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iwl3945-base.c

/******************************************************************************
 *
 * Copyright(c) 2003 - 2009 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/dma-mapping.h>
#include <linux/delay.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/ieee80211_radiotap.h>
#include <net/lib80211.h>
#include <net/mac80211.h>

#include <asm/div64.h>

#define DRV_NAME  "iwl3945"

#include "iwl-fh.h"
#include "iwl-3945-fh.h"
#include "iwl-commands.h"
#include "iwl-sta.h"
#include "iwl-3945.h"
#include "iwl-helpers.h"
#include "iwl-core.h"
#include "iwl-dev.h"

/*
 * module name, copyright, version, etc.
 */

#define DRV_DESCRIPTION \
"Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux"

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

#ifdef CONFIG_IWL3945_SPECTRUM_MEASUREMENT
#define VS "s"
#else
#define VS
#endif

#define IWL39_VERSION "1.2.26k" VD VS
#define DRV_COPYRIGHT   "Copyright(c) 2003-2009 Intel Corporation"
#define DRV_AUTHOR     "<ilw@linux.intel.com>"
#define DRV_VERSION     IWL39_VERSION


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

 /* module parameters */
struct iwl_mod_params iwl3945_mod_params = {
      .num_of_queues = IWL39_MAX_NUM_QUEUES,
      .sw_crypto = 1,
      .restart_fw = 1,
      /* the rest are 0 by default */
};

/**
 * iwl3945_get_antenna_flags - Get antenna flags for RXON command
 * @priv: eeprom and antenna fields are used to determine antenna flags
 *
 * priv->eeprom39  is used to determine if antenna AUX/MAIN are reversed
 * iwl3945_mod_params.antenna specifies the antenna diversity mode:
 *
 * IWL_ANTENNA_DIVERSITY - NIC selects best antenna by itself
 * IWL_ANTENNA_MAIN      - Force MAIN antenna
 * IWL_ANTENNA_AUX       - Force AUX antenna
 */
__le32 iwl3945_get_antenna_flags(const struct iwl_priv *priv)
{
      struct iwl3945_eeprom *eeprom = (struct iwl3945_eeprom *)priv->eeprom;

      switch (iwl3945_mod_params.antenna) {
      case IWL_ANTENNA_DIVERSITY:
            return 0;

      case IWL_ANTENNA_MAIN:
            if (eeprom->antenna_switch_type)
                  return RXON_FLG_DIS_DIV_MSK | RXON_FLG_ANT_B_MSK;
            return RXON_FLG_DIS_DIV_MSK | RXON_FLG_ANT_A_MSK;

      case IWL_ANTENNA_AUX:
            if (eeprom->antenna_switch_type)
                  return RXON_FLG_DIS_DIV_MSK | RXON_FLG_ANT_A_MSK;
            return RXON_FLG_DIS_DIV_MSK | RXON_FLG_ANT_B_MSK;
      }

      /* bad antenna selector value */
      IWL_ERR(priv, "Bad antenna selector value (0x%x)\n",
            iwl3945_mod_params.antenna);

      return 0;         /* "diversity" is default if error */
}

static int iwl3945_set_ccmp_dynamic_key_info(struct iwl_priv *priv,
                           struct ieee80211_key_conf *keyconf,
                           u8 sta_id)
{
      unsigned long flags;
      __le16 key_flags = 0;
      int ret;

      key_flags |= (STA_KEY_FLG_CCMP | STA_KEY_FLG_MAP_KEY_MSK);
      key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);

      if (sta_id == priv->hw_params.bcast_sta_id)
            key_flags |= STA_KEY_MULTICAST_MSK;

      keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
      keyconf->hw_key_idx = keyconf->keyidx;
      key_flags &= ~STA_KEY_FLG_INVALID;

      spin_lock_irqsave(&priv->sta_lock, flags);
      priv->stations[sta_id].keyinfo.alg = keyconf->alg;
      priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
      memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key,
             keyconf->keylen);

      memcpy(priv->stations[sta_id].sta.key.key, keyconf->key,
             keyconf->keylen);

      if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
                  == STA_KEY_FLG_NO_ENC)
            priv->stations[sta_id].sta.key.key_offset =
                         iwl_get_free_ucode_key_index(priv);
      /* else, we are overriding an existing key => no need to allocated room
      * in uCode. */

      WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
            "no space for a new key");

      priv->stations[sta_id].sta.key.key_flags = key_flags;
      priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
      priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;

      IWL_DEBUG_INFO(priv, "hwcrypto: modify ucode station key info\n");

      ret = iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);

      spin_unlock_irqrestore(&priv->sta_lock, flags);

      return ret;
}

static int iwl3945_set_tkip_dynamic_key_info(struct iwl_priv *priv,
                          struct ieee80211_key_conf *keyconf,
                          u8 sta_id)
{
      return -EOPNOTSUPP;
}

static int iwl3945_set_wep_dynamic_key_info(struct iwl_priv *priv,
                          struct ieee80211_key_conf *keyconf,
                          u8 sta_id)
{
      return -EOPNOTSUPP;
}

static int iwl3945_clear_sta_key_info(struct iwl_priv *priv, u8 sta_id)
{
      unsigned long flags;

      spin_lock_irqsave(&priv->sta_lock, flags);
      memset(&priv->stations[sta_id].keyinfo, 0, sizeof(struct iwl_hw_key));
      memset(&priv->stations[sta_id].sta.key, 0,
            sizeof(struct iwl4965_keyinfo));
      priv->stations[sta_id].sta.key.key_flags = STA_KEY_FLG_NO_ENC;
      priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
      priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
      spin_unlock_irqrestore(&priv->sta_lock, flags);

      IWL_DEBUG_INFO(priv, "hwcrypto: clear ucode station key info\n");
      iwl_send_add_sta(priv, &priv->stations[sta_id].sta, 0);
      return 0;
}

static int iwl3945_set_dynamic_key(struct iwl_priv *priv,
                  struct ieee80211_key_conf *keyconf, u8 sta_id)
{
      int ret = 0;

      keyconf->hw_key_idx = HW_KEY_DYNAMIC;

      switch (keyconf->alg) {
      case ALG_CCMP:
            ret = iwl3945_set_ccmp_dynamic_key_info(priv, keyconf, sta_id);
            break;
      case ALG_TKIP:
            ret = iwl3945_set_tkip_dynamic_key_info(priv, keyconf, sta_id);
            break;
      case ALG_WEP:
            ret = iwl3945_set_wep_dynamic_key_info(priv, keyconf, sta_id);
            break;
      default:
            IWL_ERR(priv, "Unknown alg: %s alg = %d\n", __func__, keyconf->alg);
            ret = -EINVAL;
      }

      IWL_DEBUG_WEP(priv, "Set dynamic key: alg= %d len=%d idx=%d sta=%d ret=%d\n",
                  keyconf->alg, keyconf->keylen, keyconf->keyidx,
                  sta_id, ret);

      return ret;
}

static int iwl3945_remove_static_key(struct iwl_priv *priv)
{
      int ret = -EOPNOTSUPP;

      return ret;
}

static int iwl3945_set_static_key(struct iwl_priv *priv,
                        struct ieee80211_key_conf *key)
{
      if (key->alg == ALG_WEP)
            return -EOPNOTSUPP;

      IWL_ERR(priv, "Static key invalid: alg %d\n", key->alg);
      return -EINVAL;
}

static void iwl3945_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 iwl3945_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 iwl3945_frame *iwl3945_get_free_frame(struct iwl_priv *priv)
{
      struct iwl3945_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 iwl3945_frame, list);
}

static void iwl3945_free_frame(struct iwl_priv *priv, struct iwl3945_frame *frame)
{
      memset(frame, 0, sizeof(*frame));
      list_add(&frame->list, &priv->free_frames);
}

unsigned int iwl3945_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;
}

static int iwl3945_send_beacon_cmd(struct iwl_priv *priv)
{
      struct iwl3945_frame *frame;
      unsigned int frame_size;
      int rc;
      u8 rate;

      frame = iwl3945_get_free_frame(priv);

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

      rate = iwl_rate_get_lowest_plcp(priv);

      frame_size = iwl3945_hw_get_beacon_cmd(priv, frame, rate);

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

      iwl3945_free_frame(priv, frame);

      return rc;
}

static void iwl3945_unset_hw_params(struct iwl_priv *priv)
{
      if (priv->shared_virt)
            pci_free_consistent(priv->pci_dev,
                            sizeof(struct iwl3945_shared),
                            priv->shared_virt,
                            priv->shared_phys);
}

#define MAX_UCODE_BEACON_INTERVAL   1024
#define INTEL_CONN_LISTEN_INTERVAL  cpu_to_le16(0xA)

static __le16 iwl3945_adjust_beacon_interval(u16 beacon_val)
{
      u16 new_val = 0;
      u16 beacon_factor = 0;

      beacon_factor =
          (beacon_val + MAX_UCODE_BEACON_INTERVAL)
            / MAX_UCODE_BEACON_INTERVAL;
      new_val = beacon_val / beacon_factor;

      return cpu_to_le16(new_val);
}

static void iwl3945_setup_rxon_timing(struct iwl_priv *priv)
{
      u64 interval_tm_unit;
      u64 tsf, result;
      unsigned long flags;
      struct ieee80211_conf *conf = NULL;
      u16 beacon_int = 0;

      conf = ieee80211_get_hw_conf(priv->hw);

      spin_lock_irqsave(&priv->lock, flags);
      priv->rxon_timing.timestamp = cpu_to_le64(priv->timestamp);
      priv->rxon_timing.listen_interval = INTEL_CONN_LISTEN_INTERVAL;

      tsf = priv->timestamp;

      beacon_int = priv->beacon_int;
      spin_unlock_irqrestore(&priv->lock, flags);

      if (priv->iw_mode == NL80211_IFTYPE_STATION) {
            if (beacon_int == 0) {
                  priv->rxon_timing.beacon_interval = cpu_to_le16(100);
                  priv->rxon_timing.beacon_init_val = cpu_to_le32(102400);
            } else {
                  priv->rxon_timing.beacon_interval =
                        cpu_to_le16(beacon_int);
                  priv->rxon_timing.beacon_interval =
                      iwl3945_adjust_beacon_interval(
                        le16_to_cpu(priv->rxon_timing.beacon_interval));
            }

            priv->rxon_timing.atim_window = 0;
      } else {
            priv->rxon_timing.beacon_interval =
                  iwl3945_adjust_beacon_interval(
                        priv->vif->bss_conf.beacon_int);
            /* TODO: we need to get atim_window from upper stack
             * for now we set to 0 */
            priv->rxon_timing.atim_window = 0;
      }

      interval_tm_unit =
            (le16_to_cpu(priv->rxon_timing.beacon_interval) * 1024);
      result = do_div(tsf, interval_tm_unit);
      priv->rxon_timing.beacon_init_val =
          cpu_to_le32((u32) ((u64) interval_tm_unit - result));

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

static void iwl3945_build_tx_cmd_hwcrypto(struct iwl_priv *priv,
                              struct ieee80211_tx_info *info,
                              struct iwl_cmd *cmd,
                              struct sk_buff *skb_frag,
                              int sta_id)
{
      struct iwl3945_tx_cmd *tx = (struct iwl3945_tx_cmd *)cmd->cmd.payload;
      struct iwl_hw_key *keyinfo = &priv->stations[sta_id].keyinfo;

      switch (keyinfo->alg) {
      case ALG_CCMP:
            tx->sec_ctl = TX_CMD_SEC_CCM;
            memcpy(tx->key, keyinfo->key, keyinfo->keylen);
            IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
            break;

      case ALG_TKIP:
            break;

      case ALG_WEP:
            tx->sec_ctl = TX_CMD_SEC_WEP |
                (info->control.hw_key->hw_key_idx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT;

            if (keyinfo->keylen == 13)
                  tx->sec_ctl |= TX_CMD_SEC_KEY128;

            memcpy(&tx->key[3], keyinfo->key, keyinfo->keylen);

            IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
                       "with key %d\n", info->control.hw_key->hw_key_idx);
            break;

      default:
            IWL_ERR(priv, "Unknown encode alg %d\n", keyinfo->alg);
            break;
      }
}

/*
 * handle build REPLY_TX command notification.
 */
static void iwl3945_build_tx_cmd_basic(struct iwl_priv *priv,
                          struct iwl_cmd *cmd,
                          struct ieee80211_tx_info *info,
                          struct ieee80211_hdr *hdr, u8 std_id)
{
      struct iwl3945_tx_cmd *tx = (struct iwl3945_tx_cmd *)cmd->cmd.payload;
      __le32 tx_flags = tx->tx_flags;
      __le16 fc = hdr->frame_control;
      u8 rc_flags = info->control.rates[0].flags;

      tx->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
      if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
            tx_flags |= TX_CMD_FLG_ACK_MSK;
            if (ieee80211_is_mgmt(fc))
                  tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
            if (ieee80211_is_probe_resp(fc) &&
                !(le16_to_cpu(hdr->seq_ctrl) & 0xf))
                  tx_flags |= TX_CMD_FLG_TSF_MSK;
      } else {
            tx_flags &= (~TX_CMD_FLG_ACK_MSK);
            tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
      }

      tx->sta_id = std_id;
      if (ieee80211_has_morefrags(fc))
            tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;

      if (ieee80211_is_data_qos(fc)) {
            u8 *qc = ieee80211_get_qos_ctl(hdr);
            tx->tid_tspec = qc[0] & 0xf;
            tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
      } else {
            tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
      }

      if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
            tx_flags |= TX_CMD_FLG_RTS_MSK;
            tx_flags &= ~TX_CMD_FLG_CTS_MSK;
      } else if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
            tx_flags &= ~TX_CMD_FLG_RTS_MSK;
            tx_flags |= TX_CMD_FLG_CTS_MSK;
      }

      if ((tx_flags & TX_CMD_FLG_RTS_MSK) || (tx_flags & TX_CMD_FLG_CTS_MSK))
            tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;

      tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
      if (ieee80211_is_mgmt(fc)) {
            if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
                  tx->timeout.pm_frame_timeout = cpu_to_le16(3);
            else
                  tx->timeout.pm_frame_timeout = cpu_to_le16(2);
      } else {
            tx->timeout.pm_frame_timeout = 0;
#ifdef CONFIG_IWLWIFI_LEDS
            priv->rxtxpackets += le16_to_cpu(cmd->cmd.tx.len);
#endif
      }

      tx->driver_txop = 0;
      tx->tx_flags = tx_flags;
      tx->next_frame_len = 0;
}

/*
 * start REPLY_TX command process
 */
static int iwl3945_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
{
      struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
      struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
      struct iwl3945_tx_cmd *tx;
      struct iwl_tx_queue *txq = NULL;
      struct iwl_queue *q = NULL;
      struct iwl_cmd *out_cmd = NULL;
      dma_addr_t phys_addr;
      dma_addr_t txcmd_phys;
      int txq_id = skb_get_queue_mapping(skb);
      u16 len, idx, len_org, hdr_len; /* TODO: len_org is not used */
      u8 id;
      u8 unicast;
      u8 sta_id;
      u8 tid = 0;
      u16 seq_number = 0;
      __le16 fc;
      u8 wait_write_ptr = 0;
      u8 *qc = NULL;
      unsigned long flags;
      int rc;

      spin_lock_irqsave(&priv->lock, flags);
      if (iwl_is_rfkill(priv)) {
            IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
            goto drop_unlock;
      }

      if ((ieee80211_get_tx_rate(priv->hw, info)->hw_value & 0xFF) == IWL_INVALID_RATE) {
            IWL_ERR(priv, "ERROR: No TX rate available.\n");
            goto drop_unlock;
      }

      unicast = !is_multicast_ether_addr(hdr->addr1);
      id = 0;

      fc = hdr->frame_control;

#ifdef CONFIG_IWLWIFI_DEBUG
      if (ieee80211_is_auth(fc))
            IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
      else if (ieee80211_is_assoc_req(fc))
            IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
      else if (ieee80211_is_reassoc_req(fc))
            IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
#endif

      /* drop all data frame if we are not associated */
      if (ieee80211_is_data(fc) &&
          (!iwl_is_monitor_mode(priv)) && /* packet injection */
          (!iwl_is_associated(priv) ||
           ((priv->iw_mode == NL80211_IFTYPE_STATION) && !priv->assoc_id))) {
            IWL_DEBUG_DROP(priv, "Dropping - !iwl_is_associated\n");
            goto drop_unlock;
      }

      spin_unlock_irqrestore(&priv->lock, flags);

      hdr_len = ieee80211_hdrlen(fc);

      /* Find (or create) index into station table for destination station */
      sta_id = iwl_get_sta_id(priv, hdr);
      if (sta_id == IWL_INVALID_STATION) {
            IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
                         hdr->addr1);
            goto drop;
      }

      IWL_DEBUG_RATE(priv, "station Id %d\n", sta_id);

      if (ieee80211_is_data_qos(fc)) {
            qc = ieee80211_get_qos_ctl(hdr);
            tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
            seq_number = priv->stations[sta_id].tid[tid].seq_number &
                        IEEE80211_SCTL_SEQ;
            hdr->seq_ctrl = cpu_to_le16(seq_number) |
                  (hdr->seq_ctrl &
                        cpu_to_le16(IEEE80211_SCTL_FRAG));
            seq_number += 0x10;
      }

      /* Descriptor for chosen Tx queue */
      txq = &priv->txq[txq_id];
      q = &txq->q;

      spin_lock_irqsave(&priv->lock, flags);

      idx = get_cmd_index(q, q->write_ptr, 0);

      /* Set up driver data for this TFD */
      memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info));
      txq->txb[q->write_ptr].skb[0] = skb;

      /* Init first empty entry in queue's array of Tx/cmd buffers */
      out_cmd = txq->cmd[idx];
      tx = (struct iwl3945_tx_cmd *)out_cmd->cmd.payload;
      memset(&out_cmd->hdr, 0, sizeof(out_cmd->hdr));
      memset(tx, 0, sizeof(*tx));

      /*
       * Set up the Tx-command (not MAC!) header.
       * Store the chosen Tx queue and TFD index within the sequence field;
       * after Tx, uCode's Tx response will return this value so driver can
       * locate the frame within the tx queue and do post-tx processing.
       */
      out_cmd->hdr.cmd = REPLY_TX;
      out_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
                        INDEX_TO_SEQ(q->write_ptr)));

      /* Copy MAC header from skb into command buffer */
      memcpy(tx->hdr, hdr, hdr_len);


      if (info->control.hw_key)
            iwl3945_build_tx_cmd_hwcrypto(priv, info, out_cmd, skb, sta_id);

      /* TODO need this for burst mode later on */
      iwl3945_build_tx_cmd_basic(priv, out_cmd, info, hdr, sta_id);

      /* set is_hcca to 0; it probably will never be implemented */
      iwl3945_hw_build_tx_cmd_rate(priv, out_cmd, info, hdr, sta_id, 0);

      /* Total # bytes to be transmitted */
      len = (u16)skb->len;
      tx->len = cpu_to_le16(len);


      tx->tx_flags &= ~TX_CMD_FLG_ANT_A_MSK;
      tx->tx_flags &= ~TX_CMD_FLG_ANT_B_MSK;

      if (!ieee80211_has_morefrags(hdr->frame_control)) {
            txq->need_update = 1;
            if (qc)
                  priv->stations[sta_id].tid[tid].seq_number = seq_number;
      } else {
            wait_write_ptr = 1;
            txq->need_update = 0;
      }

      IWL_DEBUG_TX(priv, "sequence nr = 0X%x \n",
                 le16_to_cpu(out_cmd->hdr.sequence));
      IWL_DEBUG_TX(priv, "tx_flags = 0X%x \n", le32_to_cpu(tx->tx_flags));
      iwl_print_hex_dump(priv, IWL_DL_TX, tx, sizeof(*tx));
      iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx->hdr,
                     ieee80211_hdrlen(fc));

      /*
       * Use the first empty entry in this queue's command buffer array
       * to contain the Tx command and MAC header concatenated together
       * (payload data will be in another buffer).
       * Size of this varies, due to varying MAC header length.
       * If end is not dword aligned, we'll have 2 extra bytes at the end
       * of the MAC header (device reads on dword boundaries).
       * We'll tell device about this padding later.
       */
      len = sizeof(struct iwl3945_tx_cmd) +
                  sizeof(struct iwl_cmd_header) + hdr_len;

      len_org = len;
      len = (len + 3) & ~3;

      if (len_org != len)
            len_org = 1;
      else
            len_org = 0;

      /* Physical address of this Tx command's header (not MAC header!),
       * within command buffer array. */
      txcmd_phys = pci_map_single(priv->pci_dev, &out_cmd->hdr,
                            len, PCI_DMA_TODEVICE);
      /* we do not map meta data ... so we can safely access address to
       * provide to unmap command*/
      pci_unmap_addr_set(&out_cmd->meta, mapping, txcmd_phys);
      pci_unmap_len_set(&out_cmd->meta, len, len);

      /* Add buffer containing Tx command and MAC(!) header to TFD's
       * first entry */
      priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
                                       txcmd_phys, len, 1, 0);


      /* Set up TFD's 2nd entry to point directly to remainder of skb,
       * if any (802.11 null frames have no payload). */
      len = skb->len - hdr_len;
      if (len) {
            phys_addr = pci_map_single(priv->pci_dev, skb->data + hdr_len,
                                 len, PCI_DMA_TODEVICE);
            priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
                                             phys_addr, len,
                                             0, U32_PAD(len));
      }


      /* Tell device the write index *just past* this latest filled TFD */
      q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
      rc = iwl_txq_update_write_ptr(priv, txq);
      spin_unlock_irqrestore(&priv->lock, flags);

      if (rc)
            return rc;

      if ((iwl_queue_space(q) < q->high_mark)
          && priv->mac80211_registered) {
            if (wait_write_ptr) {
                  spin_lock_irqsave(&priv->lock, flags);
                  txq->need_update = 1;
                  iwl_txq_update_write_ptr(priv, txq);
                  spin_unlock_irqrestore(&priv->lock, flags);
            }

            iwl_stop_queue(priv, skb_get_queue_mapping(skb));
      }

      return 0;

drop_unlock:
      spin_unlock_irqrestore(&priv->lock, flags);
drop:
      return -1;
}

#ifdef CONFIG_IWL3945_SPECTRUM_MEASUREMENT

#include "iwl-spectrum.h"

#define BEACON_TIME_MASK_LOW  0x00FFFFFF
#define BEACON_TIME_MASK_HIGH 0xFF000000
#define TIME_UNIT       1024

/*
 * extended beacon time format
 * time in usec will be changed into a 32-bit value in 8:24 format
 * the high 1 byte is the beacon counts
 * the lower 3 bytes is the time in usec within one beacon interval
 */

static u32 iwl3945_usecs_to_beacons(u32 usec, u32 beacon_interval)
{
      u32 quot;
      u32 rem;
      u32 interval = beacon_interval * 1024;

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

      quot = (usec / interval) & (BEACON_TIME_MASK_HIGH >> 24);
      rem = (usec % interval) & BEACON_TIME_MASK_LOW;

      return (quot << 24) + rem;
}

/* base is usually what we get from ucode with each received frame,
 * the same as HW timer counter counting down
 */

static __le32 iwl3945_add_beacon_time(u32 base, u32 addon, u32 beacon_interval)
{
      u32 base_low = base & BEACON_TIME_MASK_LOW;
      u32 addon_low = addon & BEACON_TIME_MASK_LOW;
      u32 interval = beacon_interval * TIME_UNIT;
      u32 res = (base & BEACON_TIME_MASK_HIGH) +
          (addon & BEACON_TIME_MASK_HIGH);

      if (base_low > addon_low)
            res += base_low - addon_low;
      else if (base_low < addon_low) {
            res += interval + base_low - addon_low;
            res += (1 << 24);
      } else
            res += (1 << 24);

      return cpu_to_le32(res);
}

static int iwl3945_get_measurement(struct iwl_priv *priv,
                         struct ieee80211_measurement_params *params,
                         u8 type)
{
      struct iwl_spectrum_cmd spectrum;
      struct iwl_rx_packet *res;
      struct iwl_host_cmd cmd = {
            .id = REPLY_SPECTRUM_MEASUREMENT_CMD,
            .data = (void *)&spectrum,
            .meta.flags = CMD_WANT_SKB,
      };
      u32 add_time = le64_to_cpu(params->start_time);
      int rc;
      int spectrum_resp_status;
      int duration = le16_to_cpu(params->duration);

      if (iwl_is_associated(priv))
            add_time =
                iwl3945_usecs_to_beacons(
                  le64_to_cpu(params->start_time) - priv->last_tsf,
                  le16_to_cpu(priv->rxon_timing.beacon_interval));

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

      spectrum.channel_count = cpu_to_le16(1);
      spectrum.flags =
          RXON_FLG_TSF2HOST_MSK | RXON_FLG_ANT_A_MSK | RXON_FLG_DIS_DIV_MSK;
      spectrum.filter_flags = MEASUREMENT_FILTER_FLAG;
      cmd.len = sizeof(spectrum);
      spectrum.len = cpu_to_le16(cmd.len - sizeof(spectrum.len));

      if (iwl_is_associated(priv))
            spectrum.start_time =
                iwl3945_add_beacon_time(priv->last_beacon_time,
                        add_time,
                        le16_to_cpu(priv->rxon_timing.beacon_interval));
      else
            spectrum.start_time = 0;

      spectrum.channels[0].duration = cpu_to_le32(duration * TIME_UNIT);
      spectrum.channels[0].channel = params->channel;
      spectrum.channels[0].type = type;
      if (priv->active_rxon.flags & RXON_FLG_BAND_24G_MSK)
            spectrum.flags |= RXON_FLG_BAND_24G_MSK |
                RXON_FLG_AUTO_DETECT_MSK | RXON_FLG_TGG_PROTECT_MSK;

      rc = iwl_send_cmd_sync(priv, &cmd);
      if (rc)
            return rc;

      res = (struct iwl_rx_packet *)cmd.meta.u.skb->data;
      if (res->hdr.flags & IWL_CMD_FAILED_MSK) {
            IWL_ERR(priv, "Bad return from REPLY_RX_ON_ASSOC command\n");
            rc = -EIO;
      }

      spectrum_resp_status = le16_to_cpu(res->u.spectrum.status);
      switch (spectrum_resp_status) {
      case 0:           /* Command will be handled */
            if (res->u.spectrum.id != 0xff) {
                  IWL_DEBUG_INFO(priv, "Replaced existing measurement: %d\n",
                                    res->u.spectrum.id);
                  priv->measurement_status &= ~MEASUREMENT_READY;
            }
            priv->measurement_status |= MEASUREMENT_ACTIVE;
            rc = 0;
            break;

      case 1:           /* Command will not be handled */
            rc = -EAGAIN;
            break;
      }

      dev_kfree_skb_any(cmd.meta.u.skb);

      return rc;
}
#endif

static void iwl3945_rx_reply_alive(struct iwl_priv *priv,
                         struct iwl_rx_mem_buffer *rxb)
{
      struct iwl_rx_packet *pkt = (void *)rxb->skb->data;
      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_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;
            iwl3945_disable_events(priv);
      }

      /* 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 iwl3945_rx_reply_add_sta(struct iwl_priv *priv,
                         struct iwl_rx_mem_buffer *rxb)
{
#ifdef CONFIG_IWLWIFI_DEBUG
      struct iwl_rx_packet *pkt = (void *)rxb->skb->data;
#endif

      IWL_DEBUG_RX(priv, "Received REPLY_ADD_STA: 0x%02X\n", pkt->u.status);
      return;
}

static void iwl3945_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);

      iwl3945_send_beacon_cmd(priv);
}

static void iwl3945_rx_beacon_notif(struct iwl_priv *priv,
                        struct iwl_rx_mem_buffer *rxb)
{
#ifdef CONFIG_IWLWIFI_DEBUG
      struct iwl_rx_packet *pkt = (void *)rxb->skb->data;
      struct iwl3945_beacon_notif *beacon = &(pkt->u.beacon_status);
      u8 rate = beacon->beacon_notify_hdr.rate;

      IWL_DEBUG_RX(priv, "beacon status %x retries %d iss %d "
            "tsf %d %d rate %d\n",
            le32_to_cpu(beacon->beacon_notify_hdr.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 iwl3945_rx_card_state_notif(struct iwl_priv *priv,
                            struct iwl_rx_mem_buffer *rxb)
{
      struct iwl_rx_packet *pkt = (void *)rxb->skb->data;
      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\n",
                    (flags & HW_CARD_DISABLED) ? "Kill" : "On",
                    (flags & SW_CARD_DISABLED) ? "Kill" : "On");

      iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
                CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);

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


      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);
}

/**
 * iwl3945_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 iwl3945_setup_rx_handlers(struct iwl_priv *priv)
{
      priv->rx_handlers[REPLY_ALIVE] = iwl3945_rx_reply_alive;
      priv->rx_handlers[REPLY_ADD_STA] = iwl3945_rx_reply_add_sta;
      priv->rx_handlers[REPLY_ERROR] = iwl_rx_reply_error;
      priv->rx_handlers[CHANNEL_SWITCH_NOTIFICATION] = iwl_rx_csa;
      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] = iwl3945_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] = iwl3945_hw_rx_statistics;
      priv->rx_handlers[STATISTICS_NOTIFICATION] = iwl3945_hw_rx_statistics;

      iwl_setup_spectrum_handlers(priv);
      iwl_setup_rx_scan_handlers(priv);
      priv->rx_handlers[CARD_STATE_NOTIFICATION] = iwl3945_rx_card_state_notif;

      /* Set up hardware specific Rx handlers */
      iwl3945_hw_rx_handler_setup(priv);
}

/************************** RX-FUNCTIONS ****************************/
/*
 * Rx theory of operation
 *
 * The host allocates 32 DMA target addresses and passes the host address
 * to the firmware at register IWL_RFDS_TABLE_LOWER + N * RFD_SIZE where N is
 * 0 to 31
 *
 * Rx Queue Indexes
 * The host/firmware share two index registers for managing the Rx buffers.
 *
 * The READ index maps to the first position that the firmware may be writing
 * to -- the driver can read up to (but not including) this position and get
 * good data.
 * The READ index is managed by the firmware once the card is enabled.
 *
 * The WRITE index maps to the last position the driver has read from -- the
 * position preceding WRITE is the last slot the firmware can place a packet.
 *
 * The queue is empty (no good data) if WRITE = READ - 1, and is full if
 * WRITE = READ.
 *
 * During initialization, the host sets up the READ queue position to the first
 * INDEX position, and WRITE to the last (READ - 1 wrapped)
 *
 * When the firmware places a packet in a buffer, it will advance the READ index
 * and fire the RX interrupt.  The driver can then query the READ index and
 * process as many packets as possible, moving the WRITE index forward as it
 * resets the Rx queue buffers with new memory.
 *
 * The management in the driver is as follows:
 * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
 *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
 *   to replenish the iwl->rxq->rx_free.
 * + In iwl3945_rx_replenish (scheduled) if 'processed' != 'read' then the
 *   iwl->rxq is replenished and the READ INDEX is updated (updating the
 *   'processed' and 'read' driver indexes as well)
 * + A received packet is processed and handed to the kernel network stack,
 *   detached from the iwl->rxq.  The driver 'processed' index is updated.
 * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
 *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
 *   INDEX is not incremented and iwl->status(RX_STALLED) is set.  If there
 *   were enough free buffers and RX_STALLED is set it is cleared.
 *
 *
 * Driver sequence:
 *
 * iwl3945_rx_replenish()     Replenishes rx_free list from rx_used, and calls
 *                            iwl3945_rx_queue_restock
 * iwl3945_rx_queue_restock() Moves available buffers from rx_free into Rx
 *                            queue, updates firmware pointers, and updates
 *                            the WRITE index.  If insufficient rx_free buffers
 *                            are available, schedules iwl3945_rx_replenish
 *
 * -- enable interrupts --
 * ISR - iwl3945_rx()         Detach iwl_rx_mem_buffers from pool up to the
 *                            READ INDEX, detaching the SKB from the pool.
 *                            Moves the packet buffer from queue to rx_used.
 *                            Calls iwl3945_rx_queue_restock to refill any empty
 *                            slots.
 * ...
 *
 */

/**
 * iwl3945_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
 */
static inline __le32 iwl3945_dma_addr2rbd_ptr(struct iwl_priv *priv,
                                dma_addr_t dma_addr)
{
      return cpu_to_le32((u32)dma_addr);
}

/**
 * iwl3945_rx_queue_restock - refill RX queue from pre-allocated pool
 *
 * If there are slots in the RX queue that need to be restocked,
 * and we have free pre-allocated buffers, fill the ranks as much
 * as we can, pulling from rx_free.
 *
 * This moves the 'write' index forward to catch up with 'processed', and
 * also updates the memory address in the firmware to reference the new
 * target buffer.
 */
static int iwl3945_rx_queue_restock(struct iwl_priv *priv)
{
      struct iwl_rx_queue *rxq = &priv->rxq;
      struct list_head *element;
      struct iwl_rx_mem_buffer *rxb;
      unsigned long flags;
      int write, rc;

      spin_lock_irqsave(&rxq->lock, flags);
      write = rxq->write & ~0x7;
      while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
            /* Get next free Rx buffer, remove from free list */
            element = rxq->rx_free.next;
            rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
            list_del(element);

            /* Point to Rx buffer via next RBD in circular buffer */
            rxq->bd[rxq->write] = iwl3945_dma_addr2rbd_ptr(priv, rxb->real_dma_addr);
            rxq->queue[rxq->write] = rxb;
            rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
            rxq->free_count--;
      }
      spin_unlock_irqrestore(&rxq->lock, flags);
      /* If the pre-allocated buffer pool is dropping low, schedule to
       * refill it */
      if (rxq->free_count <= RX_LOW_WATERMARK)
            queue_work(priv->workqueue, &priv->rx_replenish);


      /* If we've added more space for the firmware to place data, tell it.
       * Increment device's write pointer in multiples of 8. */
      if ((rxq->write_actual != (rxq->write & ~0x7))
          || (abs(rxq->write - rxq->read) > 7)) {
            spin_lock_irqsave(&rxq->lock, flags);
            rxq->need_update = 1;
            spin_unlock_irqrestore(&rxq->lock, flags);
            rc = iwl_rx_queue_update_write_ptr(priv, rxq);
            if (rc)
                  return rc;
      }

      return 0;
}

/**
 * iwl3945_rx_replenish - Move all used packet from rx_used to rx_free
 *
 * When moving to rx_free an SKB is allocated for the slot.
 *
 * Also restock the Rx queue via iwl3945_rx_queue_restock.
 * This is called as a scheduled work item (except for during initialization)
 */
static void iwl3945_rx_allocate(struct iwl_priv *priv, gfp_t priority)
{
      struct iwl_rx_queue *rxq = &priv->rxq;
      struct list_head *element;
      struct iwl_rx_mem_buffer *rxb;
      unsigned long flags;

      while (1) {
            spin_lock_irqsave(&rxq->lock, flags);

            if (list_empty(&rxq->rx_used)) {
                  spin_unlock_irqrestore(&rxq->lock, flags);
                  return;
            }

            element = rxq->rx_used.next;
            rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
            list_del(element);
            spin_unlock_irqrestore(&rxq->lock, flags);

            /* Alloc a new receive buffer */
            rxb->skb =
                alloc_skb(priv->hw_params.rx_buf_size,
                        priority);
            if (!rxb->skb) {
                  if (net_ratelimit())
                        IWL_CRIT(priv, ": Can not allocate SKB buffers\n");
                  /* We don't reschedule replenish work here -- we will
                   * call the restock method and if it still needs
                   * more buffers it will schedule replenish */
                  break;
            }

            /* If radiotap head is required, reserve some headroom here.
             * The physical head count is a variable rx_stats->phy_count.
             * We reserve 4 bytes here. Plus these extra bytes, the
             * headroom of the physical head should be enough for the
             * radiotap head that iwl3945 supported. See iwl3945_rt.
             */
            skb_reserve(rxb->skb, 4);

            /* Get physical address of RB/SKB */
            rxb->real_dma_addr = pci_map_single(priv->pci_dev,
                                    rxb->skb->data,
                                    priv->hw_params.rx_buf_size,
                                    PCI_DMA_FROMDEVICE);

            spin_lock_irqsave(&rxq->lock, flags);
            list_add_tail(&rxb->list, &rxq->rx_free);
            priv->alloc_rxb_skb++;
            rxq->free_count++;
            spin_unlock_irqrestore(&rxq->lock, flags);
      }
}

void iwl3945_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
{
      unsigned long flags;
      int i;
      spin_lock_irqsave(&rxq->lock, flags);
      INIT_LIST_HEAD(&rxq->rx_free);
      INIT_LIST_HEAD(&rxq->rx_used);
      /* Fill the rx_used queue with _all_ of the Rx buffers */
      for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
            /* In the reset function, these buffers may have been allocated
             * to an SKB, so we need to unmap and free potential storage */
            if (rxq->pool[i].skb != NULL) {
                  pci_unmap_single(priv->pci_dev,
                               rxq->pool[i].real_dma_addr,
                               priv->hw_params.rx_buf_size,
                               PCI_DMA_FROMDEVICE);
                  priv->alloc_rxb_skb--;
                  dev_kfree_skb(rxq->pool[i].skb);
                  rxq->pool[i].skb = NULL;
            }
            list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
      }

      /* Set us so that we have processed and used all buffers, but have
       * not restocked the Rx queue with fresh buffers */
      rxq->read = rxq->write = 0;
      rxq->free_count = 0;
      rxq->write_actual = 0;
      spin_unlock_irqrestore(&rxq->lock, flags);
}

void iwl3945_rx_replenish(void *data)
{
      struct iwl_priv *priv = data;
      unsigned long flags;

      iwl3945_rx_allocate(priv, GFP_KERNEL);

      spin_lock_irqsave(&priv->lock, flags);
      iwl3945_rx_queue_restock(priv);
      spin_unlock_irqrestore(&priv->lock, flags);
}

static void iwl3945_rx_replenish_now(struct iwl_priv *priv)
{
      iwl3945_rx_allocate(priv, GFP_ATOMIC);

      iwl3945_rx_queue_restock(priv);
}


/* Assumes that the skb field of the buffers in 'pool' is kept accurate.
 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
 * This free routine walks the list of POOL entries and if SKB is set to
 * non NULL it is unmapped and freed
 */
static void iwl3945_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
{
      int i;
      for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
            if (rxq->pool[i].skb != NULL) {
                  pci_unmap_single(priv->pci_dev,
                               rxq->pool[i].real_dma_addr,
                               priv->hw_params.rx_buf_size,
                               PCI_DMA_FROMDEVICE);
                  dev_kfree_skb(rxq->pool[i].skb);
            }
      }

      pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
                      rxq->dma_addr);
      pci_free_consistent(priv->pci_dev, sizeof(struct iwl_rb_status),
                      rxq->rb_stts, rxq->rb_stts_dma);
      rxq->bd = NULL;
      rxq->rb_stts  = NULL;
}


/* Convert linear signal-to-noise ratio into dB */
static u8 ratio2dB[100] = {
/*     0   1   2   3   4   5   6   7   8   9 */
       0,  0,  6, 10, 12, 14, 16, 17, 18, 19, /* 00 - 09 */
      20, 21, 22, 22, 23, 23, 24, 25, 26, 26, /* 10 - 19 */
      26, 26, 26, 27, 27, 28, 28, 28, 29, 29, /* 20 - 29 */
      29, 30, 30, 30, 31, 31, 31, 31, 32, 32, /* 30 - 39 */
      32, 32, 32, 33, 33, 33, 33, 33, 34, 34, /* 40 - 49 */
      34, 34, 34, 34, 35, 35, 35, 35, 35, 35, /* 50 - 59 */
      36, 36, 36, 36, 36, 36, 36, 37, 37, 37, /* 60 - 69 */
      37, 37, 37, 37, 37, 38, 38, 38, 38, 38, /* 70 - 79 */
      38, 38, 38, 38, 38, 39, 39, 39, 39, 39, /* 80 - 89 */
      39, 39, 39, 39, 39, 40, 40, 40, 40, 40  /* 90 - 99 */
};

/* Calculates a relative dB value from a ratio of linear
 *   (i.e. not dB) signal levels.
 * Conversion assumes that levels are voltages (20*log), not powers (10*log). */
int iwl3945_calc_db_from_ratio(int sig_ratio)
{
      /* 1000:1 or higher just report as 60 dB */
      if (sig_ratio >= 1000)
            return 60;

      /* 100:1 or higher, divide by 10 and use table,
       *   add 20 dB to make up for divide by 10 */
      if (sig_ratio >= 100)
            return 20 + (int)ratio2dB[sig_ratio/10];

      /* We shouldn't see this */
      if (sig_ratio < 1)
            return 0;

      /* Use table for ratios 1:1 - 99:1 */
      return (int)ratio2dB[sig_ratio];
}

#define PERFECT_RSSI (-20) /* dBm */
#define WORST_RSSI (-95)   /* dBm */
#define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)

/* Calculate an indication of rx signal quality (a percentage, not dBm!).
 * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
 *   about formulas used below. */
int iwl3945_calc_sig_qual(int rssi_dbm, int noise_dbm)
{
      int sig_qual;
      int degradation = PERFECT_RSSI - rssi_dbm;

      /* If we get a noise measurement, use signal-to-noise ratio (SNR)
       * as indicator; formula is (signal dbm - noise dbm).
       * SNR at or above 40 is a great signal (100%).
       * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
       * Weakest usable signal is usually 10 - 15 dB SNR. */
      if (noise_dbm) {
            if (rssi_dbm - noise_dbm >= 40)
                  return 100;
            else if (rssi_dbm < noise_dbm)
                  return 0;
            sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;

      /* Else use just the signal level.
       * This formula is a least squares fit of data points collected and
       *   compared with a reference system that had a percentage (%) display
       *   for signal quality. */
      } else
            sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
                      (15 * RSSI_RANGE + 62 * degradation)) /
                     (RSSI_RANGE * RSSI_RANGE);

      if (sig_qual > 100)
            sig_qual = 100;
      else if (sig_qual < 1)
            sig_qual = 0;

      return sig_qual;
}

/**
 * iwl3945_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.
 */
static void iwl3945_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 = 0;

      /* 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;

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

      if (total_empty > (RX_QUEUE_SIZE / 2))
            fill_rx = 1;
      /* Rx interrupt, but nothing sent from uCode */
      if (i == r)
            IWL_DEBUG(priv, IWL_DL_RX | IWL_DL_ISR, "r = %d, i = %d\n", r, i);

      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_single(priv->pci_dev, rxb->real_dma_addr,
                        priv->hw_params.rx_buf_size,
                        PCI_DMA_FROMDEVICE);
            pkt = (struct iwl_rx_packet *)rxb->skb->data;

            /* 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 != 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 iwl3945_setup_rx_handlers() */
            if (priv->rx_handlers[pkt->hdr.cmd]) {
                  IWL_DEBUG(priv, IWL_DL_HCMD | IWL_DL_RX | IWL_DL_ISR,
                        "r = %d, i = %d, %s, 0x%02x\n", r, i,
                        get_cmd_string(pkt->hdr.cmd), pkt->hdr.cmd);
                  priv->rx_handlers[pkt->hdr.cmd] (priv, rxb);
                  priv->isr_stats.rx_handlers[pkt->hdr.cmd]++;
            } else {
                  /* No handling needed */
                  IWL_DEBUG(priv, IWL_DL_HCMD | IWL_DL_RX | IWL_DL_ISR,
                        "r %d i %d No handler needed for %s, 0x%02x\n",
                        r, i, get_cmd_string(pkt->hdr.cmd),
                        pkt->hdr.cmd);
            }

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

            /* For now we just don't re-use anything.  We can tweak this
             * later to try and re-use notification packets and SKBs that
             * fail to Rx correctly */
            if (rxb->skb != NULL) {
                  priv->alloc_rxb_skb--;
                  dev_kfree_skb_any(rxb->skb);
                  rxb->skb = NULL;
            }

            spin_lock_irqsave(&rxq->lock, flags);
            list_add_tail(&rxb->list, &priv->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 won't assert. */
            if (fill_rx) {
                  count++;
                  if (count >= 8) {
                        priv->rxq.read = i;
                        iwl3945_rx_replenish_now(priv);
                        count = 0;
                  }
            }
      }

      /* Backtrack one entry */
      priv->rxq.read = i;
      if (fill_rx)
            iwl3945_rx_replenish_now(priv);
      else
            iwl3945_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 const char *desc_lookup(int i)
{
      switch (i) {
      case 1:
            return "FAIL";
      case 2:
            return "BAD_PARAM";
      case 3:
            return "BAD_CHECKSUM";
      case 4:
            return "NMI_INTERRUPT";
      case 5:
            return "SYSASSERT";
      case 6:
            return "FATAL_ERROR";
      }

      return "UNKNOWN";
}

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

static void iwl3945_dump_nic_error_log(struct iwl_priv *priv)
{
      u32 i;
      u32 desc, time, count, base, data1;
      u32 blink1, blink2, ilink1, ilink2;

      base = le32_to_cpu(priv->card_alive.error_event_table_ptr);

      if (!iwl3945_hw_valid_rtc_data_addr(base)) {
            IWL_ERR(priv, "Not valid error log pointer 0x%08X\n", base);
            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);
      }

      IWL_ERR(priv, "Desc       Time       asrtPC  blink2 "
              "ilink1  nmiPC   Line\n");
      for (i = ERROR_START_OFFSET;
           i < (count * ERROR_ELEM_SIZE) + ERROR_START_OFFSET;
           i += ERROR_ELEM_SIZE) {
            desc = iwl_read_targ_mem(priv, base + i);
            time =
                iwl_read_targ_mem(priv, base + i + 1 * sizeof(u32));
            blink1 =
                iwl_read_targ_mem(priv, base + i + 2 * sizeof(u32));
            blink2 =
                iwl_read_targ_mem(priv, base + i + 3 * sizeof(u32));
            ilink1 =
                iwl_read_targ_mem(priv, base + i + 4 * sizeof(u32));
            ilink2 =
                iwl_read_targ_mem(priv, base + i + 5 * sizeof(u32));
            data1 =
                iwl_read_targ_mem(priv, base + i + 6 * sizeof(u32));

            IWL_ERR(priv,
                  "%-13s (#%d) %010u 0x%05X 0x%05X 0x%05X 0x%05X %u\n\n",
                  desc_lookup(desc), desc, time, blink1, blink2,
                  ilink1, ilink2, data1);
      }

}

#define EVENT_START_OFFSET  (6 * sizeof(u32))

/**
 * iwl3945_print_event_log - Dump error event log to syslog
 *
 */
static void iwl3945_print_event_log(struct iwl_priv *priv, u32 start_idx,
                        u32 num_events, u32 mode)
{
      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 */

      if (num_events == 0)
            return;

      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);

      /* "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_targ_mem(priv, ptr);
            ptr += sizeof(u32);
            time = iwl_read_targ_mem(priv, ptr);
            ptr += sizeof(u32);
            if (mode == 0) {
                  /* data, ev */
                  IWL_ERR(priv, "0x%08x\t%04u\n", time, ev);
            } else {
                  data = iwl_read_targ_mem(priv, ptr);
                  ptr += sizeof(u32);
                  IWL_ERR(priv, "%010u\t0x%08x\t%04u\n", time, data, ev);
            }
      }
}

static void iwl3945_dump_nic_event_log(struct iwl_priv *priv)
{
      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 */

      base = le32_to_cpu(priv->card_alive.log_event_table_ptr);
      if (!iwl3945_hw_valid_rtc_data_addr(base)) {
            IWL_ERR(priv, "Invalid event log pointer 0x%08X\n", base);
            return;
      }

      /* 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)));

      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;
      }

      IWL_ERR(priv, "Start IWL Event Log Dump: display count %d, wraps %d\n",
              size, num_wraps);

      /* 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)
            iwl3945_print_event_log(priv, next_entry,
                            capacity - next_entry, mode);

      /* (then/else) start at top of log */
      iwl3945_print_event_log(priv, 0, next_entry, mode);

}

static void iwl3945_irq_tasklet(struct iwl_priv *priv)
{
      u32 inta, handled = 0;
      u32 inta_fh;
      unsigned long flags;
#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 (priv->debug_level & 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

      /* 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 & CSR39_FH_INT_RX_MASK)
            inta |= CSR_INT_BIT_FH_RX;
      if (inta_fh & CSR39_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, "Microcode HW 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;

            spin_unlock_irqrestore(&priv->lock, flags);

            return;
      }

#ifdef CONFIG_IWLWIFI_DEBUG
      if (priv->debug_level & (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);

      /* 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);
            iwl_txq_update_write_ptr(priv, &priv->txq[0]);
            iwl_txq_update_write_ptr(priv, &priv->txq[1]);
            iwl_txq_update_write_ptr(priv, &priv->txq[2]);
            iwl_txq_update_write_ptr(priv, &priv->txq[3]);
            iwl_txq_update_write_ptr(priv, &priv->txq[4]);
            iwl_txq_update_write_ptr(priv, &priv->txq[5]);

            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)) {
            iwl3945_rx_handle(priv);
            priv->isr_stats.rx++;
            handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX);
      }

      if (inta & CSR_INT_BIT_FH_TX) {
            IWL_DEBUG_ISR(priv, "Tx interrupt\n");
            priv->isr_stats.tx++;

            iwl_write32(priv, CSR_FH_INT_STATUS, (1 << 6));
            iwl_write_direct32(priv, FH39_TCSR_CREDIT
                              (FH39_SRVC_CHNL), 0x0);
            handled |= CSR_INT_BIT_FH_TX;
      }

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

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

      /* Re-enable all interrupts */
      /* only Re-enable if disabled by irq */
      if (test_bit(STATUS_INT_ENABLED, &priv->status))
            iwl_enable_interrupts(priv);

#ifdef CONFIG_IWLWIFI_DEBUG
      if (priv->debug_level & (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
      spin_unlock_irqrestore(&priv->lock, flags);
}

static int iwl3945_get_channels_for_scan(struct iwl_priv *priv,
                               enum ieee80211_band band,
                             u8 is_active, u8 n_probes,
                             struct iwl3945_scan_channel *scan_ch)
{
      const struct ieee80211_channel *channels = NULL;
      const struct ieee80211_supported_band *sband;
      const struct iwl_channel_info *ch_info;
      u16 passive_dwell = 0;
      u16 active_dwell = 0;
      int added, i;

      sband = iwl_get_hw_mode(priv, band);
      if (!sband)
            return 0;

      channels = sband->channels;

      active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
      passive_dwell = iwl_get_passive_dwell_time(priv, band);

      if (passive_dwell <= active_dwell)
            passive_dwell = active_dwell + 1;

      for (i = 0, added = 0; i < sband->n_channels; i++) {
            if (channels[i].flags & IEEE80211_CHAN_DISABLED)
                  continue;

            scan_ch->channel = channels[i].hw_value;

            ch_info = iwl_get_channel_info(priv, band, scan_ch->channel);
            if (!is_channel_valid(ch_info)) {
                  IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
                               scan_ch->channel);
                  continue;
            }

            scan_ch->active_dwell = cpu_to_le16(active_dwell);
            scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
            /* If passive , set up for auto-switch
             *  and use long active_dwell time.
             */
            if (!is_active || is_channel_passive(ch_info) ||
                (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN)) {
                  scan_ch->type = 0;      /* passive */
                  if (IWL_UCODE_API(priv->ucode_ver) == 1)
                        scan_ch->active_dwell = cpu_to_le16(passive_dwell - 1);
            } else {
                  scan_ch->type = 1;      /* active */
            }

            /* Set direct probe bits. These may be used both for active
             * scan channels (probes gets sent right away),
             * or for passive channels (probes get se sent only after
             * hearing clear Rx packet).*/
            if (IWL_UCODE_API(priv->ucode_ver) >= 2) {
                  if (n_probes)
                        scan_ch->type |= IWL39_SCAN_PROBE_MASK(n_probes);
            } else {
                  /* uCode v1 does not allow setting direct probe bits on
                   * passive channel. */
                  if ((scan_ch->type & 1) && n_probes)
                        scan_ch->type |= IWL39_SCAN_PROBE_MASK(n_probes);
            }

            /* Set txpower levels to defaults */
            scan_ch->tpc.dsp_atten = 110;
            /* scan_pwr_info->tpc.dsp_atten; */

            /*scan_pwr_info->tpc.tx_gain; */
            if (band == IEEE80211_BAND_5GHZ)
                  scan_ch->tpc.tx_gain = ((1 << 5) | (3 << 3)) | 3;
            else {
                  scan_ch->tpc.tx_gain = ((1 << 5) | (5 << 3));
                  /* NOTE: if we were doing 6Mb OFDM for scans we'd use
                   * power level:
                   * scan_ch->tpc.tx_gain = ((1 << 5) | (2 << 3)) | 3;
                   */
            }

            IWL_DEBUG_SCAN(priv, "Scanning %d [%s %d]\n",
                         scan_ch->channel,
                         (scan_ch->type & 1) ? "ACTIVE" : "PASSIVE",
                         (scan_ch->type & 1) ?
                         active_dwell : passive_dwell);

            scan_ch++;
            added++;
      }

      IWL_DEBUG_SCAN(priv, "total channels to scan %d \n", added);
      return added;
}

static void iwl3945_init_hw_rates(struct iwl_priv *priv,
                        struct ieee80211_rate *rates)
{
      int i;

      for (i = 0; i < IWL_RATE_COUNT; i++) {
            rates[i].bitrate = iwl3945_rates[i].ieee * 5;
            rates[i].hw_value = i; /* Rate scaling will work on indexes */
            rates[i].hw_value_short = i;
            rates[i].flags = 0;
            if ((i > IWL39_LAST_OFDM_RATE) || (i < IWL_FIRST_OFDM_RATE)) {
                  /*
                   * If CCK != 1M then set short preamble rate flag.
                   */
                  rates[i].flags |= (iwl3945_rates[i].plcp == 10) ?
                        0 : IEEE80211_RATE_SHORT_PREAMBLE;
            }
      }
}

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

static void iwl3945_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);
}

/**
 * iwl3945_verify_inst_full - verify runtime uCode image in card vs. host,
 *     looking at all data.
 */
static int iwl3945_verify_inst_full(struct iwl_priv *priv, __le32 *image, u32 len)
{
      u32 val;
      u32 save_len = len;
      int rc = 0;
      u32 errcnt;

      IWL_DEBUG_INFO(priv, "ucode inst image size is %u\n", len);

      iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR,
                         IWL39_RTC_INST_LOWER_BOUND);

      errcnt = 0;
      for (; len > 0; len -= sizeof(u32), image++) {
            /* read data comes through single port, auto-incr addr */
            /* NOTE: Use the debugless read so we don't flood kernel log
             * if IWL_DL_IO is set */
            val = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
            if (val != le32_to_cpu(*image)) {
                  IWL_ERR(priv, "uCode INST section is invalid at "
                          "offset 0x%x, is 0x%x, s/b 0x%x\n",
                          save_len - len, val, le32_to_cpu(*image));
                  rc = -EIO;
                  errcnt++;
                  if (errcnt >= 20)
                        break;
            }
      }


      if (!errcnt)
            IWL_DEBUG_INFO(priv,
                  "ucode image in INSTRUCTION memory is good\n");

      return rc;
}


/**
 * iwl3945_verify_inst_sparse - verify runtime uCode image in card vs. host,
 *   using sample data 100 bytes apart.  If these sample points are good,
 *   it's a pretty good bet that everything between them is good, too.
 */
static int iwl3945_verify_inst_sparse(struct iwl_priv *priv, __le32 *image, u32 len)
{
      u32 val;
      int rc = 0;
      u32 errcnt = 0;
      u32 i;

      IWL_DEBUG_INFO(priv, "ucode inst image size is %u\n", len);

      for (i = 0; i < len; i += 100, image += 100/sizeof(u32)) {
            /* read data comes through single port, auto-incr addr */
            /* NOTE: Use the debugless read so we don't flood kernel log
             * if IWL_DL_IO is set */
            iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR,
                  i + IWL39_RTC_INST_LOWER_BOUND);
            val = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
            if (val != le32_to_cpu(*image)) {
#if 0 /* Enable this if you want to see details */
                  IWL_ERR(priv, "uCode INST section is invalid at "
                          "offset 0x%x, is 0x%x, s/b 0x%x\n",
                          i, val, *image);
#endif
                  rc = -EIO;
                  errcnt++;
                  if (errcnt >= 3)
                        break;
            }
      }

      return rc;
}


/**
 * iwl3945_verify_ucode - determine which instruction image is in SRAM,
 *    and verify its contents
 */
static int iwl3945_verify_ucode(struct iwl_priv *priv)
{
      __le32 *image;
      u32 len;
      int rc = 0;

      /* Try bootstrap */
      image = (__le32 *)priv->ucode_boot.v_addr;
      len = priv->ucode_boot.len;
      rc = iwl3945_verify_inst_sparse(priv, image, len);
      if (rc == 0) {
            IWL_DEBUG_INFO(priv, "Bootstrap uCode is good in inst SRAM\n");
            return 0;
      }

      /* Try initialize */
      image = (__le32 *)priv->ucode_init.v_addr;
      len = priv->ucode_init.len;
      rc = iwl3945_verify_inst_sparse(priv, image, len);
      if (rc == 0) {
            IWL_DEBUG_INFO(priv, "Initialize uCode is good in inst SRAM\n");
            return 0;
      }

      /* Try runtime/protocol */
      image = (__le32 *)priv->ucode_code.v_addr;
      len = priv->ucode_code.len;
      rc = iwl3945_verify_inst_sparse(priv, image, len);
      if (rc == 0) {
            IWL_DEBUG_INFO(priv, "Runtime uCode is good in inst SRAM\n");
            return 0;
      }

      IWL_ERR(priv, "NO VALID UCODE IMAGE IN INSTRUCTION SRAM!!\n");

      /* Since nothing seems to match, show first several data entries in
       * instruction SRAM, so maybe visual inspection will give a clue.
       * Selection of bootstrap image (vs. other images) is arbitrary. */
      image = (__le32 *)priv->ucode_boot.v_addr;
      len = priv->ucode_boot.len;
      rc = iwl3945_verify_inst_full(priv, image, len);

      return rc;
}

static void iwl3945_nic_start(struct iwl_priv *priv)
{
      /* Remove all resets to allow NIC to operate */
      iwl_write32(priv, CSR_RESET, 0);
}

/**
 * iwl3945_read_ucode - Read uCode images from disk file.
 *
 * Copy into buffers for card to fetch via bus-mastering
 */
static int iwl3945_read_ucode(struct iwl_priv *priv)
{
      struct iwl_ucode *ucode;
      int ret = -EINVAL, index;
      const struct firmware *ucode_raw;
      /* firmware file name contains uCode/driver compatibility version */
      const char *name_pre = priv->cfg->fw_name_pre;
      const unsigned int api_max = priv->cfg->ucode_api_max;
      const unsigned int api_min = priv->cfg->ucode_api_min;
      char buf[25];
      u8 *src;
      size_t len;
      u32 api_ver, inst_size, data_size, init_size, init_data_size, boot_size;

      /* Ask kernel firmware_class module to get the boot firmware off disk.
       * request_firmware() is synchronous, file is in memory on return. */
      for (index = api_max; index >= api_min; index--) {
            sprintf(buf, "%s%u%s", name_pre, index, ".ucode");
            ret = request_firmware(&ucode_raw, buf, &priv->pci_dev->dev);
            if (ret < 0) {
                  IWL_ERR(priv, "%s firmware file req failed: %d\n",
                          buf, ret);
                  if (ret == -ENOENT)
                        continue;
                  else
                        goto error;
            } else {
                  if (index < api_max)
                        IWL_ERR(priv, "Loaded firmware %s, "
                              "which is deprecated. "
                              " Please use API v%u instead.\n",
                                buf, api_max);
                  IWL_DEBUG_INFO(priv, "Got firmware '%s' file "
                               "(%zd bytes) from disk\n",
                               buf, ucode_raw->size);
                  break;
            }
      }

      if (ret < 0)
            goto error;

      /* Make sure that we got at least our header! */
      if (ucode_raw->size < sizeof(*ucode)) {
            IWL_ERR(priv, "File size way too small!\n");
            ret = -EINVAL;
            goto err_release;
      }

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

      priv->ucode_ver = le32_to_cpu(ucode->ver);
      api_ver = IWL_UCODE_API(priv->ucode_ver);
      inst_size = le32_to_cpu(ucode->inst_size);
      data_size = le32_to_cpu(ucode->data_size);
      init_size = le32_to_cpu(ucode->init_size);
      init_data_size = le32_to_cpu(ucode->init_data_size);
      boot_size = le32_to_cpu(ucode->boot_size);

      /* 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);
            priv->ucode_ver = 0;
            ret = -EINVAL;
            goto err_release;
      }
      if (api_ver != api_max)
            IWL_ERR(priv, "Firmware has old API version. Expected %u, "
                    "got %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));

      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);


      /* Verify size of file vs. image size info in file's header */
      if (ucode_raw->size < sizeof(*ucode) +
            inst_size + data_size + init_size +
            init_data_size + boot_size) {

            IWL_DEBUG_INFO(priv, "uCode file size %zd too small\n",
                         ucode_raw->size);
            ret = -EINVAL;
            goto err_release;
      }

      /* Verify that uCode images will fit in card's SRAM */
      if (inst_size > IWL39_MAX_INST_SIZE) {
            IWL_DEBUG_INFO(priv, "uCode instr len %d too large to fit in\n",
                         inst_size);
            ret = -EINVAL;
            goto err_release;
      }

      if (data_size > IWL39_MAX_DATA_SIZE) {
            IWL_DEBUG_INFO(priv, "uCode data len %d too large to fit in\n",
                         data_size);
            ret = -EINVAL;
            goto err_release;
      }
      if (init_size > IWL39_MAX_INST_SIZE) {
            IWL_DEBUG_INFO(priv,
                        "uCode init instr len %d too large to fit in\n",
                        init_size);
            ret = -EINVAL;
            goto err_release;
      }
      if (init_data_size > IWL39_MAX_DATA_SIZE) {
            IWL_DEBUG_INFO(priv,
                        "uCode init data len %d too large to fit in\n",
                        init_data_size);
            ret = -EINVAL;
            goto err_release;
      }
      if (boot_size > IWL39_MAX_BSM_SIZE) {
            IWL_DEBUG_INFO(priv,
                        "uCode boot instr len %d too large to fit in\n",
                        boot_size);
            ret = -EINVAL;
            goto err_release;
      }

      /* 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) */
      src = &ucode->data[0];
      len = priv->ucode_code.len;
      IWL_DEBUG_INFO(priv,
            "Copying (but not loading) uCode instr len %zd\n", len);
      memcpy(priv->ucode_code.v_addr, 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 iwl3945_up()  */
      src = &ucode->data[inst_size];
      len = priv->ucode_data.len;
      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);

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

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

      /* Bootstrap instructions (5th block) */
      src = &ucode->data[inst_size + data_size + init_size + init_data_size];
      len = priv->ucode_boot.len;
      IWL_DEBUG_INFO(priv,
            "Copying (but not loading) boot instr len %zd\n", len);
      memcpy(priv->ucode_boot.v_addr, src, len);

      /* We have our copies now, allow OS release its copies */
      release_firmware(ucode_raw);
      return 0;

 err_pci_alloc:
      IWL_ERR(priv, "failed to allocate pci memory\n");
      ret = -ENOMEM;
      iwl3945_dealloc_ucode_pci(priv);

 err_release:
      release_firmware(ucode_raw);

 error:
      return ret;
}


/**
 * iwl3945_set_ucode_ptrs - Set uCode address location
 *
 * Tell initialization uCode where to find runtime uCode.
 *
 * BSM registers initially contain pointers to initialization uCode.
 * We need to replace them to load runtime uCode inst and data,
 * and to save runtime data when powering down.
 */
static int iwl3945_set_ucode_ptrs(struct iwl_priv *priv)
{
      dma_addr_t pinst;
      dma_addr_t pdata;

      /* bits 31:0 for 3945 */
      pinst = priv->ucode_code.p_addr;
      pdata = priv->ucode_data_backup.p_addr;

      /* Tell bootstrap uCode where to find image to load */
      iwl_write_prph(priv, BSM_DRAM_INST_PTR_REG, pinst);
      iwl_write_prph(priv, BSM_DRAM_DATA_PTR_REG, pdata);
      iwl_write_prph(priv, BSM_DRAM_DATA_BYTECOUNT_REG,
                         priv->ucode_data.len);

      /* Inst byte count must be last to set up, bit 31 signals uCode
       *   that all new ptr/size info is in place */
      iwl_write_prph(priv, BSM_DRAM_INST_BYTECOUNT_REG,
                         priv->ucode_code.len | BSM_DRAM_INST_LOAD);

      IWL_DEBUG_INFO(priv, "Runtime uCode pointers are set.\n");

      return 0;
}

/**
 * iwl3945_init_alive_start - Called after REPLY_ALIVE notification received
 *
 * Called after REPLY_ALIVE notification received from "initialize" uCode.
 *
 * Tell "initialize" uCode to go ahead and load the runtime uCode.
 */
static void iwl3945_init_alive_start(struct iwl_priv *priv)
{
      /* Check alive response for "valid" sign from uCode */
      if (priv->card_alive_init.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, "Initialize Alive failed.\n");
            goto restart;
      }

      /* Bootstrap uCode has loaded initialize uCode ... verify inst image.
       * This is a paranoid check, because we would not have gotten the
       * "initialize" alive if code weren't properly loaded.  */
      if (iwl3945_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 \"initialize\" uCode load.\n");
            goto restart;
      }

      /* Send pointers to protocol/runtime uCode image ... init code will
       * load and launch runtime uCode, which will send us another "Alive"
       * notification. */
      IWL_DEBUG_INFO(priv, "Initialization Alive received.\n");
      if (iwl3945_set_ucode_ptrs(priv)) {
            /* Runtime instruction load won't happen;
             * take it all the way back down so we can try again */
            IWL_DEBUG_INFO(priv, "Couldn't set up uCode pointers.\n");
            goto restart;
      }
      return;

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

/**
 * iwl3945_alive_start - called after REPLY_ALIVE notification received
 *                   from protocol/runtime uCode (initialization uCode's
 *                   Alive gets handled by iwl3945_init_alive_start()).
 */
static void iwl3945_alive_start(struct iwl_priv *priv)
{
      int thermal_spin = 0;
      u32 rfkill;

      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 (iwl3945_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);

      rfkill = iwl_read_prph(priv, APMG_RFKILL_REG);
      IWL_DEBUG_INFO(priv, "RFKILL status: 0x%x\n", rfkill);

      if (rfkill & 0x1) {
            clear_bit(STATUS_RF_KILL_HW, &priv->status);
            /* if RFKILL is not on, then wait for thermal
             * sensor in adapter to kick in */
            while (iwl3945_hw_get_temperature(priv) == 0) {
                  thermal_spin++;
                  udelay(10);
            }

            if (thermal_spin)
                  IWL_DEBUG_INFO(priv, "Thermal calibration took %dus\n",
                               thermal_spin * 10);
      } else
            set_bit(STATUS_RF_KILL_HW, &priv->status);

      /* After the ALIVE response, we can send commands to 3945 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;

      iwl_power_update_mode(priv, false);

      if (iwl_is_associated(priv)) {
            struct iwl3945_rxon_cmd *active_rxon =
                        (struct iwl3945_rxon_cmd *)(&priv->active_rxon);

            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);
      }

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

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

      iwl3945_reg_txpower_periodic(priv);

      iwl3945_led_register(priv);

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

      /* 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 iwl3945_cancel_deferred_work(struct iwl_priv *priv);

static void __iwl3945_down(struct iwl_priv *priv)
{
      unsigned long flags;
      int exit_pending = test_bit(STATUS_EXIT_PENDING, &priv->status);
      struct ieee80211_conf *conf = NULL;

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

      conf = ieee80211_get_hw_conf(priv->hw);

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

      iwl3945_led_unregister(priv);
      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 iwl3945_init() then
       * clear all bits but the RF Kill bits 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;

      priv->cfg->ops->lib->apm_ops.reset(priv);
      spin_lock_irqsave(&priv->lock, flags);
      iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
      spin_unlock_irqrestore(&priv->lock, flags);

      iwl3945_hw_txq_ctx_stop(priv);
      iwl3945_hw_rxq_stop(priv);

      iwl_write_prph(priv, APMG_CLK_DIS_REG,
                        APMG_CLK_VAL_DMA_CLK_RQT);

      udelay(5);

      if (exit_pending)
            priv->cfg->ops->lib->apm_ops.stop(priv);
      else
            priv->cfg->ops->lib->apm_ops.reset(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 */
      iwl3945_clear_free_frames(priv);
}

static void iwl3945_down(struct iwl_priv *priv)
{
      mutex_lock(&priv->mutex);
      __iwl3945_down(priv);
      mutex_unlock(&priv->mutex);

      iwl3945_cancel_deferred_work(priv);
}

#define MAX_HW_RESTARTS 5

static int __iwl3945_up(struct iwl_priv *priv)
{
      int rc, i;

      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 bring up\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);
            IWL_WARN(priv, "Radio disabled by HW RF Kill switch\n");
            return -ENODEV;
      }

      iwl_write32(priv, CSR_INT, 0xFFFFFFFF);

      rc = iwl3945_hw_nic_init(priv);
      if (rc) {
            IWL_ERR(priv, "Unable to int nic\n");
            return rc;
      }

      /* 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);

      /* We return success when we resume from suspend and rf_kill is on. */
      if (test_bit(STATUS_RF_KILL_HW, &priv->status))
            return 0;

      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 */
            priv->cfg->ops->lib->load_ucode(priv);

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

            /* start card; "initialize" will load runtime ucode */
            iwl3945_nic_start(priv);

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

            return 0;
      }

      set_bit(STATUS_EXIT_PENDING, &priv->status);
      __iwl3945_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 iwl3945_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);
      iwl3945_init_alive_start(priv);
      mutex_unlock(&priv->mutex);
}

static void iwl3945_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;

      mutex_lock(&priv->mutex);
      iwl3945_alive_start(priv);
      mutex_unlock(&priv->mutex);
}

static void iwl3945_rfkill_poll(struct work_struct *data)
{
      struct iwl_priv *priv =
          container_of(data, struct iwl_priv, rfkill_poll.work);

      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);

      wiphy_rfkill_set_hw_state(priv->hw->wiphy,
                  test_bit(STATUS_RF_KILL_HW, &priv->status));

      queue_delayed_work(priv->workqueue, &priv->rfkill_poll,
                     round_jiffies_relative(2 * HZ));

}

#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
static void iwl3945_bg_request_scan(struct work_struct *data)
{
      struct iwl_priv *priv =
          container_of(data, struct iwl_priv, request_scan);
      struct iwl_host_cmd cmd = {
            .id = REPLY_SCAN_CMD,
            .len = sizeof(struct iwl3945_scan_cmd),
            .meta.flags = CMD_SIZE_HUGE,
      };
      int rc = 0;
      struct iwl3945_scan_cmd *scan;
      struct ieee80211_conf *conf = NULL;
      u8 n_probes = 0;
      enum ieee80211_band band;
      bool is_active = false;

      conf = ieee80211_get_hw_conf(priv->hw);

      mutex_lock(&priv->mutex);

      cancel_delayed_work(&priv->scan_check);

      if (!iwl_is_ready(priv)) {
            IWL_WARN(priv, "request scan called when driver not ready.\n");
            goto done;
      }

      /* Make sure the scan wasn't canceled before this queued work
       * was given the chance to run... */
      if (!test_bit(STATUS_SCANNING, &priv->status))
            goto done;

      /* This should never be called or scheduled if there is currently
       * a scan active in the hardware. */
      if (test_bit(STATUS_SCAN_HW, &priv->status)) {
            IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests  "
                        "Ignoring second request.\n");
            rc = -EIO;
            goto done;
      }

      if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
            IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
            goto done;
      }

      if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
            IWL_DEBUG_HC(priv,
                  "Scan request while abort pending. Queuing.\n");
            goto done;
      }

      if (iwl_is_rfkill(priv)) {
            IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
            goto done;
      }

      if (!test_bit(STATUS_READY, &priv->status)) {
            IWL_DEBUG_HC(priv,
                  "Scan request while uninitialized. Queuing.\n");
            goto done;
      }

      if (!priv->scan_bands) {
            IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n");
            goto done;
      }

      if (!priv->scan) {
            priv->scan = kmalloc(sizeof(struct iwl3945_scan_cmd) +
                             IWL_MAX_SCAN_SIZE, GFP_KERNEL);
            if (!priv->scan) {
                  rc = -ENOMEM;
                  goto done;
            }
      }
      scan = priv->scan;
      memset(scan, 0, sizeof(struct iwl3945_scan_cmd) + IWL_MAX_SCAN_SIZE);

      scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
      scan->quiet_time = IWL_ACTIVE_QUIET_TIME;

      if (iwl_is_associated(priv)) {
            u16 interval = 0;
            u32 extra;
            u32 suspend_time = 100;
            u32 scan_suspend_time = 100;
            unsigned long flags;

            IWL_DEBUG_INFO(priv, "Scanning while associated...\n");

            spin_lock_irqsave(&priv->lock, flags);
            interval = priv->beacon_int;
            spin_unlock_irqrestore(&priv->lock, flags);

            scan->suspend_time = 0;
            scan->max_out_time = cpu_to_le32(200 * 1024);
            if (!interval)
                  interval = suspend_time;
            /*
             * suspend time format:
             *  0-19: beacon interval in usec (time before exec.)
             * 20-23: 0
             * 24-31: number of beacons (suspend between channels)
             */

            extra = (suspend_time / interval) << 24;
            scan_suspend_time = 0xFF0FFFFF &
                (extra | ((suspend_time % interval) * 1024));

            scan->suspend_time = cpu_to_le32(scan_suspend_time);
            IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
                         scan_suspend_time, interval);
      }

      if (priv->scan_request->n_ssids) {
            int i, p = 0;
            IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
            for (i = 0; i < priv->scan_request->n_ssids; i++) {
                  /* always does wildcard anyway */
                  if (!priv->scan_request->ssids[i].ssid_len)
                        continue;
                  scan->direct_scan[p].id = WLAN_EID_SSID;
                  scan->direct_scan[p].len =
                        priv->scan_request->ssids[i].ssid_len;
                  memcpy(scan->direct_scan[p].ssid,
                         priv->scan_request->ssids[i].ssid,
                         priv->scan_request->ssids[i].ssid_len);
                  n_probes++;
                  p++;
            }
            is_active = true;
      } else
            IWL_DEBUG_SCAN(priv, "Kicking off passive scan.\n");

      /* We don't build a direct scan probe request; the uCode will do
       * that based on the direct_mask added to each channel entry */
      scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
      scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
      scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;

      /* flags + rate selection */

      if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
            scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
            scan->tx_cmd.rate = IWL_RATE_1M_PLCP;
            scan->good_CRC_th = 0;
            band = IEEE80211_BAND_2GHZ;
      } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
            scan->tx_cmd.rate = IWL_RATE_6M_PLCP;
            /*
             * If active scaning is requested but a certain channel
             * is marked passive, we can do active scanning if we
             * detect transmissions.
             */
            scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0;
            band = IEEE80211_BAND_5GHZ;
      } else {
            IWL_WARN(priv, "Invalid scan band count\n");
            goto done;
      }

      scan->tx_cmd.len = cpu_to_le16(
                  iwl_fill_probe_req(priv,
                        (struct ieee80211_mgmt *)scan->data,
                        priv->scan_request->ie,
                        priv->scan_request->ie_len,
                        IWL_MAX_SCAN_SIZE - sizeof(*scan)));

      /* select Rx antennas */
      scan->flags |= iwl3945_get_antenna_flags(priv);

      if (iwl_is_monitor_mode(priv))
            scan->filter_flags = RXON_FILTER_PROMISC_MSK;

      scan->channel_count =
            iwl3945_get_channels_for_scan(priv, band, is_active, n_probes,
                  (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);

      if (scan->channel_count == 0) {
            IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
            goto done;
      }

      cmd.len += le16_to_cpu(scan->tx_cmd.len) +
          scan->channel_count * sizeof(struct iwl3945_scan_channel);
      cmd.data = scan;
      scan->len = cpu_to_le16(cmd.len);

      set_bit(STATUS_SCAN_HW, &priv->status);
      rc = iwl_send_cmd_sync(priv, &cmd);
      if (rc)
            goto done;

      queue_delayed_work(priv->workqueue, &priv->scan_check,
                     IWL_SCAN_CHECK_WATCHDOG);

      mutex_unlock(&priv->mutex);
      return;

 done:
      /* can not perform scan make sure we clear scanning
       * bits from status so next scan request can be performed.
       * if we dont clear scanning status bit here all next scan
       * will fail
      */
      clear_bit(STATUS_SCAN_HW, &priv->status);
      clear_bit(STATUS_SCANNING, &priv->status);

      /* inform mac80211 scan aborted */
      queue_work(priv->workqueue, &priv->scan_completed);
      mutex_unlock(&priv->mutex);
}

static void iwl3945_bg_up(struct work_struct *data)
{
      struct iwl_priv *priv = container_of(data, struct iwl_priv, up);

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

      mutex_lock(&priv->mutex);
      __iwl3945_up(priv);
      mutex_unlock(&priv->mutex);
}

static void iwl3945_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);
            iwl3945_down(priv);
            ieee80211_restart_hw(priv->hw);
      } else {
            iwl3945_down(priv);
            queue_work(priv->workqueue, &priv->up);
      }
}

static void iwl3945_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);
      iwl3945_rx_replenish(priv);
      mutex_unlock(&priv->mutex);
}

#define IWL_DELAY_NEXT_SCAN (HZ*2)

void iwl3945_post_associate(struct iwl_priv *priv)
{
      int rc = 0;
      struct ieee80211_conf *conf = NULL;

      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);

      memset(&priv->rxon_timing, 0, sizeof(struct iwl_rxon_time_cmd));
      iwl3945_setup_rxon_timing(priv);
      rc = iwl_send_cmd_pdu(priv, REPLY_RXON_TIMING,
                        sizeof(priv->rxon_timing), &priv->rxon_timing);
      if (rc)
            IWL_WARN(priv, "REPLY_RXON_TIMING failed - "
                      "Attempting to continue.\n");

      priv->staging_rxon.filter_flags |= RXON_FILTER_ASSOC_MSK;

      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:
            iwl3945_rate_scale_init(priv->hw, IWL_AP_ID);
            break;

      case NL80211_IFTYPE_ADHOC:

            priv->assoc_id = 1;
            iwl_add_station(priv, priv->bssid, 0, CMD_SYNC, NULL);
            iwl3945_sync_sta(priv, IWL_STA_ID,
                         (priv->band == IEEE80211_BAND_5GHZ) ?
                         IWL_RATE_6M_PLCP : IWL_RATE_1M_PLCP,
                         CMD_ASYNC);
            iwl3945_rate_scale_init(priv->hw, IWL_STA_ID);
            iwl3945_send_beacon_cmd(priv);

            break;

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

      iwl_activate_qos(priv, 0);

      /* we have just associated, don't start scan too early */
      priv->next_scan_jiffies = jiffies + IWL_DELAY_NEXT_SCAN;
}

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

#define UCODE_READY_TIMEOUT   (2 * HZ)

static int iwl3945_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);

      /* fetch ucode file from disk, alloc and copy to bus-master buffers ...
       * ucode filename and max sizes are card-specific. */

      if (!priv->ucode_code.len) {
            ret = iwl3945_read_ucode(priv);
            if (ret) {
                  IWL_ERR(priv, "Could not read microcode: %d\n", ret);
                  mutex_unlock(&priv->mutex);
                  goto out_release_irq;
            }
      }

      ret = __iwl3945_up(priv);

      mutex_unlock(&priv->mutex);

      if (ret)
            goto out_release_irq;

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

      /* Wait for START_ALIVE from 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,
                        "Wait for START_ALIVE timeout after %dms.\n",
                        jiffies_to_msecs(UCODE_READY_TIMEOUT));
                  ret = -ETIMEDOUT;
                  goto out_release_irq;
            }
      }

      /* ucode is running and will send rfkill notifications,
       * no need to poll the killswitch state anymore */
      cancel_delayed_work(&priv->rfkill_poll);

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

out_release_irq:
      priv->is_open = 0;
      IWL_DEBUG_MAC80211(priv, "leave - failed\n");
      return ret;
}

static void iwl3945_mac_stop(struct ieee80211_hw *hw)
{
      struct iwl_priv *priv = hw->priv;

      IWL_DEBUG_MAC80211(priv, "enter\n");

      if (!priv->is_open) {
            IWL_DEBUG_MAC80211(priv, "leave - skip\n");
            return;
      }

      priv->is_open = 0;

      if (iwl_is_ready_rf(priv)) {
            /* 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);
      }

      iwl3945_down(priv);

      flush_workqueue(priv->workqueue);

      /* start polling the killswitch state again */
      queue_delayed_work(priv->workqueue, &priv->rfkill_poll,
                     round_jiffies_relative(2 * HZ));

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

static int iwl3945_mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
      struct iwl_priv *priv = hw->priv;

      IWL_DEBUG_MAC80211(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 (iwl3945_tx_skb(priv, skb))
            dev_kfree_skb_any(skb);

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

void iwl3945_config_ap(struct iwl_priv *priv)
{
      int rc = 0;

      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 */
            memset(&priv->rxon_timing, 0, sizeof(struct iwl_rxon_time_cmd));
            iwl3945_setup_rxon_timing(priv);
            rc = iwl_send_cmd_pdu(priv, REPLY_RXON_TIMING,
                              sizeof(priv->rxon_timing),
                              &priv->rxon_timing);
            if (rc)
                  IWL_WARN(priv, "REPLY_RXON_TIMING failed - "
                              "Attempting to continue.\n");

            /* 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_add_station(priv, iwl_bcast_addr, 0, CMD_SYNC, NULL);
      }
      iwl3945_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 int iwl3945_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 = 0;
      u8 sta_id = IWL_INVALID_STATION;
      u8 static_key;

      IWL_DEBUG_MAC80211(priv, "enter\n");

      if (iwl3945_mod_params.sw_crypto) {
            IWL_DEBUG_MAC80211(priv, "leave - hwcrypto disabled\n");
            return -EOPNOTSUPP;
      }

      addr = sta ? sta->addr : iwl_bcast_addr;
      static_key = !iwl_is_associated(priv);

      if (!static_key) {
            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);

      switch (cmd) {
      case SET_KEY:
            if (static_key)
                  ret = iwl3945_set_static_key(priv, key);
            else
                  ret = iwl3945_set_dynamic_key(priv, key, sta_id);
            IWL_DEBUG_MAC80211(priv, "enable hwcrypto key\n");
            break;
      case DISABLE_KEY:
            if (static_key)
                  ret = iwl3945_remove_static_key(priv);
            else
                  ret = iwl3945_clear_sta_key_info(priv, sta_id);
            IWL_DEBUG_MAC80211(priv, "disable hwcrypto key\n");
            break;
      default:
            ret = -EINVAL;
      }

      IWL_DEBUG_MAC80211(priv, "leave\n");

      return ret;
}

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

#ifdef CONFIG_IWLWIFI_DEBUG

/*
 * The following adds a new attribute to the sysfs representation
 * of this device driver (i.e. a new file in /sys/bus/pci/drivers/iwl/)
 * used for controlling the debug level.
 *
 * See the level definitions in iwl for details.
 */
static ssize_t show_debug_level(struct device *d,
                        struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);

      return sprintf(buf, "0x%08X\n", priv->debug_level);
}
static ssize_t store_debug_level(struct device *d,
                        struct device_attribute *attr,
                         const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      unsigned long val;
      int ret;

      ret = strict_strtoul(buf, 0, &val);
      if (ret)
            IWL_INFO(priv, "%s is not in hex or decimal form.\n", buf);
      else
            priv->debug_level = val;

      return strnlen(buf, count);
}

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

#endif /* CONFIG_IWLWIFI_DEBUG */

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

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

      return sprintf(buf, "%d\n", iwl3945_hw_get_temperature(priv));
}

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

static ssize_t show_tx_power(struct device *d,
                       struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      return sprintf(buf, "%d\n", priv->tx_power_user_lmt);
}

static ssize_t store_tx_power(struct device *d,
                        struct device_attribute *attr,
                        const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      char *p = (char *)buf;
      u32 val;

      val = simple_strtoul(p, &p, 10);
      if (p == buf)
            IWL_INFO(priv, ": %s is not in decimal form.\n", buf);
      else
            iwl3945_hw_reg_set_txpower(priv, val);

      return count;
}

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

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

      return sprintf(buf, "0x%04X\n", priv->active_rxon.flags);
}

static ssize_t store_flags(struct device *d,
                     struct device_attribute *attr,
                     const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      u32 flags = simple_strtoul(buf, NULL, 0);

      mutex_lock(&priv->mutex);
      if (le32_to_cpu(priv->staging_rxon.flags) != flags) {
            /* Cancel any currently running scans... */
            if (iwl_scan_cancel_timeout(priv, 100))
                  IWL_WARN(priv, "Could not cancel scan.\n");
            else {
                  IWL_DEBUG_INFO(priv, "Committing rxon.flags = 0x%04X\n",
                               flags);
                  priv->staging_rxon.flags = cpu_to_le32(flags);
                  iwlcore_commit_rxon(priv);
            }
      }
      mutex_unlock(&priv->mutex);

      return count;
}

static DEVICE_ATTR(flags, S_IWUSR | S_IRUGO, show_flags, store_flags);

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

      return sprintf(buf, "0x%04X\n",
            le32_to_cpu(priv->active_rxon.filter_flags));
}

static ssize_t store_filter_flags(struct device *d,
                          struct device_attribute *attr,
                          const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      u32 filter_flags = simple_strtoul(buf, NULL, 0);

      mutex_lock(&priv->mutex);
      if (le32_to_cpu(priv->staging_rxon.filter_flags) != filter_flags) {
            /* Cancel any currently running scans... */
            if (iwl_scan_cancel_timeout(priv, 100))
                  IWL_WARN(priv, "Could not cancel scan.\n");
            else {
                  IWL_DEBUG_INFO(priv, "Committing rxon.filter_flags = "
                               "0x%04X\n", filter_flags);
                  priv->staging_rxon.filter_flags =
                        cpu_to_le32(filter_flags);
                  iwlcore_commit_rxon(priv);
            }
      }
      mutex_unlock(&priv->mutex);

      return count;
}

static DEVICE_ATTR(filter_flags, S_IWUSR | S_IRUGO, show_filter_flags,
               store_filter_flags);

#ifdef CONFIG_IWL3945_SPECTRUM_MEASUREMENT

static ssize_t show_measurement(struct device *d,
                        struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      struct iwl_spectrum_notification measure_report;
      u32 size = sizeof(measure_report), len = 0, ofs = 0;
      u8 *data = (u8 *)&measure_report;
      unsigned long flags;

      spin_lock_irqsave(&priv->lock, flags);
      if (!(priv->measurement_status & MEASUREMENT_READY)) {
            spin_unlock_irqrestore(&priv->lock, flags);
            return 0;
      }
      memcpy(&measure_report, &priv->measure_report, size);
      priv->measurement_status = 0;
      spin_unlock_irqrestore(&priv->lock, flags);

      while (size && (PAGE_SIZE - len)) {
            hex_dump_to_buffer(data + ofs, size, 16, 1, buf + len,
                           PAGE_SIZE - len, 1);
            len = strlen(buf);
            if (PAGE_SIZE - len)
                  buf[len++] = '\n';

            ofs += 16;
            size -= min(size, 16U);
      }

      return len;
}

static ssize_t store_measurement(struct device *d,
                         struct device_attribute *attr,
                         const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      struct ieee80211_measurement_params params = {
            .channel = le16_to_cpu(priv->active_rxon.channel),
            .start_time = cpu_to_le64(priv->last_tsf),
            .duration = cpu_to_le16(1),
      };
      u8 type = IWL_MEASURE_BASIC;
      u8 buffer[32];
      u8 channel;

      if (count) {
            char *p = buffer;
            strncpy(buffer, buf, min(sizeof(buffer), count));
            channel = simple_strtoul(p, NULL, 0);
            if (channel)
                  params.channel = channel;

            p = buffer;
            while (*p && *p != ' ')
                  p++;
            if (*p)
                  type = simple_strtoul(p + 1, NULL, 0);
      }

      IWL_DEBUG_INFO(priv, "Invoking measurement of type %d on "
                   "channel %d (for '%s')\n", type, params.channel, buf);
      iwl3945_get_measurement(priv, &params, type);

      return count;
}

static DEVICE_ATTR(measurement, S_IRUSR | S_IWUSR,
               show_measurement, store_measurement);
#endif /* CONFIG_IWL3945_SPECTRUM_MEASUREMENT */

static ssize_t store_retry_rate(struct device *d,
                        struct device_attribute *attr,
                        const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);

      priv->retry_rate = simple_strtoul(buf, NULL, 0);
      if (priv->retry_rate <= 0)
            priv->retry_rate = 1;

      return count;
}

static ssize_t show_retry_rate(struct device *d,
                         struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      return sprintf(buf, "%d", priv->retry_rate);
}

static DEVICE_ATTR(retry_rate, S_IWUSR | S_IRUSR, show_retry_rate,
               store_retry_rate);


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


      mutex_lock(&priv->mutex);

      ret = strict_strtoul(buf, 10, &mode);
      if (ret)
            goto out;

      ret = iwl_power_set_user_mode(priv, mode);
      if (ret) {
            IWL_DEBUG_MAC80211(priv, "failed setting power mode.\n");
            goto out;
      }
      ret = count;

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

static ssize_t show_power_level(struct device *d,
                        struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      int level = priv->power_data.power_mode;
      char *p = buf;

      p += sprintf(p, "%d\n", level);
      return p - buf + 1;
}

static DEVICE_ATTR(power_level, S_IWUSR | S_IRUSR,
               show_power_level, store_power_level);

#define MAX_WX_STRING 80

/* Values are in microsecond */
static const s32 timeout_duration[] = {
      350000,
      250000,
      75000,
      37000,
      25000,
};
static const s32 period_duration[] = {
      400000,
      700000,
      1000000,
      1000000,
      1000000
};

static ssize_t show_channels(struct device *d,
                       struct device_attribute *attr, char *buf)
{
      /* all this shit doesn't belong into sysfs anyway */
      return 0;
}

static DEVICE_ATTR(channels, S_IRUSR, show_channels, NULL);

static ssize_t show_statistics(struct device *d,
                         struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      u32 size = sizeof(struct iwl3945_notif_statistics);
      u32 len = 0, ofs = 0;
      u8 *data = (u8 *)&priv->statistics_39;
      int rc = 0;

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

      mutex_lock(&priv->mutex);
      rc = iwl_send_statistics_request(priv, 0);
      mutex_unlock(&priv->mutex);

      if (rc) {
            len = sprintf(buf,
                        "Error sending statistics request: 0x%08X\n", rc);
            return len;
      }

      while (size && (PAGE_SIZE - len)) {
            hex_dump_to_buffer(data + ofs, size, 16, 1, buf + len,
                           PAGE_SIZE - len, 1);
            len = strlen(buf);
            if (PAGE_SIZE - len)
                  buf[len++] = '\n';

            ofs += 16;
            size -= min(size, 16U);
      }

      return len;
}

static DEVICE_ATTR(statistics, S_IRUGO, show_statistics, NULL);

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

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

      return sprintf(buf, "%d\n", iwl3945_mod_params.antenna);
}

static ssize_t store_antenna(struct device *d,
                       struct device_attribute *attr,
                       const char *buf, size_t count)
{
      struct iwl_priv *priv __maybe_unused = dev_get_drvdata(d);
      int ant;

      if (count == 0)
            return 0;

      if (sscanf(buf, "%1i", &ant) != 1) {
            IWL_DEBUG_INFO(priv, "not in hex or decimal form.\n");
            return count;
      }

      if ((ant >= 0) && (ant <= 2)) {
            IWL_DEBUG_INFO(priv, "Setting antenna select to %d.\n", ant);
            iwl3945_mod_params.antenna = (enum iwl3945_antenna)ant;
      } else
            IWL_DEBUG_INFO(priv, "Bad antenna select value %d.\n", ant);


      return count;
}

static DEVICE_ATTR(antenna, S_IWUSR | S_IRUGO, show_antenna, store_antenna);

static ssize_t show_status(struct device *d,
                     struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      if (!iwl_is_alive(priv))
            return -EAGAIN;
      return sprintf(buf, "0x%08x\n", (int)priv->status);
}

static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);

static ssize_t dump_error_log(struct device *d,
                        struct device_attribute *attr,
                        const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      char *p = (char *)buf;

      if (p[0] == '1')
            iwl3945_dump_nic_error_log(priv);

      return strnlen(buf, count);
}

static DEVICE_ATTR(dump_errors, S_IWUSR, NULL, dump_error_log);

static ssize_t dump_event_log(struct device *d,
                        struct device_attribute *attr,
                        const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      char *p = (char *)buf;

      if (p[0] == '1')
            iwl3945_dump_nic_event_log(priv);

      return strnlen(buf, count);
}

static DEVICE_ATTR(dump_events, S_IWUSR, NULL, dump_event_log);

/*****************************************************************************
 *
 * driver setup and tear down
 *
 *****************************************************************************/

static void iwl3945_setup_deferred_work(struct iwl_priv *priv)
{
      priv->workqueue = create_singlethread_workqueue(DRV_NAME);

      init_waitqueue_head(&priv->wait_command_queue);

      INIT_WORK(&priv->up, iwl3945_bg_up);
      INIT_WORK(&priv->restart, iwl3945_bg_restart);
      INIT_WORK(&priv->rx_replenish, iwl3945_bg_rx_replenish);
      INIT_WORK(&priv->beacon_update, iwl3945_bg_beacon_update);
      INIT_DELAYED_WORK(&priv->init_alive_start, iwl3945_bg_init_alive_start);
      INIT_DELAYED_WORK(&priv->alive_start, iwl3945_bg_alive_start);
      INIT_DELAYED_WORK(&priv->rfkill_poll, iwl3945_rfkill_poll);
      INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
      INIT_WORK(&priv->request_scan, iwl3945_bg_request_scan);
      INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
      INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);

      iwl3945_hw_setup_deferred_work(priv);

      tasklet_init(&priv->irq_tasklet, (void (*)(unsigned long))
                 iwl3945_irq_tasklet, (unsigned long)priv);
}

static void iwl3945_cancel_deferred_work(struct iwl_priv *priv)
{
      iwl3945_hw_cancel_deferred_work(priv);

      cancel_delayed_work_sync(&priv->init_alive_start);
      cancel_delayed_work(&priv->scan_check);
      cancel_delayed_work(&priv->alive_start);
      cancel_work_sync(&priv->beacon_update);
}

static struct attribute *iwl3945_sysfs_entries[] = {
      &dev_attr_antenna.attr,
      &dev_attr_channels.attr,
      &dev_attr_dump_errors.attr,
      &dev_attr_dump_events.attr,
      &dev_attr_flags.attr,
      &dev_attr_filter_flags.attr,
#ifdef CONFIG_IWL3945_SPECTRUM_MEASUREMENT
      &dev_attr_measurement.attr,
#endif
      &dev_attr_power_level.attr,
      &dev_attr_retry_rate.attr,
      &dev_attr_statistics.attr,
      &dev_attr_status.attr,
      &dev_attr_temperature.attr,
      &dev_attr_tx_power.attr,
#ifdef CONFIG_IWLWIFI_DEBUG
      &dev_attr_debug_level.attr,
#endif
      NULL
};

static struct attribute_group iwl3945_attribute_group = {
      .name = NULL,           /* put in device directory */
      .attrs = iwl3945_sysfs_entries,
};

static struct ieee80211_ops iwl3945_hw_ops = {
      .tx = iwl3945_mac_tx,
      .start = iwl3945_mac_start,
      .stop = iwl3945_mac_stop,
      .add_interface = iwl_mac_add_interface,
      .remove_interface = iwl_mac_remove_interface,
      .config = iwl_mac_config,
      .configure_filter = iwl_configure_filter,
      .set_key = iwl3945_mac_set_key,
      .get_tx_stats = iwl_mac_get_tx_stats,
      .conf_tx = iwl_mac_conf_tx,
      .reset_tsf = iwl_mac_reset_tsf,
      .bss_info_changed = iwl_bss_info_changed,
      .hw_scan = iwl_mac_hw_scan
};

static int iwl3945_init_drv(struct iwl_priv *priv)
{
      int ret;
      struct iwl3945_eeprom *eeprom = (struct iwl3945_eeprom *)priv->eeprom;

      priv->retry_rate = 1;
      priv->ibss_beacon = NULL;

      spin_lock_init(&priv->lock);
      spin_lock_init(&priv->sta_lock);
      spin_lock_init(&priv->hcmd_lock);

      INIT_LIST_HEAD(&priv->free_frames);

      mutex_init(&priv->mutex);

      /* Clear the driver's (not device's) station table */
      iwl_clear_stations_table(priv);

      priv->data_retry_limit = -1;
      priv->ieee_channels = NULL;
      priv->ieee_rates = NULL;
      priv->band = IEEE80211_BAND_2GHZ;

      priv->iw_mode = NL80211_IFTYPE_STATION;

      iwl_reset_qos(priv);

      priv->qos_data.qos_active = 0;
      priv->qos_data.qos_cap.val = 0;

      priv->rates_mask = IWL_RATES_MASK;
      /* If power management is turned on, default to CAM mode */
      priv->power_mode = IWL_POWER_MODE_CAM;
      priv->tx_power_user_lmt = IWL_DEFAULT_TX_POWER;

      if (eeprom->version < EEPROM_3945_EEPROM_VERSION) {
            IWL_WARN(priv, "Unsupported EEPROM version: 0x%04X\n",
                   eeprom->version);
            ret = -EINVAL;
            goto err;
      }
      ret = iwl_init_channel_map(priv);
      if (ret) {
            IWL_ERR(priv, "initializing regulatory failed: %d\n", ret);
            goto err;
      }

      /* Set up txpower settings in driver for all channels */
      if (iwl3945_txpower_set_from_eeprom(priv)) {
            ret = -EIO;
            goto err_free_channel_map;
      }

      ret = iwlcore_init_geos(priv);
      if (ret) {
            IWL_ERR(priv, "initializing geos failed: %d\n", ret);
            goto err_free_channel_map;
      }
      iwl3945_init_hw_rates(priv, priv->ieee_rates);

      return 0;

err_free_channel_map:
      iwl_free_channel_map(priv);
err:
      return ret;
}

static int iwl3945_setup_mac(struct iwl_priv *priv)
{
      int ret;
      struct ieee80211_hw *hw = priv->hw;

      hw->rate_control_algorithm = "iwl-3945-rs";
      hw->sta_data_size = sizeof(struct iwl3945_sta_priv);

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

      hw->wiphy->interface_modes =
            BIT(NL80211_IFTYPE_STATION) |
            BIT(NL80211_IFTYPE_ADHOC);

      hw->wiphy->custom_regulatory = true;

      /* Firmware does not support this */
      hw->wiphy->disable_beacon_hints = true;

      hw->wiphy->max_scan_ssids = PROBE_OPTION_MAX_3945;
      /* 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;

      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 iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
      int err = 0;
      struct iwl_priv *priv;
      struct ieee80211_hw *hw;
      struct iwl_cfg *cfg = (struct iwl_cfg *)(ent->driver_data);
      struct iwl3945_eeprom *eeprom;
      unsigned long flags;

      /***********************
       * 1. Allocating HW data
       * ********************/

      /* mac80211 allocates memory for this device instance, including
       *   space for this driver's private structure */
      hw = iwl_alloc_all(cfg, &iwl3945_hw_ops);
      if (hw == NULL) {
            printk(KERN_ERR DRV_NAME "Can not allocate network device\n");
            err = -ENOMEM;
            goto out;
      }
      priv = hw->priv;
      SET_IEEE80211_DEV(hw, &pdev->dev);

      if ((iwl3945_mod_params.num_of_queues > IWL39_MAX_NUM_QUEUES) ||
           (iwl3945_mod_params.num_of_queues < IWL39_MIN_NUM_QUEUES)) {
            IWL_ERR(priv,
                  "invalid queues_num, should be between %d and %d\n",
                  IWL39_MIN_NUM_QUEUES, IWL39_MAX_NUM_QUEUES);
            err = -EINVAL;
            goto out_ieee80211_free_hw;
      }

      /*
       * Disabling hardware scan means that mac80211 will perform scans
       * "the hard way", rather than using device's scan.
       */
      if (iwl3945_mod_params.disable_hw_scan) {
            IWL_DEBUG_INFO(priv, "Disabling hw_scan\n");
            iwl3945_hw_ops.hw_scan = NULL;
      }


      IWL_DEBUG_INFO(priv, "*** LOAD DRIVER ***\n");
      priv->cfg = cfg;
      priv->pci_dev = pdev;
      priv->inta_mask = CSR_INI_SET_MASK;

#ifdef CONFIG_IWLWIFI_DEBUG
      priv->debug_level = iwl3945_mod_params.debug;
      atomic_set(&priv->restrict_refcnt, 0);
#endif

      /***************************
       * 2. Initializing PCI bus
       * *************************/
      if (pci_enable_device(pdev)) {
            err = -ENODEV;
            goto out_ieee80211_free_hw;
      }

      pci_set_master(pdev);

      err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
      if (!err)
            err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
      if (err) {
            IWL_WARN(priv, "No suitable DMA available.\n");
            goto out_pci_disable_device;
      }

      pci_set_drvdata(pdev, priv);
      err = pci_request_regions(pdev, DRV_NAME);
      if (err)
            goto out_pci_disable_device;

      /***********************
       * 3. Read REV Register
       * ********************/
      priv->hw_base = pci_iomap(pdev, 0, 0);
      if (!priv->hw_base) {
            err = -ENODEV;
            goto out_pci_release_regions;
      }

      IWL_DEBUG_INFO(priv, "pci_resource_len = 0x%08llx\n",
                  (unsigned long long) pci_resource_len(pdev, 0));
      IWL_DEBUG_INFO(priv, "pci_resource_base = %p\n", priv->hw_base);

      /* We disable the RETRY_TIMEOUT register (0x41) to keep
       * PCI Tx retries from interfering with C3 CPU state */
      pci_write_config_byte(pdev, 0x41, 0x00);

      /* this spin lock will be used in apm_ops.init and EEPROM access
       * we should init now
       */
      spin_lock_init(&priv->reg_lock);

      /* amp init */
      err = priv->cfg->ops->lib->apm_ops.init(priv);
      if (err < 0) {
            IWL_DEBUG_INFO(priv, "Failed to init the card\n");
            goto out_iounmap;
      }

      /***********************
       * 4. Read EEPROM
       * ********************/

      /* Read the EEPROM */
      err = iwl_eeprom_init(priv);
      if (err) {
            IWL_ERR(priv, "Unable to init EEPROM\n");
            goto out_iounmap;
      }
      /* MAC Address location in EEPROM same for 3945/4965 */
      eeprom = (struct iwl3945_eeprom *)priv->eeprom;
      memcpy(priv->mac_addr, eeprom->mac_address, ETH_ALEN);
      IWL_DEBUG_INFO(priv, "MAC address: %pM\n", priv->mac_addr);
      SET_IEEE80211_PERM_ADDR(priv->hw, priv->mac_addr);

      /***********************
       * 5. Setup HW Constants
       * ********************/
      /* Device-specific setup */
      if (iwl3945_hw_set_hw_params(priv)) {
            IWL_ERR(priv, "failed to set hw settings\n");
            goto out_eeprom_free;
      }

      /***********************
       * 6. Setup priv
       * ********************/

      err = iwl3945_init_drv(priv);
      if (err) {
            IWL_ERR(priv, "initializing driver failed\n");
            goto out_unset_hw_params;
      }

      IWL_INFO(priv, "Detected Intel Wireless WiFi Link %s\n",
            priv->cfg->name);

      /***********************
       * 7. Setup Services
       * ********************/

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

      pci_enable_msi(priv->pci_dev);

      err = request_irq(priv->pci_dev->irq, priv->cfg->ops->lib->isr,
                    IRQF_SHARED, DRV_NAME, priv);
      if (err) {
            IWL_ERR(priv, "Error allocating IRQ %d\n", priv->pci_dev->irq);
            goto out_disable_msi;
      }

      err = sysfs_create_group(&pdev->dev.kobj, &iwl3945_attribute_group);
      if (err) {
            IWL_ERR(priv, "failed to create sysfs device attributes\n");
            goto out_release_irq;
      }

      iwl_set_rxon_channel(priv,
                       &priv->bands[IEEE80211_BAND_2GHZ].channels[5]);
      iwl3945_setup_deferred_work(priv);
      iwl3945_setup_rx_handlers(priv);

      /*********************************
       * 8. Setup and Register mac80211
       * *******************************/

      iwl_enable_interrupts(priv);

      err = iwl3945_setup_mac(priv);
      if (err)
            goto  out_remove_sysfs;

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

      /* Start monitoring the killswitch */
      queue_delayed_work(priv->workqueue, &priv->rfkill_poll,
                     2 * HZ);

      return 0;

 out_remove_sysfs:
      destroy_workqueue(priv->workqueue);
      priv->workqueue = NULL;
      sysfs_remove_group(&pdev->dev.kobj, &iwl3945_attribute_group);
 out_release_irq:
      free_irq(priv->pci_dev->irq, priv);
 out_disable_msi:
      pci_disable_msi(priv->pci_dev);
      iwlcore_free_geos(priv);
      iwl_free_channel_map(priv);
 out_unset_hw_params:
      iwl3945_unset_hw_params(priv);
 out_eeprom_free:
      iwl_eeprom_free(priv);
 out_iounmap:
      pci_iounmap(pdev, priv->hw_base);
 out_pci_release_regions:
      pci_release_regions(pdev);
 out_pci_disable_device:
      pci_set_drvdata(pdev, NULL);
      pci_disable_device(pdev);
 out_ieee80211_free_hw:
      ieee80211_free_hw(priv->hw);
 out:
      return err;
}

static void __devexit iwl3945_pci_remove(struct pci_dev *pdev)
{
      struct iwl_priv *priv = pci_get_drvdata(pdev);
      unsigned long flags;

      if (!priv)
            return;

      IWL_DEBUG_INFO(priv, "*** UNLOAD DRIVER ***\n");

      iwl_dbgfs_unregister(priv);

      set_bit(STATUS_EXIT_PENDING, &priv->status);

      if (priv->mac80211_registered) {
            ieee80211_unregister_hw(priv->hw);
            priv->mac80211_registered = 0;
      } else {
            iwl3945_down(priv);
      }

      /* make sure we flush any pending irq or
       * tasklet for the driver
       */
      spin_lock_irqsave(&priv->lock, flags);
      iwl_disable_interrupts(priv);
      spin_unlock_irqrestore(&priv->lock, flags);

      iwl_synchronize_irq(priv);

      sysfs_remove_group(&pdev->dev.kobj, &iwl3945_attribute_group);

      cancel_delayed_work_sync(&priv->rfkill_poll);

      iwl3945_dealloc_ucode_pci(priv);

      if (priv->rxq.bd)
            iwl3945_rx_queue_free(priv, &priv->rxq);
      iwl3945_hw_txq_ctx_free(priv);

      iwl3945_unset_hw_params(priv);
      iwl_clear_stations_table(priv);

      /*netif_stop_queue(dev); */
      flush_workqueue(priv->workqueue);

      /* ieee80211_unregister_hw calls iwl3945_mac_stop, which flushes
       * priv->workqueue... so we can't take down the workqueue
       * until now... */
      destroy_workqueue(priv->workqueue);
      priv->workqueue = NULL;

      free_irq(pdev->irq, priv);
      pci_disable_msi(pdev);

      pci_iounmap(pdev, priv->hw_base);
      pci_release_regions(pdev);
      pci_disable_device(pdev);
      pci_set_drvdata(pdev, NULL);

      iwl_free_channel_map(priv);
      iwlcore_free_geos(priv);
      kfree(priv->scan);
      if (priv->ibss_beacon)
            dev_kfree_skb(priv->ibss_beacon);

      ieee80211_free_hw(priv->hw);
}


/*****************************************************************************
 *
 * driver and module entry point
 *
 *****************************************************************************/

static struct pci_driver iwl3945_driver = {
      .name = DRV_NAME,
      .id_table = iwl3945_hw_card_ids,
      .probe = iwl3945_pci_probe,
      .remove = __devexit_p(iwl3945_pci_remove),
#ifdef CONFIG_PM
      .suspend = iwl_pci_suspend,
      .resume = iwl_pci_resume,
#endif
};

static int __init iwl3945_init(void)
{

      int ret;
      printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION ", " DRV_VERSION "\n");
      printk(KERN_INFO DRV_NAME ": " DRV_COPYRIGHT "\n");

      ret = iwl3945_rate_control_register();
      if (ret) {
            printk(KERN_ERR DRV_NAME
                   "Unable to register rate control algorithm: %d\n", ret);
            return ret;
      }

      ret = pci_register_driver(&iwl3945_driver);
      if (ret) {
            printk(KERN_ERR DRV_NAME "Unable to initialize PCI module\n");
            goto error_register;
      }

      return ret;

error_register:
      iwl3945_rate_control_unregister();
      return ret;
}

static void __exit iwl3945_exit(void)
{
      pci_unregister_driver(&iwl3945_driver);
      iwl3945_rate_control_unregister();
}

MODULE_FIRMWARE(IWL3945_MODULE_FIRMWARE(IWL3945_UCODE_API_MAX));

module_param_named(antenna, iwl3945_mod_params.antenna, int, 0444);
MODULE_PARM_DESC(antenna, "select antenna (1=Main, 2=Aux, default 0 [both])");
module_param_named(swcrypto, iwl3945_mod_params.sw_crypto, int, 0444);
MODULE_PARM_DESC(swcrypto,
             "using software crypto (default 1 [software])\n");
module_param_named(debug, iwl3945_mod_params.debug, uint, 0444);
MODULE_PARM_DESC(debug, "debug output mask");
module_param_named(disable_hw_scan, iwl3945_mod_params.disable_hw_scan, int, 0444);
MODULE_PARM_DESC(disable_hw_scan, "disable hardware scanning (default 0)");

module_param_named(queues_num, iwl3945_mod_params.num_of_queues, int, 0444);
MODULE_PARM_DESC(queues_num, "number of hw queues.");

module_param_named(fw_restart3945, iwl3945_mod_params.restart_fw, int, 0444);
MODULE_PARM_DESC(fw_restart3945, "restart firmware in case of error");

module_exit(iwl3945_exit);
module_init(iwl3945_init);

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