
        if (err) {
                il->ctx.vif = NULL;
                il->iw_mode = NL80211_IFTYPE_STATION;
        }

 out:
        mutex_unlock(&il->mutex);

        D_MAC80211("leave\n");
        return err;
}
EXPORT_SYMBOL(il_mac_add_interface);

static void il_teardown_interface(struct il_priv *il,
                                   struct ieee80211_vif *vif,
                                   bool mode_change)
{
        struct il_rxon_context *ctx = il_rxon_ctx_from_vif(vif);

        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, ctx);
                if (!ctx->always_active)
                        ctx->is_active = false;
        }
}

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

        D_MAC80211("enter\n");

        mutex_lock(&il->mutex);

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

        il_teardown_interface(il, vif, false);

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

        D_MAC80211("leave\n");

}
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->base_params->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_txq_mem(struct il_priv *il)
{
        kfree(il->txq);
        il->txq = NULL;
}
EXPORT_SYMBOL(il_txq_mem);

#ifdef CONFIG_IWLEGACY_DEBUGFS

#define IL_TRAFFIC_DUMP_SIZE    (IL_TRAFFIC_ENTRY_SIZE * IL_TRAFFIC_ENTRIES)

void il_reset_traffic_log(struct il_priv *il)
{
        il->tx_traffic_idx = 0;
        il->rx_traffic_idx = 0;
        if (il->tx_traffic)
                memset(il->tx_traffic, 0, IL_TRAFFIC_DUMP_SIZE);
        if (il->rx_traffic)
                memset(il->rx_traffic, 0, IL_TRAFFIC_DUMP_SIZE);
}

int il_alloc_traffic_mem(struct il_priv *il)
{
        u32 traffic_size = IL_TRAFFIC_DUMP_SIZE;

        if (il_debug_level & IL_DL_TX) {
                if (!il->tx_traffic) {
                        il->tx_traffic =
                                kzalloc(traffic_size, GFP_KERNEL);
                        if (!il->tx_traffic)
                                return -ENOMEM;
                }
        }
        if (il_debug_level & IL_DL_RX) {
                if (!il->rx_traffic) {
                        il->rx_traffic =
                                kzalloc(traffic_size, GFP_KERNEL);
                        if (!il->rx_traffic)
                                return -ENOMEM;
                }
        }
        il_reset_traffic_log(il);
        return 0;
}
EXPORT_SYMBOL(il_alloc_traffic_mem);

void il_free_traffic_mem(struct il_priv *il)
{
        kfree(il->tx_traffic);
        il->tx_traffic = NULL;

        kfree(il->rx_traffic);
        il->rx_traffic = NULL;
}
EXPORT_SYMBOL(il_free_traffic_mem);

void il_dbg_log_tx_data_frame(struct il_priv *il,
                      u16 length, struct ieee80211_hdr *header)
{
        __le16 fc;
        u16 len;

        if (likely(!(il_debug_level & IL_DL_TX)))
                return;

        if (!il->tx_traffic)
                return;

        fc = header->frame_control;
        if (ieee80211_is_data(fc)) {
                len = (length > IL_TRAFFIC_ENTRY_SIZE)
                       ? IL_TRAFFIC_ENTRY_SIZE : length;
                memcpy((il->tx_traffic +
                       (il->tx_traffic_idx * IL_TRAFFIC_ENTRY_SIZE)),
                       header, len);
                il->tx_traffic_idx =
                        (il->tx_traffic_idx + 1) % IL_TRAFFIC_ENTRIES;
        }
}
EXPORT_SYMBOL(il_dbg_log_tx_data_frame);

void il_dbg_log_rx_data_frame(struct il_priv *il,
                      u16 length, struct ieee80211_hdr *header)
{
        __le16 fc;
        u16 len;

        if (likely(!(il_debug_level & IL_DL_RX)))
                return;

        if (!il->rx_traffic)
                return;

        fc = header->frame_control;
        if (ieee80211_is_data(fc)) {
                len = (length > IL_TRAFFIC_ENTRY_SIZE)
                       ? IL_TRAFFIC_ENTRY_SIZE : length;
                memcpy((il->rx_traffic +
                       (il->rx_traffic_idx * IL_TRAFFIC_ENTRY_SIZE)),
                       header, len);
                il->rx_traffic_idx =
                        (il->rx_traffic_idx + 1) % IL_TRAFFIC_ENTRIES;
        }
}
EXPORT_SYMBOL(il_dbg_log_rx_data_frame);

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

        }
}

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

        }
}

void il_clear_traffic_stats(struct il_priv *il)
{
        memset(&il->tx_stats, 0, sizeof(struct traffic_stats));
        memset(&il->rx_stats, 0, sizeof(struct traffic_stats));
}

/*
 * if CONFIG_IWLEGACY_DEBUGFS defined,
 * il_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_stats
 * if CONFIG_IWLEGACY_DEBUGFS not being defined, then no MGMT and CTRL
 * information will be recorded, but DATA pkt still will be recorded
 * for the reason of il_led.c need to control the led blinking based on
 * number of tx and rx data.
 *
 */
void
il_update_stats(struct il_priv *il, bool is_tx, __le16 fc, u16 len)
{
        struct traffic_stats    *stats;

        if (is_tx)
                stats = &il->tx_stats;
        else
                stats = &il->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;
        }
}
EXPORT_SYMBOL(il_update_stats);
#endif

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;
        struct il_rxon_context *ctx = il_rxon_ctx_from_vif(vif);
        u32 modes;
        int err;

        newtype = ieee80211_iftype_p2p(newtype, newp2p);

        mutex_lock(&il->mutex);

        if (!ctx->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;
        }

        modes = ctx->interface_modes | ctx->exclusive_interface_modes;
        if (!(modes & BIT(newtype))) {
                err = -EOPNOTSUPP;
                goto out;
        }

        if ((il->ctx.exclusive_interface_modes & BIT(il->ctx.vif->type)) ||
            (il->ctx.exclusive_interface_modes & BIT(newtype))) {
                err = -EINVAL;
                goto out;
        }

        /* success */
        il_teardown_interface(il, vif, true);
        vif->type = newtype;
        vif->p2p = newp2p;
        err = il_setup_interface(il, 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(&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;
        int ret;

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

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

        if (time_after(jiffies, timeout)) {
                IL_ERR("Queue %d stuck for %u ms.\n",
                                q->id, il->cfg->base_params->wd_timeout);
                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->base_params->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 */
        if (il_is_any_associated(il)) {
                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->base_params->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

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;
}
EXPORT_SYMBOL(il_pci_suspend);

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_RF_KILL_HW, &il->status);
        else
                clear_bit(S_RF_KILL_HW, &il->status);

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

        return 0;
}
EXPORT_SYMBOL(il_pci_resume);

const struct dev_pm_ops il_pm_ops = {
        .suspend = il_pci_suspend,
        .resume = il_pci_resume,
        .freeze = il_pci_suspend,
        .thaw = il_pci_resume,
        .poweroff = il_pci_suspend,
        .restore = il_pci_resume,
};
EXPORT_SYMBOL(il_pm_ops);

#endif /* CONFIG_PM */

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

        if (!ctx->is_active)
                return;

        ctx->qos_data.def_qos_parm.qos_flags = 0;

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

        if (ctx->ht.enabled)
                ctx->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",
                      ctx->qos_data.qos_active,
                      ctx->qos_data.def_qos_parm.qos_flags);

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

/**
 * il_mac_config - mac80211 config callback
 */
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;
        struct il_rxon_context *ctx = &il->ctx;
        unsigned long flags = 0;
        int ret = 0;
        u16 ch;
        int scan_active = 0;
        bool ht_changed = false;

        if (WARN_ON(!il->cfg->ops->legacy))
                return -EOPNOTSUPP;

        mutex_lock(&il->mutex);

        D_MAC80211("enter to 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->cfg->ops->hcmd->set_rxon_chain)
                        il->cfg->ops->hcmd->set_rxon_chain(il, &il->ctx);
        }

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

                /*
                 * Default to no protection. Protection mode will
                 * later be set from BSS config in il_ht_conf
                 */
                ctx->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(ctx->staging.channel) != ch))
                        ctx->staging.flags = 0;

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

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

                spin_unlock_irqrestore(&il->lock, flags);

                if (il->cfg->ops->legacy->update_bcast_stations)
                        ret =
                        il->cfg->ops->legacy->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(&ctx->active, &ctx->staging, sizeof(ctx->staging)))
                il_commit_rxon(il, ctx);
        else
                D_INFO("Not re-sending same RXON configuration.\n");
        if (ht_changed)
                il_update_qos(il, ctx);

out:
        D_MAC80211("leave\n");
        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;
        struct il_rxon_context *ctx = &il->ctx;

        if (WARN_ON(!il->cfg->ops->legacy))
                return;

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

        spin_lock_irqsave(&il->lock, flags);
        memset(&il->current_ht_config, 0, sizeof(struct il_ht_config));
        spin_unlock_irqrestore(&il->lock, flags);

        spin_lock_irqsave(&il->lock, flags);

        /* 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
         * clear RXON_FILTER_ASSOC_MSK bit
         */
        ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
        il_commit_rxon(il, ctx);

        il_set_rate(il);

        mutex_unlock(&il->mutex);

        D_MAC80211("leave\n");
}
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;
        struct il_rxon_context *ctx = il_rxon_ctx_from_vif(vif);

        D_ASSOC("enter:\n");

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

        ctx->ht.protection =
                bss_conf->ht_operation_mode & IEEE80211_HT_OP_MODE_PROTECTION;
        ctx->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)
{
        struct il_rxon_context *ctx = il_rxon_ctx_from_vif(vif);

        /*
         * inform the ucode that there is no longer an
         * association and that no more packets should be
         * sent
         */
        ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
        ctx->staging.assoc_id = 0;
        il_commit_rxon(il, ctx);
}

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_ctx) {
                IL_ERR("update beacon but no beacon context!\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->cfg->ops->legacy->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;
        struct il_rxon_context *ctx = il_rxon_ctx_from_vif(vif);
        int ret;

        if (WARN_ON(!il->cfg->ops->legacy))
                return;

        D_MAC80211("changes = 0x%X\n", changes);

        mutex_lock(&il->mutex);

        if (!il_is_alive(il)) {
                mutex_unlock(&il->mutex);
                return;
        }

        if (changes & BSS_CHANGED_QOS) {
                unsigned long flags;

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

        if (changes & BSS_CHANGED_BEACON_ENABLED) {
                /*
                 * the add_interface code must make sure we only ever
                 * have a single interface that could be beaconing at
                 * any time.
                 */
                if (vif->bss_conf.enable_beacon)
                        il->beacon_ctx = ctx;
                else
                        il->beacon_ctx = NULL;
        }

        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 else the RXON
                 * below/in post_associate will fail.
                 */
                if (il_scan_cancel_timeout(il, 100)) {
                        IL_WARN(
                                "Aborted scan still in progress after 100ms\n");
                        D_MAC80211(
                                "leaving - scan abort failed.\n");
                        mutex_unlock(&il->mutex);
                        return;
                }

                /* mac80211 only sets assoc when in STATION mode */
                if (vif->type == NL80211_IFTYPE_ADHOC || bss_conf->assoc) {
                        memcpy(ctx->staging.bssid_addr,
                               bss_conf->bssid, ETH_ALEN);

                        /* currently needed in a few places */
                        memcpy(il->bssid, bss_conf->bssid, ETH_ALEN);
                } else {
                        ctx->staging.filter_flags &=
                                ~RXON_FILTER_ASSOC_MSK;
                }

        }

        /*
         * 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)
                        ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
                else
                        ctx->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)
                        ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
                else
                        ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
                if (bss_conf->use_cts_prot)
                        ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
                else
                        ctx->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)
                        ctx->staging.ofdm_basic_rates =
                                bss_conf->basic_rates;
                else
                        ctx->staging.ofdm_basic_rates =
                                bss_conf->basic_rates >> 4;
                        ctx->staging.cck_basic_rates =
                                bss_conf->basic_rates & 0xF;
                 */
        }

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

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

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

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

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

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

        if (changes & BSS_CHANGED_IBSS) {
                ret = il->cfg->ops->legacy->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);
        }

        mutex_unlock(&il->mutex);

        D_MAC80211("leave\n");
}
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);