/******************************************************************************
 *
 * Copyright(c) 2003 - 2011 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 <net/mac80211.h>
#include <linux/etherdevice.h>
#include <asm/unaligned.h>

#include "common.h"
#include "4965.h"

/**
 * il_verify_inst_sparse - verify runtime uCode image in card vs. host,
 *   using sample data 100 bytes apart.  If these sample points are good,
 *   it's a pretty good bet that everything between them is good, too.
 */
static int
il4965_verify_inst_sparse(struct il_priv *il, __le32 * image, u32 len)
{
        u32 val;
        int ret = 0;
        u32 errcnt = 0;
        u32 i;

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

        for (i = 0; i < len; i += 100, image += 100 / sizeof(u32)) {
                /* read data comes through single port, auto-incr addr */
                /* NOTE: Use the debugless read so we don't flood kernel log
                 * if IL_DL_IO is set */
                il_wr(il, HBUS_TARG_MEM_RADDR, i + IL4965_RTC_INST_LOWER_BOUND);
                val = _il_rd(il, HBUS_TARG_MEM_RDAT);
                if (val != le32_to_cpu(*image)) {
                        ret = -EIO;
                        errcnt++;
                        if (errcnt >= 3)
                                break;
                }
        }

        return ret;
}

/**
 * il4965_verify_inst_full - verify runtime uCode image in card vs. host,
 *     looking at all data.
 */
static int
il4965_verify_inst_full(struct il_priv *il, __le32 * image, u32 len)
{
        u32 val;
        u32 save_len = len;
        int ret = 0;
        u32 errcnt;

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

        il_wr(il, HBUS_TARG_MEM_RADDR, IL4965_RTC_INST_LOWER_BOUND);

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

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

        return ret;
}

/**
 * il4965_verify_ucode - determine which instruction image is in SRAM,
 *    and verify its contents
 */
int
il4965_verify_ucode(struct il_priv *il)
{
        __le32 *image;
        u32 len;
        int ret;

        /* Try bootstrap */
        image = (__le32 *) il->ucode_boot.v_addr;
        len = il->ucode_boot.len;
        ret = il4965_verify_inst_sparse(il, image, len);
        if (!ret) {
                D_INFO("Bootstrap uCode is good in inst SRAM\n");
                return 0;
        }

        /* Try initialize */
        image = (__le32 *) il->ucode_init.v_addr;
        len = il->ucode_init.len;
        ret = il4965_verify_inst_sparse(il, image, len);
        if (!ret) {
                D_INFO("Initialize uCode is good in inst SRAM\n");
                return 0;
        }

        /* Try runtime/protocol */
        image = (__le32 *) il->ucode_code.v_addr;
        len = il->ucode_code.len;
        ret = il4965_verify_inst_sparse(il, image, len);
        if (!ret) {
                D_INFO("Runtime uCode is good in inst SRAM\n");
                return 0;
        }

        IL_ERR("NO VALID UCODE IMAGE IN INSTRUCTION SRAM!!\n");

        /* Since nothing seems to match, show first several data entries in
         * instruction SRAM, so maybe visual inspection will give a clue.
         * Selection of bootstrap image (vs. other images) is arbitrary. */
        image = (__le32 *) il->ucode_boot.v_addr;
        len = il->ucode_boot.len;
        ret = il4965_verify_inst_full(il, image, len);

        return ret;
}

/******************************************************************************
 *
 * EEPROM related functions
 *
******************************************************************************/

/*
 * 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
il4965_eeprom_acquire_semaphore(struct il_priv *il)
{
        u16 count;
        int ret;

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

                /* See if we got it */
                ret =
                    _il_poll_bit(il, 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 (ret >= 0)
                        return ret;
        }

        return ret;
}

void
il4965_eeprom_release_semaphore(struct il_priv *il)
{
        il_clear_bit(il, CSR_HW_IF_CONFIG_REG,
                     CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);

}

int
il4965_eeprom_check_version(struct il_priv *il)
{
        u16 eeprom_ver;
        u16 calib_ver;

        eeprom_ver = il_eeprom_query16(il, EEPROM_VERSION);
        calib_ver = il_eeprom_query16(il, EEPROM_4965_CALIB_VERSION_OFFSET);

        if (eeprom_ver < il->cfg->eeprom_ver ||
            calib_ver < il->cfg->eeprom_calib_ver)
                goto err;

        IL_INFO("device EEPROM VER=0x%x, CALIB=0x%x\n", eeprom_ver, calib_ver);

        return 0;
err:
        IL_ERR("Unsupported (too old) EEPROM VER=0x%x < 0x%x "
               "CALIB=0x%x < 0x%x\n", eeprom_ver, il->cfg->eeprom_ver,
               calib_ver, il->cfg->eeprom_calib_ver);
        return -EINVAL;

}

void
il4965_eeprom_get_mac(const struct il_priv *il, u8 * mac)
{
        const u8 *addr = il_eeprom_query_addr(il,
                                              EEPROM_MAC_ADDRESS);
        memcpy(mac, addr, ETH_ALEN);
}

/* Send led command */
static int
il4965_send_led_cmd(struct il_priv *il, struct il_led_cmd *led_cmd)
{
        struct il_host_cmd cmd = {
                .id = C_LEDS,
                .len = sizeof(struct il_led_cmd),
                .data = led_cmd,
                .flags = CMD_ASYNC,
                .callback = NULL,
        };
        u32 reg;

        reg = _il_rd(il, CSR_LED_REG);
        if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
                _il_wr(il, CSR_LED_REG, reg & CSR_LED_BSM_CTRL_MSK);

        return il_send_cmd(il, &cmd);
}

/* Set led register off */
void
il4965_led_enable(struct il_priv *il)
{
        _il_wr(il, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
}

static int il4965_send_tx_power(struct il_priv *il);
static int il4965_hw_get_temperature(struct il_priv *il);

/* Highest firmware API version supported */
#define IL4965_UCODE_API_MAX 2

/* Lowest firmware API version supported */
#define IL4965_UCODE_API_MIN 2

#define IL4965_FW_PRE "iwlwifi-4965-"
#define _IL4965_MODULE_FIRMWARE(api) IL4965_FW_PRE #api ".ucode"
#define IL4965_MODULE_FIRMWARE(api) _IL4965_MODULE_FIRMWARE(api)

/* check contents of special bootstrap uCode SRAM */
static int
il4965_verify_bsm(struct il_priv *il)
{
        __le32 *image = il->ucode_boot.v_addr;
        u32 len = il->ucode_boot.len;
        u32 reg;
        u32 val;

        D_INFO("Begin verify bsm\n");

        /* verify BSM SRAM contents */
        val = il_rd_prph(il, BSM_WR_DWCOUNT_REG);
        for (reg = BSM_SRAM_LOWER_BOUND; reg < BSM_SRAM_LOWER_BOUND + len;
             reg += sizeof(u32), image++) {
                val = il_rd_prph(il, reg);
                if (val != le32_to_cpu(*image)) {
                        IL_ERR("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;
                }
        }

        D_INFO("BSM bootstrap uCode image OK\n");

        return 0;
}

/**
 * il4965_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
il4965_load_bsm(struct il_priv *il)
{
        __le32 *image = il->ucode_boot.v_addr;
        u32 len = il->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;

        D_INFO("Begin load bsm\n");

        il->ucode_type = UCODE_RT;

        /* make sure bootstrap program is no larger than BSM's SRAM size */
        if (len > IL49_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:  il_init_alive_start() will replace these values,
         *        after the "initialize" uCode has run, to point to
         *        runtime/protocol instructions and backup data cache.
         */
        pinst = il->ucode_init.p_addr >> 4;
        pdata = il->ucode_init_data.p_addr >> 4;
        inst_len = il->ucode_init.len;
        data_len = il->ucode_init_data.len;

        il_wr_prph(il, BSM_DRAM_INST_PTR_REG, pinst);
        il_wr_prph(il, BSM_DRAM_DATA_PTR_REG, pdata);
        il_wr_prph(il, BSM_DRAM_INST_BYTECOUNT_REG, inst_len);
        il_wr_prph(il, 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++)
                _il_wr_prph(il, reg_offset, le32_to_cpu(*image));

        ret = il4965_verify_bsm(il);
        if (ret)
                return ret;

        /* Tell BSM to copy from BSM SRAM into instruction SRAM, when asked */
        il_wr_prph(il, BSM_WR_MEM_SRC_REG, 0x0);
        il_wr_prph(il, BSM_WR_MEM_DST_REG, IL49_RTC_INST_LOWER_BOUND);
        il_wr_prph(il, BSM_WR_DWCOUNT_REG, len / sizeof(u32));

        /* Load bootstrap code into instruction SRAM now,
         *   to prepare to load "initialize" uCode */
        il_wr_prph(il, 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 = il_rd_prph(il, BSM_WR_CTRL_REG);
                if (!(done & BSM_WR_CTRL_REG_BIT_START))
                        break;
                udelay(10);
        }
        if (i < 100)
                D_INFO("BSM write complete, poll %d iterations\n", i);
        else {
                IL_ERR("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) */
        il_wr_prph(il, BSM_WR_CTRL_REG, BSM_WR_CTRL_REG_BIT_START_EN);

        return 0;
}

/**
 * il4965_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
il4965_set_ucode_ptrs(struct il_priv *il)
{
        dma_addr_t pinst;
        dma_addr_t pdata;
        int ret = 0;

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

        /* Tell bootstrap uCode where to find image to load */
        il_wr_prph(il, BSM_DRAM_INST_PTR_REG, pinst);
        il_wr_prph(il, BSM_DRAM_DATA_PTR_REG, pdata);
        il_wr_prph(il, BSM_DRAM_DATA_BYTECOUNT_REG, il->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 */
        il_wr_prph(il, BSM_DRAM_INST_BYTECOUNT_REG,
                   il->ucode_code.len | BSM_DRAM_INST_LOAD);
        D_INFO("Runtime uCode pointers are set.\n");

        return ret;
}

/**
 * il4965_init_alive_start - Called after N_ALIVE notification received
 *
 * Called after N_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 il
 *   (3945 does not contain this data).
 *
 * Tell "initialize" uCode to go ahead and load the runtime uCode.
*/
static void
il4965_init_alive_start(struct il_priv *il)
{
        /* 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 (il4965_verify_ucode(il)) {
                /* Runtime instruction load was bad;
                 * take it all the way back down so we can try again */
                D_INFO("Bad \"initialize\" uCode load.\n");
                goto restart;
        }

        /* Calculate temperature */
        il->temperature = il4965_hw_get_temperature(il);

        /* Send pointers to protocol/runtime uCode image ... init code will
         * load and launch runtime uCode, which will send us another "Alive"
         * notification. */
        D_INFO("Initialization Alive received.\n");
        if (il4965_set_ucode_ptrs(il)) {
                /* Runtime instruction load won't happen;
                 * take it all the way back down so we can try again */
                D_INFO("Couldn't set up uCode pointers.\n");
                goto restart;
        }
        return;

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

static bool
iw4965_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);
}

void
il4965_nic_config(struct il_priv *il)
{
        unsigned long flags;
        u16 radio_cfg;

        spin_lock_irqsave(&il->lock, flags);

        radio_cfg = il_eeprom_query16(il, EEPROM_RADIO_CONFIG);

        /* write radio config values to register */
        if (EEPROM_RF_CFG_TYPE_MSK(radio_cfg) == EEPROM_4965_RF_CFG_TYPE_MAX)
                il_set_bit(il, 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 */
        il_set_bit(il, CSR_HW_IF_CONFIG_REG,
                   CSR_HW_IF_CONFIG_REG_BIT_RADIO_SI |
                   CSR_HW_IF_CONFIG_REG_BIT_MAC_SI);

        il->calib_info =
            (struct il_eeprom_calib_info *)
            il_eeprom_query_addr(il, EEPROM_4965_CALIB_TXPOWER_OFFSET);

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

/* 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
il4965_chain_noise_reset(struct il_priv *il)
{
        struct il_chain_noise_data *data = &(il->chain_noise_data);

        if (data->state == IL_CHAIN_NOISE_ALIVE && il_is_any_associated(il)) {
                struct il_calib_diff_gain_cmd cmd;

                /* clear data for chain noise calibration algorithm */
                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;

                memset(&cmd, 0, sizeof(cmd));
                cmd.hdr.op_code = IL_PHY_CALIBRATE_DIFF_GAIN_CMD;
                cmd.diff_gain_a = 0;
                cmd.diff_gain_b = 0;
                cmd.diff_gain_c = 0;
                if (il_send_cmd_pdu(il, C_PHY_CALIBRATION, sizeof(cmd), &cmd))
                        IL_ERR("Could not send C_PHY_CALIBRATION\n");
                data->state = IL_CHAIN_NOISE_ACCUMULATE;
                D_CALIB("Run chain_noise_calibrate\n");
        }
}

static s32
il4965_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;
}

/**
 * il4965_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 idx,
 * 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 idx).
 */
static s32
il4965_get_voltage_compensation(s32 eeprom_voltage, s32 current_voltage)
{
        s32 comp = 0;

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

        il4965_math_div_round(current_voltage - eeprom_voltage,
                              TX_POWER_IL_VOLTAGE_CODES_PER_03V, &comp);

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

        return comp;
}

static s32
il4965_get_tx_atten_grp(u16 channel)
{
        if (channel >= CALIB_IL_TX_ATTEN_GR5_FCH &&
            channel <= CALIB_IL_TX_ATTEN_GR5_LCH)
                return CALIB_CH_GROUP_5;

        if (channel >= CALIB_IL_TX_ATTEN_GR1_FCH &&
            channel <= CALIB_IL_TX_ATTEN_GR1_LCH)
                return CALIB_CH_GROUP_1;

        if (channel >= CALIB_IL_TX_ATTEN_GR2_FCH &&
            channel <= CALIB_IL_TX_ATTEN_GR2_LCH)
                return CALIB_CH_GROUP_2;

        if (channel >= CALIB_IL_TX_ATTEN_GR3_FCH &&
            channel <= CALIB_IL_TX_ATTEN_GR3_LCH)
                return CALIB_CH_GROUP_3;

        if (channel >= CALIB_IL_TX_ATTEN_GR4_FCH &&
            channel <= CALIB_IL_TX_ATTEN_GR4_LCH)
                return CALIB_CH_GROUP_4;

        return -EINVAL;
}

static u32
il4965_get_sub_band(const struct il_priv *il, u32 channel)
{
        s32 b = -1;

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

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

        return b;
}

static s32
il4965_interpolate_value(s32 x, s32 x1, s32 y1, s32 x2, s32 y2)
{
        s32 val;

        if (x2 == x1)
                return y1;
        else {
                il4965_math_div_round((x2 - x) * (y1 - y2), (x2 - x1), &val);
                return val + y2;
        }
}

/**
 * il4965_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
il4965_interpolate_chan(struct il_priv *il, u32 channel,
                        struct il_eeprom_calib_ch_info *chan_info)
{
        s32 s = -1;
        u32 c;
        u32 m;
        const struct il_eeprom_calib_measure *m1;
        const struct il_eeprom_calib_measure *m2;
        struct il_eeprom_calib_measure *omeas;
        u32 ch_i1;
        u32 ch_i2;

        s = il4965_get_sub_band(il, channel);
        if (s >= EEPROM_TX_POWER_BANDS) {
                IL_ERR("Tx Power can not find channel %d\n", channel);
                return -1;
        }

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

        D_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 = &(il->calib_info->band_info[s].ch1.
                               measurements[c][m]);
                        m2 = &(il->calib_info->band_info[s].ch2.
                               measurements[c][m]);
                        omeas = &(chan_info->measurements[c][m]);

                        omeas->actual_pow =
                            (u8) il4965_interpolate_value(channel, ch_i1,
                                                          m1->actual_pow, ch_i2,
                                                          m2->actual_pow);
                        omeas->gain_idx =
                            (u8) il4965_interpolate_value(channel, ch_i1,
                                                          m1->gain_idx, ch_i2,
                                                          m2->gain_idx);
                        omeas->temperature =
                            (u8) il4965_interpolate_value(channel, ch_i1,
                                                          m1->temperature,
                                                          ch_i2,
                                                          m2->temperature);
                        omeas->pa_det =
                            (s8) il4965_interpolate_value(channel, ch_i1,
                                                          m1->pa_det, ch_i2,
                                                          m2->pa_det);

                        D_TXPOWER("chain %d meas %d AP1=%d AP2=%d AP=%d\n", c,
                                  m, m1->actual_pow, m2->actual_pow,
                                  omeas->actual_pow);
                        D_TXPOWER("chain %d meas %d NI1=%d NI2=%d NI=%d\n", c,
                                  m, m1->gain_idx, m2->gain_idx,
                                  omeas->gain_idx);
                        D_TXPOWER("chain %d meas %d PA1=%d PA2=%d PA=%d\n", c,
                                  m, m1->pa_det, m2->pa_det, omeas->pa_det);
                        D_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 il4965_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_idx(s32 rate_power_idx, u32 band)
{
        if (!band) {
                if ((rate_power_idx & 7) <= 4)
                        return MIN_TX_GAIN_IDX_52GHZ_EXT;
        }
        return MIN_TX_GAIN_IDX;
}

struct gain_entry {
        u8 dsp;
        u8 radio;
};

static const struct gain_entry gain_table[2][108] = {
        /* 5.2GHz power gain idx 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 idx 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
il4965_fill_txpower_tbl(struct il_priv *il, u8 band, u16 channel, u8 is_ht40,
                        u8 ctrl_chan_high,
                        struct il4965_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 il_channel_info *ch_info = NULL;
        struct il_eeprom_calib_ch_info ch_eeprom_info;
        const struct il_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_idx[2];
        s32 factory_actual_pwr[2];
        s32 power_idx;

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

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

        ch_info = il_get_channel_info(il, il->band, channel);

        if (!il_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 = il4965_get_tx_atten_grp(channel);
        if (txatten_grp < 0) {
                IL_ERR("Can't find txatten group for channel %d.\n", channel);
                return txatten_grp;
        }

        D_TXPOWER("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 = il->calib_info->saturation_power24;
        else
                saturation_power = il->calib_info->saturation_power52;

        if (saturation_power < IL_TX_POWER_SATURATION_MIN ||
            saturation_power > IL_TX_POWER_SATURATION_MAX) {
                if (band)
                        saturation_power = IL_TX_POWER_DEFAULT_SATURATION_24;
                else
                        saturation_power = IL_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 < IL_TX_POWER_REGULATORY_MIN) ||
            (reg_limit > IL_TX_POWER_REGULATORY_MAX)) {
                if (band)
                        reg_limit = IL_TX_POWER_DEFAULT_REGULATORY_24;
                else
                        reg_limit = IL_TX_POWER_DEFAULT_REGULATORY_52;
        }

        /* Interpolate txpower calibration values for this channel,
         *   based on factory calibration tests on spaced channels. */
        il4965_interpolate_chan(il, channel, &ch_eeprom_info);

        /* calculate tx gain adjustment based on power supply voltage */
        voltage = le16_to_cpu(il->calib_info->voltage);
        init_voltage = (s32) le32_to_cpu(il->card_alive_init.voltage);
        voltage_compensation =
            il4965_get_voltage_compensation(voltage, init_voltage);

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

        /* get current temperature (Celsius) */
        current_temp = max(il->temperature, IL_TX_POWER_TEMPERATURE_MIN);
        current_temp = min(il->temperature, IL_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;
                il4965_math_div_round((current_temp -
                                       factory_temp) * degrees_per_05db_denom,
                                      degrees_per_05db_num,
                                      &temperature_comp[c]);

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

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

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

        /* for each of 33 bit-rates (including 1 for CCK) */
        for (i = 0; i < POWER_TBL_NUM_ENTRIES; i++) {
                u8 is_mimo_rate;
                union il4965_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 -
                            IL_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;

                D_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(il->card_alive_init.
                                                      tx_atten[txatten_grp][c]);
                        else
                                atten_value = 0;

                        /* calculate idx; higher idx means lower txpower */
                        power_idx =
                            (u8) (factory_gain_idx[c] -
                                  (target_power - factory_actual_pwr[c]) -
                                  temperature_comp[c] - voltage_compensation +
                                  atten_value);

/*                      D_TXPOWER("calculated txpower idx %d\n",
                                                power_idx); */

                        if (power_idx < get_min_power_idx(i, band))
                                power_idx = get_min_power_idx(i, band);

                        /* adjust 5 GHz idx to support negative idxes */
                        if (!band)
                                power_idx += 9;

                        /* CCK, rate 32, reduce txpower for CCK */
                        if (i == POWER_TBL_CCK_ENTRY)
                                power_idx +=
                                    IL_TX_POWER_CCK_COMPENSATION_C_STEP;

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

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

                        D_TXPOWER("chain %d mimo %d idx %d "
                                  "gain 0x%02x dsp %d\n", c, atten_value,
                                  power_idx, 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;
}

/**
 * il4965_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 il->tx_power_user_lmt.
 */
static int
il4965_send_tx_power(struct il_priv *il)
{
        struct il4965_txpowertable_cmd cmd = { 0 };
        int ret;
        u8 band = 0;
        bool is_ht40 = false;
        u8 ctrl_chan_high = 0;

        if (WARN_ONCE
            (test_bit(S_SCAN_HW, &il->status),
             "TX Power requested while scanning!\n"))
                return -EAGAIN;

        band = il->band == IEEE80211_BAND_2GHZ;

        is_ht40 = iw4965_is_ht40_channel(il->active.flags);

        if (is_ht40 && (il->active.flags & RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK))
                ctrl_chan_high = 1;

        cmd.band = band;
        cmd.channel = il->active.channel;

        ret =
            il4965_fill_txpower_tbl(il, band, le16_to_cpu(il->active.channel),
                                    is_ht40, ctrl_chan_high, &cmd.tx_power);
        if (ret)
                goto out;

        ret = il_send_cmd_pdu(il, C_TX_PWR_TBL, sizeof(cmd), &cmd);

out:
        return ret;
}

static int
il4965_send_rxon_assoc(struct il_priv *il)
{
        int ret = 0;
        struct il4965_rxon_assoc_cmd rxon_assoc;
        const struct il_rxon_cmd *rxon1 = &il->staging;
        const struct il_rxon_cmd *rxon2 = &il->active;

        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) {
                D_INFO("Using current RXON_ASSOC.  Not resending.\n");
                return 0;
        }

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

        ret =
            il_send_cmd_pdu_async(il, C_RXON_ASSOC, sizeof(rxon_assoc),
                                  &rxon_assoc, NULL);

        return ret;
}

static int
il4965_commit_rxon(struct il_priv *il)
{
        /* cast away the const for active_rxon in this function */
        struct il_rxon_cmd *active_rxon = (void *)&il->active;
        int ret;
        bool new_assoc = !!(il->staging.filter_flags & RXON_FILTER_ASSOC_MSK);

        if (!il_is_alive(il))
                return -EBUSY;

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

        ret = il_check_rxon_cmd(il);
        if (ret) {
                IL_ERR("Invalid RXON configuration.  Not committing.\n");
                return -EINVAL;
        }

        /*
         * receive commit_rxon request
         * abort any previous channel switch if still in process
         */
        if (test_bit(S_CHANNEL_SWITCH_PENDING, &il->status) &&
            il->switch_channel != il->staging.channel) {
                D_11H("abort channel switch on %d\n",
                      le16_to_cpu(il->switch_channel));
                il_chswitch_done(il, false);
        }

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

                memcpy(active_rxon, &il->staging, sizeof(*active_rxon));
                il_print_rx_config_cmd(il);
                /*
                 * We do not commit tx power settings while channel changing,
                 * do it now if tx power changed.
                 */
                il_set_tx_power(il, il->tx_power_next, false);
                return 0;
        }

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

                ret =
                    il_send_cmd_pdu(il, C_RXON,
                                    sizeof(struct il_rxon_cmd), active_rxon);

                /* If the mask clearing failed then we set
                 * active_rxon back to what it was previously */
                if (ret) {
                        active_rxon->filter_flags |= RXON_FILTER_ASSOC_MSK;
                        IL_ERR("Error clearing ASSOC_MSK (%d)\n", ret);
                        return ret;
                }
                il_clear_ucode_stations(il);
                il_restore_stations(il);
                ret = il4965_restore_default_wep_keys(il);
                if (ret) {
                        IL_ERR("Failed to restore WEP keys (%d)\n", ret);
                        return ret;
                }
        }

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

        il_set_rxon_hwcrypto(il, !il->cfg->mod_params->sw_crypto);

        /* Apply the new configuration
         * RXON unassoc clears the station table in uCode so restoration of
         * stations is needed after it (the RXON command) completes
         */
        if (!new_assoc) {
                ret =
                    il_send_cmd_pdu(il, C_RXON,
                                    sizeof(struct il_rxon_cmd), &il->staging);
                if (ret) {
                        IL_ERR("Error setting new RXON (%d)\n", ret);
                        return ret;
                }
                D_INFO("Return from !new_assoc RXON.\n");
                memcpy(active_rxon, &il->staging, sizeof(*active_rxon));
                il_clear_ucode_stations(il);
                il_restore_stations(il);
                ret = il4965_restore_default_wep_keys(il);
                if (ret) {
                        IL_ERR("Failed to restore WEP keys (%d)\n", ret);
                        return ret;
                }
        }
        if (new_assoc) {
                il->start_calib = 0;
                /* Apply the new configuration
                 * RXON assoc doesn't clear the station table in uCode,
                 */
                ret =
                    il_send_cmd_pdu(il, C_RXON,
                                    sizeof(struct il_rxon_cmd), &il->staging);
                if (ret) {
                        IL_ERR("Error setting new RXON (%d)\n", ret);
                        return ret;
                }
                memcpy(active_rxon, &il->staging, sizeof(*active_rxon));
        }
        il_print_rx_config_cmd(il);

        il4965_init_sensitivity(il);

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

        return 0;
}

static int
il4965_hw_channel_switch(struct il_priv *il,
                         struct ieee80211_channel_switch *ch_switch)
{
        int rc;
        u8 band = 0;
        bool is_ht40 = false;
        u8 ctrl_chan_high = 0;
        struct il4965_channel_switch_cmd cmd;
        const struct il_channel_info *ch_info;
        u32 switch_time_in_usec, ucode_switch_time;
        u16 ch;
        u32 tsf_low;
        u8 switch_count;
        u16 beacon_interval = le16_to_cpu(il->timing.beacon_interval);
        struct ieee80211_vif *vif = il->vif;
        band = (il->band == IEEE80211_BAND_2GHZ);

        if (WARN_ON_ONCE(vif == NULL))
                return -EIO;

        is_ht40 = iw4965_is_ht40_channel(il->staging.flags);

        if (is_ht40 && (il->staging.flags & RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK))
                ctrl_chan_high = 1;

        cmd.band = band;
        cmd.expect_beacon = 0;
        ch = ch_switch->chandef.chan->hw_value;
        cmd.channel = cpu_to_le16(ch);
        cmd.rxon_flags = il->staging.flags;
        cmd.rxon_filter_flags = il->staging.filter_flags;
        switch_count = ch_switch->count;
        tsf_low = ch_switch->timestamp & 0x0ffffffff;
        /*
         * calculate the ucode channel switch time
         * adding TSF as one of the factor for when to switch
         */
        if (il->ucode_beacon_time > tsf_low && beacon_interval) {
                if (switch_count >
                    ((il->ucode_beacon_time - tsf_low) / beacon_interval)) {
                        switch_count -=
                            (il->ucode_beacon_time - tsf_low) / beacon_interval;
                } else
                        switch_count = 0;
        }
        if (switch_count <= 1)
                cmd.switch_time = cpu_to_le32(il->ucode_beacon_time);
        else {
                switch_time_in_usec =
                    vif->bss_conf.beacon_int * switch_count * TIME_UNIT;
                ucode_switch_time =
                    il_usecs_to_beacons(il, switch_time_in_usec,
                                        beacon_interval);
                cmd.switch_time =
                    il_add_beacon_time(il, il->ucode_beacon_time,
                                       ucode_switch_time, beacon_interval);
        }
        D_11H("uCode time for the switch is 0x%x\n", cmd.switch_time);
        ch_info = il_get_channel_info(il, il->band, ch);
        if (ch_info)
                cmd.expect_beacon = il_is_channel_radar(ch_info);
        else {
                IL_ERR("invalid channel switch from %u to %u\n",
                       il->active.channel, ch);
                return -EFAULT;
        }

        rc = il4965_fill_txpower_tbl(il, band, ch, is_ht40, ctrl_chan_high,
                                     &cmd.tx_power);
        if (rc) {
                D_11H("error:%d  fill txpower_tbl\n", rc);
                return rc;
        }

        return il_send_cmd_pdu(il, C_CHANNEL_SWITCH, sizeof(cmd), &cmd);
}

/**
 * il4965_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
 */
static void
il4965_txq_update_byte_cnt_tbl(struct il_priv *il, struct il_tx_queue *txq,
                               u16 byte_cnt)
{
        struct il4965_scd_bc_tbl *scd_bc_tbl = il->scd_bc_tbls.addr;
        int txq_id = txq->q.id;
        int write_ptr = txq->q.write_ptr;
        int len = byte_cnt + IL_TX_CRC_SIZE + IL_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;
}

/**
 * il4965_hw_get_temperature - return the calibrated temperature (in Kelvin)
 * @stats: Provides the temperature reading from the uCode
 *
 * A return of <0 indicates bogus data in the stats
 */
static int
il4965_hw_get_temperature(struct il_priv *il)
{
        s32 temperature;
        s32 vt;
        s32 R1, R2, R3;
        u32 R4;

        if (test_bit(S_TEMPERATURE, &il->status) &&
            (il->_4965.stats.flag & STATS_REPLY_FLG_HT40_MODE_MSK)) {
                D_TEMP("Running HT40 temperature calibration\n");
                R1 = (s32) le32_to_cpu(il->card_alive_init.therm_r1[1]);
                R2 = (s32) le32_to_cpu(il->card_alive_init.therm_r2[1]);
                R3 = (s32) le32_to_cpu(il->card_alive_init.therm_r3[1]);
                R4 = le32_to_cpu(il->card_alive_init.therm_r4[1]);
        } else {
                D_TEMP("Running temperature calibration\n");
                R1 = (s32) le32_to_cpu(il->card_alive_init.therm_r1[0]);
                R2 = (s32) le32_to_cpu(il->card_alive_init.therm_r2[0]);
                R3 = (s32) le32_to_cpu(il->card_alive_init.therm_r3[0]);
                R4 = le32_to_cpu(il->card_alive_init.therm_r4[0]);
        }

        /*
         * Temperature is only 23 bits, so sign extend out to 32.
         *
         * NOTE If we haven't received a stats notification yet
         * with an updated temperature, use R4 provided to us in the
         * "initialize" ALIVE response.
         */
        if (!test_bit(S_TEMPERATURE, &il->status))
                vt = sign_extend32(R4, 23);
        else
                vt = sign_extend32(le32_to_cpu
                                   (il->_4965.stats.general.common.temperature),
                                   23);

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

        if (R3 == R1) {
                IL_ERR("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;

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

        return temperature;
}

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

/**
 * il4965_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 il->last_temperature once calibration
 * executed.
 */
static int
il4965_is_temp_calib_needed(struct il_priv *il)
{
        int temp_diff;

        if (!test_bit(S_STATS, &il->status)) {
                D_TEMP("Temperature not updated -- no stats.\n");
                return 0;
        }

        temp_diff = il->temperature - il->last_temperature;

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

        if (temp_diff < IL_TEMPERATURE_THRESHOLD) {
                D_POWER(" => thermal txpower calib not needed\n");
                return 0;
        }

        D_POWER(" => thermal txpower calib needed\n");

        return 1;
}

void
il4965_temperature_calib(struct il_priv *il)
{
        s32 temp;

        temp = il4965_hw_get_temperature(il);
        if (IL_TX_POWER_TEMPERATURE_OUT_OF_RANGE(temp))
                return;

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

        il->temperature = temp;
        set_bit(S_TEMPERATURE, &il->status);

        if (!il->disable_tx_power_cal &&
            unlikely(!test_bit(S_SCANNING, &il->status)) &&
            il4965_is_temp_calib_needed(il))
                queue_work(il->workqueue, &il->txpower_work);
}

static u16
il4965_get_hcmd_size(u8 cmd_id, u16 len)
{
        switch (cmd_id) {
        case C_RXON:
                return (u16) sizeof(struct il4965_rxon_cmd);
        default:
                return len;
        }
}

static u16
il4965_build_addsta_hcmd(const struct il_addsta_cmd *cmd, u8 * data)
{
        struct il4965_addsta_cmd *addsta = (struct il4965_addsta_cmd *)data;
        addsta->mode = cmd->mode;
        memcpy(&addsta->sta, &cmd->sta, sizeof(struct sta_id_modify));
        memcpy(&addsta->key, &cmd->key, sizeof(struct il4965_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->sleep_tx_count = cmd->sleep_tx_count;
        addsta->reserved1 = cpu_to_le16(0);
        addsta->reserved2 = cpu_to_le16(0);

        return (u16) sizeof(struct il4965_addsta_cmd);
}

static void
il4965_post_scan(struct il_priv *il)
{
        /*
         * Since setting the RXON may have been deferred while
         * performing the scan, fire one off if needed
         */
        if (memcmp(&il->staging, &il->active, sizeof(il->staging)))
                il_commit_rxon(il);
}

static void
il4965_post_associate(struct il_priv *il)
{
        struct ieee80211_vif *vif = il->vif;
        int ret = 0;

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

        if (test_bit(S_EXIT_PENDING, &il->status))
                return;

        il_scan_cancel_timeout(il, 200);

        il->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
        il_commit_rxon(il);

        ret = il_send_rxon_timing(il);
        if (ret)
                IL_WARN("RXON timing - " "Attempting to continue.\n");

        il->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;

        il_set_rxon_ht(il, &il->current_ht_config);

        if (il->ops->set_rxon_chain)
                il->ops->set_rxon_chain(il);

        il->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);

        D_ASSOC("assoc id %d beacon interval %d\n", vif->bss_conf.aid,
                vif->bss_conf.beacon_int);

        if (vif->bss_conf.use_short_preamble)
                il->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
        else
                il->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;

        if (il->staging.flags & RXON_FLG_BAND_24G_MSK) {
                if (vif->bss_conf.use_short_slot)
                        il->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
                else
                        il->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
        }

        il_commit_rxon(il);

        D_ASSOC("Associated as %d to: %pM\n", vif->bss_conf.aid,
                il->active.bssid_addr);

        switch (vif->type) {
        case NL80211_IFTYPE_STATION:
                break;
        case NL80211_IFTYPE_ADHOC:
                il4965_send_beacon_cmd(il);
                break;
        default:
                IL_ERR("%s Should not be called in %d mode\n", __func__,
                       vif->type);
                break;
        }

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

        /* Enable Rx differential gain and sensitivity calibrations */
        il4965_chain_noise_reset(il);
        il->start_calib = 1;
}

static void
il4965_config_ap(struct il_priv *il)
{
        struct ieee80211_vif *vif = il->vif;
        int ret = 0;

        lockdep_assert_held(&il->mutex);

        if (test_bit(S_EXIT_PENDING, &il->status))
                return;

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

                /* RXON - unassoc (to set timing command) */
                il->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
                il_commit_rxon(il);

                /* RXON Timing */
                ret = il_send_rxon_timing(il);
                if (ret)
                        IL_WARN("RXON timing failed - "
                                "Attempting to continue.\n");

                /* AP has all antennas */
                il->chain_noise_data.active_chains = il->hw_params.valid_rx_ant;
                il_set_rxon_ht(il, &il->current_ht_config);
                if (il->ops->set_rxon_chain)
                        il->ops->set_rxon_chain(il);

                il->staging.assoc_id = 0;

                if (vif->bss_conf.use_short_preamble)
                        il->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
                else
                        il->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;

                if (il->staging.flags & RXON_FLG_BAND_24G_MSK) {
                        if (vif->bss_conf.use_short_slot)
                                il->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
                        else
                                il->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
                }
                /* need to send beacon cmd before committing assoc RXON! */
                il4965_send_beacon_cmd(il);
                /* restore RXON assoc */
                il->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
                il_commit_rxon(il);
        }
        il4965_send_beacon_cmd(il);
}

const struct il_ops il4965_ops = {
        .txq_update_byte_cnt_tbl = il4965_txq_update_byte_cnt_tbl,
        .txq_attach_buf_to_tfd = il4965_hw_txq_attach_buf_to_tfd,
        .txq_free_tfd = il4965_hw_txq_free_tfd,
        .txq_init = il4965_hw_tx_queue_init,
        .is_valid_rtc_data_addr = il4965_hw_valid_rtc_data_addr,
        .init_alive_start = il4965_init_alive_start,
        .load_ucode = il4965_load_bsm,
        .dump_nic_error_log = il4965_dump_nic_error_log,
        .dump_fh = il4965_dump_fh,
        .set_channel_switch = il4965_hw_channel_switch,
        .apm_init = il_apm_init,
        .send_tx_power = il4965_send_tx_power,
        .update_chain_flags = il4965_update_chain_flags,
        .eeprom_acquire_semaphore = il4965_eeprom_acquire_semaphore,
        .eeprom_release_semaphore = il4965_eeprom_release_semaphore,

        .rxon_assoc = il4965_send_rxon_assoc,
        .commit_rxon = il4965_commit_rxon,
        .set_rxon_chain = il4965_set_rxon_chain,

        .get_hcmd_size = il4965_get_hcmd_size,
        .build_addsta_hcmd = il4965_build_addsta_hcmd,
        .request_scan = il4965_request_scan,
        .post_scan = il4965_post_scan,

        .post_associate = il4965_post_associate,
        .config_ap = il4965_config_ap,
        .manage_ibss_station = il4965_manage_ibss_station,
        .update_bcast_stations = il4965_update_bcast_stations,

        .send_led_cmd = il4965_send_led_cmd,
};

struct il_cfg il4965_cfg = {
        .name = "Intel(R) Wireless WiFi Link 4965AGN",
        .fw_name_pre = IL4965_FW_PRE,
        .ucode_api_max = IL4965_UCODE_API_MAX,
        .ucode_api_min = IL4965_UCODE_API_MIN,
        .sku = IL_SKU_A | IL_SKU_G | IL_SKU_N,
        .valid_tx_ant = ANT_AB,
        .valid_rx_ant = ANT_ABC,
        .eeprom_ver = EEPROM_4965_EEPROM_VERSION,
        .eeprom_calib_ver = EEPROM_4965_TX_POWER_VERSION,
        .mod_params = &il4965_mod_params,
        .led_mode = IL_LED_BLINK,
        /*
         * Force use of chains B and C for scan RX on 5 GHz band
         * because the device has off-channel reception on chain A.
         */
        .scan_rx_antennas[IEEE80211_BAND_5GHZ] = ANT_BC,

        .eeprom_size = IL4965_EEPROM_IMG_SIZE,
        .num_of_queues = IL49_NUM_QUEUES,
        .num_of_ampdu_queues = IL49_NUM_AMPDU_QUEUES,
        .pll_cfg_val = 0,
        .set_l0s = true,
        .use_bsm = true,
        .led_compensation = 61,
        .chain_noise_num_beacons = IL4965_CAL_NUM_BEACONS,
        .wd_timeout = IL_DEF_WD_TIMEOUT,
        .temperature_kelvin = true,
        .ucode_tracing = true,
        .sensitivity_calib_by_driver = true,
        .chain_noise_calib_by_driver = true,

        .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
        },

};

/* Module firmware */
MODULE_FIRMWARE(IL4965_MODULE_FIRMWARE(IL4965_UCODE_API_MAX));