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iwl-4965.c

/******************************************************************************
 *
 * Copyright(c) 2003 - 2007 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 * James P. Ketrenos <ipw2100-admin@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/version.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 <net/mac80211.h>
#include <linux/etherdevice.h>

#define IWL 4965

#include "iwlwifi.h"
#include "iwl-4965.h"
#include "iwl-helpers.h"

#define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
      [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
                            IWL_RATE_SISO_##s##M_PLCP, \
                            IWL_RATE_MIMO_##s##M_PLCP, \
                            IWL_RATE_##r##M_IEEE,      \
                            IWL_RATE_##ip##M_INDEX,    \
                            IWL_RATE_##in##M_INDEX,    \
                            IWL_RATE_##rp##M_INDEX,    \
                            IWL_RATE_##rn##M_INDEX,    \
                            IWL_RATE_##pp##M_INDEX,    \
                            IWL_RATE_##np##M_INDEX }

/*
 * Parameter order:
 *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
 *
 * If there isn't a valid next or previous rate then INV is used which
 * maps to IWL_RATE_INVALID
 *
 */
const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
      IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
      IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
      IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
      IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
      IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
      IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
      IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
      IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
      IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
      IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
      IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
      IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
      IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
};

static int is_fat_channel(__le32 rxon_flags)
{
      return (rxon_flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK) ||
            (rxon_flags & RXON_FLG_CHANNEL_MODE_MIXED_MSK);
}

static u8 is_single_stream(struct iwl_priv *priv)
{
#ifdef CONFIG_IWLWIFI_HT
      if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht ||
          (priv->active_rate_ht[1] == 0) ||
          (priv->ps_mode == IWL_MIMO_PS_STATIC))
            return 1;
#else
      return 1;
#endif      /*CONFIG_IWLWIFI_HT */
      return 0;
}

/*
 * Determine how many receiver/antenna chains to use.
 * More provides better reception via diversity.  Fewer saves power.
 * MIMO (dual stream) requires at least 2, but works better with 3.
 * This does not determine *which* chains to use, just how many.
 */
static int iwl4965_get_rx_chain_counter(struct iwl_priv *priv,
                              u8 *idle_state, u8 *rx_state)
{
      u8 is_single = is_single_stream(priv);
      u8 is_cam = test_bit(STATUS_POWER_PMI, &priv->status) ? 0 : 1;

      /* # of Rx chains to use when expecting MIMO. */
      if (is_single || (!is_cam && (priv->ps_mode == IWL_MIMO_PS_STATIC)))
            *rx_state = 2;
      else
            *rx_state = 3;

      /* # Rx chains when idling and maybe trying to save power */
      switch (priv->ps_mode) {
      case IWL_MIMO_PS_STATIC:
      case IWL_MIMO_PS_DYNAMIC:
            *idle_state = (is_cam) ? 2 : 1;
            break;
      case IWL_MIMO_PS_NONE:
            *idle_state = (is_cam) ? *rx_state : 1;
            break;
      default:
            *idle_state = 1;
            break;
      }

      return 0;
}

int iwl_hw_rxq_stop(struct iwl_priv *priv)
{
      int rc;
      unsigned long flags;

      spin_lock_irqsave(&priv->lock, flags);
      rc = iwl_grab_restricted_access(priv);
      if (rc) {
            spin_unlock_irqrestore(&priv->lock, flags);
            return rc;
      }

      /* stop HW */
      iwl_write_restricted(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
      rc = iwl_poll_restricted_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
                             (1 << 24), 1000);
      if (rc < 0)
            IWL_ERROR("Can't stop Rx DMA.\n");

      iwl_release_restricted_access(priv);
      spin_unlock_irqrestore(&priv->lock, flags);

      return 0;
}

u8 iwl_hw_find_station(struct iwl_priv *priv, const u8 *addr)
{
      int i;
      int start = 0;
      int ret = IWL_INVALID_STATION;
      unsigned long flags;
      DECLARE_MAC_BUF(mac);

      if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) ||
          (priv->iw_mode == IEEE80211_IF_TYPE_AP))
            start = IWL_STA_ID;

      if (is_broadcast_ether_addr(addr))
            return IWL4965_BROADCAST_ID;

      spin_lock_irqsave(&priv->sta_lock, flags);
      for (i = start; i < priv->hw_setting.max_stations; i++)
            if ((priv->stations[i].used) &&
                (!compare_ether_addr
                 (priv->stations[i].sta.sta.addr, addr))) {
                  ret = i;
                  goto out;
            }

      IWL_DEBUG_ASSOC_LIMIT("can not find STA %s total %d\n",
                  print_mac(mac, addr), priv->num_stations);

 out:
      spin_unlock_irqrestore(&priv->sta_lock, flags);
      return ret;
}

static int iwl4965_nic_set_pwr_src(struct iwl_priv *priv, int pwr_max)
{
      int rc = 0;
      unsigned long flags;

      spin_lock_irqsave(&priv->lock, flags);
      rc = iwl_grab_restricted_access(priv);
      if (rc) {
            spin_unlock_irqrestore(&priv->lock, flags);
            return rc;
      }

      if (!pwr_max) {
            u32 val;

            rc = pci_read_config_dword(priv->pci_dev, PCI_POWER_SOURCE,
                                 &val);

            if (val & PCI_CFG_PMC_PME_FROM_D3COLD_SUPPORT)
                  iwl_set_bits_mask_restricted_reg(
                        priv, APMG_PS_CTRL_REG,
                        APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
                        ~APMG_PS_CTRL_MSK_PWR_SRC);
      } else
            iwl_set_bits_mask_restricted_reg(
                  priv, APMG_PS_CTRL_REG,
                  APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
                  ~APMG_PS_CTRL_MSK_PWR_SRC);

      iwl_release_restricted_access(priv);
      spin_unlock_irqrestore(&priv->lock, flags);

      return rc;
}

static int iwl4965_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
{
      int rc;
      unsigned long flags;

      spin_lock_irqsave(&priv->lock, flags);
      rc = iwl_grab_restricted_access(priv);
      if (rc) {
            spin_unlock_irqrestore(&priv->lock, flags);
            return rc;
      }

      /* stop HW */
      iwl_write_restricted(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);

      iwl_write_restricted(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
      iwl_write_restricted(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
                       rxq->dma_addr >> 8);

      iwl_write_restricted(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
                       (priv->hw_setting.shared_phys +
                        offsetof(struct iwl_shared, val0)) >> 4);

      iwl_write_restricted(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
                       FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
                       FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
                       IWL_FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K |
                       /*0x10 << 4 | */
                       (RX_QUEUE_SIZE_LOG <<
                        FH_RCSR_RX_CONFIG_RBDCB_SIZE_BITSHIFT));

      /*
       * iwl_write32(priv,CSR_INT_COAL_REG,0);
       */

      iwl_release_restricted_access(priv);
      spin_unlock_irqrestore(&priv->lock, flags);

      return 0;
}

static int iwl4965_kw_init(struct iwl_priv *priv)
{
      unsigned long flags;
      int rc;

      spin_lock_irqsave(&priv->lock, flags);
      rc = iwl_grab_restricted_access(priv);
      if (rc)
            goto out;

      iwl_write_restricted(priv, IWL_FH_KW_MEM_ADDR_REG,
                       priv->kw.dma_addr >> 4);
      iwl_release_restricted_access(priv);
out:
      spin_unlock_irqrestore(&priv->lock, flags);
      return rc;
}

static int iwl4965_kw_alloc(struct iwl_priv *priv)
{
      struct pci_dev *dev = priv->pci_dev;
      struct iwl_kw *kw = &priv->kw;

      kw->size = IWL4965_KW_SIZE;   /* TBW need set somewhere else */
      kw->v_addr = pci_alloc_consistent(dev, kw->size, &kw->dma_addr);
      if (!kw->v_addr)
            return -ENOMEM;

      return 0;
}

#define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
                      ? # x " " : "")

int iwl4965_set_fat_chan_info(struct iwl_priv *priv, int phymode, u16 channel,
                        const struct iwl_eeprom_channel *eeprom_ch,
                        u8 fat_extension_channel)
{
      struct iwl_channel_info *ch_info;

      ch_info = (struct iwl_channel_info *)
                  iwl_get_channel_info(priv, phymode, channel);

      if (!is_channel_valid(ch_info))
            return -1;

      IWL_DEBUG_INFO("FAT Ch. %d [%sGHz] %s%s%s%s%s%s(0x%02x"
                  " %ddBm): Ad-Hoc %ssupported\n",
                  ch_info->channel,
                  is_channel_a_band(ch_info) ?
                  "5.2" : "2.4",
                  CHECK_AND_PRINT(IBSS),
                  CHECK_AND_PRINT(ACTIVE),
                  CHECK_AND_PRINT(RADAR),
                  CHECK_AND_PRINT(WIDE),
                  CHECK_AND_PRINT(NARROW),
                  CHECK_AND_PRINT(DFS),
                  eeprom_ch->flags,
                  eeprom_ch->max_power_avg,
                  ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS)
                   && !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ?
                  "" : "not ");

      ch_info->fat_eeprom = *eeprom_ch;
      ch_info->fat_max_power_avg = eeprom_ch->max_power_avg;
      ch_info->fat_curr_txpow = eeprom_ch->max_power_avg;
      ch_info->fat_min_power = 0;
      ch_info->fat_scan_power = eeprom_ch->max_power_avg;
      ch_info->fat_flags = eeprom_ch->flags;
      ch_info->fat_extension_channel = fat_extension_channel;

      return 0;
}

static void iwl4965_kw_free(struct iwl_priv *priv)
{
      struct pci_dev *dev = priv->pci_dev;
      struct iwl_kw *kw = &priv->kw;

      if (kw->v_addr) {
            pci_free_consistent(dev, kw->size, kw->v_addr, kw->dma_addr);
            memset(kw, 0, sizeof(*kw));
      }
}

/**
 * iwl4965_txq_ctx_reset - Reset TX queue context
 * Destroys all DMA structures and initialise them again
 *
 * @param priv
 * @return error code
 */
static int iwl4965_txq_ctx_reset(struct iwl_priv *priv)
{
      int rc = 0;
      int txq_id, slots_num;
      unsigned long flags;

      iwl4965_kw_free(priv);

      iwl_hw_txq_ctx_free(priv);

      /* Tx CMD queue */
      rc = iwl4965_kw_alloc(priv);
      if (rc) {
            IWL_ERROR("Keep Warm allocation failed");
            goto error_kw;
      }

      spin_lock_irqsave(&priv->lock, flags);

      rc = iwl_grab_restricted_access(priv);
      if (unlikely(rc)) {
            IWL_ERROR("TX reset failed");
            spin_unlock_irqrestore(&priv->lock, flags);
            goto error_reset;
      }

      iwl_write_restricted_reg(priv, SCD_TXFACT, 0);
      iwl_release_restricted_access(priv);
      spin_unlock_irqrestore(&priv->lock, flags);

      rc = iwl4965_kw_init(priv);
      if (rc) {
            IWL_ERROR("kw_init failed\n");
            goto error_reset;
      }

      /* Tx queue(s) */
      for (txq_id = 0; txq_id < priv->hw_setting.max_txq_num; txq_id++) {
            slots_num = (txq_id == IWL_CMD_QUEUE_NUM) ?
                              TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
            rc = iwl_tx_queue_init(priv, &priv->txq[txq_id], slots_num,
                               txq_id);
            if (rc) {
                  IWL_ERROR("Tx %d queue init failed\n", txq_id);
                  goto error;
            }
      }

      return rc;

 error:
      iwl_hw_txq_ctx_free(priv);
 error_reset:
      iwl4965_kw_free(priv);
 error_kw:
      return rc;
}

int iwl_hw_nic_init(struct iwl_priv *priv)
{
      int rc;
      unsigned long flags;
      struct iwl_rx_queue *rxq = &priv->rxq;
      u8 rev_id;
      u32 val;
      u8 val_link;

      iwl_power_init_handle(priv);

      /* nic_init */
      spin_lock_irqsave(&priv->lock, flags);

      iwl_set_bit(priv, CSR_GIO_CHICKEN_BITS,
                CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);

      iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
      rc = iwl_poll_bit(priv, CSR_GP_CNTRL,
                    CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
                    CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
      if (rc < 0) {
            spin_unlock_irqrestore(&priv->lock, flags);
            IWL_DEBUG_INFO("Failed to init the card\n");
            return rc;
      }

      rc = iwl_grab_restricted_access(priv);
      if (rc) {
            spin_unlock_irqrestore(&priv->lock, flags);
            return rc;
      }

      iwl_read_restricted_reg(priv, APMG_CLK_CTRL_REG);

      iwl_write_restricted_reg(priv, APMG_CLK_CTRL_REG,
                         APMG_CLK_VAL_DMA_CLK_RQT |
                         APMG_CLK_VAL_BSM_CLK_RQT);
      iwl_read_restricted_reg(priv, APMG_CLK_CTRL_REG);

      udelay(20);

      iwl_set_bits_restricted_reg(priv, APMG_PCIDEV_STT_REG,
                            APMG_PCIDEV_STT_VAL_L1_ACT_DIS);

      iwl_release_restricted_access(priv);
      iwl_write32(priv, CSR_INT_COALESCING, 512 / 32);
      spin_unlock_irqrestore(&priv->lock, flags);

      /* Determine HW type */
      rc = pci_read_config_byte(priv->pci_dev, PCI_REVISION_ID, &rev_id);
      if (rc)
            return rc;

      IWL_DEBUG_INFO("HW Revision ID = 0x%X\n", rev_id);

      iwl4965_nic_set_pwr_src(priv, 1);
      spin_lock_irqsave(&priv->lock, flags);

      if ((rev_id & 0x80) == 0x80 && (rev_id & 0x7f) < 8) {
            pci_read_config_dword(priv->pci_dev, PCI_REG_WUM8, &val);
            /* Enable No Snoop field */
            pci_write_config_dword(priv->pci_dev, PCI_REG_WUM8,
                               val & ~(1 << 11));
      }

      spin_unlock_irqrestore(&priv->lock, flags);

      /* Read the EEPROM */
      rc = iwl_eeprom_init(priv);
      if (rc)
            return rc;

      if (priv->eeprom.calib_version < EEPROM_TX_POWER_VERSION_NEW) {
            IWL_ERROR("Older EEPROM detected!  Aborting.\n");
            return -EINVAL;
      }

      pci_read_config_byte(priv->pci_dev, PCI_LINK_CTRL, &val_link);

      /* disable L1 entry -- workaround for pre-B1 */
      pci_write_config_byte(priv->pci_dev, PCI_LINK_CTRL, val_link & ~0x02);

      spin_lock_irqsave(&priv->lock, flags);

      /* set CSR_HW_CONFIG_REG for uCode use */

      iwl_set_bit(priv, CSR_SW_VER, CSR_HW_IF_CONFIG_REG_BIT_KEDRON_R |
                CSR_HW_IF_CONFIG_REG_BIT_RADIO_SI |
                CSR_HW_IF_CONFIG_REG_BIT_MAC_SI);

      rc = iwl_grab_restricted_access(priv);
      if (rc < 0) {
            spin_unlock_irqrestore(&priv->lock, flags);
            IWL_DEBUG_INFO("Failed to init the card\n");
            return rc;
      }

      iwl_read_restricted_reg(priv, APMG_PS_CTRL_REG);
      iwl_set_bits_restricted_reg(priv, APMG_PS_CTRL_REG,
                            APMG_PS_CTRL_VAL_RESET_REQ);
      udelay(5);
      iwl_clear_bits_restricted_reg(priv, APMG_PS_CTRL_REG,
                              APMG_PS_CTRL_VAL_RESET_REQ);

      iwl_release_restricted_access(priv);
      spin_unlock_irqrestore(&priv->lock, flags);

      iwl_hw_card_show_info(priv);

      /* end nic_init */

      /* Allocate the RX queue, or reset if it is already allocated */
      if (!rxq->bd) {
            rc = iwl_rx_queue_alloc(priv);
            if (rc) {
                  IWL_ERROR("Unable to initialize Rx queue\n");
                  return -ENOMEM;
            }
      } else
            iwl_rx_queue_reset(priv, rxq);

      iwl_rx_replenish(priv);

      iwl4965_rx_init(priv, rxq);

      spin_lock_irqsave(&priv->lock, flags);

      rxq->need_update = 1;
      iwl_rx_queue_update_write_ptr(priv, rxq);

      spin_unlock_irqrestore(&priv->lock, flags);
      rc = iwl4965_txq_ctx_reset(priv);
      if (rc)
            return rc;

      if (priv->eeprom.sku_cap & EEPROM_SKU_CAP_SW_RF_KILL_ENABLE)
            IWL_DEBUG_RF_KILL("SW RF KILL supported in EEPROM.\n");

      if (priv->eeprom.sku_cap & EEPROM_SKU_CAP_HW_RF_KILL_ENABLE)
            IWL_DEBUG_RF_KILL("HW RF KILL supported in EEPROM.\n");

      set_bit(STATUS_INIT, &priv->status);

      return 0;
}

int iwl_hw_nic_stop_master(struct iwl_priv *priv)
{
      int rc = 0;
      u32 reg_val;
      unsigned long flags;

      spin_lock_irqsave(&priv->lock, flags);

      /* set stop master bit */
      iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);

      reg_val = iwl_read32(priv, CSR_GP_CNTRL);

      if (CSR_GP_CNTRL_REG_FLAG_MAC_POWER_SAVE ==
          (reg_val & CSR_GP_CNTRL_REG_MSK_POWER_SAVE_TYPE))
            IWL_DEBUG_INFO("Card in power save, master is already "
                         "stopped\n");
      else {
            rc = iwl_poll_bit(priv, CSR_RESET,
                          CSR_RESET_REG_FLAG_MASTER_DISABLED,
                          CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
            if (rc < 0) {
                  spin_unlock_irqrestore(&priv->lock, flags);
                  return rc;
            }
      }

      spin_unlock_irqrestore(&priv->lock, flags);
      IWL_DEBUG_INFO("stop master\n");

      return rc;
}

void iwl_hw_txq_ctx_stop(struct iwl_priv *priv)
{

      int txq_id;
      unsigned long flags;

      /* reset TFD queues */
      for (txq_id = 0; txq_id < priv->hw_setting.max_txq_num; txq_id++) {
            spin_lock_irqsave(&priv->lock, flags);
            if (iwl_grab_restricted_access(priv)) {
                  spin_unlock_irqrestore(&priv->lock, flags);
                  continue;
            }

            iwl_write_restricted(priv,
                             IWL_FH_TCSR_CHNL_TX_CONFIG_REG(txq_id),
                             0x0);
            iwl_poll_restricted_bit(priv, IWL_FH_TSSR_TX_STATUS_REG,
                              IWL_FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE
                              (txq_id), 200);
            iwl_release_restricted_access(priv);
            spin_unlock_irqrestore(&priv->lock, flags);
      }

      iwl_hw_txq_ctx_free(priv);
}

int iwl_hw_nic_reset(struct iwl_priv *priv)
{
      int rc = 0;
      unsigned long flags;

      iwl_hw_nic_stop_master(priv);

      spin_lock_irqsave(&priv->lock, flags);

      iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);

      udelay(10);

      iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
      rc = iwl_poll_bit(priv, CSR_RESET,
                    CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
                    CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25);

      udelay(10);

      rc = iwl_grab_restricted_access(priv);
      if (!rc) {
            iwl_write_restricted_reg(priv, APMG_CLK_EN_REG,
                               APMG_CLK_VAL_DMA_CLK_RQT |
                               APMG_CLK_VAL_BSM_CLK_RQT);

            udelay(10);

            iwl_set_bits_restricted_reg(priv, APMG_PCIDEV_STT_REG,
                        APMG_PCIDEV_STT_VAL_L1_ACT_DIS);

            iwl_release_restricted_access(priv);
      }

      clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
      wake_up_interruptible(&priv->wait_command_queue);

      spin_unlock_irqrestore(&priv->lock, flags);

      return rc;

}

#define REG_RECALIB_PERIOD (60)

/**
 * iwl4965_bg_statistics_periodic - Timer callback to queue statistics
 *
 * This callback is provided in order to queue the statistics_work
 * in work_queue context (v. softirq)
 *
 * This timer function is continually reset to execute within
 * REG_RECALIB_PERIOD seconds since the last STATISTICS_NOTIFICATION
 * was received.  We need to ensure we receive the statistics in order
 * to update the temperature used for calibrating the TXPOWER.  However,
 * we can't send the statistics command from softirq context (which
 * is the context which timers run at) so we have to queue off the
 * statistics_work to actually send the command to the hardware.
 */
static void iwl4965_bg_statistics_periodic(unsigned long data)
{
      struct iwl_priv *priv = (struct iwl_priv *)data;

      queue_work(priv->workqueue, &priv->statistics_work);
}

/**
 * iwl4965_bg_statistics_work - Send the statistics request to the hardware.
 *
 * This is queued by iwl_bg_statistics_periodic.
 */
static void iwl4965_bg_statistics_work(struct work_struct *work)
{
      struct iwl_priv *priv = container_of(work, struct iwl_priv,
                                   statistics_work);

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

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

#define CT_LIMIT_CONST        259
#define TM_CT_KILL_THRESHOLD  110

void iwl4965_rf_kill_ct_config(struct iwl_priv *priv)
{
      struct iwl_ct_kill_config cmd;
      u32 R1, R2, R3;
      u32 temp_th;
      u32 crit_temperature;
      unsigned long flags;
      int rc = 0;

      spin_lock_irqsave(&priv->lock, flags);
      iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
                CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
      spin_unlock_irqrestore(&priv->lock, flags);

      if (priv->statistics.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK) {
            R1 = (s32)le32_to_cpu(priv->card_alive_init.therm_r1[1]);
            R2 = (s32)le32_to_cpu(priv->card_alive_init.therm_r2[1]);
            R3 = (s32)le32_to_cpu(priv->card_alive_init.therm_r3[1]);
      } else {
            R1 = (s32)le32_to_cpu(priv->card_alive_init.therm_r1[0]);
            R2 = (s32)le32_to_cpu(priv->card_alive_init.therm_r2[0]);
            R3 = (s32)le32_to_cpu(priv->card_alive_init.therm_r3[0]);
      }

      temp_th = CELSIUS_TO_KELVIN(TM_CT_KILL_THRESHOLD);

      crit_temperature = ((temp_th * (R3-R1))/CT_LIMIT_CONST) + R2;
      cmd.critical_temperature_R =  cpu_to_le32(crit_temperature);
      rc = iwl_send_cmd_pdu(priv,
                        REPLY_CT_KILL_CONFIG_CMD, sizeof(cmd), &cmd);
      if (rc)
            IWL_ERROR("REPLY_CT_KILL_CONFIG_CMD failed\n");
      else
            IWL_DEBUG_INFO("REPLY_CT_KILL_CONFIG_CMD succeeded\n");
}

#ifdef CONFIG_IWLWIFI_SENSITIVITY

/* "false alarms" are signals that our DSP tries to lock onto,
 *   but then determines that they are either noise, or transmissions
 *   from a distant wireless network (also "noise", really) that get
 *   "stepped on" by stronger transmissions within our own network.
 * This algorithm attempts to set a sensitivity level that is high
 *   enough to receive all of our own network traffic, but not so
 *   high that our DSP gets too busy trying to lock onto non-network
 *   activity/noise. */
static int iwl4965_sens_energy_cck(struct iwl_priv *priv,
                           u32 norm_fa,
                           u32 rx_enable_time,
                           struct statistics_general_data *rx_info)
{
      u32 max_nrg_cck = 0;
      int i = 0;
      u8 max_silence_rssi = 0;
      u32 silence_ref = 0;
      u8 silence_rssi_a = 0;
      u8 silence_rssi_b = 0;
      u8 silence_rssi_c = 0;
      u32 val;

      /* "false_alarms" values below are cross-multiplications to assess the
       *   numbers of false alarms within the measured period of actual Rx
       *   (Rx is off when we're txing), vs the min/max expected false alarms
       *   (some should be expected if rx is sensitive enough) in a
       *   hypothetical listening period of 200 time units (TU), 204.8 msec:
       *
       * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
       *
       * */
      u32 false_alarms = norm_fa * 200 * 1024;
      u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
      u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
      struct iwl_sensitivity_data *data = NULL;

      data = &(priv->sensitivity_data);

      data->nrg_auto_corr_silence_diff = 0;

      /* Find max silence rssi among all 3 receivers.
       * This is background noise, which may include transmissions from other
       *    networks, measured during silence before our network's beacon */
      silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
                      ALL_BAND_FILTER)>>8);
      silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
                      ALL_BAND_FILTER)>>8);
      silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
                      ALL_BAND_FILTER)>>8);

      val = max(silence_rssi_b, silence_rssi_c);
      max_silence_rssi = max(silence_rssi_a, (u8) val);

      /* Store silence rssi in 20-beacon history table */
      data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
      data->nrg_silence_idx++;
      if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
            data->nrg_silence_idx = 0;

      /* Find max silence rssi across 20 beacon history */
      for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
            val = data->nrg_silence_rssi[i];
            silence_ref = max(silence_ref, val);
      }
      IWL_DEBUG_CALIB("silence a %u, b %u, c %u, 20-bcn max %u\n",
                  silence_rssi_a, silence_rssi_b, silence_rssi_c,
                  silence_ref);

      /* Find max rx energy (min value!) among all 3 receivers,
       *   measured during beacon frame.
       * Save it in 10-beacon history table. */
      i = data->nrg_energy_idx;
      val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
      data->nrg_value[i] = min(rx_info->beacon_energy_a, val);

      data->nrg_energy_idx++;
      if (data->nrg_energy_idx >= 10)
            data->nrg_energy_idx = 0;

      /* Find min rx energy (max value) across 10 beacon history.
       * This is the minimum signal level that we want to receive well.
       * Add backoff (margin so we don't miss slightly lower energy frames).
       * This establishes an upper bound (min value) for energy threshold. */
      max_nrg_cck = data->nrg_value[0];
      for (i = 1; i < 10; i++)
            max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
      max_nrg_cck += 6;

      IWL_DEBUG_CALIB("rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
                  rx_info->beacon_energy_a, rx_info->beacon_energy_b,
                  rx_info->beacon_energy_c, max_nrg_cck - 6);

      /* Count number of consecutive beacons with fewer-than-desired
       *   false alarms. */
      if (false_alarms < min_false_alarms)
            data->num_in_cck_no_fa++;
      else
            data->num_in_cck_no_fa = 0;
      IWL_DEBUG_CALIB("consecutive bcns with few false alarms = %u\n",
                  data->num_in_cck_no_fa);

      /* If we got too many false alarms this time, reduce sensitivity */
      if (false_alarms > max_false_alarms) {
            IWL_DEBUG_CALIB("norm FA %u > max FA %u\n",
                       false_alarms, max_false_alarms);
            IWL_DEBUG_CALIB("... reducing sensitivity\n");
            data->nrg_curr_state = IWL_FA_TOO_MANY;

            if (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK) {
                  /* Store for "fewer than desired" on later beacon */
                  data->nrg_silence_ref = silence_ref;

                  /* increase energy threshold (reduce nrg value)
                   *   to decrease sensitivity */
                  if (data->nrg_th_cck > (NRG_MAX_CCK + NRG_STEP_CCK))
                        data->nrg_th_cck = data->nrg_th_cck
                                           - NRG_STEP_CCK;
            }

            /* increase auto_corr values to decrease sensitivity */
            if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
                  data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
            else {
                  val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
                  data->auto_corr_cck = min((u32)AUTO_CORR_MAX_CCK, val);
            }
            val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
            data->auto_corr_cck_mrc = min((u32)AUTO_CORR_MAX_CCK_MRC, val);

      /* Else if we got fewer than desired, increase sensitivity */
      } else if (false_alarms < min_false_alarms) {
            data->nrg_curr_state = IWL_FA_TOO_FEW;

            /* Compare silence level with silence level for most recent
             *   healthy number or too many false alarms */
            data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
                                       (s32)silence_ref;

            IWL_DEBUG_CALIB("norm FA %u < min FA %u, silence diff %d\n",
                   false_alarms, min_false_alarms,
                   data->nrg_auto_corr_silence_diff);

            /* Increase value to increase sensitivity, but only if:
             * 1a) previous beacon did *not* have *too many* false alarms
             * 1b) AND there's a significant difference in Rx levels
             *      from a previous beacon with too many, or healthy # FAs
             * OR 2) We've seen a lot of beacons (100) with too few
             *       false alarms */
            if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
                  ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
                  (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {

                  IWL_DEBUG_CALIB("... increasing sensitivity\n");
                  /* Increase nrg value to increase sensitivity */
                  val = data->nrg_th_cck + NRG_STEP_CCK;
                  data->nrg_th_cck = min((u32)NRG_MIN_CCK, val);

                  /* Decrease auto_corr values to increase sensitivity */
                  val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
                  data->auto_corr_cck = max((u32)AUTO_CORR_MIN_CCK, val);

                  val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
                  data->auto_corr_cck_mrc =
                               max((u32)AUTO_CORR_MIN_CCK_MRC, val);

            } else
                  IWL_DEBUG_CALIB("... but not changing sensitivity\n");

      /* Else we got a healthy number of false alarms, keep status quo */
      } else {
            IWL_DEBUG_CALIB(" FA in safe zone\n");
            data->nrg_curr_state = IWL_FA_GOOD_RANGE;

            /* Store for use in "fewer than desired" with later beacon */
            data->nrg_silence_ref = silence_ref;

            /* If previous beacon had too many false alarms,
             *   give it some extra margin by reducing sensitivity again
             *   (but don't go below measured energy of desired Rx) */
            if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
                  IWL_DEBUG_CALIB("... increasing margin\n");
                  data->nrg_th_cck -= NRG_MARGIN;
            }
      }

      /* Make sure the energy threshold does not go above the measured
       * energy of the desired Rx signals (reduced by backoff margin),
       * or else we might start missing Rx frames.
       * Lower value is higher energy, so we use max()!
       */
      data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
      IWL_DEBUG_CALIB("new nrg_th_cck %u\n", data->nrg_th_cck);

      data->nrg_prev_state = data->nrg_curr_state;

      return 0;
}


static int iwl4965_sens_auto_corr_ofdm(struct iwl_priv *priv,
                               u32 norm_fa,
                               u32 rx_enable_time)
{
      u32 val;
      u32 false_alarms = norm_fa * 200 * 1024;
      u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
      u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
      struct iwl_sensitivity_data *data = NULL;

      data = &(priv->sensitivity_data);

      /* If we got too many false alarms this time, reduce sensitivity */
      if (false_alarms > max_false_alarms) {

            IWL_DEBUG_CALIB("norm FA %u > max FA %u)\n",
                       false_alarms, max_false_alarms);

            val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
            data->auto_corr_ofdm =
                        min((u32)AUTO_CORR_MAX_OFDM, val);

            val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
            data->auto_corr_ofdm_mrc =
                        min((u32)AUTO_CORR_MAX_OFDM_MRC, val);

            val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
            data->auto_corr_ofdm_x1 =
                        min((u32)AUTO_CORR_MAX_OFDM_X1, val);

            val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
            data->auto_corr_ofdm_mrc_x1 =
                        min((u32)AUTO_CORR_MAX_OFDM_MRC_X1, val);
      }

      /* Else if we got fewer than desired, increase sensitivity */
      else if (false_alarms < min_false_alarms) {

            IWL_DEBUG_CALIB("norm FA %u < min FA %u\n",
                       false_alarms, min_false_alarms);

            val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
            data->auto_corr_ofdm =
                        max((u32)AUTO_CORR_MIN_OFDM, val);

            val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
            data->auto_corr_ofdm_mrc =
                        max((u32)AUTO_CORR_MIN_OFDM_MRC, val);

            val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
            data->auto_corr_ofdm_x1 =
                        max((u32)AUTO_CORR_MIN_OFDM_X1, val);

            val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
            data->auto_corr_ofdm_mrc_x1 =
                        max((u32)AUTO_CORR_MIN_OFDM_MRC_X1, val);
      }

      else
            IWL_DEBUG_CALIB("min FA %u < norm FA %u < max FA %u OK\n",
                   min_false_alarms, false_alarms, max_false_alarms);

      return 0;
}

static int iwl_sensitivity_callback(struct iwl_priv *priv,
                            struct iwl_cmd *cmd, struct sk_buff *skb)
{
      /* We didn't cache the SKB; let the caller free it */
      return 1;
}

/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
static int iwl4965_sensitivity_write(struct iwl_priv *priv, u8 flags)
{
      int rc = 0;
      struct iwl_sensitivity_cmd cmd ;
      struct iwl_sensitivity_data *data = NULL;
      struct iwl_host_cmd cmd_out = {
            .id = SENSITIVITY_CMD,
            .len = sizeof(struct iwl_sensitivity_cmd),
            .meta.flags = flags,
            .data = &cmd,
      };

      data = &(priv->sensitivity_data);

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

      cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
                        cpu_to_le16((u16)data->auto_corr_ofdm);
      cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
                        cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
      cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
                        cpu_to_le16((u16)data->auto_corr_ofdm_x1);
      cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
                        cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);

      cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
                        cpu_to_le16((u16)data->auto_corr_cck);
      cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
                        cpu_to_le16((u16)data->auto_corr_cck_mrc);

      cmd.table[HD_MIN_ENERGY_CCK_DET_INDEX] =
                        cpu_to_le16((u16)data->nrg_th_cck);
      cmd.table[HD_MIN_ENERGY_OFDM_DET_INDEX] =
                        cpu_to_le16((u16)data->nrg_th_ofdm);

      cmd.table[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
                        __constant_cpu_to_le16(190);
      cmd.table[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
                        __constant_cpu_to_le16(390);
      cmd.table[HD_OFDM_ENERGY_TH_IN_INDEX] =
                        __constant_cpu_to_le16(62);

      IWL_DEBUG_CALIB("ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
                  data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
                  data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
                  data->nrg_th_ofdm);

      IWL_DEBUG_CALIB("cck: ac %u mrc %u thresh %u\n",
                  data->auto_corr_cck, data->auto_corr_cck_mrc,
                  data->nrg_th_cck);

      cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;

      if (flags & CMD_ASYNC)
            cmd_out.meta.u.callback = iwl_sensitivity_callback;

      /* Don't send command to uCode if nothing has changed */
      if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
                sizeof(u16)*HD_TABLE_SIZE)) {
            IWL_DEBUG_CALIB("No change in SENSITIVITY_CMD\n");
            return 0;
      }

      /* Copy table for comparison next time */
      memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
             sizeof(u16)*HD_TABLE_SIZE);

      rc = iwl_send_cmd(priv, &cmd_out);
      if (!rc) {
            IWL_DEBUG_CALIB("SENSITIVITY_CMD succeeded\n");
            return rc;
      }

      return 0;
}

void iwl4965_init_sensitivity(struct iwl_priv *priv, u8 flags, u8 force)
{
      int rc = 0;
      int i;
      struct iwl_sensitivity_data *data = NULL;

      IWL_DEBUG_CALIB("Start iwl4965_init_sensitivity\n");

      if (force)
            memset(&(priv->sensitivity_tbl[0]), 0,
                  sizeof(u16)*HD_TABLE_SIZE);

      /* Clear driver's sensitivity algo data */
      data = &(priv->sensitivity_data);
      memset(data, 0, sizeof(struct iwl_sensitivity_data));

      data->num_in_cck_no_fa = 0;
      data->nrg_curr_state = IWL_FA_TOO_MANY;
      data->nrg_prev_state = IWL_FA_TOO_MANY;
      data->nrg_silence_ref = 0;
      data->nrg_silence_idx = 0;
      data->nrg_energy_idx = 0;

      for (i = 0; i < 10; i++)
            data->nrg_value[i] = 0;

      for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
            data->nrg_silence_rssi[i] = 0;

      data->auto_corr_ofdm = 90;
      data->auto_corr_ofdm_mrc = 170;
      data->auto_corr_ofdm_x1  = 105;
      data->auto_corr_ofdm_mrc_x1 = 220;
      data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
      data->auto_corr_cck_mrc = 200;
      data->nrg_th_cck = 100;
      data->nrg_th_ofdm = 100;

      data->last_bad_plcp_cnt_ofdm = 0;
      data->last_fa_cnt_ofdm = 0;
      data->last_bad_plcp_cnt_cck = 0;
      data->last_fa_cnt_cck = 0;

      /* Clear prior Sensitivity command data to force send to uCode */
      if (force)
            memset(&(priv->sensitivity_tbl[0]), 0,
                sizeof(u16)*HD_TABLE_SIZE);

      rc |= iwl4965_sensitivity_write(priv, flags);
      IWL_DEBUG_CALIB("<<return 0x%X\n", rc);

      return;
}


/* Reset differential Rx gains in NIC to prepare for chain noise calibration.
 * Called after every association, but this runs only once!
 *  ... once chain noise is calibrated the first time, it's good forever.  */
void iwl4965_chain_noise_reset(struct iwl_priv *priv)
{
      struct iwl_chain_noise_data *data = NULL;
      int rc = 0;

      data = &(priv->chain_noise_data);
      if ((data->state == IWL_CHAIN_NOISE_ALIVE) && iwl_is_associated(priv)) {
            struct iwl_calibration_cmd cmd;

            memset(&cmd, 0, sizeof(cmd));
            cmd.opCode = PHY_CALIBRATE_DIFF_GAIN_CMD;
            cmd.diff_gain_a = 0;
            cmd.diff_gain_b = 0;
            cmd.diff_gain_c = 0;
            rc = iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
                         sizeof(cmd), &cmd);
            msleep(4);
            data->state = IWL_CHAIN_NOISE_ACCUMULATE;
            IWL_DEBUG_CALIB("Run chain_noise_calibrate\n");
      }
      return;
}

/*
 * Accumulate 20 beacons of signal and noise statistics for each of
 *   3 receivers/antennas/rx-chains, then figure out:
 * 1)  Which antennas are connected.
 * 2)  Differential rx gain settings to balance the 3 receivers.
 */
static void iwl4965_noise_calibration(struct iwl_priv *priv,
                              struct iwl_notif_statistics *stat_resp)
{
      struct iwl_chain_noise_data *data = NULL;
      int rc = 0;

      u32 chain_noise_a;
      u32 chain_noise_b;
      u32 chain_noise_c;
      u32 chain_sig_a;
      u32 chain_sig_b;
      u32 chain_sig_c;
      u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
      u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
      u32 max_average_sig;
      u16 max_average_sig_antenna_i;
      u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
      u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
      u16 i = 0;
      u16 chan_num = INITIALIZATION_VALUE;
      u32 band = INITIALIZATION_VALUE;
      u32 active_chains = 0;
      unsigned long flags;
      struct statistics_rx_non_phy *rx_info = &(stat_resp->rx.general);

      data = &(priv->chain_noise_data);

      /* Accumulate just the first 20 beacons after the first association,
       *   then we're done forever. */
      if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
            if (data->state == IWL_CHAIN_NOISE_ALIVE)
                  IWL_DEBUG_CALIB("Wait for noise calib reset\n");
            return;
      }

      spin_lock_irqsave(&priv->lock, flags);
      if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
            IWL_DEBUG_CALIB(" << Interference data unavailable\n");
            spin_unlock_irqrestore(&priv->lock, flags);
            return;
      }

      band = (priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK) ? 0 : 1;
      chan_num = le16_to_cpu(priv->staging_rxon.channel);

      /* Make sure we accumulate data for just the associated channel
       *   (even if scanning). */
      if ((chan_num != (le32_to_cpu(stat_resp->flag) >> 16)) ||
          ((STATISTICS_REPLY_FLG_BAND_24G_MSK ==
           (stat_resp->flag & STATISTICS_REPLY_FLG_BAND_24G_MSK)) && band)) {
            IWL_DEBUG_CALIB("Stats not from chan=%d, band=%d\n",
                        chan_num, band);
            spin_unlock_irqrestore(&priv->lock, flags);
            return;
      }

      /* Accumulate beacon statistics values across 20 beacons */
      chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
                        IN_BAND_FILTER;
      chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
                        IN_BAND_FILTER;
      chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
                        IN_BAND_FILTER;

      chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
      chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
      chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;

      spin_unlock_irqrestore(&priv->lock, flags);

      data->beacon_count++;

      data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
      data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
      data->chain_noise_c = (chain_noise_c + data->chain_noise_c);

      data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
      data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
      data->chain_signal_c = (chain_sig_c + data->chain_signal_c);

      IWL_DEBUG_CALIB("chan=%d, band=%d, beacon=%d\n", chan_num, band,
                  data->beacon_count);
      IWL_DEBUG_CALIB("chain_sig: a %d b %d c %d\n",
                  chain_sig_a, chain_sig_b, chain_sig_c);
      IWL_DEBUG_CALIB("chain_noise: a %d b %d c %d\n",
                  chain_noise_a, chain_noise_b, chain_noise_c);

      /* If this is the 20th beacon, determine:
       * 1)  Disconnected antennas (using signal strengths)
       * 2)  Differential gain (using silence noise) to balance receivers */
      if (data->beacon_count == CAL_NUM_OF_BEACONS) {

            /* Analyze signal for disconnected antenna */
            average_sig[0] = (data->chain_signal_a) / CAL_NUM_OF_BEACONS;
            average_sig[1] = (data->chain_signal_b) / CAL_NUM_OF_BEACONS;
            average_sig[2] = (data->chain_signal_c) / CAL_NUM_OF_BEACONS;

            if (average_sig[0] >= average_sig[1]) {
                  max_average_sig = average_sig[0];
                  max_average_sig_antenna_i = 0;
                  active_chains = (1 << max_average_sig_antenna_i);
            } else {
                  max_average_sig = average_sig[1];
                  max_average_sig_antenna_i = 1;
                  active_chains = (1 << max_average_sig_antenna_i);
            }

            if (average_sig[2] >= max_average_sig) {
                  max_average_sig = average_sig[2];
                  max_average_sig_antenna_i = 2;
                  active_chains = (1 << max_average_sig_antenna_i);
            }

            IWL_DEBUG_CALIB("average_sig: a %d b %d c %d\n",
                       average_sig[0], average_sig[1], average_sig[2]);
            IWL_DEBUG_CALIB("max_average_sig = %d, antenna %d\n",
                       max_average_sig, max_average_sig_antenna_i);

            /* Compare signal strengths for all 3 receivers. */
            for (i = 0; i < NUM_RX_CHAINS; i++) {
                  if (i != max_average_sig_antenna_i) {
                        s32 rssi_delta = (max_average_sig -
                                      average_sig[i]);

                        /* If signal is very weak, compared with
                         * strongest, mark it as disconnected. */
                        if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
                              data->disconn_array[i] = 1;
                        else
                              active_chains |= (1 << i);
                  IWL_DEBUG_CALIB("i = %d  rssiDelta = %d  "
                             "disconn_array[i] = %d\n",
                             i, rssi_delta, data->disconn_array[i]);
                  }
            }

            /*If both chains A & B are disconnected -
             * connect B and leave A as is */
            if (data->disconn_array[CHAIN_A] &&
                data->disconn_array[CHAIN_B]) {
                  data->disconn_array[CHAIN_B] = 0;
                  active_chains |= (1 << CHAIN_B);
                  IWL_DEBUG_CALIB("both A & B chains are disconnected! "
                             "W/A - declare B as connected\n");
            }

            IWL_DEBUG_CALIB("active_chains (bitwise) = 0x%x\n",
                        active_chains);

            /* Save for use within RXON, TX, SCAN commands, etc. */
            priv->valid_antenna = active_chains;

            /* Analyze noise for rx balance */
            average_noise[0] = ((data->chain_noise_a)/CAL_NUM_OF_BEACONS);
            average_noise[1] = ((data->chain_noise_b)/CAL_NUM_OF_BEACONS);
            average_noise[2] = ((data->chain_noise_c)/CAL_NUM_OF_BEACONS);

            for (i = 0; i < NUM_RX_CHAINS; i++) {
                  if (!(data->disconn_array[i]) &&
                     (average_noise[i] <= min_average_noise)) {
                        /* This means that chain i is active and has
                         * lower noise values so far: */
                        min_average_noise = average_noise[i];
                        min_average_noise_antenna_i = i;
                  }
            }

            data->delta_gain_code[min_average_noise_antenna_i] = 0;

            IWL_DEBUG_CALIB("average_noise: a %d b %d c %d\n",
                        average_noise[0], average_noise[1],
                        average_noise[2]);

            IWL_DEBUG_CALIB("min_average_noise = %d, antenna %d\n",
                        min_average_noise, min_average_noise_antenna_i);

            for (i = 0; i < NUM_RX_CHAINS; i++) {
                  s32 delta_g = 0;

                  if (!(data->disconn_array[i]) &&
                      (data->delta_gain_code[i] ==
                       CHAIN_NOISE_DELTA_GAIN_INIT_VAL)) {
                        delta_g = average_noise[i] - min_average_noise;
                        data->delta_gain_code[i] = (u8)((delta_g *
                                                    10) / 15);
                        if (CHAIN_NOISE_MAX_DELTA_GAIN_CODE <
                           data->delta_gain_code[i])
                              data->delta_gain_code[i] =
                                CHAIN_NOISE_MAX_DELTA_GAIN_CODE;

                        data->delta_gain_code[i] =
                              (data->delta_gain_code[i] | (1 << 2));
                  } else
                        data->delta_gain_code[i] = 0;
            }
            IWL_DEBUG_CALIB("delta_gain_codes: a %d b %d c %d\n",
                       data->delta_gain_code[0],
                       data->delta_gain_code[1],
                       data->delta_gain_code[2]);

            /* Differential gain gets sent to uCode only once */
            if (!data->radio_write) {
                  struct iwl_calibration_cmd cmd;
                  data->radio_write = 1;

                  memset(&cmd, 0, sizeof(cmd));
                  cmd.opCode = PHY_CALIBRATE_DIFF_GAIN_CMD;
                  cmd.diff_gain_a = data->delta_gain_code[0];
                  cmd.diff_gain_b = data->delta_gain_code[1];
                  cmd.diff_gain_c = data->delta_gain_code[2];
                  rc = iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
                                    sizeof(cmd), &cmd);
                  if (rc)
                        IWL_DEBUG_CALIB("fail sending cmd "
                                   "REPLY_PHY_CALIBRATION_CMD \n");

                  /* TODO we might want recalculate
                   * rx_chain in rxon cmd */

                  /* Mark so we run this algo only once! */
                  data->state = IWL_CHAIN_NOISE_CALIBRATED;
            }
            data->chain_noise_a = 0;
            data->chain_noise_b = 0;
            data->chain_noise_c = 0;
            data->chain_signal_a = 0;
            data->chain_signal_b = 0;
            data->chain_signal_c = 0;
            data->beacon_count = 0;
      }
      return;
}

static void iwl4965_sensitivity_calibration(struct iwl_priv *priv,
                                  struct iwl_notif_statistics *resp)
{
      int rc = 0;
      u32 rx_enable_time;
      u32 fa_cck;
      u32 fa_ofdm;
      u32 bad_plcp_cck;
      u32 bad_plcp_ofdm;
      u32 norm_fa_ofdm;
      u32 norm_fa_cck;
      struct iwl_sensitivity_data *data = NULL;
      struct statistics_rx_non_phy *rx_info = &(resp->rx.general);
      struct statistics_rx *statistics = &(resp->rx);
      unsigned long flags;
      struct statistics_general_data statis;

      data = &(priv->sensitivity_data);

      if (!iwl_is_associated(priv)) {
            IWL_DEBUG_CALIB("<< - not associated\n");
            return;
      }

      spin_lock_irqsave(&priv->lock, flags);
      if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
            IWL_DEBUG_CALIB("<< invalid data.\n");
            spin_unlock_irqrestore(&priv->lock, flags);
            return;
      }

      /* Extract Statistics: */
      rx_enable_time = le32_to_cpu(rx_info->channel_load);
      fa_cck = le32_to_cpu(statistics->cck.false_alarm_cnt);
      fa_ofdm = le32_to_cpu(statistics->ofdm.false_alarm_cnt);
      bad_plcp_cck = le32_to_cpu(statistics->cck.plcp_err);
      bad_plcp_ofdm = le32_to_cpu(statistics->ofdm.plcp_err);

      statis.beacon_silence_rssi_a =
                  le32_to_cpu(statistics->general.beacon_silence_rssi_a);
      statis.beacon_silence_rssi_b =
                  le32_to_cpu(statistics->general.beacon_silence_rssi_b);
      statis.beacon_silence_rssi_c =
                  le32_to_cpu(statistics->general.beacon_silence_rssi_c);
      statis.beacon_energy_a =
                  le32_to_cpu(statistics->general.beacon_energy_a);
      statis.beacon_energy_b =
                  le32_to_cpu(statistics->general.beacon_energy_b);
      statis.beacon_energy_c =
                  le32_to_cpu(statistics->general.beacon_energy_c);

      spin_unlock_irqrestore(&priv->lock, flags);

      IWL_DEBUG_CALIB("rx_enable_time = %u usecs\n", rx_enable_time);

      if (!rx_enable_time) {
            IWL_DEBUG_CALIB("<< RX Enable Time == 0! \n");
            return;
      }

      /* These statistics increase monotonically, and do not reset
       *   at each beacon.  Calculate difference from last value, or just
       *   use the new statistics value if it has reset or wrapped around. */
      if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
            data->last_bad_plcp_cnt_cck = bad_plcp_cck;
      else {
            bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
            data->last_bad_plcp_cnt_cck += bad_plcp_cck;
      }

      if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
            data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
      else {
            bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
            data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
      }

      if (data->last_fa_cnt_ofdm > fa_ofdm)
            data->last_fa_cnt_ofdm = fa_ofdm;
      else {
            fa_ofdm -= data->last_fa_cnt_ofdm;
            data->last_fa_cnt_ofdm += fa_ofdm;
      }

      if (data->last_fa_cnt_cck > fa_cck)
            data->last_fa_cnt_cck = fa_cck;
      else {
            fa_cck -= data->last_fa_cnt_cck;
            data->last_fa_cnt_cck += fa_cck;
      }

      /* Total aborted signal locks */
      norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
      norm_fa_cck = fa_cck + bad_plcp_cck;

      IWL_DEBUG_CALIB("cck: fa %u badp %u  ofdm: fa %u badp %u\n", fa_cck,
                  bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);

      iwl4965_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
      iwl4965_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
      rc |= iwl4965_sensitivity_write(priv, CMD_ASYNC);

      return;
}

static void iwl4965_bg_sensitivity_work(struct work_struct *work)
{
      struct iwl_priv *priv = container_of(work, struct iwl_priv,
                  sensitivity_work);

      mutex_lock(&priv->mutex);

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

      if (priv->start_calib) {
            iwl4965_noise_calibration(priv, &priv->statistics);

            if (priv->sensitivity_data.state ==
                              IWL_SENS_CALIB_NEED_REINIT) {
                  iwl4965_init_sensitivity(priv, CMD_ASYNC, 0);
                  priv->sensitivity_data.state = IWL_SENS_CALIB_ALLOWED;
            } else
                  iwl4965_sensitivity_calibration(priv,
                              &priv->statistics);
      }

      mutex_unlock(&priv->mutex);
      return;
}
#endif /*CONFIG_IWLWIFI_SENSITIVITY*/

static void iwl4965_bg_txpower_work(struct work_struct *work)
{
      struct iwl_priv *priv = container_of(work, struct iwl_priv,
                  txpower_work);

      /* If a scan happened to start before we got here
       * then just return; the statistics notification will
       * kick off another scheduled work to compensate for
       * any temperature delta we missed here. */
      if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
          test_bit(STATUS_SCANNING, &priv->status))
            return;

      mutex_lock(&priv->mutex);

      /* Regardless of if we are assocaited, we must reconfigure the
       * TX power since frames can be sent on non-radar channels while
       * not associated */
      iwl_hw_reg_send_txpower(priv);

      /* Update last_temperature to keep is_calib_needed from running
       * when it isn't needed... */
      priv->last_temperature = priv->temperature;

      mutex_unlock(&priv->mutex);
}

/*
 * Acquire priv->lock before calling this function !
 */
static void iwl4965_set_wr_ptrs(struct iwl_priv *priv, int txq_id, u32 index)
{
      iwl_write_restricted(priv, HBUS_TARG_WRPTR,
                       (index & 0xff) | (txq_id << 8));
      iwl_write_restricted_reg(priv, SCD_QUEUE_RDPTR(txq_id), index);
}

/*
 * Acquire priv->lock before calling this function !
 */
static void iwl4965_tx_queue_set_status(struct iwl_priv *priv,
                              struct iwl_tx_queue *txq,
                              int tx_fifo_id, int scd_retry)
{
      int txq_id = txq->q.id;
      int active = test_bit(txq_id, &priv->txq_ctx_active_msk)?1:0;

      iwl_write_restricted_reg(priv, SCD_QUEUE_STATUS_BITS(txq_id),
                         (active << SCD_QUEUE_STTS_REG_POS_ACTIVE) |
                         (tx_fifo_id << SCD_QUEUE_STTS_REG_POS_TXF) |
                         (scd_retry << SCD_QUEUE_STTS_REG_POS_WSL) |
                         (scd_retry << SCD_QUEUE_STTS_REG_POS_SCD_ACK) |
                         SCD_QUEUE_STTS_REG_MSK);

      txq->sched_retry = scd_retry;

      IWL_DEBUG_INFO("%s %s Queue %d on AC %d\n",
                   active ? "Activete" : "Deactivate",
                   scd_retry ? "BA" : "AC", txq_id, tx_fifo_id);
}

static const u16 default_queue_to_tx_fifo[] = {
      IWL_TX_FIFO_AC3,
      IWL_TX_FIFO_AC2,
      IWL_TX_FIFO_AC1,
      IWL_TX_FIFO_AC0,
      IWL_CMD_FIFO_NUM,
      IWL_TX_FIFO_HCCA_1,
      IWL_TX_FIFO_HCCA_2
};

static inline void iwl4965_txq_ctx_activate(struct iwl_priv *priv, int txq_id)
{
      set_bit(txq_id, &priv->txq_ctx_active_msk);
}

static inline void iwl4965_txq_ctx_deactivate(struct iwl_priv *priv, int txq_id)
{
      clear_bit(txq_id, &priv->txq_ctx_active_msk);
}

int iwl4965_alive_notify(struct iwl_priv *priv)
{
      u32 a;
      int i = 0;
      unsigned long flags;
      int rc;

      spin_lock_irqsave(&priv->lock, flags);

#ifdef CONFIG_IWLWIFI_SENSITIVITY
      memset(&(priv->sensitivity_data), 0,
             sizeof(struct iwl_sensitivity_data));
      memset(&(priv->chain_noise_data), 0,
             sizeof(struct iwl_chain_noise_data));
      for (i = 0; i < NUM_RX_CHAINS; i++)
            priv->chain_noise_data.delta_gain_code[i] =
                        CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
#endif /* CONFIG_IWLWIFI_SENSITIVITY*/
      rc = iwl_grab_restricted_access(priv);
      if (rc) {
            spin_unlock_irqrestore(&priv->lock, flags);
            return rc;
      }

      priv->scd_base_addr = iwl_read_restricted_reg(priv, SCD_SRAM_BASE_ADDR);
      a = priv->scd_base_addr + SCD_CONTEXT_DATA_OFFSET;
      for (; a < priv->scd_base_addr + SCD_TX_STTS_BITMAP_OFFSET; a += 4)
            iwl_write_restricted_mem(priv, a, 0);
      for (; a < priv->scd_base_addr + SCD_TRANSLATE_TBL_OFFSET; a += 4)
            iwl_write_restricted_mem(priv, a, 0);
      for (; a < sizeof(u16) * priv->hw_setting.max_txq_num; a += 4)
            iwl_write_restricted_mem(priv, a, 0);

      iwl_write_restricted_reg(priv, SCD_DRAM_BASE_ADDR,
            (priv->hw_setting.shared_phys +
             offsetof(struct iwl_shared, queues_byte_cnt_tbls)) >> 10);
      iwl_write_restricted_reg(priv, SCD_QUEUECHAIN_SEL, 0);

      /* initiate the queues */
      for (i = 0; i < priv->hw_setting.max_txq_num; i++) {
            iwl_write_restricted_reg(priv, SCD_QUEUE_RDPTR(i), 0);
            iwl_write_restricted(priv, HBUS_TARG_WRPTR, 0 | (i << 8));
            iwl_write_restricted_mem(priv, priv->scd_base_addr +
                              SCD_CONTEXT_QUEUE_OFFSET(i),
                              (SCD_WIN_SIZE <<
                              SCD_QUEUE_CTX_REG1_WIN_SIZE_POS) &
                              SCD_QUEUE_CTX_REG1_WIN_SIZE_MSK);
            iwl_write_restricted_mem(priv, priv->scd_base_addr +
                              SCD_CONTEXT_QUEUE_OFFSET(i) +
                              sizeof(u32),
                              (SCD_FRAME_LIMIT <<
                              SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
                              SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK);

      }
      iwl_write_restricted_reg(priv, SCD_INTERRUPT_MASK,
                         (1 << priv->hw_setting.max_txq_num) - 1);

      iwl_write_restricted_reg(priv, SCD_TXFACT,
                         SCD_TXFACT_REG_TXFIFO_MASK(0, 7));

      iwl4965_set_wr_ptrs(priv, IWL_CMD_QUEUE_NUM, 0);
      /* map qos queues to fifos one-to-one */
      for (i = 0; i < ARRAY_SIZE(default_queue_to_tx_fifo); i++) {
            int ac = default_queue_to_tx_fifo[i];
            iwl4965_txq_ctx_activate(priv, i);
            iwl4965_tx_queue_set_status(priv, &priv->txq[i], ac, 0);
      }

      iwl_release_restricted_access(priv);
      spin_unlock_irqrestore(&priv->lock, flags);

      return 0;
}

int iwl_hw_set_hw_setting(struct iwl_priv *priv)
{
      priv->hw_setting.shared_virt =
          pci_alloc_consistent(priv->pci_dev,
                         sizeof(struct iwl_shared),
                         &priv->hw_setting.shared_phys);

      if (!priv->hw_setting.shared_virt)
            return -1;

      memset(priv->hw_setting.shared_virt, 0, sizeof(struct iwl_shared));

      priv->hw_setting.max_txq_num = iwl_param_queues_num;
      priv->hw_setting.ac_queue_count = AC_NUM;

      priv->hw_setting.cck_flag = RATE_MCS_CCK_MSK;
      priv->hw_setting.tx_cmd_len = sizeof(struct iwl_tx_cmd);
      priv->hw_setting.max_rxq_size = RX_QUEUE_SIZE;
      priv->hw_setting.max_rxq_log = RX_QUEUE_SIZE_LOG;

      priv->hw_setting.max_stations = IWL4965_STATION_COUNT;
      priv->hw_setting.bcast_sta_id = IWL4965_BROADCAST_ID;
      return 0;
}

/**
 * iwl_hw_txq_ctx_free - Free TXQ Context
 *
 * Destroy all TX DMA queues and structures
 */
void iwl_hw_txq_ctx_free(struct iwl_priv *priv)
{
      int txq_id;

      /* Tx queues */
      for (txq_id = 0; txq_id < priv->hw_setting.max_txq_num; txq_id++)
            iwl_tx_queue_free(priv, &priv->txq[txq_id]);

      iwl4965_kw_free(priv);
}

/**
 * iwl_hw_txq_free_tfd -  Free one TFD, those at index [txq->q.last_used]
 *
 * Does NOT advance any indexes
 */
int iwl_hw_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq)
{
      struct iwl_tfd_frame *bd_tmp = (struct iwl_tfd_frame *)&txq->bd[0];
      struct iwl_tfd_frame *bd = &bd_tmp[txq->q.last_used];
      struct pci_dev *dev = priv->pci_dev;
      int i;
      int counter = 0;
      int index, is_odd;

      /* classify bd */
      if (txq->q.id == IWL_CMD_QUEUE_NUM)
            /* nothing to cleanup after for host commands */
            return 0;

      /* sanity check */
      counter = IWL_GET_BITS(*bd, num_tbs);
      if (counter > MAX_NUM_OF_TBS) {
            IWL_ERROR("Too many chunks: %i\n", counter);
            /* @todo issue fatal error, it is quite serious situation */
            return 0;
      }

      /* unmap chunks if any */

      for (i = 0; i < counter; i++) {
            index = i / 2;
            is_odd = i & 0x1;

            if (is_odd)
                  pci_unmap_single(
                        dev,
                        IWL_GET_BITS(bd->pa[index], tb2_addr_lo16) |
                        (IWL_GET_BITS(bd->pa[index],
                                    tb2_addr_hi20) << 16),
                        IWL_GET_BITS(bd->pa[index], tb2_len),
                        PCI_DMA_TODEVICE);

            else if (i > 0)
                  pci_unmap_single(dev,
                               le32_to_cpu(bd->pa[index].tb1_addr),
                               IWL_GET_BITS(bd->pa[index], tb1_len),
                               PCI_DMA_TODEVICE);

            if (txq->txb[txq->q.last_used].skb[i]) {
                  struct sk_buff *skb = txq->txb[txq->q.last_used].skb[i];

                  dev_kfree_skb(skb);
                  txq->txb[txq->q.last_used].skb[i] = NULL;
            }
      }
      return 0;
}

int iwl_hw_reg_set_txpower(struct iwl_priv *priv, s8 power)
{
      IWL_ERROR("TODO: Implement iwl_hw_reg_set_txpower!\n");
      return -EINVAL;
}

static s32 iwl4965_math_div_round(s32 num, s32 denom, s32 *res)
{
      s32 sign = 1;

      if (num < 0) {
            sign = -sign;
            num = -num;
      }
      if (denom < 0) {
            sign = -sign;
            denom = -denom;
      }
      *res = 1;
      *res = ((num * 2 + denom) / (denom * 2)) * sign;

      return 1;
}

static s32 iwl4965_get_voltage_compensation(s32 eeprom_voltage,
                                  s32 current_voltage)
{
      s32 comp = 0;

      if ((TX_POWER_IWL_ILLEGAL_VOLTAGE == eeprom_voltage) ||
          (TX_POWER_IWL_ILLEGAL_VOLTAGE == current_voltage))
            return 0;

      iwl4965_math_div_round(current_voltage - eeprom_voltage,
                         TX_POWER_IWL_VOLTAGE_CODES_PER_03V, &comp);

      if (current_voltage > eeprom_voltage)
            comp *= 2;
      if ((comp < -2) || (comp > 2))
            comp = 0;

      return comp;
}

static const struct iwl_channel_info *
iwl4965_get_channel_txpower_info(struct iwl_priv *priv, u8 phymode, u16 channel)
{
      const struct iwl_channel_info *ch_info;

      ch_info = iwl_get_channel_info(priv, phymode, channel);

      if (!is_channel_valid(ch_info))
            return NULL;

      return ch_info;
}

static s32 iwl4965_get_tx_atten_grp(u16 channel)
{
      if (channel >= CALIB_IWL_TX_ATTEN_GR5_FCH &&
          channel <= CALIB_IWL_TX_ATTEN_GR5_LCH)
            return CALIB_CH_GROUP_5;

      if (channel >= CALIB_IWL_TX_ATTEN_GR1_FCH &&
          channel <= CALIB_IWL_TX_ATTEN_GR1_LCH)
            return CALIB_CH_GROUP_1;

      if (channel >= CALIB_IWL_TX_ATTEN_GR2_FCH &&
          channel <= CALIB_IWL_TX_ATTEN_GR2_LCH)
            return CALIB_CH_GROUP_2;

      if (channel >= CALIB_IWL_TX_ATTEN_GR3_FCH &&
          channel <= CALIB_IWL_TX_ATTEN_GR3_LCH)
            return CALIB_CH_GROUP_3;

      if (channel >= CALIB_IWL_TX_ATTEN_GR4_FCH &&
          channel <= CALIB_IWL_TX_ATTEN_GR4_LCH)
            return CALIB_CH_GROUP_4;

      IWL_ERROR("Can't find txatten group for channel %d.\n", channel);
      return -1;
}

static u32 iwl4965_get_sub_band(const struct iwl_priv *priv, u32 channel)
{
      s32 b = -1;

      for (b = 0; b < EEPROM_TX_POWER_BANDS; b++) {
            if (priv->eeprom.calib_info.band_info[b].ch_from == 0)
                  continue;

            if ((channel >= priv->eeprom.calib_info.band_info[b].ch_from)
                && (channel <= priv->eeprom.calib_info.band_info[b].ch_to))
                  break;
      }

      return b;
}

static s32 iwl4965_interpolate_value(s32 x, s32 x1, s32 y1, s32 x2, s32 y2)
{
      s32 val;

      if (x2 == x1)
            return y1;
      else {
            iwl4965_math_div_round((x2 - x) * (y1 - y2), (x2 - x1), &val);
            return val + y2;
      }
}

static int iwl4965_interpolate_chan(struct iwl_priv *priv, u32 channel,
                            struct iwl_eeprom_calib_ch_info *chan_info)
{
      s32 s = -1;
      u32 c;
      u32 m;
      const struct iwl_eeprom_calib_measure *m1;
      const struct iwl_eeprom_calib_measure *m2;
      struct iwl_eeprom_calib_measure *omeas;
      u32 ch_i1;
      u32 ch_i2;

      s = iwl4965_get_sub_band(priv, channel);
      if (s >= EEPROM_TX_POWER_BANDS) {
            IWL_ERROR("Tx Power can not find channel %d ", channel);
            return -1;
      }

      ch_i1 = priv->eeprom.calib_info.band_info[s].ch1.ch_num;
      ch_i2 = priv->eeprom.calib_info.band_info[s].ch2.ch_num;
      chan_info->ch_num = (u8) channel;

      IWL_DEBUG_TXPOWER("channel %d subband %d factory cal ch %d & %d\n",
                    channel, s, ch_i1, ch_i2);

      for (c = 0; c < EEPROM_TX_POWER_TX_CHAINS; c++) {
            for (m = 0; m < EEPROM_TX_POWER_MEASUREMENTS; m++) {
                  m1 = &(priv->eeprom.calib_info.band_info[s].ch1.
                         measurements[c][m]);
                  m2 = &(priv->eeprom.calib_info.band_info[s].ch2.
                         measurements[c][m]);
                  omeas = &(chan_info->measurements[c][m]);

                  omeas->actual_pow =
                      (u8) iwl4965_interpolate_value(channel, ch_i1,
                                             m1->actual_pow,
                                             ch_i2,
                                             m2->actual_pow);
                  omeas->gain_idx =
                      (u8) iwl4965_interpolate_value(channel, ch_i1,
                                             m1->gain_idx, ch_i2,
                                             m2->gain_idx);
                  omeas->temperature =
                      (u8) iwl4965_interpolate_value(channel, ch_i1,
                                             m1->temperature,
                                             ch_i2,
                                             m2->temperature);
                  omeas->pa_det =
                      (s8) iwl4965_interpolate_value(channel, ch_i1,
                                             m1->pa_det, ch_i2,
                                             m2->pa_det);

                  IWL_DEBUG_TXPOWER
                      ("chain %d meas %d AP1=%d AP2=%d AP=%d\n", c, m,
                       m1->actual_pow, m2->actual_pow, omeas->actual_pow);
                  IWL_DEBUG_TXPOWER
                      ("chain %d meas %d NI1=%d NI2=%d NI=%d\n", c, m,
                       m1->gain_idx, m2->gain_idx, omeas->gain_idx);
                  IWL_DEBUG_TXPOWER
                      ("chain %d meas %d PA1=%d PA2=%d PA=%d\n", c, m,
                       m1->pa_det, m2->pa_det, omeas->pa_det);
                  IWL_DEBUG_TXPOWER
                      ("chain %d meas %d  T1=%d  T2=%d  T=%d\n", c, m,
                       m1->temperature, m2->temperature,
                       omeas->temperature);
            }
      }

      return 0;
}

/* bit-rate-dependent table to prevent Tx distortion, in half-dB units,
 * for OFDM 6, 12, 18, 24, 36, 48, 54, 60 MBit, and CCK all rates. */
static s32 back_off_table[] = {
      10, 10, 10, 10, 10, 15, 17, 20,     /* OFDM SISO 20 MHz */
      10, 10, 10, 10, 10, 15, 17, 20,     /* OFDM MIMO 20 MHz */
      10, 10, 10, 10, 10, 15, 17, 20,     /* OFDM SISO 40 MHz */
      10, 10, 10, 10, 10, 15, 17, 20,     /* OFDM MIMO 40 MHz */
      10                /* CCK */
};

/* Thermal compensation values for txpower for various frequency ranges ...
 *   ratios from 3:1 to 4.5:1 of degrees (Celsius) per half-dB gain adjust */
static struct iwl_txpower_comp_entry {
      s32 degrees_per_05db_a;
      s32 degrees_per_05db_a_denom;
} tx_power_cmp_tble[CALIB_CH_GROUP_MAX] = {
      {9, 2},                 /* group 0 5.2, ch  34-43 */
      {4, 1},                 /* group 1 5.2, ch  44-70 */
      {4, 1},                 /* group 2 5.2, ch  71-124 */
      {4, 1},                 /* group 3 5.2, ch 125-200 */
      {3, 1}                  /* group 4 2.4, ch   all */
};

static s32 get_min_power_index(s32 rate_power_index, u32 band)
{
      if (!band) {
            if ((rate_power_index & 7) <= 4)
                  return MIN_TX_GAIN_INDEX_52GHZ_EXT;
      }
      return MIN_TX_GAIN_INDEX;
}

struct gain_entry {
      u8 dsp;
      u8 radio;
};

static const struct gain_entry gain_table[2][108] = {
      /* 5.2GHz power gain index table */
      {
       {123, 0x3F},           /* highest txpower */
       {117, 0x3F},
       {110, 0x3F},
       {104, 0x3F},
       {98, 0x3F},
       {110, 0x3E},
       {104, 0x3E},
       {98, 0x3E},
       {110, 0x3D},
       {104, 0x3D},
       {98, 0x3D},
       {110, 0x3C},
       {104, 0x3C},
       {98, 0x3C},
       {110, 0x3B},
       {104, 0x3B},
       {98, 0x3B},
       {110, 0x3A},
       {104, 0x3A},
       {98, 0x3A},
       {110, 0x39},
       {104, 0x39},
       {98, 0x39},
       {110, 0x38},
       {104, 0x38},
       {98, 0x38},
       {110, 0x37},
       {104, 0x37},
       {98, 0x37},
       {110, 0x36},
       {104, 0x36},
       {98, 0x36},
       {110, 0x35},
       {104, 0x35},
       {98, 0x35},
       {110, 0x34},
       {104, 0x34},
       {98, 0x34},
       {110, 0x33},
       {104, 0x33},
       {98, 0x33},
       {110, 0x32},
       {104, 0x32},
       {98, 0x32},
       {110, 0x31},
       {104, 0x31},
       {98, 0x31},
       {110, 0x30},
       {104, 0x30},
       {98, 0x30},
       {110, 0x25},
       {104, 0x25},
       {98, 0x25},
       {110, 0x24},
       {104, 0x24},
       {98, 0x24},
       {110, 0x23},
       {104, 0x23},
       {98, 0x23},
       {110, 0x22},
       {104, 0x18},
       {98, 0x18},
       {110, 0x17},
       {104, 0x17},
       {98, 0x17},
       {110, 0x16},
       {104, 0x16},
       {98, 0x16},
       {110, 0x15},
       {104, 0x15},
       {98, 0x15},
       {110, 0x14},
       {104, 0x14},
       {98, 0x14},
       {110, 0x13},
       {104, 0x13},
       {98, 0x13},
       {110, 0x12},
       {104, 0x08},
       {98, 0x08},
       {110, 0x07},
       {104, 0x07},
       {98, 0x07},
       {110, 0x06},
       {104, 0x06},
       {98, 0x06},
       {110, 0x05},
       {104, 0x05},
       {98, 0x05},
       {110, 0x04},
       {104, 0x04},
       {98, 0x04},
       {110, 0x03},
       {104, 0x03},
       {98, 0x03},
       {110, 0x02},
       {104, 0x02},
       {98, 0x02},
       {110, 0x01},
       {104, 0x01},
       {98, 0x01},
       {110, 0x00},
       {104, 0x00},
       {98, 0x00},
       {93, 0x00},
       {88, 0x00},
       {83, 0x00},
       {78, 0x00},
       },
      /* 2.4GHz power gain index table */
      {
       {110, 0x3f},           /* highest txpower */
       {104, 0x3f},
       {98, 0x3f},
       {110, 0x3e},
       {104, 0x3e},
       {98, 0x3e},
       {110, 0x3d},
       {104, 0x3d},
       {98, 0x3d},
       {110, 0x3c},
       {104, 0x3c},
       {98, 0x3c},
       {110, 0x3b},
       {104, 0x3b},
       {98, 0x3b},
       {110, 0x3a},
       {104, 0x3a},
       {98, 0x3a},
       {110, 0x39},
       {104, 0x39},
       {98, 0x39},
       {110, 0x38},
       {104, 0x38},
       {98, 0x38},
       {110, 0x37},
       {104, 0x37},
       {98, 0x37},
       {110, 0x36},
       {104, 0x36},
       {98, 0x36},
       {110, 0x35},
       {104, 0x35},
       {98, 0x35},
       {110, 0x34},
       {104, 0x34},
       {98, 0x34},
       {110, 0x33},
       {104, 0x33},
       {98, 0x33},
       {110, 0x32},
       {104, 0x32},
       {98, 0x32},
       {110, 0x31},
       {104, 0x31},
       {98, 0x31},
       {110, 0x30},
       {104, 0x30},
       {98, 0x30},
       {110, 0x6},
       {104, 0x6},
       {98, 0x6},
       {110, 0x5},
       {104, 0x5},
       {98, 0x5},
       {110, 0x4},
       {104, 0x4},
       {98, 0x4},
       {110, 0x3},
       {104, 0x3},
       {98, 0x3},
       {110, 0x2},
       {104, 0x2},
       {98, 0x2},
       {110, 0x1},
       {104, 0x1},
       {98, 0x1},
       {110, 0x0},
       {104, 0x0},
       {98, 0x0},
       {97, 0},
       {96, 0},
       {95, 0},
       {94, 0},
       {93, 0},
       {92, 0},
       {91, 0},
       {90, 0},
       {89, 0},
       {88, 0},
       {87, 0},
       {86, 0},
       {85, 0},
       {84, 0},
       {83, 0},
       {82, 0},
       {81, 0},
       {80, 0},
       {79, 0},
       {78, 0},
       {77, 0},
       {76, 0},
       {75, 0},
       {74, 0},
       {73, 0},
       {72, 0},
       {71, 0},
       {70, 0},
       {69, 0},
       {68, 0},
       {67, 0},
       {66, 0},
       {65, 0},
       {64, 0},
       {63, 0},
       {62, 0},
       {61, 0},
       {60, 0},
       {59, 0},
       }
};

static int iwl4965_fill_txpower_tbl(struct iwl_priv *priv, u8 band, u16 channel,
                            u8 is_fat, u8 ctrl_chan_high,
                            struct iwl_tx_power_db *tx_power_tbl)
{
      u8 saturation_power;
      s32 target_power;
      s32 user_target_power;
      s32 power_limit;
      s32 current_temp;
      s32 reg_limit;
      s32 current_regulatory;
      s32 txatten_grp = CALIB_CH_GROUP_MAX;
      int i;
      int c;
      const struct iwl_channel_info *ch_info = NULL;
      struct iwl_eeprom_calib_ch_info ch_eeprom_info;
      const struct iwl_eeprom_calib_measure *measurement;
      s16 voltage;
      s32 init_voltage;
      s32 voltage_compensation;
      s32 degrees_per_05db_num;
      s32 degrees_per_05db_denom;
      s32 factory_temp;
      s32 temperature_comp[2];
      s32 factory_gain_index[2];
      s32 factory_actual_pwr[2];
      s32 power_index;

      /* Sanity check requested level (dBm) */
      if (priv->user_txpower_limit < IWL_TX_POWER_TARGET_POWER_MIN) {
            IWL_WARNING("Requested user TXPOWER %d below limit.\n",
                      priv->user_txpower_limit);
            return -EINVAL;
      }
      if (priv->user_txpower_limit > IWL_TX_POWER_TARGET_POWER_MAX) {
            IWL_WARNING("Requested user TXPOWER %d above limit.\n",
                      priv->user_txpower_limit);
            return -EINVAL;
      }

      /* user_txpower_limit is in dBm, convert to half-dBm (half-dB units
       *   are used for indexing into txpower table) */
      user_target_power = 2 * priv->user_txpower_limit;

      /* Get current (RXON) channel, band, width */
      ch_info =
            iwl4965_get_channel_txpower_info(priv, priv->phymode, channel);

      IWL_DEBUG_TXPOWER("chan %d band %d is_fat %d\n", channel, band,
                    is_fat);

      if (!ch_info)
            return -EINVAL;

      /* get txatten group, used to select 1) thermal txpower adjustment
       *   and 2) mimo txpower balance between Tx chains. */
      txatten_grp = iwl4965_get_tx_atten_grp(channel);
      if (txatten_grp < 0)
            return -EINVAL;

      IWL_DEBUG_TXPOWER("channel %d belongs to txatten group %d\n",
                    channel, txatten_grp);

      if (is_fat) {
            if (ctrl_chan_high)
                  channel -= 2;
            else
                  channel += 2;
      }

      /* hardware txpower limits ...
       * saturation (clipping distortion) txpowers are in half-dBm */
      if (band)
            saturation_power = priv->eeprom.calib_info.saturation_power24;
      else
            saturation_power = priv->eeprom.calib_info.saturation_power52;

      if (saturation_power < IWL_TX_POWER_SATURATION_MIN ||
          saturation_power > IWL_TX_POWER_SATURATION_MAX) {
            if (band)
                  saturation_power = IWL_TX_POWER_DEFAULT_SATURATION_24;
            else
                  saturation_power = IWL_TX_POWER_DEFAULT_SATURATION_52;
      }

      /* regulatory txpower limits ... reg_limit values are in half-dBm,
       *   max_power_avg values are in dBm, convert * 2 */
      if (is_fat)
            reg_limit = ch_info->fat_max_power_avg * 2;
      else
            reg_limit = ch_info->max_power_avg * 2;

      if ((reg_limit < IWL_TX_POWER_REGULATORY_MIN) ||
          (reg_limit > IWL_TX_POWER_REGULATORY_MAX)) {
            if (band)
                  reg_limit = IWL_TX_POWER_DEFAULT_REGULATORY_24;
            else
                  reg_limit = IWL_TX_POWER_DEFAULT_REGULATORY_52;
      }

      /* Interpolate txpower calibration values for this channel,
       *   based on factory calibration tests on spaced channels. */
      iwl4965_interpolate_chan(priv, channel, &ch_eeprom_info);

      /* calculate tx gain adjustment based on power supply voltage */
      voltage = priv->eeprom.calib_info.voltage;
      init_voltage = (s32)le32_to_cpu(priv->card_alive_init.voltage);
      voltage_compensation =
          iwl4965_get_voltage_compensation(voltage, init_voltage);

      IWL_DEBUG_TXPOWER("curr volt %d eeprom volt %d volt comp %d\n",
                    init_voltage,
                    voltage, voltage_compensation);

      /* get current temperature (Celsius) */
      current_temp = max(priv->temperature, IWL_TX_POWER_TEMPERATURE_MIN);
      current_temp = min(priv->temperature, IWL_TX_POWER_TEMPERATURE_MAX);
      current_temp = KELVIN_TO_CELSIUS(current_temp);

      /* select thermal txpower adjustment params, based on channel group
       *   (same frequency group used for mimo txatten adjustment) */
      degrees_per_05db_num =
          tx_power_cmp_tble[txatten_grp].degrees_per_05db_a;
      degrees_per_05db_denom =
          tx_power_cmp_tble[txatten_grp].degrees_per_05db_a_denom;

      /* get per-chain txpower values from factory measurements */
      for (c = 0; c < 2; c++) {
            measurement = &ch_eeprom_info.measurements[c][1];

            /* txgain adjustment (in half-dB steps) based on difference
             *   between factory and current temperature */
            factory_temp = measurement->temperature;
            iwl4965_math_div_round((current_temp - factory_temp) *
                               degrees_per_05db_denom,
                               degrees_per_05db_num,
                               &temperature_comp[c]);

            factory_gain_index[c] = measurement->gain_idx;
            factory_actual_pwr[c] = measurement->actual_pow;

            IWL_DEBUG_TXPOWER("chain = %d\n", c);
            IWL_DEBUG_TXPOWER("fctry tmp %d, "
                          "curr tmp %d, comp %d steps\n",
                          factory_temp, current_temp,
                          temperature_comp[c]);

            IWL_DEBUG_TXPOWER("fctry idx %d, fctry pwr %d\n",
                          factory_gain_index[c],
                          factory_actual_pwr[c]);
      }

      /* for each of 33 bit-rates (including 1 for CCK) */
      for (i = 0; i < POWER_TABLE_NUM_ENTRIES; i++) {
            u8 is_mimo_rate;
            union iwl_tx_power_dual_stream tx_power;

            /* for mimo, reduce each chain's txpower by half
             * (3dB, 6 steps), so total output power is regulatory
             * compliant. */
            if (i & 0x8) {
                  current_regulatory = reg_limit -
                      IWL_TX_POWER_MIMO_REGULATORY_COMPENSATION;
                  is_mimo_rate = 1;
            } else {
                  current_regulatory = reg_limit;
                  is_mimo_rate = 0;
            }

            /* find txpower limit, either hardware or regulatory */
            power_limit = saturation_power - back_off_table[i];
            if (power_limit > current_regulatory)
                  power_limit = current_regulatory;

            /* reduce user's txpower request if necessary
             * for this rate on this channel */
            target_power = user_target_power;
            if (target_power > power_limit)
                  target_power = power_limit;

            IWL_DEBUG_TXPOWER("rate %d sat %d reg %d usr %d tgt %d\n",
                          i, saturation_power - back_off_table[i],
                          current_regulatory, user_target_power,
                          target_power);

            /* for each of 2 Tx chains (radio transmitters) */
            for (c = 0; c < 2; c++) {
                  s32 atten_value;

                  if (is_mimo_rate)
                        atten_value =
                            (s32)le32_to_cpu(priv->card_alive_init.
                            tx_atten[txatten_grp][c]);
                  else
                        atten_value = 0;

                  /* calculate index; higher index means lower txpower */
                  power_index = (u8) (factory_gain_index[c] -
                                  (target_power -
                                   factory_actual_pwr[c]) -
                                  temperature_comp[c] -
                                  voltage_compensation +
                                  atten_value);

/*                IWL_DEBUG_TXPOWER("calculated txpower index %d\n",
                                    power_index); */

                  if (power_index < get_min_power_index(i, band))
                        power_index = get_min_power_index(i, band);

                  /* adjust 5 GHz index to support negative indexes */
                  if (!band)
                        power_index += 9;

                  /* CCK, rate 32, reduce txpower for CCK */
                  if (i == POWER_TABLE_CCK_ENTRY)
                        power_index +=
                            IWL_TX_POWER_CCK_COMPENSATION_C_STEP;

                  /* stay within the table! */
                  if (power_index > 107) {
                        IWL_WARNING("txpower index %d > 107\n",
                                  power_index);
                        power_index = 107;
                  }
                  if (power_index < 0) {
                        IWL_WARNING("txpower index %d < 0\n",
                                  power_index);
                        power_index = 0;
                  }

                  /* fill txpower command for this rate/chain */
                  tx_power.s.radio_tx_gain[c] =
                        gain_table[band][power_index].radio;
                  tx_power.s.dsp_predis_atten[c] =
                        gain_table[band][power_index].dsp;

                  IWL_DEBUG_TXPOWER("chain %d mimo %d index %d "
                                "gain 0x%02x dsp %d\n",
                                c, atten_value, power_index,
                              tx_power.s.radio_tx_gain[c],
                              tx_power.s.dsp_predis_atten[c]);
            }/* for each chain */

            tx_power_tbl->power_tbl[i].dw = cpu_to_le32(tx_power.dw);

      }/* for each rate */

      return 0;
}

/**
 * iwl_hw_reg_send_txpower - Configure the TXPOWER level user limit
 *
 * Uses the active RXON for channel, band, and characteristics (fat, high)
 * The power limit is taken from priv->user_txpower_limit.
 */
int iwl_hw_reg_send_txpower(struct iwl_priv *priv)
{
      struct iwl_txpowertable_cmd cmd = { 0 };
      int rc = 0;
      u8 band = 0;
      u8 is_fat = 0;
      u8 ctrl_chan_high = 0;

      if (test_bit(STATUS_SCANNING, &priv->status)) {
            /* If this gets hit a lot, switch it to a BUG() and catch
             * the stack trace to find out who is calling this during
             * a scan. */
            IWL_WARNING("TX Power requested while scanning!\n");
            return -EAGAIN;
      }

      band = ((priv->phymode == MODE_IEEE80211B) ||
            (priv->phymode == MODE_IEEE80211G));

      is_fat =  is_fat_channel(priv->active_rxon.flags);

      if (is_fat &&
          (priv->active_rxon.flags & RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK))
            ctrl_chan_high = 1;

      cmd.band = band;
      cmd.channel = priv->active_rxon.channel;

      rc = iwl4965_fill_txpower_tbl(priv, band,
                        le16_to_cpu(priv->active_rxon.channel),
                        is_fat, ctrl_chan_high, &cmd.tx_power);
      if (rc)
            return rc;

      rc = iwl_send_cmd_pdu(priv, REPLY_TX_PWR_TABLE_CMD, sizeof(cmd), &cmd);
      return rc;
}

int iwl_hw_channel_switch(struct iwl_priv *priv, u16 channel)
{
      int rc;
      u8 band = 0;
      u8 is_fat = 0;
      u8 ctrl_chan_high = 0;
      struct iwl_channel_switch_cmd cmd = { 0 };
      const struct iwl_channel_info *ch_info;

      band = ((priv->phymode == MODE_IEEE80211B) ||
            (priv->phymode == MODE_IEEE80211G));

      ch_info = iwl_get_channel_info(priv, priv->phymode, channel);

      is_fat = is_fat_channel(priv->staging_rxon.flags);

      if (is_fat &&
          (priv->active_rxon.flags & RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK))
            ctrl_chan_high = 1;

      cmd.band = band;
      cmd.expect_beacon = 0;
      cmd.channel = cpu_to_le16(channel);
      cmd.rxon_flags = priv->active_rxon.flags;
      cmd.rxon_filter_flags = priv->active_rxon.filter_flags;
      cmd.switch_time = cpu_to_le32(priv->ucode_beacon_time);
      if (ch_info)
            cmd.expect_beacon = is_channel_radar(ch_info);
      else
            cmd.expect_beacon = 1;

      rc = iwl4965_fill_txpower_tbl(priv, band, channel, is_fat,
                              ctrl_chan_high, &cmd.tx_power);
      if (rc) {
            IWL_DEBUG_11H("error:%d  fill txpower_tbl\n", rc);
            return rc;
      }

      rc = iwl_send_cmd_pdu(priv, REPLY_CHANNEL_SWITCH, sizeof(cmd), &cmd);
      return rc;
}

#define RTS_HCCA_RETRY_LIMIT        3
#define RTS_DFAULT_RETRY_LIMIT            60

void iwl_hw_build_tx_cmd_rate(struct iwl_priv *priv,
                        struct iwl_cmd *cmd,
                        struct ieee80211_tx_control *ctrl,
                        struct ieee80211_hdr *hdr, int sta_id,
                        int is_hcca)
{
      u8 rate;
      u8 rts_retry_limit = 0;
      u8 data_retry_limit = 0;
      __le32 tx_flags;
      u16 fc = le16_to_cpu(hdr->frame_control);

      tx_flags = cmd->cmd.tx.tx_flags;

      rate = iwl_rates[ctrl->tx_rate].plcp;

      rts_retry_limit = (is_hcca) ?
          RTS_HCCA_RETRY_LIMIT : RTS_DFAULT_RETRY_LIMIT;

      if (ieee80211_is_probe_response(fc)) {
            data_retry_limit = 3;
            if (data_retry_limit < rts_retry_limit)
                  rts_retry_limit = data_retry_limit;
      } else
            data_retry_limit = IWL_DEFAULT_TX_RETRY;

      if (priv->data_retry_limit != -1)
            data_retry_limit = priv->data_retry_limit;

      if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
            switch (fc & IEEE80211_FCTL_STYPE) {
            case IEEE80211_STYPE_AUTH:
            case IEEE80211_STYPE_DEAUTH:
            case IEEE80211_STYPE_ASSOC_REQ:
            case IEEE80211_STYPE_REASSOC_REQ:
                  if (tx_flags & TX_CMD_FLG_RTS_MSK) {
                        tx_flags &= ~TX_CMD_FLG_RTS_MSK;
                        tx_flags |= TX_CMD_FLG_CTS_MSK;
                  }
                  break;
            default:
                  break;
            }
      }

      cmd->cmd.tx.rts_retry_limit = rts_retry_limit;
      cmd->cmd.tx.data_retry_limit = data_retry_limit;
      cmd->cmd.tx.rate_n_flags = iwl_hw_set_rate_n_flags(rate, 0);
      cmd->cmd.tx.tx_flags = tx_flags;
}

int iwl_hw_get_rx_read(struct iwl_priv *priv)
{
      struct iwl_shared *shared_data = priv->hw_setting.shared_virt;

      return IWL_GET_BITS(*shared_data, rb_closed_stts_rb_num);
}

int iwl_hw_get_temperature(struct iwl_priv *priv)
{
      return priv->temperature;
}

unsigned int iwl_hw_get_beacon_cmd(struct iwl_priv *priv,
                    struct iwl_frame *frame, u8 rate)
{
      struct iwl_tx_beacon_cmd *tx_beacon_cmd;
      unsigned int frame_size;

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

      tx_beacon_cmd->tx.sta_id = IWL4965_BROADCAST_ID;
      tx_beacon_cmd->tx.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;

      frame_size = iwl_fill_beacon_frame(priv,
                        tx_beacon_cmd->frame,
                        BROADCAST_ADDR,
                        sizeof(frame->u) - sizeof(*tx_beacon_cmd));

      BUG_ON(frame_size > MAX_MPDU_SIZE);
      tx_beacon_cmd->tx.len = cpu_to_le16((u16)frame_size);

      if ((rate == IWL_RATE_1M_PLCP) || (rate >= IWL_RATE_2M_PLCP))
            tx_beacon_cmd->tx.rate_n_flags =
                  iwl_hw_set_rate_n_flags(rate, RATE_MCS_CCK_MSK);
      else
            tx_beacon_cmd->tx.rate_n_flags =
                  iwl_hw_set_rate_n_flags(rate, 0);

      tx_beacon_cmd->tx.tx_flags = (TX_CMD_FLG_SEQ_CTL_MSK |
                        TX_CMD_FLG_TSF_MSK | TX_CMD_FLG_STA_RATE_MSK);
      return (sizeof(*tx_beacon_cmd) + frame_size);
}

int iwl_hw_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq)
{
      int rc;
      unsigned long flags;
      int txq_id = txq->q.id;

      spin_lock_irqsave(&priv->lock, flags);
      rc = iwl_grab_restricted_access(priv);
      if (rc) {
            spin_unlock_irqrestore(&priv->lock, flags);
            return rc;
      }

      iwl_write_restricted(priv, FH_MEM_CBBC_QUEUE(txq_id),
                       txq->q.dma_addr >> 8);
      iwl_write_restricted(
            priv, IWL_FH_TCSR_CHNL_TX_CONFIG_REG(txq_id),
            IWL_FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
            IWL_FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE_VAL);
      iwl_release_restricted_access(priv);
      spin_unlock_irqrestore(&priv->lock, flags);

      return 0;
}

static inline u8 iwl4965_get_dma_hi_address(dma_addr_t addr)
{
      return sizeof(addr) > sizeof(u32) ? (addr >> 16) >> 16 : 0;
}

int iwl_hw_txq_attach_buf_to_tfd(struct iwl_priv *priv, void *ptr,
                         dma_addr_t addr, u16 len)
{
      int index, is_odd;
      struct iwl_tfd_frame *tfd = ptr;
      u32 num_tbs = IWL_GET_BITS(*tfd, num_tbs);

      if ((num_tbs >= MAX_NUM_OF_TBS) || (num_tbs < 0)) {
            IWL_ERROR("Error can not send more than %d chunks\n",
                    MAX_NUM_OF_TBS);
            return -EINVAL;
      }

      index = num_tbs / 2;
      is_odd = num_tbs & 0x1;

      if (!is_odd) {
            tfd->pa[index].tb1_addr = cpu_to_le32(addr);
            IWL_SET_BITS(tfd->pa[index], tb1_addr_hi,
                       iwl4965_get_dma_hi_address(addr));
            IWL_SET_BITS(tfd->pa[index], tb1_len, len);
      } else {
            IWL_SET_BITS(tfd->pa[index], tb2_addr_lo16,
                       (u32) (addr & 0xffff));
            IWL_SET_BITS(tfd->pa[index], tb2_addr_hi20, addr >> 16);
            IWL_SET_BITS(tfd->pa[index], tb2_len, len);
      }

      IWL_SET_BITS(*tfd, num_tbs, num_tbs + 1);

      return 0;
}

void iwl_hw_card_show_info(struct iwl_priv *priv)
{
      u16 hw_version = priv->eeprom.board_revision_4965;

      IWL_DEBUG_INFO("4965ABGN HW Version %u.%u.%u\n",
                   ((hw_version >> 8) & 0x0F),
                   ((hw_version >> 8) >> 4), (hw_version & 0x00FF));

      IWL_DEBUG_INFO("4965ABGN PBA Number %.16s\n",
                   priv->eeprom.board_pba_number_4965);
}

#define IWL_TX_CRC_SIZE       4
#define IWL_TX_DELIMITER_SIZE 4

int iwl4965_tx_queue_update_wr_ptr(struct iwl_priv *priv,
                           struct iwl_tx_queue *txq, u16 byte_cnt)
{
      int len;
      int txq_id = txq->q.id;
      struct iwl_shared *shared_data = priv->hw_setting.shared_virt;

      if (txq->need_update == 0)
            return 0;

      len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE;

      IWL_SET_BITS16(shared_data->queues_byte_cnt_tbls[txq_id].
                   tfd_offset[txq->q.first_empty], byte_cnt, len);

      if (txq->q.first_empty < IWL4965_MAX_WIN_SIZE)
            IWL_SET_BITS16(shared_data->queues_byte_cnt_tbls[txq_id].
                  tfd_offset[IWL4965_QUEUE_SIZE + txq->q.first_empty],
                  byte_cnt, len);

      return 0;
}

/* Set up Rx receiver/antenna/chain usage in "staging" RXON image.
 * This should not be used for scan command ... it puts data in wrong place.  */
void iwl4965_set_rxon_chain(struct iwl_priv *priv)
{
      u8 is_single = is_single_stream(priv);
      u8 idle_state, rx_state;

      priv->staging_rxon.rx_chain = 0;
      rx_state = idle_state = 3;

      /* Tell uCode which antennas are actually connected.
       * Before first association, we assume all antennas are connected.
       * Just after first association, iwl4965_noise_calibration()
       *    checks which antennas actually *are* connected. */
      priv->staging_rxon.rx_chain |=
          cpu_to_le16(priv->valid_antenna << RXON_RX_CHAIN_VALID_POS);

      /* How many receivers should we use? */
      iwl4965_get_rx_chain_counter(priv, &idle_state, &rx_state);
      priv->staging_rxon.rx_chain |=
            cpu_to_le16(rx_state << RXON_RX_CHAIN_MIMO_CNT_POS);
      priv->staging_rxon.rx_chain |=
            cpu_to_le16(idle_state << RXON_RX_CHAIN_CNT_POS);

      if (!is_single && (rx_state >= 2) &&
          !test_bit(STATUS_POWER_PMI, &priv->status))
            priv->staging_rxon.rx_chain |= RXON_RX_CHAIN_MIMO_FORCE_MSK;
      else
            priv->staging_rxon.rx_chain &= ~RXON_RX_CHAIN_MIMO_FORCE_MSK;

      IWL_DEBUG_ASSOC("rx chain %X\n", priv->staging_rxon.rx_chain);
}

#ifdef CONFIG_IWLWIFI_HT
#ifdef CONFIG_IWLWIFI_HT_AGG
/*
      get the traffic load value for tid
*/
static u32 iwl4965_tl_get_load(struct iwl_priv *priv, u8 tid)
{
      u32 load = 0;
      u32 current_time = jiffies_to_msecs(jiffies);
      u32 time_diff;
      s32 index;
      unsigned long flags;
      struct iwl_traffic_load *tid_ptr = NULL;

      if (tid >= TID_MAX_LOAD_COUNT)
            return 0;

      tid_ptr = &(priv->lq_mngr.agg_ctrl.traffic_load[tid]);

      current_time -= current_time % TID_ROUND_VALUE;

      spin_lock_irqsave(&priv->lq_mngr.lock, flags);
      if (!(tid_ptr->queue_count))
            goto out;

      time_diff = TIME_WRAP_AROUND(tid_ptr->time_stamp, current_time);
      index = time_diff / TID_QUEUE_CELL_SPACING;

      if (index >= TID_QUEUE_MAX_SIZE) {
            u32 oldest_time = current_time - TID_MAX_TIME_DIFF;

            while (tid_ptr->queue_count &&
                   (tid_ptr->time_stamp < oldest_time)) {
                  tid_ptr->total -= tid_ptr->packet_count[tid_ptr->head];
                  tid_ptr->packet_count[tid_ptr->head] = 0;
                  tid_ptr->time_stamp += TID_QUEUE_CELL_SPACING;
                  tid_ptr->queue_count--;
                  tid_ptr->head++;
                  if (tid_ptr->head >= TID_QUEUE_MAX_SIZE)
                        tid_ptr->head = 0;
            }
      }
      load = tid_ptr->total;

 out:
      spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);
      return load;
}

/*
      increment traffic load value for tid and also remove
      any old values if passed the certian time period
*/
static void iwl4965_tl_add_packet(struct iwl_priv *priv, u8 tid)
{
      u32 current_time = jiffies_to_msecs(jiffies);
      u32 time_diff;
      s32 index;
      unsigned long flags;
      struct iwl_traffic_load *tid_ptr = NULL;

      if (tid >= TID_MAX_LOAD_COUNT)
            return;

      tid_ptr = &(priv->lq_mngr.agg_ctrl.traffic_load[tid]);

      current_time -= current_time % TID_ROUND_VALUE;

      spin_lock_irqsave(&priv->lq_mngr.lock, flags);
      if (!(tid_ptr->queue_count)) {
            tid_ptr->total = 1;
            tid_ptr->time_stamp = current_time;
            tid_ptr->queue_count = 1;
            tid_ptr->head = 0;
            tid_ptr->packet_count[0] = 1;
            goto out;
      }

      time_diff = TIME_WRAP_AROUND(tid_ptr->time_stamp, current_time);
      index = time_diff / TID_QUEUE_CELL_SPACING;

      if (index >= TID_QUEUE_MAX_SIZE) {
            u32 oldest_time = current_time - TID_MAX_TIME_DIFF;

            while (tid_ptr->queue_count &&
                   (tid_ptr->time_stamp < oldest_time)) {
                  tid_ptr->total -= tid_ptr->packet_count[tid_ptr->head];
                  tid_ptr->packet_count[tid_ptr->head] = 0;
                  tid_ptr->time_stamp += TID_QUEUE_CELL_SPACING;
                  tid_ptr->queue_count--;
                  tid_ptr->head++;
                  if (tid_ptr->head >= TID_QUEUE_MAX_SIZE)
                        tid_ptr->head = 0;
            }
      }

      index = (tid_ptr->head + index) % TID_QUEUE_MAX_SIZE;
      tid_ptr->packet_count[index] = tid_ptr->packet_count[index] + 1;
      tid_ptr->total = tid_ptr->total + 1;

      if ((index + 1) > tid_ptr->queue_count)
            tid_ptr->queue_count = index + 1;
 out:
      spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);

}

#define MMAC_SCHED_MAX_NUMBER_OF_HT_BACK_FLOWS   7
enum HT_STATUS {
      BA_STATUS_FAILURE = 0,
      BA_STATUS_INITIATOR_DELBA,
      BA_STATUS_RECIPIENT_DELBA,
      BA_STATUS_RENEW_ADDBA_REQUEST,
      BA_STATUS_ACTIVE,
};

static u8 iwl4964_tl_ba_avail(struct iwl_priv *priv)
{
      int i;
      struct iwl_lq_mngr *lq;
      u8 count = 0;
      u16 msk;

      lq = (struct iwl_lq_mngr *)&(priv->lq_mngr);
      for (i = 0; i < TID_MAX_LOAD_COUNT ; i++) {
            msk = 1 << i;
            if ((lq->agg_ctrl.granted_ba & msk) ||
                (lq->agg_ctrl.wait_for_agg_status & msk))
                  count++;
      }

      if (count < MMAC_SCHED_MAX_NUMBER_OF_HT_BACK_FLOWS)
            return 1;

      return 0;
}

static void iwl4965_ba_status(struct iwl_priv *priv,
                        u8 tid, enum HT_STATUS status);

static int iwl4965_perform_addba(struct iwl_priv *priv, u8 tid, u32 length,
                         u32 ba_timeout)
{
      int rc;

      rc = ieee80211_start_BA_session(priv->hw, priv->bssid, tid);
      if (rc)
            iwl4965_ba_status(priv, tid, BA_STATUS_FAILURE);

      return rc;
}

static int iwl4965_perform_delba(struct iwl_priv *priv, u8 tid)
{
      int rc;

      rc = ieee80211_stop_BA_session(priv->hw, priv->bssid, tid);
      if (rc)
            iwl4965_ba_status(priv, tid, BA_STATUS_FAILURE);

      return rc;
}

static void iwl4965_turn_on_agg_for_tid(struct iwl_priv *priv,
                              struct iwl_lq_mngr *lq,
                              u8 auto_agg, u8 tid)
{
      u32 tid_msk = (1 << tid);
      unsigned long flags;

      spin_lock_irqsave(&priv->lq_mngr.lock, flags);
/*
      if ((auto_agg) && (!lq->enable_counter)){
            lq->agg_ctrl.next_retry = 0;
            lq->agg_ctrl.tid_retry = 0;
            spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);
            return;
      }
*/
      if (!(lq->agg_ctrl.granted_ba & tid_msk) &&
          (lq->agg_ctrl.requested_ba & tid_msk)) {
            u8 available_queues;
            u32 load;

            spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);
            available_queues = iwl4964_tl_ba_avail(priv);
            load = iwl4965_tl_get_load(priv, tid);

            spin_lock_irqsave(&priv->lq_mngr.lock, flags);
            if (!available_queues) {
                  if (auto_agg)
                        lq->agg_ctrl.tid_retry |= tid_msk;
                  else {
                        lq->agg_ctrl.requested_ba &= ~tid_msk;
                        lq->agg_ctrl.wait_for_agg_status &= ~tid_msk;
                  }
            } else if ((auto_agg) &&
                     ((load <= lq->agg_ctrl.tid_traffic_load_threshold) ||
                      ((lq->agg_ctrl.wait_for_agg_status & tid_msk))))
                  lq->agg_ctrl.tid_retry |= tid_msk;
            else {
                  lq->agg_ctrl.wait_for_agg_status |= tid_msk;
                  spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);
                  iwl4965_perform_addba(priv, tid, 0x40,
                                    lq->agg_ctrl.ba_timeout);
                  spin_lock_irqsave(&priv->lq_mngr.lock, flags);
            }
      }
      spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);
}

static void iwl4965_turn_on_agg(struct iwl_priv *priv, u8 tid)
{
      struct iwl_lq_mngr *lq;
      unsigned long flags;

      lq = (struct iwl_lq_mngr *)&(priv->lq_mngr);

      if ((tid < TID_MAX_LOAD_COUNT))
            iwl4965_turn_on_agg_for_tid(priv, lq, lq->agg_ctrl.auto_agg,
                                  tid);
      else if (tid == TID_ALL_SPECIFIED) {
            if (lq->agg_ctrl.requested_ba) {
                  for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
                        iwl4965_turn_on_agg_for_tid(priv, lq,
                              lq->agg_ctrl.auto_agg, tid);
            } else {
                  spin_lock_irqsave(&priv->lq_mngr.lock, flags);
                  lq->agg_ctrl.tid_retry = 0;
                  lq->agg_ctrl.next_retry = 0;
                  spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);
            }
      }

}

void iwl4965_turn_off_agg(struct iwl_priv *priv, u8 tid)
{
      u32 tid_msk;
      struct iwl_lq_mngr *lq;
      unsigned long flags;

      lq = (struct iwl_lq_mngr *)&(priv->lq_mngr);

      if ((tid < TID_MAX_LOAD_COUNT)) {
            tid_msk = 1 << tid;
            spin_lock_irqsave(&priv->lq_mngr.lock, flags);
            lq->agg_ctrl.wait_for_agg_status |= tid_msk;
            lq->agg_ctrl.requested_ba &= ~tid_msk;
            spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);
            iwl4965_perform_delba(priv, tid);
      } else if (tid == TID_ALL_SPECIFIED) {
            spin_lock_irqsave(&priv->lq_mngr.lock, flags);
            for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++) {
                  tid_msk = 1 << tid;
                  lq->agg_ctrl.wait_for_agg_status |= tid_msk;
                  spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);
                  iwl4965_perform_delba(priv, tid);
                  spin_lock_irqsave(&priv->lq_mngr.lock, flags);
            }
            lq->agg_ctrl.requested_ba = 0;
            spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);
      }
}

static void iwl4965_ba_status(struct iwl_priv *priv,
                        u8 tid, enum HT_STATUS status)
{
      struct iwl_lq_mngr *lq;
      u32 tid_msk = (1 << tid);
      unsigned long flags;

      lq = (struct iwl_lq_mngr *)&(priv->lq_mngr);

      if ((tid >= TID_MAX_LOAD_COUNT))
            goto out;

      spin_lock_irqsave(&priv->lq_mngr.lock, flags);
      switch (status) {
      case BA_STATUS_ACTIVE:
            if (!(lq->agg_ctrl.granted_ba & tid_msk))
                  lq->agg_ctrl.granted_ba |= tid_msk;
            break;
      default:
            if ((lq->agg_ctrl.granted_ba & tid_msk))
                  lq->agg_ctrl.granted_ba &= ~tid_msk;
            break;
      }

      lq->agg_ctrl.wait_for_agg_status &= ~tid_msk;
      if (status != BA_STATUS_ACTIVE) {
            if (lq->agg_ctrl.auto_agg) {
                  lq->agg_ctrl.tid_retry |= tid_msk;
                  lq->agg_ctrl.next_retry =
                      jiffies + msecs_to_jiffies(500);
            } else
                  lq->agg_ctrl.requested_ba &= ~tid_msk;
      }
      spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);
 out:
      return;
}

static void iwl4965_bg_agg_work(struct work_struct *work)
{
      struct iwl_priv *priv = container_of(work, struct iwl_priv,
                              agg_work);

      u32 tid;
      u32 retry_tid;
      u32 tid_msk;
      unsigned long flags;
      struct iwl_lq_mngr *lq = (struct iwl_lq_mngr *)&(priv->lq_mngr);

      spin_lock_irqsave(&priv->lq_mngr.lock, flags);
      retry_tid = lq->agg_ctrl.tid_retry;
      lq->agg_ctrl.tid_retry = 0;
      spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);

      if (retry_tid == TID_ALL_SPECIFIED)
            iwl4965_turn_on_agg(priv, TID_ALL_SPECIFIED);
      else {
            for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++) {
                  tid_msk = (1 << tid);
                  if (retry_tid & tid_msk)
                        iwl4965_turn_on_agg(priv, tid);
            }
      }

      spin_lock_irqsave(&priv->lq_mngr.lock, flags);
      if (lq->agg_ctrl.tid_retry)
            lq->agg_ctrl.next_retry = jiffies + msecs_to_jiffies(500);
      spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);
      return;
}
#endif /*CONFIG_IWLWIFI_HT_AGG */
#endif /* CONFIG_IWLWIFI_HT */

int iwl4965_tx_cmd(struct iwl_priv *priv, struct iwl_cmd *out_cmd,
               u8 sta_id, dma_addr_t txcmd_phys,
               struct ieee80211_hdr *hdr, u8 hdr_len,
               struct ieee80211_tx_control *ctrl, void *sta_in)
{
      struct iwl_tx_cmd cmd;
      struct iwl_tx_cmd *tx = (struct iwl_tx_cmd *)&out_cmd->cmd.payload[0];
      dma_addr_t scratch_phys;
      u8 unicast = 0;
      u8 is_data = 1;
      u16 fc;
      u16 rate_flags;
      int rate_index = min(ctrl->tx_rate & 0xffff, IWL_RATE_COUNT - 1);
#ifdef CONFIG_IWLWIFI_HT
#ifdef CONFIG_IWLWIFI_HT_AGG
      __le16 *qc;
#endif /*CONFIG_IWLWIFI_HT_AGG */
#endif /* CONFIG_IWLWIFI_HT */

      unicast = !is_multicast_ether_addr(hdr->addr1);

      fc = le16_to_cpu(hdr->frame_control);
      if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
            is_data = 0;

      memcpy(&cmd, &(out_cmd->cmd.tx), sizeof(struct iwl_tx_cmd));
      memset(tx, 0, sizeof(struct iwl_tx_cmd));
      memcpy(tx->hdr, hdr, hdr_len);

      tx->len = cmd.len;
      tx->driver_txop = cmd.driver_txop;
      tx->stop_time.life_time = cmd.stop_time.life_time;
      tx->tx_flags = cmd.tx_flags;
      tx->sta_id = cmd.sta_id;
      tx->tid_tspec = cmd.tid_tspec;
      tx->timeout.pm_frame_timeout = cmd.timeout.pm_frame_timeout;
      tx->next_frame_len = cmd.next_frame_len;

      tx->sec_ctl = cmd.sec_ctl;
      memcpy(&(tx->key[0]), &(cmd.key[0]), 16);
      tx->tx_flags = cmd.tx_flags;

      tx->rts_retry_limit = cmd.rts_retry_limit;
      tx->data_retry_limit = cmd.data_retry_limit;

      scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) +
          offsetof(struct iwl_tx_cmd, scratch);
      tx->dram_lsb_ptr = cpu_to_le32(scratch_phys);
      tx->dram_msb_ptr = iwl4965_get_dma_hi_address(scratch_phys);

      /* Hard coded to start at the highest retry fallback position
       * until the 4965 specific rate control algorithm is tied in */
      tx->initial_rate_index = LINK_QUAL_MAX_RETRY_NUM - 1;

      /* Alternate between antenna A and B for successive frames */
      if (priv->use_ant_b_for_management_frame) {
            priv->use_ant_b_for_management_frame = 0;
            rate_flags = RATE_MCS_ANT_B_MSK;
      } else {
            priv->use_ant_b_for_management_frame = 1;
            rate_flags = RATE_MCS_ANT_A_MSK;
      }

      if (!unicast || !is_data) {
            if ((rate_index >= IWL_FIRST_CCK_RATE) &&
                (rate_index <= IWL_LAST_CCK_RATE))
                  rate_flags |= RATE_MCS_CCK_MSK;
      } else {
            tx->initial_rate_index = 0;
            tx->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
      }

      tx->rate_n_flags = iwl_hw_set_rate_n_flags(iwl_rates[rate_index].plcp,
                                    rate_flags);

      if (ieee80211_is_back_request(fc))
            tx->tx_flags |= TX_CMD_FLG_ACK_MSK |
                  TX_CMD_FLG_IMM_BA_RSP_MASK;
#ifdef CONFIG_IWLWIFI_HT
#ifdef CONFIG_IWLWIFI_HT_AGG
      qc = ieee80211_get_qos_ctrl(hdr);
      if (qc &&
          (priv->iw_mode != IEEE80211_IF_TYPE_IBSS)) {
            u8 tid = 0;
            tid = (u8) (le16_to_cpu(*qc) & 0xF);
            if (tid < TID_MAX_LOAD_COUNT)
                  iwl4965_tl_add_packet(priv, tid);
      }

      if (priv->lq_mngr.agg_ctrl.next_retry &&
          (time_after(priv->lq_mngr.agg_ctrl.next_retry, jiffies))) {
            unsigned long flags;

            spin_lock_irqsave(&priv->lq_mngr.lock, flags);
            priv->lq_mngr.agg_ctrl.next_retry = 0;
            spin_unlock_irqrestore(&priv->lq_mngr.lock, flags);
            schedule_work(&priv->agg_work);
      }
#endif
#endif
      return 0;
}

/**
 * sign_extend - Sign extend a value using specified bit as sign-bit
 *
 * Example: sign_extend(9, 3) would return -7 as bit3 of 1001b is 1
 * and bit0..2 is 001b which when sign extended to 1111111111111001b is -7.
 *
 * @param oper value to sign extend
 * @param index 0 based bit index (0<=index<32) to sign bit
 */
static s32 sign_extend(u32 oper, int index)
{
      u8 shift = 31 - index;

      return (s32)(oper << shift) >> shift;
}

/**
 * iwl4965_get_temperature - return the calibrated temperature (in Kelvin)
 * @statistics: Provides the temperature reading from the uCode
 *
 * A return of <0 indicates bogus data in the statistics
 */
int iwl4965_get_temperature(const struct iwl_priv *priv)
{
      s32 temperature;
      s32 vt;
      s32 R1, R2, R3;
      u32 R4;

      if (test_bit(STATUS_TEMPERATURE, &priv->status) &&
            (priv->statistics.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK)) {
            IWL_DEBUG_TEMP("Running FAT temperature calibration\n");
            R1 = (s32)le32_to_cpu(priv->card_alive_init.therm_r1[1]);
            R2 = (s32)le32_to_cpu(priv->card_alive_init.therm_r2[1]);
            R3 = (s32)le32_to_cpu(priv->card_alive_init.therm_r3[1]);
            R4 = le32_to_cpu(priv->card_alive_init.therm_r4[1]);
      } else {
            IWL_DEBUG_TEMP("Running temperature calibration\n");
            R1 = (s32)le32_to_cpu(priv->card_alive_init.therm_r1[0]);
            R2 = (s32)le32_to_cpu(priv->card_alive_init.therm_r2[0]);
            R3 = (s32)le32_to_cpu(priv->card_alive_init.therm_r3[0]);
            R4 = le32_to_cpu(priv->card_alive_init.therm_r4[0]);
      }

      /*
       * Temperature is only 23 bits so sign extend out to 32
       *
       * NOTE If we haven't received a statistics notification yet
       * with an updated temperature, use R4 provided to us in the
       * ALIVE response. */
      if (!test_bit(STATUS_TEMPERATURE, &priv->status))
            vt = sign_extend(R4, 23);
      else
            vt = sign_extend(
                  le32_to_cpu(priv->statistics.general.temperature), 23);

      IWL_DEBUG_TEMP("Calib values R[1-3]: %d %d %d R4: %d\n",
                   R1, R2, R3, vt);

      if (R3 == R1) {
            IWL_ERROR("Calibration conflict R1 == R3\n");
            return -1;
      }

      /* Calculate temperature in degrees Kelvin, adjust by 97%.
       * Add offset to center the adjustment around 0 degrees Centigrade. */
      temperature = TEMPERATURE_CALIB_A_VAL * (vt - R2);
      temperature /= (R3 - R1);
      temperature = (temperature * 97) / 100 +
          TEMPERATURE_CALIB_KELVIN_OFFSET;

      IWL_DEBUG_TEMP("Calibrated temperature: %dK, %dC\n", temperature,
          KELVIN_TO_CELSIUS(temperature));

      return temperature;
}

/* Adjust Txpower only if temperature variance is greater than threshold. */
#define IWL_TEMPERATURE_THRESHOLD   3

/**
 * iwl4965_is_temp_calib_needed - determines if new calibration is needed
 *
 * If the temperature changed has changed sufficiently, then a recalibration
 * is needed.
 *
 * Assumes caller will replace priv->last_temperature once calibration
 * executed.
 */
static int iwl4965_is_temp_calib_needed(struct iwl_priv *priv)
{
      int temp_diff;

      if (!test_bit(STATUS_STATISTICS, &priv->status)) {
            IWL_DEBUG_TEMP("Temperature not updated -- no statistics.\n");
            return 0;
      }

      temp_diff = priv->temperature - priv->last_temperature;

      /* get absolute value */
      if (temp_diff < 0) {
            IWL_DEBUG_POWER("Getting cooler, delta %d, \n", temp_diff);
            temp_diff = -temp_diff;
      } else if (temp_diff == 0)
            IWL_DEBUG_POWER("Same temp, \n");
      else
            IWL_DEBUG_POWER("Getting warmer, delta %d, \n", temp_diff);

      if (temp_diff < IWL_TEMPERATURE_THRESHOLD) {
            IWL_DEBUG_POWER("Thermal txpower calib not needed\n");
            return 0;
      }

      IWL_DEBUG_POWER("Thermal txpower calib needed\n");

      return 1;
}

/* Calculate noise level, based on measurements during network silence just
 *   before arriving beacon.  This measurement can be done only if we know
 *   exactly when to expect beacons, therefore only when we're associated. */
static void iwl4965_rx_calc_noise(struct iwl_priv *priv)
{
      struct statistics_rx_non_phy *rx_info
                        = &(priv->statistics.rx.general);
      int num_active_rx = 0;
      int total_silence = 0;
      int bcn_silence_a =
            le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
      int bcn_silence_b =
            le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
      int bcn_silence_c =
            le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;

      if (bcn_silence_a) {
            total_silence += bcn_silence_a;
            num_active_rx++;
      }
      if (bcn_silence_b) {
            total_silence += bcn_silence_b;
            num_active_rx++;
      }
      if (bcn_silence_c) {
            total_silence += bcn_silence_c;
            num_active_rx++;
      }

      /* Average among active antennas */
      if (num_active_rx)
            priv->last_rx_noise = (total_silence / num_active_rx) - 107;
      else
            priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;

      IWL_DEBUG_CALIB("inband silence a %u, b %u, c %u, dBm %d\n",
                  bcn_silence_a, bcn_silence_b, bcn_silence_c,
                  priv->last_rx_noise);
}

void iwl_hw_rx_statistics(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
{
      struct iwl_rx_packet *pkt = (void *)rxb->skb->data;
      int change;
      s32 temp;

      IWL_DEBUG_RX("Statistics notification received (%d vs %d).\n",
                 (int)sizeof(priv->statistics), pkt->len);

      change = ((priv->statistics.general.temperature !=
               pkt->u.stats.general.temperature) ||
              ((priv->statistics.flag &
                STATISTICS_REPLY_FLG_FAT_MODE_MSK) !=
               (pkt->u.stats.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK)));

      memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));

      set_bit(STATUS_STATISTICS, &priv->status);

      /* Reschedule the statistics timer to occur in
       * REG_RECALIB_PERIOD seconds to ensure we get a
       * thermal update even if the uCode doesn't give
       * us one */
      mod_timer(&priv->statistics_periodic, jiffies +
              msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));

      if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
          (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
            iwl4965_rx_calc_noise(priv);
#ifdef CONFIG_IWLWIFI_SENSITIVITY
            queue_work(priv->workqueue, &priv->sensitivity_work);
#endif
      }

      /* If the hardware hasn't reported a change in
       * temperature then don't bother computing a
       * calibrated temperature value */
      if (!change)
            return;

      temp = iwl4965_get_temperature(priv);
      if (temp < 0)
            return;

      if (priv->temperature != temp) {
            if (priv->temperature)
                  IWL_DEBUG_TEMP("Temperature changed "
                               "from %dC to %dC\n",
                               KELVIN_TO_CELSIUS(priv->temperature),
                               KELVIN_TO_CELSIUS(temp));
            else
                  IWL_DEBUG_TEMP("Temperature "
                               "initialized to %dC\n",
                               KELVIN_TO_CELSIUS(temp));
      }

      priv->temperature = temp;
      set_bit(STATUS_TEMPERATURE, &priv->status);

      if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
                 iwl4965_is_temp_calib_needed(priv))
            queue_work(priv->workqueue, &priv->txpower_work);
}

static void iwl4965_handle_data_packet(struct iwl_priv *priv, int is_data,
                               int include_phy,
                               struct iwl_rx_mem_buffer *rxb,
                               struct ieee80211_rx_status *stats)
{
      struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
      struct iwl4965_rx_phy_res *rx_start = (include_phy) ?
          (struct iwl4965_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
      struct ieee80211_hdr *hdr;
      u16 len;
      __le32 *rx_end;
      unsigned int skblen;
      u32 ampdu_status;

      if (!include_phy && priv->last_phy_res[0])
            rx_start = (struct iwl4965_rx_phy_res *)&priv->last_phy_res[1];

      if (!rx_start) {
            IWL_ERROR("MPDU frame without a PHY data\n");
            return;
      }
      if (include_phy) {
            hdr = (struct ieee80211_hdr *)((u8 *) & rx_start[1] +
                                     rx_start->cfg_phy_cnt);

            len = le16_to_cpu(rx_start->byte_count);

            rx_end = (__le32 *) ((u8 *) & pkt->u.raw[0] +
                          sizeof(struct iwl4965_rx_phy_res) +
                          rx_start->cfg_phy_cnt + len);

      } else {
            struct iwl4965_rx_mpdu_res_start *amsdu =
                (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;

            hdr = (struct ieee80211_hdr *)(pkt->u.raw +
                         sizeof(struct iwl4965_rx_mpdu_res_start));
            len =  le16_to_cpu(amsdu->byte_count);
            rx_start->byte_count = amsdu->byte_count;
            rx_end = (__le32 *) (((u8 *) hdr) + len);
      }
      if (len > 2342 || len < 16) {
            IWL_DEBUG_DROP("byte count out of range [16,2342]"
                         " : %d\n", len);
            return;
      }

      ampdu_status = le32_to_cpu(*rx_end);
      skblen = ((u8 *) rx_end - (u8 *) & pkt->u.raw[0]) + sizeof(u32);

      /* start from MAC */
      skb_reserve(rxb->skb, (void *)hdr - (void *)pkt);
      skb_put(rxb->skb, len); /* end where data ends */

      /* We only process data packets if the interface is open */
      if (unlikely(!priv->is_open)) {
            IWL_DEBUG_DROP_LIMIT
                ("Dropping packet while interface is not open.\n");
            return;
      }

      if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR) {
            if (iwl_param_hwcrypto)
                  iwl_set_decrypted_flag(priv, rxb->skb,
                                     ampdu_status, stats);
            iwl_handle_data_packet_monitor(priv, rxb, hdr, len, stats, 0);
            return;
      }

      stats->flag = 0;
      hdr = (struct ieee80211_hdr *)rxb->skb->data;

      if (iwl_param_hwcrypto)
            iwl_set_decrypted_flag(priv, rxb->skb, ampdu_status, stats);

      ieee80211_rx_irqsafe(priv->hw, rxb->skb, stats);
      priv->alloc_rxb_skb--;
      rxb->skb = NULL;
#ifdef LED
      priv->led_packets += len;
      iwl_setup_activity_timer(priv);
#endif
}

/* Calc max signal level (dBm) among 3 possible receivers */
static int iwl4965_calc_rssi(struct iwl4965_rx_phy_res *rx_resp)
{
      /* data from PHY/DSP regarding signal strength, etc.,
       *   contents are always there, not configurable by host.  */
      struct iwl4965_rx_non_cfg_phy *ncphy =
          (struct iwl4965_rx_non_cfg_phy *)rx_resp->non_cfg_phy;
      u32 agc = (le16_to_cpu(ncphy->agc_info) & IWL_AGC_DB_MASK)
                  >> IWL_AGC_DB_POS;

      u32 valid_antennae =
          (le16_to_cpu(rx_resp->phy_flags) & RX_PHY_FLAGS_ANTENNAE_MASK)
                  >> RX_PHY_FLAGS_ANTENNAE_OFFSET;
      u8 max_rssi = 0;
      u32 i;

      /* Find max rssi among 3 possible receivers.
       * These values are measured by the digital signal processor (DSP).
       * They should stay fairly constant even as the signal strength varies,
       *   if the radio's automatic gain control (AGC) is working right.
       * AGC value (see below) will provide the "interesting" info. */
      for (i = 0; i < 3; i++)
            if (valid_antennae & (1 << i))
                  max_rssi = max(ncphy->rssi_info[i << 1], max_rssi);

      IWL_DEBUG_STATS("Rssi In A %d B %d C %d Max %d AGC dB %d\n",
            ncphy->rssi_info[0], ncphy->rssi_info[2], ncphy->rssi_info[4],
            max_rssi, agc);

      /* dBm = max_rssi dB - agc dB - constant.
       * Higher AGC (higher radio gain) means lower signal. */
      return (max_rssi - agc - IWL_RSSI_OFFSET);
}

#ifdef CONFIG_IWLWIFI_HT

/* Parsed Information Elements */
struct ieee802_11_elems {
      u8 *ds_params;
      u8 ds_params_len;
      u8 *tim;
      u8 tim_len;
      u8 *ibss_params;
      u8 ibss_params_len;
      u8 *erp_info;
      u8 erp_info_len;
      u8 *ht_cap_param;
      u8 ht_cap_param_len;
      u8 *ht_extra_param;
      u8 ht_extra_param_len;
};

static int parse_elems(u8 *start, size_t len, struct ieee802_11_elems *elems)
{
      size_t left = len;
      u8 *pos = start;
      int unknown = 0;

      memset(elems, 0, sizeof(*elems));

      while (left >= 2) {
            u8 id, elen;

            id = *pos++;
            elen = *pos++;
            left -= 2;

            if (elen > left)
                  return -1;

            switch (id) {
            case WLAN_EID_DS_PARAMS:
                  elems->ds_params = pos;
                  elems->ds_params_len = elen;
                  break;
            case WLAN_EID_TIM:
                  elems->tim = pos;
                  elems->tim_len = elen;
                  break;
            case WLAN_EID_IBSS_PARAMS:
                  elems->ibss_params = pos;
                  elems->ibss_params_len = elen;
                  break;
            case WLAN_EID_ERP_INFO:
                  elems->erp_info = pos;
                  elems->erp_info_len = elen;
                  break;
            case WLAN_EID_HT_CAPABILITY:
                  elems->ht_cap_param = pos;
                  elems->ht_cap_param_len = elen;
                  break;
            case WLAN_EID_HT_EXTRA_INFO:
                  elems->ht_extra_param = pos;
                  elems->ht_extra_param_len = elen;
                  break;
            default:
                  unknown++;
                  break;
            }

            left -= elen;
            pos += elen;
      }

      return 0;
}
#endif /* CONFIG_IWLWIFI_HT */

static void iwl4965_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
{
      unsigned long flags;

      spin_lock_irqsave(&priv->sta_lock, flags);
      priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
      priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
      priv->stations[sta_id].sta.sta.modify_mask = 0;
      priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
      spin_unlock_irqrestore(&priv->sta_lock, flags);

      iwl_send_add_station(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
}

static void iwl4965_update_ps_mode(struct iwl_priv *priv, u16 ps_bit, u8 *addr)
{
      /* FIXME: need locking over ps_status ??? */
      u8 sta_id = iwl_hw_find_station(priv, addr);

      if (sta_id != IWL_INVALID_STATION) {
            u8 sta_awake = priv->stations[sta_id].
                        ps_status == STA_PS_STATUS_WAKE;

            if (sta_awake && ps_bit)
                  priv->stations[sta_id].ps_status = STA_PS_STATUS_SLEEP;
            else if (!sta_awake && !ps_bit) {
                  iwl4965_sta_modify_ps_wake(priv, sta_id);
                  priv->stations[sta_id].ps_status = STA_PS_STATUS_WAKE;
            }
      }
}

/* Called for REPLY_4965_RX (legacy ABG frames), or
 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
static void iwl4965_rx_reply_rx(struct iwl_priv *priv,
                        struct iwl_rx_mem_buffer *rxb)
{
      struct iwl_rx_packet *pkt = (void *)rxb->skb->data;
      /* Use phy data (Rx signal strength, etc.) contained within
       *   this rx packet for legacy frames,
       *   or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
      int include_phy = (pkt->hdr.cmd == REPLY_4965_RX);
      struct iwl4965_rx_phy_res *rx_start = (include_phy) ?
            (struct iwl4965_rx_phy_res *)&(pkt->u.raw[0]) :
            (struct iwl4965_rx_phy_res *)&priv->last_phy_res[1];
      __le32 *rx_end;
      unsigned int len = 0;
      struct ieee80211_hdr *header;
      u16 fc;
      struct ieee80211_rx_status stats = {
            .mactime = le64_to_cpu(rx_start->timestamp),
            .channel = le16_to_cpu(rx_start->channel),
            .phymode =
                  (rx_start->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
                  MODE_IEEE80211G : MODE_IEEE80211A,
            .antenna = 0,
            .rate = iwl_hw_get_rate(rx_start->rate_n_flags),
            .flag = 0,
#ifdef CONFIG_IWLWIFI_HT_AGG
            .ordered = 0
#endif /* CONFIG_IWLWIFI_HT_AGG */
      };
      u8 network_packet;

      if ((unlikely(rx_start->cfg_phy_cnt > 20))) {
            IWL_DEBUG_DROP
                  ("dsp size out of range [0,20]: "
                   "%d/n", rx_start->cfg_phy_cnt);
            return;
      }
      if (!include_phy) {
            if (priv->last_phy_res[0])
                  rx_start = (struct iwl4965_rx_phy_res *)
                        &priv->last_phy_res[1];
            else
                  rx_start = NULL;
      }

      if (!rx_start) {
            IWL_ERROR("MPDU frame without a PHY data\n");
            return;
      }

      if (include_phy) {
            header = (struct ieee80211_hdr *)((u8 *) & rx_start[1]
                                      + rx_start->cfg_phy_cnt);

            len = le16_to_cpu(rx_start->byte_count);
            rx_end = (__le32 *) (pkt->u.raw + rx_start->cfg_phy_cnt +
                          sizeof(struct iwl4965_rx_phy_res) + len);
      } else {
            struct iwl4965_rx_mpdu_res_start *amsdu =
                  (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;

            header = (void *)(pkt->u.raw +
                  sizeof(struct iwl4965_rx_mpdu_res_start));
            len = le16_to_cpu(amsdu->byte_count);
            rx_end = (__le32 *) (pkt->u.raw +
                  sizeof(struct iwl4965_rx_mpdu_res_start) + len);
      }

      if (!(*rx_end & RX_RES_STATUS_NO_CRC32_ERROR) ||
          !(*rx_end & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
            IWL_DEBUG_RX("Bad CRC or FIFO: 0x%08X.\n",
                        le32_to_cpu(*rx_end));
            return;
      }

      priv->ucode_beacon_time = le32_to_cpu(rx_start->beacon_time_stamp);

      stats.freq = ieee80211chan2mhz(stats.channel);

      /* Find max signal strength (dBm) among 3 antenna/receiver chains */
      stats.ssi = iwl4965_calc_rssi(rx_start);

      /* Meaningful noise values are available only from beacon statistics,
       *   which are gathered only when associated, and indicate noise
       *   only for the associated network channel ...
       * Ignore these noise values while scanning (other channels) */
      if (iwl_is_associated(priv) &&
          !test_bit(STATUS_SCANNING, &priv->status)) {
            stats.noise = priv->last_rx_noise;
            stats.signal = iwl_calc_sig_qual(stats.ssi, stats.noise);
      } else {
            stats.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
            stats.signal = iwl_calc_sig_qual(stats.ssi, 0);
      }

      /* Reset beacon noise level if not associated. */
      if (!iwl_is_associated(priv))
            priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;

#ifdef CONFIG_IWLWIFI_DEBUG
      /* TODO:  Parts of iwl_report_frame are broken for 4965 */
      if (iwl_debug_level & (IWL_DL_RX))
            /* Set "1" to report good data frames in groups of 100 */
            iwl_report_frame(priv, pkt, header, 1);

      if (iwl_debug_level & (IWL_DL_RX | IWL_DL_STATS))
      IWL_DEBUG_RX("Rssi %d, noise %d, qual %d, TSF %lu\n",
            stats.ssi, stats.noise, stats.signal,
             (long unsigned int)le64_to_cpu(rx_start->timestamp));
#endif

      network_packet = iwl_is_network_packet(priv, header);
      if (network_packet) {
            priv->last_rx_rssi = stats.ssi;
            priv->last_beacon_time =  priv->ucode_beacon_time;
            priv->last_tsf = le64_to_cpu(rx_start->timestamp);
      }

      fc = le16_to_cpu(header->frame_control);
      switch (fc & IEEE80211_FCTL_FTYPE) {
      case IEEE80211_FTYPE_MGMT:

            if (priv->iw_mode == IEEE80211_IF_TYPE_AP)
                  iwl4965_update_ps_mode(priv, fc  & IEEE80211_FCTL_PM,
                                    header->addr2);
            switch (fc & IEEE80211_FCTL_STYPE) {
            case IEEE80211_STYPE_PROBE_RESP:
            case IEEE80211_STYPE_BEACON:
                  if ((priv->iw_mode == IEEE80211_IF_TYPE_STA &&
                       !compare_ether_addr(header->addr2, priv->bssid)) ||
                      (priv->iw_mode == IEEE80211_IF_TYPE_IBSS &&
                       !compare_ether_addr(header->addr3, priv->bssid))) {
                        struct ieee80211_mgmt *mgmt =
                              (struct ieee80211_mgmt *)header;
                        u64 timestamp =
                              le64_to_cpu(mgmt->u.beacon.timestamp);

                        priv->timestamp0 = timestamp & 0xFFFFFFFF;
                        priv->timestamp1 =
                              (timestamp >> 32) & 0xFFFFFFFF;
                        priv->beacon_int = le16_to_cpu(
                            mgmt->u.beacon.beacon_int);
                        if (priv->call_post_assoc_from_beacon &&
                            (priv->iw_mode == IEEE80211_IF_TYPE_STA)) {
                              priv->call_post_assoc_from_beacon = 0;
                              queue_work(priv->workqueue,
                                  &priv->post_associate.work);
                        }
                  }
                  break;

            case IEEE80211_STYPE_ACTION:
                  break;

                  /*
                   * TODO: There is no callback function from upper
                   * stack to inform us when associated status. this
                   * work around to sniff assoc_resp management frame
                   * and finish the association process.
                   */
            case IEEE80211_STYPE_ASSOC_RESP:
            case IEEE80211_STYPE_REASSOC_RESP:
                  if (network_packet) {
#ifdef CONFIG_IWLWIFI_HT
                        u8 *pos = NULL;
                        struct ieee802_11_elems elems;
#endif                        /*CONFIG_IWLWIFI_HT */
                        struct ieee80211_mgmt *mgnt =
                              (struct ieee80211_mgmt *)header;

                        priv->assoc_id = (~((1 << 15) | (1 << 14))
                              & le16_to_cpu(mgnt->u.assoc_resp.aid));
                        priv->assoc_capability =
                              le16_to_cpu(
                                    mgnt->u.assoc_resp.capab_info);
#ifdef CONFIG_IWLWIFI_HT
                        pos = mgnt->u.assoc_resp.variable;
                        if (!parse_elems(pos,
                                     len - (pos - (u8 *) mgnt),
                                     &elems)) {
                              if (elems.ht_extra_param &&
                                  elems.ht_cap_param)
                                    break;
                        }
#endif                        /*CONFIG_IWLWIFI_HT */
                        /* assoc_id is 0 no association */
                        if (!priv->assoc_id)
                              break;
                        if (priv->beacon_int)
                              queue_work(priv->workqueue,
                                  &priv->post_associate.work);
                        else
                              priv->call_post_assoc_from_beacon = 1;
                  }

                  break;

            case IEEE80211_STYPE_PROBE_REQ:
                  if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
                      !iwl_is_associated(priv)) {
                        DECLARE_MAC_BUF(mac1);
                        DECLARE_MAC_BUF(mac2);
                        DECLARE_MAC_BUF(mac3);

                        IWL_DEBUG_DROP("Dropping (non network): "
                                     "%s, %s, %s\n",
                                     print_mac(mac1, header->addr1),
                                     print_mac(mac2, header->addr2),
                                     print_mac(mac3, header->addr3));
                        return;
                  }
            }
            iwl4965_handle_data_packet(priv, 0, include_phy, rxb, &stats);
            break;

      case IEEE80211_FTYPE_CTL:
#ifdef CONFIG_IWLWIFI_HT_AGG
            switch (fc & IEEE80211_FCTL_STYPE) {
            case IEEE80211_STYPE_BACK_REQ:
                  IWL_DEBUG_HT("IEEE80211_STYPE_BACK_REQ arrived\n");
                  iwl4965_handle_data_packet(priv, 0, include_phy,
                                    rxb, &stats);
                  break;
            default:
                  break;
            }
#endif

            break;

      case IEEE80211_FTYPE_DATA: {
            DECLARE_MAC_BUF(mac1);
            DECLARE_MAC_BUF(mac2);
            DECLARE_MAC_BUF(mac3);

            if (priv->iw_mode == IEEE80211_IF_TYPE_AP)
                  iwl4965_update_ps_mode(priv, fc  & IEEE80211_FCTL_PM,
                                    header->addr2);

            if (unlikely(!network_packet))
                  IWL_DEBUG_DROP("Dropping (non network): "
                               "%s, %s, %s\n",
                               print_mac(mac1, header->addr1),
                               print_mac(mac2, header->addr2),
                               print_mac(mac3, header->addr3));
            else if (unlikely(is_duplicate_packet(priv, header)))
                  IWL_DEBUG_DROP("Dropping (dup): %s, %s, %s\n",
                               print_mac(mac1, header->addr1),
                               print_mac(mac2, header->addr2),
                               print_mac(mac3, header->addr3));
            else
                  iwl4965_handle_data_packet(priv, 1, include_phy, rxb,
                                       &stats);
            break;
      }
      default:
            break;

      }
}

/* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
 * This will be used later in iwl4965_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
static void iwl4965_rx_reply_rx_phy(struct iwl_priv *priv,
                            struct iwl_rx_mem_buffer *rxb)
{
      struct iwl_rx_packet *pkt = (void *)rxb->skb->data;
      priv->last_phy_res[0] = 1;
      memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
             sizeof(struct iwl4965_rx_phy_res));
}

static void iwl4965_rx_missed_beacon_notif(struct iwl_priv *priv,
                                 struct iwl_rx_mem_buffer *rxb)

{
#ifdef CONFIG_IWLWIFI_SENSITIVITY
      struct iwl_rx_packet *pkt = (void *)rxb->skb->data;
      struct iwl_missed_beacon_notif *missed_beacon;

      missed_beacon = &pkt->u.missed_beacon;
      if (le32_to_cpu(missed_beacon->consequtive_missed_beacons) > 5) {
            IWL_DEBUG_CALIB("missed bcn cnsq %d totl %d rcd %d expctd %d\n",
                le32_to_cpu(missed_beacon->consequtive_missed_beacons),
                le32_to_cpu(missed_beacon->total_missed_becons),
                le32_to_cpu(missed_beacon->num_recvd_beacons),
                le32_to_cpu(missed_beacon->num_expected_beacons));
            priv->sensitivity_data.state = IWL_SENS_CALIB_NEED_REINIT;
            if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)))
                  queue_work(priv->workqueue, &priv->sensitivity_work);
      }
#endif /*CONFIG_IWLWIFI_SENSITIVITY*/
}

#ifdef CONFIG_IWLWIFI_HT
#ifdef CONFIG_IWLWIFI_HT_AGG

static void iwl4965_set_tx_status(struct iwl_priv *priv, int txq_id, int idx,
                          u32 status, u32 retry_count, u32 rate)
{
      struct ieee80211_tx_status *tx_status =
            &(priv->txq[txq_id].txb[idx].status);

      tx_status->flags = status ? IEEE80211_TX_STATUS_ACK : 0;
      tx_status->retry_count += retry_count;
      tx_status->control.tx_rate = rate;
}


static void iwl_sta_modify_enable_tid_tx(struct iwl_priv *priv,
                               int sta_id, int tid)
{
      unsigned long flags;

      spin_lock_irqsave(&priv->sta_lock, flags);
      priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_TID_DISABLE_TX;
      priv->stations[sta_id].sta.tid_disable_tx &= cpu_to_le16(~(1 << tid));
      priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
      spin_unlock_irqrestore(&priv->sta_lock, flags);

      iwl_send_add_station(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
}


static int iwl4965_tx_status_reply_compressed_ba(struct iwl_priv *priv,
                                     struct iwl_ht_agg *agg,
                                     struct iwl_compressed_ba_resp*
                                     ba_resp)

{
      int i, sh, ack;
      u16 ba_seq_ctl = le16_to_cpu(ba_resp->ba_seq_ctl);
      u32 bitmap0, bitmap1;
      u32 resp_bitmap0 = le32_to_cpu(ba_resp->ba_bitmap0);
      u32 resp_bitmap1 = le32_to_cpu(ba_resp->ba_bitmap1);

      if (unlikely(!agg->wait_for_ba))  {
            IWL_ERROR("Received BA when not expected\n");
            return -EINVAL;
      }
      agg->wait_for_ba = 0;
      IWL_DEBUG_TX_REPLY("BA %d %d\n", agg->start_idx, ba_resp->ba_seq_ctl);
      sh = agg->start_idx - SEQ_TO_INDEX(ba_seq_ctl>>4);
      if (sh < 0) /* tbw something is wrong with indeces */
            sh += 0x100;

      /* don't use 64 bits for now */
      bitmap0 = resp_bitmap0 >> sh;
      bitmap1 = resp_bitmap1 >> sh;
      bitmap0 |= (resp_bitmap1 & ((1<<sh)|((1<<sh)-1))) << (32 - sh);

      if (agg->frame_count > (64 - sh)) {
            IWL_DEBUG_TX_REPLY("more frames than bitmap size");
            return -1;
      }

      /* check for success or failure according to the
       * transmitted bitmap and back bitmap */
      bitmap0 &= agg->bitmap0;
      bitmap1 &= agg->bitmap1;

      for (i = 0; i < agg->frame_count ; i++) {
            int idx = (agg->start_idx + i) & 0xff;
            ack = bitmap0 & (1 << i);
            IWL_DEBUG_TX_REPLY("%s ON i=%d idx=%d raw=%d\n",
                  ack? "ACK":"NACK", i, idx, agg->start_idx + i);
            iwl4965_set_tx_status(priv, agg->txq_id, idx, ack, 0,
                  agg->rate_n_flags);

      }

      IWL_DEBUG_TX_REPLY("Bitmap %x%x\n", bitmap0, bitmap1);

      return 0;
}

static inline int iwl_queue_dec_wrap(int index, int n_bd)
{
      return (index == 0) ? n_bd - 1 : index - 1;
}

static void iwl4965_rx_reply_compressed_ba(struct iwl_priv *priv,
                                 struct iwl_rx_mem_buffer *rxb)
{
      struct iwl_rx_packet *pkt = (void *)rxb->skb->data;
      struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
      int index;
      struct iwl_tx_queue *txq = NULL;
      struct iwl_ht_agg *agg;
      u16 ba_resp_scd_flow = le16_to_cpu(ba_resp->scd_flow);
      u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);

      if (ba_resp_scd_flow >= ARRAY_SIZE(priv->txq)) {
            IWL_ERROR("BUG_ON scd_flow is bigger than number of queues");
            return;
      }

      txq = &priv->txq[ba_resp_scd_flow];
      agg = &priv->stations[ba_resp->sta_id].tid[ba_resp->tid].agg;
      index = iwl_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd);

      /* TODO: Need to get this copy more sefely - now good for debug */
/*
      {
      DECLARE_MAC_BUF(mac);
      IWL_DEBUG_TX_REPLY("REPLY_COMPRESSED_BA [%d]Received from %s, "
                     "sta_id = %d\n",
                     agg->wait_for_ba,
                     print_mac(mac, (u8*) &ba_resp->sta_addr_lo32),
                     ba_resp->sta_id);
      IWL_DEBUG_TX_REPLY("TID = %d, SeqCtl = %d, bitmap = 0x%X%X, scd_flow = "
                     "%d, scd_ssn = %d\n",
                     ba_resp->tid,
                     ba_resp->ba_seq_ctl,
                     ba_resp->ba_bitmap1,
                     ba_resp->ba_bitmap0,
                     ba_resp->scd_flow,
                     ba_resp->scd_ssn);
      IWL_DEBUG_TX_REPLY("DAT start_idx = %d, bitmap = 0x%X%X \n",
                     agg->start_idx,
                     agg->bitmap1,
                     agg->bitmap0);
      }
*/
      iwl4965_tx_status_reply_compressed_ba(priv, agg, ba_resp);
      /* releases all the TFDs until the SSN */
      if (txq->q.last_used != (ba_resp_scd_ssn & 0xff))
            iwl_tx_queue_reclaim(priv, ba_resp_scd_flow, index);

}


static void iwl4965_tx_queue_stop_scheduler(struct iwl_priv *priv, u16 txq_id)
{
      iwl_write_restricted_reg(priv,
            SCD_QUEUE_STATUS_BITS(txq_id),
            (0 << SCD_QUEUE_STTS_REG_POS_ACTIVE)|
            (1 << SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN));
}

static int iwl4965_tx_queue_set_q2ratid(struct iwl_priv *priv, u16 ra_tid,
                              u16 txq_id)
{
      u32 tbl_dw_addr;
      u32 tbl_dw;
      u16 scd_q2ratid;

      scd_q2ratid = ra_tid & SCD_QUEUE_RA_TID_MAP_RATID_MSK;

      tbl_dw_addr = priv->scd_base_addr +
                  SCD_TRANSLATE_TBL_OFFSET_QUEUE(txq_id);

      tbl_dw = iwl_read_restricted_mem(priv, tbl_dw_addr);

      if (txq_id & 0x1)
            tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF);
      else
            tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000);

      iwl_write_restricted_mem(priv, tbl_dw_addr, tbl_dw);

      return 0;
}

/**
 * txq_id must be greater than IWL_BACK_QUEUE_FIRST_ID
 */
static int iwl4965_tx_queue_agg_enable(struct iwl_priv *priv, int txq_id,
                               int tx_fifo, int sta_id, int tid,
                               u16 ssn_idx)
{
      unsigned long flags;
      int rc;
      u16 ra_tid;

      if (IWL_BACK_QUEUE_FIRST_ID > txq_id)
            IWL_WARNING("queue number too small: %d, must be > %d\n",
                  txq_id, IWL_BACK_QUEUE_FIRST_ID);

      ra_tid = BUILD_RAxTID(sta_id, tid);

      iwl_sta_modify_enable_tid_tx(priv, sta_id, tid);

      spin_lock_irqsave(&priv->lock, flags);
      rc = iwl_grab_restricted_access(priv);
      if (rc) {
            spin_unlock_irqrestore(&priv->lock, flags);
            return rc;
      }

      iwl4965_tx_queue_stop_scheduler(priv, txq_id);

      iwl4965_tx_queue_set_q2ratid(priv, ra_tid, txq_id);


      iwl_set_bits_restricted_reg(priv, SCD_QUEUECHAIN_SEL, (1<<txq_id));

      priv->txq[txq_id].q.last_used = (ssn_idx & 0xff);
      priv->txq[txq_id].q.first_empty = (ssn_idx & 0xff);

      /* supposes that ssn_idx is valid (!= 0xFFF) */
      iwl4965_set_wr_ptrs(priv, txq_id, ssn_idx);

      iwl_write_restricted_mem(priv,
                  priv->scd_base_addr + SCD_CONTEXT_QUEUE_OFFSET(txq_id),
                  (SCD_WIN_SIZE << SCD_QUEUE_CTX_REG1_WIN_SIZE_POS) &
                  SCD_QUEUE_CTX_REG1_WIN_SIZE_MSK);

      iwl_write_restricted_mem(priv, priv->scd_base_addr +
                  SCD_CONTEXT_QUEUE_OFFSET(txq_id) + sizeof(u32),
                  (SCD_FRAME_LIMIT << SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS)
                  & SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK);

      iwl_set_bits_restricted_reg(priv, SCD_INTERRUPT_MASK, (1 << txq_id));

      iwl4965_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 1);

      iwl_release_restricted_access(priv);
      spin_unlock_irqrestore(&priv->lock, flags);

      return 0;
}

/**
 * txq_id must be greater than IWL_BACK_QUEUE_FIRST_ID
 */
static int iwl4965_tx_queue_agg_disable(struct iwl_priv *priv, u16 txq_id,
                              u16 ssn_idx, u8 tx_fifo)
{
      unsigned long flags;
      int rc;

      if (IWL_BACK_QUEUE_FIRST_ID > txq_id) {
            IWL_WARNING("queue number too small: %d, must be > %d\n",
                        txq_id, IWL_BACK_QUEUE_FIRST_ID);
            return -EINVAL;
      }

      spin_lock_irqsave(&priv->lock, flags);
      rc = iwl_grab_restricted_access(priv);
      if (rc) {
            spin_unlock_irqrestore(&priv->lock, flags);
            return rc;
      }

      iwl4965_tx_queue_stop_scheduler(priv, txq_id);

      iwl_clear_bits_restricted_reg(priv, SCD_QUEUECHAIN_SEL, (1 << txq_id));

      priv->txq[txq_id].q.last_used = (ssn_idx & 0xff);
      priv->txq[txq_id].q.first_empty = (ssn_idx & 0xff);
      /* supposes that ssn_idx is valid (!= 0xFFF) */
      iwl4965_set_wr_ptrs(priv, txq_id, ssn_idx);

      iwl_clear_bits_restricted_reg(priv, SCD_INTERRUPT_MASK, (1 << txq_id));
      iwl4965_txq_ctx_deactivate(priv, txq_id);
      iwl4965_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 0);

      iwl_release_restricted_access(priv);
      spin_unlock_irqrestore(&priv->lock, flags);

      return 0;
}

#endif/* CONFIG_IWLWIFI_HT_AGG */
#endif /* CONFIG_IWLWIFI_HT */
/*
 * RATE SCALE CODE
 */
int iwl4965_init_hw_rates(struct iwl_priv *priv, struct ieee80211_rate *rates)
{
      return 0;
}


/**
 * iwl4965_add_station - Initialize a station's hardware rate table
 *
 * The uCode contains a table of fallback rates and retries per rate
 * for automatic fallback during transmission.
 *
 * NOTE: This initializes the table for a single retry per data rate
 * which is not optimal.  Setting up an intelligent retry per rate
 * requires feedback from transmission, which isn't exposed through
 * rc80211_simple which is what this driver is currently using.
 *
 */
void iwl4965_add_station(struct iwl_priv *priv, const u8 *addr, int is_ap)
{
      int i, r;
      struct iwl_link_quality_cmd link_cmd = {
            .reserved1 = 0,
      };
      u16 rate_flags;

      /* Set up the rate scaling to start at 54M and fallback
       * all the way to 1M in IEEE order and then spin on IEEE */
      if (is_ap)
            r = IWL_RATE_54M_INDEX;
      else if (priv->phymode == MODE_IEEE80211A)
            r = IWL_RATE_6M_INDEX;
      else
            r = IWL_RATE_1M_INDEX;

      for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
            rate_flags = 0;
            if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
                  rate_flags |= RATE_MCS_CCK_MSK;

            rate_flags |= RATE_MCS_ANT_B_MSK;
            rate_flags &= ~RATE_MCS_ANT_A_MSK;
            link_cmd.rs_table[i].rate_n_flags =
                  iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
            r = iwl_get_prev_ieee_rate(r);
      }

      link_cmd.general_params.single_stream_ant_msk = 2;
      link_cmd.general_params.dual_stream_ant_msk = 3;
      link_cmd.agg_params.agg_dis_start_th = 3;
      link_cmd.agg_params.agg_time_limit = cpu_to_le16(4000);

      /* Update the rate scaling for control frame Tx to AP */
      link_cmd.sta_id = is_ap ? IWL_AP_ID : IWL4965_BROADCAST_ID;

      iwl_send_cmd_pdu(priv, REPLY_TX_LINK_QUALITY_CMD, sizeof(link_cmd),
                   &link_cmd);
}

#ifdef CONFIG_IWLWIFI_HT

static u8 iwl_is_channel_extension(struct iwl_priv *priv, int phymode,
                           u16 channel, u8 extension_chan_offset)
{
      const struct iwl_channel_info *ch_info;

      ch_info = iwl_get_channel_info(priv, phymode, channel);
      if (!is_channel_valid(ch_info))
            return 0;

      if (extension_chan_offset == IWL_EXT_CHANNEL_OFFSET_AUTO)
            return 0;

      if ((ch_info->fat_extension_channel == extension_chan_offset) ||
          (ch_info->fat_extension_channel == HT_IE_EXT_CHANNEL_MAX))
            return 1;

      return 0;
}

static u8 iwl_is_fat_tx_allowed(struct iwl_priv *priv,
                        const struct sta_ht_info *ht_info)
{

      if (priv->channel_width != IWL_CHANNEL_WIDTH_40MHZ)
            return 0;

      if (ht_info->supported_chan_width != IWL_CHANNEL_WIDTH_40MHZ)
            return 0;

      if (ht_info->extension_chan_offset == IWL_EXT_CHANNEL_OFFSET_AUTO)
            return 0;

      /* no fat tx allowed on 2.4GHZ */
      if (priv->phymode != MODE_IEEE80211A)
            return 0;
      return (iwl_is_channel_extension(priv, priv->phymode,
                               ht_info->control_channel,
                               ht_info->extension_chan_offset));
}

void iwl4965_set_rxon_ht(struct iwl_priv *priv, struct sta_ht_info *ht_info)
{
      struct iwl_rxon_cmd *rxon = &priv->staging_rxon;
      u32 val;

      if (!ht_info->is_ht)
            return;

      if (iwl_is_fat_tx_allowed(priv, ht_info))
            rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED_MSK;
      else
            rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MIXED_MSK |
                         RXON_FLG_CHANNEL_MODE_PURE_40_MSK);

      if (le16_to_cpu(rxon->channel) != ht_info->control_channel) {
            IWL_DEBUG_ASSOC("control diff than current %d %d\n",
                        le16_to_cpu(rxon->channel),
                        ht_info->control_channel);
            rxon->channel = cpu_to_le16(ht_info->control_channel);
            return;
      }

      /* Note: control channel is oposit to extension channel */
      switch (ht_info->extension_chan_offset) {
      case IWL_EXT_CHANNEL_OFFSET_ABOVE:
            rxon->flags &= ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
            break;
      case IWL_EXT_CHANNEL_OFFSET_BELOW:
            rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
            break;
      case IWL_EXT_CHANNEL_OFFSET_AUTO:
            rxon->flags &= ~RXON_FLG_CHANNEL_MODE_MIXED_MSK;
            break;
      default:
            rxon->flags &= ~RXON_FLG_CHANNEL_MODE_MIXED_MSK;
            break;
      }

      val = ht_info->operating_mode;

      rxon->flags |= cpu_to_le32(val << RXON_FLG_HT_OPERATING_MODE_POS);

      priv->active_rate_ht[0] = ht_info->supp_rates[0];
      priv->active_rate_ht[1] = ht_info->supp_rates[1];
      iwl4965_set_rxon_chain(priv);

      IWL_DEBUG_ASSOC("supported HT rate 0x%X %X "
                  "rxon flags 0x%X operation mode :0x%X "
                  "extension channel offset 0x%x "
                  "control chan %d\n",
                  priv->active_rate_ht[0], priv->active_rate_ht[1],
                  le32_to_cpu(rxon->flags), ht_info->operating_mode,
                  ht_info->extension_chan_offset,
                  ht_info->control_channel);
      return;
}

void iwl4965_set_ht_add_station(struct iwl_priv *priv, u8 index)
{
      __le32 sta_flags;
      struct sta_ht_info *ht_info = &priv->current_assoc_ht;

      priv->current_channel_width = IWL_CHANNEL_WIDTH_20MHZ;
      if (!ht_info->is_ht)
            goto done;

      sta_flags = priv->stations[index].sta.station_flags;

      if (ht_info->tx_mimo_ps_mode == IWL_MIMO_PS_DYNAMIC)
            sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
      else
            sta_flags &= ~STA_FLG_RTS_MIMO_PROT_MSK;

      sta_flags |= cpu_to_le32(
            (u32)ht_info->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);

      sta_flags |= cpu_to_le32(
            (u32)ht_info->mpdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);

      sta_flags &= (~STA_FLG_FAT_EN_MSK);
      ht_info->tx_chan_width = IWL_CHANNEL_WIDTH_20MHZ;
      ht_info->chan_width_cap = IWL_CHANNEL_WIDTH_20MHZ;

      if (iwl_is_fat_tx_allowed(priv, ht_info)) {
            sta_flags |= STA_FLG_FAT_EN_MSK;
            ht_info->chan_width_cap = IWL_CHANNEL_WIDTH_40MHZ;
            if (ht_info->supported_chan_width == IWL_CHANNEL_WIDTH_40MHZ)
                  ht_info->tx_chan_width = IWL_CHANNEL_WIDTH_40MHZ;
      }
      priv->current_channel_width = ht_info->tx_chan_width;
      priv->stations[index].sta.station_flags = sta_flags;
 done:
      return;
}

#ifdef CONFIG_IWLWIFI_HT_AGG

static void iwl4965_sta_modify_add_ba_tid(struct iwl_priv *priv,
                                int sta_id, int tid, u16 ssn)
{
      unsigned long flags;

      spin_lock_irqsave(&priv->sta_lock, flags);
      priv->stations[sta_id].sta.station_flags_msk = 0;
      priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
      priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
      priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
      priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
      spin_unlock_irqrestore(&priv->sta_lock, flags);

      iwl_send_add_station(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
}

static void iwl4965_sta_modify_del_ba_tid(struct iwl_priv *priv,
                                int sta_id, int tid)
{
      unsigned long flags;

      spin_lock_irqsave(&priv->sta_lock, flags);
      priv->stations[sta_id].sta.station_flags_msk = 0;
      priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
      priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
      priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
      spin_unlock_irqrestore(&priv->sta_lock, flags);

      iwl_send_add_station(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
}

static const u16 default_tid_to_tx_fifo[] = {
      IWL_TX_FIFO_AC1,
      IWL_TX_FIFO_AC0,
      IWL_TX_FIFO_AC0,
      IWL_TX_FIFO_AC1,
      IWL_TX_FIFO_AC2,
      IWL_TX_FIFO_AC2,
      IWL_TX_FIFO_AC3,
      IWL_TX_FIFO_AC3,
      IWL_TX_FIFO_NONE,
      IWL_TX_FIFO_NONE,
      IWL_TX_FIFO_NONE,
      IWL_TX_FIFO_NONE,
      IWL_TX_FIFO_NONE,
      IWL_TX_FIFO_NONE,
      IWL_TX_FIFO_NONE,
      IWL_TX_FIFO_NONE,
      IWL_TX_FIFO_AC3
};

static int iwl_txq_ctx_activate_free(struct iwl_priv *priv)
{
      int txq_id;

      for (txq_id = 0; txq_id < priv->hw_setting.max_txq_num; txq_id++)
            if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk))
                  return txq_id;
      return -1;
}

int iwl_mac_ht_tx_agg_start(struct ieee80211_hw *hw, u8 *da, u16 tid,
                      u16 *start_seq_num)
{

      struct iwl_priv *priv = hw->priv;
      int sta_id;
      int tx_fifo;
      int txq_id;
      int ssn = -1;
      unsigned long flags;
      struct iwl_tid_data *tid_data;
      DECLARE_MAC_BUF(mac);

      if (likely(tid < ARRAY_SIZE(default_tid_to_tx_fifo)))
            tx_fifo = default_tid_to_tx_fifo[tid];
      else
            return -EINVAL;

      IWL_WARNING("iwl-AGG iwl_mac_ht_tx_agg_start on da=%s"
                " tid=%d\n", print_mac(mac, da), tid);

      sta_id = iwl_hw_find_station(priv, da);
      if (sta_id == IWL_INVALID_STATION)
            return -ENXIO;

      txq_id = iwl_txq_ctx_activate_free(priv);
      if (txq_id == -1)
            return -ENXIO;

      spin_lock_irqsave(&priv->sta_lock, flags);
      tid_data = &priv->stations[sta_id].tid[tid];
      ssn = SEQ_TO_SN(tid_data->seq_number);
      tid_data->agg.txq_id = txq_id;
      spin_unlock_irqrestore(&priv->sta_lock, flags);

      *start_seq_num = ssn;
      iwl4965_ba_status(priv, tid, BA_STATUS_ACTIVE);
      return iwl4965_tx_queue_agg_enable(priv, txq_id, tx_fifo,
                                 sta_id, tid, ssn);
}


int iwl_mac_ht_tx_agg_stop(struct ieee80211_hw *hw, u8 *da, u16 tid,
                     int generator)
{

      struct iwl_priv *priv = hw->priv;
      int tx_fifo_id, txq_id, sta_id, ssn = -1;
      struct iwl_tid_data *tid_data;
      int rc;
      DECLARE_MAC_BUF(mac);

      if (!da) {
            IWL_ERROR("%s: da = NULL\n", __func__);
            return -EINVAL;
      }

      if (likely(tid < ARRAY_SIZE(default_tid_to_tx_fifo)))
            tx_fifo_id = default_tid_to_tx_fifo[tid];
      else
            return -EINVAL;

      sta_id = iwl_hw_find_station(priv, da);

      if (sta_id == IWL_INVALID_STATION)
            return -ENXIO;

      tid_data = &priv->stations[sta_id].tid[tid];
      ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
      txq_id = tid_data->agg.txq_id;

      rc = iwl4965_tx_queue_agg_disable(priv, txq_id, ssn, tx_fifo_id);
      /* FIXME: need more safe way to handle error condition */
      if (rc)
            return rc;

      iwl4965_ba_status(priv, tid, BA_STATUS_INITIATOR_DELBA);
      IWL_DEBUG_INFO("iwl_mac_ht_tx_agg_stop on da=%s tid=%d\n",
                   print_mac(mac, da), tid);

      return 0;
}

int iwl_mac_ht_rx_agg_start(struct ieee80211_hw *hw, u8 *da,
                      u16 tid, u16 start_seq_num)
{
      struct iwl_priv *priv = hw->priv;
      int sta_id;
      DECLARE_MAC_BUF(mac);

      IWL_WARNING("iwl-AGG iwl_mac_ht_rx_agg_start on da=%s"
                " tid=%d\n", print_mac(mac, da), tid);
      sta_id = iwl_hw_find_station(priv, da);
      iwl4965_sta_modify_add_ba_tid(priv, sta_id, tid, start_seq_num);
      return 0;
}

int iwl_mac_ht_rx_agg_stop(struct ieee80211_hw *hw, u8 *da,
                     u16 tid, int generator)
{
      struct iwl_priv *priv = hw->priv;
      int sta_id;
      DECLARE_MAC_BUF(mac);

      IWL_WARNING("iwl-AGG iwl_mac_ht_rx_agg_stop on da=%s tid=%d\n",
                print_mac(mac, da), tid);
      sta_id = iwl_hw_find_station(priv, da);
      iwl4965_sta_modify_del_ba_tid(priv, sta_id, tid);
      return 0;
}

#endif /* CONFIG_IWLWIFI_HT_AGG */
#endif /* CONFIG_IWLWIFI_HT */

/* Set up 4965-specific Rx frame reply handlers */
void iwl_hw_rx_handler_setup(struct iwl_priv *priv)
{
      /* Legacy Rx frames */
      priv->rx_handlers[REPLY_4965_RX] = iwl4965_rx_reply_rx;

      /* High-throughput (HT) Rx frames */
      priv->rx_handlers[REPLY_RX_PHY_CMD] = iwl4965_rx_reply_rx_phy;
      priv->rx_handlers[REPLY_RX_MPDU_CMD] = iwl4965_rx_reply_rx;

      priv->rx_handlers[MISSED_BEACONS_NOTIFICATION] =
          iwl4965_rx_missed_beacon_notif;

#ifdef CONFIG_IWLWIFI_HT
#ifdef CONFIG_IWLWIFI_HT_AGG
      priv->rx_handlers[REPLY_COMPRESSED_BA] = iwl4965_rx_reply_compressed_ba;
#endif /* CONFIG_IWLWIFI_AGG */
#endif /* CONFIG_IWLWIFI */
}

void iwl_hw_setup_deferred_work(struct iwl_priv *priv)
{
      INIT_WORK(&priv->txpower_work, iwl4965_bg_txpower_work);
      INIT_WORK(&priv->statistics_work, iwl4965_bg_statistics_work);
#ifdef CONFIG_IWLWIFI_SENSITIVITY
      INIT_WORK(&priv->sensitivity_work, iwl4965_bg_sensitivity_work);
#endif
#ifdef CONFIG_IWLWIFI_HT
#ifdef CONFIG_IWLWIFI_HT_AGG
      INIT_WORK(&priv->agg_work, iwl4965_bg_agg_work);
#endif /* CONFIG_IWLWIFI_AGG */
#endif /* CONFIG_IWLWIFI_HT */
      init_timer(&priv->statistics_periodic);
      priv->statistics_periodic.data = (unsigned long)priv;
      priv->statistics_periodic.function = iwl4965_bg_statistics_periodic;
}

void iwl_hw_cancel_deferred_work(struct iwl_priv *priv)
{
      del_timer_sync(&priv->statistics_periodic);

      cancel_delayed_work(&priv->init_alive_start);
}

struct pci_device_id iwl_hw_card_ids[] = {
      {0x8086, 0x4229, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
      {0x8086, 0x4230, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
      {0}
};

int iwl_eeprom_aqcuire_semaphore(struct iwl_priv *priv)
{
      u16 count;
      int rc;

      for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
            iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
                  CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
            rc = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
                              CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
                              CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
                              EEPROM_SEM_TIMEOUT);
            if (rc >= 0) {
                  IWL_DEBUG_IO("Aqcuired semaphore after %d tries.\n",
                        count+1);
                  return rc;
            }
      }

      return rc;
}

inline void iwl_eeprom_release_semaphore(struct iwl_priv *priv)
{
      iwl_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
            CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
}


MODULE_DEVICE_TABLE(pci, iwl_hw_card_ids);

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