ar9300_radar.c

/*
 * Copyright (c) 2013 Qualcomm Atheros, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */


#include "opt_ah.h"

#include "ah.h"
#include "ah_desc.h"
#include "ah_internal.h"

#include "ar9300/ar9300.h"
#include "ar9300/ar9300phy.h"
#include "ar9300/ar9300reg.h"

/*
 * Default 5413/9300 radar phy parameters
 * Values adjusted to fix EV76432/EV76320
 */
#define AR9300_DFS_FIRPWR   -28
#define AR9300_DFS_RRSSI    0
#define AR9300_DFS_HEIGHT   10
#define AR9300_DFS_PRSSI    6 
#define AR9300_DFS_INBAND   8
#define AR9300_DFS_RELPWR   8
#define AR9300_DFS_RELSTEP  12
#define AR9300_DFS_MAXLEN   255

/*
 * This PRSSI value should be used during CAC.
 */
#define AR9300_DFS_PRSSI_CAC 10 

/*
 *  make sure that value matches value in ar9300_osprey_2p2_mac_core[][2]
 *  for register 0x1040 to 0x104c
*/
#define AR9300_DEFAULT_DIFS     0x002ffc0f
#define AR9300_FCC_RADARS_FCC_OFFSET 4

struct dfs_pulse ar9300_etsi_radars[] = {

    /* for short pulses, RSSI threshold should be smaller than
 * Kquick-drop. The chip has only one chance to drop the gain which
 * will be reported as the estimated RSSI */

    /* TYPE staggered pulse */
    /* 0.8-2us, 2-3 bursts,300-400 PRF, 10 pulses each */
    {30,  2,  300,  400, 2, 30,  3,  0,  5, 15, 0,   0, 1, 31},   /* Type 5*/
    /* 0.8-2us, 2-3 bursts, 400-1200 PRF, 15 pulses each */
    {30,  2,  400, 1200, 2, 30,  7,  0,  5, 15, 0,   0, 0, 32},   /* Type 6 */

    /* constant PRF based */
    /* 0.8-5us, 200  300 PRF, 10 pulses */
    {10, 5,   200,  400, 0, 24,  5,  0,  8, 15, 0,   0, 2, 33},   /* Type 1 */
    {10, 5,   400,  600, 0, 24,  5,  0,  8, 15, 0,   0, 2, 37},   /* Type 1 */
    {10, 5,   600,  800, 0, 24,  5,  0,  8, 15, 0,   0, 2, 38},   /* Type 1 */
    {10, 5,   800, 1000, 0, 24,  5,  0,  8, 15, 0,   0, 2, 39},   /* Type 1 */
//  {10, 5,   200, 1000, 0, 24,  5,  0,  8, 15, 0,   0, 2, 33},

    /* 0.8-15us, 200-1600 PRF, 15 pulses */
    {15, 15,  200, 1600, 0, 24, 8,  0, 18, 24, 0,   0, 0, 34},    /* Type 2 */

    /* 0.8-15us, 2300-4000 PRF, 25 pulses*/
    {25, 15, 2300, 4000,  0, 24, 10, 0, 18, 24, 0,   0, 0, 35},   /* Type 3 */

    /* 20-30us, 2000-4000 PRF, 20 pulses*/
    {20, 30, 2000, 4000, 0, 24, 8, 19, 33, 24, 0,   0, 0, 36},    /* Type 4 */
};


/* The following are for FCC Bin 1-4 pulses */
struct dfs_pulse ar9300_fcc_radars[] = {

    /* following two filters are specific to Japan/MKK4 */
//  {18,  1,  720,  720, 1,  6,  6,  0,  1, 18,  0, 3, 0, 17}, // 1389 +/- 6 us
//  {18,  4,  250,  250, 1, 10,  5,  1,  6, 18,  0, 3, 0, 18}, // 4000 +/- 6 us
//  {18,  5,  260,  260, 1, 10,  6,  1,  6, 18,  0, 3, 0, 19}, // 3846 +/- 7 us
    {18,  1,  720,  720, 0,  6,  6,  0,  1, 18,  0, 3, 0, 17}, // 1389 +/- 6 us
    {18,  4,  250,  250, 0, 10,  5,  1,  6, 18,  0, 3, 0, 18}, // 4000 +/- 6 us
    {18,  5,  260,  260, 0, 10,  6,  1,  6, 18,  0, 3, 1, 19}, // 3846 +/- 7 us
//  {18,  5,  260,  260, 1, 10,  6,  1,  6, 18,  0, 3, 1, 20}, // 3846 +/- 7 us

   {18, 5, 260, 260, 1, 10, 6, 1, 6, 18, 0, 3, 1, 20}, // 3846 +/- 7 us


    /* following filters are common to both FCC and JAPAN */

    // FCC TYPE 1
    // {18,  1,  325, 1930, 0,  6,  7,  0,  1, 18,  0, 3, 0, 0}, // 518 to 3066
    {18,  1,  700, 700, 0,  6,  5,  0,  1, 18,  0, 3, 1, 8}, 
    {18,  1,  350, 350, 0,  6,  5,  0,  1, 18,  0, 3, 0, 0}, 


    // FCC TYPE 6
    // {9,   1, 3003, 3003, 1,  7,  5,  0,  1, 18,  0, 0, 0, 1}, // 333 +/- 7 us
    //{9,   1, 3003, 3003, 1,  7,  5,  0,  1, 18,  0, 0, 0, 1},
    {9,   1, 3003, 3003, 0,  7,  5,  0,  1, 18,  0, 0, 1, 1},

    // FCC TYPE 2	
    {23, 5, 4347, 6666, 0, 18, 11,  0,  7, 22,  0, 3, 0, 2}, 

    // FCC TYPE 3
    {18, 10, 2000, 5000, 0, 23,  8,  6, 13, 22,  0, 3, 0, 5},

    // FCC TYPE 4
    {16, 15, 2000, 5000, 0, 25,  7, 11, 23, 22,  0, 3, 0, 11}, 

};

struct dfs_bin5pulse ar9300_bin5pulses[] = {
        {2, 28, 105, 12, 22, 5},
};


#if 0
/*
 * Find the internal HAL channel corresponding to the
 * public HAL channel specified in c
 */

static HAL_CHANNEL_INTERNAL *
getchannel(struct ath_hal *ah, const struct ieee80211_channel *c)
{
#define CHAN_FLAGS    (CHANNEL_ALL | CHANNEL_HALF | CHANNEL_QUARTER)
    HAL_CHANNEL_INTERNAL *base, *cc;
    int flags = c->channel_flags & CHAN_FLAGS;
    int n, lim;

    /*
     * Check current channel to avoid the lookup.
     */
    cc = AH_PRIVATE(ah)->ah_curchan;
    if (cc != AH_NULL && cc->channel == c->channel &&
        (cc->channel_flags & CHAN_FLAGS) == flags) {
        return cc;
    }

    /* binary search based on known sorting order */
    base = AH_TABLES(ah)->ah_channels;
    n = AH_PRIVATE(ah)->ah_nchan;
    /* binary search based on known sorting order */
    for (lim = n; lim != 0; lim >>= 1) {
        int d;
        cc = &base[lim >> 1];
        d = c->channel - cc->channel;
        if (d == 0) {
            if ((cc->channel_flags & CHAN_FLAGS) == flags) {
                return cc;
            }
            d = flags - (cc->channel_flags & CHAN_FLAGS);
        }
        HALDEBUG(ah, HAL_DEBUG_DFS, "%s: channel %u/0x%x d %d\n", __func__,
                cc->channel, cc->channel_flags, d);
        if (d > 0) {
            base = cc + 1;
            lim--;
        }
    }
    HALDEBUG(ah, HAL_DEBUG_DFS, "%s: no match for %u/0x%x\n",
            __func__, c->channel, c->channel_flags);
    return AH_NULL;
#undef CHAN_FLAGS
}

/*
 * Check the internal channel list to see if the desired channel
 * is ok to release from the NOL.  If not, then do nothing.  If so,
 * mark the channel as clear and reset the internal tsf time
 */
void
ar9300_check_dfs(struct ath_hal *ah, struct ieee80211_channel *chan)
{
    HAL_CHANNEL_INTERNAL *ichan = AH_NULL;

    ichan = getchannel(ah, chan);
    if (ichan == AH_NULL) {
        return;
    }
    if (!(ichan->priv_flags & CHANNEL_INTERFERENCE)) {
        return;
    }

    ichan->priv_flags &= ~CHANNEL_INTERFERENCE;
    ichan->dfs_tsf = 0;
}

/*
 * This function marks the channel as having found a dfs event
 * It also marks the end time that the dfs event should be cleared
 * If the channel is already marked, then tsf end time can only
 * be increased
 */
void
ar9300_dfs_found(struct ath_hal *ah, struct ieee80211_channel *chan, u_int64_t nol_time)
{
    HAL_CHANNEL_INTERNAL *ichan;

    ichan = getchannel(ah, chan);
    if (ichan == AH_NULL) {
        return;
    }
    if (!(ichan->priv_flags & CHANNEL_INTERFERENCE)) {
        ichan->dfs_tsf = ar9300_get_tsf64(ah);
    }
    ichan->dfs_tsf += nol_time;
    ichan->priv_flags |= CHANNEL_INTERFERENCE;
    chan->priv_flags |= CHANNEL_INTERFERENCE;
}
#endif

/*
 * Enable radar detection and set the radar parameters per the
 * values in pe
 */
void
ar9300_enable_dfs(struct ath_hal *ah, HAL_PHYERR_PARAM *pe)
{
    u_int32_t val;
    struct ath_hal_private  *ahp = AH_PRIVATE(ah);
    const struct ieee80211_channel *chan = ahp->ah_curchan;
    struct ath_hal_9300 *ah9300 = AH9300(ah);
    int reg_writes = 0;

    val = OS_REG_READ(ah, AR_PHY_RADAR_0);
    val |= AR_PHY_RADAR_0_FFT_ENA;


    if (pe->pe_enabled != HAL_PHYERR_PARAM_NOVAL) {
        val &= ~AR_PHY_RADAR_0_ENA;
        val |= SM(pe->pe_enabled, AR_PHY_RADAR_0_ENA);
    }

    if (pe->pe_firpwr != HAL_PHYERR_PARAM_NOVAL) {
        val &= ~AR_PHY_RADAR_0_FIRPWR;
        val |= SM(pe->pe_firpwr, AR_PHY_RADAR_0_FIRPWR);
    }
    if (pe->pe_rrssi != HAL_PHYERR_PARAM_NOVAL) {
        val &= ~AR_PHY_RADAR_0_RRSSI;
        val |= SM(pe->pe_rrssi, AR_PHY_RADAR_0_RRSSI);
    }
    if (pe->pe_height != HAL_PHYERR_PARAM_NOVAL) {
        val &= ~AR_PHY_RADAR_0_HEIGHT;
        val |= SM(pe->pe_height, AR_PHY_RADAR_0_HEIGHT);
    }
    if (pe->pe_prssi != HAL_PHYERR_PARAM_NOVAL) {
        val &= ~AR_PHY_RADAR_0_PRSSI;
        if (AR_SREV_AR9580(ah) || AR_SREV_WASP(ah) || AR_SREV_SCORPION(ah)) {
#if 0
            if (ah->ah_use_cac_prssi) {
                val |= SM(AR9300_DFS_PRSSI_CAC, AR_PHY_RADAR_0_PRSSI);
            } else {
#endif
                val |= SM(pe->pe_prssi, AR_PHY_RADAR_0_PRSSI);
//            }
        } else {
            val |= SM(pe->pe_prssi, AR_PHY_RADAR_0_PRSSI);
        }
    }
    if (pe->pe_inband != HAL_PHYERR_PARAM_NOVAL) {
        val &= ~AR_PHY_RADAR_0_INBAND;
        val |= SM(pe->pe_inband, AR_PHY_RADAR_0_INBAND);
    }
    OS_REG_WRITE(ah, AR_PHY_RADAR_0, val);

    val = OS_REG_READ(ah, AR_PHY_RADAR_1);
    val |= AR_PHY_RADAR_1_MAX_RRSSI | AR_PHY_RADAR_1_BLOCK_CHECK;
    if (pe->pe_maxlen != HAL_PHYERR_PARAM_NOVAL) {
        val &= ~AR_PHY_RADAR_1_MAXLEN;
        val |= SM(pe->pe_maxlen, AR_PHY_RADAR_1_MAXLEN);
    }
    if (pe->pe_relstep != HAL_PHYERR_PARAM_NOVAL) {
        val &= ~AR_PHY_RADAR_1_RELSTEP_THRESH;
        val |= SM(pe->pe_relstep, AR_PHY_RADAR_1_RELSTEP_THRESH);
    }
    if (pe->pe_relpwr != HAL_PHYERR_PARAM_NOVAL) {
        val &= ~AR_PHY_RADAR_1_RELPWR_THRESH;
        val |= SM(pe->pe_relpwr, AR_PHY_RADAR_1_RELPWR_THRESH);
    }
    OS_REG_WRITE(ah, AR_PHY_RADAR_1, val);

    if (ath_hal_getcapability(ah, HAL_CAP_EXT_CHAN_DFS, 0, 0) == HAL_OK) {
        val = OS_REG_READ(ah, AR_PHY_RADAR_EXT);
        if (IEEE80211_IS_CHAN_HT40(chan)) {
            /* Enable extension channel radar detection */
            OS_REG_WRITE(ah, AR_PHY_RADAR_EXT, val | AR_PHY_RADAR_EXT_ENA);
        } else {
            /* HT20 mode, disable extension channel radar detect */
            OS_REG_WRITE(ah, AR_PHY_RADAR_EXT, val & ~AR_PHY_RADAR_EXT_ENA);
        }
    }
    /*
        apply DFS postamble array from INI
        column 0 is register ID, column 1 is  HT20 value, colum2 is HT40 value
    */

    if (AR_SREV_AR9580(ah) || AR_SREV_WASP(ah) || AR_SREV_OSPREY_22(ah) || AR_SREV_SCORPION(ah)) {
        REG_WRITE_ARRAY(&ah9300->ah_ini_dfs, IEEE80211_IS_CHAN_HT40(chan)? 2:1, reg_writes);
    }
#ifdef ATH_HAL_DFS_CHIRPING_FIX_APH128
    ath_hal_printf(ah, "DFS change the timing value\n");
    if (AR_SREV_AR9580(ah) && IEEE80211_IS_CHAN_HT40(chan)) {
        OS_REG_WRITE(ah, AR_PHY_TIMING6, 0x3140c00a);
    }
#endif

}

/*
 * Get the radar parameter values and return them in the pe
 * structure
 */
void
ar9300_get_dfs_thresh(struct ath_hal *ah, HAL_PHYERR_PARAM *pe)
{
    u_int32_t val, temp;

    val = OS_REG_READ(ah, AR_PHY_RADAR_0);
    temp = MS(val, AR_PHY_RADAR_0_FIRPWR);
    temp |= ~(AR_PHY_RADAR_0_FIRPWR >> AR_PHY_RADAR_0_FIRPWR_S);
    pe->pe_firpwr = temp;
    pe->pe_rrssi = MS(val, AR_PHY_RADAR_0_RRSSI);
    pe->pe_height = MS(val, AR_PHY_RADAR_0_HEIGHT);
    pe->pe_prssi = MS(val, AR_PHY_RADAR_0_PRSSI);
    pe->pe_inband = MS(val, AR_PHY_RADAR_0_INBAND);
    pe->pe_enabled = !! MS(val, AR_PHY_RADAR_0_ENA);

    val = OS_REG_READ(ah, AR_PHY_RADAR_1);

    pe->pe_relpwr = MS(val, AR_PHY_RADAR_1_RELPWR_THRESH);
    pe->pe_enrelpwr = !! (val & AR_PHY_RADAR_1_RELPWR_ENA);

    pe->pe_relstep = MS(val, AR_PHY_RADAR_1_RELSTEP_THRESH);
    pe->pe_en_relstep_check = !! (val & AR_PHY_RADAR_1_RELSTEP_CHECK);

    pe->pe_maxlen = MS(val, AR_PHY_RADAR_1_MAXLEN);
}

#if 0
HAL_BOOL
ar9300_radar_wait(struct ath_hal *ah, struct ieee80211_channel *chan)
{
    struct ath_hal_private *ahp = AH_PRIVATE(ah);

    if (!ahp->ah_curchan) {
        return AH_TRUE;
    }

    /*
     * Rely on the upper layers to determine that we have spent
     * enough time waiting.
     */
    chan->channel = ahp->ah_curchan->channel;
    chan->channel_flags = ahp->ah_curchan->channel_flags;
    chan->max_reg_tx_power = ahp->ah_curchan->max_reg_tx_power;

    ahp->ah_curchan->priv_flags |= CHANNEL_DFS_CLEAR;
    chan->priv_flags  = ahp->ah_curchan->priv_flags;
    return AH_FALSE;

}
#endif

struct dfs_pulse *
ar9300_get_dfs_radars(
    struct ath_hal *ah,
    u_int32_t dfsdomain,
    int *numradars,
    struct dfs_bin5pulse **bin5pulses,
    int *numb5radars,
    HAL_PHYERR_PARAM *pe)
{
    struct dfs_pulse *dfs_radars = AH_NULL;
    switch (dfsdomain) {
    case HAL_DFS_FCC_DOMAIN:
        dfs_radars = &ar9300_fcc_radars[AR9300_FCC_RADARS_FCC_OFFSET];
        *numradars =
            ARRAY_LENGTH(ar9300_fcc_radars) - AR9300_FCC_RADARS_FCC_OFFSET;
        *bin5pulses = &ar9300_bin5pulses[0];
        *numb5radars = ARRAY_LENGTH(ar9300_bin5pulses);
        HALDEBUG(ah, HAL_DEBUG_DFS, "%s: DFS_FCC_DOMAIN_9300\n", __func__);
        break;
    case HAL_DFS_ETSI_DOMAIN:
        dfs_radars = &ar9300_etsi_radars[0];
        *numradars = ARRAY_LENGTH(ar9300_etsi_radars);
        *bin5pulses = &ar9300_bin5pulses[0];
        *numb5radars = ARRAY_LENGTH(ar9300_bin5pulses);
        HALDEBUG(ah, HAL_DEBUG_DFS, "%s: DFS_ETSI_DOMAIN_9300\n", __func__);
        break;
    case HAL_DFS_MKK4_DOMAIN:
        dfs_radars = &ar9300_fcc_radars[0];
        *numradars = ARRAY_LENGTH(ar9300_fcc_radars);
        *bin5pulses = &ar9300_bin5pulses[0];
        *numb5radars = ARRAY_LENGTH(ar9300_bin5pulses);
        HALDEBUG(ah, HAL_DEBUG_DFS, "%s: DFS_MKK4_DOMAIN_9300\n", __func__);
        break;
    default:
        HALDEBUG(ah, HAL_DEBUG_DFS, "%s: no domain\n", __func__);
        return AH_NULL;
    }
    /* Set the default phy parameters per chip */
    pe->pe_firpwr = AR9300_DFS_FIRPWR;
    pe->pe_rrssi = AR9300_DFS_RRSSI;
    pe->pe_height = AR9300_DFS_HEIGHT;
    pe->pe_prssi = AR9300_DFS_PRSSI;
    /*
        we have an issue with PRSSI.
        For normal operation we use AR9300_DFS_PRSSI, which is set to 6.
        Please refer to EV91563, 94164.
        However, this causes problem during CAC as no radar is detected
        during that period with PRSSI=6. Only PRSSI= 10 seems to fix this.
        We use this flag to keep track of change in PRSSI.
    */

//    ah->ah_use_cac_prssi = 0;

    pe->pe_inband = AR9300_DFS_INBAND;
    pe->pe_relpwr = AR9300_DFS_RELPWR;
    pe->pe_relstep = AR9300_DFS_RELSTEP;
    pe->pe_maxlen = AR9300_DFS_MAXLEN;
    return dfs_radars;
}

HAL_BOOL
ar9300_get_default_dfs_thresh(struct ath_hal *ah, HAL_PHYERR_PARAM *pe)
{

    pe->pe_firpwr = AR9300_DFS_FIRPWR;
    pe->pe_rrssi = AR9300_DFS_RRSSI;
    pe->pe_height = AR9300_DFS_HEIGHT;
    pe->pe_prssi = AR9300_DFS_PRSSI;
    /* see prssi comment above */

    pe->pe_inband = AR9300_DFS_INBAND;
    pe->pe_relpwr = AR9300_DFS_RELPWR;
    pe->pe_relstep = AR9300_DFS_RELSTEP;
    pe->pe_maxlen = AR9300_DFS_MAXLEN;
    return (AH_TRUE);
}

void ar9300_adjust_difs(struct ath_hal *ah, u_int32_t val)
{
    if (val == 0) {
        /*
         * EV 116936:
         * Restore the register values with that of the HAL structure.
         * Do not assume and overwrite these values to whatever 
         * is in ar9300_osprey22.ini.
         */
        struct ath_hal_9300 *ahp = AH9300(ah);
        HAL_TX_QUEUE_INFO *qi;
        int q;

        AH9300(ah)->ah_fccaifs = 0;
        HALDEBUG(ah, HAL_DEBUG_DFS, "%s: restore DIFS \n", __func__);
        for (q = 0; q < 4; q++) {
            qi = &ahp->ah_txq[q];
            OS_REG_WRITE(ah, AR_DLCL_IFS(q),
                    SM(qi->tqi_cwmin, AR_D_LCL_IFS_CWMIN)
                    | SM(qi->tqi_cwmax, AR_D_LCL_IFS_CWMAX)
                    | SM(qi->tqi_aifs, AR_D_LCL_IFS_AIFS));
        }
    } else {
        /*
         * These are values from George Lai and are specific to
         * FCC domain. They are yet to be determined for other domains. 
         */

        AH9300(ah)->ah_fccaifs = 1;
        HALDEBUG(ah, HAL_DEBUG_DFS, "%s: set DIFS to default\n", __func__);
        /*printk("%s:  modify DIFS\n", __func__);*/
        
        OS_REG_WRITE(ah, AR_DLCL_IFS(0), 0x05fffc0f);
        OS_REG_WRITE(ah, AR_DLCL_IFS(1), 0x05f0fc0f);
        OS_REG_WRITE(ah, AR_DLCL_IFS(2), 0x05f03c07);
        OS_REG_WRITE(ah, AR_DLCL_IFS(3), 0x05f01c03);
    }
}

u_int32_t ar9300_dfs_config_fft(struct ath_hal *ah, HAL_BOOL is_enable)
{
    u_int32_t val;

    val = OS_REG_READ(ah, AR_PHY_RADAR_0);

    if (is_enable) {
        val |= AR_PHY_RADAR_0_FFT_ENA;
    } else {
        val &= ~AR_PHY_RADAR_0_FFT_ENA;
    }

    OS_REG_WRITE(ah, AR_PHY_RADAR_0, val);
    val = OS_REG_READ(ah, AR_PHY_RADAR_0);
    return val;
}
/*
    function to adjust PRSSI value for CAC problem

*/
void
ar9300_dfs_cac_war(struct ath_hal *ah, u_int32_t start)
{
    u_int32_t val;

    if (AR_SREV_AR9580(ah) || AR_SREV_WASP(ah) || AR_SREV_SCORPION(ah)) {
        val = OS_REG_READ(ah, AR_PHY_RADAR_0);
        if (start) {
            val &= ~AR_PHY_RADAR_0_PRSSI;
            val |= SM(AR9300_DFS_PRSSI_CAC, AR_PHY_RADAR_0_PRSSI); 
        } else {
            val &= ~AR_PHY_RADAR_0_PRSSI;
            val |= SM(AR9300_DFS_PRSSI, AR_PHY_RADAR_0_PRSSI);
        }
        OS_REG_WRITE(ah, AR_PHY_RADAR_0, val | AR_PHY_RADAR_0_ENA);
//        ah->ah_use_cac_prssi = start;
    }
}

#if 0
struct ieee80211_channel *
ar9300_get_extension_channel(struct ath_hal *ah)
{
    struct ath_hal_private  *ahp = AH_PRIVATE(ah);
    struct ath_hal_private_tables  *aht = AH_TABLES(ah);
    int i = 0;

    HAL_CHANNEL_INTERNAL *ichan = AH_NULL;
    CHAN_CENTERS centers;

    ichan = ahp->ah_curchan;
    ar9300_get_channel_centers(ah, ichan, &centers);
    if (centers.ctl_center == centers.ext_center) {
        return AH_NULL;
    }
    for (i = 0; i < ahp->ah_nchan; i++) {
        ichan = &aht->ah_channels[i];
        if (ichan->channel == centers.ext_center) {
            return (struct ieee80211_channel*)ichan;
        }
    }
    return AH_NULL;
}
#endif

HAL_BOOL
ar9300_is_fast_clock_enabled(struct ath_hal *ah)
{
    struct ath_hal_private *ahp = AH_PRIVATE(ah);

    if (IS_5GHZ_FAST_CLOCK_EN(ah, ahp->ah_curchan)) {
        return AH_TRUE;
    }
    return AH_FALSE;
}

/*
 * This should be enabled and linked into the build once
 * radar support is enabled.
 */
#if 0
HAL_BOOL
ar9300_handle_radar_bb_panic(struct ath_hal *ah)
{
    u_int32_t status;
    u_int32_t val;   
#ifdef AH_DEBUG
    struct ath_hal_9300 *ahp = AH9300(ah);
#endif
       
    status = AH_PRIVATE(ah)->ah_bb_panic_last_status;
   
    if ( status == 0x04000539 ) { 
        /* recover from this BB panic without reset*/
        /* set AR9300_DFS_FIRPWR to -1 */
        val = OS_REG_READ(ah, AR_PHY_RADAR_0);
        val &= (~AR_PHY_RADAR_0_FIRPWR);
        val |= SM( 0x7f, AR_PHY_RADAR_0_FIRPWR);
        OS_REG_WRITE(ah, AR_PHY_RADAR_0, val);
        OS_DELAY(1);
        /* set AR9300_DFS_FIRPWR to its default value */
        val = OS_REG_READ(ah, AR_PHY_RADAR_0);
        val &= ~AR_PHY_RADAR_0_FIRPWR;
        val |= SM( AR9300_DFS_FIRPWR, AR_PHY_RADAR_0_FIRPWR);
        OS_REG_WRITE(ah, AR_PHY_RADAR_0, val);
        return AH_TRUE;
    } else if (status == 0x0400000a) {
        /* EV 92527 : reset required if we see this signature */
        HALDEBUG(ah, HAL_DEBUG_DFS, "%s: BB Panic -- 0x0400000a\n", __func__);
        return AH_FALSE;
    } else if (status == 0x1300000a) {
        /* EV92527: we do not need a reset if we see this signature */
        HALDEBUG(ah, HAL_DEBUG_DFS, "%s: BB Panic -- 0x1300000a\n", __func__);
        return AH_TRUE;
    } else if ((AR_SREV_WASP(ah) || AR_SREV_HONEYBEE(ah)) && (status == 0x04000409)) {
        return AH_TRUE;
    } else {
        if (ar9300_get_capability(ah, HAL_CAP_LDPCWAR, 0, AH_NULL) == HAL_OK &&
            (status & 0xff00000f) == 0x04000009 &&
            status != 0x04000409 &&
            status != 0x04000b09 &&
            status != 0x04000e09 &&
            (status & 0x0000ff00))
        {
            /* disable RIFS Rx */
#ifdef AH_DEBUG
            HALDEBUG(ah, HAL_DEBUG_UNMASKABLE, "%s: BB status=0x%08x rifs=%d - disable\n",
                     __func__, status, ahp->ah_rifs_enabled);
            ar9300_set_rifs_delay(ah, AH_FALSE);
        }
        return AH_FALSE;
    }
}
#endif
#endif