channel.c

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/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * 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 <linux/types.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include <net/regulatory.h>

#include <defs.h>
#include "pub.h"
#include "phy/phy_hal.h"
#include "main.h"
#include "stf.h"
#include "channel.h"
#include "mac80211_if.h"

/* QDB() macro takes a dB value and converts to a quarter dB value */
#define QDB(n) ((n) * BRCMS_TXPWR_DB_FACTOR)

#define LOCALE_MIMO_IDX_bn      0
#define LOCALE_MIMO_IDX_11n     0

/* max of BAND_5G_PWR_LVLS and 14 for 2.4 GHz */
#define BRCMS_MAXPWR_MIMO_TBL_SIZE  14

/* maxpwr mapping to 5GHz band channels:
 * maxpwr[0] - channels [34-48]
 * maxpwr[1] - channels [52-60]
 * maxpwr[2] - channels [62-64]
 * maxpwr[3] - channels [100-140]
 * maxpwr[4] - channels [149-165]
 */
#define BAND_5G_PWR_LVLS    5   /* 5 power levels for 5G */

#define LC(id)  LOCALE_MIMO_IDX_ ## id

#define LOCALES(mimo2, mimo5) \
        {LC(mimo2), LC(mimo5)}

/* macro to get 5 GHz channel group index for tx power */
#define CHANNEL_POWER_IDX_5G(c) (((c) < 52) ? 0 : \
                 (((c) < 62) ? 1 : \
                 (((c) < 100) ? 2 : \
                 (((c) < 149) ? 3 : 4))))

#define BRCM_2GHZ_2412_2462 REG_RULE(2412-10, 2462+10, 40, 0, 19, 0)
#define BRCM_2GHZ_2467_2472 REG_RULE(2467-10, 2472+10, 20, 0, 19, \
                     NL80211_RRF_PASSIVE_SCAN | \
                     NL80211_RRF_NO_IBSS)

#define BRCM_5GHZ_5180_5240 REG_RULE(5180-10, 5240+10, 40, 0, 21, \
                     NL80211_RRF_PASSIVE_SCAN | \
                     NL80211_RRF_NO_IBSS)
#define BRCM_5GHZ_5260_5320 REG_RULE(5260-10, 5320+10, 40, 0, 21, \
                     NL80211_RRF_PASSIVE_SCAN | \
                     NL80211_RRF_DFS | \
                     NL80211_RRF_NO_IBSS)
#define BRCM_5GHZ_5500_5700 REG_RULE(5500-10, 5700+10, 40, 0, 21, \
                     NL80211_RRF_PASSIVE_SCAN | \
                     NL80211_RRF_DFS | \
                     NL80211_RRF_NO_IBSS)
#define BRCM_5GHZ_5745_5825 REG_RULE(5745-10, 5825+10, 40, 0, 21, \
                     NL80211_RRF_PASSIVE_SCAN | \
                     NL80211_RRF_NO_IBSS)

static const struct ieee80211_regdomain brcms_regdom_x2 = {
    .n_reg_rules = 6,
    .alpha2 = "X2",
    .reg_rules = {
        BRCM_2GHZ_2412_2462,
        BRCM_2GHZ_2467_2472,
        BRCM_5GHZ_5180_5240,
        BRCM_5GHZ_5260_5320,
        BRCM_5GHZ_5500_5700,
        BRCM_5GHZ_5745_5825,
    }
};

 /* locale per-channel tx power limits for MIMO frames
  * maxpwr arrays are index by channel for 2.4 GHz limits, and
  * by sub-band for 5 GHz limits using CHANNEL_POWER_IDX_5G(channel)
  */
struct locale_mimo_info {
    /* tx 20 MHz power limits, qdBm units */
    s8 maxpwr20[BRCMS_MAXPWR_MIMO_TBL_SIZE];
    /* tx 40 MHz power limits, qdBm units */
    s8 maxpwr40[BRCMS_MAXPWR_MIMO_TBL_SIZE];
};

/* Country names and abbreviations with locale defined from ISO 3166 */
struct country_info {
    const u8 locale_mimo_2G;    /* 2.4G mimo info */
    const u8 locale_mimo_5G;    /* 5G mimo info */
};

struct brcms_regd {
    struct country_info country;
    const struct ieee80211_regdomain *regdomain;
};

struct brcms_cm_info {
    struct brcms_pub *pub;
    struct brcms_c_info *wlc;
    const struct brcms_regd *world_regd;
};

/*
 * MIMO Locale Definitions - 2.4 GHz
 */
static const struct locale_mimo_info locale_bn = {
    {QDB(13), QDB(13), QDB(13), QDB(13), QDB(13),
     QDB(13), QDB(13), QDB(13), QDB(13), QDB(13),
     QDB(13), QDB(13), QDB(13)},
    {0, 0, QDB(13), QDB(13), QDB(13),
     QDB(13), QDB(13), QDB(13), QDB(13), QDB(13),
     QDB(13), 0, 0},
};

static const struct locale_mimo_info *g_mimo_2g_table[] = {
    &locale_bn
};

/*
 * MIMO Locale Definitions - 5 GHz
 */
static const struct locale_mimo_info locale_11n = {
    { /* 12.5 dBm */ 50, 50, 50, QDB(15), QDB(15)},
    {QDB(14), QDB(15), QDB(15), QDB(15), QDB(15)},
};

static const struct locale_mimo_info *g_mimo_5g_table[] = {
    &locale_11n
};

static const struct brcms_regd cntry_locales[] = {
    /* Worldwide RoW 2, must always be at index 0 */
    {
        .country = LOCALES(bn, 11n),
        .regdomain = &brcms_regdom_x2,
    },
};

static const struct locale_mimo_info *brcms_c_get_mimo_2g(u8 locale_idx)
{
    if (locale_idx >= ARRAY_SIZE(g_mimo_2g_table))
        return NULL;

    return g_mimo_2g_table[locale_idx];
}

static const struct locale_mimo_info *brcms_c_get_mimo_5g(u8 locale_idx)
{
    if (locale_idx >= ARRAY_SIZE(g_mimo_5g_table))
        return NULL;

    return g_mimo_5g_table[locale_idx];
}

/*
 * Indicates whether the country provided is valid to pass
 * to cfg80211 or not.
 *
 * returns true if valid; false if not.
 */
static bool brcms_c_country_valid(const char *ccode)
{
    /*
     * only allow ascii alpha uppercase for the first 2
     * chars.
     */
    if (!((0x80 & ccode[0]) == 0 && ccode[0] >= 0x41 && ccode[0] <= 0x5A &&
          (0x80 & ccode[1]) == 0 && ccode[1] >= 0x41 && ccode[1] <= 0x5A &&
          ccode[2] == '\0'))
        return false;

    /*
     * do not match ISO 3166-1 user assigned country codes
     * that may be in the driver table
     */
    if (!strcmp("AA", ccode) ||        /* AA */
        !strcmp("ZZ", ccode) ||        /* ZZ */
        ccode[0] == 'X' ||             /* XA - XZ */
        (ccode[0] == 'Q' &&            /* QM - QZ */
         (ccode[1] >= 'M' && ccode[1] <= 'Z')))
        return false;

    if (!strcmp("NA", ccode))
        return false;

    return true;
}

static const struct brcms_regd *brcms_world_regd(const char *regdom, int len)
{
    const struct brcms_regd *regd = NULL;
    int i;

    for (i = 0; i < ARRAY_SIZE(cntry_locales); i++) {
        if (!strncmp(regdom, cntry_locales[i].regdomain->alpha2, len)) {
            regd = &cntry_locales[i];
            break;
        }
    }

    return regd;
}

static const struct brcms_regd *brcms_default_world_regd(void)
{
    return &cntry_locales[0];
}

/* JP, J1 - J10 are Japan ccodes */
static bool brcms_c_japan_ccode(const char *ccode)
{
    return (ccode[0] == 'J' &&
        (ccode[1] == 'P' || (ccode[1] >= '1' && ccode[1] <= '9')));
}

static void
brcms_c_channel_min_txpower_limits_with_local_constraint(
        struct brcms_cm_info *wlc_cm, struct txpwr_limits *txpwr,
        u8 local_constraint_qdbm)
{
    int j;

    /* CCK Rates */
    for (j = 0; j < WL_TX_POWER_CCK_NUM; j++)
        txpwr->cck[j] = min(txpwr->cck[j], local_constraint_qdbm);

    /* 20 MHz Legacy OFDM SISO */
    for (j = 0; j < WL_TX_POWER_OFDM_NUM; j++)
        txpwr->ofdm[j] = min(txpwr->ofdm[j], local_constraint_qdbm);

    /* 20 MHz Legacy OFDM CDD */
    for (j = 0; j < BRCMS_NUM_RATES_OFDM; j++)
        txpwr->ofdm_cdd[j] =
            min(txpwr->ofdm_cdd[j], local_constraint_qdbm);

    /* 40 MHz Legacy OFDM SISO */
    for (j = 0; j < BRCMS_NUM_RATES_OFDM; j++)
        txpwr->ofdm_40_siso[j] =
            min(txpwr->ofdm_40_siso[j], local_constraint_qdbm);

    /* 40 MHz Legacy OFDM CDD */
    for (j = 0; j < BRCMS_NUM_RATES_OFDM; j++)
        txpwr->ofdm_40_cdd[j] =
            min(txpwr->ofdm_40_cdd[j], local_constraint_qdbm);

    /* 20MHz MCS 0-7 SISO */
    for (j = 0; j < BRCMS_NUM_RATES_MCS_1_STREAM; j++)
        txpwr->mcs_20_siso[j] =
            min(txpwr->mcs_20_siso[j], local_constraint_qdbm);

    /* 20MHz MCS 0-7 CDD */
    for (j = 0; j < BRCMS_NUM_RATES_MCS_1_STREAM; j++)
        txpwr->mcs_20_cdd[j] =
            min(txpwr->mcs_20_cdd[j], local_constraint_qdbm);

    /* 20MHz MCS 0-7 STBC */
    for (j = 0; j < BRCMS_NUM_RATES_MCS_1_STREAM; j++)
        txpwr->mcs_20_stbc[j] =
            min(txpwr->mcs_20_stbc[j], local_constraint_qdbm);

    /* 20MHz MCS 8-15 MIMO */
    for (j = 0; j < BRCMS_NUM_RATES_MCS_2_STREAM; j++)
        txpwr->mcs_20_mimo[j] =
            min(txpwr->mcs_20_mimo[j], local_constraint_qdbm);

    /* 40MHz MCS 0-7 SISO */
    for (j = 0; j < BRCMS_NUM_RATES_MCS_1_STREAM; j++)
        txpwr->mcs_40_siso[j] =
            min(txpwr->mcs_40_siso[j], local_constraint_qdbm);

    /* 40MHz MCS 0-7 CDD */
    for (j = 0; j < BRCMS_NUM_RATES_MCS_1_STREAM; j++)
        txpwr->mcs_40_cdd[j] =
            min(txpwr->mcs_40_cdd[j], local_constraint_qdbm);

    /* 40MHz MCS 0-7 STBC */
    for (j = 0; j < BRCMS_NUM_RATES_MCS_1_STREAM; j++)
        txpwr->mcs_40_stbc[j] =
            min(txpwr->mcs_40_stbc[j], local_constraint_qdbm);

    /* 40MHz MCS 8-15 MIMO */
    for (j = 0; j < BRCMS_NUM_RATES_MCS_2_STREAM; j++)
        txpwr->mcs_40_mimo[j] =
            min(txpwr->mcs_40_mimo[j], local_constraint_qdbm);

    /* 40MHz MCS 32 */
    txpwr->mcs32 = min(txpwr->mcs32, local_constraint_qdbm);

}

/*
 * set the driver's current country and regulatory information
 * using a country code as the source. Look up built in country
 * information found with the country code.
 */
static void
brcms_c_set_country(struct brcms_cm_info *wlc_cm,
            const struct brcms_regd *regd)
{
    struct brcms_c_info *wlc = wlc_cm->wlc;

    if ((wlc->pub->_n_enab & SUPPORT_11N) !=
        wlc->protection->nmode_user)
        brcms_c_set_nmode(wlc);

    brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
    brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);

    brcms_c_set_gmode(wlc, wlc->protection->gmode_user, false);

    return;
}

struct brcms_cm_info *brcms_c_channel_mgr_attach(struct brcms_c_info *wlc)
{
    struct brcms_cm_info *wlc_cm;
    struct brcms_pub *pub = wlc->pub;
    struct ssb_sprom *sprom = &wlc->hw->d11core->bus->sprom;
    const char *ccode = sprom->alpha2;
    int ccode_len = sizeof(sprom->alpha2);

    BCMMSG(wlc->wiphy, "wl%d\n", wlc->pub->unit);

    wlc_cm = kzalloc(sizeof(struct brcms_cm_info), GFP_ATOMIC);
    if (wlc_cm == NULL)
        return NULL;
    wlc_cm->pub = pub;
    wlc_cm->wlc = wlc;
    wlc->cmi = wlc_cm;

    /* store the country code for passing up as a regulatory hint */
    wlc_cm->world_regd = brcms_world_regd(ccode, ccode_len);
    if (brcms_c_country_valid(ccode))
        strncpy(wlc->pub->srom_ccode, ccode, ccode_len);

    /*
     * If no custom world domain is found in the SROM, use the
     * default "X2" domain.
     */
    if (!wlc_cm->world_regd) {
        wlc_cm->world_regd = brcms_default_world_regd();
        ccode = wlc_cm->world_regd->regdomain->alpha2;
        ccode_len = BRCM_CNTRY_BUF_SZ - 1;
    }

    /* save default country for exiting 11d regulatory mode */
    strncpy(wlc->country_default, ccode, ccode_len);

    /* initialize autocountry_default to driver default */
    strncpy(wlc->autocountry_default, ccode, ccode_len);

    brcms_c_set_country(wlc_cm, wlc_cm->world_regd);

    return wlc_cm;
}

void brcms_c_channel_mgr_detach(struct brcms_cm_info *wlc_cm)
{
    kfree(wlc_cm);
}

void
brcms_c_channel_set_chanspec(struct brcms_cm_info *wlc_cm, u16 chanspec,
             u8 local_constraint_qdbm)
{
    struct brcms_c_info *wlc = wlc_cm->wlc;
    struct ieee80211_channel *ch = wlc->pub->ieee_hw->conf.channel;
    struct txpwr_limits txpwr;

    brcms_c_channel_reg_limits(wlc_cm, chanspec, &txpwr);

    brcms_c_channel_min_txpower_limits_with_local_constraint(
        wlc_cm, &txpwr, local_constraint_qdbm
    );

    /* set or restore gmode as required by regulatory */
    if (ch->flags & IEEE80211_CHAN_NO_OFDM)
        brcms_c_set_gmode(wlc, GMODE_LEGACY_B, false);
    else
        brcms_c_set_gmode(wlc, wlc->protection->gmode_user, false);

    brcms_b_set_chanspec(wlc->hw, chanspec,
                  !!(ch->flags & IEEE80211_CHAN_PASSIVE_SCAN),
                  &txpwr);
}

void
brcms_c_channel_reg_limits(struct brcms_cm_info *wlc_cm, u16 chanspec,
               struct txpwr_limits *txpwr)
{
    struct brcms_c_info *wlc = wlc_cm->wlc;
    struct ieee80211_channel *ch = wlc->pub->ieee_hw->conf.channel;
    uint i;
    uint chan;
    int maxpwr;
    int delta;
    const struct country_info *country;
    struct brcms_band *band;
    int conducted_max = BRCMS_TXPWR_MAX;
    const struct locale_mimo_info *li_mimo;
    int maxpwr20, maxpwr40;
    int maxpwr_idx;
    uint j;

    memset(txpwr, 0, sizeof(struct txpwr_limits));

    if (WARN_ON(!ch))
        return;

    country = &wlc_cm->world_regd->country;

    chan = CHSPEC_CHANNEL(chanspec);
    band = wlc->bandstate[chspec_bandunit(chanspec)];
    li_mimo = (band->bandtype == BRCM_BAND_5G) ?
        brcms_c_get_mimo_5g(country->locale_mimo_5G) :
        brcms_c_get_mimo_2g(country->locale_mimo_2G);

    delta = band->antgain;

    if (band->bandtype == BRCM_BAND_2G)
        conducted_max = QDB(22);

    maxpwr = QDB(ch->max_power) - delta;
    maxpwr = max(maxpwr, 0);
    maxpwr = min(maxpwr, conducted_max);

    /* CCK txpwr limits for 2.4G band */
    if (band->bandtype == BRCM_BAND_2G) {
        for (i = 0; i < BRCMS_NUM_RATES_CCK; i++)
            txpwr->cck[i] = (u8) maxpwr;
    }

    for (i = 0; i < BRCMS_NUM_RATES_OFDM; i++) {
        txpwr->ofdm[i] = (u8) maxpwr;

        /*
         * OFDM 40 MHz SISO has the same power as the corresponding
         * MCS0-7 rate unless overriden by the locale specific code.
         * We set this value to 0 as a flag (presumably 0 dBm isn't
         * a possibility) and then copy the MCS0-7 value to the 40 MHz
         * value if it wasn't explicitly set.
         */
        txpwr->ofdm_40_siso[i] = 0;

        txpwr->ofdm_cdd[i] = (u8) maxpwr;

        txpwr->ofdm_40_cdd[i] = 0;
    }

    delta = 0;
    if (band->antgain > QDB(6))
        delta = band->antgain - QDB(6); /* Excess over 6 dB */

    if (band->bandtype == BRCM_BAND_2G)
        maxpwr_idx = (chan - 1);
    else
        maxpwr_idx = CHANNEL_POWER_IDX_5G(chan);

    maxpwr20 = li_mimo->maxpwr20[maxpwr_idx];
    maxpwr40 = li_mimo->maxpwr40[maxpwr_idx];

    maxpwr20 = maxpwr20 - delta;
    maxpwr20 = max(maxpwr20, 0);
    maxpwr40 = maxpwr40 - delta;
    maxpwr40 = max(maxpwr40, 0);

    /* Fill in the MCS 0-7 (SISO) rates */
    for (i = 0; i < BRCMS_NUM_RATES_MCS_1_STREAM; i++) {

        /*
         * 20 MHz has the same power as the corresponding OFDM rate
         * unless overriden by the locale specific code.
         */
        txpwr->mcs_20_siso[i] = txpwr->ofdm[i];
        txpwr->mcs_40_siso[i] = 0;
    }

    /* Fill in the MCS 0-7 CDD rates */
    for (i = 0; i < BRCMS_NUM_RATES_MCS_1_STREAM; i++) {
        txpwr->mcs_20_cdd[i] = (u8) maxpwr20;
        txpwr->mcs_40_cdd[i] = (u8) maxpwr40;
    }

    /*
     * These locales have SISO expressed in the
     * table and override CDD later
     */
    if (li_mimo == &locale_bn) {
        if (li_mimo == &locale_bn) {
            maxpwr20 = QDB(16);
            maxpwr40 = 0;

            if (chan >= 3 && chan <= 11)
                maxpwr40 = QDB(16);
        }

        for (i = 0; i < BRCMS_NUM_RATES_MCS_1_STREAM; i++) {
            txpwr->mcs_20_siso[i] = (u8) maxpwr20;
            txpwr->mcs_40_siso[i] = (u8) maxpwr40;
        }
    }

    /* Fill in the MCS 0-7 STBC rates */
    for (i = 0; i < BRCMS_NUM_RATES_MCS_1_STREAM; i++) {
        txpwr->mcs_20_stbc[i] = 0;
        txpwr->mcs_40_stbc[i] = 0;
    }

    /* Fill in the MCS 8-15 SDM rates */
    for (i = 0; i < BRCMS_NUM_RATES_MCS_2_STREAM; i++) {
        txpwr->mcs_20_mimo[i] = (u8) maxpwr20;
        txpwr->mcs_40_mimo[i] = (u8) maxpwr40;
    }

    /* Fill in MCS32 */
    txpwr->mcs32 = (u8) maxpwr40;

    for (i = 0, j = 0; i < BRCMS_NUM_RATES_OFDM; i++, j++) {
        if (txpwr->ofdm_40_cdd[i] == 0)
            txpwr->ofdm_40_cdd[i] = txpwr->mcs_40_cdd[j];
        if (i == 0) {
            i = i + 1;
            if (txpwr->ofdm_40_cdd[i] == 0)
                txpwr->ofdm_40_cdd[i] = txpwr->mcs_40_cdd[j];
        }
    }

    /*
     * Copy the 40 MHZ MCS 0-7 CDD value to the 40 MHZ MCS 0-7 SISO
     * value if it wasn't provided explicitly.
     */
    for (i = 0; i < BRCMS_NUM_RATES_MCS_1_STREAM; i++) {
        if (txpwr->mcs_40_siso[i] == 0)
            txpwr->mcs_40_siso[i] = txpwr->mcs_40_cdd[i];
    }

    for (i = 0, j = 0; i < BRCMS_NUM_RATES_OFDM; i++, j++) {
        if (txpwr->ofdm_40_siso[i] == 0)
            txpwr->ofdm_40_siso[i] = txpwr->mcs_40_siso[j];
        if (i == 0) {
            i = i + 1;
            if (txpwr->ofdm_40_siso[i] == 0)
                txpwr->ofdm_40_siso[i] = txpwr->mcs_40_siso[j];
        }
    }

    /*
     * Copy the 20 and 40 MHz MCS0-7 CDD values to the corresponding
     * STBC values if they weren't provided explicitly.
     */
    for (i = 0; i < BRCMS_NUM_RATES_MCS_1_STREAM; i++) {
        if (txpwr->mcs_20_stbc[i] == 0)
            txpwr->mcs_20_stbc[i] = txpwr->mcs_20_cdd[i];

        if (txpwr->mcs_40_stbc[i] == 0)
            txpwr->mcs_40_stbc[i] = txpwr->mcs_40_cdd[i];
    }

    return;
}

/*
 * Verify the chanspec is using a legal set of parameters, i.e. that the
 * chanspec specified a band, bw, ctl_sb and channel and that the
 * combination could be legal given any set of circumstances.
 * RETURNS: true is the chanspec is malformed, false if it looks good.
 */
static bool brcms_c_chspec_malformed(u16 chanspec)
{
    /* must be 2G or 5G band */
    if (!CHSPEC_IS5G(chanspec) && !CHSPEC_IS2G(chanspec))
        return true;
    /* must be 20 or 40 bandwidth */
    if (!CHSPEC_IS40(chanspec) && !CHSPEC_IS20(chanspec))
        return true;

    /* 20MHZ b/w must have no ctl sb, 40 must have a ctl sb */
    if (CHSPEC_IS20(chanspec)) {
        if (!CHSPEC_SB_NONE(chanspec))
            return true;
    } else if (!CHSPEC_SB_UPPER(chanspec) && !CHSPEC_SB_LOWER(chanspec)) {
        return true;
    }

    return false;
}

/*
 * Validate the chanspec for this locale, for 40MHZ we need to also
 * check that the sidebands are valid 20MZH channels in this locale
 * and they are also a legal HT combination
 */
static bool
brcms_c_valid_chanspec_ext(struct brcms_cm_info *wlc_cm, u16 chspec)
{
    struct brcms_c_info *wlc = wlc_cm->wlc;
    u8 channel = CHSPEC_CHANNEL(chspec);

    /* check the chanspec */
    if (brcms_c_chspec_malformed(chspec)) {
        wiphy_err(wlc->wiphy, "wl%d: malformed chanspec 0x%x\n",
            wlc->pub->unit, chspec);
        return false;
    }

    if (CHANNEL_BANDUNIT(wlc_cm->wlc, channel) !=
        chspec_bandunit(chspec))
        return false;

    return true;
}

bool brcms_c_valid_chanspec_db(struct brcms_cm_info *wlc_cm, u16 chspec)
{
    return brcms_c_valid_chanspec_ext(wlc_cm, chspec);
}

static bool brcms_is_radar_freq(u16 center_freq)
{
    return center_freq >= 5260 && center_freq <= 5700;
}

static void brcms_reg_apply_radar_flags(struct wiphy *wiphy)
{
    struct ieee80211_supported_band *sband;
    struct ieee80211_channel *ch;
    int i;

    sband = wiphy->bands[IEEE80211_BAND_5GHZ];
    if (!sband)
        return;

    for (i = 0; i < sband->n_channels; i++) {
        ch = &sband->channels[i];

        if (!brcms_is_radar_freq(ch->center_freq))
            continue;

        /*
         * All channels in this range should be passive and have
         * DFS enabled.
         */
        if (!(ch->flags & IEEE80211_CHAN_DISABLED))
            ch->flags |= IEEE80211_CHAN_RADAR |
                     IEEE80211_CHAN_NO_IBSS |
                     IEEE80211_CHAN_PASSIVE_SCAN;
    }
}

static void
brcms_reg_apply_beaconing_flags(struct wiphy *wiphy,
                enum nl80211_reg_initiator initiator)
{
    struct ieee80211_supported_band *sband;
    struct ieee80211_channel *ch;
    const struct ieee80211_reg_rule *rule;
    int band, i, ret;

    for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
        sband = wiphy->bands[band];
        if (!sband)
            continue;

        for (i = 0; i < sband->n_channels; i++) {
            ch = &sband->channels[i];

            if (ch->flags &
                (IEEE80211_CHAN_DISABLED | IEEE80211_CHAN_RADAR))
                continue;

            if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
                ret = freq_reg_info(wiphy, ch->center_freq,
                            0, &rule);
                if (ret)
                    continue;

                if (!(rule->flags & NL80211_RRF_NO_IBSS))
                    ch->flags &= ~IEEE80211_CHAN_NO_IBSS;
                if (!(rule->flags & NL80211_RRF_PASSIVE_SCAN))
                    ch->flags &=
                        ~IEEE80211_CHAN_PASSIVE_SCAN;
            } else if (ch->beacon_found) {
                ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
                           IEEE80211_CHAN_PASSIVE_SCAN);
            }
        }
    }
}

static int brcms_reg_notifier(struct wiphy *wiphy,
                  struct regulatory_request *request)
{
    struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
    struct brcms_info *wl = hw->priv;
    struct brcms_c_info *wlc = wl->wlc;
    struct ieee80211_supported_band *sband;
    struct ieee80211_channel *ch;
    int band, i;
    bool ch_found = false;

    brcms_reg_apply_radar_flags(wiphy);

    if (request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
        brcms_reg_apply_beaconing_flags(wiphy, request->initiator);

    /* Disable radio if all channels disallowed by regulatory */
    for (band = 0; !ch_found && band < IEEE80211_NUM_BANDS; band++) {
        sband = wiphy->bands[band];
        if (!sband)
            continue;

        for (i = 0; !ch_found && i < sband->n_channels; i++) {
            ch = &sband->channels[i];

            if (!(ch->flags & IEEE80211_CHAN_DISABLED))
                ch_found = true;
        }
    }

    if (ch_found) {
        mboolclr(wlc->pub->radio_disabled, WL_RADIO_COUNTRY_DISABLE);
    } else {
        mboolset(wlc->pub->radio_disabled, WL_RADIO_COUNTRY_DISABLE);
        wiphy_err(wlc->wiphy, "wl%d: %s: no valid channel for \"%s\"\n",
              wlc->pub->unit, __func__, request->alpha2);
    }

    if (wlc->pub->_nbands > 1 || wlc->band->bandtype == BRCM_BAND_2G)
        wlc_phy_chanspec_ch14_widefilter_set(wlc->band->pi,
                    brcms_c_japan_ccode(request->alpha2));

    return 0;
}

void brcms_c_regd_init(struct brcms_c_info *wlc)
{
    struct wiphy *wiphy = wlc->wiphy;
    const struct brcms_regd *regd = wlc->cmi->world_regd;
    struct ieee80211_supported_band *sband;
    struct ieee80211_channel *ch;
    struct brcms_chanvec sup_chan;
    struct brcms_band *band;
    int band_idx, i;

    /* Disable any channels not supported by the phy */
    for (band_idx = 0; band_idx < wlc->pub->_nbands; band_idx++) {
        band = wlc->bandstate[band_idx];

        wlc_phy_chanspec_band_validch(band->pi, band->bandtype,
                          &sup_chan);

        if (band_idx == BAND_2G_INDEX)
            sband = wiphy->bands[IEEE80211_BAND_2GHZ];
        else
            sband = wiphy->bands[IEEE80211_BAND_5GHZ];

        for (i = 0; i < sband->n_channels; i++) {
            ch = &sband->channels[i];
            if (!isset(sup_chan.vec, ch->hw_value))
                ch->flags |= IEEE80211_CHAN_DISABLED;
        }
    }

    wlc->wiphy->reg_notifier = brcms_reg_notifier;
    wlc->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY |
                 WIPHY_FLAG_STRICT_REGULATORY;
    wiphy_apply_custom_regulatory(wlc->wiphy, regd->regdomain);
    brcms_reg_apply_beaconing_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER);
}