/******************************************************************************
 *
 * 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
 *
 *****************************************************************************/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.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-calib.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");

/*************** STATION TABLE MANAGEMENT ****
 * mac80211 should be examined to determine if sta_info is duplicating
 * the functionality provided here
 */

/**************************************************************/

/**
 * iwl_commit_rxon - commit staging_rxon to hardware
 *
 * The RXON command in staging_rxon is committed to the hardware and
 * the active_rxon structure is updated with the new data.  This
 * function correctly transitions out of the RXON_ASSOC_MSK state if
 * a HW tune is required based on the RXON structure changes.
 */
int iwl_commit_rxon(struct iwl_priv *priv)
{
        /* cast away the const for active_rxon in this function */
        struct iwl_rxon_cmd *active_rxon = (void *)&priv->active_rxon;
        int ret;
        bool new_assoc =
                !!(priv->staging_rxon.filter_flags & RXON_FILTER_ASSOC_MSK);

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

        /* always get timestamp with Rx frame */
        priv->staging_rxon.flags |= RXON_FLG_TSF2HOST_MSK;

        ret = iwl_check_rxon_cmd(priv);
        if (ret) {
                IWL_ERR(priv, "Invalid RXON configuration.  Not committing.\n");
                return -EINVAL;
        }

        /*
         * receive commit_rxon request
         * abort any previous channel switch if still in process
         */
        if (priv->switch_rxon.switch_in_progress &&
            (priv->switch_rxon.channel != priv->staging_rxon.channel)) {
                IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
                      le16_to_cpu(priv->switch_rxon.channel));
                priv->switch_rxon.switch_in_progress = false;
        }

        /* If we don't need to send a full RXON, we can use
         * iwl_rxon_assoc_cmd which is used to reconfigure filter
         * and other flags for the current radio configuration. */
        if (!iwl_full_rxon_required(priv)) {
                ret = iwl_send_rxon_assoc(priv);
                if (ret) {
                        IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
                        return ret;
                }

                memcpy(active_rxon, &priv->staging_rxon, sizeof(*active_rxon));
                iwl_print_rx_config_cmd(priv);
                return 0;
        }

        /* station table will be cleared */
        priv->assoc_station_added = 0;

        /* If we are currently associated and the new config requires
         * an RXON_ASSOC and the new config wants the associated mask enabled,
         * we must clear the associated from the active configuration
         * before we apply the new config */
        if (iwl_is_associated(priv) && new_assoc) {
                IWL_DEBUG_INFO(priv, "Toggling associated bit on current RXON\n");
                active_rxon->filter_flags &= ~RXON_FILTER_ASSOC_MSK;

                ret = iwl_send_cmd_pdu(priv, REPLY_RXON,
                                      sizeof(struct iwl_rxon_cmd),
                                      &priv->active_rxon);

                /* If the mask clearing failed then we set
                 * active_rxon back to what it was previously */
                if (ret) {
                        active_rxon->filter_flags |= RXON_FILTER_ASSOC_MSK;
                        IWL_ERR(priv, "Error clearing ASSOC_MSK (%d)\n", ret);
                        return ret;
                }
        }

        IWL_DEBUG_INFO(priv, "Sending RXON\n"
                       "* with%s RXON_FILTER_ASSOC_MSK\n"
                       "* channel = %d\n"
                       "* bssid = %pM\n",
                       (new_assoc ? "" : "out"),
                       le16_to_cpu(priv->staging_rxon.channel),
                       priv->staging_rxon.bssid_addr);

        iwl_set_rxon_hwcrypto(priv, !priv->cfg->mod_params->sw_crypto);

        /* Apply the new configuration
         * RXON unassoc clears the station table in uCode, send it before
         * we add the bcast station. If assoc bit is set, we will send RXON
         * after having added the bcast and bssid station.
         */
        if (!new_assoc) {
                ret = iwl_send_cmd_pdu(priv, REPLY_RXON,
                              sizeof(struct iwl_rxon_cmd), &priv->staging_rxon);
                if (ret) {
                        IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
                        return ret;
                }
                memcpy(active_rxon, &priv->staging_rxon, sizeof(*active_rxon));
        }

        iwl_clear_stations_table(priv);

        priv->start_calib = 0;

        /* Add the broadcast address so we can send broadcast frames */
        priv->cfg->ops->lib->add_bcast_station(priv);


        /* If we have set the ASSOC_MSK and we are in BSS mode then
         * add the IWL_AP_ID to the station rate table */
        if (new_assoc) {
                if (priv->iw_mode == NL80211_IFTYPE_STATION) {
                        ret = iwl_rxon_add_station(priv,
                                           priv->active_rxon.bssid_addr, 1);
                        if (ret == IWL_INVALID_STATION) {
                                IWL_ERR(priv,
                                        "Error adding AP address for TX.\n");
                                return -EIO;
                        }
                        priv->assoc_station_added = 1;
                        if (priv->default_wep_key &&
                            iwl_send_static_wepkey_cmd(priv, 0))
                                IWL_ERR(priv,
                                        "Could not send WEP static key.\n");
                }

                /*
                 * allow CTS-to-self if possible for new association.
                 * this is relevant only for 5000 series and up,
                 * but will not damage 4965
                 */
                priv->staging_rxon.flags |= RXON_FLG_SELF_CTS_EN;

                /* Apply the new configuration
                 * RXON assoc doesn't clear the station table in uCode,
                 */
                ret = iwl_send_cmd_pdu(priv, REPLY_RXON,
                              sizeof(struct iwl_rxon_cmd), &priv->staging_rxon);
                if (ret) {
                        IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
                        return ret;
                }
                memcpy(active_rxon, &priv->staging_rxon, sizeof(*active_rxon));
        }
        iwl_print_rx_config_cmd(priv);

        iwl_init_sensitivity(priv);

        /* If we issue a new RXON command which required a tune then we must
         * send a new TXPOWER command or we won't be able to Tx any frames */
        ret = iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
        if (ret) {
                IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
                return ret;
        }

        return 0;
}

void iwl_update_chain_flags(struct iwl_priv *priv)
{

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

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)
{
        if (!iwl_is_associated(priv) || !priv->ibss_beacon ||
            ((priv->iw_mode != NL80211_IFTYPE_ADHOC) &&
             (priv->iw_mode != NL80211_IFTYPE_AP)))
                return 0;

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

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

        return priv->ibss_beacon->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.
         */

        /* 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;

        /* Set up TX command fields */
        tx_beacon_cmd->tx.len = cpu_to_le16((u16)frame_size);
        tx_beacon_cmd->tx.sta_id = priv->hw_params.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->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_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;
}
static int iwl_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,
                                pci_unmap_addr(&txq->meta[index], mapping),
                                pci_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);

                if (txq->txb) {
                        dev_kfree_skb(txq->txb[txq->q.read_ptr].skb[i - 1]);
                        txq->txb[txq->q.read_ptr].skb[i - 1] = 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;

        /* Pull updated AP beacon from mac80211. will fail if not in AP mode */
        beacon = ieee80211_beacon_get(priv->hw, priv->vif);

        if (!beacon) {
                IWL_ERR(priv, "update beacon failed\n");
                return;
        }

        mutex_lock(&priv->mutex);
        /* new beacon skb is allocated every time; dispose previous.*/
        if (priv->ibss_beacon)
                dev_kfree_skb(priv->ibss_beacon);

        priv->ibss_beacon = beacon;
        mutex_unlock(&priv->mutex);

        iwl_send_beacon_cmd(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)
{
#ifdef CONFIG_IWLWIFI_DEBUG
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl4965_beacon_notif *beacon =
                (struct iwl4965_beacon_notif *)pkt->u.raw;
        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

        if ((priv->iw_mode == NL80211_IFTYPE_AP) &&
            (!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);
}

int iwl_set_pwr_src(struct iwl_priv *priv, enum iwl_pwr_src src)
{
        if (src == IWL_PWR_SRC_VAUX) {
                if (pci_pme_capable(priv->pci_dev, PCI_D3cold))
                        iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
                                               APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
                                               ~APMG_PS_CTRL_MSK_PWR_SRC);
        } else {
                iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
                                       APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
                                       ~APMG_PS_CTRL_MSK_PWR_SRC);
        }

        return 0;
}

/**
 * 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] = iwl_rx_reply_rx_phy;
        priv->rx_handlers[REPLY_RX_MPDU_CMD] = iwl_rx_reply_rx;
        /* block ack */
        priv->rx_handlers[REPLY_COMPRESSED_BA] = iwl_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) {
                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);

                trace_iwlwifi_dev_rx(priv, pkt,
                        le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK);

                /* 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;
                                iwl_rx_replenish_now(priv);
                                count = 0;
                        }
                }
        }

        /* Backtrack one entry */
        rxq->read = i;
        if (fill_rx)
                iwl_rx_replenish_now(priv);
        else
                iwl_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++;
                priv->isr_stats.sw_err = inta;
                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 diabled by irq */
        if (test_bit(STATUS_INT_ENABLED, &priv->status))
                iwl_enable_interrupts(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->inta | ~priv->inta_mask);

        inta = priv->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->inta */
        priv->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++;
                priv->isr_stats.sw_err = inta;
                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 diabled by irq */
        if (test_bit(STATUS_INT_ENABLED, &priv->status))
                iwl_enable_interrupts(priv);
}


/******************************************************************************
 *
 * 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);
}


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

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

        if (first)
                priv->fw_index = priv->cfg->ucode_api_max;
        else
                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%d%s",
                name_pre, priv->fw_index, ".ucode");

        IWL_DEBUG_INFO(priv, "attempting to load firmware '%s'\n",
                       priv->firmware_name);

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

/**
 * 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;
        const unsigned int api_max = priv->cfg->ucode_api_max;
        const unsigned int api_min = priv->cfg->ucode_api_min;
        u8 *src;
        size_t len;
        u32 api_ver, build;
        u32 inst_size, data_size, init_size, init_data_size, boot_size;
        int err;
        u16 eeprom_ver;

        if (!ucode_raw) {
                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 v1 header! */
        if (ucode_raw->size < priv->cfg->ops->ucode->get_header_size(1)) {
                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;

        priv->ucode_ver = le32_to_cpu(ucode->ver);
        api_ver = IWL_UCODE_API(priv->ucode_ver);
        build = priv->cfg->ops->ucode->get_build(ucode, api_ver);
        inst_size = priv->cfg->ops->ucode->get_inst_size(ucode, api_ver);
        data_size = priv->cfg->ops->ucode->get_data_size(ucode, api_ver);
        init_size = priv->cfg->ops->ucode->get_init_size(ucode, api_ver);
        init_data_size =
                priv->cfg->ops->ucode->get_init_data_size(ucode, api_ver);
        boot_size = priv->cfg->ops->ucode->get_boot_size(ucode, api_ver);
        src = priv->cfg->ops->ucode->get_data(ucode, api_ver);

        /* 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 */

        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);

        IWL_INFO(priv, "loaded firmware version %u.%u.%u.%u\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));

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

        if (build)
                IWL_DEBUG_INFO(priv, "Build %u\n", build);

        eeprom_ver = iwl_eeprom_query16(priv, EEPROM_VERSION);
        IWL_DEBUG_INFO(priv, "NVM Type: %s, version: 0x%x\n",
                       (priv->nvm_device_type == NVM_DEVICE_TYPE_OTP)
                       ? "OTP" : "EEPROM", eeprom_ver);

        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 = %u\n",
                       inst_size);
        IWL_DEBUG_INFO(priv, "f/w package hdr runtime data size = %u\n",
                       data_size);
        IWL_DEBUG_INFO(priv, "f/w package hdr init inst size = %u\n",
                       init_size);
        IWL_DEBUG_INFO(priv, "f/w package hdr init data size = %u\n",
                       init_data_size);
        IWL_DEBUG_INFO(priv, "f/w package hdr boot inst size = %u\n",
                       boot_size);

        /*
         * 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.
         */

        /* Verify size of file vs. image size info in file's header */
        if (ucode_raw->size !=
                priv->cfg->ops->ucode->get_header_size(api_ver) +
                inst_size + data_size + init_size +
                init_data_size + boot_size) {

                IWL_DEBUG_INFO(priv,
                        "uCode file size %d does not match expected size\n",
                        (int)ucode_raw->size);
                goto try_again;
        }

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

        if (data_size > priv->hw_params.max_data_size) {
                IWL_DEBUG_INFO(priv, "uCode data len %d too large to fit in\n",
                                data_size);
                goto try_again;
        }
        if (init_size > priv->hw_params.max_inst_size) {
                IWL_INFO(priv, "uCode init instr len %d too large to fit in\n",
                        init_size);
                goto try_again;
        }
        if (init_data_size > priv->hw_params.max_data_size) {
                IWL_INFO(priv, "uCode init data len %d too large to fit in\n",
                      init_data_size);
                goto try_again;
        }
        if (boot_size > priv->hw_params.max_bsm_size) {
                IWL_INFO(priv, "uCode boot instr len %d too large to fit in\n",
                        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 = inst_size;
        iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_code);

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

        priv->ucode_data_backup.len = 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 (init_size && init_data_size) {
                priv->ucode_init.len = init_size;
                iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_init);

                priv->ucode_init_data.len = 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 (boot_size) {
                priv->ucode_boot.len = boot_size;
                iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_boot);

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

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

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

        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 (2nd block)
         * NOTE:  Copy into backup buffer will be done in iwl_up()  */
        len = data_size;
        IWL_DEBUG_INFO(priv, "Copying (but not loading) uCode data len %Zd\n", len);
        memcpy(priv->ucode_data.v_addr, src, len);
        memcpy(priv->ucode_data_backup.v_addr, src, len);
        src += len;

        /* Initialization instructions (3rd block) */
        if (init_size) {
                len = init_size;
                IWL_DEBUG_INFO(priv, "Copying (but not loading) init instr len %Zd\n",
                                len);
                memcpy(priv->ucode_init.v_addr, src, len);
                src += len;
        }

        /* Initialization data (4th block) */
        if (init_data_size) {
                len = init_data_size;
                IWL_DEBUG_INFO(priv, "Copying (but not loading) init data len %Zd\n",
                               len);
                memcpy(priv->ucode_init_data.v_addr, src, len);
                src += len;
        }

        /* Bootstrap instructions (5th block) */
        len = boot_size;
        IWL_DEBUG_INFO(priv, "Copying (but not loading) boot instr len %Zd\n", len);
        memcpy(priv->ucode_boot.v_addr, src, len);

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

        /* We have our copies now, allow OS release its copies */
        release_firmware(ucode_raw);
        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:
        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",
        "ADVANCED SYSASSERT"
};

static const char *desc_lookup(int i)
{
        int max = ARRAY_SIZE(desc_lookup_text) - 1;

        if (i < 0 || i > max)
                i = max;

        return desc_lookup_text[i];
}

#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;

        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.error_event_table_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));
        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));

        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 (#%02d) %010u 0x%08X 0x%08X %u\n",
                desc_lookup(desc), desc, time, data1, data2, line);
        IWL_ERR(priv, "blink1  blink2  ilink1  ilink2\n");
        IWL_ERR(priv, "0x%05X 0x%05X 0x%05X 0x%05X\n", blink1, blink2,
                ilink1, ilink2);

}

#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);
        else
                base = le32_to_cpu(priv->card_alive.log_event_table_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;
}

/* For sanity check only.  Actual size is determined by uCode, typ. 512 */
#define MAX_EVENT_LOG_SIZE (512)

#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 */
        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);
        else
                base = le32_to_cpu(priv->card_alive.log_event_table_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 > MAX_EVENT_LOG_SIZE) {
                IWL_ERR(priv, "Log capacity %d is bogus, limit to %d entries\n",
                        capacity, MAX_EVENT_LOG_SIZE);
                capacity = MAX_EVENT_LOG_SIZE;
        }

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

        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;
        }

#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;
}

/**
 * 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;

        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;
        }

        iwl_clear_stations_table(priv);
        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);

        if (iwl_is_rfkill(priv))
                return;

        ieee80211_wake_queues(priv->hw);

        priv->active_rate = priv->rates_mask;
        priv->active_rate_basic = priv->rates_mask & IWL_BASIC_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(priv)) {
                struct iwl_rxon_cmd *active_rxon =
                                (struct iwl_rxon_cmd *)&priv->active_rxon;
                /* apply any changes in staging */
                priv->staging_rxon.filter_flags |= RXON_FILTER_ASSOC_MSK;
                active_rxon->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
        } else {
                /* Initialize our rx_config data */
                iwl_connection_init_rx_config(priv, priv->iw_mode);

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

                memcpy(priv->staging_rxon.node_addr, priv->mac_addr, ETH_ALEN);
        }

        /* Configure Bluetooth device coexistence support */
        iwl_send_bt_config(priv);

        iwl_reset_run_time_calib(priv);

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

        /* 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");
        set_bit(STATUS_READY, &priv->status);
        wake_up_interruptible(&priv->wait_command_queue);

        iwl_power_update_mode(priv, true);

        /* reassociate for ADHOC mode */
        if (priv->vif && (priv->iw_mode == NL80211_IFTYPE_ADHOC)) {
                struct sk_buff *beacon = ieee80211_beacon_get(priv->hw,
                                                                priv->vif);
                if (beacon)
                        iwl_mac_beacon_update(priv->hw, beacon);
        }


        if (test_and_clear_bit(STATUS_MODE_PENDING, &priv->status))
                iwl_set_mode(priv, priv->iw_mode);

        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");

        if (!exit_pending)
                set_bit(STATUS_EXIT_PENDING, &priv->status);

        iwl_clear_stations_table(priv);

        /* 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 */
        iwl_disable_ict(priv);

        iwl_txq_ctx_stop(priv);
        iwl_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 */
        priv->cfg->ops->lib->apm_ops.stop(priv);

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

        if (priv->ibss_beacon)
                dev_kfree_skb(priv->ibss_beacon);
        priv->ibss_beacon = 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)
{
        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;
        }

        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);

        ret = iwl_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++) {

                iwl_clear_stations_table(priv);

                /* 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");

                return 0;
        }

        set_bit(STATUS_EXIT_PENDING, &priv->status);
        __iwl_down(priv);
        clear_bit(STATUS_EXIT_PENDING, &priv->status);

        /* tried to restart and config the device for as long as our
         * patience could withstand */
        IWL_ERR(priv, "Unable to initialize device after %d attempts.\n", i);
        return -EIO;
}


/*****************************************************************************
 *
 * Workqueue callbacks
 *
 *****************************************************************************/

static void iwl_bg_init_alive_start(struct work_struct *data)
{
        struct iwl_priv *priv =
            container_of(data, struct iwl_priv, init_alive_start.work);

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

        mutex_lock(&priv->mutex);
        priv->cfg->ops->lib->init_alive_start(priv);
        mutex_unlock(&priv->mutex);
}

static void iwl_bg_alive_start(struct work_struct *data)
{
        struct iwl_priv *priv =
            container_of(data, struct iwl_priv, alive_start.work);

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

        /* enable dram interrupt */
        iwl_reset_ict(priv);

        mutex_lock(&priv->mutex);
        iwl_alive_start(priv);
        mutex_unlock(&priv->mutex);
}

static void iwl_bg_run_time_calib_work(struct work_struct *work)
{
        struct iwl_priv *priv = container_of(work, struct iwl_priv,
                        run_time_calib_work);

        mutex_lock(&priv->mutex);

        if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
            test_bit(STATUS_SCANNING, &priv->status)) {
                mutex_unlock(&priv->mutex);
                return;
        }

        if (priv->start_calib) {
                iwl_chain_noise_calibration(priv, &priv->statistics);

                iwl_sensitivity_calibration(priv, &priv->statistics);
        }

        mutex_unlock(&priv->mutex);
        return;
}

static void iwl_bg_restart(struct work_struct *data)
{
        struct iwl_priv *priv = container_of(data, struct iwl_priv, restart);

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

        if (test_and_clear_bit(STATUS_FW_ERROR, &priv->status)) {
                mutex_lock(&priv->mutex);
                priv->vif = NULL;
                priv->is_open = 0;
                mutex_unlock(&priv->mutex);
                iwl_down(priv);
                ieee80211_restart_hw(priv->hw);
        } else {
                iwl_down(priv);

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

                mutex_lock(&priv->mutex);
                __iwl_up(priv);
                mutex_unlock(&priv->mutex);
        }
}

static void iwl_bg_rx_replenish(struct work_struct *data)
{
        struct iwl_priv *priv =
            container_of(data, struct iwl_priv, rx_replenish);

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

        mutex_lock(&priv->mutex);
        iwl_rx_replenish(priv);
        mutex_unlock(&priv->mutex);
}

#define IWL_DELAY_NEXT_SCAN (HZ*2)

void iwl_post_associate(struct iwl_priv *priv)
{
        struct ieee80211_conf *conf = NULL;
        int ret = 0;
        unsigned long flags;

        if (priv->iw_mode == NL80211_IFTYPE_AP) {
                IWL_ERR(priv, "%s Should not be called in AP mode\n", __func__);
                return;
        }

        IWL_DEBUG_ASSOC(priv, "Associated as %d to: %pM\n",
                        priv->assoc_id, priv->active_rxon.bssid_addr);


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


        if (!priv->vif || !priv->is_open)
                return;

        iwl_scan_cancel_timeout(priv, 200);

        conf = ieee80211_get_hw_conf(priv->hw);

        priv->staging_rxon.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
        iwlcore_commit_rxon(priv);

        iwl_setup_rxon_timing(priv);
        ret = iwl_send_cmd_pdu(priv, REPLY_RXON_TIMING,
                              sizeof(priv->rxon_timing), &priv->rxon_timing);
        if (ret)
                IWL_WARN(priv, "REPLY_RXON_TIMING failed - "
                            "Attempting to continue.\n");

        priv->staging_rxon.filter_flags |= RXON_FILTER_ASSOC_MSK;

        iwl_set_rxon_ht(priv, &priv->current_ht_config);

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

        priv->staging_rxon.assoc_id = cpu_to_le16(priv->assoc_id);

        IWL_DEBUG_ASSOC(priv, "assoc id %d beacon interval %d\n",
                        priv->assoc_id, priv->beacon_int);

        if (priv->assoc_capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
                priv->staging_rxon.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
        else
                priv->staging_rxon.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;

        if (priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK) {
                if (priv->assoc_capability & WLAN_CAPABILITY_SHORT_SLOT_TIME)
                        priv->staging_rxon.flags |= RXON_FLG_SHORT_SLOT_MSK;
                else
                        priv->staging_rxon.flags &= ~RXON_FLG_SHORT_SLOT_MSK;

                if (priv->iw_mode == NL80211_IFTYPE_ADHOC)
                        priv->staging_rxon.flags &= ~RXON_FLG_SHORT_SLOT_MSK;

        }

        iwlcore_commit_rxon(priv);

        switch (priv->iw_mode) {
        case NL80211_IFTYPE_STATION:
                break;

        case NL80211_IFTYPE_ADHOC:

                /* assume default assoc id */
                priv->assoc_id = 1;

                iwl_rxon_add_station(priv, priv->bssid, 0);
                iwl_send_beacon_cmd(priv);

                break;

        default:
                IWL_ERR(priv, "%s Should not be called in %d mode\n",
                          __func__, priv->iw_mode);
                break;
        }

        if (priv->iw_mode == NL80211_IFTYPE_ADHOC)
                priv->assoc_station_added = 1;

        spin_lock_irqsave(&priv->lock, flags);
        iwl_activate_qos(priv, 0);
        spin_unlock_irqrestore(&priv->lock, flags);

        /* the chain noise calibration will enabled PM upon completion
         * If chain noise has already been run, then we need to enable
         * power management here */
        if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
                iwl_power_update_mode(priv, false);

        /* Enable Rx differential gain and sensitivity calibrations */
        iwl_chain_noise_reset(priv);
        priv->start_calib = 1;

}

/*****************************************************************************
 *
 * mac80211 entry point functions
 *
 *****************************************************************************/

#define UCODE_READY_TIMEOUT     (4 * HZ)

/*
 * Not a mac80211 entry point function, but it fits in with all the
 * other mac80211 functions grouped here.
 */
static int iwl_mac_setup_register(struct iwl_priv *priv)
{
        int ret;
        struct ieee80211_hw *hw = priv->hw;
        hw->rate_control_algorithm = "iwl-agn-rs";

        /* Tell mac80211 our characteristics */
        hw->flags = IEEE80211_HW_SIGNAL_DBM |
                    IEEE80211_HW_NOISE_DBM |
                    IEEE80211_HW_AMPDU_AGGREGATION |
                    IEEE80211_HW_SPECTRUM_MGMT;

        if (!priv->cfg->broken_powersave)
                hw->flags |= IEEE80211_HW_SUPPORTS_PS |
                             IEEE80211_HW_SUPPORTS_DYNAMIC_PS;

        if (priv->cfg->sku & IWL_SKU_N)
                hw->flags |= IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS |
                             IEEE80211_HW_SUPPORTS_STATIC_SMPS;

        hw->sta_data_size = sizeof(struct iwl_station_priv);
        hw->wiphy->interface_modes =
                BIT(NL80211_IFTYPE_STATION) |
                BIT(NL80211_IFTYPE_ADHOC);

        hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY |
                            WIPHY_FLAG_DISABLE_BEACON_HINTS;

        /*
         * For now, disable PS by default because it affects
         * RX performance significantly.
         */
        hw->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;

        hw->wiphy->max_scan_ssids = PROBE_OPTION_MAX;
        /* we create the 802.11 header and a zero-length SSID element */
        hw->wiphy->max_scan_ie_len = IWL_MAX_PROBE_REQUEST - 24 - 2;

        /* Default value; 4 EDCA QOS priorities */
        hw->queues = 4;

        hw->max_listen_interval = IWL_CONN_MAX_LISTEN_INTERVAL;

        if (priv->bands[IEEE80211_BAND_2GHZ].n_channels)
                priv->hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
                        &priv->bands[IEEE80211_BAND_2GHZ];
        if (priv->bands[IEEE80211_BAND_5GHZ].n_channels)
                priv->hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
                        &priv->bands[IEEE80211_BAND_5GHZ];

        ret = ieee80211_register_hw(priv->hw);
        if (ret) {
                IWL_ERR(priv, "Failed to register hw (error %d)\n", ret);
                return ret;
        }
        priv->mac80211_registered = 1;

        return 0;
}


static int iwl_mac_start(struct ieee80211_hw *hw)
{
        struct iwl_priv *priv = hw->priv;
        int ret;

        IWL_DEBUG_MAC80211(priv, "enter\n");

        /* we should be verifying the device is ready to be opened */
        mutex_lock(&priv->mutex);
        ret = __iwl_up(priv);
        mutex_unlock(&priv->mutex);

        if (ret)
                return ret;

        if (iwl_is_rfkill(priv))
                goto out;

        IWL_DEBUG_INFO(priv, "Start UP work done.\n");

        /* Wait for START_ALIVE from Run Time ucode. Otherwise callbacks from
         * mac80211 will not be run successfully. */
        ret = wait_event_interruptible_timeout(priv->wait_command_queue,
                        test_bit(STATUS_READY, &priv->status),
                        UCODE_READY_TIMEOUT);
        if (!ret) {
                if (!test_bit(STATUS_READY, &priv->status)) {
                        IWL_ERR(priv, "START_ALIVE timeout after %dms.\n",
                                jiffies_to_msecs(UCODE_READY_TIMEOUT));
                        return -ETIMEDOUT;
                }
        }

        iwl_led_start(priv);

out:
        priv->is_open = 1;
        IWL_DEBUG_MAC80211(priv, "leave\n");
        return 0;
}

static void iwl_mac_stop(struct ieee80211_hw *hw)
{
        struct iwl_priv *priv = hw->priv;

        IWL_DEBUG_MAC80211(priv, "enter\n");

        if (!priv->is_open)
                return;

        priv->is_open = 0;

        if (iwl_is_ready_rf(priv) || test_bit(STATUS_SCAN_HW, &priv->status)) {
                /* stop mac, cancel any scan request and clear
                 * RXON_FILTER_ASSOC_MSK BIT
                 */
                mutex_lock(&priv->mutex);
                iwl_scan_cancel_timeout(priv, 100);
                mutex_unlock(&priv->mutex);
        }

        iwl_down(priv);

        flush_workqueue(priv->workqueue);

        /* enable interrupts again in order to receive rfkill changes */
        iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
        iwl_enable_interrupts(priv);

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

static int iwl_mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
        struct iwl_priv *priv = hw->priv;

        IWL_DEBUG_MACDUMP(priv, "enter\n");

        IWL_DEBUG_TX(priv, "dev->xmit(%d bytes) at rate 0x%02x\n", skb->len,
                     ieee80211_get_tx_rate(hw, IEEE80211_SKB_CB(skb))->bitrate);

        if (iwl_tx_skb(priv, skb))
                dev_kfree_skb_any(skb);

        IWL_DEBUG_MACDUMP(priv, "leave\n");
        return NETDEV_TX_OK;
}

void iwl_config_ap(struct iwl_priv *priv)
{
        int ret = 0;
        unsigned long flags;

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

        /* The following should be done only at AP bring up */
        if (!iwl_is_associated(priv)) {

                /* RXON - unassoc (to set timing command) */
                priv->staging_rxon.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
                iwlcore_commit_rxon(priv);

                /* RXON Timing */
                iwl_setup_rxon_timing(priv);
                ret = iwl_send_cmd_pdu(priv, REPLY_RXON_TIMING,
                                sizeof(priv->rxon_timing), &priv->rxon_timing);
                if (ret)
                        IWL_WARN(priv, "REPLY_RXON_TIMING failed - "
                                        "Attempting to continue.\n");

                /* AP has all antennas */
                priv->chain_noise_data.active_chains =
                        priv->hw_params.valid_rx_ant;
                iwl_set_rxon_ht(priv, &priv->current_ht_config);
                if (priv->cfg->ops->hcmd->set_rxon_chain)
                        priv->cfg->ops->hcmd->set_rxon_chain(priv);

                /* FIXME: what should be the assoc_id for AP? */
                priv->staging_rxon.assoc_id = cpu_to_le16(priv->assoc_id);
                if (priv->assoc_capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
                        priv->staging_rxon.flags |=
                                RXON_FLG_SHORT_PREAMBLE_MSK;
                else
                        priv->staging_rxon.flags &=
                                ~RXON_FLG_SHORT_PREAMBLE_MSK;

                if (priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK) {
                        if (priv->assoc_capability &
                                WLAN_CAPABILITY_SHORT_SLOT_TIME)
                                priv->staging_rxon.flags |=
                                        RXON_FLG_SHORT_SLOT_MSK;
                        else
                                priv->staging_rxon.flags &=
                                        ~RXON_FLG_SHORT_SLOT_MSK;

                        if (priv->iw_mode == NL80211_IFTYPE_ADHOC)
                                priv->staging_rxon.flags &=
                                        ~RXON_FLG_SHORT_SLOT_MSK;
                }
                /* restore RXON assoc */
                priv->staging_rxon.filter_flags |= RXON_FILTER_ASSOC_MSK;
                iwlcore_commit_rxon(priv);
                iwl_reset_qos(priv);
                spin_lock_irqsave(&priv->lock, flags);
                iwl_activate_qos(priv, 1);
                spin_unlock_irqrestore(&priv->lock, flags);
                iwl_add_bcast_station(priv);
        }
        iwl_send_beacon_cmd(priv);

        /* FIXME - we need to add code here to detect a totally new
         * configuration, reset the AP, unassoc, rxon timing, assoc,
         * clear sta table, add BCAST sta... */
}

static void iwl_mac_update_tkip_key(struct ieee80211_hw *hw,
                                    struct ieee80211_vif *vif,
                                    struct ieee80211_key_conf *keyconf,
                                    struct ieee80211_sta *sta,
                                    u32 iv32, u16 *phase1key)
{

        struct iwl_priv *priv = hw->priv;
        IWL_DEBUG_MAC80211(priv, "enter\n");

        iwl_update_tkip_key(priv, keyconf,
                            sta ? sta->addr : iwl_bcast_addr,
                            iv32, phase1key);

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

static int iwl_mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                           struct ieee80211_vif *vif,
                           struct ieee80211_sta *sta,
                           struct ieee80211_key_conf *key)
{
        struct iwl_priv *priv = hw->priv;
        const u8 *addr;
        int ret;
        u8 sta_id;
        bool is_default_wep_key = false;

        IWL_DEBUG_MAC80211(priv, "enter\n");

        if (priv->cfg->mod_params->sw_crypto) {
                IWL_DEBUG_MAC80211(priv, "leave - hwcrypto disabled\n");
                return -EOPNOTSUPP;
        }
        addr = sta ? sta->addr : iwl_bcast_addr;
        sta_id = iwl_find_station(priv, addr);
        if (sta_id == IWL_INVALID_STATION) {
                IWL_DEBUG_MAC80211(priv, "leave - %pM not in station map.\n",
                                   addr);
                return -EINVAL;

        }

        mutex_lock(&priv->mutex);
        iwl_scan_cancel_timeout(priv, 100);
        mutex_unlock(&priv->mutex);

        /* If we are getting WEP group key and we didn't receive any key mapping
         * so far, we are in legacy wep mode (group key only), otherwise we are
         * in 1X mode.
         * In legacy wep mode, we use another host command to the uCode */
        if (key->alg == ALG_WEP && sta_id == priv->hw_params.bcast_sta_id &&
                priv->iw_mode != NL80211_IFTYPE_AP) {
                if (cmd == SET_KEY)
                        is_default_wep_key = !priv->key_mapping_key;
                else
                        is_default_wep_key =
                                        (key->hw_key_idx == HW_KEY_DEFAULT);
        }

        switch (cmd) {
        case SET_KEY:
                if (is_default_wep_key)
                        ret = iwl_set_default_wep_key(priv, key);
                else
                        ret = iwl_set_dynamic_key(priv, key, sta_id);

                IWL_DEBUG_MAC80211(priv, "enable hwcrypto key\n");
                break;
        case DISABLE_KEY:
                if (is_default_wep_key)
                        ret = iwl_remove_default_wep_key(priv, key);
                else
                        ret = iwl_remove_dynamic_key(priv, key, sta_id);

                IWL_DEBUG_MAC80211(priv, "disable hwcrypto key\n");
                break;
        default:
                ret = -EINVAL;
        }

        IWL_DEBUG_MAC80211(priv, "leave\n");

        return ret;
}

static int iwl_mac_ampdu_action(struct ieee80211_hw *hw,
                                struct ieee80211_vif *vif,
                             enum ieee80211_ampdu_mlme_action action,
                             struct ieee80211_sta *sta, u16 tid, u16 *ssn)
{
        struct iwl_priv *priv = hw->priv;
        int ret;

        IWL_DEBUG_HT(priv, "A-MPDU action on addr %pM tid %d\n",
                     sta->addr, tid);

        if (!(priv->cfg->sku & IWL_SKU_N))
                return -EACCES;

        switch (action) {
        case IEEE80211_AMPDU_RX_START:
                IWL_DEBUG_HT(priv, "start Rx\n");
                return iwl_sta_rx_agg_start(priv, sta->addr, tid, *ssn);
        case IEEE80211_AMPDU_RX_STOP:
                IWL_DEBUG_HT(priv, "stop Rx\n");
                ret = iwl_sta_rx_agg_stop(priv, sta->addr, tid);
                if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                        return 0;
                else
                        return ret;
        case IEEE80211_AMPDU_TX_START:
                IWL_DEBUG_HT(priv, "start Tx\n");
                return iwl_tx_agg_start(priv, sta->addr, tid, ssn);
        case IEEE80211_AMPDU_TX_STOP:
                IWL_DEBUG_HT(priv, "stop Tx\n");
                ret = iwl_tx_agg_stop(priv, sta->addr, tid);
                if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                        return 0;
                else
                        return ret;
        case IEEE80211_AMPDU_TX_OPERATIONAL:
                /* do nothing */
                return -EOPNOTSUPP;
        default:
                IWL_DEBUG_HT(priv, "unknown\n");
                return -EINVAL;
                break;
        }
        return 0;
}

static int iwl_mac_get_stats(struct ieee80211_hw *hw,
                             struct ieee80211_low_level_stats *stats)
{
        struct iwl_priv *priv = hw->priv;

        priv = hw->priv;
        IWL_DEBUG_MAC80211(priv, "enter\n");
        IWL_DEBUG_MAC80211(priv, "leave\n");

        return 0;
}

static void iwl_mac_sta_notify(struct ieee80211_hw *hw,
                               struct ieee80211_vif *vif,
                               enum sta_notify_cmd cmd,
                               struct ieee80211_sta *sta)
{
        struct iwl_priv *priv = hw->priv;
        struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
        int sta_id;