drivers/net/wireless/iwlwifi/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>

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

static void iwl4965_hw_card_show_info(struct iwl4965_priv *priv);

#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 iwl4965_rate_info iwl4965_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 iwl4965_priv *priv)
{
#ifdef CONFIG_IWL4965_HT
	if (!priv->current_ht_config.is_ht ||
	    (priv->current_ht_config.supp_mcs_set[1] == 0) ||
	    (priv->ps_mode == IWL_MIMO_PS_STATIC))
		return 1;
#else
	return 1;
#endif	/*CONFIG_IWL4965_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 iwl4965_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 iwl4965_hw_rxq_stop(struct iwl4965_priv *priv)
{
	int rc;
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	rc = iwl4965_grab_nic_access(priv);
	if (rc) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return rc;
	}

	/* stop Rx DMA */
	iwl4965_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
	rc = iwl4965_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
				     (1 << 24), 1000);
	if (rc < 0)
		IWL_ERROR("Can't stop Rx DMA.\n");

	iwl4965_release_nic_access(priv);
	spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

u8 iwl4965_hw_find_station(struct iwl4965_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 iwl4965_priv *priv, int pwr_max)
{
	int ret;
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	ret = iwl4965_grab_nic_access(priv);
	if (ret) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return ret;
	}

	if (!pwr_max) {
		u32 val;

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

		if (val & PCI_CFG_PMC_PME_FROM_D3COLD_SUPPORT)
			iwl4965_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
				APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
				~APMG_PS_CTRL_MSK_PWR_SRC);
	} else
		iwl4965_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
			APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
			~APMG_PS_CTRL_MSK_PWR_SRC);

	iwl4965_release_nic_access(priv);
	spin_unlock_irqrestore(&priv->lock, flags);

	return ret;
}

static int iwl4965_rx_init(struct iwl4965_priv *priv, struct iwl4965_rx_queue *rxq)
{
	int rc;
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	rc = iwl4965_grab_nic_access(priv);
	if (rc) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return rc;
	}

	/* Stop Rx DMA */
	iwl4965_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);

	/* Reset driver's Rx queue write index */
	iwl4965_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);

	/* Tell device where to find RBD circular buffer in DRAM */
	iwl4965_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
			     rxq->dma_addr >> 8);

	/* Tell device where in DRAM to update its Rx status */
	iwl4965_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
			     (priv->hw_setting.shared_phys +
			      offsetof(struct iwl4965_shared, val0)) >> 4);

	/* Enable Rx DMA, enable host interrupt, Rx buffer size 4k, 256 RBDs */
	iwl4965_write_direct32(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));

	/*
	 * iwl4965_write32(priv,CSR_INT_COAL_REG,0);
	 */

	iwl4965_release_nic_access(priv);
	spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

/* Tell 4965 where to find the "keep warm" buffer */
static int iwl4965_kw_init(struct iwl4965_priv *priv)
{
	unsigned long flags;
	int rc;

	spin_lock_irqsave(&priv->lock, flags);
	rc = iwl4965_grab_nic_access(priv);
	if (rc)
		goto out;

	iwl4965_write_direct32(priv, IWL_FH_KW_MEM_ADDR_REG,
			     priv->kw.dma_addr >> 4);
	iwl4965_release_nic_access(priv);
out:
	spin_unlock_irqrestore(&priv->lock, flags);
	return rc;
}

static int iwl4965_kw_alloc(struct iwl4965_priv *priv)
{
	struct pci_dev *dev = priv->pci_dev;
	struct iwl4965_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 " " : "")

/**
 * iwl4965_set_fat_chan_info - Copy fat channel info into driver's priv.
 *
 * Does not set up a command, or touch hardware.
 */
int iwl4965_set_fat_chan_info(struct iwl4965_priv *priv, int phymode, u16 channel,
			      const struct iwl4965_eeprom_channel *eeprom_ch,
			      u8 fat_extension_channel)
{
	struct iwl4965_channel_info *ch_info;

	ch_info = (struct iwl4965_channel_info *)
			iwl4965_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;
}

/**
 * iwl4965_kw_free - Free the "keep warm" buffer
 */
static void iwl4965_kw_free(struct iwl4965_priv *priv)
{
	struct pci_dev *dev = priv->pci_dev;
	struct iwl4965_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 iwl4965_priv *priv)
{
	int rc = 0;
	int txq_id, slots_num;
	unsigned long flags;

	iwl4965_kw_free(priv);

	/* Free all tx/cmd queues and keep-warm buffer */
	iwl4965_hw_txq_ctx_free(priv);

	/* Alloc keep-warm buffer */
	rc = iwl4965_kw_alloc(priv);
	if (rc) {
		IWL_ERROR("Keep Warm allocation failed");
		goto error_kw;
	}

	spin_lock_irqsave(&priv->lock, flags);

	rc = iwl4965_grab_nic_access(priv);
	if (unlikely(rc)) {
		IWL_ERROR("TX reset failed");
		spin_unlock_irqrestore(&priv->lock, flags);
		goto error_reset;
	}

	/* Turn off all Tx DMA channels */
	iwl4965_write_prph(priv, KDR_SCD_TXFACT, 0);
	iwl4965_release_nic_access(priv);
	spin_unlock_irqrestore(&priv->lock, flags);

	/* Tell 4965 where to find the keep-warm buffer */
	rc = iwl4965_kw_init(priv);
	if (rc) {
		IWL_ERROR("kw_init failed\n");
		goto error_reset;
	}

	/* Alloc and init all (default 16) Tx queues,
	 * including the command queue (#4) */
	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 = iwl4965_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:
	iwl4965_hw_txq_ctx_free(priv);
 error_reset:
	iwl4965_kw_free(priv);
 error_kw:
	return rc;
}

int iwl4965_hw_nic_init(struct iwl4965_priv *priv)
{
	int rc;
	unsigned long flags;
	struct iwl4965_rx_queue *rxq = &priv->rxq;
	u8 rev_id;
	u32 val;
	u8 val_link;

	iwl4965_power_init_handle(priv);

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

	iwl4965_set_bit(priv, CSR_GIO_CHICKEN_BITS,
		    CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);

	iwl4965_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
	rc = iwl4965_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 = iwl4965_grab_nic_access(priv);
	if (rc) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return rc;
	}

	iwl4965_read_prph(priv, APMG_CLK_CTRL_REG);

	iwl4965_write_prph(priv, APMG_CLK_CTRL_REG,
				 APMG_CLK_VAL_DMA_CLK_RQT |
				 APMG_CLK_VAL_BSM_CLK_RQT);
	iwl4965_read_prph(priv, APMG_CLK_CTRL_REG);

	udelay(20);

	iwl4965_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
				    APMG_PCIDEV_STT_VAL_L1_ACT_DIS);

	iwl4965_release_nic_access(priv);
	iwl4965_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 = iwl4965_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 */

	iwl4965_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 = iwl4965_grab_nic_access(priv);
	if (rc < 0) {
		spin_unlock_irqrestore(&priv->lock, flags);
		IWL_DEBUG_INFO("Failed to init the card\n");
		return rc;
	}

	iwl4965_read_prph(priv, APMG_PS_CTRL_REG);
	iwl4965_set_bits_prph(priv, APMG_PS_CTRL_REG,
				    APMG_PS_CTRL_VAL_RESET_REQ);
	udelay(5);
	iwl4965_clear_bits_prph(priv, APMG_PS_CTRL_REG,
				      APMG_PS_CTRL_VAL_RESET_REQ);

	iwl4965_release_nic_access(priv);
	spin_unlock_irqrestore(&priv->lock, flags);

	iwl4965_hw_card_show_info(priv);

	/* end nic_init */

	/* Allocate the RX queue, or reset if it is already allocated */
	if (!rxq->bd) {
		rc = iwl4965_rx_queue_alloc(priv);
		if (rc) {
			IWL_ERROR("Unable to initialize Rx queue\n");
			return -ENOMEM;
		}
	} else
		iwl4965_rx_queue_reset(priv, rxq);

	iwl4965_rx_replenish(priv);

	iwl4965_rx_init(priv, rxq);

	spin_lock_irqsave(&priv->lock, flags);

	rxq->need_update = 1;
	iwl4965_rx_queue_update_write_ptr(priv, rxq);

	spin_unlock_irqrestore(&priv->lock, flags);

	/* Allocate and init all Tx and Command queues */
	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 iwl4965_hw_nic_stop_master(struct iwl4965_priv *priv)
{
	int rc = 0;
	u32 reg_val;
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);

	/* set stop master bit */
	iwl4965_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);

	reg_val = iwl4965_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 = iwl4965_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;
}

/**
 * iwl4965_hw_txq_ctx_stop - Stop all Tx DMA channels, free Tx queue memory
 */
void iwl4965_hw_txq_ctx_stop(struct iwl4965_priv *priv)
{

	int txq_id;
	unsigned long flags;

	/* Stop each Tx DMA channel, and wait for it to be idle */
	for (txq_id = 0; txq_id < priv->hw_setting.max_txq_num; txq_id++) {
		spin_lock_irqsave(&priv->lock, flags);
		if (iwl4965_grab_nic_access(priv)) {
			spin_unlock_irqrestore(&priv->lock, flags);
			continue;
		}

		iwl4965_write_direct32(priv,
				     IWL_FH_TCSR_CHNL_TX_CONFIG_REG(txq_id),
				     0x0);
		iwl4965_poll_direct_bit(priv, IWL_FH_TSSR_TX_STATUS_REG,
					IWL_FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE
					(txq_id), 200);
		iwl4965_release_nic_access(priv);
		spin_unlock_irqrestore(&priv->lock, flags);
	}

	/* Deallocate memory for all Tx queues */
	iwl4965_hw_txq_ctx_free(priv);
}

int iwl4965_hw_nic_reset(struct iwl4965_priv *priv)
{
	int rc = 0;
	unsigned long flags;

	iwl4965_hw_nic_stop_master(priv);

	spin_lock_irqsave(&priv->lock, flags);

	iwl4965_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);

	udelay(10);

	iwl4965_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
	rc = iwl4965_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 = iwl4965_grab_nic_access(priv);
	if (!rc) {
		iwl4965_write_prph(priv, APMG_CLK_EN_REG,
					 APMG_CLK_VAL_DMA_CLK_RQT |
					 APMG_CLK_VAL_BSM_CLK_RQT);

		udelay(10);

		iwl4965_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
				APMG_PCIDEV_STT_VAL_L1_ACT_DIS);

		iwl4965_release_nic_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 iwl4965_priv *priv = (struct iwl4965_priv *)data;

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

/**
 * iwl4965_bg_statistics_work - Send the statistics request to the hardware.
 *
 * This is queued by iwl4965_bg_statistics_periodic.
 */
static void iwl4965_bg_statistics_work(struct work_struct *work)
{
	struct iwl4965_priv *priv = container_of(work, struct iwl4965_priv,
					     statistics_work);

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

	mutex_lock(&priv->mutex);
	iwl4965_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 iwl4965_priv *priv)
{
	struct iwl4965_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);
	iwl4965_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 = iwl4965_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_IWL4965_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 iwl4965_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 iwl4965_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 iwl4965_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 iwl4965_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 iwl4965_sensitivity_callback(struct iwl4965_priv *priv,
				    struct iwl4965_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 iwl4965_priv *priv, u8 flags)
{
	int rc = 0;
	struct iwl4965_sensitivity_cmd cmd ;
	struct iwl4965_sensitivity_data *data = NULL;
	struct iwl4965_host_cmd cmd_out = {
		.id = SENSITIVITY_CMD,
		.len = sizeof(struct iwl4965_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);

	/* Update uCode's "work" table, and copy it to DSP */
	cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;

	if (flags & CMD_ASYNC)
		cmd_out.meta.u.callback = iwl4965_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 = iwl4965_send_cmd(priv, &cmd_out);
	if (!rc) {
		IWL_DEBUG_CALIB("SENSITIVITY_CMD succeeded\n");
		return rc;
	}

	return 0;
}

void iwl4965_init_sensitivity(struct iwl4965_priv *priv, u8 flags, u8 force)
{
	int rc = 0;
	int i;
	struct iwl4965_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 iwl4965_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 iwl4965_priv *priv)
{
	struct iwl4965_chain_noise_data *data = NULL;
	int rc = 0;

	data = &(priv->chain_noise_data);
	if ((data->state == IWL_CHAIN_NOISE_ALIVE) && iwl4965_is_associated(priv)) {
		struct iwl4965_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 = iwl4965_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 iwl4965_priv *priv,
				      struct iwl4965_notif_statistics *stat_resp)
{
	struct iwl4965_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 iwl4965_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 = iwl4965_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 iwl4965_priv *priv,
					    struct iwl4965_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 iwl4965_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 (!iwl4965_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 iwl4965_priv *priv = container_of(work, struct iwl4965_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_IWL4965_SENSITIVITY*/

static void iwl4965_bg_txpower_work(struct work_struct *work)
{
	struct iwl4965_priv *priv = container_of(work, struct iwl4965_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 */
	iwl4965_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 iwl4965_priv *priv, int txq_id, u32 index)
{
	iwl4965_write_direct32(priv, HBUS_TARG_WRPTR,
			     (index & 0xff) | (txq_id << 8));
	iwl4965_write_prph(priv, KDR_SCD_QUEUE_RDPTR(txq_id), index);
}

/**
 * iwl4965_tx_queue_set_status - (optionally) start Tx/Cmd queue
 * @tx_fifo_id: Tx DMA/FIFO channel (range 0-7) that the queue will feed
 * @scd_retry: (1) Indicates queue will be used in aggregation mode
 *
 * NOTE:  Acquire priv->lock before calling this function !
 */
static void iwl4965_tx_queue_set_status(struct iwl4965_priv *priv,
					struct iwl4965_tx_queue *txq,
					int tx_fifo_id, int scd_retry)
{
	int txq_id = txq->q.id;

	/* Find out whether to activate Tx queue */
	int active = test_bit(txq_id, &priv->txq_ctx_active_msk)?1:0;

	/* Set up and activate */
	iwl4965_write_prph(priv, KDR_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 ? "Activate" : "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 iwl4965_priv *priv, int txq_id)
{
	set_bit(txq_id, &priv->txq_ctx_active_msk);
}

static inline void iwl4965_txq_ctx_deactivate(struct iwl4965_priv *priv, int txq_id)
{
	clear_bit(txq_id, &priv->txq_ctx_active_msk);
}

int iwl4965_alive_notify(struct iwl4965_priv *priv)
{
	u32 a;
	int i = 0;
	unsigned long flags;
	int rc;

	spin_lock_irqsave(&priv->lock, flags);

#ifdef CONFIG_IWL4965_SENSITIVITY
	memset(&(priv->sensitivity_data), 0,
	       sizeof(struct iwl4965_sensitivity_data));
	memset(&(priv->chain_noise_data), 0,
	       sizeof(struct iwl4965_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_IWL4965_SENSITIVITY*/
	rc = iwl4965_grab_nic_access(priv);
	if (rc) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return rc;
	}

	/* Clear 4965's internal Tx Scheduler data base */
	priv->scd_base_addr = iwl4965_read_prph(priv, KDR_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)
		iwl4965_write_targ_mem(priv, a, 0);
	for (; a < priv->scd_base_addr + SCD_TRANSLATE_TBL_OFFSET; a += 4)
		iwl4965_write_targ_mem(priv, a, 0);
	for (; a < sizeof(u16) * priv->hw_setting.max_txq_num; a += 4)
		iwl4965_write_targ_mem(priv, a, 0);

	/* Tel 4965 where to find Tx byte count tables */
	iwl4965_write_prph(priv, KDR_SCD_DRAM_BASE_ADDR,
		(priv->hw_setting.shared_phys +
		 offsetof(struct iwl4965_shared, queues_byte_cnt_tbls)) >> 10);

	/* Disable chain mode for all queues */
	iwl4965_write_prph(priv, KDR_SCD_QUEUECHAIN_SEL, 0);

	/* Initialize each Tx queue (including the command queue) */
	for (i = 0; i < priv->hw_setting.max_txq_num; i++) {

		/* TFD circular buffer read/write indexes */
		iwl4965_write_prph(priv, KDR_SCD_QUEUE_RDPTR(i), 0);
		iwl4965_write_direct32(priv, HBUS_TARG_WRPTR, 0 | (i << 8));

		/* Max Tx Window size for Scheduler-ACK mode */
		iwl4965_write_targ_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);

		/* Frame limit */
		iwl4965_write_targ_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);

	}
	iwl4965_write_prph(priv, KDR_SCD_INTERRUPT_MASK,
				 (1 << priv->hw_setting.max_txq_num) - 1);

	/* Activate all Tx DMA/FIFO channels */
	iwl4965_write_prph(priv, KDR_SCD_TXFACT,
				 SCD_TXFACT_REG_TXFIFO_MASK(0, 7));

	iwl4965_set_wr_ptrs(priv, IWL_CMD_QUEUE_NUM, 0);

	/* Map each Tx/cmd queue to its corresponding fifo */
	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);
	}

	iwl4965_release_nic_access(priv);
	spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

/**
 * iwl4965_hw_set_hw_setting
 *
 * Called when initializing driver
 */
int iwl4965_hw_set_hw_setting(struct iwl4965_priv *priv)
{
	/* Allocate area for Tx byte count tables and Rx queue status */
	priv->hw_setting.shared_virt =
	    pci_alloc_consistent(priv->pci_dev,
				 sizeof(struct iwl4965_shared),
				 &priv->hw_setting.shared_phys);

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

	memset(priv->hw_setting.shared_virt, 0, sizeof(struct iwl4965_shared));

	priv->hw_setting.max_txq_num = iwl4965_param_queues_num;
	priv->hw_setting.ac_queue_count = AC_NUM;
	priv->hw_setting.tx_cmd_len = sizeof(struct iwl4965_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;
}

/**
 * iwl4965_hw_txq_ctx_free - Free TXQ Context
 *
 * Destroy all TX DMA queues and structures
 */
void iwl4965_hw_txq_ctx_free(struct iwl4965_priv *priv)
{
	int txq_id;

	/* Tx queues */
	for (txq_id = 0; txq_id < priv->hw_setting.max_txq_num; txq_id++)
		iwl4965_tx_queue_free(priv, &priv->txq[txq_id]);

	/* Keep-warm buffer */
	iwl4965_kw_free(priv);
}

/**
 * iwl4965_hw_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
 *
 * Does NOT advance any TFD circular buffer read/write indexes
 * Does NOT free the TFD itself (which is within circular buffer)
 */
int iwl4965_hw_txq_free_tfd(struct iwl4965_priv *priv, struct iwl4965_tx_queue *txq)
{
	struct iwl4965_tfd_frame *bd_tmp = (struct iwl4965_tfd_frame *)&txq->bd[0];
	struct iwl4965_tfd_frame *bd = &bd_tmp[txq->q.read_ptr];
	struct pci_dev *dev = priv->pci_dev;
	int i;
	int counter = 0;
	int index, is_odd;

	/* Host command buffers stay mapped in memory, nothing to clean */
	if (txq->q.id == IWL_CMD_QUEUE_NUM)
		return 0;

	/* Sanity check on number of chunks */
	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.
	 * TFD info for odd chunks is different format than for even chunks. */
	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);

		/* Free SKB, if any, for this chunk */
		if (txq->txb[txq->q.read_ptr].skb[i]) {
			struct sk_buff *skb = txq->txb[txq->q.read_ptr].skb[i];

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

int iwl4965_hw_reg_set_txpower(struct iwl4965_priv *priv, s8 power)
{
	IWL_ERROR("TODO: Implement iwl4965_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;
}

/**
 * iwl4965_get_voltage_compensation - Power supply voltage comp for txpower
 *
 * Determines power supply voltage compensation for txpower calculations.
 * Returns number of 1/2-dB steps to subtract from gain table index,
 * to compensate for difference between power supply voltage during
 * factory measurements, vs. current power supply voltage.
 *
 * Voltage indication is higher for lower voltage.
 * Lower voltage requires more gain (lower gain table index).
 */
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 iwl4965_channel_info *
iwl4965_get_channel_txpower_info(struct iwl4965_priv *priv, u8 phymode, u16 channel)
{
	const struct iwl4965_channel_info *ch_info;

	ch_info = iwl4965_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 iwl4965_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;
	}
}

/**
 * iwl4965_interpolate_chan - Interpolate factory measurements for one channel
 *
 * Interpolates factory measurements from the two sample channels within a
 * sub-band, to apply to channel of interest.  Interpolation is proportional to
 * differences in channel frequencies, which is proportional to differences
 * in channel number.
 */
static int iwl4965_interpolate_chan(struct iwl4965_priv *priv, u32 channel,
				    struct iwl4965_eeprom_calib_ch_info *chan_info)
{
	s32 s = -1;
	u32 c;
	u32 m;
	const struct iwl4965_eeprom_calib_measure *m1;
	const struct iwl4965_eeprom_calib_measure *m2;
	struct iwl4965_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 iwl4965_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 iwl4965_priv *priv, u8 band, u16 channel,
				    u8 is_fat, u8 ctrl_chan_high,
				    struct iwl4965_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 iwl4965_channel_info *ch_info = NULL;
	struct iwl4965_eeprom_calib_ch_info ch_eeprom_info;
	const struct iwl4965_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 iwl4965_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;
}

/**
 * iwl4965_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 iwl4965_hw_reg_send_txpower(struct iwl4965_priv *priv)
{
	struct iwl4965_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 = iwl4965_send_cmd_pdu(priv, REPLY_TX_PWR_TABLE_CMD, sizeof(cmd), &cmd);
	return rc;
}

int iwl4965_hw_channel_switch(struct iwl4965_priv *priv, u16 channel)
{
	int rc;
	u8 band = 0;
	u8 is_fat = 0;
	u8 ctrl_chan_high = 0;
	struct iwl4965_channel_switch_cmd cmd = { 0 };
	const struct iwl4965_channel_info *ch_info;

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

	ch_info = iwl4965_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 = iwl4965_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 iwl4965_hw_build_tx_cmd_rate(struct iwl4965_priv *priv,
			      struct iwl4965_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 = iwl4965_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 = iwl4965_hw_set_rate_n_flags(rate, 0);
	cmd->cmd.tx.tx_flags = tx_flags;
}

int iwl4965_hw_get_rx_read(struct iwl4965_priv *priv)
{
	struct iwl4965_shared *shared_data = priv->hw_setting.shared_virt;

	return IWL_GET_BITS(*shared_data, rb_closed_stts_rb_num);
}

int iwl4965_hw_get_temperature(struct iwl4965_priv *priv)
{
	return priv->temperature;
}

unsigned int iwl4965_hw_get_beacon_cmd(struct iwl4965_priv *priv,
			  struct iwl4965_frame *frame, u8 rate)
{
	struct iwl4965_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 = iwl4965_fill_beacon_frame(priv,
				tx_beacon_cmd->frame,
				iwl4965_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 =
			iwl4965_hw_set_rate_n_flags(rate, RATE_MCS_CCK_MSK);
	else
		tx_beacon_cmd->tx.rate_n_flags =
			iwl4965_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);
}

/*
 * Tell 4965 where to find circular buffer of Tx Frame Descriptors for
 * given Tx queue, and enable the DMA channel used for that queue.
 *
 * 4965 supports up to 16 Tx queues in DRAM, mapped to up to 8 Tx DMA
 * channels supported in hardware.
 */
int iwl4965_hw_tx_queue_init(struct iwl4965_priv *priv, struct iwl4965_tx_queue *txq)
{
	int rc;
	unsigned long flags;
	int txq_id = txq->q.id;

	spin_lock_irqsave(&priv->lock, flags);
	rc = iwl4965_grab_nic_access(priv);
	if (rc) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return rc;
	}

	/* Circular buffer (TFD queue in DRAM) physical base address */
	iwl4965_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id),
			     txq->q.dma_addr >> 8);

	/* Enable DMA channel, using same id as for TFD queue */
	iwl4965_write_direct32(
		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);
	iwl4965_release_nic_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 iwl4965_hw_txq_attach_buf_to_tfd(struct iwl4965_priv *priv, void *ptr,
				 dma_addr_t addr, u16 len)
{
	int index, is_odd;
	struct iwl4965_tfd_frame *tfd = ptr;
	u32 num_tbs = IWL_GET_BITS(*tfd, num_tbs);

	/* Each TFD can point to a maximum 20 Tx buffers */
	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;
}

static void iwl4965_hw_card_show_info(struct iwl4965_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

/**
 * iwl4965_tx_queue_update_wr_ptr - Set up entry in Tx byte-count array
 */
int iwl4965_tx_queue_update_wr_ptr(struct iwl4965_priv *priv,
				   struct iwl4965_tx_queue *txq, u16 byte_cnt)
{
	int len;
	int txq_id = txq->q.id;
	struct iwl4965_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;

	/* Set up byte count within first 256 entries */
	IWL_SET_BITS16(shared_data->queues_byte_cnt_tbls[txq_id].
		       tfd_offset[txq->q.write_ptr], byte_cnt, len);

	/* If within first 64 entries, duplicate at end */
	if (txq->q.write_ptr < IWL4965_MAX_WIN_SIZE)
		IWL_SET_BITS16(shared_data->queues_byte_cnt_tbls[txq_id].
			tfd_offset[IWL4965_QUEUE_SIZE + txq->q.write_ptr],
			byte_cnt, len);

	return 0;
}

/**
 * iwl4965_set_rxon_chain - Set up Rx chain usage in "staging" RXON image
 *
 * Selects how many and which Rx receivers/antennas/chains to use.
 * This should not be used for scan command ... it puts data in wrong place.
 */
void iwl4965_set_rxon_chain(struct iwl4965_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_IWL4965_HT
#ifdef CONFIG_IWL4965_HT_AGG
/*
	get the traffic load value for tid
*/
static u32 iwl4965_tl_get_load(struct iwl4965_priv *priv, u8 tid)
{
	u32 load = 0;
	u32 current_time = jiffies_to_msecs(jiffies);
	u32 time_diff;
	s32 index;
	unsigned long flags;
	struct iwl4965_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 iwl4965_priv *priv, u8 tid)
{
	u32 current_time = jiffies_to_msecs(jiffies);
	u32 time_diff;
	s32 index;
	unsigned long flags;
	struct iwl4965_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,
};

/**
 * iwl4964_tl_ba_avail - Find out if an unused aggregation queue is available
 */
static u8 iwl4964_tl_ba_avail(struct iwl4965_priv *priv)
{
	int i;
	struct iwl4965_lq_mngr *lq;
	u8 count = 0;
	u16 msk;

	lq = (struct iwl4965_lq_mngr *)&(priv->lq_mngr);

	/* Find out how many agg queues are in use */
	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 iwl4965_priv *priv,
			      u8 tid, enum HT_STATUS status);

static int iwl4965_perform_addba(struct iwl4965_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 iwl4965_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 iwl4965_priv *priv,
					struct iwl4965_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 iwl4965_priv *priv, u8 tid)
{
	struct iwl4965_lq_mngr *lq;
	unsigned long flags;

	lq = (struct iwl4965_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 iwl4965_priv *priv, u8 tid)
{
	u32 tid_msk;
	struct iwl4965_lq_mngr *lq;
	unsigned long flags;

	lq = (struct iwl4965_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);
	}
}

/**
 * iwl4965_ba_status - Update driver's link quality mgr with tid's HT status
 */
static void iwl4965_ba_status(struct iwl4965_priv *priv,
				u8 tid, enum HT_STATUS status)
{
	struct iwl4965_lq_mngr *lq;
	u32 tid_msk = (1 << tid);
	unsigned long flags;

	lq = (struct iwl4965_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 iwl4965_priv *priv = container_of(work, struct iwl4965_priv,
					agg_work);

	u32 tid;
	u32 retry_tid;
	u32 tid_msk;
	unsigned long flags;
	struct iwl4965_lq_mngr *lq = (struct iwl4965_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_IWL4965_HT_AGG */
#endif /* CONFIG_IWL4965_HT */

int iwl4965_tx_cmd(struct iwl4965_priv *priv, struct iwl4965_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 iwl4965_tx_cmd cmd;
	struct iwl4965_tx_cmd *tx = (struct iwl4965_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_IWL4965_HT
#ifdef CONFIG_IWL4965_HT_AGG
	__le16 *qc;
#endif /*CONFIG_IWL4965_HT_AGG */
#endif /* CONFIG_IWL4965_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 iwl4965_tx_cmd));
	memset(tx, 0, sizeof(struct iwl4965_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 iwl4965_cmd_header) +
	    offsetof(struct iwl4965_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 = iwl4965_hw_set_rate_n_flags(iwl4965_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_IWL4965_HT
#ifdef CONFIG_IWL4965_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 iwl4965_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
	 * "initialize" 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 iwl4965_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 iwl4965_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 iwl4965_hw_rx_statistics(struct iwl4965_priv *priv, struct iwl4965_rx_mem_buffer *rxb)
{
	struct iwl4965_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_IWL4965_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 iwl4965_priv *priv, int is_data,
				       int include_phy,
				       struct iwl4965_rx_mem_buffer *rxb,
				       struct ieee80211_rx_status *stats)
{
	struct iwl4965_rx_packet *pkt = (struct iwl4965_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 > IWL_RX_BUF_SIZE || len < 16) {
		IWL_WARNING("byte count out of range [16,4K]"
			       " : %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 (iwl4965_param_hwcrypto)
			iwl4965_set_decrypted_flag(priv, rxb->skb,
					       ampdu_status, stats);
		iwl4965_handle_data_packet_monitor(priv, rxb, hdr, len, stats, 0);
		return;
	}

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

	if (iwl4965_param_hwcrypto)
		iwl4965_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;
	iwl4965_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_IWL4965_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;
}

void iwl4965_init_ht_hw_capab(struct ieee80211_ht_info *ht_info, int mode)
{
	ht_info->cap = 0;
	memset(ht_info->supp_mcs_set, 0, 16);

	ht_info->ht_supported = 1;

	if (mode == MODE_IEEE80211A) {
		ht_info->cap |= (u16)IEEE80211_HT_CAP_SUP_WIDTH;
		ht_info->cap |= (u16)IEEE80211_HT_CAP_SGI_40;
		ht_info->supp_mcs_set[4] = 0x01;
	}
	ht_info->cap |= (u16)IEEE80211_HT_CAP_GRN_FLD;
	ht_info->cap |= (u16)IEEE80211_HT_CAP_SGI_20;
	ht_info->cap |= (u16)(IEEE80211_HT_CAP_MIMO_PS &
			     (IWL_MIMO_PS_NONE << 2));

	ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
	ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;

	ht_info->supp_mcs_set[0] = 0xFF;
	ht_info->supp_mcs_set[1] = 0xFF;
}
#endif /* CONFIG_IWL4965_HT */

static void iwl4965_sta_modify_ps_wake(struct iwl4965_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);

	iwl4965_send_add_station(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
}

static void iwl4965_update_ps_mode(struct iwl4965_priv *priv, u16 ps_bit, u8 *addr)
{
	/* FIXME: need locking over ps_status ??? */
	u8 sta_id = iwl4965_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;
		}
	}
}

#define IWL_DELAY_NEXT_SCAN_AFTER_ASSOC (HZ*6)

/* 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 iwl4965_priv *priv,
				struct iwl4965_rx_mem_buffer *rxb)
{
	struct iwl4965_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 = iwl4965_hw_get_rate(rx_start->rate_n_flags),
		.flag = 0,
#ifdef CONFIG_IWL4965_HT_AGG
		.ordered = 0
#endif /* CONFIG_IWL4965_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 (iwl4965_is_associated(priv) &&
	    !test_bit(STATUS_SCANNING, &priv->status)) {
		stats.noise = priv->last_rx_noise;
		stats.signal = iwl4965_calc_sig_qual(stats.ssi, stats.noise);
	} else {
		stats.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
		stats.signal = iwl4965_calc_sig_qual(stats.ssi, 0);
	}

	/* Reset beacon noise level if not associated. */
	if (!iwl4965_is_associated(priv))
		priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;

#ifdef CONFIG_IWL4965_DEBUG
	/* TODO:  Parts of iwl4965_report_frame are broken for 4965 */
	if (iwl4965_debug_level & (IWL_DL_RX))
		/* Set "1" to report good data frames in groups of 100 */
		iwl4965_report_frame(priv, pkt, header, 1);

	if (iwl4965_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 = iwl4965_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_IWL4965_HT
				u8 *pos = NULL;
				struct ieee802_11_elems elems;
#endif				/*CONFIG_IWL4965_HT */
				struct ieee80211_mgmt *mgnt =
					(struct ieee80211_mgmt *)header;

				/* We have just associated, give some
				 * time for the 4-way handshake if
				 * any. Don't start scan too early. */
				priv->next_scan_jiffies = jiffies +
					IWL_DELAY_NEXT_SCAN_AFTER_ASSOC;

				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_IWL4965_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_IWL4965_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) &&
			    !iwl4965_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_IWL4965_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(iwl4965_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 iwl4965_priv *priv,
				    struct iwl4965_rx_mem_buffer *rxb)
{
	struct iwl4965_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 iwl4965_priv *priv,
					   struct iwl4965_rx_mem_buffer *rxb)

{
#ifdef CONFIG_IWL4965_SENSITIVITY
	struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data;
	struct iwl4965_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_IWL4965_SENSITIVITY*/
}

#ifdef CONFIG_IWL4965_HT
#ifdef CONFIG_IWL4965_HT_AGG

/**
 * iwl4965_set_tx_status - Update driver's record of one Tx frame's status
 *
 * This will get sent to mac80211.
 */
static void iwl4965_set_tx_status(struct iwl4965_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;
}


/**
 * iwl4965_sta_modify_enable_tid_tx - Enable Tx for this TID in station table
 */
static void iwl4965_sta_modify_enable_tid_tx(struct iwl4965_priv *priv,
					 int sta_id, int tid)
{
	unsigned long flags;

	/* Remove "disable" flag, to enable Tx for this TID */
	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);

	iwl4965_send_add_station(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
}


/**
 * iwl4965_tx_status_reply_compressed_ba - Update tx status from block-ack
 *
 * Go through block-ack's bitmap of ACK'd frames, update driver's record of
 * ACK vs. not.  This gets sent to mac80211, then to rate scaling algo.
 */
static int iwl4965_tx_status_reply_compressed_ba(struct iwl4965_priv *priv,
						 struct iwl4965_ht_agg *agg,
						 struct iwl4965_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;
	}

	/* Mark that the expected block-ack response arrived */
	agg->wait_for_ba = 0;
	IWL_DEBUG_TX_REPLY("BA %d %d\n", agg->start_idx, ba_resp->ba_seq_ctl);

	/* Calculate shift to align block-ack bits with our Tx window bits */
	sh = agg->start_idx - SEQ_TO_INDEX(ba_seq_ctl>>4);
	if (sh < 0) /* tbw something is wrong with indices */
		sh += 0x100;

	/* don't use 64-bit values 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 block-ack bitmap */
	bitmap0 &= agg->bitmap0;
	bitmap1 &= agg->bitmap1;

	/* For each frame attempted in aggregation,
	 * update driver's record of tx frame's status. */
	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;
}

/**
 * iwl4965_queue_dec_wrap - Decrement queue index, wrap back to end if needed
 * @index -- current index
 * @n_bd -- total number of entries in queue (s/b power of 2)
 */
static inline int iwl4965_queue_dec_wrap(int index, int n_bd)
{
	return (index == 0) ? n_bd - 1 : index - 1;
}

/**
 * iwl4965_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
 *
 * Handles block-acknowledge notification from device, which reports success
 * of frames sent via aggregation.
 */
static void iwl4965_rx_reply_compressed_ba(struct iwl4965_priv *priv,
					   struct iwl4965_rx_mem_buffer *rxb)
{
	struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data;
	struct iwl4965_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
	int index;
	struct iwl4965_tx_queue *txq = NULL;
	struct iwl4965_ht_agg *agg;

	/* "flow" corresponds to Tx queue */
	u16 ba_resp_scd_flow = le16_to_cpu(ba_resp->scd_flow);

	/* "ssn" is start of block-ack Tx window, corresponds to index
	 * (in Tx queue's circular buffer) of first TFD/frame in window */
	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;

	/* Find index just before block-ack window */
	index = iwl4965_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd);

	/* TODO: Need to get this copy more safely - 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);
	}
*/

	/* Update driver's record of ACK vs. not for each frame in window */
	iwl4965_tx_status_reply_compressed_ba(priv, agg, ba_resp);

	/* Release all TFDs before the SSN, i.e. all TFDs in front of
	 * block-ack window (we assume that they've been successfully
	 * transmitted ... if not, it's too late anyway). */
	if (txq->q.read_ptr != (ba_resp_scd_ssn & 0xff))
		iwl4965_tx_queue_reclaim(priv, ba_resp_scd_flow, index);

}


/**
 * iwl4965_tx_queue_stop_scheduler - Stop queue, but keep configuration
 */
static void iwl4965_tx_queue_stop_scheduler(struct iwl4965_priv *priv, u16 txq_id)
{
	/* Simply stop the queue, but don't change any configuration;
	 * the SCD_ACT_EN bit is the write-enable mask for the ACTIVE bit. */
	iwl4965_write_prph(priv,
		KDR_SCD_QUEUE_STATUS_BITS(txq_id),
		(0 << SCD_QUEUE_STTS_REG_POS_ACTIVE)|
		(1 << SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN));
}

/**
 * iwl4965_tx_queue_set_q2ratid - Map unique receiver/tid combination to a queue
 */
static int iwl4965_tx_queue_set_q2ratid(struct iwl4965_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 = iwl4965_read_targ_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);

	iwl4965_write_targ_mem(priv, tbl_dw_addr, tbl_dw);

	return 0;
}

/**
 * iwl4965_tx_queue_agg_enable - Set up & enable aggregation for selected queue
 *
 * NOTE:  txq_id must be greater than IWL_BACK_QUEUE_FIRST_ID,
 *        i.e. it must be one of the higher queues used for aggregation
 */
static int iwl4965_tx_queue_agg_enable(struct iwl4965_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);

	/* Modify device's station table to Tx this TID */
	iwl4965_sta_modify_enable_tid_tx(priv, sta_id, tid);

	spin_lock_irqsave(&priv->lock, flags);
	rc = iwl4965_grab_nic_access(priv);
	if (rc) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return rc;
	}

	/* Stop this Tx queue before configuring it */
	iwl4965_tx_queue_stop_scheduler(priv, txq_id);

	/* Map receiver-address / traffic-ID to this queue */
	iwl4965_tx_queue_set_q2ratid(priv, ra_tid, txq_id);

	/* Set this queue as a chain-building queue */
	iwl4965_set_bits_prph(priv, KDR_SCD_QUEUECHAIN_SEL, (1<<txq_id));

	/* Place first TFD at index corresponding to start sequence number.
	 * Assumes that ssn_idx is valid (!= 0xFFF) */
	priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
	priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
	iwl4965_set_wr_ptrs(priv, txq_id, ssn_idx);

	/* Set up Tx window size and frame limit for this queue */
	iwl4965_write_targ_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);

	iwl4965_write_targ_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);

	iwl4965_set_bits_prph(priv, KDR_SCD_INTERRUPT_MASK, (1 << txq_id));

	/* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */
	iwl4965_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 1);

	iwl4965_release_nic_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 iwl4965_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 = iwl4965_grab_nic_access(priv);
	if (rc) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return rc;
	}

	iwl4965_tx_queue_stop_scheduler(priv, txq_id);

	iwl4965_clear_bits_prph(priv, KDR_SCD_QUEUECHAIN_SEL, (1 << txq_id));

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

	iwl4965_clear_bits_prph(priv, KDR_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);

	iwl4965_release_nic_access(priv);
	spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

#endif/* CONFIG_IWL4965_HT_AGG */
#endif /* CONFIG_IWL4965_HT */

/**
 * iwl4965_add_station - Initialize a station's hardware rate table
 *
 * The uCode's station table contains a table of fallback rates
 * for automatic fallback during transmission.
 *
 * NOTE: This sets up a default set of values.  These will be replaced later
 *       if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
 *       rc80211_simple.
 *
 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
 *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
 *       which requires station table entry to exist).
 */
void iwl4965_add_station(struct iwl4965_priv *priv, const u8 *addr, int is_ap)
{
	int i, r;
	struct iwl4965_link_quality_cmd link_cmd = {
		.reserved1 = 0,
	};
	u16 rate_flags;

	/* Set up the rate scaling to start at selected rate, fall back
	 * all the way down to 1M in IEEE order, and then spin on 1M */
	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;

		/* Use Tx antenna B only */
		rate_flags |= RATE_MCS_ANT_B_MSK;
		rate_flags &= ~RATE_MCS_ANT_A_MSK;

		link_cmd.rs_table[i].rate_n_flags =
			iwl4965_hw_set_rate_n_flags(iwl4965_rates[r].plcp, rate_flags);
		r = iwl4965_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;

	iwl4965_send_cmd_pdu(priv, REPLY_TX_LINK_QUALITY_CMD, sizeof(link_cmd),
			 &link_cmd);
}

#ifdef CONFIG_IWL4965_HT

static u8 iwl4965_is_channel_extension(struct iwl4965_priv *priv, int phymode,
				   u16 channel, u8 extension_chan_offset)
{
	const struct iwl4965_channel_info *ch_info;

	ch_info = iwl4965_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 iwl4965_is_fat_tx_allowed(struct iwl4965_priv *priv,
				struct ieee80211_ht_info *sta_ht_inf)
{
	struct iwl_ht_info *iwl_ht_conf = &priv->current_ht_config;

	if ((!iwl_ht_conf->is_ht) ||
	   (iwl_ht_conf->supported_chan_width != IWL_CHANNEL_WIDTH_40MHZ) ||
	   (iwl_ht_conf->extension_chan_offset == IWL_EXT_CHANNEL_OFFSET_AUTO))
		return 0;

	if (sta_ht_inf) {
		if ((!sta_ht_inf->ht_supported) ||
		   (!sta_ht_inf->cap & IEEE80211_HT_CAP_SUP_WIDTH))
			return 0;
	}

	return (iwl4965_is_channel_extension(priv, priv->phymode,
					 iwl_ht_conf->control_channel,
					 iwl_ht_conf->extension_chan_offset));
}

void iwl4965_set_rxon_ht(struct iwl4965_priv *priv, struct iwl_ht_info *ht_info)
{
	struct iwl4965_rxon_cmd *rxon = &priv->staging_rxon;
	u32 val;

	if (!ht_info->is_ht)
		return;

	/* Set up channel bandwidth:  20 MHz only, or 20/40 mixed if fat ok */
	if (iwl4965_is_fat_tx_allowed(priv, NULL))
		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 opposite of 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->ht_protection;

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

	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",
			ht_info->supp_mcs_set[0], ht_info->supp_mcs_set[1],
			le32_to_cpu(rxon->flags), ht_info->ht_protection,
			ht_info->extension_chan_offset,
			ht_info->control_channel);
	return;
}

void iwl4965_set_ht_add_station(struct iwl4965_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 (iwl4965_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_IWL4965_HT_AGG

static void iwl4965_sta_modify_add_ba_tid(struct iwl4965_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);

	iwl4965_send_add_station(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
}

static void iwl4965_sta_modify_del_ba_tid(struct iwl4965_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);

	iwl4965_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
};

/*
 * Find first available (lowest unused) Tx Queue, mark it "active".
 * Called only when finding queue for aggregation.
 * Should never return anything < 7, because they should already
 * be in use as EDCA AC (0-3), Command (4), HCCA (5, 6).
 */
static int iwl4965_txq_ctx_activate_free(struct iwl4965_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 iwl4965_mac_ht_tx_agg_start(struct ieee80211_hw *hw, u8 *da, u16 tid,
			    u16 *start_seq_num)
{

	struct iwl4965_priv *priv = hw->priv;
	int sta_id;
	int tx_fifo;
	int txq_id;
	int ssn = -1;
	unsigned long flags;
	struct iwl4965_tid_data *tid_data;
	DECLARE_MAC_BUF(mac);

	/* Determine Tx DMA/FIFO channel for this Traffic ID */
	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 iwl4965_mac_ht_tx_agg_start on da=%s"
		    " tid=%d\n", print_mac(mac, da), tid);

	/* Get index into station table */
	sta_id = iwl4965_hw_find_station(priv, da);
	if (sta_id == IWL_INVALID_STATION)
		return -ENXIO;

	/* Find available Tx queue for aggregation */
	txq_id = iwl4965_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];

	/* Get starting sequence number for 1st frame in block ack window.
	 * We'll use least signif byte as 1st frame's index into Tx queue. */
	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;

	/* Update driver's link quality manager */
	iwl4965_ba_status(priv, tid, BA_STATUS_ACTIVE);

	/* Set up and enable aggregation for selected Tx queue and FIFO */
	return iwl4965_tx_queue_agg_enable(priv, txq_id, tx_fifo,
					   sta_id, tid, ssn);
}


int iwl4965_mac_ht_tx_agg_stop(struct ieee80211_hw *hw, u8 *da, u16 tid,
			   int generator)
{

	struct iwl4965_priv *priv = hw->priv;
	int tx_fifo_id, txq_id, sta_id, ssn = -1;
	struct iwl4965_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 = iwl4965_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("iwl4965_mac_ht_tx_agg_stop on da=%s tid=%d\n",
		       print_mac(mac, da), tid);

	return 0;
}

int iwl4965_mac_ht_rx_agg_start(struct ieee80211_hw *hw, u8 *da,
			    u16 tid, u16 start_seq_num)
{
	struct iwl4965_priv *priv = hw->priv;
	int sta_id;
	DECLARE_MAC_BUF(mac);

	IWL_WARNING("iwl-AGG iwl4965_mac_ht_rx_agg_start on da=%s"
		    " tid=%d\n", print_mac(mac, da), tid);
	sta_id = iwl4965_hw_find_station(priv, da);
	iwl4965_sta_modify_add_ba_tid(priv, sta_id, tid, start_seq_num);
	return 0;
}

int iwl4965_mac_ht_rx_agg_stop(struct ieee80211_hw *hw, u8 *da,
			   u16 tid, int generator)
{
	struct iwl4965_priv *priv = hw->priv;
	int sta_id;
	DECLARE_MAC_BUF(mac);

	IWL_WARNING("iwl-AGG iwl4965_mac_ht_rx_agg_stop on da=%s tid=%d\n",
		    print_mac(mac, da), tid);
	sta_id = iwl4965_hw_find_station(priv, da);
	iwl4965_sta_modify_del_ba_tid(priv, sta_id, tid);
	return 0;
}

#endif /* CONFIG_IWL4965_HT_AGG */
#endif /* CONFIG_IWL4965_HT */

/* Set up 4965-specific Rx frame reply handlers */
void iwl4965_hw_rx_handler_setup(struct iwl4965_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_IWL4965_HT
#ifdef CONFIG_IWL4965_HT_AGG
	priv->rx_handlers[REPLY_COMPRESSED_BA] = iwl4965_rx_reply_compressed_ba;
#endif /* CONFIG_IWL4965_HT_AGG */
#endif /* CONFIG_IWL4965_HT */
}

void iwl4965_hw_setup_deferred_work(struct iwl4965_priv *priv)
{
	INIT_WORK(&priv->txpower_work, iwl4965_bg_txpower_work);
	INIT_WORK(&priv->statistics_work, iwl4965_bg_statistics_work);
#ifdef CONFIG_IWL4965_SENSITIVITY
	INIT_WORK(&priv->sensitivity_work, iwl4965_bg_sensitivity_work);
#endif
#ifdef CONFIG_IWL4965_HT
#ifdef CONFIG_IWL4965_HT_AGG
	INIT_WORK(&priv->agg_work, iwl4965_bg_agg_work);
#endif /* CONFIG_IWL4965_HT_AGG */
#endif /* CONFIG_IWL4965_HT */
	init_timer(&priv->statistics_periodic);
	priv->statistics_periodic.data = (unsigned long)priv;
	priv->statistics_periodic.function = iwl4965_bg_statistics_periodic;
}

void iwl4965_hw_cancel_deferred_work(struct iwl4965_priv *priv)
{
	del_timer_sync(&priv->statistics_periodic);

	cancel_delayed_work(&priv->init_alive_start);
}

struct pci_device_id iwl4965_hw_card_ids[] = {
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x4229)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x4230)},
	{0}
};

/*
 * The device's EEPROM semaphore prevents conflicts between driver and uCode
 * when accessing the EEPROM; each access is a series of pulses to/from the
 * EEPROM chip, not a single event, so even reads could conflict if they
 * weren't arbitrated by the semaphore.
 */
int iwl4965_eeprom_acquire_semaphore(struct iwl4965_priv *priv)
{
	u16 count;
	int rc;

	for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
		/* Request semaphore */
		iwl4965_set_bit(priv, CSR_HW_IF_CONFIG_REG,
			CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);

		/* See if we got it */
		rc = iwl4965_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("Acquired semaphore after %d tries.\n",
				count+1);
			return rc;
		}
	}

	return rc;
}

inline void iwl4965_eeprom_release_semaphore(struct iwl4965_priv *priv)
{
	iwl4965_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
		CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
}


MODULE_DEVICE_TABLE(pci, iwl4965_hw_card_ids);