/******************************************************************************
 *
 * Copyright(c) 2003 - 2010 Intel Corporation. All rights reserved.
 *
 * Portions of this file are derived from the ipw3945 project, as well
 * as portions of the ieee80211 subsystem header files.
 *
 * 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.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci-aspm.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/wireless.h>
#include <linux/firmware.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>

#include <net/mac80211.h>

#include <asm/div64.h>

#define DRV_NAME        "iwlagn"

#include "iwl-eeprom.h"
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-io.h"
#include "iwl-helpers.h"
#include "iwl-sta.h"
#include "iwl-agn-calib.h"
#include "iwl-agn.h"


/******************************************************************************
 *
 * module boiler plate
 *
 ******************************************************************************/

/*
 * module name, copyright, version, etc.
 */
#define DRV_DESCRIPTION "Intel(R) Wireless WiFi Link AGN driver for Linux"

#ifdef CONFIG_IWLWIFI_DEBUG
#define VD "d"
#else
#define VD
#endif

#define DRV_VERSION     IWLWIFI_VERSION VD


MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR(DRV_COPYRIGHT " " DRV_AUTHOR);
MODULE_LICENSE("GPL");
MODULE_ALIAS("iwl4965");

static int iwlagn_ant_coupling;
static bool iwlagn_bt_ch_announce = 1;

void iwl_update_chain_flags(struct iwl_priv *priv)
{
        struct iwl_rxon_context *ctx;

        if (priv->cfg->ops->hcmd->set_rxon_chain) {
                for_each_context(priv, ctx) {
                        priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
                        if (ctx->active.rx_chain != ctx->staging.rx_chain)
                                iwlcore_commit_rxon(priv, ctx);
                }
        }
}

static void iwl_clear_free_frames(struct iwl_priv *priv)
{
        struct list_head *element;

        IWL_DEBUG_INFO(priv, "%d frames on pre-allocated heap on clear.\n",
                       priv->frames_count);

        while (!list_empty(&priv->free_frames)) {
                element = priv->free_frames.next;
                list_del(element);
                kfree(list_entry(element, struct iwl_frame, list));
                priv->frames_count--;
        }

        if (priv->frames_count) {
                IWL_WARN(priv, "%d frames still in use.  Did we lose one?\n",
                            priv->frames_count);
                priv->frames_count = 0;
        }
}

static struct iwl_frame *iwl_get_free_frame(struct iwl_priv *priv)
{
        struct iwl_frame *frame;
        struct list_head *element;
        if (list_empty(&priv->free_frames)) {
                frame = kzalloc(sizeof(*frame), GFP_KERNEL);
                if (!frame) {
                        IWL_ERR(priv, "Could not allocate frame!\n");
                        return NULL;
                }

                priv->frames_count++;
                return frame;
        }

        element = priv->free_frames.next;
        list_del(element);
        return list_entry(element, struct iwl_frame, list);
}

static void iwl_free_frame(struct iwl_priv *priv, struct iwl_frame *frame)
{
        memset(frame, 0, sizeof(*frame));
        list_add(&frame->list, &priv->free_frames);
}

static u32 iwl_fill_beacon_frame(struct iwl_priv *priv,
                                 struct ieee80211_hdr *hdr,
                                 int left)
{
        lockdep_assert_held(&priv->mutex);

        if (!priv->beacon_skb)
                return 0;

        if (priv->beacon_skb->len > left)
                return 0;

        memcpy(hdr, priv->beacon_skb->data, priv->beacon_skb->len);

        return priv->beacon_skb->len;
}

/* Parse the beacon frame to find the TIM element and set tim_idx & tim_size */
static void iwl_set_beacon_tim(struct iwl_priv *priv,
                               struct iwl_tx_beacon_cmd *tx_beacon_cmd,
                               u8 *beacon, u32 frame_size)
{
        u16 tim_idx;
        struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)beacon;

        /*
         * The index is relative to frame start but we start looking at the
         * variable-length part of the beacon.
         */
        tim_idx = mgmt->u.beacon.variable - beacon;

        /* Parse variable-length elements of beacon to find WLAN_EID_TIM */
        while ((tim_idx < (frame_size - 2)) &&
                        (beacon[tim_idx] != WLAN_EID_TIM))
                tim_idx += beacon[tim_idx+1] + 2;

        /* If TIM field was found, set variables */
        if ((tim_idx < (frame_size - 1)) && (beacon[tim_idx] == WLAN_EID_TIM)) {
                tx_beacon_cmd->tim_idx = cpu_to_le16(tim_idx);
                tx_beacon_cmd->tim_size = beacon[tim_idx+1];
        } else
                IWL_WARN(priv, "Unable to find TIM Element in beacon\n");
}

static unsigned int iwl_hw_get_beacon_cmd(struct iwl_priv *priv,
                                       struct iwl_frame *frame)
{
        struct iwl_tx_beacon_cmd *tx_beacon_cmd;
        u32 frame_size;
        u32 rate_flags;
        u32 rate;
        /*
         * We have to set up the TX command, the TX Beacon command, and the
         * beacon contents.
         */

        lockdep_assert_held(&priv->mutex);

        if (!priv->beacon_ctx) {
                IWL_ERR(priv, "trying to build beacon w/o beacon context!\n");
                return 0;
        }

        /* Initialize memory */
        tx_beacon_cmd = &frame->u.beacon;
        memset(tx_beacon_cmd, 0, sizeof(*tx_beacon_cmd));

        /* Set up TX beacon contents */
        frame_size = iwl_fill_beacon_frame(priv, tx_beacon_cmd->frame,
                                sizeof(frame->u) - sizeof(*tx_beacon_cmd));
        if (WARN_ON_ONCE(frame_size > MAX_MPDU_SIZE))
                return 0;
        if (!frame_size)
                return 0;

        /* Set up TX command fields */
        tx_beacon_cmd->tx.len = cpu_to_le16((u16)frame_size);
        tx_beacon_cmd->tx.sta_id = priv->beacon_ctx->bcast_sta_id;
        tx_beacon_cmd->tx.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
        tx_beacon_cmd->tx.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK |
                TX_CMD_FLG_TSF_MSK | TX_CMD_FLG_STA_RATE_MSK;

        /* Set up TX beacon command fields */
        iwl_set_beacon_tim(priv, tx_beacon_cmd, (u8 *)tx_beacon_cmd->frame,
                           frame_size);

        /* Set up packet rate and flags */
        rate = iwl_rate_get_lowest_plcp(priv, priv->beacon_ctx);
        priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
                                              priv->hw_params.valid_tx_ant);
        rate_flags = iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
        if ((rate >= IWL_FIRST_CCK_RATE) && (rate <= IWL_LAST_CCK_RATE))
                rate_flags |= RATE_MCS_CCK_MSK;
        tx_beacon_cmd->tx.rate_n_flags = iwl_hw_set_rate_n_flags(rate,
                        rate_flags);

        return sizeof(*tx_beacon_cmd) + frame_size;
}

int iwlagn_send_beacon_cmd(struct iwl_priv *priv)
{
        struct iwl_frame *frame;
        unsigned int frame_size;
        int rc;

        frame = iwl_get_free_frame(priv);
        if (!frame) {
                IWL_ERR(priv, "Could not obtain free frame buffer for beacon "
                          "command.\n");
                return -ENOMEM;
        }

        frame_size = iwl_hw_get_beacon_cmd(priv, frame);
        if (!frame_size) {
                IWL_ERR(priv, "Error configuring the beacon command\n");
                iwl_free_frame(priv, frame);
                return -EINVAL;
        }

        rc = iwl_send_cmd_pdu(priv, REPLY_TX_BEACON, frame_size,
                              &frame->u.cmd[0]);

        iwl_free_frame(priv, frame);

        return rc;
}

static inline dma_addr_t iwl_tfd_tb_get_addr(struct iwl_tfd *tfd, u8 idx)
{
        struct iwl_tfd_tb *tb = &tfd->tbs[idx];

        dma_addr_t addr = get_unaligned_le32(&tb->lo);
        if (sizeof(dma_addr_t) > sizeof(u32))
                addr |=
                ((dma_addr_t)(le16_to_cpu(tb->hi_n_len) & 0xF) << 16) << 16;

        return addr;
}

static inline u16 iwl_tfd_tb_get_len(struct iwl_tfd *tfd, u8 idx)
{
        struct iwl_tfd_tb *tb = &tfd->tbs[idx];

        return le16_to_cpu(tb->hi_n_len) >> 4;
}

static inline void iwl_tfd_set_tb(struct iwl_tfd *tfd, u8 idx,
                                  dma_addr_t addr, u16 len)
{
        struct iwl_tfd_tb *tb = &tfd->tbs[idx];
        u16 hi_n_len = len << 4;

        put_unaligned_le32(addr, &tb->lo);
        if (sizeof(dma_addr_t) > sizeof(u32))
                hi_n_len |= ((addr >> 16) >> 16) & 0xF;

        tb->hi_n_len = cpu_to_le16(hi_n_len);

        tfd->num_tbs = idx + 1;
}

static inline u8 iwl_tfd_get_num_tbs(struct iwl_tfd *tfd)
{
        return tfd->num_tbs & 0x1f;
}

/**
 * iwl_hw_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
 * @priv - driver private data
 * @txq - tx queue
 *
 * Does NOT advance any TFD circular buffer read/write indexes
 * Does NOT free the TFD itself (which is within circular buffer)
 */
void iwl_hw_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq)
{
        struct iwl_tfd *tfd_tmp = (struct iwl_tfd *)txq->tfds;
        struct iwl_tfd *tfd;
        struct pci_dev *dev = priv->pci_dev;
        int index = txq->q.read_ptr;
        int i;
        int num_tbs;

        tfd = &tfd_tmp[index];

        /* Sanity check on number of chunks */
        num_tbs = iwl_tfd_get_num_tbs(tfd);

        if (num_tbs >= IWL_NUM_OF_TBS) {
                IWL_ERR(priv, "Too many chunks: %i\n", num_tbs);
                /* @todo issue fatal error, it is quite serious situation */
                return;
        }

        /* Unmap tx_cmd */
        if (num_tbs)
                pci_unmap_single(dev,
                                dma_unmap_addr(&txq->meta[index], mapping),
                                dma_unmap_len(&txq->meta[index], len),
                                PCI_DMA_BIDIRECTIONAL);

        /* Unmap chunks, if any. */
        for (i = 1; i < num_tbs; i++)
                pci_unmap_single(dev, iwl_tfd_tb_get_addr(tfd, i),
                                iwl_tfd_tb_get_len(tfd, i), PCI_DMA_TODEVICE);

        /* free SKB */
        if (txq->txb) {
                struct sk_buff *skb;

                skb = txq->txb[txq->q.read_ptr].skb;

                /* can be called from irqs-disabled context */
                if (skb) {
                        dev_kfree_skb_any(skb);
                        txq->txb[txq->q.read_ptr].skb = NULL;
                }
        }
}

int iwl_hw_txq_attach_buf_to_tfd(struct iwl_priv *priv,
                                 struct iwl_tx_queue *txq,
                                 dma_addr_t addr, u16 len,
                                 u8 reset, u8 pad)
{
        struct iwl_queue *q;
        struct iwl_tfd *tfd, *tfd_tmp;
        u32 num_tbs;

        q = &txq->q;
        tfd_tmp = (struct iwl_tfd *)txq->tfds;
        tfd = &tfd_tmp[q->write_ptr];

        if (reset)
                memset(tfd, 0, sizeof(*tfd));

        num_tbs = iwl_tfd_get_num_tbs(tfd);

        /* Each TFD can point to a maximum 20 Tx buffers */
        if (num_tbs >= IWL_NUM_OF_TBS) {
                IWL_ERR(priv, "Error can not send more than %d chunks\n",
                          IWL_NUM_OF_TBS);
                return -EINVAL;
        }

        BUG_ON(addr & ~DMA_BIT_MASK(36));
        if (unlikely(addr & ~IWL_TX_DMA_MASK))
                IWL_ERR(priv, "Unaligned address = %llx\n",
                          (unsigned long long)addr);

        iwl_tfd_set_tb(tfd, num_tbs, addr, len);

        return 0;
}

/*
 * Tell nic where to find circular buffer of Tx Frame Descriptors for
 * given Tx queue, and enable the DMA channel used for that queue.
 *
 * 4965 supports up to 16 Tx queues in DRAM, mapped to up to 8 Tx DMA
 * channels supported in hardware.
 */
int iwl_hw_tx_queue_init(struct iwl_priv *priv,
                         struct iwl_tx_queue *txq)
{
        int txq_id = txq->q.id;

        /* Circular buffer (TFD queue in DRAM) physical base address */
        iwl_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id),
                             txq->q.dma_addr >> 8);

        return 0;
}

/******************************************************************************
 *
 * Generic RX handler implementations
 *
 ******************************************************************************/
static void iwl_rx_reply_alive(struct iwl_priv *priv,
                                struct iwl_rx_mem_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl_alive_resp *palive;
        struct delayed_work *pwork;

        palive = &pkt->u.alive_frame;

        IWL_DEBUG_INFO(priv, "Alive ucode status 0x%08X revision "
                       "0x%01X 0x%01X\n",
                       palive->is_valid, palive->ver_type,
                       palive->ver_subtype);

        if (palive->ver_subtype == INITIALIZE_SUBTYPE) {
                IWL_DEBUG_INFO(priv, "Initialization Alive received.\n");
                memcpy(&priv->card_alive_init,
                       &pkt->u.alive_frame,
                       sizeof(struct iwl_init_alive_resp));
                pwork = &priv->init_alive_start;
        } else {
                IWL_DEBUG_INFO(priv, "Runtime Alive received.\n");
                memcpy(&priv->card_alive, &pkt->u.alive_frame,
                       sizeof(struct iwl_alive_resp));
                pwork = &priv->alive_start;
        }

        /* We delay the ALIVE response by 5ms to
         * give the HW RF Kill time to activate... */
        if (palive->is_valid == UCODE_VALID_OK)
                queue_delayed_work(priv->workqueue, pwork,
                                   msecs_to_jiffies(5));
        else
                IWL_WARN(priv, "uCode did not respond OK.\n");
}

static void iwl_bg_beacon_update(struct work_struct *work)
{
        struct iwl_priv *priv =
                container_of(work, struct iwl_priv, beacon_update);
        struct sk_buff *beacon;

        mutex_lock(&priv->mutex);
        if (!priv->beacon_ctx) {
                IWL_ERR(priv, "updating beacon w/o beacon context!\n");
                goto out;
        }

        if (priv->beacon_ctx->vif->type != NL80211_IFTYPE_AP) {
                /*
                 * The ucode will send beacon notifications even in
                 * IBSS mode, but we don't want to process them. But
                 * we need to defer the type check to here due to
                 * requiring locking around the beacon_ctx access.
                 */
                goto out;
        }

        /* Pull updated AP beacon from mac80211. will fail if not in AP mode */
        beacon = ieee80211_beacon_get(priv->hw, priv->beacon_ctx->vif);
        if (!beacon) {
                IWL_ERR(priv, "update beacon failed -- keeping old\n");
                goto out;
        }

        /* new beacon skb is allocated every time; dispose previous.*/
        dev_kfree_skb(priv->beacon_skb);

        priv->beacon_skb = beacon;

        iwlagn_send_beacon_cmd(priv);
 out:
        mutex_unlock(&priv->mutex);
}

static void iwl_bg_bt_runtime_config(struct work_struct *work)
{
        struct iwl_priv *priv =
                container_of(work, struct iwl_priv, bt_runtime_config);

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

        /* dont send host command if rf-kill is on */
        if (!iwl_is_ready_rf(priv))
                return;
        priv->cfg->ops->hcmd->send_bt_config(priv);
}

static void iwl_bg_bt_full_concurrency(struct work_struct *work)
{
        struct iwl_priv *priv =
                container_of(work, struct iwl_priv, bt_full_concurrency);
        struct iwl_rxon_context *ctx;

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

        /* dont send host command if rf-kill is on */
        if (!iwl_is_ready_rf(priv))
                return;

        IWL_DEBUG_INFO(priv, "BT coex in %s mode\n",
                       priv->bt_full_concurrent ?
                       "full concurrency" : "3-wire");

        /*
         * LQ & RXON updated cmds must be sent before BT Config cmd
         * to avoid 3-wire collisions
         */
        mutex_lock(&priv->mutex);
        for_each_context(priv, ctx) {
                if (priv->cfg->ops->hcmd->set_rxon_chain)
                        priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
                iwlcore_commit_rxon(priv, ctx);
        }
        mutex_unlock(&priv->mutex);

        priv->cfg->ops->hcmd->send_bt_config(priv);
}

/**
 * iwl_bg_statistics_periodic - Timer callback to queue statistics
 *
 * This callback is provided in order to send a statistics request.
 *
 * This timer function is continually reset to execute within
 * REG_RECALIB_PERIOD seconds since the last STATISTICS_NOTIFICATION
 * was received.  We need to ensure we receive the statistics in order
 * to update the temperature used for calibrating the TXPOWER.
 */
static void iwl_bg_statistics_periodic(unsigned long data)
{
        struct iwl_priv *priv = (struct iwl_priv *)data;

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

        /* dont send host command if rf-kill is on */
        if (!iwl_is_ready_rf(priv))
                return;

        iwl_send_statistics_request(priv, CMD_ASYNC, false);
}


static void iwl_print_cont_event_trace(struct iwl_priv *priv, u32 base,
                                        u32 start_idx, u32 num_events,
                                        u32 mode)
{
        u32 i;
        u32 ptr;        /* SRAM byte address of log data */
        u32 ev, time, data; /* event log data */
        unsigned long reg_flags;

        if (mode == 0)
                ptr = base + (4 * sizeof(u32)) + (start_idx * 2 * sizeof(u32));
        else
                ptr = base + (4 * sizeof(u32)) + (start_idx * 3 * sizeof(u32));

        /* Make sure device is powered up for SRAM reads */
        spin_lock_irqsave(&priv->reg_lock, reg_flags);
        if (iwl_grab_nic_access(priv)) {
                spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
                return;
        }

        /* Set starting address; reads will auto-increment */
        _iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR, ptr);
        rmb();

        /*
         * "time" is actually "data" for mode 0 (no timestamp).
         * place event id # at far right for easier visual parsing.
         */
        for (i = 0; i < num_events; i++) {
                ev = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
                time = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
                if (mode == 0) {
                        trace_iwlwifi_dev_ucode_cont_event(priv,
                                                        0, time, ev);
                } else {
                        data = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
                        trace_iwlwifi_dev_ucode_cont_event(priv,
                                                time, data, ev);
                }
        }
        /* Allow device to power down */
        iwl_release_nic_access(priv);
        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
}

static void iwl_continuous_event_trace(struct iwl_priv *priv)
{
        u32 capacity;   /* event log capacity in # entries */
        u32 base;       /* SRAM byte address of event log header */
        u32 mode;       /* 0 - no timestamp, 1 - timestamp recorded */
        u32 num_wraps;  /* # times uCode wrapped to top of log */
        u32 next_entry; /* index of next entry to be written by uCode */

        if (priv->ucode_type == UCODE_INIT)
                base = le32_to_cpu(priv->card_alive_init.error_event_table_ptr);
        else
                base = le32_to_cpu(priv->card_alive.log_event_table_ptr);
        if (priv->cfg->ops->lib->is_valid_rtc_data_addr(base)) {
                capacity = iwl_read_targ_mem(priv, base);
                num_wraps = iwl_read_targ_mem(priv, base + (2 * sizeof(u32)));
                mode = iwl_read_targ_mem(priv, base + (1 * sizeof(u32)));
                next_entry = iwl_read_targ_mem(priv, base + (3 * sizeof(u32)));
        } else
                return;

        if (num_wraps == priv->event_log.num_wraps) {
                iwl_print_cont_event_trace(priv,
                                       base, priv->event_log.next_entry,
                                       next_entry - priv->event_log.next_entry,
                                       mode);
                priv->event_log.non_wraps_count++;
        } else {
                if ((num_wraps - priv->event_log.num_wraps) > 1)
                        priv->event_log.wraps_more_count++;
                else
                        priv->event_log.wraps_once_count++;
                trace_iwlwifi_dev_ucode_wrap_event(priv,
                                num_wraps - priv->event_log.num_wraps,
                                next_entry, priv->event_log.next_entry);
                if (next_entry < priv->event_log.next_entry) {
                        iwl_print_cont_event_trace(priv, base,
                               priv->event_log.next_entry,
                               capacity - priv->event_log.next_entry,
                               mode);

                        iwl_print_cont_event_trace(priv, base, 0,
                                next_entry, mode);
                } else {
                        iwl_print_cont_event_trace(priv, base,
                               next_entry, capacity - next_entry,
                               mode);

                        iwl_print_cont_event_trace(priv, base, 0,
                                next_entry, mode);
                }
        }
        priv->event_log.num_wraps = num_wraps;
        priv->event_log.next_entry = next_entry;
}

/**
 * iwl_bg_ucode_trace - Timer callback to log ucode event
 *
 * The timer is continually set to execute every
 * UCODE_TRACE_PERIOD milliseconds after the last timer expired
 * this function is to perform continuous uCode event logging operation
 * if enabled
 */
static void iwl_bg_ucode_trace(unsigned long data)
{
        struct iwl_priv *priv = (struct iwl_priv *)data;

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

        if (priv->event_log.ucode_trace) {
                iwl_continuous_event_trace(priv);
                /* Reschedule the timer to occur in UCODE_TRACE_PERIOD */
                mod_timer(&priv->ucode_trace,
                         jiffies + msecs_to_jiffies(UCODE_TRACE_PERIOD));
        }
}

static void iwl_rx_beacon_notif(struct iwl_priv *priv,
                                struct iwl_rx_mem_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl4965_beacon_notif *beacon =
                (struct iwl4965_beacon_notif *)pkt->u.raw;
#ifdef CONFIG_IWLWIFI_DEBUG
        u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);

        IWL_DEBUG_RX(priv, "beacon status %x retries %d iss %d "
                "tsf %d %d rate %d\n",
                le32_to_cpu(beacon->beacon_notify_hdr.u.status) & TX_STATUS_MSK,
                beacon->beacon_notify_hdr.failure_frame,
                le32_to_cpu(beacon->ibss_mgr_status),
                le32_to_cpu(beacon->high_tsf),
                le32_to_cpu(beacon->low_tsf), rate);
#endif

        priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);

        if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
                queue_work(priv->workqueue, &priv->beacon_update);
}

/* Handle notification from uCode that card's power state is changing
 * due to software, hardware, or critical temperature RFKILL */
static void iwl_rx_card_state_notif(struct iwl_priv *priv,
                                    struct iwl_rx_mem_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags);
        unsigned long status = priv->status;

        IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
                          (flags & HW_CARD_DISABLED) ? "Kill" : "On",
                          (flags & SW_CARD_DISABLED) ? "Kill" : "On",
                          (flags & CT_CARD_DISABLED) ?
                          "Reached" : "Not reached");

        if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
                     CT_CARD_DISABLED)) {

                iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
                            CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);

                iwl_write_direct32(priv, HBUS_TARG_MBX_C,
                                        HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);

                if (!(flags & RXON_CARD_DISABLED)) {
                        iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
                                    CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
                        iwl_write_direct32(priv, HBUS_TARG_MBX_C,
                                        HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
                }
                if (flags & CT_CARD_DISABLED)
                        iwl_tt_enter_ct_kill(priv);
        }
        if (!(flags & CT_CARD_DISABLED))
                iwl_tt_exit_ct_kill(priv);

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


        if (!(flags & RXON_CARD_DISABLED))
                iwl_scan_cancel(priv);

        if ((test_bit(STATUS_RF_KILL_HW, &status) !=
             test_bit(STATUS_RF_KILL_HW, &priv->status)))
                wiphy_rfkill_set_hw_state(priv->hw->wiphy,
                        test_bit(STATUS_RF_KILL_HW, &priv->status));
        else
                wake_up_interruptible(&priv->wait_command_queue);
}

static void iwl_bg_tx_flush(struct work_struct *work)
{
        struct iwl_priv *priv =
                container_of(work, struct iwl_priv, tx_flush);

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

        /* do nothing if rf-kill is on */
        if (!iwl_is_ready_rf(priv))
                return;

        if (priv->cfg->ops->lib->txfifo_flush) {
                IWL_DEBUG_INFO(priv, "device request: flush all tx frames\n");
                iwlagn_dev_txfifo_flush(priv, IWL_DROP_ALL);
        }
}

/**
 * iwl_setup_rx_handlers - Initialize Rx handler callbacks
 *
 * Setup the RX handlers for each of the reply types sent from the uCode
 * to the host.
 *
 * This function chains into the hardware specific files for them to setup
 * any hardware specific handlers as well.
 */
static void iwl_setup_rx_handlers(struct iwl_priv *priv)
{
        priv->rx_handlers[REPLY_ALIVE] = iwl_rx_reply_alive;
        priv->rx_handlers[REPLY_ERROR] = iwl_rx_reply_error;
        priv->rx_handlers[CHANNEL_SWITCH_NOTIFICATION] = iwl_rx_csa;
        priv->rx_handlers[SPECTRUM_MEASURE_NOTIFICATION] =
                        iwl_rx_spectrum_measure_notif;
        priv->rx_handlers[PM_SLEEP_NOTIFICATION] = iwl_rx_pm_sleep_notif;
        priv->rx_handlers[PM_DEBUG_STATISTIC_NOTIFIC] =
            iwl_rx_pm_debug_statistics_notif;
        priv->rx_handlers[BEACON_NOTIFICATION] = iwl_rx_beacon_notif;

        /*
         * The same handler is used for both the REPLY to a discrete
         * statistics request from the host as well as for the periodic
         * statistics notifications (after received beacons) from the uCode.
         */
        priv->rx_handlers[REPLY_STATISTICS_CMD] = iwl_reply_statistics;
        priv->rx_handlers[STATISTICS_NOTIFICATION] = iwl_rx_statistics;

        iwl_setup_rx_scan_handlers(priv);

        /* status change handler */
        priv->rx_handlers[CARD_STATE_NOTIFICATION] = iwl_rx_card_state_notif;

        priv->rx_handlers[MISSED_BEACONS_NOTIFICATION] =
            iwl_rx_missed_beacon_notif;
        /* Rx handlers */
        priv->rx_handlers[REPLY_RX_PHY_CMD] = iwlagn_rx_reply_rx_phy;
        priv->rx_handlers[REPLY_RX_MPDU_CMD] = iwlagn_rx_reply_rx;
        /* block ack */
        priv->rx_handlers[REPLY_COMPRESSED_BA] = iwlagn_rx_reply_compressed_ba;
        /* Set up hardware specific Rx handlers */
        priv->cfg->ops->lib->rx_handler_setup(priv);
}

/**
 * iwl_rx_handle - Main entry function for receiving responses from uCode
 *
 * Uses the priv->rx_handlers callback function array to invoke
 * the appropriate handlers, including command responses,
 * frame-received notifications, and other notifications.
 */
void iwl_rx_handle(struct iwl_priv *priv)
{
        struct iwl_rx_mem_buffer *rxb;
        struct iwl_rx_packet *pkt;
        struct iwl_rx_queue *rxq = &priv->rxq;
        u32 r, i;
        int reclaim;
        unsigned long flags;
        u8 fill_rx = 0;
        u32 count = 8;
        int total_empty;

        /* uCode's read index (stored in shared DRAM) indicates the last Rx
         * buffer that the driver may process (last buffer filled by ucode). */
        r = le16_to_cpu(rxq->rb_stts->closed_rb_num) &  0x0FFF;
        i = rxq->read;

        /* Rx interrupt, but nothing sent from uCode */
        if (i == r)
                IWL_DEBUG_RX(priv, "r = %d, i = %d\n", r, i);

        /* calculate total frames need to be restock after handling RX */
        total_empty = r - rxq->write_actual;
        if (total_empty < 0)
                total_empty += RX_QUEUE_SIZE;

        if (total_empty > (RX_QUEUE_SIZE / 2))
                fill_rx = 1;

        while (i != r) {
                int len;

                rxb = rxq->queue[i];

                /* If an RXB doesn't have a Rx queue slot associated with it,
                 * then a bug has been introduced in the queue refilling
                 * routines -- catch it here */
                BUG_ON(rxb == NULL);

                rxq->queue[i] = NULL;

                pci_unmap_page(priv->pci_dev, rxb->page_dma,
                               PAGE_SIZE << priv->hw_params.rx_page_order,
                               PCI_DMA_FROMDEVICE);
                pkt = rxb_addr(rxb);

                len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
                len += sizeof(u32); /* account for status word */
                trace_iwlwifi_dev_rx(priv, pkt, len);

                /* Reclaim a command buffer only if this packet is a response
                 *   to a (driver-originated) command.
                 * If the packet (e.g. Rx frame) originated from uCode,
                 *   there is no command buffer to reclaim.
                 * Ucode should set SEQ_RX_FRAME bit if ucode-originated,
                 *   but apparently a few don't get set; catch them here. */
                reclaim = !(pkt->hdr.sequence & SEQ_RX_FRAME) &&
                        (pkt->hdr.cmd != REPLY_RX_PHY_CMD) &&
                        (pkt->hdr.cmd != REPLY_RX) &&
                        (pkt->hdr.cmd != REPLY_RX_MPDU_CMD) &&
                        (pkt->hdr.cmd != REPLY_COMPRESSED_BA) &&
                        (pkt->hdr.cmd != STATISTICS_NOTIFICATION) &&
                        (pkt->hdr.cmd != REPLY_TX);

                /* Based on type of command response or notification,
                 *   handle those that need handling via function in
                 *   rx_handlers table.  See iwl_setup_rx_handlers() */
                if (priv->rx_handlers[pkt->hdr.cmd]) {
                        IWL_DEBUG_RX(priv, "r = %d, i = %d, %s, 0x%02x\n", r,
                                i, get_cmd_string(pkt->hdr.cmd), pkt->hdr.cmd);
                        priv->isr_stats.rx_handlers[pkt->hdr.cmd]++;
                        priv->rx_handlers[pkt->hdr.cmd] (priv, rxb);
                } else {
                        /* No handling needed */
                        IWL_DEBUG_RX(priv,
                                "r %d i %d No handler needed for %s, 0x%02x\n",
                                r, i, get_cmd_string(pkt->hdr.cmd),
                                pkt->hdr.cmd);
                }

                /*
                 * XXX: After here, we should always check rxb->page
                 * against NULL before touching it or its virtual
                 * memory (pkt). Because some rx_handler might have
                 * already taken or freed the pages.
                 */

                if (reclaim) {
                        /* Invoke any callbacks, transfer the buffer to caller,
                         * and fire off the (possibly) blocking iwl_send_cmd()
                         * as we reclaim the driver command queue */
                        if (rxb->page)
                                iwl_tx_cmd_complete(priv, rxb);
                        else
                                IWL_WARN(priv, "Claim null rxb?\n");
                }

                /* Reuse the page if possible. For notification packets and
                 * SKBs that fail to Rx correctly, add them back into the
                 * rx_free list for reuse later. */
                spin_lock_irqsave(&rxq->lock, flags);
                if (rxb->page != NULL) {
                        rxb->page_dma = pci_map_page(priv->pci_dev, rxb->page,
                                0, PAGE_SIZE << priv->hw_params.rx_page_order,
                                PCI_DMA_FROMDEVICE);
                        list_add_tail(&rxb->list, &rxq->rx_free);
                        rxq->free_count++;
                } else
                        list_add_tail(&rxb->list, &rxq->rx_used);

                spin_unlock_irqrestore(&rxq->lock, flags);

                i = (i + 1) & RX_QUEUE_MASK;
                /* If there are a lot of unused frames,
                 * restock the Rx queue so ucode wont assert. */
                if (fill_rx) {
                        count++;
                        if (count >= 8) {
                                rxq->read = i;
                                iwlagn_rx_replenish_now(priv);
                                count = 0;
                        }
                }
        }

        /* Backtrack one entry */
        rxq->read = i;
        if (fill_rx)
                iwlagn_rx_replenish_now(priv);
        else
                iwlagn_rx_queue_restock(priv);
}

/* call this function to flush any scheduled tasklet */
static inline void iwl_synchronize_irq(struct iwl_priv *priv)
{
        /* wait to make sure we flush pending tasklet*/
        synchronize_irq(priv->pci_dev->irq);
        tasklet_kill(&priv->irq_tasklet);
}

static void iwl_irq_tasklet_legacy(struct iwl_priv *priv)
{
        u32 inta, handled = 0;
        u32 inta_fh;
        unsigned long flags;
        u32 i;
#ifdef CONFIG_IWLWIFI_DEBUG
        u32 inta_mask;
#endif

        spin_lock_irqsave(&priv->lock, flags);

        /* Ack/clear/reset pending uCode interrupts.
         * Note:  Some bits in CSR_INT are "OR" of bits in CSR_FH_INT_STATUS,
         *  and will clear only when CSR_FH_INT_STATUS gets cleared. */
        inta = iwl_read32(priv, CSR_INT);
        iwl_write32(priv, CSR_INT, inta);

        /* Ack/clear/reset pending flow-handler (DMA) interrupts.
         * Any new interrupts that happen after this, either while we're
         * in this tasklet, or later, will show up in next ISR/tasklet. */
        inta_fh = iwl_read32(priv, CSR_FH_INT_STATUS);
        iwl_write32(priv, CSR_FH_INT_STATUS, inta_fh);

#ifdef CONFIG_IWLWIFI_DEBUG
        if (iwl_get_debug_level(priv) & IWL_DL_ISR) {
                /* just for debug */
                inta_mask = iwl_read32(priv, CSR_INT_MASK);
                IWL_DEBUG_ISR(priv, "inta 0x%08x, enabled 0x%08x, fh 0x%08x\n",
                              inta, inta_mask, inta_fh);
        }
#endif

        spin_unlock_irqrestore(&priv->lock, flags);

        /* Since CSR_INT and CSR_FH_INT_STATUS reads and clears are not
         * atomic, make sure that inta covers all the interrupts that
         * we've discovered, even if FH interrupt came in just after
         * reading CSR_INT. */
        if (inta_fh & CSR49_FH_INT_RX_MASK)
                inta |= CSR_INT_BIT_FH_RX;
        if (inta_fh & CSR49_FH_INT_TX_MASK)
                inta |= CSR_INT_BIT_FH_TX;

        /* Now service all interrupt bits discovered above. */
        if (inta & CSR_INT_BIT_HW_ERR) {
                IWL_ERR(priv, "Hardware error detected.  Restarting.\n");

                /* Tell the device to stop sending interrupts */
                iwl_disable_interrupts(priv);

                priv->isr_stats.hw++;
                iwl_irq_handle_error(priv);

                handled |= CSR_INT_BIT_HW_ERR;

                return;
        }

#ifdef CONFIG_IWLWIFI_DEBUG
        if (iwl_get_debug_level(priv) & (IWL_DL_ISR)) {
                /* NIC fires this, but we don't use it, redundant with WAKEUP */
                if (inta & CSR_INT_BIT_SCD) {
                        IWL_DEBUG_ISR(priv, "Scheduler finished to transmit "
                                      "the frame/frames.\n");
                        priv->isr_stats.sch++;
                }

                /* Alive notification via Rx interrupt will do the real work */
                if (inta & CSR_INT_BIT_ALIVE) {
                        IWL_DEBUG_ISR(priv, "Alive interrupt\n");
                        priv->isr_stats.alive++;
                }
        }
#endif
        /* Safely ignore these bits for debug checks below */
        inta &= ~(CSR_INT_BIT_SCD | CSR_INT_BIT_ALIVE);

        /* HW RF KILL switch toggled */
        if (inta & CSR_INT_BIT_RF_KILL) {
                int hw_rf_kill = 0;
                if (!(iwl_read32(priv, CSR_GP_CNTRL) &
                                CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
                        hw_rf_kill = 1;

                IWL_WARN(priv, "RF_KILL bit toggled to %s.\n",
                                hw_rf_kill ? "disable radio" : "enable radio");

                priv->isr_stats.rfkill++;

                /* driver only loads ucode once setting the interface up.
                 * the driver allows loading the ucode even if the radio
                 * is killed. Hence update the killswitch state here. The
                 * rfkill handler will care about restarting if needed.
                 */
                if (!test_bit(STATUS_ALIVE, &priv->status)) {
                        if (hw_rf_kill)
                                set_bit(STATUS_RF_KILL_HW, &priv->status);
                        else
                                clear_bit(STATUS_RF_KILL_HW, &priv->status);
                        wiphy_rfkill_set_hw_state(priv->hw->wiphy, hw_rf_kill);
                }

                handled |= CSR_INT_BIT_RF_KILL;
        }

        /* Chip got too hot and stopped itself */
        if (inta & CSR_INT_BIT_CT_KILL) {
                IWL_ERR(priv, "Microcode CT kill error detected.\n");
                priv->isr_stats.ctkill++;
                handled |= CSR_INT_BIT_CT_KILL;
        }

        /* Error detected by uCode */
        if (inta & CSR_INT_BIT_SW_ERR) {
                IWL_ERR(priv, "Microcode SW error detected. "
                        " Restarting 0x%X.\n", inta);
                priv->isr_stats.sw++;
                iwl_irq_handle_error(priv);
                handled |= CSR_INT_BIT_SW_ERR;
        }

        /*
         * uCode wakes up after power-down sleep.
         * Tell device about any new tx or host commands enqueued,
         * and about any Rx buffers made available while asleep.
         */
        if (inta & CSR_INT_BIT_WAKEUP) {
                IWL_DEBUG_ISR(priv, "Wakeup interrupt\n");
                iwl_rx_queue_update_write_ptr(priv, &priv->rxq);
                for (i = 0; i < priv->hw_params.max_txq_num; i++)
                        iwl_txq_update_write_ptr(priv, &priv->txq[i]);
                priv->isr_stats.wakeup++;
                handled |= CSR_INT_BIT_WAKEUP;
        }

        /* All uCode command responses, including Tx command responses,
         * Rx "responses" (frame-received notification), and other
         * notifications from uCode come through here*/
        if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX)) {
                iwl_rx_handle(priv);
                priv->isr_stats.rx++;
                handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX);
        }

        /* This "Tx" DMA channel is used only for loading uCode */
        if (inta & CSR_INT_BIT_FH_TX) {
                IWL_DEBUG_ISR(priv, "uCode load interrupt\n");
                priv->isr_stats.tx++;
                handled |= CSR_INT_BIT_FH_TX;
                /* Wake up uCode load routine, now that load is complete */
                priv->ucode_write_complete = 1;
                wake_up_interruptible(&priv->wait_command_queue);
        }

        if (inta & ~handled) {
                IWL_ERR(priv, "Unhandled INTA bits 0x%08x\n", inta & ~handled);
                priv->isr_stats.unhandled++;
        }

        if (inta & ~(priv->inta_mask)) {
                IWL_WARN(priv, "Disabled INTA bits 0x%08x were pending\n",
                         inta & ~priv->inta_mask);
                IWL_WARN(priv, "   with FH_INT = 0x%08x\n", inta_fh);
        }

        /* Re-enable all interrupts */
        /* only Re-enable if disabled by irq */
        if (test_bit(STATUS_INT_ENABLED, &priv->status))
                iwl_enable_interrupts(priv);
        /* Re-enable RF_KILL if it occurred */
        else if (handled & CSR_INT_BIT_RF_KILL)
                iwl_enable_rfkill_int(priv);

#ifdef CONFIG_IWLWIFI_DEBUG
        if (iwl_get_debug_level(priv) & (IWL_DL_ISR)) {
                inta = iwl_read32(priv, CSR_INT);
                inta_mask = iwl_read32(priv, CSR_INT_MASK);
                inta_fh = iwl_read32(priv, CSR_FH_INT_STATUS);
                IWL_DEBUG_ISR(priv, "End inta 0x%08x, enabled 0x%08x, fh 0x%08x, "
                        "flags 0x%08lx\n", inta, inta_mask, inta_fh, flags);
        }
#endif
}

/* tasklet for iwlagn interrupt */
static void iwl_irq_tasklet(struct iwl_priv *priv)
{
        u32 inta = 0;
        u32 handled = 0;
        unsigned long flags;
        u32 i;
#ifdef CONFIG_IWLWIFI_DEBUG
        u32 inta_mask;
#endif

        spin_lock_irqsave(&priv->lock, flags);

        /* Ack/clear/reset pending uCode interrupts.
         * Note:  Some bits in CSR_INT are "OR" of bits in CSR_FH_INT_STATUS,
         */
        /* There is a hardware bug in the interrupt mask function that some
         * interrupts (i.e. CSR_INT_BIT_SCD) can still be generated even if
         * they are disabled in the CSR_INT_MASK register. Furthermore the
         * ICT interrupt handling mechanism has another bug that might cause
         * these unmasked interrupts fail to be detected. We workaround the
         * hardware bugs here by ACKing all the possible interrupts so that
         * interrupt coalescing can still be achieved.
         */
        iwl_write32(priv, CSR_INT, priv->_agn.inta | ~priv->inta_mask);

        inta = priv->_agn.inta;

#ifdef CONFIG_IWLWIFI_DEBUG
        if (iwl_get_debug_level(priv) & IWL_DL_ISR) {
                /* just for debug */
                inta_mask = iwl_read32(priv, CSR_INT_MASK);
                IWL_DEBUG_ISR(priv, "inta 0x%08x, enabled 0x%08x\n ",
                                inta, inta_mask);
        }
#endif

        spin_unlock_irqrestore(&priv->lock, flags);

        /* saved interrupt in inta variable now we can reset priv->_agn.inta */
        priv->_agn.inta = 0;

        /* Now service all interrupt bits discovered above. */
        if (inta & CSR_INT_BIT_HW_ERR) {
                IWL_ERR(priv, "Hardware error detected.  Restarting.\n");

                /* Tell the device to stop sending interrupts */
                iwl_disable_interrupts(priv);

                priv->isr_stats.hw++;
                iwl_irq_handle_error(priv);

                handled |= CSR_INT_BIT_HW_ERR;

                return;
        }

#ifdef CONFIG_IWLWIFI_DEBUG
        if (iwl_get_debug_level(priv) & (IWL_DL_ISR)) {
                /* NIC fires this, but we don't use it, redundant with WAKEUP */
                if (inta & CSR_INT_BIT_SCD) {
                        IWL_DEBUG_ISR(priv, "Scheduler finished to transmit "
                                      "the frame/frames.\n");
                        priv->isr_stats.sch++;
                }

                /* Alive notification via Rx interrupt will do the real work */
                if (inta & CSR_INT_BIT_ALIVE) {
                        IWL_DEBUG_ISR(priv, "Alive interrupt\n");
                        priv->isr_stats.alive++;
                }
        }
#endif
        /* Safely ignore these bits for debug checks below */
        inta &= ~(CSR_INT_BIT_SCD | CSR_INT_BIT_ALIVE);

        /* HW RF KILL switch toggled */
        if (inta & CSR_INT_BIT_RF_KILL) {
                int hw_rf_kill = 0;
                if (!(iwl_read32(priv, CSR_GP_CNTRL) &
                                CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
                        hw_rf_kill = 1;

                IWL_WARN(priv, "RF_KILL bit toggled to %s.\n",
                                hw_rf_kill ? "disable radio" : "enable radio");

                priv->isr_stats.rfkill++;

                /* driver only loads ucode once setting the interface up.
                 * the driver allows loading the ucode even if the radio
                 * is killed. Hence update the killswitch state here. The
                 * rfkill handler will care about restarting if needed.
                 */
                if (!test_bit(STATUS_ALIVE, &priv->status)) {
                        if (hw_rf_kill)
                                set_bit(STATUS_RF_KILL_HW, &priv->status);
                        else
                                clear_bit(STATUS_RF_KILL_HW, &priv->status);
                        wiphy_rfkill_set_hw_state(priv->hw->wiphy, hw_rf_kill);
                }

                handled |= CSR_INT_BIT_RF_KILL;
        }

        /* Chip got too hot and stopped itself */
        if (inta & CSR_INT_BIT_CT_KILL) {
                IWL_ERR(priv, "Microcode CT kill error detected.\n");
                priv->isr_stats.ctkill++;
                handled |= CSR_INT_BIT_CT_KILL;
        }

        /* Error detected by uCode */
        if (inta & CSR_INT_BIT_SW_ERR) {
                IWL_ERR(priv, "Microcode SW error detected. "
                        " Restarting 0x%X.\n", inta);
                priv->isr_stats.sw++;
                iwl_irq_handle_error(priv);
                handled |= CSR_INT_BIT_SW_ERR;
        }

        /* uCode wakes up after power-down sleep */
        if (inta & CSR_INT_BIT_WAKEUP) {
                IWL_DEBUG_ISR(priv, "Wakeup interrupt\n");
                iwl_rx_queue_update_write_ptr(priv, &priv->rxq);
                for (i = 0; i < priv->hw_params.max_txq_num; i++)
                        iwl_txq_update_write_ptr(priv, &priv->txq[i]);

                priv->isr_stats.wakeup++;

                handled |= CSR_INT_BIT_WAKEUP;
        }

        /* All uCode command responses, including Tx command responses,
         * Rx "responses" (frame-received notification), and other
         * notifications from uCode come through here*/
        if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX |
                        CSR_INT_BIT_RX_PERIODIC)) {
                IWL_DEBUG_ISR(priv, "Rx interrupt\n");
                if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX)) {
                        handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX);
                        iwl_write32(priv, CSR_FH_INT_STATUS,
                                        CSR49_FH_INT_RX_MASK);
                }
                if (inta & CSR_INT_BIT_RX_PERIODIC) {
                        handled |= CSR_INT_BIT_RX_PERIODIC;
                        iwl_write32(priv, CSR_INT, CSR_INT_BIT_RX_PERIODIC);
                }
                /* Sending RX interrupt require many steps to be done in the
                 * the device:
                 * 1- write interrupt to current index in ICT table.
                 * 2- dma RX frame.
                 * 3- update RX shared data to indicate last write index.
                 * 4- send interrupt.
                 * This could lead to RX race, driver could receive RX interrupt
                 * but the shared data changes does not reflect this;
                 * periodic interrupt will detect any dangling Rx activity.
                 */

                /* Disable periodic interrupt; we use it as just a one-shot. */
                iwl_write8(priv, CSR_INT_PERIODIC_REG,
                            CSR_INT_PERIODIC_DIS);
                iwl_rx_handle(priv);

                /*
                 * Enable periodic interrupt in 8 msec only if we received
                 * real RX interrupt (instead of just periodic int), to catch
                 * any dangling Rx interrupt.  If it was just the periodic
                 * interrupt, there was no dangling Rx activity, and no need
                 * to extend the periodic interrupt; one-shot is enough.
                 */
                if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX))
                        iwl_write8(priv, CSR_INT_PERIODIC_REG,
                                    CSR_INT_PERIODIC_ENA);

                priv->isr_stats.rx++;
        }

        /* This "Tx" DMA channel is used only for loading uCode */
        if (inta & CSR_INT_BIT_FH_TX) {
                iwl_write32(priv, CSR_FH_INT_STATUS, CSR49_FH_INT_TX_MASK);
                IWL_DEBUG_ISR(priv, "uCode load interrupt\n");
                priv->isr_stats.tx++;
                handled |= CSR_INT_BIT_FH_TX;
                /* Wake up uCode load routine, now that load is complete */
                priv->ucode_write_complete = 1;
                wake_up_interruptible(&priv->wait_command_queue);
        }

        if (inta & ~handled) {
                IWL_ERR(priv, "Unhandled INTA bits 0x%08x\n", inta & ~handled);
                priv->isr_stats.unhandled++;
        }

        if (inta & ~(priv->inta_mask)) {
                IWL_WARN(priv, "Disabled INTA bits 0x%08x were pending\n",
                         inta & ~priv->inta_mask);
        }

        /* Re-enable all interrupts */
        /* only Re-enable if disabled by irq */
        if (test_bit(STATUS_INT_ENABLED, &priv->status))
                iwl_enable_interrupts(priv);
        /* Re-enable RF_KILL if it occurred */
        else if (handled & CSR_INT_BIT_RF_KILL)
                iwl_enable_rfkill_int(priv);
}

/* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */
#define ACK_CNT_RATIO (50)
#define BA_TIMEOUT_CNT (5)
#define BA_TIMEOUT_MAX (16)

/**
 * iwl_good_ack_health - checks for ACK count ratios, BA timeout retries.
 *
 * When the ACK count ratio is 0 and aggregated BA timeout retries exceeding
 * the BA_TIMEOUT_MAX, reload firmware and bring system back to normal
 * operation state.
 */
bool iwl_good_ack_health(struct iwl_priv *priv,
                                struct iwl_rx_packet *pkt)
{
        bool rc = true;
        int actual_ack_cnt_delta, expected_ack_cnt_delta;
        int ba_timeout_delta;

        actual_ack_cnt_delta =
                le32_to_cpu(pkt->u.stats.tx.actual_ack_cnt) -
                le32_to_cpu(priv->_agn.statistics.tx.actual_ack_cnt);
        expected_ack_cnt_delta =
                le32_to_cpu(pkt->u.stats.tx.expected_ack_cnt) -
                le32_to_cpu(priv->_agn.statistics.tx.expected_ack_cnt);
        ba_timeout_delta =
                le32_to_cpu(pkt->u.stats.tx.agg.ba_timeout) -
                le32_to_cpu(priv->_agn.statistics.tx.agg.ba_timeout);
        if ((priv->_agn.agg_tids_count > 0) &&
            (expected_ack_cnt_delta > 0) &&
            (((actual_ack_cnt_delta * 100) / expected_ack_cnt_delta)
                < ACK_CNT_RATIO) &&
            (ba_timeout_delta > BA_TIMEOUT_CNT)) {
                IWL_DEBUG_RADIO(priv, "actual_ack_cnt delta = %d,"
                                " expected_ack_cnt = %d\n",
                                actual_ack_cnt_delta, expected_ack_cnt_delta);

#ifdef CONFIG_IWLWIFI_DEBUGFS
                /*
                 * This is ifdef'ed on DEBUGFS because otherwise the
                 * statistics aren't available. If DEBUGFS is set but
                 * DEBUG is not, these will just compile out.
                 */
                IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta = %d\n",
                                priv->_agn.delta_statistics.tx.rx_detected_cnt);
                IWL_DEBUG_RADIO(priv,
                                "ack_or_ba_timeout_collision delta = %d\n",
                                priv->_agn.delta_statistics.tx.
                                ack_or_ba_timeout_collision);
#endif
                IWL_DEBUG_RADIO(priv, "agg ba_timeout delta = %d\n",
                                ba_timeout_delta);
                if (!actual_ack_cnt_delta &&
                    (ba_timeout_delta >= BA_TIMEOUT_MAX))
                        rc = false;
        }
        return rc;
}


/*****************************************************************************
 *
 * sysfs attributes
 *
 *****************************************************************************/

#ifdef CONFIG_IWLWIFI_DEBUG

/*
 * The following adds a new attribute to the sysfs representation
 * of this device driver (i.e. a new file in /sys/class/net/wlan0/device/)
 * used for controlling the debug level.
 *
 * See the level definitions in iwl for details.
 *
 * The debug_level being managed using sysfs below is a per device debug
 * level that is used instead of the global debug level if it (the per
 * device debug level) is set.
 */
static ssize_t show_debug_level(struct device *d,
                                struct device_attribute *attr, char *buf)
{
        struct iwl_priv *priv = dev_get_drvdata(d);
        return sprintf(buf, "0x%08X\n", iwl_get_debug_level(priv));
}
static ssize_t store_debug_level(struct device *d,
                                struct device_attribute *attr,
                                 const char *buf, size_t count)
{
        struct iwl_priv *priv = dev_get_drvdata(d);
        unsigned long val;
        int ret;

        ret = strict_strtoul(buf, 0, &val);
        if (ret)
                IWL_ERR(priv, "%s is not in hex or decimal form.\n", buf);
        else {
                priv->debug_level = val;
                if (iwl_alloc_traffic_mem(priv))
                        IWL_ERR(priv,
                                "Not enough memory to generate traffic log\n");
        }
        return strnlen(buf, count);
}

static DEVICE_ATTR(debug_level, S_IWUSR | S_IRUGO,
                        show_debug_level, store_debug_level);


#endif /* CONFIG_IWLWIFI_DEBUG */


static ssize_t show_temperature(struct device *d,
                                struct device_attribute *attr, char *buf)
{
        struct iwl_priv *priv = dev_get_drvdata(d);

        if (!iwl_is_alive(priv))
                return -EAGAIN;

        return sprintf(buf, "%d\n", priv->temperature);
}

static DEVICE_ATTR(temperature, S_IRUGO, show_temperature, NULL);

static ssize_t show_tx_power(struct device *d,
                             struct device_attribute *attr, char *buf)
{
        struct iwl_priv *priv = dev_get_drvdata(d);

        if (!iwl_is_ready_rf(priv))
                return sprintf(buf, "off\n");
        else
                return sprintf(buf, "%d\n", priv->tx_power_user_lmt);
}

static ssize_t store_tx_power(struct device *d,
                              struct device_attribute *attr,
                              const char *buf, size_t count)
{
        struct iwl_priv *priv = dev_get_drvdata(d);
        unsigned long val;
        int ret;

        ret = strict_strtoul(buf, 10, &val);
        if (ret)
                IWL_INFO(priv, "%s is not in decimal form.\n", buf);
        else {
                ret = iwl_set_tx_power(priv, val, false);
                if (ret)
                        IWL_ERR(priv, "failed setting tx power (0x%d).\n",
                                ret);
                else
                        ret = count;
        }
        return ret;
}

static DEVICE_ATTR(tx_power, S_IWUSR | S_IRUGO, show_tx_power, store_tx_power);

static struct attribute *iwl_sysfs_entries[] = {
        &dev_attr_temperature.attr,
        &dev_attr_tx_power.attr,
#ifdef CONFIG_IWLWIFI_DEBUG
        &dev_attr_debug_level.attr,
#endif
        NULL
};

static struct attribute_group iwl_attribute_group = {
        .name = NULL,           /* put in device directory */
        .attrs = iwl_sysfs_entries,
};

/******************************************************************************
 *
 * uCode download functions
 *
 ******************************************************************************/

static void iwl_dealloc_ucode_pci(struct iwl_priv *priv)
{
        iwl_free_fw_desc(priv->pci_dev, &priv->ucode_code);
        iwl_free_fw_desc(priv->pci_dev, &priv->ucode_data);
        iwl_free_fw_desc(priv->pci_dev, &priv->ucode_data_backup);
        iwl_free_fw_desc(priv->pci_dev, &priv->ucode_init);
        iwl_free_fw_desc(priv->pci_dev, &priv->ucode_init_data);
        iwl_free_fw_desc(priv->pci_dev, &priv->ucode_boot);
}

static void iwl_nic_start(struct iwl_priv *priv)
{
        /* Remove all resets to allow NIC to operate */
        iwl_write32(priv, CSR_RESET, 0);
}

struct iwlagn_ucode_capabilities {
        u32 max_probe_length;
        u32 standard_phy_calibration_size;
        bool pan;
};

static void iwl_ucode_callback(const struct firmware *ucode_raw, void *context);
static int iwl_mac_setup_register(struct iwl_priv *priv,
                                  struct iwlagn_ucode_capabilities *capa);

#define UCODE_EXPERIMENTAL_INDEX        100
#define UCODE_EXPERIMENTAL_TAG          "exp"

static int __must_check iwl_request_firmware(struct iwl_priv *priv, bool first)
{
        const char *name_pre = priv->cfg->fw_name_pre;
        char tag[8];

        if (first) {
#ifdef CONFIG_IWLWIFI_DEBUG_EXPERIMENTAL_UCODE
                priv->fw_index = UCODE_EXPERIMENTAL_INDEX;
                strcpy(tag, UCODE_EXPERIMENTAL_TAG);
        } else if (priv->fw_index == UCODE_EXPERIMENTAL_INDEX) {
#endif
                priv->fw_index = priv->cfg->ucode_api_max;
                sprintf(tag, "%d", priv->fw_index);
        } else {
                priv->fw_index--;
                sprintf(tag, "%d", priv->fw_index);
        }

        if (priv->fw_index < priv->cfg->ucode_api_min) {
                IWL_ERR(priv, "no suitable firmware found!\n");
                return -ENOENT;
        }

        sprintf(priv->firmware_name, "%s%s%s", name_pre, tag, ".ucode");

        IWL_DEBUG_INFO(priv, "attempting to load firmware %s'%s'\n",
                       (priv->fw_index == UCODE_EXPERIMENTAL_INDEX)
                                ? "EXPERIMENTAL " : "",
                       priv->firmware_name);

        return request_firmware_nowait(THIS_MODULE, 1, priv->firmware_name,
                                       &priv->pci_dev->dev, GFP_KERNEL, priv,
                                       iwl_ucode_callback);
}

struct iwlagn_firmware_pieces {
        const void *inst, *data, *init, *init_data, *boot;
        size_t inst_size, data_size, init_size, init_data_size, boot_size;

        u32 build;

        u32 init_evtlog_ptr, init_evtlog_size, init_errlog_ptr;
        u32 inst_evtlog_ptr, inst_evtlog_size, inst_errlog_ptr;
};

static int iwlagn_load_legacy_firmware(struct iwl_priv *priv,
                                       const struct firmware *ucode_raw,
                                       struct iwlagn_firmware_pieces *pieces)
{
        struct iwl_ucode_header *ucode = (void *)ucode_raw->data;
        u32 api_ver, hdr_size;
        const u8 *src;

        priv->ucode_ver = le32_to_cpu(ucode->ver);
        api_ver = IWL_UCODE_API(priv->ucode_ver);

        switch (api_ver) {
        default:
                /*
                 * 4965 doesn't revision the firmware file format
                 * along with the API version, it always uses v1
                 * file format.
                 */
                if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) !=
                                CSR_HW_REV_TYPE_4965) {
                        hdr_size = 28;
                        if (ucode_raw->size < hdr_size) {
                                IWL_ERR(priv, "File size too small!\n");
                                return -EINVAL;
                        }
                        pieces->build = le32_to_cpu(ucode->u.v2.build);
                        pieces->inst_size = le32_to_cpu(ucode->u.v2.inst_size);
                        pieces->data_size = le32_to_cpu(ucode->u.v2.data_size);
                        pieces->init_size = le32_to_cpu(ucode->u.v2.init_size);
                        pieces->init_data_size = le32_to_cpu(ucode->u.v2.init_data_size);
                        pieces->boot_size = le32_to_cpu(ucode->u.v2.boot_size);
                        src = ucode->u.v2.data;
                        break;
                }
                /* fall through for 4965 */
        case 0:
        case 1:
        case 2:
                hdr_size = 24;
                if (ucode_raw->size < hdr_size) {
                        IWL_ERR(priv, "File size too small!\n");
                        return -EINVAL;
                }
                pieces->build = 0;
                pieces->inst_size = le32_to_cpu(ucode->u.v1.inst_size);
                pieces->data_size = le32_to_cpu(ucode->u.v1.data_size);
                pieces->init_size = le32_to_cpu(ucode->u.v1.init_size);
                pieces->init_data_size = le32_to_cpu(ucode->u.v1.init_data_size);
                pieces->boot_size = le32_to_cpu(ucode->u.v1.boot_size);
                src = ucode->u.v1.data;
                break;
        }

        /* Verify size of file vs. image size info in file's header */
        if (ucode_raw->size != hdr_size + pieces->inst_size +
                                pieces->data_size + pieces->init_size +
                                pieces->init_data_size + pieces->boot_size) {

                IWL_ERR(priv,
                        "uCode file size %d does not match expected size\n",
                        (int)ucode_raw->size);
                return -EINVAL;
        }

        pieces->inst = src;
        src += pieces->inst_size;
        pieces->data = src;
        src += pieces->data_size;
        pieces->init = src;
        src += pieces->init_size;
        pieces->init_data = src;
        src += pieces->init_data_size;
        pieces->boot = src;
        src += pieces->boot_size;

        return 0;
}

static int iwlagn_wanted_ucode_alternative = 1;

static int iwlagn_load_firmware(struct iwl_priv *priv,
                                const struct firmware *ucode_raw,
                                struct iwlagn_firmware_pieces *pieces,
                                struct iwlagn_ucode_capabilities *capa)
{
        struct iwl_tlv_ucode_header *ucode = (void *)ucode_raw->data;
        struct iwl_ucode_tlv *tlv;
        size_t len = ucode_raw->size;
        const u8 *data;
        int wanted_alternative = iwlagn_wanted_ucode_alternative, tmp;
        u64 alternatives;
        u32 tlv_len;
        enum iwl_ucode_tlv_type tlv_type;
        const u8 *tlv_data;

        if (len < sizeof(*ucode)) {
                IWL_ERR(priv, "uCode has invalid length: %zd\n", len);
                return -EINVAL;
        }

        if (ucode->magic != cpu_to_le32(IWL_TLV_UCODE_MAGIC)) {
                IWL_ERR(priv, "invalid uCode magic: 0X%x\n",
                        le32_to_cpu(ucode->magic));
                return -EINVAL;
        }

        /*
         * Check which alternatives are present, and "downgrade"
         * when the chosen alternative is not present, warning
         * the user when that happens. Some files may not have
         * any alternatives, so don't warn in that case.
         */
        alternatives = le64_to_cpu(ucode->alternatives);
        tmp = wanted_alternative;
        if (wanted_alternative > 63)
                wanted_alternative = 63;
        while (wanted_alternative && !(alternatives & BIT(wanted_alternative)))
                wanted_alternative--;
        if (wanted_alternative && wanted_alternative != tmp)
                IWL_WARN(priv,
                         "uCode alternative %d not available, choosing %d\n",
                         tmp, wanted_alternative);

        priv->ucode_ver = le32_to_cpu(ucode->ver);
        pieces->build = le32_to_cpu(ucode->build);
        data = ucode->data;

        len -= sizeof(*ucode);

        while (len >= sizeof(*tlv)) {
                u16 tlv_alt;

                len -= sizeof(*tlv);
                tlv = (void *)data;

                tlv_len = le32_to_cpu(tlv->length);
                tlv_type = le16_to_cpu(tlv->type);
                tlv_alt = le16_to_cpu(tlv->alternative);
                tlv_data = tlv->data;

                if (len < tlv_len) {
                        IWL_ERR(priv, "invalid TLV len: %zd/%u\n",
                                len, tlv_len);
                        return -EINVAL;
                }
                len -= ALIGN(tlv_len, 4);
                data += sizeof(*tlv) + ALIGN(tlv_len, 4);

                /*
                 * Alternative 0 is always valid.
                 *
                 * Skip alternative TLVs that are not selected.
                 */
                if (tlv_alt != 0 && tlv_alt != wanted_alternative)
                        continue;

                switch (tlv_type) {
                case IWL_UCODE_TLV_INST:
                        pieces->inst = tlv_data;
                        pieces->inst_size = tlv_len;
                        break;
                case IWL_UCODE_TLV_DATA:
                        pieces->data = tlv_data;
                        pieces->data_size = tlv_len;
                        break;
                case IWL_UCODE_TLV_INIT:
                        pieces->init = tlv_data;
                        pieces->init_size = tlv_len;
                        break;
                case IWL_UCODE_TLV_INIT_DATA:
                        pieces->init_data = tlv_data;
                        pieces->init_data_size = tlv_len;
                        break;
                case IWL_UCODE_TLV_BOOT:
                        pieces->boot = tlv_data;
                        pieces->boot_size = tlv_len;
                        break;
                case IWL_UCODE_TLV_PROBE_MAX_LEN:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        capa->max_probe_length =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_PAN:
                        if (tlv_len)
                                goto invalid_tlv_len;
                        capa->pan = true;
                        break;
                case IWL_UCODE_TLV_INIT_EVTLOG_PTR:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        pieces->init_evtlog_ptr =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_INIT_EVTLOG_SIZE:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        pieces->init_evtlog_size =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_INIT_ERRLOG_PTR:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        pieces->init_errlog_ptr =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_RUNT_EVTLOG_PTR:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        pieces->inst_evtlog_ptr =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_RUNT_EVTLOG_SIZE:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        pieces->inst_evtlog_size =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_RUNT_ERRLOG_PTR:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        pieces->inst_errlog_ptr =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_ENHANCE_SENS_TBL:
                        if (tlv_len)
                                goto invalid_tlv_len;
                        priv->enhance_sensitivity_table = true;
                        break;
                case IWL_UCODE_TLV_PHY_CALIBRATION_SIZE:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        capa->standard_phy_calibration_size =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                default:
                        IWL_WARN(priv, "unknown TLV: %d\n", tlv_type);
                        break;
                }
        }

        if (len) {
                IWL_ERR(priv, "invalid TLV after parsing: %zd\n", len);
                iwl_print_hex_dump(priv, IWL_DL_FW, (u8 *)data, len);
                return -EINVAL;
        }

        return 0;

 invalid_tlv_len:
        IWL_ERR(priv, "TLV %d has invalid size: %u\n", tlv_type, tlv_len);
        iwl_print_hex_dump(priv, IWL_DL_FW, tlv_data, tlv_len);

        return -EINVAL;
}

/**
 * iwl_ucode_callback - callback when firmware was loaded
 *
 * If loaded successfully, copies the firmware into buffers
 * for the card to fetch (via DMA).
 */
static void iwl_ucode_callback(const struct firmware *ucode_raw, void *context)
{
        struct iwl_priv *priv = context;
        struct iwl_ucode_header *ucode;
        int err;
        struct iwlagn_firmware_pieces pieces;
        const unsigned int api_max = priv->cfg->ucode_api_max;
        const unsigned int api_min = priv->cfg->ucode_api_min;
        u32 api_ver;
        char buildstr[25];
        u32 build;
        struct iwlagn_ucode_capabilities ucode_capa = {
                .max_probe_length = 200,
                .standard_phy_calibration_size =
                        IWL_DEFAULT_STANDARD_PHY_CALIBRATE_TBL_SIZE,
        };

        memset(&pieces, 0, sizeof(pieces));

        if (!ucode_raw) {
                if (priv->fw_index <= priv->cfg->ucode_api_max)
                        IWL_ERR(priv,
                                "request for firmware file '%s' failed.\n",
                                priv->firmware_name);
                goto try_again;
        }

        IWL_DEBUG_INFO(priv, "Loaded firmware file '%s' (%zd bytes).\n",
                       priv->firmware_name, ucode_raw->size);

        /* Make sure that we got at least the API version number */
        if (ucode_raw->size < 4) {
                IWL_ERR(priv, "File size way too small!\n");
                goto try_again;
        }

        /* Data from ucode file:  header followed by uCode images */
        ucode = (struct iwl_ucode_header *)ucode_raw->data;

        if (ucode->ver)
                err = iwlagn_load_legacy_firmware(priv, ucode_raw, &pieces);
        else
                err = iwlagn_load_firmware(priv, ucode_raw, &pieces,
                                           &ucode_capa);

        if (err)
                goto try_again;

        api_ver = IWL_UCODE_API(priv->ucode_ver);
        build = pieces.build;

        /*
         * api_ver should match the api version forming part of the
         * firmware filename ... but we don't check for that and only rely
         * on the API version read from firmware header from here on forward
         */
        /* no api version check required for experimental uCode */
        if (priv->fw_index != UCODE_EXPERIMENTAL_INDEX) {
                if (api_ver < api_min || api_ver > api_max) {
                        IWL_ERR(priv,
                                "Driver unable to support your firmware API. "
                                "Driver supports v%u, firmware is v%u.\n",
                                api_max, api_ver);
                        goto try_again;
                }

                if (api_ver != api_max)
                        IWL_ERR(priv,
                                "Firmware has old API version. Expected v%u, "
                                "got v%u. New firmware can be obtained "
                                "from http://www.intellinuxwireless.org.\n",
                                api_max, api_ver);
        }

        if (build)
                sprintf(buildstr, " build %u%s", build,
                       (priv->fw_index == UCODE_EXPERIMENTAL_INDEX)
                                ? " (EXP)" : "");
        else
                buildstr[0] = '\0';

        IWL_INFO(priv, "loaded firmware version %u.%u.%u.%u%s\n",
                 IWL_UCODE_MAJOR(priv->ucode_ver),
                 IWL_UCODE_MINOR(priv->ucode_ver),
                 IWL_UCODE_API(priv->ucode_ver),
                 IWL_UCODE_SERIAL(priv->ucode_ver),
                 buildstr);

        snprintf(priv->hw->wiphy->fw_version,
                 sizeof(priv->hw->wiphy->fw_version),
                 "%u.%u.%u.%u%s",
                 IWL_UCODE_MAJOR(priv->ucode_ver),
                 IWL_UCODE_MINOR(priv->ucode_ver),
                 IWL_UCODE_API(priv->ucode_ver),
                 IWL_UCODE_SERIAL(priv->ucode_ver),
                 buildstr);

        /*
         * For any of the failures below (before allocating pci memory)
         * we will try to load a version with a smaller API -- maybe the
         * user just got a corrupted version of the latest API.
         */

        IWL_DEBUG_INFO(priv, "f/w package hdr ucode version raw = 0x%x\n",
                       priv->ucode_ver);
        IWL_DEBUG_INFO(priv, "f/w package hdr runtime inst size = %Zd\n",
                       pieces.inst_size);
        IWL_DEBUG_INFO(priv, "f/w package hdr runtime data size = %Zd\n",
                       pieces.data_size);
        IWL_DEBUG_INFO(priv, "f/w package hdr init inst size = %Zd\n",
                       pieces.init_size);
        IWL_DEBUG_INFO(priv, "f/w package hdr init data size = %Zd\n",
                       pieces.init_data_size);
        IWL_DEBUG_INFO(priv, "f/w package hdr boot inst size = %Zd\n",
                       pieces.boot_size);

        /* Verify that uCode images will fit in card's SRAM */
        if (pieces.inst_size > priv->hw_params.max_inst_size) {
                IWL_ERR(priv, "uCode instr len %Zd too large to fit in\n",
                        pieces.inst_size);
                goto try_again;
        }

        if (pieces.data_size > priv->hw_params.max_data_size) {
                IWL_ERR(priv, "uCode data len %Zd too large to fit in\n",
                        pieces.data_size);
                goto try_again;
        }

        if (pieces.init_size > priv->hw_params.max_inst_size) {
                IWL_ERR(priv, "uCode init instr len %Zd too large to fit in\n",
                        pieces.init_size);
                goto try_again;
        }

        if (pieces.init_data_size > priv->hw_params.max_data_size) {
                IWL_ERR(priv, "uCode init data len %Zd too large to fit in\n",
                        pieces.init_data_size);
                goto try_again;
        }

        if (pieces.boot_size > priv->hw_params.max_bsm_size) {
                IWL_ERR(priv, "uCode boot instr len %Zd too large to fit in\n",
                        pieces.boot_size);
                goto try_again;
        }

        /* Allocate ucode buffers for card's bus-master loading ... */

        /* Runtime instructions and 2 copies of data:
         * 1) unmodified from disk
         * 2) backup cache for save/restore during power-downs */
        priv->ucode_code.len = pieces.inst_size;
        iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_code);

        priv->ucode_data.len = pieces.data_size;
        iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_data);

        priv->ucode_data_backup.len = pieces.data_size;
        iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_data_backup);

        if (!priv->ucode_code.v_addr || !priv->ucode_data.v_addr ||
            !priv->ucode_data_backup.v_addr)
                goto err_pci_alloc;

        /* Initialization instructions and data */
        if (pieces.init_size && pieces.init_data_size) {
                priv->ucode_init.len = pieces.init_size;
                iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_init);

                priv->ucode_init_data.len = pieces.init_data_size;
                iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_init_data);

                if (!priv->ucode_init.v_addr || !priv->ucode_init_data.v_addr)
                        goto err_pci_alloc;
        }

        /* Bootstrap (instructions only, no data) */
        if (pieces.boot_size) {
                priv->ucode_boot.len = pieces.boot_size;
                iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_boot);

                if (!priv->ucode_boot.v_addr)
                        goto err_pci_alloc;
        }

        /* Now that we can no longer fail, copy information */

        /*
         * The (size - 16) / 12 formula is based on the information recorded
         * for each event, which is of mode 1 (including timestamp) for all
         * new microcodes that include this information.
         */
        priv->_agn.init_evtlog_ptr = pieces.init_evtlog_ptr;
        if (pieces.init_evtlog_size)
                priv->_agn.init_evtlog_size = (pieces.init_evtlog_size - 16)/12;
        else
                priv->_agn.init_evtlog_size =
                        priv->cfg->base_params->max_event_log_size;
        priv->_agn.init_errlog_ptr = pieces.init_errlog_ptr;
        priv->_agn.inst_evtlog_ptr = pieces.inst_evtlog_ptr;
        if (pieces.inst_evtlog_size)
                priv->_agn.inst_evtlog_size = (pieces.inst_evtlog_size - 16)/12;
        else
                priv->_agn.inst_evtlog_size =
                        priv->cfg->base_params->max_event_log_size;
        priv->_agn.inst_errlog_ptr = pieces.inst_errlog_ptr;

        if (ucode_capa.pan) {
                priv->valid_contexts |= BIT(IWL_RXON_CTX_PAN);
                priv->sta_key_max_num = STA_KEY_MAX_NUM_PAN;
        } else
                priv->sta_key_max_num = STA_KEY_MAX_NUM;

        /* Copy images into buffers for card's bus-master reads ... */

        /* Runtime instructions (first block of data in file) */
        IWL_DEBUG_INFO(priv, "Copying (but not loading) uCode instr len %Zd\n",
                        pieces.inst_size);
        memcpy(priv->ucode_code.v_addr, pieces.inst, pieces.inst_size);

        IWL_DEBUG_INFO(priv, "uCode instr buf vaddr = 0x%p, paddr = 0x%08x\n",
                priv->ucode_code.v_addr, (u32)priv->ucode_code.p_addr);

        /*
         * Runtime data
         * NOTE:  Copy into backup buffer will be done in iwl_up()
         */
        IWL_DEBUG_INFO(priv, "Copying (but not loading) uCode data len %Zd\n",
                        pieces.data_size);
        memcpy(priv->ucode_data.v_addr, pieces.data, pieces.data_size);
        memcpy(priv->ucode_data_backup.v_addr, pieces.data, pieces.data_size);

        /* Initialization instructions */
        if (pieces.init_size) {
                IWL_DEBUG_INFO(priv, "Copying (but not loading) init instr len %Zd\n",
                                pieces.init_size);
                memcpy(priv->ucode_init.v_addr, pieces.init, pieces.init_size);
        }

        /* Initialization data */
        if (pieces.init_data_size) {
                IWL_DEBUG_INFO(priv, "Copying (but not loading) init data len %Zd\n",
                               pieces.init_data_size);
                memcpy(priv->ucode_init_data.v_addr, pieces.init_data,
                       pieces.init_data_size);
        }

        /* Bootstrap instructions */
        IWL_DEBUG_INFO(priv, "Copying (but not loading) boot instr len %Zd\n",
                        pieces.boot_size);
        memcpy(priv->ucode_boot.v_addr, pieces.boot, pieces.boot_size);

        /*
         * figure out the offset of chain noise reset and gain commands
         * base on the size of standard phy calibration commands table size
         */
        if (ucode_capa.standard_phy_calibration_size >
            IWL_MAX_PHY_CALIBRATE_TBL_SIZE)
                ucode_capa.standard_phy_calibration_size =
                        IWL_MAX_STANDARD_PHY_CALIBRATE_TBL_SIZE;

        priv->_agn.phy_calib_chain_noise_reset_cmd =
                ucode_capa.standard_phy_calibration_size;
        priv->_agn.phy_calib_chain_noise_gain_cmd =
                ucode_capa.standard_phy_calibration_size + 1;

        /**************************************************
         * This is still part of probe() in a sense...
         *
         * 9. Setup and register with mac80211 and debugfs
         **************************************************/
        err = iwl_mac_setup_register(priv, &ucode_capa);
        if (err)
                goto out_unbind;

        err = iwl_dbgfs_register(priv, DRV_NAME);
        if (err)
                IWL_ERR(priv, "failed to create debugfs files. Ignoring error: %d\n", err);

        err = sysfs_create_group(&priv->pci_dev->dev.kobj,
                                        &iwl_attribute_group);
        if (err) {
                IWL_ERR(priv, "failed to create sysfs device attributes\n");
                goto out_unbind;
        }

        /* We have our copies now, allow OS release its copies */
        release_firmware(ucode_raw);
        complete(&priv->_agn.firmware_loading_complete);
        return;

 try_again:
        /* try next, if any */
        if (iwl_request_firmware(priv, false))
                goto out_unbind;
        release_firmware(ucode_raw);
        return;

 err_pci_alloc:
        IWL_ERR(priv, "failed to allocate pci memory\n");
        iwl_dealloc_ucode_pci(priv);
 out_unbind:
        complete(&priv->_agn.firmware_loading_complete);
        device_release_driver(&priv->pci_dev->dev);
        release_firmware(ucode_raw);
}

static const char *desc_lookup_text[] = {
        "OK",
        "FAIL",
        "BAD_PARAM",
        "BAD_CHECKSUM",
        "NMI_INTERRUPT_WDG",
        "SYSASSERT",
        "FATAL_ERROR",
        "BAD_COMMAND",
        "HW_ERROR_TUNE_LOCK",
        "HW_ERROR_TEMPERATURE",
        "ILLEGAL_CHAN_FREQ",
        "VCC_NOT_STABLE",
        "FH_ERROR",
        "NMI_INTERRUPT_HOST",
        "NMI_INTERRUPT_ACTION_PT",
        "NMI_INTERRUPT_UNKNOWN",
        "UCODE_VERSION_MISMATCH",
        "HW_ERROR_ABS_LOCK",
        "HW_ERROR_CAL_LOCK_FAIL",
        "NMI_INTERRUPT_INST_ACTION_PT",
        "NMI_INTERRUPT_DATA_ACTION_PT",
        "NMI_TRM_HW_ER",
        "NMI_INTERRUPT_TRM",
        "NMI_INTERRUPT_BREAK_POINT"
        "DEBUG_0",
        "DEBUG_1",
        "DEBUG_2",
        "DEBUG_3",
};

static struct { char *name; u8 num; } advanced_lookup[] = {
        { "NMI_INTERRUPT_WDG", 0x34 },
        { "SYSASSERT", 0x35 },
        { "UCODE_VERSION_MISMATCH", 0x37 },
        { "BAD_COMMAND", 0x38 },
        { "NMI_INTERRUPT_DATA_ACTION_PT", 0x3C },
        { "FATAL_ERROR", 0x3D },
        { "NMI_TRM_HW_ERR", 0x46 },
        { "NMI_INTERRUPT_TRM", 0x4C },
        { "NMI_INTERRUPT_BREAK_POINT", 0x54 },
        { "NMI_INTERRUPT_WDG_RXF_FULL", 0x5C },
        { "NMI_INTERRUPT_WDG_NO_RBD_RXF_FULL", 0x64 },
        { "NMI_INTERRUPT_HOST", 0x66 },
        { "NMI_INTERRUPT_ACTION_PT", 0x7C },
        { "NMI_INTERRUPT_UNKNOWN", 0x84 },
        { "NMI_INTERRUPT_INST_ACTION_PT", 0x86 },
        { "ADVANCED_SYSASSERT", 0 },
};

static const char *desc_lookup(u32 num)
{
        int i;
        int max = ARRAY_SIZE(desc_lookup_text);

        if (num < max)
                return desc_lookup_text[num];

        max = ARRAY_SIZE(advanced_lookup) - 1;
        for (i = 0; i < max; i++) {
                if (advanced_lookup[i].num == num)
                        break;;
        }
        return advanced_lookup[i].name;
}

#define ERROR_START_OFFSET  (1 * sizeof(u32))
#define ERROR_ELEM_SIZE     (7 * sizeof(u32))

void iwl_dump_nic_error_log(struct iwl_priv *priv)
{
        u32 data2, line;
        u32 desc, time, count, base, data1;
        u32 blink1, blink2, ilink1, ilink2;
        u32 pc, hcmd;

        if (priv->ucode_type == UCODE_INIT) {
                base = le32_to_cpu(priv->card_alive_init.error_event_table_ptr);
                if (!base)
                        base = priv->_agn.init_errlog_ptr;
        } else {
                base = le32_to_cpu(priv->card_alive.error_event_table_ptr);
                if (!base)
                        base = priv->_agn.inst_errlog_ptr;
        }

        if (!priv->cfg->ops->lib->is_valid_rtc_data_addr(base)) {
                IWL_ERR(priv,
                        "Not valid error log pointer 0x%08X for %s uCode\n",
                        base, (priv->ucode_type == UCODE_INIT) ? "Init" : "RT");
                return;
        }

        count = iwl_read_targ_mem(priv, base);

        if (ERROR_START_OFFSET <= count * ERROR_ELEM_SIZE) {
                IWL_ERR(priv, "Start IWL Error Log Dump:\n");
                IWL_ERR(priv, "Status: 0x%08lX, count: %d\n",
                        priv->status, count);
        }

        desc = iwl_read_targ_mem(priv, base + 1 * sizeof(u32));
        priv->isr_stats.err_code = desc;
        pc = iwl_read_targ_mem(priv, base + 2 * sizeof(u32));
        blink1 = iwl_read_targ_mem(priv, base + 3 * sizeof(u32));
        blink2 = iwl_read_targ_mem(priv, base + 4 * sizeof(u32));
        ilink1 = iwl_read_targ_mem(priv, base + 5 * sizeof(u32));
        ilink2 = iwl_read_targ_mem(priv, base + 6 * sizeof(u32));
        data1 = iwl_read_targ_mem(priv, base + 7 * sizeof(u32));
        data2 = iwl_read_targ_mem(priv, base + 8 * sizeof(u32));
        line = iwl_read_targ_mem(priv, base + 9 * sizeof(u32));
        time = iwl_read_targ_mem(priv, base + 11 * sizeof(u32));
        hcmd = iwl_read_targ_mem(priv, base + 22 * sizeof(u32));

        trace_iwlwifi_dev_ucode_error(priv, desc, time, data1, data2, line,
                                      blink1, blink2, ilink1, ilink2);

        IWL_ERR(priv, "Desc                                  Time       "
                "data1      data2      line\n");
        IWL_ERR(priv, "%-28s (0x%04X) %010u 0x%08X 0x%08X %u\n",
                desc_lookup(desc), desc, time, data1, data2, line);
        IWL_ERR(priv, "pc      blink1  blink2  ilink1  ilink2  hcmd\n");
        IWL_ERR(priv, "0x%05X 0x%05X 0x%05X 0x%05X 0x%05X 0x%05X\n",
                pc, blink1, blink2, ilink1, ilink2, hcmd);
}

#define EVENT_START_OFFSET  (4 * sizeof(u32))

/**
 * iwl_print_event_log - Dump error event log to syslog
 *
 */
static int iwl_print_event_log(struct iwl_priv *priv, u32 start_idx,
                               u32 num_events, u32 mode,
                               int pos, char **buf, size_t bufsz)
{
        u32 i;
        u32 base;       /* SRAM byte address of event log header */
        u32 event_size; /* 2 u32s, or 3 u32s if timestamp recorded */
        u32 ptr;        /* SRAM byte address of log data */
        u32 ev, time, data; /* event log data */
        unsigned long reg_flags;

        if (num_events == 0)
                return pos;

        if (priv->ucode_type == UCODE_INIT) {
                base = le32_to_cpu(priv->card_alive_init.log_event_table_ptr);
                if (!base)
                        base = priv->_agn.init_evtlog_ptr;
        } else {
                base = le32_to_cpu(priv->card_alive.log_event_table_ptr);
                if (!base)
                        base = priv->_agn.inst_evtlog_ptr;
        }

        if (mode == 0)
                event_size = 2 * sizeof(u32);
        else
                event_size = 3 * sizeof(u32);

        ptr = base + EVENT_START_OFFSET + (start_idx * event_size);

        /* Make sure device is powered up for SRAM reads */
        spin_lock_irqsave(&priv->reg_lock, reg_flags);
        iwl_grab_nic_access(priv);

        /* Set starting address; reads will auto-increment */
        _iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR, ptr);
        rmb();

        /* "time" is actually "data" for mode 0 (no timestamp).
        * place event id # at far right for easier visual parsing. */
        for (i = 0; i < num_events; i++) {
                ev = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
                time = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
                if (mode == 0) {
                        /* data, ev */
                        if (bufsz) {
                                pos += scnprintf(*buf + pos, bufsz - pos,
                                                "EVT_LOG:0x%08x:%04u\n",
                                                time, ev);
                        } else {
                                trace_iwlwifi_dev_ucode_event(priv, 0,
                                        time, ev);
                                IWL_ERR(priv, "EVT_LOG:0x%08x:%04u\n",
                                        time, ev);
                        }
                } else {
                        data = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
                        if (bufsz) {
                                pos += scnprintf(*buf + pos, bufsz - pos,
                                                "EVT_LOGT:%010u:0x%08x:%04u\n",
                                                 time, data, ev);
                        } else {
                                IWL_ERR(priv, "EVT_LOGT:%010u:0x%08x:%04u\n",
                                        time, data, ev);
                                trace_iwlwifi_dev_ucode_event(priv, time,
                                        data, ev);
                        }
                }
        }

        /* Allow device to power down */
        iwl_release_nic_access(priv);
        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
        return pos;
}

/**
 * iwl_print_last_event_logs - Dump the newest # of event log to syslog
 */
static int iwl_print_last_event_logs(struct iwl_priv *priv, u32 capacity,
                                    u32 num_wraps, u32 next_entry,
                                    u32 size, u32 mode,
                                    int pos, char **buf, size_t bufsz)
{
        /*
         * display the newest DEFAULT_LOG_ENTRIES entries
         * i.e the entries just before the next ont that uCode would fill.
         */
        if (num_wraps) {
                if (next_entry < size) {
                        pos = iwl_print_event_log(priv,
                                                capacity - (size - next_entry),
                                                size - next_entry, mode,
                                                pos, buf, bufsz);
                        pos = iwl_print_event_log(priv, 0,
                                                  next_entry, mode,
                                                  pos, buf, bufsz);
                } else
                        pos = iwl_print_event_log(priv, next_entry - size,
                                                  size, mode, pos, buf, bufsz);
        } else {
                if (next_entry < size) {
                        pos = iwl_print_event_log(priv, 0, next_entry,
                                                  mode, pos, buf, bufsz);
                } else {
                        pos = iwl_print_event_log(priv, next_entry - size,
                                                  size, mode, pos, buf, bufsz);
                }
        }
        return pos;
}

#define DEFAULT_DUMP_EVENT_LOG_ENTRIES (20)

int iwl_dump_nic_event_log(struct iwl_priv *priv, bool full_log,
                            char **buf, bool display)
{
        u32 base;       /* SRAM byte address of event log header */
        u32 capacity;   /* event log capacity in # entries */
        u32 mode;       /* 0 - no timestamp, 1 - timestamp recorded */
        u32 num_wraps;  /* # times uCode wrapped to top of log */
        u32 next_entry; /* index of next entry to be written by uCode */
        u32 size;       /* # entries that we'll print */
        u32 logsize;
        int pos = 0;
        size_t bufsz = 0;

        if (priv->ucode_type == UCODE_INIT) {
                base = le32_to_cpu(priv->card_alive_init.log_event_table_ptr);
                logsize = priv->_agn.init_evtlog_size;
                if (!base)
                        base = priv->_agn.init_evtlog_ptr;
        } else {
                base = le32_to_cpu(priv->card_alive.log_event_table_ptr);
                logsize = priv->_agn.inst_evtlog_size;
                if (!base)
                        base = priv->_agn.inst_evtlog_ptr;
        }

        if (!priv->cfg->ops->lib->is_valid_rtc_data_addr(base)) {
                IWL_ERR(priv,
                        "Invalid event log pointer 0x%08X for %s uCode\n",
                        base, (priv->ucode_type == UCODE_INIT) ? "Init" : "RT");
                return -EINVAL;
        }

        /* event log header */
        capacity = iwl_read_targ_mem(priv, base);
        mode = iwl_read_targ_mem(priv, base + (1 * sizeof(u32)));
        num_wraps = iwl_read_targ_mem(priv, base + (2 * sizeof(u32)));
        next_entry = iwl_read_targ_mem(priv, base + (3 * sizeof(u32)));

        if (capacity > logsize) {
                IWL_ERR(priv, "Log capacity %d is bogus, limit to %d entries\n",
                        capacity, logsize);
                capacity = logsize;
        }

        if (next_entry > logsize) {
                IWL_ERR(priv, "Log write index %d is bogus, limit to %d\n",
                        next_entry, logsize);
                next_entry = logsize;
        }

        size = num_wraps ? capacity : next_entry;

        /* bail out if nothing in log */
        if (size == 0) {
                IWL_ERR(priv, "Start IWL Event Log Dump: nothing in log\n");
                return pos;
        }

        /* enable/disable bt channel inhibition */
        priv->bt_ch_announce = iwlagn_bt_ch_announce;

#ifdef CONFIG_IWLWIFI_DEBUG
        if (!(iwl_get_debug_level(priv) & IWL_DL_FW_ERRORS) && !full_log)
                size = (size > DEFAULT_DUMP_EVENT_LOG_ENTRIES)
                        ? DEFAULT_DUMP_EVENT_LOG_ENTRIES : size;
#else
        size = (size > DEFAULT_DUMP_EVENT_LOG_ENTRIES)
                ? DEFAULT_DUMP_EVENT_LOG_ENTRIES : size;
#endif
        IWL_ERR(priv, "Start IWL Event Log Dump: display last %u entries\n",
                size);

#ifdef CONFIG_IWLWIFI_DEBUG
        if (display) {
                if (full_log)
                        bufsz = capacity * 48;
                else
                        bufsz = size * 48;
                *buf = kmalloc(bufsz, GFP_KERNEL);
                if (!*buf)
                        return -ENOMEM;
        }
        if ((iwl_get_debug_level(priv) & IWL_DL_FW_ERRORS) || full_log) {
                /*
                 * if uCode has wrapped back to top of log,
                 * start at the oldest entry,
                 * i.e the next one that uCode would fill.
                 */
                if (num_wraps)
                        pos = iwl_print_event_log(priv, next_entry,
                                                capacity - next_entry, mode,
                                                pos, buf, bufsz);
                /* (then/else) start at top of log */
                pos = iwl_print_event_log(priv, 0,
                                          next_entry, mode, pos, buf, bufsz);
        } else
                pos = iwl_print_last_event_logs(priv, capacity, num_wraps,
                                                next_entry, size, mode,
                                                pos, buf, bufsz);
#else
        pos = iwl_print_last_event_logs(priv, capacity, num_wraps,
                                        next_entry, size, mode,
                                        pos, buf, bufsz);
#endif
        return pos;
}

static void iwl_rf_kill_ct_config(struct iwl_priv *priv)
{
        struct iwl_ct_kill_config cmd;
        struct iwl_ct_kill_throttling_config adv_cmd;
        unsigned long flags;
        int ret = 0;

        spin_lock_irqsave(&priv->lock, flags);
        iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
                    CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
        spin_unlock_irqrestore(&priv->lock, flags);
        priv->thermal_throttle.ct_kill_toggle = false;

        if (priv->cfg->base_params->support_ct_kill_exit) {
                adv_cmd.critical_temperature_enter =
                        cpu_to_le32(priv->hw_params.ct_kill_threshold);
                adv_cmd.critical_temperature_exit =
                        cpu_to_le32(priv->hw_params.ct_kill_exit_threshold);

                ret = iwl_send_cmd_pdu(priv, REPLY_CT_KILL_CONFIG_CMD,
                                       sizeof(adv_cmd), &adv_cmd);
                if (ret)
                        IWL_ERR(priv, "REPLY_CT_KILL_CONFIG_CMD failed\n");
                else
                        IWL_DEBUG_INFO(priv, "REPLY_CT_KILL_CONFIG_CMD "
                                        "succeeded, "
                                        "critical temperature enter is %d,"
                                        "exit is %d\n",
                                       priv->hw_params.ct_kill_threshold,
                                       priv->hw_params.ct_kill_exit_threshold);
        } else {
                cmd.critical_temperature_R =
                        cpu_to_le32(priv->hw_params.ct_kill_threshold);

                ret = iwl_send_cmd_pdu(priv, REPLY_CT_KILL_CONFIG_CMD,
                                       sizeof(cmd), &cmd);
                if (ret)
                        IWL_ERR(priv, "REPLY_CT_KILL_CONFIG_CMD failed\n");
                else
                        IWL_DEBUG_INFO(priv, "REPLY_CT_KILL_CONFIG_CMD "
                                        "succeeded, "
                                        "critical temperature is %d\n",
                                        priv->hw_params.ct_kill_threshold);
        }
}

static int iwlagn_send_calib_cfg_rt(struct iwl_priv *priv, u32 cfg)
{
        struct iwl_calib_cfg_cmd calib_cfg_cmd;
        struct iwl_host_cmd cmd = {
                .id = CALIBRATION_CFG_CMD,
                .len = sizeof(struct iwl_calib_cfg_cmd),
                .data = &calib_cfg_cmd,
        };

        memset(&calib_cfg_cmd, 0, sizeof(calib_cfg_cmd));
        calib_cfg_cmd.ucd_calib_cfg.once.is_enable = IWL_CALIB_INIT_CFG_ALL;
        calib_cfg_cmd.ucd_calib_cfg.once.start = cpu_to_le32(cfg);

        return iwl_send_cmd(priv, &cmd);
}


/**
 * iwl_alive_start - called after REPLY_ALIVE notification received
 *                   from protocol/runtime uCode (initialization uCode's
 *                   Alive gets handled by iwl_init_alive_start()).
 */
static void iwl_alive_start(struct iwl_priv *priv)
{
        int ret = 0;
        struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];

        IWL_DEBUG_INFO(priv, "Runtime Alive received.\n");

        if (priv->card_alive.is_valid != UCODE_VALID_OK) {
                /* We had an error bringing up the hardware, so take it
                 * all the way back down so we can try again */
                IWL_DEBUG_INFO(priv, "Alive failed.\n");
                goto restart;
        }

        /* Initialize uCode has loaded Runtime uCode ... verify inst image.
         * This is a paranoid check, because we would not have gotten the
         * "runtime" alive if code weren't properly loaded.  */
        if (iwl_verify_ucode(priv)) {
                /* Runtime instruction load was bad;
                 * take it all the way back down so we can try again */
                IWL_DEBUG_INFO(priv, "Bad runtime uCode load.\n");
                goto restart;
        }

        ret = priv->cfg->ops->lib->alive_notify(priv);
        if (ret) {
                IWL_WARN(priv,
                        "Could not complete ALIVE transition [ntf]: %d\n", ret);
                goto restart;
        }


        /* After the ALIVE response, we can send host commands to the uCode */
        set_bit(STATUS_ALIVE, &priv->status);

        /* Enable watchdog to monitor the driver tx queues */
        iwl_setup_watchdog(priv);

        if (iwl_is_rfkill(priv))
                return;

        /* download priority table before any calibration request */
        if (priv->cfg->bt_params &&
            priv->cfg->bt_params->advanced_bt_coexist) {
                /* Configure Bluetooth device coexistence support */
                priv->bt_valid = IWLAGN_BT_ALL_VALID_MSK;
                priv->kill_ack_mask = IWLAGN_BT_KILL_ACK_MASK_DEFAULT;
                priv->kill_cts_mask = IWLAGN_BT_KILL_CTS_MASK_DEFAULT;
                priv->cfg->ops->hcmd->send_bt_config(priv);
                priv->bt_valid = IWLAGN_BT_VALID_ENABLE_FLAGS;
                iwlagn_send_prio_tbl(priv);

                /* FIXME: w/a to force change uCode BT state machine */
                iwlagn_send_bt_env(priv, IWL_BT_COEX_ENV_OPEN,
                        BT_COEX_PRIO_TBL_EVT_INIT_CALIB2);
                iwlagn_send_bt_env(priv, IWL_BT_COEX_ENV_CLOSE,
                        BT_COEX_PRIO_TBL_EVT_INIT_CALIB2);
        }
        if (priv->hw_params.calib_rt_cfg)
                iwlagn_send_calib_cfg_rt(priv, priv->hw_params.calib_rt_cfg);

        ieee80211_wake_queues(priv->hw);

        priv->active_rate = IWL_RATES_MASK;

        /* Configure Tx antenna selection based on H/W config */
        if (priv->cfg->ops->hcmd->set_tx_ant)
                priv->cfg->ops->hcmd->set_tx_ant(priv, priv->cfg->valid_tx_ant);

        if (iwl_is_associated_ctx(ctx)) {
                struct iwl_rxon_cmd *active_rxon =
                                (struct iwl_rxon_cmd *)&ctx->active;
                /* apply any changes in staging */
                ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
                active_rxon->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
        } else {
                struct iwl_rxon_context *tmp;
                /* Initialize our rx_config data */
                for_each_context(priv, tmp)
                        iwl_connection_init_rx_config(priv, tmp);

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

        if (priv->cfg->bt_params &&
            !priv->cfg->bt_params->advanced_bt_coexist) {
                /* Configure Bluetooth device coexistence support */
                priv->cfg->ops->hcmd->send_bt_config(priv);
        }

        iwl_reset_run_time_calib(priv);

        set_bit(STATUS_READY, &priv->status);

        /* Configure the adapter for unassociated operation */
        iwlcore_commit_rxon(priv, ctx);

        /* At this point, the NIC is initialized and operational */
        iwl_rf_kill_ct_config(priv);

        iwl_leds_init(priv);

        IWL_DEBUG_INFO(priv, "ALIVE processing complete.\n");
        wake_up_interruptible(&priv->wait_command_queue);

        iwl_power_update_mode(priv, true);
        IWL_DEBUG_INFO(priv, "Updated power mode\n");


        return;

 restart:
        queue_work(priv->workqueue, &priv->restart);
}

static void iwl_cancel_deferred_work(struct iwl_priv *priv);

static void __iwl_down(struct iwl_priv *priv)
{
        unsigned long flags;
        int exit_pending = test_bit(STATUS_EXIT_PENDING, &priv->status);

        IWL_DEBUG_INFO(priv, DRV_NAME " is going down\n");

        iwl_scan_cancel_timeout(priv, 200);

        exit_pending = test_and_set_bit(STATUS_EXIT_PENDING, &priv->status);

        /* Stop TX queues watchdog. We need to have STATUS_EXIT_PENDING bit set
         * to prevent rearm timer */
        del_timer_sync(&priv->watchdog);

        iwl_clear_ucode_stations(priv, NULL);
        iwl_dealloc_bcast_stations(priv);
        iwl_clear_driver_stations(priv);

        /* reset BT coex data */
        priv->bt_status = 0;
        if (priv->cfg->bt_params)
                priv->bt_traffic_load =
                         priv->cfg->bt_params->bt_init_traffic_load;
        else
                priv->bt_traffic_load = 0;
        priv->bt_sco_active = false;
        priv->bt_full_concurrent = false;
        priv->bt_ci_compliance = 0;

        /* Unblock any waiting calls */
        wake_up_interruptible_all(&priv->wait_command_queue);

        /* Wipe out the EXIT_PENDING status bit if we are not actually
         * exiting the module */
        if (!exit_pending)
                clear_bit(STATUS_EXIT_PENDING, &priv->status);

        /* stop and reset the on-board processor */
        iwl_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET);

        /* tell the device to stop sending interrupts */
        spin_lock_irqsave(&priv->lock, flags);
        iwl_disable_interrupts(priv);
        spin_unlock_irqrestore(&priv->lock, flags);
        iwl_synchronize_irq(priv);

        if (priv->mac80211_registered)
                ieee80211_stop_queues(priv->hw);

        /* If we have not previously called iwl_init() then
         * clear all bits but the RF Kill bit and return */
        if (!iwl_is_init(priv)) {
                priv->status = test_bit(STATUS_RF_KILL_HW, &priv->status) <<
                                        STATUS_RF_KILL_HW |
                               test_bit(STATUS_GEO_CONFIGURED, &priv->status) <<
                                        STATUS_GEO_CONFIGURED |
                               test_bit(STATUS_EXIT_PENDING, &priv->status) <<
                                        STATUS_EXIT_PENDING;
                goto exit;
        }

        /* ...otherwise clear out all the status bits but the RF Kill
         * bit and continue taking the NIC down. */
        priv->status &= test_bit(STATUS_RF_KILL_HW, &priv->status) <<
                                STATUS_RF_KILL_HW |
                        test_bit(STATUS_GEO_CONFIGURED, &priv->status) <<
                                STATUS_GEO_CONFIGURED |
                        test_bit(STATUS_FW_ERROR, &priv->status) <<
                                STATUS_FW_ERROR |
                       test_bit(STATUS_EXIT_PENDING, &priv->status) <<
                                STATUS_EXIT_PENDING;

        /* device going down, Stop using ICT table */
        if (priv->cfg->ops->lib->isr_ops.disable)
                priv->cfg->ops->lib->isr_ops.disable(priv);

        iwlagn_txq_ctx_stop(priv);
        iwlagn_rxq_stop(priv);

        /* Power-down device's busmaster DMA clocks */
        iwl_write_prph(priv, APMG_CLK_DIS_REG, APMG_CLK_VAL_DMA_CLK_RQT);
        udelay(5);

        /* Make sure (redundant) we've released our request to stay awake */
        iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);

        /* Stop the device, and put it in low power state */
        iwl_apm_stop(priv);

 exit:
        memset(&priv->card_alive, 0, sizeof(struct iwl_alive_resp));

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

        /* clear out any free frames */
        iwl_clear_free_frames(priv);
}

static void iwl_down(struct iwl_priv *priv)
{
        mutex_lock(&priv->mutex);
        __iwl_down(priv);
        mutex_unlock(&priv->mutex);

        iwl_cancel_deferred_work(priv);
}

#define HW_READY_TIMEOUT (50)

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

        iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
                CSR_HW_IF_CONFIG_REG_BIT_NIC_READY);

        /* See if we got it */
        ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
                                CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
                                CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
                                HW_READY_TIMEOUT);
        if (ret != -ETIMEDOUT)
                priv->hw_ready = true;
        else
                priv->hw_ready = false;

        IWL_DEBUG_INFO(priv, "hardware %s\n",
                      (priv->hw_ready == 1) ? "ready" : "not ready");
        return ret;
}

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

        IWL_DEBUG_INFO(priv, "iwl_prepare_card_hw enter\n");

        ret = iwl_set_hw_ready(priv);
        if (priv->hw_ready)
                return ret;

        /* If HW is not ready, prepare the conditions to check again */
        iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
                        CSR_HW_IF_CONFIG_REG_PREPARE);

        ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
                        ~CSR_HW_IF_CONFIG_REG_BIT_NIC_PREPARE_DONE,
                        CSR_HW_IF_CONFIG_REG_BIT_NIC_PREPARE_DONE, 150000);

        /* HW should be ready by now, check again. */
        if (ret != -ETIMEDOUT)
                iwl_set_hw_ready(priv);

        return ret;
}

#define MAX_HW_RESTARTS 5

static int __iwl_up(struct iwl_priv *priv)
{
        struct iwl_rxon_context *ctx;
        int i;
        int ret;

        if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
                IWL_WARN(priv, "Exit pending; will not bring the NIC up\n");
                return -EIO;
        }

        if (!priv->ucode_data_backup.v_addr || !priv->ucode_data.v_addr) {
                IWL_ERR(priv, "ucode not available for device bringup\n");
                return -EIO;
        }

        for_each_context(priv, ctx) {
                ret = iwlagn_alloc_bcast_station(priv, ctx);
                if (ret) {
                        iwl_dealloc_bcast_stations(priv);
                        return ret;
                }
        }

        iwl_prepare_card_hw(priv);

        if (!priv->hw_ready) {
                IWL_WARN(priv, "Exit HW not ready\n");
                return -EIO;
        }

        /* If platform's RF_KILL switch is NOT set to KILL */
        if (iwl_read32(priv, CSR_GP_CNTRL) & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW)
                clear_bit(STATUS_RF_KILL_HW, &priv->status);
        else
                set_bit(STATUS_RF_KILL_HW, &priv->status);

        if (iwl_is_rfkill(priv)) {
                wiphy_rfkill_set_hw_state(priv->hw->wiphy, true);

                iwl_enable_interrupts(priv);
                IWL_WARN(priv, "Radio disabled by HW RF Kill switch\n");
                return 0;
        }

        iwl_write32(priv, CSR_INT, 0xFFFFFFFF);

        /* must be initialised before iwl_hw_nic_init */
        if (priv->valid_contexts != BIT(IWL_RXON_CTX_BSS))
                priv->cmd_queue = IWL_IPAN_CMD_QUEUE_NUM;
        else
                priv->cmd_queue = IWL_DEFAULT_CMD_QUEUE_NUM;

        ret = iwlagn_hw_nic_init(priv);
        if (ret) {
                IWL_ERR(priv, "Unable to init nic\n");
                return ret;
        }

        /* make sure rfkill handshake bits are cleared */
        iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
        iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
                    CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);

        /* clear (again), then enable host interrupts */
        iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
        iwl_enable_interrupts(priv);

        /* really make sure rfkill handshake bits are cleared */
        iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
        iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);

        /* Copy original ucode data image from disk into backup cache.
         * This will be used to initialize the on-board processor's
         * data SRAM for a clean start when the runtime program first loads. */
        memcpy(priv->ucode_data_backup.v_addr, priv->ucode_data.v_addr,
               priv->ucode_data.len);

        for (i = 0; i < MAX_HW_RESTARTS; i++) {

                /* load bootstrap state machine,
                 * load bootstrap program into processor's memory,
                 * prepare to load the "initialize" uCode */
                ret = priv->cfg->ops->lib->load_ucode(priv);

                if (ret) {
                        IWL_ERR(priv, "Unable to set up bootstrap uCode: %d\n",
                                ret);
                        continue;
                }

                /* start card; "initialize" will load runtime ucode */
                iwl_nic_start(priv);

                IWL_DEBUG_INFO(priv, DRV_NAME " is coming up\n");