/******************************************************************************
 *
 * Copyright(c) 2003 - 2009 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:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/wireless.h>
#include <net/mac80211.h>
#include <linux/etherdevice.h>
#include <asm/unaligned.h>

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

static int iwl4965_send_tx_power(struct iwl_priv *priv);
static int iwl4965_hw_get_temperature(struct iwl_priv *priv);

/* Highest firmware API version supported */
#define IWL4965_UCODE_API_MAX 2

/* Lowest firmware API version supported */
#define IWL4965_UCODE_API_MIN 2

#define IWL4965_FW_PRE "iwlwifi-4965-"
#define _IWL4965_MODULE_FIRMWARE(api) IWL4965_FW_PRE #api ".ucode"
#define IWL4965_MODULE_FIRMWARE(api) _IWL4965_MODULE_FIRMWARE(api)


/* module parameters */
static struct iwl_mod_params iwl4965_mod_params = {
        .num_of_queues = IWL49_NUM_QUEUES,
        .num_of_ampdu_queues = IWL49_NUM_AMPDU_QUEUES,
        .amsdu_size_8K = 1,
        .restart_fw = 1,
        /* the rest are 0 by default */
};

/* check contents of special bootstrap uCode SRAM */
static int iwl4965_verify_bsm(struct iwl_priv *priv)
{
        __le32 *image = priv->ucode_boot.v_addr;
        u32 len = priv->ucode_boot.len;
        u32 reg;
        u32 val;

        IWL_DEBUG_INFO(priv, "Begin verify bsm\n");

        /* verify BSM SRAM contents */
        val = iwl_read_prph(priv, BSM_WR_DWCOUNT_REG);
        for (reg = BSM_SRAM_LOWER_BOUND;
             reg < BSM_SRAM_LOWER_BOUND + len;
             reg += sizeof(u32), image++) {
                val = iwl_read_prph(priv, reg);
                if (val != le32_to_cpu(*image)) {
                        IWL_ERR(priv, "BSM uCode verification failed at "
                                  "addr 0x%08X+%u (of %u), is 0x%x, s/b 0x%x\n",
                                  BSM_SRAM_LOWER_BOUND,
                                  reg - BSM_SRAM_LOWER_BOUND, len,
                                  val, le32_to_cpu(*image));
                        return -EIO;
                }
        }

        IWL_DEBUG_INFO(priv, "BSM bootstrap uCode image OK\n");

        return 0;
}

/**
 * iwl4965_load_bsm - Load bootstrap instructions
 *
 * BSM operation:
 *
 * The Bootstrap State Machine (BSM) stores a short bootstrap uCode program
 * in special SRAM that does not power down during RFKILL.  When powering back
 * up after power-saving sleeps (or during initial uCode load), the BSM loads
 * the bootstrap program into the on-board processor, and starts it.
 *
 * The bootstrap program loads (via DMA) instructions and data for a new
 * program from host DRAM locations indicated by the host driver in the
 * BSM_DRAM_* registers.  Once the new program is loaded, it starts
 * automatically.
 *
 * When initializing the NIC, the host driver points the BSM to the
 * "initialize" uCode image.  This uCode sets up some internal data, then
 * notifies host via "initialize alive" that it is complete.
 *
 * The host then replaces the BSM_DRAM_* pointer values to point to the
 * normal runtime uCode instructions and a backup uCode data cache buffer
 * (filled initially with starting data values for the on-board processor),
 * then triggers the "initialize" uCode to load and launch the runtime uCode,
 * which begins normal operation.
 *
 * When doing a power-save shutdown, runtime uCode saves data SRAM into
 * the backup data cache in DRAM before SRAM is powered down.
 *
 * When powering back up, the BSM loads the bootstrap program.  This reloads
 * the runtime uCode instructions and the backup data cache into SRAM,
 * and re-launches the runtime uCode from where it left off.
 */
static int iwl4965_load_bsm(struct iwl_priv *priv)
{
        __le32 *image = priv->ucode_boot.v_addr;
        u32 len = priv->ucode_boot.len;
        dma_addr_t pinst;
        dma_addr_t pdata;
        u32 inst_len;
        u32 data_len;
        int i;
        u32 done;
        u32 reg_offset;
        int ret;

        IWL_DEBUG_INFO(priv, "Begin load bsm\n");

        priv->ucode_type = UCODE_RT;

        /* make sure bootstrap program is no larger than BSM's SRAM size */
        if (len > IWL49_MAX_BSM_SIZE)
                return -EINVAL;

        /* Tell bootstrap uCode where to find the "Initialize" uCode
         *   in host DRAM ... host DRAM physical address bits 35:4 for 4965.
         * NOTE:  iwl_init_alive_start() will replace these values,
         *        after the "initialize" uCode has run, to point to
         *        runtime/protocol instructions and backup data cache.
         */
        pinst = priv->ucode_init.p_addr >> 4;
        pdata = priv->ucode_init_data.p_addr >> 4;
        inst_len = priv->ucode_init.len;
        data_len = priv->ucode_init_data.len;

        iwl_write_prph(priv, BSM_DRAM_INST_PTR_REG, pinst);
        iwl_write_prph(priv, BSM_DRAM_DATA_PTR_REG, pdata);
        iwl_write_prph(priv, BSM_DRAM_INST_BYTECOUNT_REG, inst_len);
        iwl_write_prph(priv, BSM_DRAM_DATA_BYTECOUNT_REG, data_len);

        /* Fill BSM memory with bootstrap instructions */
        for (reg_offset = BSM_SRAM_LOWER_BOUND;
             reg_offset < BSM_SRAM_LOWER_BOUND + len;
             reg_offset += sizeof(u32), image++)
                _iwl_write_prph(priv, reg_offset, le32_to_cpu(*image));

        ret = iwl4965_verify_bsm(priv);
        if (ret)
                return ret;

        /* Tell BSM to copy from BSM SRAM into instruction SRAM, when asked */
        iwl_write_prph(priv, BSM_WR_MEM_SRC_REG, 0x0);
        iwl_write_prph(priv, BSM_WR_MEM_DST_REG, IWL49_RTC_INST_LOWER_BOUND);
        iwl_write_prph(priv, BSM_WR_DWCOUNT_REG, len / sizeof(u32));

        /* Load bootstrap code into instruction SRAM now,
         *   to prepare to load "initialize" uCode */
        iwl_write_prph(priv, BSM_WR_CTRL_REG, BSM_WR_CTRL_REG_BIT_START);

        /* Wait for load of bootstrap uCode to finish */
        for (i = 0; i < 100; i++) {
                done = iwl_read_prph(priv, BSM_WR_CTRL_REG);
                if (!(done & BSM_WR_CTRL_REG_BIT_START))
                        break;
                udelay(10);
        }
        if (i < 100)
                IWL_DEBUG_INFO(priv, "BSM write complete, poll %d iterations\n", i);
        else {
                IWL_ERR(priv, "BSM write did not complete!\n");
                return -EIO;
        }

        /* Enable future boot loads whenever power management unit triggers it
         *   (e.g. when powering back up after power-save shutdown) */
        iwl_write_prph(priv, BSM_WR_CTRL_REG, BSM_WR_CTRL_REG_BIT_START_EN);


        return 0;
}

/**
 * iwl4965_set_ucode_ptrs - Set uCode address location
 *
 * Tell initialization uCode where to find runtime uCode.
 *
 * BSM registers initially contain pointers to initialization uCode.
 * We need to replace them to load runtime uCode inst and data,
 * and to save runtime data when powering down.
 */
static int iwl4965_set_ucode_ptrs(struct iwl_priv *priv)
{
        dma_addr_t pinst;
        dma_addr_t pdata;
        int ret = 0;

        /* bits 35:4 for 4965 */
        pinst = priv->ucode_code.p_addr >> 4;
        pdata = priv->ucode_data_backup.p_addr >> 4;

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

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

        return ret;
}

/**
 * iwl4965_init_alive_start - Called after REPLY_ALIVE notification received
 *
 * Called after REPLY_ALIVE notification received from "initialize" uCode.
 *
 * The 4965 "initialize" ALIVE reply contains calibration data for:
 *   Voltage, temperature, and MIMO tx gain correction, now stored in priv
 *   (3945 does not contain this data).
 *
 * Tell "initialize" uCode to go ahead and load the runtime uCode.
*/
static void iwl4965_init_alive_start(struct iwl_priv *priv)
{
        /* Check alive response for "valid" sign from uCode */
        if (priv->card_alive_init.is_valid != UCODE_VALID_OK) {
                /* We had an error bringing up the hardware, so take it
                 * all the way back down so we can try again */
                IWL_DEBUG_INFO(priv, "Initialize Alive failed.\n");
                goto restart;
        }

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

        /* Calculate temperature */
        priv->temperature = iwl4965_hw_get_temperature(priv);

        /* Send pointers to protocol/runtime uCode image ... init code will
         * load and launch runtime uCode, which will send us another "Alive"
         * notification. */
        IWL_DEBUG_INFO(priv, "Initialization Alive received.\n");
        if (iwl4965_set_ucode_ptrs(priv)) {
                /* Runtime instruction load won't happen;
                 * take it all the way back down so we can try again */
                IWL_DEBUG_INFO(priv, "Couldn't set up uCode pointers.\n");
                goto restart;
        }
        return;

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

static bool is_ht40_channel(__le32 rxon_flags)
{
        int chan_mod = le32_to_cpu(rxon_flags & RXON_FLG_CHANNEL_MODE_MSK)
                                    >> RXON_FLG_CHANNEL_MODE_POS;
        return ((chan_mod == CHANNEL_MODE_PURE_40) ||
                  (chan_mod == CHANNEL_MODE_MIXED));
}

/*
 * EEPROM handlers
 */
static u16 iwl4965_eeprom_calib_version(struct iwl_priv *priv)
{
        return iwl_eeprom_query16(priv, EEPROM_4965_CALIB_VERSION_OFFSET);
}

/*
 * Activate/Deactivate Tx DMA/FIFO channels according tx fifos mask
 * must be called under priv->lock and mac access
 */
static void iwl4965_txq_set_sched(struct iwl_priv *priv, u32 mask)
{
        iwl_write_prph(priv, IWL49_SCD_TXFACT, mask);
}

static int iwl4965_apm_init(struct iwl_priv *priv)
{
        int ret = 0;

        iwl_set_bit(priv, CSR_GIO_CHICKEN_BITS,
                          CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);

        /* disable L0s without affecting L1 :don't wait for ICH L0s bug W/A) */
        iwl_set_bit(priv, CSR_GIO_CHICKEN_BITS,
                          CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);

        /* set "initialization complete" bit to move adapter
         * D0U* --> D0A* state */
        iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);

        /* wait for clock stabilization */
        ret = iwl_poll_direct_bit(priv, CSR_GP_CNTRL,
                        CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
        if (ret < 0) {
                IWL_DEBUG_INFO(priv, "Failed to init the card\n");
                goto out;
        }

        /* enable DMA */
        iwl_write_prph(priv, APMG_CLK_CTRL_REG, APMG_CLK_VAL_DMA_CLK_RQT |
                                                APMG_CLK_VAL_BSM_CLK_RQT);

        udelay(20);

        /* disable L1-Active */
        iwl_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
                          APMG_PCIDEV_STT_VAL_L1_ACT_DIS);

out:
        return ret;
}


static void iwl4965_nic_config(struct iwl_priv *priv)
{
        unsigned long flags;
        u16 radio_cfg;
        u16 lctl;

        spin_lock_irqsave(&priv->lock, flags);

        lctl = iwl_pcie_link_ctl(priv);

        /* HW bug W/A - negligible power consumption */
        /* L1-ASPM is enabled by BIOS */
        if ((lctl & PCI_CFG_LINK_CTRL_VAL_L1_EN) == PCI_CFG_LINK_CTRL_VAL_L1_EN)
                /* L1-ASPM enabled: disable L0S  */
                iwl_set_bit(priv, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED);
        else
                /* L1-ASPM disabled: enable L0S */
                iwl_clear_bit(priv, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED);

        radio_cfg = iwl_eeprom_query16(priv, EEPROM_RADIO_CONFIG);

        /* write radio config values to register */
        if (EEPROM_RF_CFG_TYPE_MSK(radio_cfg) == EEPROM_4965_RF_CFG_TYPE_MAX)
                iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
                            EEPROM_RF_CFG_TYPE_MSK(radio_cfg) |
                            EEPROM_RF_CFG_STEP_MSK(radio_cfg) |
                            EEPROM_RF_CFG_DASH_MSK(radio_cfg));

        /* set CSR_HW_CONFIG_REG for uCode use */
        iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
                    CSR_HW_IF_CONFIG_REG_BIT_RADIO_SI |
                    CSR_HW_IF_CONFIG_REG_BIT_MAC_SI);

        priv->calib_info = (struct iwl_eeprom_calib_info *)
                iwl_eeprom_query_addr(priv, EEPROM_4965_CALIB_TXPOWER_OFFSET);

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

static int iwl4965_apm_stop_master(struct iwl_priv *priv)
{
        unsigned long flags;

        spin_lock_irqsave(&priv->lock, flags);

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

        iwl_poll_direct_bit(priv, CSR_RESET,
                        CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);

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

        return 0;
}

static void iwl4965_apm_stop(struct iwl_priv *priv)
{
        unsigned long flags;

        iwl4965_apm_stop_master(priv);

        spin_lock_irqsave(&priv->lock, flags);

        iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);

        udelay(10);
        /* clear "init complete"  move adapter D0A* --> D0U state */
        iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
        spin_unlock_irqrestore(&priv->lock, flags);
}

static int iwl4965_apm_reset(struct iwl_priv *priv)
{
        int ret = 0;

        iwl4965_apm_stop_master(priv);


        iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);

        udelay(10);

        /* FIXME: put here L1A -L0S w/a */

        iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);

        ret = iwl_poll_direct_bit(priv, CSR_GP_CNTRL,
                        CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
        if (ret < 0)
                goto out;

        udelay(10);

        /* Enable DMA and BSM Clock */
        iwl_write_prph(priv, APMG_CLK_EN_REG, APMG_CLK_VAL_DMA_CLK_RQT |
                                              APMG_CLK_VAL_BSM_CLK_RQT);

        udelay(10);

        /* disable L1A */
        iwl_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
                          APMG_PCIDEV_STT_VAL_L1_ACT_DIS);

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

out:
        return ret;
}

/* 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.  */
static void iwl4965_chain_noise_reset(struct iwl_priv *priv)
{
        struct iwl_chain_noise_data *data = &(priv->chain_noise_data);

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

                memset(&cmd, 0, sizeof(cmd));
                cmd.hdr.op_code = IWL_PHY_CALIBRATE_DIFF_GAIN_CMD;
                cmd.diff_gain_a = 0;
                cmd.diff_gain_b = 0;
                cmd.diff_gain_c = 0;
                if (iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
                                 sizeof(cmd), &cmd))
                        IWL_ERR(priv,
                                "Could not send REPLY_PHY_CALIBRATION_CMD\n");
                data->state = IWL_CHAIN_NOISE_ACCUMULATE;
                IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
        }
}

static void iwl4965_gain_computation(struct iwl_priv *priv,
                u32 *average_noise,
                u16 min_average_noise_antenna_i,
                u32 min_average_noise)
{
        int i, ret;
        struct iwl_chain_noise_data *data = &priv->chain_noise_data;

        data->delta_gain_code[min_average_noise_antenna_i] = 0;

        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);
                        data->delta_gain_code[i] =
                                min(data->delta_gain_code[i],
                                (u8) 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(priv, "delta_gain_codes: a %d b %d c %d\n",
                     data->delta_gain_code[0],
                     data->delta_gain_code[1],
                     data->delta_gain_code[2]);

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

                memset(&cmd, 0, sizeof(cmd));
                cmd.hdr.op_code = IWL_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];
                ret = iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
                                      sizeof(cmd), &cmd);
                if (ret)
                        IWL_DEBUG_CALIB(priv, "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;
}

static void iwl4965_rts_tx_cmd_flag(struct ieee80211_tx_info *info,
                        __le32 *tx_flags)
{
        if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) {
                *tx_flags |= TX_CMD_FLG_RTS_MSK;
                *tx_flags &= ~TX_CMD_FLG_CTS_MSK;
        } else if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
                *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
                *tx_flags |= TX_CMD_FLG_CTS_MSK;
        }
}

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

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

        mutex_lock(&priv->mutex);

        /* Regardless of if we are associated, we must reconfigure the
         * TX power since frames can be sent on non-radar channels while
         * not associated */
        iwl4965_send_tx_power(priv);

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

        mutex_unlock(&priv->mutex);
}

/*
 * Acquire priv->lock before calling this function !
 */
static void iwl4965_set_wr_ptrs(struct iwl_priv *priv, int txq_id, u32 index)
{
        iwl_write_direct32(priv, HBUS_TARG_WRPTR,
                             (index & 0xff) | (txq_id << 8));
        iwl_write_prph(priv, IWL49_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 iwl_priv *priv,
                                        struct iwl_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 */
        iwl_write_prph(priv, IWL49_SCD_QUEUE_STATUS_BITS(txq_id),
                         (active << IWL49_SCD_QUEUE_STTS_REG_POS_ACTIVE) |
                         (tx_fifo_id << IWL49_SCD_QUEUE_STTS_REG_POS_TXF) |
                         (scd_retry << IWL49_SCD_QUEUE_STTS_REG_POS_WSL) |
                         (scd_retry << IWL49_SCD_QUEUE_STTS_REG_POS_SCD_ACK) |
                         IWL49_SCD_QUEUE_STTS_REG_MSK);

        txq->sched_retry = scd_retry;

        IWL_DEBUG_INFO(priv, "%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,
        IWL49_CMD_FIFO_NUM,
        IWL_TX_FIFO_HCCA_1,
        IWL_TX_FIFO_HCCA_2
};

static int iwl4965_alive_notify(struct iwl_priv *priv)
{
        u32 a;
        unsigned long flags;
        int i, chan;
        u32 reg_val;

        spin_lock_irqsave(&priv->lock, flags);

        /* Clear 4965's internal Tx Scheduler data base */
        priv->scd_base_addr = iwl_read_prph(priv, IWL49_SCD_SRAM_BASE_ADDR);
        a = priv->scd_base_addr + IWL49_SCD_CONTEXT_DATA_OFFSET;
        for (; a < priv->scd_base_addr + IWL49_SCD_TX_STTS_BITMAP_OFFSET; a += 4)
                iwl_write_targ_mem(priv, a, 0);
        for (; a < priv->scd_base_addr + IWL49_SCD_TRANSLATE_TBL_OFFSET; a += 4)
                iwl_write_targ_mem(priv, a, 0);
        for (; a < sizeof(u16) * priv->hw_params.max_txq_num; a += 4)
                iwl_write_targ_mem(priv, a, 0);

        /* Tel 4965 where to find Tx byte count tables */
        iwl_write_prph(priv, IWL49_SCD_DRAM_BASE_ADDR,
                        priv->scd_bc_tbls.dma >> 10);

        /* Enable DMA channel */
        for (chan = 0; chan < FH49_TCSR_CHNL_NUM ; chan++)
                iwl_write_direct32(priv, FH_TCSR_CHNL_TX_CONFIG_REG(chan),
                                FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
                                FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE);

        /* Update FH chicken bits */
        reg_val = iwl_read_direct32(priv, FH_TX_CHICKEN_BITS_REG);
        iwl_write_direct32(priv, FH_TX_CHICKEN_BITS_REG,
                           reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN);

        /* Disable chain mode for all queues */
        iwl_write_prph(priv, IWL49_SCD_QUEUECHAIN_SEL, 0);

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

                /* TFD circular buffer read/write indexes */
                iwl_write_prph(priv, IWL49_SCD_QUEUE_RDPTR(i), 0);
                iwl_write_direct32(priv, HBUS_TARG_WRPTR, 0 | (i << 8));

                /* Max Tx Window size for Scheduler-ACK mode */
                iwl_write_targ_mem(priv, priv->scd_base_addr +
                                IWL49_SCD_CONTEXT_QUEUE_OFFSET(i),
                                (SCD_WIN_SIZE <<
                                IWL49_SCD_QUEUE_CTX_REG1_WIN_SIZE_POS) &
                                IWL49_SCD_QUEUE_CTX_REG1_WIN_SIZE_MSK);

                /* Frame limit */
                iwl_write_targ_mem(priv, priv->scd_base_addr +
                                IWL49_SCD_CONTEXT_QUEUE_OFFSET(i) +
                                sizeof(u32),
                                (SCD_FRAME_LIMIT <<
                                IWL49_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
                                IWL49_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK);

        }
        iwl_write_prph(priv, IWL49_SCD_INTERRUPT_MASK,
                                 (1 << priv->hw_params.max_txq_num) - 1);

        /* Activate all Tx DMA/FIFO channels */
        priv->cfg->ops->lib->txq_set_sched(priv, IWL_MASK(0, 6));

        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];
                iwl_txq_ctx_activate(priv, i);
                iwl4965_tx_queue_set_status(priv, &priv->txq[i], ac, 0);
        }

        spin_unlock_irqrestore(&priv->lock, flags);

        return 0;
}

static struct iwl_sensitivity_ranges iwl4965_sensitivity = {
        .min_nrg_cck = 97,
        .max_nrg_cck = 0, /* not used, set to 0 */

        .auto_corr_min_ofdm = 85,
        .auto_corr_min_ofdm_mrc = 170,
        .auto_corr_min_ofdm_x1 = 105,
        .auto_corr_min_ofdm_mrc_x1 = 220,

        .auto_corr_max_ofdm = 120,
        .auto_corr_max_ofdm_mrc = 210,
        .auto_corr_max_ofdm_x1 = 140,
        .auto_corr_max_ofdm_mrc_x1 = 270,

        .auto_corr_min_cck = 125,
        .auto_corr_max_cck = 200,
        .auto_corr_min_cck_mrc = 200,
        .auto_corr_max_cck_mrc = 400,

        .nrg_th_cck = 100,
        .nrg_th_ofdm = 100,
};

static void iwl4965_set_ct_threshold(struct iwl_priv *priv)
{
        /* want Kelvin */
        priv->hw_params.ct_kill_threshold =
                CELSIUS_TO_KELVIN(CT_KILL_THRESHOLD_LEGACY);
}

/**
 * iwl4965_hw_set_hw_params
 *
 * Called when initializing driver
 */
static int iwl4965_hw_set_hw_params(struct iwl_priv *priv)
{

        if ((priv->cfg->mod_params->num_of_queues > IWL49_NUM_QUEUES) ||
            (priv->cfg->mod_params->num_of_queues < IWL_MIN_NUM_QUEUES)) {
                IWL_ERR(priv,
                        "invalid queues_num, should be between %d and %d\n",
                        IWL_MIN_NUM_QUEUES, IWL49_NUM_QUEUES);
                return -EINVAL;
        }

        priv->hw_params.max_txq_num = priv->cfg->mod_params->num_of_queues;
        priv->hw_params.dma_chnl_num = FH49_TCSR_CHNL_NUM;
        priv->hw_params.scd_bc_tbls_size =
                        IWL49_NUM_QUEUES * sizeof(struct iwl4965_scd_bc_tbl);
        priv->hw_params.tfd_size = sizeof(struct iwl_tfd);
        priv->hw_params.max_stations = IWL4965_STATION_COUNT;
        priv->hw_params.bcast_sta_id = IWL4965_BROADCAST_ID;
        priv->hw_params.max_data_size = IWL49_RTC_DATA_SIZE;
        priv->hw_params.max_inst_size = IWL49_RTC_INST_SIZE;
        priv->hw_params.max_bsm_size = BSM_SRAM_SIZE;
        priv->hw_params.ht40_channel = BIT(IEEE80211_BAND_5GHZ);

        priv->hw_params.rx_wrt_ptr_reg = FH_RSCSR_CHNL0_WPTR;

        priv->hw_params.tx_chains_num = 2;
        priv->hw_params.rx_chains_num = 2;
        priv->hw_params.valid_tx_ant = ANT_A | ANT_B;
        priv->hw_params.valid_rx_ant = ANT_A | ANT_B;
        if (priv->cfg->ops->lib->temp_ops.set_ct_kill)
                priv->cfg->ops->lib->temp_ops.set_ct_kill(priv);

        priv->hw_params.sens = &iwl4965_sensitivity;

        return 0;
}

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 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;

        return -1;
}

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

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

                if ((channel >= priv->calib_info->band_info[b].ch_from)
                    && (channel <= priv->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 iwl_priv *priv, u32 channel,
                                    struct iwl_eeprom_calib_ch_info *chan_info)
{
        s32 s = -1;
        u32 c;
        u32 m;
        const struct iwl_eeprom_calib_measure *m1;
        const struct iwl_eeprom_calib_measure *m2;
        struct iwl_eeprom_calib_measure *omeas;
        u32 ch_i1;
        u32 ch_i2;

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

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

        IWL_DEBUG_TXPOWER(priv, "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->calib_info->band_info[s].ch1.
                               measurements[c][m]);
                        m2 = &(priv->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(priv,
                                "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(priv,
                                "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(priv,
                                "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(priv,
                                "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 iwl_priv *priv, u8 band, u16 channel,
                                    u8 is_ht40, 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 iwl_channel_info *ch_info = NULL;
        struct iwl_eeprom_calib_ch_info ch_eeprom_info;
        const struct iwl_eeprom_calib_measure *measurement;
        s16 voltage;
        s32 init_voltage;
        s32 voltage_compensation;
        s32 degrees_per_05db_num;
        s32 degrees_per_05db_denom;
        s32 factory_temp;
        s32 temperature_comp[2];
        s32 factory_gain_index[2];
        s32 factory_actual_pwr[2];
        s32 power_index;

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

        /* Get current (RXON) channel, band, width */
        IWL_DEBUG_TXPOWER(priv, "chan %d band %d is_ht40 %d\n", channel, band,
                          is_ht40);

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

        if (!is_channel_valid(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) {
                IWL_ERR(priv, "Can't find txatten group for channel %d.\n",
                          channel);
                return -EINVAL;
        }

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

        if (is_ht40) {
                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->calib_info->saturation_power24;
        else
                saturation_power = priv->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_ht40)
                reg_limit = ch_info->ht40_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->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(priv, "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(priv, "chain = %d\n", c);
                IWL_DEBUG_TXPOWER(priv, "fctry tmp %d, "
                                  "curr tmp %d, comp %d steps\n",
                                  factory_temp, current_temp,
                                  temperature_comp[c]);

                IWL_DEBUG_TXPOWER(priv, "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(priv, "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(priv, "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_WARN(priv, "txpower index %d > 107\n",
                                            power_index);
                                power_index = 107;
                        }
                        if (power_index < 0) {
                                IWL_WARN(priv, "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(priv, "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_send_tx_power - Configure the TXPOWER level user limit
 *
 * Uses the active RXON for channel, band, and characteristics (ht40, high)
 * The power limit is taken from priv->tx_power_user_lmt.
 */
static int iwl4965_send_tx_power(struct iwl_priv *priv)
{
        struct iwl4965_txpowertable_cmd cmd = { 0 };
        int ret;
        u8 band = 0;
        bool is_ht40 = false;
        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_WARN(priv, "TX Power requested while scanning!\n");
                return -EAGAIN;
        }

        band = priv->band == IEEE80211_BAND_2GHZ;

        is_ht40 =  is_ht40_channel(priv->active_rxon.flags);

        if (is_ht40 &&
            (priv->active_rxon.flags & RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK))
                ctrl_chan_high = 1;

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

        ret = iwl4965_fill_txpower_tbl(priv, band,
                                le16_to_cpu(priv->active_rxon.channel),
                                is_ht40, ctrl_chan_high, &cmd.tx_power);
        if (ret)
                goto out;

        ret = iwl_send_cmd_pdu(priv, REPLY_TX_PWR_TABLE_CMD, sizeof(cmd), &cmd);

out:
        return ret;
}

static int iwl4965_send_rxon_assoc(struct iwl_priv *priv)
{
        int ret = 0;
        struct iwl4965_rxon_assoc_cmd rxon_assoc;
        const struct iwl_rxon_cmd *rxon1 = &priv->staging_rxon;
        const struct iwl_rxon_cmd *rxon2 = &priv->active_rxon;

        if ((rxon1->flags == rxon2->flags) &&
            (rxon1->filter_flags == rxon2->filter_flags) &&
            (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
            (rxon1->ofdm_ht_single_stream_basic_rates ==
             rxon2->ofdm_ht_single_stream_basic_rates) &&
            (rxon1->ofdm_ht_dual_stream_basic_rates ==
             rxon2->ofdm_ht_dual_stream_basic_rates) &&
            (rxon1->rx_chain == rxon2->rx_chain) &&
            (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
                IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
                return 0;
        }

        rxon_assoc.flags = priv->staging_rxon.flags;
        rxon_assoc.filter_flags = priv->staging_rxon.filter_flags;
        rxon_assoc.ofdm_basic_rates = priv->staging_rxon.ofdm_basic_rates;
        rxon_assoc.cck_basic_rates = priv->staging_rxon.cck_basic_rates;
        rxon_assoc.reserved = 0;
        rxon_assoc.ofdm_ht_single_stream_basic_rates =
            priv->staging_rxon.ofdm_ht_single_stream_basic_rates;
        rxon_assoc.ofdm_ht_dual_stream_basic_rates =
            priv->staging_rxon.ofdm_ht_dual_stream_basic_rates;
        rxon_assoc.rx_chain_select_flags = priv->staging_rxon.rx_chain;

        ret = iwl_send_cmd_pdu_async(priv, REPLY_RXON_ASSOC,
                                     sizeof(rxon_assoc), &rxon_assoc, NULL);
        if (ret)
                return ret;

        return ret;
}

#ifdef IEEE80211_CONF_CHANNEL_SWITCH
static int iwl4965_hw_channel_switch(struct iwl_priv *priv, u16 channel)
{
        int rc;
        u8 band = 0;
        bool is_ht40 = false;
        u8 ctrl_chan_high = 0;
        struct iwl4965_channel_switch_cmd cmd = { 0 };
        const struct iwl_channel_info *ch_info;

        band = priv->band == IEEE80211_BAND_2GHZ;

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

        is_ht40 = is_ht40_channel(priv->staging_rxon.flags);

        if (is_ht40 &&
            (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_ht40,
                                      ctrl_chan_high, &cmd.tx_power);
        if (rc) {
                IWL_DEBUG_11H(priv, "error:%d  fill txpower_tbl\n", rc);
                return rc;
        }

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

/**
 * iwl4965_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
 */
static void iwl4965_txq_update_byte_cnt_tbl(struct iwl_priv *priv,
                                            struct iwl_tx_queue *txq,
                                            u16 byte_cnt)
{
        struct iwl4965_scd_bc_tbl *scd_bc_tbl = priv->scd_bc_tbls.addr;
        int txq_id = txq->q.id;
        int write_ptr = txq->q.write_ptr;
        int len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE;
        __le16 bc_ent;

        WARN_ON(len > 0xFFF || write_ptr >= TFD_QUEUE_SIZE_MAX);

        bc_ent = cpu_to_le16(len & 0xFFF);
        /* Set up byte count within first 256 entries */
        scd_bc_tbl[txq_id].tfd_offset[write_ptr] = bc_ent;

        /* If within first 64 entries, duplicate at end */
        if (write_ptr < TFD_QUEUE_SIZE_BC_DUP)
                scd_bc_tbl[txq_id].
                        tfd_offset[TFD_QUEUE_SIZE_MAX + write_ptr] = bc_ent;
}

/**
 * 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_hw_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
 */
static int iwl4965_hw_get_temperature(struct iwl_priv *priv)
{
        s32 temperature;
        s32 vt;
        s32 R1, R2, R3;
        u32 R4;

        if (test_bit(STATUS_TEMPERATURE, &priv->status) &&
                (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK)) {
                IWL_DEBUG_TEMP(priv, "Running HT40 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(priv, "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(priv, "Calib values R[1-3]: %d %d %d R4: %d\n", R1, R2, R3, vt);

        if (R3 == R1) {
                IWL_ERR(priv, "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(priv, "Calibrated temperature: %dK, %dC\n",
                        temperature, KELVIN_TO_CELSIUS(temperature));

        return temperature;
}

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

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

        if (!test_bit(STATUS_STATISTICS, &priv->status)) {
                IWL_DEBUG_TEMP(priv, "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(priv, "Getting cooler, delta %d, \n", temp_diff);
                temp_diff = -temp_diff;
        } else if (temp_diff == 0)
                IWL_DEBUG_POWER(priv, "Same temp, \n");
        else
                IWL_DEBUG_POWER(priv, "Getting warmer, delta %d, \n", temp_diff);

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

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

        return 1;
}

static void iwl4965_temperature_calib(struct iwl_priv *priv)
{
        s32 temp;

        temp = iwl4965_hw_get_temperature(priv);
        if (temp < 0)
                return;

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

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

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

/**
 * iwl4965_tx_queue_stop_scheduler - Stop queue, but keep configuration
 */
static void iwl4965_tx_queue_stop_scheduler(struct iwl_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. */
        iwl_write_prph(priv,
                IWL49_SCD_QUEUE_STATUS_BITS(txq_id),
                (0 << IWL49_SCD_QUEUE_STTS_REG_POS_ACTIVE)|
                (1 << IWL49_SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN));
}

/**
 * txq_id must be greater than IWL49_FIRST_AMPDU_QUEUE
 * priv->lock must be held by the caller
 */
static int iwl4965_txq_agg_disable(struct iwl_priv *priv, u16 txq_id,
                                   u16 ssn_idx, u8 tx_fifo)
{
        if ((IWL49_FIRST_AMPDU_QUEUE > txq_id) ||
            (IWL49_FIRST_AMPDU_QUEUE + IWL49_NUM_AMPDU_QUEUES <= txq_id)) {
                IWL_WARN(priv,
                        "queue number out of range: %d, must be %d to %d\n",
                        txq_id, IWL49_FIRST_AMPDU_QUEUE,
                        IWL49_FIRST_AMPDU_QUEUE + IWL49_NUM_AMPDU_QUEUES - 1);
                return -EINVAL;
        }

        iwl4965_tx_queue_stop_scheduler(priv, txq_id);

        iwl_clear_bits_prph(priv, IWL49_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);

        iwl_clear_bits_prph(priv, IWL49_SCD_INTERRUPT_MASK, (1 << txq_id));
        iwl_txq_ctx_deactivate(priv, txq_id);
        iwl4965_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 0);

        return 0;
}

/**
 * iwl4965_tx_queue_set_q2ratid - Map unique receiver/tid combination to a queue
 */
static int iwl4965_tx_queue_set_q2ratid(struct iwl_priv *priv, u16 ra_tid,
                                        u16 txq_id)
{
        u32 tbl_dw_addr;
        u32 tbl_dw;
        u16 scd_q2ratid;

        scd_q2ratid = ra_tid & IWL_SCD_QUEUE_RA_TID_MAP_RATID_MSK;

        tbl_dw_addr = priv->scd_base_addr +
                        IWL49_SCD_TRANSLATE_TBL_OFFSET_QUEUE(txq_id);

        tbl_dw = iwl_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);

        iwl_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 IWL49_FIRST_AMPDU_QUEUE,
 *        i.e. it must be one of the higher queues used for aggregation
 */
static int iwl4965_txq_agg_enable(struct iwl_priv *priv, int txq_id,
                                  int tx_fifo, int sta_id, int tid, u16 ssn_idx)
{
        unsigned long flags;
        u16 ra_tid;

        if ((IWL49_FIRST_AMPDU_QUEUE > txq_id) ||
            (IWL49_FIRST_AMPDU_QUEUE + IWL49_NUM_AMPDU_QUEUES <= txq_id)) {
                IWL_WARN(priv,
                        "queue number out of range: %d, must be %d to %d\n",
                        txq_id, IWL49_FIRST_AMPDU_QUEUE,
                        IWL49_FIRST_AMPDU_QUEUE + IWL49_NUM_AMPDU_QUEUES - 1);
                return -EINVAL;
        }

        ra_tid = BUILD_RAxTID(sta_id, tid);

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

        spin_lock_irqsave(&priv->lock, flags);

        /* 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 */
        iwl_set_bits_prph(priv, IWL49_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 */
        iwl_write_targ_mem(priv,
                priv->scd_base_addr + IWL49_SCD_CONTEXT_QUEUE_OFFSET(txq_id),
                (SCD_WIN_SIZE << IWL49_SCD_QUEUE_CTX_REG1_WIN_SIZE_POS) &
                IWL49_SCD_QUEUE_CTX_REG1_WIN_SIZE_MSK);

        iwl_write_targ_mem(priv, priv->scd_base_addr +
                IWL49_SCD_CONTEXT_QUEUE_OFFSET(txq_id) + sizeof(u32),
                (SCD_FRAME_LIMIT << IWL49_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS)
                & IWL49_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK);

        iwl_set_bits_prph(priv, IWL49_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);

        spin_unlock_irqrestore(&priv->lock, flags);

        return 0;
}


static u16 iwl4965_get_hcmd_size(u8 cmd_id, u16 len)
{
        switch (cmd_id) {
        case REPLY_RXON:
                return (u16) sizeof(struct iwl4965_rxon_cmd);
        default:
                return len;
        }
}

static u16 iwl4965_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd, u8 *data)
{
        struct iwl4965_addsta_cmd *addsta = (struct iwl4965_addsta_cmd *)data;
        addsta->mode = cmd->mode;
        memcpy(&addsta->sta, &cmd->sta, sizeof(struct sta_id_modify));
        memcpy(&addsta->key, &cmd->key, sizeof(struct iwl4965_keyinfo));
        addsta->station_flags = cmd->station_flags;
        addsta->station_flags_msk = cmd->station_flags_msk;
        addsta->tid_disable_tx = cmd->tid_disable_tx;
        addsta->add_immediate_ba_tid = cmd->add_immediate_ba_tid;
        addsta->remove_immediate_ba_tid = cmd->remove_immediate_ba_tid;
        addsta->add_immediate_ba_ssn = cmd->add_immediate_ba_ssn;
        addsta->reserved1 = cpu_to_le16(0);
        addsta->reserved2 = cpu_to_le32(0);

        return (u16)sizeof(struct iwl4965_addsta_cmd);
}

static inline u32 iwl4965_get_scd_ssn(struct iwl4965_tx_resp *tx_resp)
{
        return le32_to_cpup(&tx_resp->u.status + tx_resp->frame_count) & MAX_SN;
}

/**
 * iwl4965_tx_status_reply_tx - Handle Tx response for frames in aggregation queue
 */
static int iwl4965_tx_status_reply_tx(struct iwl_priv *priv,
                                      struct iwl_ht_agg *agg,
                                      struct iwl4965_tx_resp *tx_resp,
                                      int txq_id, u16 start_idx)
{
        u16 status;
        struct agg_tx_status *frame_status = tx_resp->u.agg_status;
        struct ieee80211_tx_info *info = NULL;
        struct ieee80211_hdr *hdr = NULL;
        u32 rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
        int i, sh, idx;
        u16 seq;
        if (agg->wait_for_ba)
                IWL_DEBUG_TX_REPLY(priv, "got tx response w/o block-ack\n");

        agg->frame_count = tx_resp->frame_count;
        agg->start_idx = start_idx;
        agg->rate_n_flags = rate_n_flags;
        agg->bitmap = 0;

        /* num frames attempted by Tx command */
        if (agg->frame_count == 1) {
                /* Only one frame was attempted; no block-ack will arrive */
                status = le16_to_cpu(frame_status[0].status);
                idx = start_idx;

                /* FIXME: code repetition */
                IWL_DEBUG_TX_REPLY(priv, "FrameCnt = %d, StartIdx=%d idx=%d\n",
                                   agg->frame_count, agg->start_idx, idx);

                info = IEEE80211_SKB_CB(priv->txq[txq_id].txb[idx].skb[0]);
                info->status.rates[0].count = tx_resp->failure_frame + 1;
                info->flags &= ~IEEE80211_TX_CTL_AMPDU;
                info->flags |= iwl_is_tx_success(status) ?
                        IEEE80211_TX_STAT_ACK : 0;
                iwl_hwrate_to_tx_control(priv, rate_n_flags, info);
                /* FIXME: code repetition end */

                IWL_DEBUG_TX_REPLY(priv, "1 Frame 0x%x failure :%d\n",
                                    status & 0xff, tx_resp->failure_frame);

                IWL_DEBUG_TX_REPLY(priv, "Rate Info rate_n_flags=%x\n", rate_n_flags);

                agg->wait_for_ba = 0;
        } else {
                /* Two or more frames were attempted; expect block-ack */
                u64 bitmap = 0;
                int start = agg->start_idx;

                /* Construct bit-map of pending frames within Tx window */
                for (i = 0; i < agg->frame_count; i++) {
                        u16 sc;
                        status = le16_to_cpu(frame_status[i].status);
                        seq  = le16_to_cpu(frame_status[i].sequence);
                        idx = SEQ_TO_INDEX(seq);
                        txq_id = SEQ_TO_QUEUE(seq);

                        if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
                                      AGG_TX_STATE_ABORT_MSK))
                                continue;

                        IWL_DEBUG_TX_REPLY(priv, "FrameCnt = %d, txq_id=%d idx=%d\n",
                                           agg->frame_count, txq_id, idx);

                        hdr = iwl_tx_queue_get_hdr(priv, txq_id, idx);
                        if (!hdr) {
                                IWL_ERR(priv,
                                        "BUG_ON idx doesn't point to valid skb"
                                        " idx=%d, txq_id=%d\n", idx, txq_id);
                                return -1;
                        }

                        sc = le16_to_cpu(hdr->seq_ctrl);
                        if (idx != (SEQ_TO_SN(sc) & 0xff)) {
                                IWL_ERR(priv,
                                        "BUG_ON idx doesn't match seq control"
                                        " idx=%d, seq_idx=%d, seq=%d\n",
                                        idx, SEQ_TO_SN(sc), hdr->seq_ctrl);
                                return -1;
                        }

                        IWL_DEBUG_TX_REPLY(priv, "AGG Frame i=%d idx %d seq=%d\n",
                                           i, idx, SEQ_TO_SN(sc));

                        sh = idx - start;
                        if (sh > 64) {
                                sh = (start - idx) + 0xff;
                                bitmap = bitmap << sh;
                                sh = 0;
                                start = idx;
                        } else if (sh < -64)
                                sh  = 0xff - (start - idx);
                        else if (sh < 0) {
                                sh = start - idx;
                                start = idx;
                                bitmap = bitmap << sh;
                                sh = 0;
                        }
                        bitmap |= 1ULL << sh;
                        IWL_DEBUG_TX_REPLY(priv, "start=%d bitmap=0x%llx\n",
                                           start, (unsigned long long)bitmap);
                }

                agg->bitmap = bitmap;
                agg->start_idx = start;
                IWL_DEBUG_TX_REPLY(priv, "Frames %d start_idx=%d bitmap=0x%llx\n",
                                   agg->frame_count, agg->start_idx,
                                   (unsigned long long)agg->bitmap);

                if (bitmap)
                        agg->wait_for_ba = 1;
        }
        return 0;
}

/**
 * iwl4965_rx_reply_tx - Handle standard (non-aggregation) Tx response
 */
static void iwl4965_rx_reply_tx(struct iwl_priv *priv,
                                struct iwl_rx_mem_buffer *rxb)
{
        struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
        u16 sequence = le16_to_cpu(pkt->hdr.sequence);
        int txq_id = SEQ_TO_QUEUE(sequence);
        int index = SEQ_TO_INDEX(sequence);
        struct iwl_tx_queue *txq = &priv->txq[txq_id];
        struct ieee80211_hdr *hdr;
        struct ieee80211_tx_info *info;
        struct iwl4965_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
        u32  status = le32_to_cpu(tx_resp->u.status);
        int tid = MAX_TID_COUNT;
        int sta_id;
        int freed;
        u8 *qc = NULL;

        if ((index >= txq->q.n_bd) || (iwl_queue_used(&txq->q, index) == 0)) {
                IWL_ERR(priv, "Read index for DMA queue txq_id (%d) index %d "
                          "is out of range [0-%d] %d %d\n", txq_id,
                          index, txq->q.n_bd, txq->q.write_ptr,
                          txq->q.read_ptr);
                return;
        }

        info = IEEE80211_SKB_CB(txq->txb[txq->q.read_ptr].skb[0]);
        memset(&info->status, 0, sizeof(info->status));

        hdr = iwl_tx_queue_get_hdr(priv, txq_id, index);
        if (ieee80211_is_data_qos(hdr->frame_control)) {
                qc = ieee80211_get_qos_ctl(hdr);
                tid = qc[0] & 0xf;
        }

        sta_id = iwl_get_ra_sta_id(priv, hdr);
        if (txq->sched_retry && unlikely(sta_id == IWL_INVALID_STATION)) {
                IWL_ERR(priv, "Station not known\n");
                return;
        }

        if (txq->sched_retry) {
                const u32 scd_ssn = iwl4965_get_scd_ssn(tx_resp);
                struct iwl_ht_agg *agg = NULL;

                WARN_ON(!qc);

                agg = &priv->stations[sta_id].tid[tid].agg;

                iwl4965_tx_status_reply_tx(priv, agg, tx_resp, txq_id, index);

                /* check if BAR is needed */
                if ((tx_resp->frame_count == 1) && !iwl_is_tx_success(status))
                        info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;

                if (txq->q.read_ptr != (scd_ssn & 0xff)) {
                        index = iwl_queue_dec_wrap(scd_ssn & 0xff, txq->q.n_bd);
                        IWL_DEBUG_TX_REPLY(priv, "Retry scheduler reclaim scd_ssn "
                                           "%d index %d\n", scd_ssn , index);
                        freed = iwl_tx_queue_reclaim(priv, txq_id, index);
                        priv->stations[sta_id].tid[tid].tfds_in_queue -= freed;

                        if (priv->mac80211_registered &&
                            (iwl_queue_space(&txq->q) > txq->q.low_mark) &&
                            (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA)) {
                                if (agg->state == IWL_AGG_OFF)
                                        iwl_wake_queue(priv, txq_id);
                                else
                                        iwl_wake_queue(priv, txq->swq_id);
                        }
                }
        } else {
                info->status.rates[0].count = tx_resp->failure_frame + 1;
                info->flags |= iwl_is_tx_success(status) ?
                                        IEEE80211_TX_STAT_ACK : 0;
                iwl_hwrate_to_tx_control(priv,
                                        le32_to_cpu(tx_resp->rate_n_flags),
                                        info);

                IWL_DEBUG_TX_REPLY(priv, "TXQ %d status %s (0x%08x) "
                                   "rate_n_flags 0x%x retries %d\n",
                                   txq_id,
                                   iwl_get_tx_fail_reason(status), status,
                                   le32_to_cpu(tx_resp->rate_n_flags),
                                   tx_resp->failure_frame);

                freed = iwl_tx_queue_reclaim(priv, txq_id, index);
                if (qc && likely(sta_id != IWL_INVALID_STATION))
                        priv->stations[sta_id].tid[tid].tfds_in_queue -= freed;

                if (priv->mac80211_registered &&
                    (iwl_queue_space(&txq->q) > txq->q.low_mark))
                        iwl_wake_queue(priv, txq_id);
        }

        if (qc && likely(sta_id != IWL_INVALID_STATION))
                iwl_txq_check_empty(priv, sta_id, tid, txq_id);

        if (iwl_check_bits(status, TX_ABORT_REQUIRED_MSK))
                IWL_ERR(priv, "TODO:  Implement Tx ABORT REQUIRED!!!\n");
}

static int iwl4965_calc_rssi(struct iwl_priv *priv,
                             struct iwl_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_buf;
        u32 agc = (le16_to_cpu(ncphy->agc_info) & IWL49_AGC_DB_MASK)
                        >> IWL49_AGC_DB_POS;

        u32 valid_antennae =
            (le16_to_cpu(rx_resp->phy_flags) & IWL49_RX_PHY_FLAGS_ANTENNAE_MASK)
                        >> IWL49_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(priv, "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 - IWL49_RSSI_OFFSET;
}


/* Set up 4965-specific Rx frame reply handlers */
static void iwl4965_rx_handler_setup(struct iwl_priv *priv)
{
        /* Legacy Rx frames */
        priv->rx_handlers[REPLY_RX] = iwl_rx_reply_rx;
        /* Tx response */
        priv->rx_handlers[REPLY_TX] = iwl4965_rx_reply_tx;
}

static void iwl4965_setup_deferred_work(struct iwl_priv *priv)
{
        INIT_WORK(&priv->txpower_work, iwl4965_bg_txpower_work);
}

static void iwl4965_cancel_deferred_work(struct iwl_priv *priv)
{
        cancel_work_sync(&priv->txpower_work);
}

#define IWL4965_UCODE_GET(item)                                         \
static u32 iwl4965_ucode_get_##item(const struct iwl_ucode_header *ucode,\
                                    u32 api_ver)                        \
{                                                                       \
        return le32_to_cpu(ucode->u.v1.item);                           \
}

static u32 iwl4965_ucode_get_header_size(u32 api_ver)
{
        return UCODE_HEADER_SIZE(1);
}
static u32 iwl4965_ucode_get_build(const struct iwl_ucode_header *ucode,
                                   u32 api_ver)
{
        return 0;
}
static u8 *iwl4965_ucode_get_data(const struct iwl_ucode_header *ucode,
                                  u32 api_ver)
{
        return (u8 *) ucode->u.v1.data;
}

IWL4965_UCODE_GET(inst_size);
IWL4965_UCODE_GET(data_size);
IWL4965_UCODE_GET(init_size);
IWL4965_UCODE_GET(init_data_size);
IWL4965_UCODE_GET(boot_size);

static struct iwl_hcmd_ops iwl4965_hcmd = {
        .rxon_assoc = iwl4965_send_rxon_assoc,
        .commit_rxon = iwl_commit_rxon,
        .set_rxon_chain = iwl_set_rxon_chain,
};

static struct iwl_ucode_ops iwl4965_ucode = {
        .get_header_size = iwl4965_ucode_get_header_size,
        .get_build = iwl4965_ucode_get_build,
        .get_inst_size = iwl4965_ucode_get_inst_size,
        .get_data_size = iwl4965_ucode_get_data_size,
        .get_init_size = iwl4965_ucode_get_init_size,
        .get_init_data_size = iwl4965_ucode_get_init_data_size,
        .get_boot_size = iwl4965_ucode_get_boot_size,
        .get_data = iwl4965_ucode_get_data,
};
static struct iwl_hcmd_utils_ops iwl4965_hcmd_utils = {
        .get_hcmd_size = iwl4965_get_hcmd_size,
        .build_addsta_hcmd = iwl4965_build_addsta_hcmd,
        .chain_noise_reset = iwl4965_chain_noise_reset,
        .gain_computation = iwl4965_gain_computation,
        .rts_tx_cmd_flag = iwl4965_rts_tx_cmd_flag,
        .calc_rssi = iwl4965_calc_rssi,
};

static struct iwl_lib_ops iwl4965_lib = {
        .set_hw_params = iwl4965_hw_set_hw_params,
        .txq_update_byte_cnt_tbl = iwl4965_txq_update_byte_cnt_tbl,
        .txq_set_sched = iwl4965_txq_set_sched,
        .txq_agg_enable = iwl4965_txq_agg_enable,
        .txq_agg_disable = iwl4965_txq_agg_disable,
        .txq_attach_buf_to_tfd = iwl_hw_txq_attach_buf_to_tfd,
        .txq_free_tfd = iwl_hw_txq_free_tfd,
        .txq_init = iwl_hw_tx_queue_init,
        .rx_handler_setup = iwl4965_rx_handler_setup,
        .setup_deferred_work = iwl4965_setup_deferred_work,
        .cancel_deferred_work = iwl4965_cancel_deferred_work,
        .is_valid_rtc_data_addr = iwl4965_hw_valid_rtc_data_addr,
        .alive_notify = iwl4965_alive_notify,
        .init_alive_start = iwl4965_init_alive_start,
        .load_ucode = iwl4965_load_bsm,
        .dump_nic_event_log = iwl_dump_nic_event_log,
        .dump_nic_error_log = iwl_dump_nic_error_log,
        .apm_ops = {
                .init = iwl4965_apm_init,
                .reset = iwl4965_apm_reset,
                .stop = iwl4965_apm_stop,
                .config = iwl4965_nic_config,
                .set_pwr_src = iwl_set_pwr_src,
        },
        .eeprom_ops = {
                .regulatory_bands = {
                        EEPROM_REGULATORY_BAND_1_CHANNELS,
                        EEPROM_REGULATORY_BAND_2_CHANNELS,
                        EEPROM_REGULATORY_BAND_3_CHANNELS,
                        EEPROM_REGULATORY_BAND_4_CHANNELS,
                        EEPROM_REGULATORY_BAND_5_CHANNELS,
                        EEPROM_4965_REGULATORY_BAND_24_HT40_CHANNELS,
                        EEPROM_4965_REGULATORY_BAND_52_HT40_CHANNELS
                },
                .verify_signature  = iwlcore_eeprom_verify_signature,
                .acquire_semaphore = iwlcore_eeprom_acquire_semaphore,
                .release_semaphore = iwlcore_eeprom_release_semaphore,
                .calib_version = iwl4965_eeprom_calib_version,
                .query_addr = iwlcore_eeprom_query_addr,
        },
        .send_tx_power  = iwl4965_send_tx_power,
        .update_chain_flags = iwl_update_chain_flags,
        .post_associate = iwl_post_associate,
        .config_ap = iwl_config_ap,
        .isr = iwl_isr_legacy,
        .temp_ops = {
                .temperature = iwl4965_temperature_calib,
                .set_ct_kill = iwl4965_set_ct_threshold,
        },
};

static struct iwl_ops iwl4965_ops = {
        .ucode = &iwl4965_ucode,
        .lib = &iwl4965_lib,
        .hcmd = &iwl4965_hcmd,
        .utils = &iwl4965_hcmd_utils,
};

struct iwl_cfg iwl4965_agn_cfg = {
        .name = "4965AGN",
        .fw_name_pre = IWL4965_FW_PRE,
        .ucode_api_max = IWL4965_UCODE_API_MAX,
        .ucode_api_min = IWL4965_UCODE_API_MIN,
        .sku = IWL_SKU_A|IWL_SKU_G|IWL_SKU_N,
        .eeprom_size = IWL4965_EEPROM_IMG_SIZE,
        .eeprom_ver = EEPROM_4965_EEPROM_VERSION,
        .eeprom_calib_ver = EEPROM_4965_TX_POWER_VERSION,
        .ops = &iwl4965_ops,
        .mod_params = &iwl4965_mod_params,
        .use_isr_legacy = true,
        .ht_greenfield_support = false,
        .broken_powersave = true,
};

/* Module firmware */
MODULE_FIRMWARE(IWL4965_MODULE_FIRMWARE(IWL4965_UCODE_API_MAX));

module_param_named(antenna, iwl4965_mod_params.antenna, int, 0444);
MODULE_PARM_DESC(antenna, "select antenna (1=Main, 2=Aux, default 0 [both])");
module_param_named(swcrypto, iwl4965_mod_params.sw_crypto, int, 0444);
MODULE_PARM_DESC(swcrypto, "using crypto in software (default 0 [hardware])");
module_param_named(
        disable_hw_scan, iwl4965_mod_params.disable_hw_scan, int, 0444);
MODULE_PARM_DESC(disable_hw_scan, "disable hardware scanning (default 0)");

module_param_named(queues_num, iwl4965_mod_params.num_of_queues, int, 0444);
MODULE_PARM_DESC(queues_num, "number of hw queues.");
/* 11n */
module_param_named(11n_disable, iwl4965_mod_params.disable_11n, int, 0444);
MODULE_PARM_DESC(11n_disable, "disable 11n functionality");
module_param_named(amsdu_size_8K, iwl4965_mod_params.amsdu_size_8K, int, 0444);
MODULE_PARM_DESC(amsdu_size_8K, "enable 8K amsdu size");

module_param_named(fw_restart4965, iwl4965_mod_params.restart_fw, int, 0444);
MODULE_PARM_DESC(fw_restart4965, "restart firmware in case of error");