Merge branch 'linux-2.6'

[linux-2.6] / drivers / net / wireless / iwlwifi / iwl-4965-commands.h

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2005 - 2007 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * Contact Information:
 * James P. Ketrenos <ipw2100-admin@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2005 - 2007 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/
/*
 * Please use this file (iwl-4965-commands.h) only for uCode API definitions.
 * Please use iwl-4965-hw.h for hardware-related definitions.
 * Please use iwl-4965.h for driver implementation definitions.
 */

#ifndef __iwl4965_commands_h__
#define __iwl4965_commands_h__

enum {
        REPLY_ALIVE = 0x1,
        REPLY_ERROR = 0x2,

        /* RXON and QOS commands */
        REPLY_RXON = 0x10,
        REPLY_RXON_ASSOC = 0x11,
        REPLY_QOS_PARAM = 0x13,
        REPLY_RXON_TIMING = 0x14,

        /* Multi-Station support */
        REPLY_ADD_STA = 0x18,
        REPLY_REMOVE_STA = 0x19,        /* not used */
        REPLY_REMOVE_ALL_STA = 0x1a,    /* not used */

        /* RX, TX, LEDs */
        REPLY_TX = 0x1c,
        REPLY_RATE_SCALE = 0x47,        /* 3945 only */
        REPLY_LEDS_CMD = 0x48,
        REPLY_TX_LINK_QUALITY_CMD = 0x4e, /* 4965 only */

        /* 802.11h related */
        RADAR_NOTIFICATION = 0x70,      /* not used */
        REPLY_QUIET_CMD = 0x71,         /* not used */
        REPLY_CHANNEL_SWITCH = 0x72,
        CHANNEL_SWITCH_NOTIFICATION = 0x73,
        REPLY_SPECTRUM_MEASUREMENT_CMD = 0x74,
        SPECTRUM_MEASURE_NOTIFICATION = 0x75,

        /* Power Management */
        POWER_TABLE_CMD = 0x77,
        PM_SLEEP_NOTIFICATION = 0x7A,
        PM_DEBUG_STATISTIC_NOTIFIC = 0x7B,

        /* Scan commands and notifications */
        REPLY_SCAN_CMD = 0x80,
        REPLY_SCAN_ABORT_CMD = 0x81,
        SCAN_START_NOTIFICATION = 0x82,
        SCAN_RESULTS_NOTIFICATION = 0x83,
        SCAN_COMPLETE_NOTIFICATION = 0x84,

        /* IBSS/AP commands */
        BEACON_NOTIFICATION = 0x90,
        REPLY_TX_BEACON = 0x91,
        WHO_IS_AWAKE_NOTIFICATION = 0x94,       /* not used */

        /* Miscellaneous commands */
        QUIET_NOTIFICATION = 0x96,              /* not used */
        REPLY_TX_PWR_TABLE_CMD = 0x97,
        MEASURE_ABORT_NOTIFICATION = 0x99,      /* not used */

        /* Bluetooth device coexistance config command */
        REPLY_BT_CONFIG = 0x9b,

        /* Statistics */
        REPLY_STATISTICS_CMD = 0x9c,
        STATISTICS_NOTIFICATION = 0x9d,

        /* RF-KILL commands and notifications */
        REPLY_CARD_STATE_CMD = 0xa0,
        CARD_STATE_NOTIFICATION = 0xa1,

        /* Missed beacons notification */
        MISSED_BEACONS_NOTIFICATION = 0xa2,

        REPLY_CT_KILL_CONFIG_CMD = 0xa4,
        SENSITIVITY_CMD = 0xa8,
        REPLY_PHY_CALIBRATION_CMD = 0xb0,
        REPLY_RX_PHY_CMD = 0xc0,
        REPLY_RX_MPDU_CMD = 0xc1,
        REPLY_4965_RX = 0xc3,
        REPLY_COMPRESSED_BA = 0xc5,
        REPLY_MAX = 0xff
};

/******************************************************************************
 * (0)
 * Commonly used structures and definitions:
 * Command header, rate_n_flags, txpower
 *
 *****************************************************************************/

/* iwl4965_cmd_header flags value */
#define IWL_CMD_FAILED_MSK 0x40

/**
 * struct iwl4965_cmd_header
 *
 * This header format appears in the beginning of each command sent from the
 * driver, and each response/notification received from uCode.
 */
struct iwl4965_cmd_header {
        u8 cmd;         /* Command ID:  REPLY_RXON, etc. */
        u8 flags;       /* IWL_CMD_* */
        /*
         * The driver sets up the sequence number to values of its chosing.
         * uCode does not use this value, but passes it back to the driver
         * when sending the response to each driver-originated command, so
         * the driver can match the response to the command.  Since the values
         * don't get used by uCode, the driver may set up an arbitrary format.
         *
         * There is one exception:  uCode sets bit 15 when it originates
         * the response/notification, i.e. when the response/notification
         * is not a direct response to a command sent by the driver.  For
         * example, uCode issues REPLY_3945_RX when it sends a received frame
         * to the driver; it is not a direct response to any driver command.
         *
         * The Linux driver uses the following format:
         *
         *  0:7    index/position within Tx queue
         *  8:13   Tx queue selection
         * 14:14   driver sets this to indicate command is in the 'huge'
         *         storage at the end of the command buffers, i.e. scan cmd
         * 15:15   uCode sets this in uCode-originated response/notification
         */
        __le16 sequence;

        /* command or response/notification data follows immediately */
        u8 data[0];
} __attribute__ ((packed));

/**
 * 4965 rate_n_flags bit fields
 *
 * rate_n_flags format is used in following 4965 commands:
 *  REPLY_4965_RX (response only)
 *  REPLY_TX (both command and response)
 *  REPLY_TX_LINK_QUALITY_CMD
 *
 * High-throughput (HT) rate format for bits 7:0 (bit 8 must be "1"):
 *  2-0:  0)   6 Mbps
 *        1)  12 Mbps
 *        2)  18 Mbps
 *        3)  24 Mbps
 *        4)  36 Mbps
 *        5)  48 Mbps
 *        6)  54 Mbps
 *        7)  60 Mbps
 *
 *    3:  0)  Single stream (SISO)
 *        1)  Dual stream (MIMO)
 *
 *    5:  Value of 0x20 in bits 7:0 indicates 6 Mbps FAT duplicate data
 *
 * Legacy OFDM rate format for bits 7:0 (bit 8 must be "0", bit 9 "0"):
 *  3-0:  0xD)   6 Mbps
 *        0xF)   9 Mbps
 *        0x5)  12 Mbps
 *        0x7)  18 Mbps
 *        0x9)  24 Mbps
 *        0xB)  36 Mbps
 *        0x1)  48 Mbps
 *        0x3)  54 Mbps
 *
 * Legacy CCK rate format for bits 7:0 (bit 8 must be "0", bit 9 "1"):
 *  3-0:   10)  1 Mbps
 *         20)  2 Mbps
 *         55)  5.5 Mbps
 *        110)  11 Mbps
 */
#define RATE_MCS_CODE_MSK 0x7
#define RATE_MCS_MIMO_POS 3
#define RATE_MCS_MIMO_MSK 0x8
#define RATE_MCS_HT_DUP_POS 5
#define RATE_MCS_HT_DUP_MSK 0x20

/* Bit 8: (1) HT format, (0) legacy format in bits 7:0 */
#define RATE_MCS_FLAGS_POS 8
#define RATE_MCS_HT_POS 8
#define RATE_MCS_HT_MSK 0x100

/* Bit 9: (1) CCK, (0) OFDM.  HT (bit 8) must be "0" for this bit to be valid */
#define RATE_MCS_CCK_POS 9
#define RATE_MCS_CCK_MSK 0x200

/* Bit 10: (1) Use Green Field preamble */
#define RATE_MCS_GF_POS 10
#define RATE_MCS_GF_MSK 0x400

/* Bit 11: (1) Use 40Mhz FAT chnl width, (0) use 20 MHz legacy chnl width */
#define RATE_MCS_FAT_POS 11
#define RATE_MCS_FAT_MSK 0x800

/* Bit 12: (1) Duplicate data on both 20MHz chnls.  FAT (bit 11) must be set. */
#define RATE_MCS_DUP_POS 12
#define RATE_MCS_DUP_MSK 0x1000

/* Bit 13: (1) Short guard interval (0.4 usec), (0) normal GI (0.8 usec) */
#define RATE_MCS_SGI_POS 13
#define RATE_MCS_SGI_MSK 0x2000

/**
 * rate_n_flags Tx antenna masks (4965 has 2 transmitters):
 * bit14:15 01 B inactive, A active
 *          10 B active, A inactive
 *          11 Both active
 */
#define RATE_MCS_ANT_A_POS      14
#define RATE_MCS_ANT_B_POS      15
#define RATE_MCS_ANT_A_MSK      0x4000
#define RATE_MCS_ANT_B_MSK      0x8000
#define RATE_MCS_ANT_AB_MSK     0xc000


/**
 * struct iwl4965_tx_power - txpower format used in REPLY_SCAN_CMD
 *
 * Scan uses only one transmitter, so only one analog/dsp gain pair is needed.
 */
struct iwl4965_tx_power {
        u8 tx_gain;             /* gain for analog radio */
        u8 dsp_atten;           /* gain for DSP */
} __attribute__ ((packed));

#define POWER_TABLE_NUM_ENTRIES                 33
#define POWER_TABLE_NUM_HT_OFDM_ENTRIES         32
#define POWER_TABLE_CCK_ENTRY                   32

/**
 * union iwl4965_tx_power_dual_stream
 *
 * Host format used for REPLY_TX_PWR_TABLE_CMD, REPLY_CHANNEL_SWITCH
 * Use __le32 version (struct tx_power_dual_stream) when building command.
 *
 * Driver provides radio gain and DSP attenuation settings to device in pairs,
 * one value for each transmitter chain.  The first value is for transmitter A,
 * second for transmitter B.
 *
 * For SISO bit rates, both values in a pair should be identical.
 * For MIMO rates, one value may be different from the other,
 * in order to balance the Tx output between the two transmitters.
 *
 * See more details in doc for TXPOWER in iwl-4965-hw.h.
 */
union iwl4965_tx_power_dual_stream {
        struct {
                u8 radio_tx_gain[2];
                u8 dsp_predis_atten[2];
        } s;
        u32 dw;
};

/**
 * struct tx_power_dual_stream
 *
 * Table entries in REPLY_TX_PWR_TABLE_CMD, REPLY_CHANNEL_SWITCH
 *
 * Same format as iwl_tx_power_dual_stream, but __le32
 */
struct tx_power_dual_stream {
        __le32 dw;
} __attribute__ ((packed));

/**
 * struct iwl4965_tx_power_db
 *
 * Entire table within REPLY_TX_PWR_TABLE_CMD, REPLY_CHANNEL_SWITCH
 */
struct iwl4965_tx_power_db {
        struct tx_power_dual_stream power_tbl[POWER_TABLE_NUM_ENTRIES];
} __attribute__ ((packed));


/******************************************************************************
 * (0a)
 * Alive and Error Commands & Responses:
 *
 *****************************************************************************/

#define UCODE_VALID_OK  __constant_cpu_to_le32(0x1)
#define INITIALIZE_SUBTYPE    (9)

/*
 * ("Initialize") REPLY_ALIVE = 0x1 (response only, not a command)
 *
 * uCode issues this "initialize alive" notification once the initialization
 * uCode image has completed its work, and is ready to load the runtime image.
 * This is the *first* "alive" notification that the driver will receive after
 * rebooting uCode; the "initialize" alive is indicated by subtype field == 9.
 *
 * See comments documenting "BSM" (bootstrap state machine).
 *
 * For 4965, this notification contains important calibration data for
 * calculating txpower settings:
 *
 * 1)  Power supply voltage indication.  The voltage sensor outputs higher
 *     values for lower voltage, and vice versa.
 *
 * 2)  Temperature measurement parameters, for each of two channel widths
 *     (20 MHz and 40 MHz) supported by the radios.  Temperature sensing
 *     is done via one of the receiver chains, and channel width influences
 *     the results.
 *
 * 3)  Tx gain compensation to balance 4965's 2 Tx chains for MIMO operation,
 *     for each of 5 frequency ranges.
 */
struct iwl4965_init_alive_resp {
        u8 ucode_minor;
        u8 ucode_major;
        __le16 reserved1;
        u8 sw_rev[8];
        u8 ver_type;
        u8 ver_subtype;         /* "9" for initialize alive */
        __le16 reserved2;
        __le32 log_event_table_ptr;
        __le32 error_event_table_ptr;
        __le32 timestamp;
        __le32 is_valid;

        /* calibration values from "initialize" uCode */
        __le32 voltage;         /* signed, higher value is lower voltage */
        __le32 therm_r1[2];     /* signed, 1st for normal, 2nd for FAT channel*/
        __le32 therm_r2[2];     /* signed */
        __le32 therm_r3[2];     /* signed */
        __le32 therm_r4[2];     /* signed */
        __le32 tx_atten[5][2];  /* signed MIMO gain comp, 5 freq groups,
                                 * 2 Tx chains */
} __attribute__ ((packed));


/**
 * REPLY_ALIVE = 0x1 (response only, not a command)
 *
 * uCode issues this "alive" notification once the runtime image is ready
 * to receive commands from the driver.  This is the *second* "alive"
 * notification that the driver will receive after rebooting uCode;
 * this "alive" is indicated by subtype field != 9.
 *
 * See comments documenting "BSM" (bootstrap state machine).
 *
 * This response includes two pointers to structures within the device's
 * data SRAM (access via HBUS_TARG_MEM_* regs) that are useful for debugging:
 *
 * 1)  log_event_table_ptr indicates base of the event log.  This traces
 *     a 256-entry history of uCode execution within a circular buffer.
 *     Its header format is:
 *
 *      __le32 log_size;     log capacity (in number of entries)
 *      __le32 type;         (1) timestamp with each entry, (0) no timestamp
 *      __le32 wraps;        # times uCode has wrapped to top of circular buffer
 *      __le32 write_index;  next circular buffer entry that uCode would fill
 *
 *     The header is followed by the circular buffer of log entries.  Entries
 *     with timestamps have the following format:
 *
 *      __le32 event_id;     range 0 - 1500
 *      __le32 timestamp;    low 32 bits of TSF (of network, if associated)
 *      __le32 data;         event_id-specific data value
 *
 *     Entries without timestamps contain only event_id and data.
 *
 * 2)  error_event_table_ptr indicates base of the error log.  This contains
 *     information about any uCode error that occurs.  For 4965, the format
 *     of the error log is:
 *
 *      __le32 valid;        (nonzero) valid, (0) log is empty
 *      __le32 error_id;     type of error
 *      __le32 pc;           program counter
 *      __le32 blink1;       branch link
 *      __le32 blink2;       branch link
 *      __le32 ilink1;       interrupt link
 *      __le32 ilink2;       interrupt link
 *      __le32 data1;        error-specific data
 *      __le32 data2;        error-specific data
 *      __le32 line;         source code line of error
 *      __le32 bcon_time;    beacon timer
 *      __le32 tsf_low;      network timestamp function timer
 *      __le32 tsf_hi;       network timestamp function timer
 *
 * The Linux driver can print both logs to the system log when a uCode error
 * occurs.
 */
struct iwl4965_alive_resp {
        u8 ucode_minor;
        u8 ucode_major;
        __le16 reserved1;
        u8 sw_rev[8];
        u8 ver_type;
        u8 ver_subtype;                 /* not "9" for runtime alive */
        __le16 reserved2;
        __le32 log_event_table_ptr;     /* SRAM address for event log */
        __le32 error_event_table_ptr;   /* SRAM address for error log */
        __le32 timestamp;
        __le32 is_valid;
} __attribute__ ((packed));


union tsf {
        u8 byte[8];
        __le16 word[4];
        __le32 dw[2];
};

/*
 * REPLY_ERROR = 0x2 (response only, not a command)
 */
struct iwl4965_error_resp {
        __le32 error_type;
        u8 cmd_id;
        u8 reserved1;
        __le16 bad_cmd_seq_num;
        __le32 error_info;
        union tsf timestamp;
} __attribute__ ((packed));

/******************************************************************************
 * (1)
 * RXON Commands & Responses:
 *
 *****************************************************************************/

/*
 * Rx config defines & structure
 */
/* rx_config device types  */
enum {
        RXON_DEV_TYPE_AP = 1,
        RXON_DEV_TYPE_ESS = 3,
        RXON_DEV_TYPE_IBSS = 4,
        RXON_DEV_TYPE_SNIFFER = 6,
};


#define RXON_RX_CHAIN_DRIVER_FORCE_MSK          __constant_cpu_to_le16(0x1 << 0)
#define RXON_RX_CHAIN_VALID_MSK                 __constant_cpu_to_le16(0x7 << 1)
#define RXON_RX_CHAIN_VALID_POS                 (1)
#define RXON_RX_CHAIN_FORCE_SEL_MSK             __constant_cpu_to_le16(0x7 << 4)
#define RXON_RX_CHAIN_FORCE_SEL_POS             (4)
#define RXON_RX_CHAIN_FORCE_MIMO_SEL_MSK        __constant_cpu_to_le16(0x7 << 7)
#define RXON_RX_CHAIN_FORCE_MIMO_SEL_POS        (7)
#define RXON_RX_CHAIN_CNT_MSK                   __constant_cpu_to_le16(0x3 << 10)
#define RXON_RX_CHAIN_CNT_POS                   (10)
#define RXON_RX_CHAIN_MIMO_CNT_MSK              __constant_cpu_to_le16(0x3 << 12)
#define RXON_RX_CHAIN_MIMO_CNT_POS              (12)
#define RXON_RX_CHAIN_MIMO_FORCE_MSK            __constant_cpu_to_le16(0x1 << 14)
#define RXON_RX_CHAIN_MIMO_FORCE_POS            (14)

/* rx_config flags */
/* band & modulation selection */
#define RXON_FLG_BAND_24G_MSK           __constant_cpu_to_le32(1 << 0)
#define RXON_FLG_CCK_MSK                __constant_cpu_to_le32(1 << 1)
/* auto detection enable */
#define RXON_FLG_AUTO_DETECT_MSK        __constant_cpu_to_le32(1 << 2)
/* TGg protection when tx */
#define RXON_FLG_TGG_PROTECT_MSK        __constant_cpu_to_le32(1 << 3)
/* cck short slot & preamble */
#define RXON_FLG_SHORT_SLOT_MSK          __constant_cpu_to_le32(1 << 4)
#define RXON_FLG_SHORT_PREAMBLE_MSK     __constant_cpu_to_le32(1 << 5)
/* antenna selection */
#define RXON_FLG_DIS_DIV_MSK            __constant_cpu_to_le32(1 << 7)
#define RXON_FLG_ANT_SEL_MSK            __constant_cpu_to_le32(0x0f00)
#define RXON_FLG_ANT_A_MSK              __constant_cpu_to_le32(1 << 8)
#define RXON_FLG_ANT_B_MSK              __constant_cpu_to_le32(1 << 9)
/* radar detection enable */
#define RXON_FLG_RADAR_DETECT_MSK       __constant_cpu_to_le32(1 << 12)
#define RXON_FLG_TGJ_NARROW_BAND_MSK    __constant_cpu_to_le32(1 << 13)
/* rx response to host with 8-byte TSF
* (according to ON_AIR deassertion) */
#define RXON_FLG_TSF2HOST_MSK           __constant_cpu_to_le32(1 << 15)


/* HT flags */
#define RXON_FLG_CTRL_CHANNEL_LOC_POS           (22)
#define RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK        __constant_cpu_to_le32(0x1 << 22)

#define RXON_FLG_HT_OPERATING_MODE_POS          (23)

#define RXON_FLG_HT_PROT_MSK                    __constant_cpu_to_le32(0x1 << 23)
#define RXON_FLG_FAT_PROT_MSK                   __constant_cpu_to_le32(0x2 << 23)

#define RXON_FLG_CHANNEL_MODE_POS               (25)
#define RXON_FLG_CHANNEL_MODE_MSK               __constant_cpu_to_le32(0x3 << 25)
#define RXON_FLG_CHANNEL_MODE_PURE_40_MSK       __constant_cpu_to_le32(0x1 << 25)
#define RXON_FLG_CHANNEL_MODE_MIXED_MSK         __constant_cpu_to_le32(0x2 << 25)

/* rx_config filter flags */
/* accept all data frames */
#define RXON_FILTER_PROMISC_MSK         __constant_cpu_to_le32(1 << 0)
/* pass control & management to host */
#define RXON_FILTER_CTL2HOST_MSK        __constant_cpu_to_le32(1 << 1)
/* accept multi-cast */
#define RXON_FILTER_ACCEPT_GRP_MSK      __constant_cpu_to_le32(1 << 2)
/* don't decrypt uni-cast frames */
#define RXON_FILTER_DIS_DECRYPT_MSK     __constant_cpu_to_le32(1 << 3)
/* don't decrypt multi-cast frames */
#define RXON_FILTER_DIS_GRP_DECRYPT_MSK __constant_cpu_to_le32(1 << 4)
/* STA is associated */
#define RXON_FILTER_ASSOC_MSK           __constant_cpu_to_le32(1 << 5)
/* transfer to host non bssid beacons in associated state */
#define RXON_FILTER_BCON_AWARE_MSK      __constant_cpu_to_le32(1 << 6)

/**
 * REPLY_RXON = 0x10 (command, has simple generic response)
 *
 * RXON tunes the radio tuner to a service channel, and sets up a number
 * of parameters that are used primarily for Rx, but also for Tx operations.
 *
 * NOTE:  When tuning to a new channel, driver must set the
 *        RXON_FILTER_ASSOC_MSK to 0.  This will clear station-dependent
 *        info within the device, including the station tables, tx retry
 *        rate tables, and txpower tables.  Driver must build a new station
 *        table and txpower table before transmitting anything on the RXON
 *        channel.
 *
 * NOTE:  All RXONs wipe clean the internal txpower table.  Driver must
 *        issue a new REPLY_TX_PWR_TABLE_CMD after each REPLY_RXON (0x10),
 *        regardless of whether RXON_FILTER_ASSOC_MSK is set.
 */
struct iwl4965_rxon_cmd {
        u8 node_addr[6];
        __le16 reserved1;
        u8 bssid_addr[6];
        __le16 reserved2;
        u8 wlap_bssid_addr[6];
        __le16 reserved3;
        u8 dev_type;
        u8 air_propagation;
        __le16 rx_chain;
        u8 ofdm_basic_rates;
        u8 cck_basic_rates;
        __le16 assoc_id;
        __le32 flags;
        __le32 filter_flags;
        __le16 channel;
        u8 ofdm_ht_single_stream_basic_rates;
        u8 ofdm_ht_dual_stream_basic_rates;
} __attribute__ ((packed));

/*
 * REPLY_RXON_ASSOC = 0x11 (command, has simple generic response)
 */
struct iwl4965_rxon_assoc_cmd {
        __le32 flags;
        __le32 filter_flags;
        u8 ofdm_basic_rates;
        u8 cck_basic_rates;
        u8 ofdm_ht_single_stream_basic_rates;
        u8 ofdm_ht_dual_stream_basic_rates;
        __le16 rx_chain_select_flags;
        __le16 reserved;
} __attribute__ ((packed));

/*
 * REPLY_RXON_TIMING = 0x14 (command, has simple generic response)
 */
struct iwl4965_rxon_time_cmd {
        union tsf timestamp;
        __le16 beacon_interval;
        __le16 atim_window;
        __le32 beacon_init_val;
        __le16 listen_interval;
        __le16 reserved;
} __attribute__ ((packed));

/*
 * REPLY_CHANNEL_SWITCH = 0x72 (command, has simple generic response)
 */
struct iwl4965_channel_switch_cmd {
        u8 band;
        u8 expect_beacon;
        __le16 channel;
        __le32 rxon_flags;
        __le32 rxon_filter_flags;
        __le32 switch_time;
        struct iwl4965_tx_power_db tx_power;
} __attribute__ ((packed));

/*
 * CHANNEL_SWITCH_NOTIFICATION = 0x73 (notification only, not a command)
 */
struct iwl4965_csa_notification {
        __le16 band;
        __le16 channel;
        __le32 status;          /* 0 - OK, 1 - fail */
} __attribute__ ((packed));

/******************************************************************************
 * (2)
 * Quality-of-Service (QOS) Commands & Responses:
 *
 *****************************************************************************/

/**
 * struct iwl_ac_qos -- QOS timing params for REPLY_QOS_PARAM
 * One for each of 4 EDCA access categories in struct iwl_qosparam_cmd
 *
 * @cw_min: Contention window, start value in numbers of slots.
 *          Should be a power-of-2, minus 1.  Device's default is 0x0f.
 * @cw_max: Contention window, max value in numbers of slots.
 *          Should be a power-of-2, minus 1.  Device's default is 0x3f.
 * @aifsn:  Number of slots in Arbitration Interframe Space (before
 *          performing random backoff timing prior to Tx).  Device default 1.
 * @edca_txop:  Length of Tx opportunity, in uSecs.  Device default is 0.
 *
 * Device will automatically increase contention window by (2*CW) + 1 for each
 * transmission retry.  Device uses cw_max as a bit mask, ANDed with new CW
 * value, to cap the CW value.
 */
struct iwl4965_ac_qos {
        __le16 cw_min;
        __le16 cw_max;
        u8 aifsn;
        u8 reserved1;
        __le16 edca_txop;
} __attribute__ ((packed));

/* QoS flags defines */
#define QOS_PARAM_FLG_UPDATE_EDCA_MSK   __constant_cpu_to_le32(0x01)
#define QOS_PARAM_FLG_TGN_MSK           __constant_cpu_to_le32(0x02)
#define QOS_PARAM_FLG_TXOP_TYPE_MSK     __constant_cpu_to_le32(0x10)

/* Number of Access Categories (AC) (EDCA), queues 0..3 */
#define AC_NUM                4

/*
 * REPLY_QOS_PARAM = 0x13 (command, has simple generic response)
 *
 * This command sets up timings for each of the 4 prioritized EDCA Tx FIFOs
 * 0: Background, 1: Best Effort, 2: Video, 3: Voice.
 */
struct iwl4965_qosparam_cmd {
        __le32 qos_flags;
        struct iwl4965_ac_qos ac[AC_NUM];
} __attribute__ ((packed));

/******************************************************************************
 * (3)
 * Add/Modify Stations Commands & Responses:
 *
 *****************************************************************************/
/*
 * Multi station support
 */

/* Special, dedicated locations within device's station table */
#define IWL_AP_ID               0
#define IWL_MULTICAST_ID        1
#define IWL_STA_ID              2
#define IWL4965_BROADCAST_ID    31
#define IWL4965_STATION_COUNT   32

#define IWL_STATION_COUNT       32      /* MAX(3945,4965)*/
#define IWL_INVALID_STATION     255

#define STA_FLG_PWR_SAVE_MSK            __constant_cpu_to_le32(1 << 8);
#define STA_FLG_RTS_MIMO_PROT_MSK       __constant_cpu_to_le32(1 << 17)
#define STA_FLG_AGG_MPDU_8US_MSK        __constant_cpu_to_le32(1 << 18)
#define STA_FLG_MAX_AGG_SIZE_POS        (19)
#define STA_FLG_MAX_AGG_SIZE_MSK        __constant_cpu_to_le32(3 << 19)
#define STA_FLG_FAT_EN_MSK              __constant_cpu_to_le32(1 << 21)
#define STA_FLG_MIMO_DIS_MSK            __constant_cpu_to_le32(1 << 22)
#define STA_FLG_AGG_MPDU_DENSITY_POS    (23)
#define STA_FLG_AGG_MPDU_DENSITY_MSK    __constant_cpu_to_le32(7 << 23)

/* Use in mode field.  1: modify existing entry, 0: add new station entry */
#define STA_CONTROL_MODIFY_MSK          0x01

/* key flags __le16*/
#define STA_KEY_FLG_ENCRYPT_MSK __constant_cpu_to_le16(0x7)
#define STA_KEY_FLG_NO_ENC      __constant_cpu_to_le16(0x0)
#define STA_KEY_FLG_WEP         __constant_cpu_to_le16(0x1)
#define STA_KEY_FLG_CCMP        __constant_cpu_to_le16(0x2)
#define STA_KEY_FLG_TKIP        __constant_cpu_to_le16(0x3)

#define STA_KEY_FLG_KEYID_POS   8
#define STA_KEY_FLG_INVALID     __constant_cpu_to_le16(0x0800)

/* Flags indicate whether to modify vs. don't change various station params */
#define STA_MODIFY_KEY_MASK             0x01
#define STA_MODIFY_TID_DISABLE_TX       0x02
#define STA_MODIFY_TX_RATE_MSK          0x04
#define STA_MODIFY_ADDBA_TID_MSK        0x08
#define STA_MODIFY_DELBA_TID_MSK        0x10

/* Receiver address (actually, Rx station's index into station table),
 * combined with Traffic ID (QOS priority), in format used by Tx Scheduler */
#define BUILD_RAxTID(sta_id, tid)       (((sta_id) << 4) + (tid))

struct iwl4965_keyinfo {
        __le16 key_flags;
        u8 tkip_rx_tsc_byte2;   /* TSC[2] for key mix ph1 detection */
        u8 reserved1;
        __le16 tkip_rx_ttak[5]; /* 10-byte unicast TKIP TTAK */
        __le16 reserved2;
        u8 key[16];             /* 16-byte unicast decryption key */
} __attribute__ ((packed));

/**
 * struct sta_id_modify
 * @addr[ETH_ALEN]: station's MAC address
 * @sta_id: index of station in uCode's station table
 * @modify_mask: STA_MODIFY_*, 1: modify, 0: don't change
 *
 * Driver selects unused table index when adding new station,
 * or the index to a pre-existing station entry when modifying that station.
 * Some indexes have special purposes (IWL_AP_ID, index 0, is for AP).
 *
 * modify_mask flags select which parameters to modify vs. leave alone.
 */
struct sta_id_modify {
        u8 addr[ETH_ALEN];
        __le16 reserved1;
        u8 sta_id;
        u8 modify_mask;
        __le16 reserved2;
} __attribute__ ((packed));

/*
 * REPLY_ADD_STA = 0x18 (command)
 *
 * The device contains an internal table of per-station information,
 * with info on security keys, aggregation parameters, and Tx rates for
 * initial Tx attempt and any retries (4965 uses REPLY_TX_LINK_QUALITY_CMD,
 * 3945 uses REPLY_RATE_SCALE to set up rate tables).
 *
 * REPLY_ADD_STA sets up the table entry for one station, either creating
 * a new entry, or modifying a pre-existing one.
 *
 * NOTE:  RXON command (without "associated" bit set) wipes the station table
 *        clean.  Moving into RF_KILL state does this also.  Driver must set up
 *        new station table before transmitting anything on the RXON channel
 *        (except active scans or active measurements; those commands carry
 *        their own txpower/rate setup data).
 *
 *        When getting started on a new channel, driver must set up the
 *        IWL_BROADCAST_ID entry (last entry in the table).  For a client
 *        station in a BSS, once an AP is selected, driver sets up the AP STA
 *        in the IWL_AP_ID entry (1st entry in the table).  BROADCAST and AP
 *        are all that are needed for a BSS client station.  If the device is
 *        used as AP, or in an IBSS network, driver must set up station table
 *        entries for all STAs in network, starting with index IWL_STA_ID.
 */
struct iwl4965_addsta_cmd {
        u8 mode;                /* 1: modify existing, 0: add new station */
        u8 reserved[3];
        struct sta_id_modify sta;
        struct iwl4965_keyinfo key;
        __le32 station_flags;           /* STA_FLG_* */
        __le32 station_flags_msk;       /* STA_FLG_* */

        /* bit field to disable (1) or enable (0) Tx for Traffic ID (TID)
         * corresponding to bit (e.g. bit 5 controls TID 5).
         * Set modify_mask bit STA_MODIFY_TID_DISABLE_TX to use this field. */
        __le16 tid_disable_tx;

        __le16  reserved1;

        /* TID for which to add block-ack support.
         * Set modify_mask bit STA_MODIFY_ADDBA_TID_MSK to use this field. */
        u8 add_immediate_ba_tid;

        /* TID for which to remove block-ack support.
         * Set modify_mask bit STA_MODIFY_DELBA_TID_MSK to use this field. */
        u8 remove_immediate_ba_tid;

        /* Starting Sequence Number for added block-ack support.
         * Set modify_mask bit STA_MODIFY_ADDBA_TID_MSK to use this field. */
        __le16 add_immediate_ba_ssn;

        __le32 reserved2;
} __attribute__ ((packed));

#define ADD_STA_SUCCESS_MSK             0x1
#define ADD_STA_NO_ROOM_IN_TABLE        0x2
#define ADD_STA_NO_BLOCK_ACK_RESOURCE   0x4
#define ADD_STA_MODIFY_NON_EXIST_STA    0x8
/*
 * REPLY_ADD_STA = 0x18 (response)
 */
struct iwl4965_add_sta_resp {
        u8 status;      /* ADD_STA_* */
} __attribute__ ((packed));


/******************************************************************************
 * (4)
 * Rx Responses:
 *
 *****************************************************************************/

struct iwl4965_rx_frame_stats {
        u8 phy_count;
        u8 id;
        u8 rssi;
        u8 agc;
        __le16 sig_avg;
        __le16 noise_diff;
        u8 payload[0];
} __attribute__ ((packed));

struct iwl4965_rx_frame_hdr {
        __le16 channel;
        __le16 phy_flags;
        u8 reserved1;
        u8 rate;
        __le16 len;
        u8 payload[0];
} __attribute__ ((packed));

#define RX_RES_STATUS_NO_CRC32_ERROR    __constant_cpu_to_le32(1 << 0)
#define RX_RES_STATUS_NO_RXE_OVERFLOW   __constant_cpu_to_le32(1 << 1)

#define RX_RES_PHY_FLAGS_BAND_24_MSK    __constant_cpu_to_le16(1 << 0)
#define RX_RES_PHY_FLAGS_MOD_CCK_MSK            __constant_cpu_to_le16(1 << 1)
#define RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK     __constant_cpu_to_le16(1 << 2)
#define RX_RES_PHY_FLAGS_NARROW_BAND_MSK        __constant_cpu_to_le16(1 << 3)
#define RX_RES_PHY_FLAGS_ANTENNA_MSK            __constant_cpu_to_le16(0xf0)

#define RX_RES_STATUS_SEC_TYPE_MSK      (0x7 << 8)
#define RX_RES_STATUS_SEC_TYPE_NONE     (0x0 << 8)
#define RX_RES_STATUS_SEC_TYPE_WEP      (0x1 << 8)
#define RX_RES_STATUS_SEC_TYPE_CCMP     (0x2 << 8)
#define RX_RES_STATUS_SEC_TYPE_TKIP     (0x3 << 8)

#define RX_RES_STATUS_DECRYPT_TYPE_MSK  (0x3 << 11)
#define RX_RES_STATUS_NOT_DECRYPT       (0x0 << 11)
#define RX_RES_STATUS_DECRYPT_OK        (0x3 << 11)
#define RX_RES_STATUS_BAD_ICV_MIC       (0x1 << 11)
#define RX_RES_STATUS_BAD_KEY_TTAK      (0x2 << 11)

struct iwl4965_rx_frame_end {
        __le32 status;
        __le64 timestamp;
        __le32 beacon_timestamp;
} __attribute__ ((packed));

/*
 * REPLY_3945_RX = 0x1b (response only, not a command)
 *
 * NOTE:  DO NOT dereference from casts to this structure
 * It is provided only for calculating minimum data set size.
 * The actual offsets of the hdr and end are dynamic based on
 * stats.phy_count
 */
struct iwl4965_rx_frame {
        struct iwl4965_rx_frame_stats stats;
        struct iwl4965_rx_frame_hdr hdr;
        struct iwl4965_rx_frame_end end;
} __attribute__ ((packed));

/* Fixed (non-configurable) rx data from phy */
#define RX_PHY_FLAGS_ANTENNAE_OFFSET            (4)
#define RX_PHY_FLAGS_ANTENNAE_MASK              (0x70)
#define IWL_AGC_DB_MASK         (0x3f80)        /* MASK(7,13) */
#define IWL_AGC_DB_POS          (7)
struct iwl4965_rx_non_cfg_phy {
        __le16 ant_selection;   /* ant A bit 4, ant B bit 5, ant C bit 6 */
        __le16 agc_info;        /* agc code 0:6, agc dB 7:13, reserved 14:15 */
        u8 rssi_info[6];        /* we use even entries, 0/2/4 for A/B/C rssi */
        u8 pad[0];
} __attribute__ ((packed));

/*
 * REPLY_4965_RX = 0xc3 (response only, not a command)
 * Used only for legacy (non 11n) frames.
 */
#define RX_RES_PHY_CNT 14
struct iwl4965_rx_phy_res {
        u8 non_cfg_phy_cnt;     /* non configurable DSP phy data byte count */
        u8 cfg_phy_cnt;         /* configurable DSP phy data byte count */
        u8 stat_id;             /* configurable DSP phy data set ID */
        u8 reserved1;
        __le64 timestamp;       /* TSF at on air rise */
        __le32 beacon_time_stamp; /* beacon at on-air rise */
        __le16 phy_flags;       /* general phy flags: band, modulation, ... */
        __le16 channel;         /* channel number */
        __le16 non_cfg_phy[RX_RES_PHY_CNT];     /* upto 14 phy entries */
        __le32 reserved2;
        __le32 rate_n_flags;    /* RATE_MCS_* */
        __le16 byte_count;      /* frame's byte-count */
        __le16 reserved3;
} __attribute__ ((packed));

struct iwl4965_rx_mpdu_res_start {
        __le16 byte_count;
        __le16 reserved;
} __attribute__ ((packed));


/******************************************************************************
 * (5)
 * Tx Commands & Responses:
 *
 * Driver must place each REPLY_TX command into one of the prioritized Tx
 * queues in host DRAM, shared between driver and device (see comments for
 * SCD registers and Tx/Rx Queues).  When the device's Tx scheduler and uCode
 * are preparing to transmit, the device pulls the Tx command over the PCI
 * bus via one of the device's Tx DMA channels, to fill an internal FIFO
 * from which data will be transmitted.
 *
 * uCode handles all timing and protocol related to control frames
 * (RTS/CTS/ACK), based on flags in the Tx command.  uCode and Tx scheduler
 * handle reception of block-acks; uCode updates the host driver via
 * REPLY_COMPRESSED_BA (4965).
 *
 * uCode handles retrying Tx when an ACK is expected but not received.
 * This includes trying lower data rates than the one requested in the Tx
 * command, as set up by the REPLY_RATE_SCALE (for 3945) or
 * REPLY_TX_LINK_QUALITY_CMD (4965).
 *
 * Driver sets up transmit power for various rates via REPLY_TX_PWR_TABLE_CMD.
 * This command must be executed after every RXON command, before Tx can occur.
 *****************************************************************************/

/* REPLY_TX Tx flags field */

/* 1: Use Request-To-Send protocol before this frame.
 * Mutually exclusive vs. TX_CMD_FLG_CTS_MSK. */
#define TX_CMD_FLG_RTS_MSK __constant_cpu_to_le32(1 << 1)

/* 1: Transmit Clear-To-Send to self before this frame.
 * Driver should set this for AUTH/DEAUTH/ASSOC-REQ/REASSOC mgmnt frames.
 * Mutually exclusive vs. TX_CMD_FLG_RTS_MSK. */
#define TX_CMD_FLG_CTS_MSK __constant_cpu_to_le32(1 << 2)

/* 1: Expect ACK from receiving station
 * 0: Don't expect ACK (MAC header's duration field s/b 0)
 * Set this for unicast frames, but not broadcast/multicast. */
#define TX_CMD_FLG_ACK_MSK __constant_cpu_to_le32(1 << 3)

/* For 4965:
 * 1: Use rate scale table (see REPLY_TX_LINK_QUALITY_CMD).
 *    Tx command's initial_rate_index indicates first rate to try;
 *    uCode walks through table for additional Tx attempts.
 * 0: Use Tx rate/MCS from Tx command's rate_n_flags field.
 *    This rate will be used for all Tx attempts; it will not be scaled. */
#define TX_CMD_FLG_STA_RATE_MSK __constant_cpu_to_le32(1 << 4)

/* 1: Expect immediate block-ack.
 * Set when Txing a block-ack request frame.  Also set TX_CMD_FLG_ACK_MSK. */
#define TX_CMD_FLG_IMM_BA_RSP_MASK  __constant_cpu_to_le32(1 << 6)

/* 1: Frame requires full Tx-Op protection.
 * Set this if either RTS or CTS Tx Flag gets set. */
#define TX_CMD_FLG_FULL_TXOP_PROT_MSK __constant_cpu_to_le32(1 << 7)

/* Tx antenna selection field; used only for 3945, reserved (0) for 4965.
 * Set field to "0" to allow 3945 uCode to select antenna (normal usage). */
#define TX_CMD_FLG_ANT_SEL_MSK __constant_cpu_to_le32(0xf00)
#define TX_CMD_FLG_ANT_A_MSK __constant_cpu_to_le32(1 << 8)
#define TX_CMD_FLG_ANT_B_MSK __constant_cpu_to_le32(1 << 9)

/* 1: Ignore Bluetooth priority for this frame.
 * 0: Delay Tx until Bluetooth device is done (normal usage). */
#define TX_CMD_FLG_BT_DIS_MSK __constant_cpu_to_le32(1 << 12)

/* 1: uCode overrides sequence control field in MAC header.
 * 0: Driver provides sequence control field in MAC header.
 * Set this for management frames, non-QOS data frames, non-unicast frames,
 * and also in Tx command embedded in REPLY_SCAN_CMD for active scans. */
#define TX_CMD_FLG_SEQ_CTL_MSK __constant_cpu_to_le32(1 << 13)

/* 1: This frame is non-last MPDU; more fragments are coming.
 * 0: Last fragment, or not using fragmentation. */
#define TX_CMD_FLG_MORE_FRAG_MSK __constant_cpu_to_le32(1 << 14)

/* 1: uCode calculates and inserts Timestamp Function (TSF) in outgoing frame.
 * 0: No TSF required in outgoing frame.
 * Set this for transmitting beacons and probe responses. */
#define TX_CMD_FLG_TSF_MSK __constant_cpu_to_le32(1 << 16)

/* 1: Driver inserted 2 bytes pad after the MAC header, for (required) dword
 *    alignment of frame's payload data field.
 * 0: No pad
 * Set this for MAC headers with 26 or 30 bytes, i.e. those with QOS or ADDR4
 * field (but not both).  Driver must align frame data (i.e. data following
 * MAC header) to DWORD boundary. */
#define TX_CMD_FLG_MH_PAD_MSK __constant_cpu_to_le32(1 << 20)

/* HCCA-AP - disable duration overwriting. */
#define TX_CMD_FLG_DUR_MSK __constant_cpu_to_le32(1 << 25)


/*
 * TX command security control
 */
#define TX_CMD_SEC_WEP          0x01
#define TX_CMD_SEC_CCM          0x02
#define TX_CMD_SEC_TKIP         0x03
#define TX_CMD_SEC_MSK          0x03
#define TX_CMD_SEC_SHIFT        6
#define TX_CMD_SEC_KEY128       0x08

/*
 * 4965 uCode updates these Tx attempt count values in host DRAM.
 * Used for managing Tx retries when expecting block-acks.
 * Driver should set these fields to 0.
 */
struct iwl4965_dram_scratch {
        u8 try_cnt;             /* Tx attempts */
        u8 bt_kill_cnt;         /* Tx attempts blocked by Bluetooth device */
        __le16 reserved;
} __attribute__ ((packed));

/*
 * REPLY_TX = 0x1c (command)
 */
struct iwl4965_tx_cmd {
        /*
         * MPDU byte count:
         * MAC header (24/26/30/32 bytes) + 2 bytes pad if 26/30 header size,
         * + 8 byte IV for CCM or TKIP (not used for WEP)
         * + Data payload
         * + 8-byte MIC (not used for CCM/WEP)
         * NOTE:  Does not include Tx command bytes, post-MAC pad bytes,
         *        MIC (CCM) 8 bytes, ICV (WEP/TKIP/CKIP) 4 bytes, CRC 4 bytes.i
         * Range: 14-2342 bytes.
         */
        __le16 len;

        /*
         * MPDU or MSDU byte count for next frame.
         * Used for fragmentation and bursting, but not 11n aggregation.
         * Same as "len", but for next frame.  Set to 0 if not applicable.
         */
        __le16 next_frame_len;

        __le32 tx_flags;        /* TX_CMD_FLG_* */

        /* 4965's uCode may modify this field of the Tx command (in host DRAM!).
         * Driver must also set dram_lsb_ptr and dram_msb_ptr in this cmd. */
        struct iwl4965_dram_scratch scratch;

        /* Rate for *all* Tx attempts, if TX_CMD_FLG_STA_RATE_MSK is cleared. */
        __le32 rate_n_flags;    /* RATE_MCS_* */

        /* Index of destination station in uCode's station table */
        u8 sta_id;

        /* Type of security encryption:  CCM or TKIP */
        u8 sec_ctl;             /* TX_CMD_SEC_* */

        /*
         * Index into rate table (see REPLY_TX_LINK_QUALITY_CMD) for initial
         * Tx attempt, if TX_CMD_FLG_STA_RATE_MSK is set.  Normally "0" for
         * data frames, this field may be used to selectively reduce initial
         * rate (via non-0 value) for special frames (e.g. management), while
         * still supporting rate scaling for all frames.
         */
        u8 initial_rate_index;
        u8 reserved;
        u8 key[16];
        __le16 next_frame_flags;
        __le16 reserved2;
        union {
                __le32 life_time;
                __le32 attempt;
        } stop_time;

        /* Host DRAM physical address pointer to "scratch" in this command.
         * Must be dword aligned.  "0" in dram_lsb_ptr disables usage. */
        __le32 dram_lsb_ptr;
        u8 dram_msb_ptr;

        u8 rts_retry_limit;     /*byte 50 */
        u8 data_retry_limit;    /*byte 51 */
        u8 tid_tspec;
        union {
                __le16 pm_frame_timeout;
                __le16 attempt_duration;
        } timeout;

        /*
         * Duration of EDCA burst Tx Opportunity, in 32-usec units.
         * Set this if txop time is not specified by HCCA protocol (e.g. by AP).
         */
        __le16 driver_txop;

        /*
         * MAC header goes here, followed by 2 bytes padding if MAC header
         * length is 26 or 30 bytes, followed by payload data
         */
        u8 payload[0];
        struct ieee80211_hdr hdr[0];
} __attribute__ ((packed));

/* TX command response is sent after *all* transmission attempts.
 *
 * NOTES:
 *
 * TX_STATUS_FAIL_NEXT_FRAG
 *
 * If the fragment flag in the MAC header for the frame being transmitted
 * is set and there is insufficient time to transmit the next frame, the
 * TX status will be returned with 'TX_STATUS_FAIL_NEXT_FRAG'.
 *
 * TX_STATUS_FIFO_UNDERRUN
 *
 * Indicates the host did not provide bytes to the FIFO fast enough while
 * a TX was in progress.
 *
 * TX_STATUS_FAIL_MGMNT_ABORT
 *
 * This status is only possible if the ABORT ON MGMT RX parameter was
 * set to true with the TX command.
 *
 * If the MSB of the status parameter is set then an abort sequence is
 * required.  This sequence consists of the host activating the TX Abort
 * control line, and then waiting for the TX Abort command response.  This
 * indicates that a the device is no longer in a transmit state, and that the
 * command FIFO has been cleared.  The host must then deactivate the TX Abort
 * control line.  Receiving is still allowed in this case.
 */
enum {
        TX_STATUS_SUCCESS = 0x01,
        TX_STATUS_DIRECT_DONE = 0x02,
        TX_STATUS_FAIL_SHORT_LIMIT = 0x82,
        TX_STATUS_FAIL_LONG_LIMIT = 0x83,
        TX_STATUS_FAIL_FIFO_UNDERRUN = 0x84,
        TX_STATUS_FAIL_MGMNT_ABORT = 0x85,
        TX_STATUS_FAIL_NEXT_FRAG = 0x86,
        TX_STATUS_FAIL_LIFE_EXPIRE = 0x87,
        TX_STATUS_FAIL_DEST_PS = 0x88,
        TX_STATUS_FAIL_ABORTED = 0x89,
        TX_STATUS_FAIL_BT_RETRY = 0x8a,
        TX_STATUS_FAIL_STA_INVALID = 0x8b,
        TX_STATUS_FAIL_FRAG_DROPPED = 0x8c,
        TX_STATUS_FAIL_TID_DISABLE = 0x8d,
        TX_STATUS_FAIL_FRAME_FLUSHED = 0x8e,
        TX_STATUS_FAIL_INSUFFICIENT_CF_POLL = 0x8f,
        TX_STATUS_FAIL_TX_LOCKED = 0x90,
        TX_STATUS_FAIL_NO_BEACON_ON_RADAR = 0x91,
};

#define TX_PACKET_MODE_REGULAR          0x0000
#define TX_PACKET_MODE_BURST_SEQ        0x0100
#define TX_PACKET_MODE_BURST_FIRST      0x0200

enum {
        TX_POWER_PA_NOT_ACTIVE = 0x0,
};

enum {
        TX_STATUS_MSK = 0x000000ff,     /* bits 0:7 */
        TX_STATUS_DELAY_MSK = 0x00000040,
        TX_STATUS_ABORT_MSK = 0x00000080,
        TX_PACKET_MODE_MSK = 0x0000ff00,        /* bits 8:15 */
        TX_FIFO_NUMBER_MSK = 0x00070000,        /* bits 16:18 */
        TX_RESERVED = 0x00780000,       /* bits 19:22 */
        TX_POWER_PA_DETECT_MSK = 0x7f800000,    /* bits 23:30 */
        TX_ABORT_REQUIRED_MSK = 0x80000000,     /* bits 31:31 */
};

/* *******************************
 * TX aggregation status
 ******************************* */

enum {
        AGG_TX_STATE_TRANSMITTED = 0x00,
        AGG_TX_STATE_UNDERRUN_MSK = 0x01,
        AGG_TX_STATE_BT_PRIO_MSK = 0x02,
        AGG_TX_STATE_FEW_BYTES_MSK = 0x04,
        AGG_TX_STATE_ABORT_MSK = 0x08,
        AGG_TX_STATE_LAST_SENT_TTL_MSK = 0x10,
        AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK = 0x20,
        AGG_TX_STATE_LAST_SENT_BT_KILL_MSK = 0x40,
        AGG_TX_STATE_SCD_QUERY_MSK = 0x80,
        AGG_TX_STATE_TEST_BAD_CRC32_MSK = 0x100,
        AGG_TX_STATE_RESPONSE_MSK = 0x1ff,
        AGG_TX_STATE_DUMP_TX_MSK = 0x200,
        AGG_TX_STATE_DELAY_TX_MSK = 0x400
};

#define AGG_TX_STATE_LAST_SENT_MSK \
(AGG_TX_STATE_LAST_SENT_TTL_MSK | \
 AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK | \
 AGG_TX_STATE_LAST_SENT_BT_KILL_MSK)

/* # tx attempts for first frame in aggregation */
#define AGG_TX_STATE_TRY_CNT_POS 12
#define AGG_TX_STATE_TRY_CNT_MSK 0xf000

/* Command ID and sequence number of Tx command for this frame */
#define AGG_TX_STATE_SEQ_NUM_POS 16
#define AGG_TX_STATE_SEQ_NUM_MSK 0xffff0000

/*
 * REPLY_TX = 0x1c (response)
 *
 * This response may be in one of two slightly different formats, indicated
 * by the frame_count field:
 *
 * 1)  No aggregation (frame_count == 1).  This reports Tx results for
 *     a single frame.  Multiple attempts, at various bit rates, may have
 *     been made for this frame.
 *
 * 2)  Aggregation (frame_count > 1).  This reports Tx results for
 *     2 or more frames that used block-acknowledge.  All frames were
 *     transmitted at same rate.  Rate scaling may have been used if first
 *     frame in this new agg block failed in previous agg block(s).
 *
 *     Note that, for aggregation, ACK (block-ack) status is not delivered here;
 *     block-ack has not been received by the time the 4965 records this status.
 *     This status relates to reasons the tx might have been blocked or aborted
 *     within the sending station (this 4965), rather than whether it was
 *     received successfully by the destination station.
 */
struct iwl4965_tx_resp {
        u8 frame_count;         /* 1 no aggregation, >1 aggregation */
        u8 bt_kill_count;       /* # blocked by bluetooth (unused for agg) */
        u8 failure_rts;         /* # failures due to unsuccessful RTS */
        u8 failure_frame;       /* # failures due to no ACK (unused for agg) */

        /* For non-agg:  Rate at which frame was successful.
         * For agg:  Rate at which all frames were transmitted. */
        __le32 rate_n_flags;    /* RATE_MCS_*  */

        /* For non-agg:  RTS + CTS + frame tx attempts time + ACK.
         * For agg:  RTS + CTS + aggregation tx time + block-ack time. */
        __le16 wireless_media_time;     /* uSecs */

        __le16 reserved;
        __le32 pa_power1;       /* RF power amplifier measurement (not used) */
        __le32 pa_power2;

        /*
         * For non-agg:  frame status TX_STATUS_*
         * For agg:  status of 1st frame, AGG_TX_STATE_*; other frame status
         *           fields follow this one, up to frame_count.
         *           Bit fields:
         *           11- 0:  AGG_TX_STATE_* status code
         *           15-12:  Retry count for 1st frame in aggregation (retries
         *                   occur if tx failed for this frame when it was a
         *                   member of a previous aggregation block).  If rate
         *                   scaling is used, retry count indicates the rate
         *                   table entry used for all frames in the new agg.
         *           31-16:  Sequence # for this frame's Tx cmd (not SSN!)
         */
        __le32 status;  /* TX status (for aggregation status of 1st frame) */
} __attribute__ ((packed));

/*
 * REPLY_COMPRESSED_BA = 0xc5 (response only, not a command)
 *
 * Reports Block-Acknowledge from recipient station
 */
struct iwl4965_compressed_ba_resp {
        __le32 sta_addr_lo32;
        __le16 sta_addr_hi16;
        __le16 reserved;

        /* Index of recipient (BA-sending) station in uCode's station table */
        u8 sta_id;
        u8 tid;
        __le16 ba_seq_ctl;
        __le32 ba_bitmap0;
        __le32 ba_bitmap1;
        __le16 scd_flow;
        __le16 scd_ssn;
} __attribute__ ((packed));

/*
 * REPLY_TX_PWR_TABLE_CMD = 0x97 (command, has simple generic response)
 *
 * See details under "TXPOWER" in iwl-4965-hw.h.
 */
struct iwl4965_txpowertable_cmd {
        u8 band;                /* 0: 5 GHz, 1: 2.4 GHz */
        u8 reserved;
        __le16 channel;
        struct iwl4965_tx_power_db tx_power;
} __attribute__ ((packed));

/*RS_NEW_API: only TLC_RTS remains and moved to bit 0 */
#define  LINK_QUAL_FLAGS_SET_STA_TLC_RTS_MSK    (1 << 0)

/* # of EDCA prioritized tx fifos */
#define  LINK_QUAL_AC_NUM AC_NUM

/* # entries in rate scale table to support Tx retries */
#define  LINK_QUAL_MAX_RETRY_NUM 16

/* Tx antenna selection values */
#define  LINK_QUAL_ANT_A_MSK (1 << 0)
#define  LINK_QUAL_ANT_B_MSK (1 << 1)
#define  LINK_QUAL_ANT_MSK   (LINK_QUAL_ANT_A_MSK|LINK_QUAL_ANT_B_MSK)


/**
 * struct iwl4965_link_qual_general_params
 *
 * Used in REPLY_TX_LINK_QUALITY_CMD
 */
struct iwl4965_link_qual_general_params {
        u8 flags;

        /* No entries at or above this (driver chosen) index contain MIMO */
        u8 mimo_delimiter;

        /* Best single antenna to use for single stream (legacy, SISO). */
        u8 single_stream_ant_msk;       /* LINK_QUAL_ANT_* */

        /* Best antennas to use for MIMO (unused for 4965, assumes both). */
        u8 dual_stream_ant_msk;         /* LINK_QUAL_ANT_* */

        /*
         * If driver needs to use different initial rates for different
         * EDCA QOS access categories (as implemented by tx fifos 0-3),
         * this table will set that up, by indicating the indexes in the
         * rs_table[LINK_QUAL_MAX_RETRY_NUM] rate table at which to start.
         * Otherwise, driver should set all entries to 0.
         *
         * Entry usage:
         * 0 = Background, 1 = Best Effort (normal), 2 = Video, 3 = Voice
         * TX FIFOs above 3 use same value (typically 0) as TX FIFO 3.
         */
        u8 start_rate_index[LINK_QUAL_AC_NUM];
} __attribute__ ((packed));

/**
 * struct iwl4965_link_qual_agg_params
 *
 * Used in REPLY_TX_LINK_QUALITY_CMD
 */
struct iwl4965_link_qual_agg_params {

        /* Maximum number of uSec in aggregation.
         * Driver should set this to 4000 (4 milliseconds). */
        __le16 agg_time_limit;

        /*
         * Number of Tx retries allowed for a frame, before that frame will
         * no longer be considered for the start of an aggregation sequence
         * (scheduler will then try to tx it as single frame).
         * Driver should set this to 3.
         */
        u8 agg_dis_start_th;

        /*
         * Maximum number of frames in aggregation.
         * 0 = no limit (default).  1 = no aggregation.
         * Other values = max # frames in aggregation.
         */
        u8 agg_frame_cnt_limit;

        __le32 reserved;
} __attribute__ ((packed));

/*
 * REPLY_TX_LINK_QUALITY_CMD = 0x4e (command, has simple generic response)
 *
 * For 4965 only; 3945 uses REPLY_RATE_SCALE.
 *
 * Each station in the 4965's internal station table has its own table of 16
 * Tx rates and modulation modes (e.g. legacy/SISO/MIMO) for retrying Tx when
 * an ACK is not received.  This command replaces the entire table for
 * one station.
 *
 * NOTE:  Station must already be in 4965's station table.  Use REPLY_ADD_STA.
 *
 * The rate scaling procedures described below work well.  Of course, other
 * procedures are possible, and may work better for particular environments.
 *
 *
 * FILLING THE RATE TABLE
 *
 * Given a particular initial rate and mode, as determined by the rate
 * scaling algorithm described below, the Linux driver uses the following
 * formula to fill the rs_table[LINK_QUAL_MAX_RETRY_NUM] rate table in the
 * Link Quality command:
 *
 *
 * 1)  If using High-throughput (HT) (SISO or MIMO) initial rate:
 *     a) Use this same initial rate for first 3 entries.
 *     b) Find next lower available rate using same mode (SISO or MIMO),
 *        use for next 3 entries.  If no lower rate available, switch to
 *        legacy mode (no FAT channel, no MIMO, no short guard interval).
 *     c) If using MIMO, set command's mimo_delimiter to number of entries
 *        using MIMO (3 or 6).
 *     d) After trying 2 HT rates, switch to legacy mode (no FAT channel,
 *        no MIMO, no short guard interval), at the next lower bit rate
 *        (e.g. if second HT bit rate was 54, try 48 legacy), and follow
 *        legacy procedure for remaining table entries.
 *
 * 2)  If using legacy initial rate:
 *     a) Use the initial rate for only one entry.
 *     b) For each following entry, reduce the rate to next lower available
 *        rate, until reaching the lowest available rate.
 *     c) When reducing rate, also switch antenna selection.
 *     d) Once lowest available rate is reached, repeat this rate until
 *        rate table is filled (16 entries), switching antenna each entry.
 *
 *
 * ACCUMULATING HISTORY
 *
 * The rate scaling algorithm for 4965, as implemented in Linux driver, uses
 * two sets of frame Tx success history:  One for the current/active modulation
 * mode, and one for a speculative/search mode that is being attempted.  If the
 * speculative mode turns out to be more effective (i.e. actual transfer
 * rate is better), then the driver continues to use the speculative mode
 * as the new current active mode.
 *
 * Each history set contains, separately for each possible rate, data for a
 * sliding window of the 62 most recent tx attempts at that rate.  The data
 * includes a shifting bitmap of success(1)/failure(0), and sums of successful
 * and attempted frames, from which the driver can additionally calculate a
 * success ratio (success / attempted) and number of failures
 * (attempted - success), and control the size of the window (attempted).
 * The driver uses the bit map to remove successes from the success sum, as
 * the oldest tx attempts fall out of the window.
 *
 * When the 4965 makes multiple tx attempts for a given frame, each attempt
 * might be at a different rate, and have different modulation characteristics
 * (e.g. antenna, fat channel, short guard interval), as set up in the rate
 * scaling table in the Link Quality command.  The driver must determine
 * which rate table entry was used for each tx attempt, to determine which
 * rate-specific history to update, and record only those attempts that
 * match the modulation characteristics of the history set.
 *
 * When using block-ack (aggregation), all frames are transmitted at the same
 * rate, since there is no per-attempt acknowledgement from the destination
 * station.  The Tx response struct iwl_tx_resp indicates the Tx rate in
 * rate_n_flags field.  After receiving a block-ack, the driver can update
 * history for the entire block all at once.
 *
 *
 * FINDING BEST STARTING RATE:
 *
 * When working with a selected initial modulation mode (see below), the
 * driver attempts to find a best initial rate.  The initial rate is the
 * first entry in the Link Quality command's rate table.
 *
 * 1)  Calculate actual throughput (success ratio * expected throughput, see
 *     table below) for current initial rate.  Do this only if enough frames
 *     have been attempted to make the value meaningful:  at least 6 failed
 *     tx attempts, or at least 8 successes.  If not enough, don't try rate
 *     scaling yet.
 *
 * 2)  Find available rates adjacent to current initial rate.  Available means:
 *     a)  supported by hardware &&
 *     b)  supported by association &&
 *     c)  within any constraints selected by user
 *
 * 3)  Gather measured throughputs for adjacent rates.  These might not have
 *     enough history to calculate a throughput.  That's okay, we might try
 *     using one of them anyway!
 *
 * 4)  Try decreasing rate if, for current rate:
 *     a)  success ratio is < 15% ||
 *     b)  lower adjacent rate has better measured throughput ||
 *     c)  higher adjacent rate has worse throughput, and lower is unmeasured
 *
 *     As a sanity check, if decrease was determined above, leave rate
 *     unchanged if:
 *     a)  lower rate unavailable
 *     b)  success ratio at current rate > 85% (very good)
 *     c)  current measured throughput is better than expected throughput
 *         of lower rate (under perfect 100% tx conditions, see table below)
 *
 * 5)  Try increasing rate if, for current rate:
 *     a)  success ratio is < 15% ||
 *     b)  both adjacent rates' throughputs are unmeasured (try it!) ||
 *     b)  higher adjacent rate has better measured throughput ||
 *     c)  lower adjacent rate has worse throughput, and higher is unmeasured
 *
 *     As a sanity check, if increase was determined above, leave rate
 *     unchanged if:
 *     a)  success ratio at current rate < 70%.  This is not particularly
 *         good performance; higher rate is sure to have poorer success.
 *
 * 6)  Re-evaluate the rate after each tx frame.  If working with block-
 *     acknowledge, history and statistics may be calculated for the entire
 *     block (including prior history that fits within the history windows),
 *     before re-evaluation.
 *
 * FINDING BEST STARTING MODULATION MODE:
 *
 * After working with a modulation mode for a "while" (and doing rate scaling),
 * the driver searches for a new initial mode in an attempt to improve
 * throughput.  The "while" is measured by numbers of attempted frames:
 *
 * For legacy mode, search for new mode after:
 *   480 successful frames, or 160 failed frames
 * For high-throughput modes (SISO or MIMO), search for new mode after:
 *   4500 successful frames, or 400 failed frames
 *
 * Mode switch possibilities are (3 for each mode):
 *
 * For legacy:
 *   Change antenna, try SISO (if HT association), try MIMO (if HT association)
 * For SISO:
 *   Change antenna, try MIMO, try shortened guard interval (SGI)
 * For MIMO:
 *   Try SISO antenna A, SISO antenna B, try shortened guard interval (SGI)
 *
 * When trying a new mode, use the same bit rate as the old/current mode when
 * trying antenna switches and shortened guard interval.  When switching to
 * SISO from MIMO or legacy, or to MIMO from SISO or legacy, use a rate
 * for which the expected throughput (under perfect conditions) is about the
 * same or slightly better than the actual measured throughput delivered by
 * the old/current mode.
 *
 * Actual throughput can be estimated by multiplying the expected throughput
 * by the success ratio (successful / attempted tx frames).  Frame size is
 * not considered in this calculation; it assumes that frame size will average
 * out to be fairly consistent over several samples.  The following are
 * metric values for expected throughput assuming 100% success ratio.
 * Only G band has support for CCK rates:
 *
 *           RATE:  1    2    5   11    6   9   12   18   24   36   48   54   60
 *
 *              G:  7   13   35   58   40  57   72   98  121  154  177  186  186
 *              A:  0    0    0    0   40  57   72   98  121  154  177  186  186
 *     SISO 20MHz:  0    0    0    0   42  42   76  102  124  159  183  193  202
 * SGI SISO 20MHz:  0    0    0    0   46  46   82  110  132  168  192  202  211
 *     MIMO 20MHz:  0    0    0    0   74  74  123  155  179  214  236  244  251
 * SGI MIMO 20MHz:  0    0    0    0   81  81  131  164  188  222  243  251  257
 *     SISO 40MHz:  0    0    0    0   77  77  127  160  184  220  242  250  257
 * SGI SISO 40MHz:  0    0    0    0   83  83  135  169  193  229  250  257  264
 *     MIMO 40MHz:  0    0    0    0  123 123  182  214  235  264  279  285  289
 * SGI MIMO 40MHz:  0    0    0    0  131 131  191  222  242  270  284  289  293
 *
 * After the new mode has been tried for a short while (minimum of 6 failed
 * frames or 8 successful frames), compare success ratio and actual throughput
 * estimate of the new mode with the old.  If either is better with the new
 * mode, continue to use the new mode.
 *
 * Continue comparing modes until all 3 possibilities have been tried.
 * If moving from legacy to HT, try all 3 possibilities from the new HT
 * mode.  After trying all 3, a best mode is found.  Continue to use this mode
 * for the longer "while" described above (e.g. 480 successful frames for
 * legacy), and then repeat the search process.
 *
 */
struct iwl4965_link_quality_cmd {

        /* Index of destination/recipient station in uCode's station table */
        u8 sta_id;
        u8 reserved1;
        __le16 control;         /* not used */
        struct iwl4965_link_qual_general_params general_params;
        struct iwl4965_link_qual_agg_params agg_params;

        /*
         * Rate info; when using rate-scaling, Tx command's initial_rate_index
         * specifies 1st Tx rate attempted, via index into this table.
         * 4965 works its way through table when retrying Tx.
         */
        struct {
                __le32 rate_n_flags;    /* RATE_MCS_*, IWL_RATE_* */
        } rs_table[LINK_QUAL_MAX_RETRY_NUM];
        __le32 reserved2;
} __attribute__ ((packed));

/*
 * REPLY_BT_CONFIG = 0x9b (command, has simple generic response)
 *
 * 3945 and 4965 support hardware handshake with Bluetooth device on
 * same platform.  Bluetooth device alerts wireless device when it will Tx;
 * wireless device can delay or kill its own Tx to accomodate.
 */
struct iwl4965_bt_cmd {
        u8 flags;
        u8 lead_time;
        u8 max_kill;
        u8 reserved;
        __le32 kill_ack_mask;
        __le32 kill_cts_mask;
} __attribute__ ((packed));

/******************************************************************************
 * (6)
 * Spectrum Management (802.11h) Commands, Responses, Notifications:
 *
 *****************************************************************************/

/*
 * Spectrum Management
 */
#define MEASUREMENT_FILTER_FLAG (RXON_FILTER_PROMISC_MSK         | \
                                 RXON_FILTER_CTL2HOST_MSK        | \
                                 RXON_FILTER_ACCEPT_GRP_MSK      | \
                                 RXON_FILTER_DIS_DECRYPT_MSK     | \
                                 RXON_FILTER_DIS_GRP_DECRYPT_MSK | \
                                 RXON_FILTER_ASSOC_MSK           | \
                                 RXON_FILTER_BCON_AWARE_MSK)

struct iwl4965_measure_channel {
        __le32 duration;        /* measurement duration in extended beacon
                                 * format */
        u8 channel;             /* channel to measure */
        u8 type;                /* see enum iwl4965_measure_type */
        __le16 reserved;
} __attribute__ ((packed));

/*
 * REPLY_SPECTRUM_MEASUREMENT_CMD = 0x74 (command)
 */
struct iwl4965_spectrum_cmd {
        __le16 len;             /* number of bytes starting from token */
        u8 token;               /* token id */
        u8 id;                  /* measurement id -- 0 or 1 */
        u8 origin;              /* 0 = TGh, 1 = other, 2 = TGk */
        u8 periodic;            /* 1 = periodic */
        __le16 path_loss_timeout;
        __le32 start_time;      /* start time in extended beacon format */
        __le32 reserved2;
        __le32 flags;           /* rxon flags */
        __le32 filter_flags;    /* rxon filter flags */
        __le16 channel_count;   /* minimum 1, maximum 10 */
        __le16 reserved3;
        struct iwl4965_measure_channel channels[10];
} __attribute__ ((packed));

/*
 * REPLY_SPECTRUM_MEASUREMENT_CMD = 0x74 (response)
 */
struct iwl4965_spectrum_resp {
        u8 token;
        u8 id;                  /* id of the prior command replaced, or 0xff */
        __le16 status;          /* 0 - command will be handled
                                 * 1 - cannot handle (conflicts with another
                                 *     measurement) */
} __attribute__ ((packed));

enum iwl4965_measurement_state {
        IWL_MEASUREMENT_START = 0,
        IWL_MEASUREMENT_STOP = 1,
};

enum iwl4965_measurement_status {
        IWL_MEASUREMENT_OK = 0,
        IWL_MEASUREMENT_CONCURRENT = 1,
        IWL_MEASUREMENT_CSA_CONFLICT = 2,
        IWL_MEASUREMENT_TGH_CONFLICT = 3,
        /* 4-5 reserved */
        IWL_MEASUREMENT_STOPPED = 6,
        IWL_MEASUREMENT_TIMEOUT = 7,
        IWL_MEASUREMENT_PERIODIC_FAILED = 8,
};

#define NUM_ELEMENTS_IN_HISTOGRAM 8

struct iwl4965_measurement_histogram {
        __le32 ofdm[NUM_ELEMENTS_IN_HISTOGRAM]; /* in 0.8usec counts */
        __le32 cck[NUM_ELEMENTS_IN_HISTOGRAM];  /* in 1usec counts */
} __attribute__ ((packed));

/* clear channel availability counters */
struct iwl4965_measurement_cca_counters {
        __le32 ofdm;
        __le32 cck;
} __attribute__ ((packed));

enum iwl4965_measure_type {
        IWL_MEASURE_BASIC = (1 << 0),
        IWL_MEASURE_CHANNEL_LOAD = (1 << 1),
        IWL_MEASURE_HISTOGRAM_RPI = (1 << 2),
        IWL_MEASURE_HISTOGRAM_NOISE = (1 << 3),
        IWL_MEASURE_FRAME = (1 << 4),
        /* bits 5:6 are reserved */
        IWL_MEASURE_IDLE = (1 << 7),
};

/*
 * SPECTRUM_MEASURE_NOTIFICATION = 0x75 (notification only, not a command)
 */
struct iwl4965_spectrum_notification {
        u8 id;                  /* measurement id -- 0 or 1 */
        u8 token;
        u8 channel_index;       /* index in measurement channel list */
        u8 state;               /* 0 - start, 1 - stop */
        __le32 start_time;      /* lower 32-bits of TSF */
        u8 band;                /* 0 - 5.2GHz, 1 - 2.4GHz */
        u8 channel;
        u8 type;                /* see enum iwl4965_measurement_type */
        u8 reserved1;
        /* NOTE:  cca_ofdm, cca_cck, basic_type, and histogram are only only
         * valid if applicable for measurement type requested. */
        __le32 cca_ofdm;        /* cca fraction time in 40Mhz clock periods */
        __le32 cca_cck;         /* cca fraction time in 44Mhz clock periods */
        __le32 cca_time;        /* channel load time in usecs */
        u8 basic_type;          /* 0 - bss, 1 - ofdm preamble, 2 -
                                 * unidentified */
        u8 reserved2[3];
        struct iwl4965_measurement_histogram histogram;
        __le32 stop_time;       /* lower 32-bits of TSF */
        __le32 status;          /* see iwl4965_measurement_status */
} __attribute__ ((packed));

/******************************************************************************
 * (7)
 * Power Management Commands, Responses, Notifications:
 *
 *****************************************************************************/

/**
 * struct iwl4965_powertable_cmd - Power Table Command
 * @flags: See below:
 *
 * POWER_TABLE_CMD = 0x77 (command, has simple generic response)
 *
 * PM allow:
 *   bit 0 - '0' Driver not allow power management
 *           '1' Driver allow PM (use rest of parameters)
 * uCode send sleep notifications:
 *   bit 1 - '0' Don't send sleep notification
 *           '1' send sleep notification (SEND_PM_NOTIFICATION)
 * Sleep over DTIM
 *   bit 2 - '0' PM have to walk up every DTIM
 *           '1' PM could sleep over DTIM till listen Interval.
 * PCI power managed
 *   bit 3 - '0' (PCI_LINK_CTRL & 0x1)
 *           '1' !(PCI_LINK_CTRL & 0x1)
 * Force sleep Modes
 *   bit 31/30- '00' use both mac/xtal sleeps
 *              '01' force Mac sleep
 *              '10' force xtal sleep
 *              '11' Illegal set
 *
 * NOTE: if sleep_interval[SLEEP_INTRVL_TABLE_SIZE-1] > DTIM period then
 * ucode assume sleep over DTIM is allowed and we don't need to wakeup
 * for every DTIM.
 */
#define IWL_POWER_VEC_SIZE 5

#define IWL_POWER_DRIVER_ALLOW_SLEEP_MSK        __constant_cpu_to_le16(1 << 0)
#define IWL_POWER_SLEEP_OVER_DTIM_MSK           __constant_cpu_to_le16(1 << 2)
#define IWL_POWER_PCI_PM_MSK                    __constant_cpu_to_le16(1 << 3)

struct iwl4965_powertable_cmd {
        __le16 flags;
        u8 keep_alive_seconds;
        u8 debug_flags;
        __le32 rx_data_timeout;
        __le32 tx_data_timeout;
        __le32 sleep_interval[IWL_POWER_VEC_SIZE];
        __le32 keep_alive_beacons;
} __attribute__ ((packed));

/*
 * PM_SLEEP_NOTIFICATION = 0x7A (notification only, not a command)
 * 3945 and 4965 identical.
 */
struct iwl4965_sleep_notification {
        u8 pm_sleep_mode;
        u8 pm_wakeup_src;
        __le16 reserved;
        __le32 sleep_time;
        __le32 tsf_low;
        __le32 bcon_timer;
} __attribute__ ((packed));

/* Sleep states.  3945 and 4965 identical. */
enum {
        IWL_PM_NO_SLEEP = 0,
        IWL_PM_SLP_MAC = 1,
        IWL_PM_SLP_FULL_MAC_UNASSOCIATE = 2,
        IWL_PM_SLP_FULL_MAC_CARD_STATE = 3,
        IWL_PM_SLP_PHY = 4,
        IWL_PM_SLP_REPENT = 5,
        IWL_PM_WAKEUP_BY_TIMER = 6,
        IWL_PM_WAKEUP_BY_DRIVER = 7,
        IWL_PM_WAKEUP_BY_RFKILL = 8,
        /* 3 reserved */
        IWL_PM_NUM_OF_MODES = 12,
};

/*
 * REPLY_CARD_STATE_CMD = 0xa0 (command, has simple generic response)
 */
#define CARD_STATE_CMD_DISABLE 0x00     /* Put card to sleep */
#define CARD_STATE_CMD_ENABLE  0x01     /* Wake up card */
#define CARD_STATE_CMD_HALT    0x02     /* Power down permanently */
struct iwl4965_card_state_cmd {
        __le32 status;          /* CARD_STATE_CMD_* request new power state */
} __attribute__ ((packed));

/*
 * CARD_STATE_NOTIFICATION = 0xa1 (notification only, not a command)
 */
struct iwl4965_card_state_notif {
        __le32 flags;
} __attribute__ ((packed));

#define HW_CARD_DISABLED   0x01
#define SW_CARD_DISABLED   0x02
#define RF_CARD_DISABLED   0x04
#define RXON_CARD_DISABLED 0x10

struct iwl4965_ct_kill_config {
        __le32   reserved;
        __le32   critical_temperature_M;
        __le32   critical_temperature_R;
}  __attribute__ ((packed));

/******************************************************************************
 * (8)
 * Scan Commands, Responses, Notifications:
 *
 *****************************************************************************/

/**
 * struct iwl4965_scan_channel - entry in REPLY_SCAN_CMD channel table
 *
 * One for each channel in the scan list.
 * Each channel can independently select:
 * 1)  SSID for directed active scans
 * 2)  Txpower setting (for rate specified within Tx command)
 * 3)  How long to stay on-channel (behavior may be modified by quiet_time,
 *     quiet_plcp_th, good_CRC_th)
 *
 * To avoid uCode errors, make sure the following are true (see comments
 * under struct iwl4965_scan_cmd about max_out_time and quiet_time):
 * 1)  If using passive_dwell (i.e. passive_dwell != 0):
 *     active_dwell <= passive_dwell (< max_out_time if max_out_time != 0)
 * 2)  quiet_time <= active_dwell
 * 3)  If restricting off-channel time (i.e. max_out_time !=0):
 *     passive_dwell < max_out_time
 *     active_dwell < max_out_time
 */
struct iwl4965_scan_channel {
        /*
         * type is defined as:
         * 0:0 1 = active, 0 = passive
         * 1:4 SSID direct bit map; if a bit is set, then corresponding
         *     SSID IE is transmitted in probe request.
         * 5:7 reserved
         */
        u8 type;
        u8 channel;     /* band is selected by iwl4965_scan_cmd "flags" field */
        struct iwl4965_tx_power tpc;
        __le16 active_dwell;    /* in 1024-uSec TU (time units), typ 5-50 */
        __le16 passive_dwell;   /* in 1024-uSec TU (time units), typ 20-500 */
} __attribute__ ((packed));

/**
 * struct iwl4965_ssid_ie - directed scan network information element
 *
 * Up to 4 of these may appear in REPLY_SCAN_CMD, selected by "type" field
 * in struct iwl4965_scan_channel; each channel may select different ssids from
 * among the 4 entries.  SSID IEs get transmitted in reverse order of entry.
 */
struct iwl4965_ssid_ie {
        u8 id;
        u8 len;
        u8 ssid[32];
} __attribute__ ((packed));

#define PROBE_OPTION_MAX        0x4
#define TX_CMD_LIFE_TIME_INFINITE       __constant_cpu_to_le32(0xFFFFFFFF)
#define IWL_GOOD_CRC_TH         __constant_cpu_to_le16(1)
#define IWL_MAX_SCAN_SIZE 1024

/*
 * REPLY_SCAN_CMD = 0x80 (command)
 *
 * The hardware scan command is very powerful; the driver can set it up to
 * maintain (relatively) normal network traffic while doing a scan in the
 * background.  The max_out_time and suspend_time control the ratio of how
 * long the device stays on an associated network channel ("service channel")
 * vs. how long it's away from the service channel, i.e. tuned to other channels
 * for scanning.
 *
 * max_out_time is the max time off-channel (in usec), and suspend_time
 * is how long (in "extended beacon" format) that the scan is "suspended"
 * after returning to the service channel.  That is, suspend_time is the
 * time that we stay on the service channel, doing normal work, between
 * scan segments.  The driver may set these parameters differently to support
 * scanning when associated vs. not associated, and light vs. heavy traffic
 * loads when associated.
 *
 * After receiving this command, the device's scan engine does the following;
 *
 * 1)  Sends SCAN_START notification to driver
 * 2)  Checks to see if it has time to do scan for one channel
 * 3)  Sends NULL packet, with power-save (PS) bit set to 1,
 *     to tell AP that we're going off-channel
 * 4)  Tunes to first channel in scan list, does active or passive scan
 * 5)  Sends SCAN_RESULT notification to driver
 * 6)  Checks to see if it has time to do scan on *next* channel in list
 * 7)  Repeats 4-6 until it no longer has time to scan the next channel
 *     before max_out_time expires
 * 8)  Returns to service channel
 * 9)  Sends NULL packet with PS=0 to tell AP that we're back
 * 10) Stays on service channel until suspend_time expires
 * 11) Repeats entire process 2-10 until list is complete
 * 12) Sends SCAN_COMPLETE notification
 *
 * For fast, efficient scans, the scan command also has support for staying on
 * a channel for just a short time, if doing active scanning and getting no
 * responses to the transmitted probe request.  This time is controlled by
 * quiet_time, and the number of received packets below which a channel is
 * considered "quiet" is controlled by quiet_plcp_threshold.
 *
 * For active scanning on channels that have regulatory restrictions against
 * blindly transmitting, the scan can listen before transmitting, to make sure
 * that there is already legitimate activity on the channel.  If enough
 * packets are cleanly received on the channel (controlled by good_CRC_th,
 * typical value 1), the scan engine starts transmitting probe requests.
 *
 * Driver must use separate scan commands for 2.4 vs. 5 GHz bands.
 *
 * To avoid uCode errors, see timing restrictions described under
 * struct iwl4965_scan_channel.
 */
struct iwl4965_scan_cmd {
        __le16 len;
        u8 reserved0;
        u8 channel_count;       /* # channels in channel list */
        __le16 quiet_time;      /* dwell only this # millisecs on quiet channel
                                 * (only for active scan) */
        __le16 quiet_plcp_th;   /* quiet chnl is < this # pkts (typ. 1) */
        __le16 good_CRC_th;     /* passive -> active promotion threshold */
        __le16 rx_chain;        /* RXON_RX_CHAIN_* */
        __le32 max_out_time;    /* max usec to be away from associated (service)
                                 * channel */
        __le32 suspend_time;    /* pause scan this long (in "extended beacon
                                 * format") when returning to service chnl:
                                 * 3945; 31:24 # beacons, 19:0 additional usec,
                                 * 4965; 31:22 # beacons, 21:0 additional usec.
                                 */
        __le32 flags;           /* RXON_FLG_* */
        __le32 filter_flags;    /* RXON_FILTER_* */

        /* For active scans (set to all-0s for passive scans).
         * Does not include payload.  Must specify Tx rate; no rate scaling. */
        struct iwl4965_tx_cmd tx_cmd;

        /* For directed active scans (set to all-0s otherwise) */
        struct iwl4965_ssid_ie direct_scan[PROBE_OPTION_MAX];

        /*
         * Probe request frame, followed by channel list.
         *
         * Size of probe request frame is specified by byte count in tx_cmd.
         * Channel list follows immediately after probe request frame.
         * Number of channels in list is specified by channel_count.
         * Each channel in list is of type:
         *
         * struct iwl4965_scan_channel channels[0];
         *
         * NOTE:  Only one band of channels can be scanned per pass.  You
         * must not mix 2.4GHz channels and 5.2GHz channels, and you must wait
         * for one scan to complete (i.e. receive SCAN_COMPLETE_NOTIFICATION)
         * before requesting another scan.
         */
        u8 data[0];
} __attribute__ ((packed));

/* Can abort will notify by complete notification with abort status. */
#define CAN_ABORT_STATUS        __constant_cpu_to_le32(0x1)
/* complete notification statuses */
#define ABORT_STATUS            0x2

/*
 * REPLY_SCAN_CMD = 0x80 (response)
 */
struct iwl4965_scanreq_notification {
        __le32 status;          /* 1: okay, 2: cannot fulfill request */
} __attribute__ ((packed));

/*
 * SCAN_START_NOTIFICATION = 0x82 (notification only, not a command)
 */
struct iwl4965_scanstart_notification {
        __le32 tsf_low;
        __le32 tsf_high;
        __le32 beacon_timer;
        u8 channel;
        u8 band;
        u8 reserved[2];
        __le32 status;
} __attribute__ ((packed));

#define  SCAN_OWNER_STATUS 0x1;
#define  MEASURE_OWNER_STATUS 0x2;

#define NUMBER_OF_STATISTICS 1  /* first __le32 is good CRC */
/*
 * SCAN_RESULTS_NOTIFICATION = 0x83 (notification only, not a command)
 */
struct iwl4965_scanresults_notification {
        u8 channel;
        u8 band;
        u8 reserved[2];
        __le32 tsf_low;
        __le32 tsf_high;
        __le32 statistics[NUMBER_OF_STATISTICS];
} __attribute__ ((packed));

/*
 * SCAN_COMPLETE_NOTIFICATION = 0x84 (notification only, not a command)
 */
struct iwl4965_scancomplete_notification {
        u8 scanned_channels;
        u8 status;
        u8 reserved;
        u8 last_channel;
        __le32 tsf_low;
        __le32 tsf_high;
} __attribute__ ((packed));


/******************************************************************************
 * (9)
 * IBSS/AP Commands and Notifications:
 *
 *****************************************************************************/

/*
 * BEACON_NOTIFICATION = 0x90 (notification only, not a command)
 */
struct iwl4965_beacon_notif {
        struct iwl4965_tx_resp beacon_notify_hdr;
        __le32 low_tsf;
        __le32 high_tsf;
        __le32 ibss_mgr_status;
} __attribute__ ((packed));

/*
 * REPLY_TX_BEACON = 0x91 (command, has simple generic response)
 */
struct iwl4965_tx_beacon_cmd {
        struct iwl4965_tx_cmd tx;
        __le16 tim_idx;
        u8 tim_size;
        u8 reserved1;
        struct ieee80211_hdr frame[0];  /* beacon frame */
} __attribute__ ((packed));

/******************************************************************************
 * (10)
 * Statistics Commands and Notifications:
 *
 *****************************************************************************/

#define IWL_TEMP_CONVERT 260

#define SUP_RATE_11A_MAX_NUM_CHANNELS  8
#define SUP_RATE_11B_MAX_NUM_CHANNELS  4
#define SUP_RATE_11G_MAX_NUM_CHANNELS  12

/* Used for passing to driver number of successes and failures per rate */
struct rate_histogram {
        union {
                __le32 a[SUP_RATE_11A_MAX_NUM_CHANNELS];
                __le32 b[SUP_RATE_11B_MAX_NUM_CHANNELS];
                __le32 g[SUP_RATE_11G_MAX_NUM_CHANNELS];
        } success;
        union {
                __le32 a[SUP_RATE_11A_MAX_NUM_CHANNELS];
                __le32 b[SUP_RATE_11B_MAX_NUM_CHANNELS];
                __le32 g[SUP_RATE_11G_MAX_NUM_CHANNELS];
        } failed;
} __attribute__ ((packed));

/* statistics command response */

struct statistics_rx_phy {
        __le32 ina_cnt;
        __le32 fina_cnt;
        __le32 plcp_err;
        __le32 crc32_err;
        __le32 overrun_err;
        __le32 early_overrun_err;
        __le32 crc32_good;
        __le32 false_alarm_cnt;
        __le32 fina_sync_err_cnt;
        __le32 sfd_timeout;
        __le32 fina_timeout;
        __le32 unresponded_rts;
        __le32 rxe_frame_limit_overrun;
        __le32 sent_ack_cnt;
        __le32 sent_cts_cnt;
        __le32 sent_ba_rsp_cnt;
        __le32 dsp_self_kill;
        __le32 mh_format_err;
        __le32 re_acq_main_rssi_sum;
        __le32 reserved3;
} __attribute__ ((packed));

struct statistics_rx_ht_phy {
        __le32 plcp_err;
        __le32 overrun_err;
        __le32 early_overrun_err;
        __le32 crc32_good;
        __le32 crc32_err;
        __le32 mh_format_err;
        __le32 agg_crc32_good;
        __le32 agg_mpdu_cnt;
        __le32 agg_cnt;
        __le32 reserved2;
} __attribute__ ((packed));

struct statistics_rx_non_phy {
        __le32 bogus_cts;       /* CTS received when not expecting CTS */
        __le32 bogus_ack;       /* ACK received when not expecting ACK */
        __le32 non_bssid_frames;        /* number of frames with BSSID that
                                         * doesn't belong to the STA BSSID */
        __le32 filtered_frames; /* count frames that were dumped in the
                                 * filtering process */
        __le32 non_channel_beacons;     /* beacons with our bss id but not on
                                         * our serving channel */
        __le32 channel_beacons; /* beacons with our bss id and in our
                                 * serving channel */
        __le32 num_missed_bcon; /* number of missed beacons */
        __le32 adc_rx_saturation_time;  /* count in 0.8us units the time the
                                         * ADC was in saturation */
        __le32 ina_detection_search_time;/* total time (in 0.8us) searched
                                          * for INA */
        __le32 beacon_silence_rssi_a;   /* RSSI silence after beacon frame */
        __le32 beacon_silence_rssi_b;   /* RSSI silence after beacon frame */
        __le32 beacon_silence_rssi_c;   /* RSSI silence after beacon frame */
        __le32 interference_data_flag;  /* flag for interference data
                                         * availability. 1 when data is
                                         * available. */
        __le32 channel_load;            /* counts RX Enable time in uSec */
        __le32 dsp_false_alarms;        /* DSP false alarm (both OFDM
                                         * and CCK) counter */
        __le32 beacon_rssi_a;
        __le32 beacon_rssi_b;
        __le32 beacon_rssi_c;
        __le32 beacon_energy_a;
        __le32 beacon_energy_b;
        __le32 beacon_energy_c;
} __attribute__ ((packed));

struct statistics_rx {
        struct statistics_rx_phy ofdm;
        struct statistics_rx_phy cck;
        struct statistics_rx_non_phy general;
        struct statistics_rx_ht_phy ofdm_ht;
} __attribute__ ((packed));

struct statistics_tx_non_phy_agg {
        __le32 ba_timeout;
        __le32 ba_reschedule_frames;
        __le32 scd_query_agg_frame_cnt;
        __le32 scd_query_no_agg;
        __le32 scd_query_agg;
        __le32 scd_query_mismatch;
        __le32 frame_not_ready;
        __le32 underrun;
        __le32 bt_prio_kill;
        __le32 rx_ba_rsp_cnt;
        __le32 reserved2;
        __le32 reserved3;
} __attribute__ ((packed));

struct statistics_tx {
        __le32 preamble_cnt;
        __le32 rx_detected_cnt;
        __le32 bt_prio_defer_cnt;
        __le32 bt_prio_kill_cnt;
        __le32 few_bytes_cnt;
        __le32 cts_timeout;
        __le32 ack_timeout;
        __le32 expected_ack_cnt;
        __le32 actual_ack_cnt;
        __le32 dump_msdu_cnt;
        __le32 burst_abort_next_frame_mismatch_cnt;
        __le32 burst_abort_missing_next_frame_cnt;
        __le32 cts_timeout_collision;
        __le32 ack_or_ba_timeout_collision;
        struct statistics_tx_non_phy_agg agg;
} __attribute__ ((packed));

struct statistics_dbg {
        __le32 burst_check;
        __le32 burst_count;
        __le32 reserved[4];
} __attribute__ ((packed));

struct statistics_div {
        __le32 tx_on_a;
        __le32 tx_on_b;
        __le32 exec_time;
        __le32 probe_time;
        __le32 reserved1;
        __le32 reserved2;
} __attribute__ ((packed));

struct statistics_general {
        __le32 temperature;
        __le32 temperature_m;
        struct statistics_dbg dbg;
        __le32 sleep_time;
        __le32 slots_out;
        __le32 slots_idle;
        __le32 ttl_timestamp;
        struct statistics_div div;
        __le32 rx_enable_counter;
        __le32 reserved1;
        __le32 reserved2;
        __le32 reserved3;
} __attribute__ ((packed));

/*
 * REPLY_STATISTICS_CMD = 0x9c,
 * 3945 and 4965 identical.
 *
 * This command triggers an immediate response containing uCode statistics.
 * The response is in the same format as STATISTICS_NOTIFICATION 0x9d, below.
 *
 * If the CLEAR_STATS configuration flag is set, uCode will clear its
 * internal copy of the statistics (counters) after issuing the response.
 * This flag does not affect STATISTICS_NOTIFICATIONs after beacons (see below).
 *
 * If the DISABLE_NOTIF configuration flag is set, uCode will not issue
 * STATISTICS_NOTIFICATIONs after received beacons (see below).  This flag
 * does not affect the response to the REPLY_STATISTICS_CMD 0x9c itself.
 */
#define IWL_STATS_CONF_CLEAR_STATS __constant_cpu_to_le32(0x1)  /* see above */
#define IWL_STATS_CONF_DISABLE_NOTIF __constant_cpu_to_le32(0x2)/* see above */
struct iwl4965_statistics_cmd {
        __le32 configuration_flags;     /* IWL_STATS_CONF_* */
} __attribute__ ((packed));

/*
 * STATISTICS_NOTIFICATION = 0x9d (notification only, not a command)
 *
 * By default, uCode issues this notification after receiving a beacon
 * while associated.  To disable this behavior, set DISABLE_NOTIF flag in the
 * REPLY_STATISTICS_CMD 0x9c, above.
 *
 * Statistics counters continue to increment beacon after beacon, but are
 * cleared when changing channels or when driver issues REPLY_STATISTICS_CMD
 * 0x9c with CLEAR_STATS bit set (see above).
 *
 * uCode also issues this notification during scans.  uCode clears statistics
 * appropriately so that each notification contains statistics for only the
 * one channel that has just been scanned.
 */
#define STATISTICS_REPLY_FLG_BAND_24G_MSK         __constant_cpu_to_le32(0x2)
#define STATISTICS_REPLY_FLG_FAT_MODE_MSK         __constant_cpu_to_le32(0x8)
struct iwl4965_notif_statistics {
        __le32 flag;
        struct statistics_rx rx;
        struct statistics_tx tx;
        struct statistics_general general;
} __attribute__ ((packed));


/*
 * MISSED_BEACONS_NOTIFICATION = 0xa2 (notification only, not a command)
 */
/* if ucode missed CONSECUTIVE_MISSED_BCONS_TH beacons in a row,
 * then this notification will be sent. */
#define CONSECUTIVE_MISSED_BCONS_TH 20

struct iwl4965_missed_beacon_notif {
        __le32 consequtive_missed_beacons;
        __le32 total_missed_becons;
        __le32 num_expected_beacons;
        __le32 num_recvd_beacons;
} __attribute__ ((packed));


/******************************************************************************
 * (11)
 * Rx Calibration Commands:
 *
 * With the uCode used for open source drivers, most Tx calibration (except
 * for Tx Power) and most Rx calibration is done by uCode during the
 * "initialize" phase of uCode boot.  Driver must calibrate only:
 *
 * 1)  Tx power (depends on temperature), described elsewhere
 * 2)  Receiver gain balance (optimize MIMO, and detect disconnected antennas)
 * 3)  Receiver sensitivity (to optimize signal detection)
 *
 *****************************************************************************/

/**
 * SENSITIVITY_CMD = 0xa8 (command, has simple generic response)
 *
 * This command sets up the Rx signal detector for a sensitivity level that
 * is high enough to lock onto all signals within the associated network,
 * but low enough to ignore signals that are below a certain threshold, so as
 * not to have too many "false alarms".  False alarms are signals that the
 * Rx DSP tries to lock onto, but then discards after determining that they
 * are noise.
 *
 * The optimum number of false alarms is between 5 and 50 per 200 TUs
 * (200 * 1024 uSecs, i.e. 204.8 milliseconds) of actual Rx time (i.e.
 * time listening, not transmitting).  Driver must adjust sensitivity so that
 * the ratio of actual false alarms to actual Rx time falls within this range.
 *
 * While associated, uCode delivers STATISTICS_NOTIFICATIONs after each
 * received beacon.  These provide information to the driver to analyze the
 * sensitivity.  Don't analyze statistics that come in from scanning, or any
 * other non-associated-network source.  Pertinent statistics include:
 *
 * From "general" statistics (struct statistics_rx_non_phy):
 *
 * (beacon_energy_[abc] & 0x0FF00) >> 8 (unsigned, higher value is lower level)
 *   Measure of energy of desired signal.  Used for establishing a level
 *   below which the device does not detect signals.
 *
 * (beacon_silence_rssi_[abc] & 0x0FF00) >> 8 (unsigned, units in dB)
 *   Measure of background noise in silent period after beacon.
 *
 * channel_load
 *   uSecs of actual Rx time during beacon period (varies according to
 *   how much time was spent transmitting).
 *
 * From "cck" and "ofdm" statistics (struct statistics_rx_phy), separately:
 *
 * false_alarm_cnt
 *   Signal locks abandoned early (before phy-level header).
 *
 * plcp_err
 *   Signal locks abandoned late (during phy-level header).
 *
 * NOTE:  Both false_alarm_cnt and plcp_err increment monotonically from
 *        beacon to beacon, i.e. each value is an accumulation of all errors
 *        before and including the latest beacon.  Values will wrap around to 0
 *        after counting up to 2^32 - 1.  Driver must differentiate vs.
 *        previous beacon's values to determine # false alarms in the current
 *        beacon period.
 *
 * Total number of false alarms = false_alarms + plcp_errs
 *
 * For OFDM, adjust the following table entries in struct iwl_sensitivity_cmd
 * (notice that the start points for OFDM are at or close to settings for
 * maximum sensitivity):
 *
 *                                             START  /  MIN  /  MAX
 *   HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX          90   /   85  /  120
 *   HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX     170   /  170  /  210
 *   HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX         105   /  105  /  140
 *   HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX     220   /  220  /  270
 *
 *   If actual rate of OFDM false alarms (+ plcp_errors) is too high
 *   (greater than 50 for each 204.8 msecs listening), reduce sensitivity
 *   by *adding* 1 to all 4 of the table entries above, up to the max for
 *   each entry.  Conversely, if false alarm rate is too low (less than 5
 *   for each 204.8 msecs listening), *subtract* 1 from each entry to
 *   increase sensitivity.
 *
 * For CCK sensitivity, keep track of the following:
 *
 *   1).  20-beacon history of maximum background noise, indicated by
 *        (beacon_silence_rssi_[abc] & 0x0FF00), units in dB, across the
 *        3 receivers.  For any given beacon, the "silence reference" is
 *        the maximum of last 60 samples (20 beacons * 3 receivers).
 *
 *   2).  10-beacon history of strongest signal level, as indicated
 *        by (beacon_energy_[abc] & 0x0FF00) >> 8, across the 3 receivers,
 *        i.e. the strength of the signal through the best receiver at the
 *        moment.  These measurements are "upside down", with lower values
 *        for stronger signals, so max energy will be *minimum* value.
 *
 *        Then for any given beacon, the driver must determine the *weakest*
 *        of the strongest signals; this is the minimum level that needs to be
 *        successfully detected, when using the best receiver at the moment.
 *        "Max cck energy" is the maximum (higher value means lower energy!)
 *        of the last 10 minima.  Once this is determined, driver must add
 *        a little margin by adding "6" to it.
 *
 *   3).  Number of consecutive beacon periods with too few false alarms.
 *        Reset this to 0 at the first beacon period that falls within the
 *        "good" range (5 to 50 false alarms per 204.8 milliseconds rx).
 *
 * Then, adjust the following CCK table entries in struct iwl_sensitivity_cmd
 * (notice that the start points for CCK are at maximum sensitivity):
 *
 *                                             START  /  MIN  /  MAX
 *   HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX         125   /  125  /  200
 *   HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX     200   /  200  /  400
 *   HD_MIN_ENERGY_CCK_DET_INDEX                100   /    0  /  100
 *
 *   If actual rate of CCK false alarms (+ plcp_errors) is too high
 *   (greater than 50 for each 204.8 msecs listening), method for reducing
 *   sensitivity is:
 *
 *   1)  *Add* 3 to value in HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX,
 *       up to max 400.
 *
 *   2)  If current value in HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX is < 160,
 *       sensitivity has been reduced a significant amount; bring it up to
 *       a moderate 161.  Otherwise, *add* 3, up to max 200.
 *
 *   3)  a)  If current value in HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX is > 160,
 *       sensitivity has been reduced only a moderate or small amount;
 *       *subtract* 2 from value in HD_MIN_ENERGY_CCK_DET_INDEX,
 *       down to min 0.  Otherwise (if gain has been significantly reduced),
 *       don't change the HD_MIN_ENERGY_CCK_DET_INDEX value.
 *
 *       b)  Save a snapshot of the "silence reference".
 *
 *   If actual rate of CCK false alarms (+ plcp_errors) is too low
 *   (less than 5 for each 204.8 msecs listening), method for increasing
 *   sensitivity is used only if:
 *
 *   1a)  Previous beacon did not have too many false alarms
 *   1b)  AND difference between previous "silence reference" and current
 *        "silence reference" (prev - current) is 2 or more,
 *   OR 2)  100 or more consecutive beacon periods have had rate of
 *          less than 5 false alarms per 204.8 milliseconds rx time.
 *
 *   Method for increasing sensitivity:
 *
 *   1)  *Subtract* 3 from value in HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX,
 *       down to min 125.
 *
 *   2)  *Subtract* 3 from value in HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX,
 *       down to min 200.
 *
 *   3)  *Add* 2 to value in HD_MIN_ENERGY_CCK_DET_INDEX, up to max 100.
 *
 *   If actual rate of CCK false alarms (+ plcp_errors) is within good range
 *   (between 5 and 50 for each 204.8 msecs listening):
 *
 *   1)  Save a snapshot of the silence reference.
 *
 *   2)  If previous beacon had too many CCK false alarms (+ plcp_errors),
 *       give some extra margin to energy threshold by *subtracting* 8
 *       from value in HD_MIN_ENERGY_CCK_DET_INDEX.
 *
 *   For all cases (too few, too many, good range), make sure that the CCK
 *   detection threshold (energy) is below the energy level for robust
 *   detection over the past 10 beacon periods, the "Max cck energy".
 *   Lower values mean higher energy; this means making sure that the value
 *   in HD_MIN_ENERGY_CCK_DET_INDEX is at or *above* "Max cck energy".
 *
 * Driver should set the following entries to fixed values:
 *
 *   HD_MIN_ENERGY_OFDM_DET_INDEX               100
 *   HD_BARKER_CORR_TH_ADD_MIN_INDEX            190
 *   HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX        390
 *   HD_OFDM_ENERGY_TH_IN_INDEX                  62
 */

/*
 * Table entries in SENSITIVITY_CMD (struct iwl4965_sensitivity_cmd)
 */
#define HD_TABLE_SIZE  (11)     /* number of entries */
#define HD_MIN_ENERGY_CCK_DET_INDEX                 (0) /* table indexes */
#define HD_MIN_ENERGY_OFDM_DET_INDEX                (1)
#define HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX          (2)
#define HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX      (3)
#define HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX      (4)
#define HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX          (5)
#define HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX      (6)
#define HD_BARKER_CORR_TH_ADD_MIN_INDEX             (7)
#define HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX         (8)
#define HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX          (9)
#define HD_OFDM_ENERGY_TH_IN_INDEX                  (10)

/* Control field in struct iwl4965_sensitivity_cmd */
#define SENSITIVITY_CMD_CONTROL_DEFAULT_TABLE   __constant_cpu_to_le16(0)
#define SENSITIVITY_CMD_CONTROL_WORK_TABLE      __constant_cpu_to_le16(1)

/**
 * struct iwl4965_sensitivity_cmd
 * @control:  (1) updates working table, (0) updates default table
 * @table:  energy threshold values, use HD_* as index into table
 *
 * Always use "1" in "control" to update uCode's working table and DSP.
 */
struct iwl4965_sensitivity_cmd {
        __le16 control;                 /* always use "1" */
        __le16 table[HD_TABLE_SIZE];    /* use HD_* as index */
} __attribute__ ((packed));


/**
 * REPLY_PHY_CALIBRATION_CMD = 0xb0 (command, has simple generic response)
 *
 * This command sets the relative gains of 4965's 3 radio receiver chains.
 *
 * After the first association, driver should accumulate signal and noise
 * statistics from the STATISTICS_NOTIFICATIONs that follow the first 20
 * beacons from the associated network (don't collect statistics that come
 * in from scanning, or any other non-network source).
 *
 * DISCONNECTED ANTENNA:
 *
 * Driver should determine which antennas are actually connected, by comparing
 * average beacon signal levels for the 3 Rx chains.  Accumulate (add) the
 * following values over 20 beacons, one accumulator for each of the chains
 * a/b/c, from struct statistics_rx_non_phy:
 *
 * beacon_rssi_[abc] & 0x0FF (unsigned, units in dB)
 *
 * Find the strongest signal from among a/b/c.  Compare the other two to the
 * strongest.  If any signal is more than 15 dB (times 20, unless you
 * divide the accumulated values by 20) below the strongest, the driver
 * considers that antenna to be disconnected, and should not try to use that
 * antenna/chain for Rx or Tx.  If both A and B seem to be disconnected,
 * driver should declare the stronger one as connected, and attempt to use it
 * (A and B are the only 2 Tx chains!).
 *
 *
 * RX BALANCE:
 *
 * Driver should balance the 3 receivers (but just the ones that are connected
 * to antennas, see above) for gain, by comparing the average signal levels
 * detected during the silence after each beacon (background noise).
 * Accumulate (add) the following values over 20 beacons, one accumulator for
 * each of the chains a/b/c, from struct statistics_rx_non_phy:
 *
 * beacon_silence_rssi_[abc] & 0x0FF (unsigned, units in dB)
 *
 * Find the weakest background noise level from among a/b/c.  This Rx chain
 * will be the reference, with 0 gain adjustment.  Attenuate other channels by
 * finding noise difference:
 *
 * (accum_noise[i] - accum_noise[reference]) / 30
 *
 * The "30" adjusts the dB in the 20 accumulated samples to units of 1.5 dB.
 * For use in diff_gain_[abc] fields of struct iwl_calibration_cmd, the
 * driver should limit the difference results to a range of 0-3 (0-4.5 dB),
 * and set bit 2 to indicate "reduce gain".  The value for the reference
 * (weakest) chain should be "0".
 *
 * diff_gain_[abc] bit fields:
 *   2: (1) reduce gain, (0) increase gain
 * 1-0: amount of gain, units of 1.5 dB
 */

/* "Differential Gain" opcode used in REPLY_PHY_CALIBRATION_CMD. */
#define PHY_CALIBRATE_DIFF_GAIN_CMD (7)

struct iwl4965_calibration_cmd {
        u8 opCode;              /* PHY_CALIBRATE_DIFF_GAIN_CMD (7) */
        u8 flags;               /* not used */
        __le16 reserved;
        s8 diff_gain_a;         /* see above */
        s8 diff_gain_b;
        s8 diff_gain_c;
        u8 reserved1;
} __attribute__ ((packed));

/******************************************************************************
 * (12)
 * Miscellaneous Commands:
 *
 *****************************************************************************/

/*
 * LEDs Command & Response
 * REPLY_LEDS_CMD = 0x48 (command, has simple generic response)
 *
 * For each of 3 possible LEDs (Activity/Link/Tech, selected by "id" field),
 * this command turns it on or off, or sets up a periodic blinking cycle.
 */
struct iwl4965_led_cmd {
        __le32 interval;        /* "interval" in uSec */
        u8 id;                  /* 1: Activity, 2: Link, 3: Tech */
        u8 off;                 /* # intervals off while blinking;
                                 * "0", with >0 "on" value, turns LED on */
        u8 on;                  /* # intervals on while blinking;
                                 * "0", regardless of "off", turns LED off */
        u8 reserved;
} __attribute__ ((packed));

/******************************************************************************
 * (13)
 * Union of all expected notifications/responses:
 *
 *****************************************************************************/

struct iwl4965_rx_packet {
        __le32 len;
        struct iwl4965_cmd_header hdr;
        union {
                struct iwl4965_alive_resp alive_frame;
                struct iwl4965_rx_frame rx_frame;
                struct iwl4965_tx_resp tx_resp;
                struct iwl4965_spectrum_notification spectrum_notif;
                struct iwl4965_csa_notification csa_notif;
                struct iwl4965_error_resp err_resp;
                struct iwl4965_card_state_notif card_state_notif;
                struct iwl4965_beacon_notif beacon_status;
                struct iwl4965_add_sta_resp add_sta;
                struct iwl4965_sleep_notification sleep_notif;
                struct iwl4965_spectrum_resp spectrum;
                struct iwl4965_notif_statistics stats;
                struct iwl4965_compressed_ba_resp compressed_ba;
                struct iwl4965_missed_beacon_notif missed_beacon;
                __le32 status;
                u8 raw[0];
        } u;
} __attribute__ ((packed));

#define IWL_RX_FRAME_SIZE        (4 + sizeof(struct iwl4965_rx_frame))

#endif                          /* __iwl4965_commands_h__ */