/*
 * Intel Wireless Multicomm 3200 WiFi driver
 *
 * Copyright (C) 2009 Intel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * Intel Corporation <ilw@linux.intel.com>
 * Samuel Ortiz <samuel.ortiz@intel.com>
 * Zhu Yi <yi.zhu@intel.com>
 *
 */

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/sched.h>
#include <linux/ieee80211.h>
#include <linux/wireless.h>

#include "iwm.h"
#include "debug.h"
#include "bus.h"
#include "umac.h"
#include "commands.h"
#include "hal.h"
#include "fw.h"
#include "rx.h"

static struct iwm_conf def_iwm_conf = {

        .sdio_ior_timeout       = 5000,
        .calib_map              = BIT(CALIB_CFG_DC_IDX) |
                                  BIT(CALIB_CFG_LO_IDX) |
                                  BIT(CALIB_CFG_TX_IQ_IDX)      |
                                  BIT(CALIB_CFG_RX_IQ_IDX)      |
                                  BIT(SHILOH_PHY_CALIBRATE_BASE_BAND_CMD),
        .expected_calib_map     = BIT(PHY_CALIBRATE_DC_CMD)     |
                                  BIT(PHY_CALIBRATE_LO_CMD)     |
                                  BIT(PHY_CALIBRATE_TX_IQ_CMD)  |
                                  BIT(PHY_CALIBRATE_RX_IQ_CMD)  |
                                  BIT(SHILOH_PHY_CALIBRATE_BASE_BAND_CMD),
        .reset_on_fatal_err     = 1,
        .auto_connect           = 1,
        .wimax_not_present      = 0,
        .enable_qos             = 1,
        .mode                   = UMAC_MODE_BSS,

        /* UMAC configuration */
        .power_index            = 0,
        .frag_threshold         = IEEE80211_MAX_FRAG_THRESHOLD,
        .rts_threshold          = IEEE80211_MAX_RTS_THRESHOLD,
        .cts_to_self            = 0,

        .assoc_timeout          = 2,
        .roam_timeout           = 10,
        .wireless_mode          = WIRELESS_MODE_11A | WIRELESS_MODE_11G,
        .coexist_mode           = COEX_MODE_CM,

        /* IBSS */
        .ibss_band              = UMAC_BAND_2GHZ,
        .ibss_channel           = 1,

        .mac_addr               = {0x00, 0x02, 0xb3, 0x01, 0x02, 0x03},
};

static int modparam_reset;
module_param_named(reset, modparam_reset, bool, 0644);
MODULE_PARM_DESC(reset, "reset on firmware errors (default 0 [not reset])");

int iwm_mode_to_nl80211_iftype(int mode)
{
        switch (mode) {
        case UMAC_MODE_BSS:
                return NL80211_IFTYPE_STATION;
        case UMAC_MODE_IBSS:
                return NL80211_IFTYPE_ADHOC;
        default:
                return NL80211_IFTYPE_UNSPECIFIED;
        }

        return 0;
}

static void iwm_statistics_request(struct work_struct *work)
{
        struct iwm_priv *iwm =
                container_of(work, struct iwm_priv, stats_request.work);

        iwm_send_umac_stats_req(iwm, 0);
}

static void iwm_disconnect_work(struct work_struct *work)
{
        struct iwm_priv *iwm =
                container_of(work, struct iwm_priv, disconnect.work);

        if (iwm->umac_profile_active)
                iwm_invalidate_mlme_profile(iwm);

        clear_bit(IWM_STATUS_ASSOCIATED, &iwm->status);
        iwm->umac_profile_active = 0;
        memset(iwm->bssid, 0, ETH_ALEN);
        iwm->channel = 0;

        iwm_link_off(iwm);

        wake_up_interruptible(&iwm->mlme_queue);

        cfg80211_disconnected(iwm_to_ndev(iwm), 0, NULL, 0, GFP_KERNEL);
}

static int __iwm_up(struct iwm_priv *iwm);
static int __iwm_down(struct iwm_priv *iwm);

static void iwm_reset_worker(struct work_struct *work)
{
        struct iwm_priv *iwm;
        struct iwm_umac_profile *profile = NULL;
        int uninitialized_var(ret), retry = 0;

        iwm = container_of(work, struct iwm_priv, reset_worker);

        /*
         * XXX: The iwm->mutex is introduced purely for this reset work,
         * because the other users for iwm_up and iwm_down are only netdev
         * ndo_open and ndo_stop which are already protected by rtnl.
         * Please remove iwm->mutex together if iwm_reset_worker() is not
         * required in the future.
         */
        if (!mutex_trylock(&iwm->mutex)) {
                IWM_WARN(iwm, "We are in the middle of interface bringing "
                         "UP/DOWN. Skip driver resetting.\n");
                return;
        }

        if (iwm->umac_profile_active) {
                profile = kmalloc(sizeof(struct iwm_umac_profile), GFP_KERNEL);
                if (profile)
                        memcpy(profile, iwm->umac_profile, sizeof(*profile));
                else
                        IWM_ERR(iwm, "Couldn't alloc memory for profile\n");
        }

        __iwm_down(iwm);

        while (retry++ < 3) {
                ret = __iwm_up(iwm);
                if (!ret)
                        break;

                schedule_timeout_uninterruptible(10 * HZ);
        }

        if (ret) {
                IWM_WARN(iwm, "iwm_up() failed: %d\n", ret);

                kfree(profile);
                goto out;
        }

        if (profile) {
                IWM_DBG_MLME(iwm, DBG, "Resend UMAC profile\n");
                memcpy(iwm->umac_profile, profile, sizeof(*profile));
                iwm_send_mlme_profile(iwm);
                kfree(profile);
        } else
                clear_bit(IWM_STATUS_RESETTING, &iwm->status);

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

static void iwm_watchdog(unsigned long data)
{
        struct iwm_priv *iwm = (struct iwm_priv *)data;

        IWM_WARN(iwm, "Watchdog expired: UMAC stalls!\n");

        if (modparam_reset)
                iwm_resetting(iwm);
}

int iwm_priv_init(struct iwm_priv *iwm)
{
        int i;
        char name[32];

        iwm->status = 0;
        INIT_LIST_HEAD(&iwm->pending_notif);
        init_waitqueue_head(&iwm->notif_queue);
        init_waitqueue_head(&iwm->nonwifi_queue);
        init_waitqueue_head(&iwm->wifi_ntfy_queue);
        init_waitqueue_head(&iwm->mlme_queue);
        memcpy(&iwm->conf, &def_iwm_conf, sizeof(struct iwm_conf));
        spin_lock_init(&iwm->tx_credit.lock);
        INIT_LIST_HEAD(&iwm->wifi_pending_cmd);
        INIT_LIST_HEAD(&iwm->nonwifi_pending_cmd);
        iwm->wifi_seq_num = UMAC_WIFI_SEQ_NUM_BASE;
        iwm->nonwifi_seq_num = UMAC_NONWIFI_SEQ_NUM_BASE;
        spin_lock_init(&iwm->cmd_lock);
        iwm->scan_id = 1;
        INIT_DELAYED_WORK(&iwm->stats_request, iwm_statistics_request);
        INIT_DELAYED_WORK(&iwm->disconnect, iwm_disconnect_work);
        INIT_WORK(&iwm->reset_worker, iwm_reset_worker);
        INIT_LIST_HEAD(&iwm->bss_list);

        skb_queue_head_init(&iwm->rx_list);
        INIT_LIST_HEAD(&iwm->rx_tickets);
        for (i = 0; i < IWM_RX_ID_HASH; i++)
                INIT_LIST_HEAD(&iwm->rx_packets[i]);

        INIT_WORK(&iwm->rx_worker, iwm_rx_worker);

        iwm->rx_wq = create_singlethread_workqueue(KBUILD_MODNAME "_rx");
        if (!iwm->rx_wq)
                return -EAGAIN;

        for (i = 0; i < IWM_TX_QUEUES; i++) {
                INIT_WORK(&iwm->txq[i].worker, iwm_tx_worker);
                snprintf(name, 32, KBUILD_MODNAME "_tx_%d", i);
                iwm->txq[i].id = i;
                iwm->txq[i].wq = create_singlethread_workqueue(name);
                if (!iwm->txq[i].wq)
                        return -EAGAIN;

                skb_queue_head_init(&iwm->txq[i].queue);
        }

        for (i = 0; i < IWM_NUM_KEYS; i++)
                memset(&iwm->keys[i], 0, sizeof(struct iwm_key));

        iwm->default_key = -1;

        init_timer(&iwm->watchdog);
        iwm->watchdog.function = iwm_watchdog;
        iwm->watchdog.data = (unsigned long)iwm;
        mutex_init(&iwm->mutex);

        iwm->last_fw_err = kzalloc(sizeof(struct iwm_fw_error_hdr),
                                   GFP_KERNEL);
        if (iwm->last_fw_err == NULL)
                return -ENOMEM;

        return 0;
}

void iwm_priv_deinit(struct iwm_priv *iwm)
{
        int i;

        for (i = 0; i < IWM_TX_QUEUES; i++)
                destroy_workqueue(iwm->txq[i].wq);

        destroy_workqueue(iwm->rx_wq);
        kfree(iwm->last_fw_err);
}

/*
 * We reset all the structures, and we reset the UMAC.
 * After calling this routine, you're expected to reload
 * the firmware.
 */
void iwm_reset(struct iwm_priv *iwm)
{
        struct iwm_notif *notif, *next;

        if (test_bit(IWM_STATUS_READY, &iwm->status))
                iwm_target_reset(iwm);

        if (test_bit(IWM_STATUS_RESETTING, &iwm->status)) {
                iwm->status = 0;
                set_bit(IWM_STATUS_RESETTING, &iwm->status);
        } else
                iwm->status = 0;
        iwm->scan_id = 1;

        list_for_each_entry_safe(notif, next, &iwm->pending_notif, pending) {
                list_del(&notif->pending);
                kfree(notif->buf);
                kfree(notif);
        }

        iwm_cmd_flush(iwm);

        flush_workqueue(iwm->rx_wq);

        iwm_link_off(iwm);
}

void iwm_resetting(struct iwm_priv *iwm)
{
        set_bit(IWM_STATUS_RESETTING, &iwm->status);

        schedule_work(&iwm->reset_worker);
}

/*
 * Notification code:
 *
 * We're faced with the following issue: Any host command can
 * have an answer or not, and if there's an answer to expect,
 * it can be treated synchronously or asynchronously.
 * To work around the synchronous answer case, we implemented
 * our notification mechanism.
 * When a code path needs to wait for a command response
 * synchronously, it calls notif_handle(), which waits for the
 * right notification to show up, and then process it. Before
 * starting to wait, it registered as a waiter for this specific
 * answer (by toggling a bit in on of the handler_map), so that
 * the rx code knows that it needs to send a notification to the
 * waiting processes. It does so by calling iwm_notif_send(),
 * which adds the notification to the pending notifications list,
 * and then wakes the waiting processes up.
 */
int iwm_notif_send(struct iwm_priv *iwm, struct iwm_wifi_cmd *cmd,
                   u8 cmd_id, u8 source, u8 *buf, unsigned long buf_size)
{
        struct iwm_notif *notif;

        notif = kzalloc(sizeof(struct iwm_notif), GFP_KERNEL);
        if (!notif) {
                IWM_ERR(iwm, "Couldn't alloc memory for notification\n");
                return -ENOMEM;
        }

        INIT_LIST_HEAD(&notif->pending);
        notif->cmd = cmd;
        notif->cmd_id = cmd_id;
        notif->src = source;
        notif->buf = kzalloc(buf_size, GFP_KERNEL);
        if (!notif->buf) {
                IWM_ERR(iwm, "Couldn't alloc notification buffer\n");
                kfree(notif);
                return -ENOMEM;
        }
        notif->buf_size = buf_size;
        memcpy(notif->buf, buf, buf_size);
        list_add_tail(&notif->pending, &iwm->pending_notif);

        wake_up_interruptible(&iwm->notif_queue);

        return 0;
}

static struct iwm_notif *iwm_notif_find(struct iwm_priv *iwm, u32 cmd,
                                        u8 source)
{
        struct iwm_notif *notif, *next;

        list_for_each_entry_safe(notif, next, &iwm->pending_notif, pending) {
                if ((notif->cmd_id == cmd) && (notif->src == source)) {
                        list_del(&notif->pending);
                        return notif;
                }
        }

        return NULL;
}

static struct iwm_notif *iwm_notif_wait(struct iwm_priv *iwm, u32 cmd,
                                        u8 source, long timeout)
{
        int ret;
        struct iwm_notif *notif;
        unsigned long *map = NULL;

        switch (source) {
        case IWM_SRC_LMAC:
                map = &iwm->lmac_handler_map[0];
                break;
        case IWM_SRC_UMAC:
                map = &iwm->umac_handler_map[0];
                break;
        case IWM_SRC_UDMA:
                map = &iwm->udma_handler_map[0];
                break;
        }

        set_bit(cmd, map);

        ret = wait_event_interruptible_timeout(iwm->notif_queue,
                         ((notif = iwm_notif_find(iwm, cmd, source)) != NULL),
                                               timeout);
        clear_bit(cmd, map);

        if (!ret)
                return NULL;

        return notif;
}

int iwm_notif_handle(struct iwm_priv *iwm, u32 cmd, u8 source, long timeout)
{
        int ret;
        struct iwm_notif *notif;

        notif = iwm_notif_wait(iwm, cmd, source, timeout);
        if (!notif)
                return -ETIME;

        ret = iwm_rx_handle_resp(iwm, notif->buf, notif->buf_size, notif->cmd);
        kfree(notif->buf);
        kfree(notif);

        return ret;
}

static int iwm_config_boot_params(struct iwm_priv *iwm)
{
        struct iwm_udma_nonwifi_cmd target_cmd;
        int ret;

        /* check Wimax is off and config debug monitor */
        if (iwm->conf.wimax_not_present) {
                u32 data1 = 0x1f;
                u32 addr1 = 0x606BE258;

                u32 data2_set = 0x0;
                u32 data2_clr = 0x1;
                u32 addr2 = 0x606BE100;

                u32 data3 = 0x1;
                u32 addr3 = 0x606BEC00;

                target_cmd.resp = 0;
                target_cmd.handle_by_hw = 0;
                target_cmd.eop = 1;

                target_cmd.opcode = UMAC_HDI_OUT_OPCODE_WRITE;
                target_cmd.addr = cpu_to_le32(addr1);
                target_cmd.op1_sz = cpu_to_le32(sizeof(u32));
                target_cmd.op2 = 0;

                ret = iwm_hal_send_target_cmd(iwm, &target_cmd, &data1);
                if (ret < 0) {
                        IWM_ERR(iwm, "iwm_hal_send_target_cmd failed\n");
                        return ret;
                }

                target_cmd.opcode = UMAC_HDI_OUT_OPCODE_READ_MODIFY_WRITE;
                target_cmd.addr = cpu_to_le32(addr2);
                target_cmd.op1_sz = cpu_to_le32(data2_set);
                target_cmd.op2 = cpu_to_le32(data2_clr);

                ret = iwm_hal_send_target_cmd(iwm, &target_cmd, &data1);
                if (ret < 0) {
                        IWM_ERR(iwm, "iwm_hal_send_target_cmd failed\n");
                        return ret;
                }

                target_cmd.opcode = UMAC_HDI_OUT_OPCODE_WRITE;
                target_cmd.addr = cpu_to_le32(addr3);
                target_cmd.op1_sz = cpu_to_le32(sizeof(u32));
                target_cmd.op2 = 0;

                ret = iwm_hal_send_target_cmd(iwm, &target_cmd, &data3);
                if (ret < 0) {
                        IWM_ERR(iwm, "iwm_hal_send_target_cmd failed\n");
                        return ret;
                }
        }

        return 0;
}

void iwm_init_default_profile(struct iwm_priv *iwm,
                              struct iwm_umac_profile *profile)
{
        memset(profile, 0, sizeof(struct iwm_umac_profile));

        profile->sec.auth_type = UMAC_AUTH_TYPE_OPEN;
        profile->sec.flags = UMAC_SEC_FLG_LEGACY_PROFILE;
        profile->sec.ucast_cipher = UMAC_CIPHER_TYPE_NONE;
        profile->sec.mcast_cipher = UMAC_CIPHER_TYPE_NONE;

        if (iwm->conf.enable_qos)
                profile->flags |= cpu_to_le16(UMAC_PROFILE_QOS_ALLOWED);

        profile->wireless_mode = iwm->conf.wireless_mode;
        profile->mode = cpu_to_le32(iwm->conf.mode);

        profile->ibss.atim = 0;
        profile->ibss.beacon_interval = 100;
        profile->ibss.join_only = 0;
        profile->ibss.band = iwm->conf.ibss_band;
        profile->ibss.channel = iwm->conf.ibss_channel;
}

void iwm_link_on(struct iwm_priv *iwm)
{
        netif_carrier_on(iwm_to_ndev(iwm));
        netif_tx_wake_all_queues(iwm_to_ndev(iwm));

        iwm_send_umac_stats_req(iwm, 0);
}

void iwm_link_off(struct iwm_priv *iwm)
{
        struct iw_statistics *wstats = &iwm->wstats;
        int i;

        netif_tx_stop_all_queues(iwm_to_ndev(iwm));
        netif_carrier_off(iwm_to_ndev(iwm));

        for (i = 0; i < IWM_TX_QUEUES; i++) {
                skb_queue_purge(&iwm->txq[i].queue);

                iwm->txq[i].concat_count = 0;
                iwm->txq[i].concat_ptr = iwm->txq[i].concat_buf;

                flush_workqueue(iwm->txq[i].wq);
        }

        iwm_rx_free(iwm);

        cancel_delayed_work_sync(&iwm->stats_request);
        memset(wstats, 0, sizeof(struct iw_statistics));
        wstats->qual.updated = IW_QUAL_ALL_INVALID;

        kfree(iwm->req_ie);
        iwm->req_ie = NULL;
        iwm->req_ie_len = 0;
        kfree(iwm->resp_ie);
        iwm->resp_ie = NULL;
        iwm->resp_ie_len = 0;

        del_timer_sync(&iwm->watchdog);
}

static void iwm_bss_list_clean(struct iwm_priv *iwm)
{
        struct iwm_bss_info *bss, *next;

        list_for_each_entry_safe(bss, next, &iwm->bss_list, node) {
                list_del(&bss->node);
                kfree(bss->bss);
                kfree(bss);
        }
}

static int iwm_channels_init(struct iwm_priv *iwm)
{
        int ret;

        ret = iwm_send_umac_channel_list(iwm);
        if (ret) {
                IWM_ERR(iwm, "Send channel list failed\n");
                return ret;
        }

        ret = iwm_notif_handle(iwm, UMAC_CMD_OPCODE_GET_CHAN_INFO_LIST,
                               IWM_SRC_UMAC, WAIT_NOTIF_TIMEOUT);
        if (ret) {
                IWM_ERR(iwm, "Didn't get a channel list notification\n");
                return ret;
        }

        return 0;
}

static int __iwm_up(struct iwm_priv *iwm)
{
        int ret;
        struct iwm_notif *notif_reboot, *notif_ack = NULL;

        ret = iwm_bus_enable(iwm);
        if (ret) {
                IWM_ERR(iwm, "Couldn't enable function\n");
                return ret;
        }

        iwm_rx_setup_handlers(iwm);

        /* Wait for initial BARKER_REBOOT from hardware */
        notif_reboot = iwm_notif_wait(iwm, IWM_BARKER_REBOOT_NOTIFICATION,
                                      IWM_SRC_UDMA, 2 * HZ);
        if (!notif_reboot) {
                IWM_ERR(iwm, "Wait for REBOOT_BARKER timeout\n");
                goto err_disable;
        }

        /* We send the barker back */
        ret = iwm_bus_send_chunk(iwm, notif_reboot->buf, 16);
        if (ret) {
                IWM_ERR(iwm, "REBOOT barker response failed\n");
                kfree(notif_reboot);
                goto err_disable;
        }

        kfree(notif_reboot->buf);
        kfree(notif_reboot);

        /* Wait for ACK_BARKER from hardware */
        notif_ack = iwm_notif_wait(iwm, IWM_ACK_BARKER_NOTIFICATION,
                                   IWM_SRC_UDMA, 2 * HZ);
        if (!notif_ack) {
                IWM_ERR(iwm, "Wait for ACK_BARKER timeout\n");
                goto err_disable;
        }

        kfree(notif_ack->buf);
        kfree(notif_ack);

        /* We start to config static boot parameters */
        ret = iwm_config_boot_params(iwm);
        if (ret) {
                IWM_ERR(iwm, "Config boot parameters failed\n");
                goto err_disable;
        }

        ret = iwm_read_mac(iwm, iwm_to_ndev(iwm)->dev_addr);
        if (ret) {
                IWM_ERR(iwm, "MAC reading failed\n");
                goto err_disable;
        }

        /* We can load the FWs */
        ret = iwm_load_fw(iwm);
        if (ret) {
                IWM_ERR(iwm, "FW loading failed\n");
                goto err_disable;
        }

        /* We configure the UMAC and enable the wifi module */
        ret = iwm_send_umac_config(iwm,
                        cpu_to_le32(UMAC_RST_CTRL_FLG_WIFI_CORE_EN) |
                        cpu_to_le32(UMAC_RST_CTRL_FLG_WIFI_LINK_EN) |
                        cpu_to_le32(UMAC_RST_CTRL_FLG_WIFI_MLME_EN));
        if (ret) {
                IWM_ERR(iwm, "UMAC config failed\n");
                goto err_fw;
        }

        ret = iwm_notif_handle(iwm, UMAC_NOTIFY_OPCODE_WIFI_CORE_STATUS,
                               IWM_SRC_UMAC, WAIT_NOTIF_TIMEOUT);
        if (ret) {
                IWM_ERR(iwm, "Didn't get a wifi core status notification\n");
                goto err_fw;
        }

        if (iwm->core_enabled != (UMAC_NTFY_WIFI_CORE_STATUS_LINK_EN |
                                  UMAC_NTFY_WIFI_CORE_STATUS_MLME_EN)) {
                IWM_DBG_BOOT(iwm, DBG, "Not all cores enabled:0x%x\n",
                             iwm->core_enabled);
                ret = iwm_notif_handle(iwm, UMAC_NOTIFY_OPCODE_WIFI_CORE_STATUS,
                               IWM_SRC_UMAC, WAIT_NOTIF_TIMEOUT);
                if (ret) {
                        IWM_ERR(iwm, "Didn't get a core status notification\n");
                        goto err_fw;
                }

                if (iwm->core_enabled != (UMAC_NTFY_WIFI_CORE_STATUS_LINK_EN |
                                          UMAC_NTFY_WIFI_CORE_STATUS_MLME_EN)) {
                        IWM_ERR(iwm, "Not all cores enabled: 0x%x\n",
                                iwm->core_enabled);
                        goto err_fw;
                } else {
                        IWM_INFO(iwm, "All cores enabled\n");
                }
        }

        ret = iwm_channels_init(iwm);
        if (ret < 0) {
                IWM_ERR(iwm, "Couldn't init channels\n");
                goto err_fw;
        }

        /* Set the READY bit to indicate interface is brought up successfully */
        set_bit(IWM_STATUS_READY, &iwm->status);

        return 0;

 err_fw:
        iwm_eeprom_exit(iwm);

 err_disable:
        ret = iwm_bus_disable(iwm);
        if (ret < 0)
                IWM_ERR(iwm, "Couldn't disable function\n");

        return -EIO;
}

int iwm_up(struct iwm_priv *iwm)
{
        int ret;

        mutex_lock(&iwm->mutex);
        ret = __iwm_up(iwm);
        mutex_unlock(&iwm->mutex);

        return ret;
}

static int __iwm_down(struct iwm_priv *iwm)
{
        int ret;

        /* The interface is already down */
        if (!test_bit(IWM_STATUS_READY, &iwm->status))
                return 0;

        if (iwm->scan_request) {
                cfg80211_scan_done(iwm->scan_request, true);
                iwm->scan_request = NULL;
        }

        clear_bit(IWM_STATUS_READY, &iwm->status);

        iwm_eeprom_exit(iwm);
        iwm_bss_list_clean(iwm);
        iwm_init_default_profile(iwm, iwm->umac_profile);
        iwm->umac_profile_active = false;
        iwm->default_key = -1;
        iwm->core_enabled = 0;

        ret = iwm_bus_disable(iwm);
        if (ret < 0) {
                IWM_ERR(iwm, "Couldn't disable function\n");
                return ret;
        }

        return 0;
}

int iwm_down(struct iwm_priv *iwm)
{
        int ret;

        mutex_lock(&iwm->mutex);
        ret = __iwm_down(iwm);
        mutex_unlock(&iwm->mutex);

        return ret;
}