/*
 * 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/kernel.h>
#include <wlc_cfg.h>
#include <linuxver.h>
#include <bcmdefs.h>
#include <osl.h>
#include <bcmutils.h>
#include <siutils.h>
#include <bcmendian.h>
#include <proto/802.11.h>
#include <wlioctl.h>
#include <bcmwifi.h>
#include <d11.h>
#include <wlc_rate.h>
#include <wlc_pub.h>
#include <wlc_key.h>
#include <wlc_channel.h>
#include <wlc_bsscfg.h>
#include <wlc_mac80211.h>
#include <wlc_scb.h>
#include <wl_export.h>
#include <wlc_bmac.h>
#include <wlc_stf.h>

#define WLC_STF_SS_STBC_RX(wlc) (WLCISNPHY(wlc->band) && \
	NREV_GT(wlc->band->phyrev, 3) && NREV_LE(wlc->band->phyrev, 6))

static s8 wlc_stf_stbc_rx_get(wlc_info_t *wlc);
static bool wlc_stf_stbc_tx_set(wlc_info_t *wlc, s32 int_val);
static int wlc_stf_txcore_set(wlc_info_t *wlc, u8 Nsts, u8 val);
static int wlc_stf_spatial_policy_set(wlc_info_t *wlc, int val);
static void wlc_stf_stbc_rx_ht_update(wlc_info_t *wlc, int val);

static void _wlc_stf_phy_txant_upd(wlc_info_t *wlc);
static u16 _wlc_stf_phytxchain_sel(wlc_info_t *wlc, ratespec_t rspec);

#define NSTS_1	1
#define NSTS_2	2
#define NSTS_3	3
#define NSTS_4	4
const u8 txcore_default[5] = {
	(0),			/* bitmap of the core enabled */
	(0x01),			/* For Nsts = 1, enable core 1 */
	(0x03),			/* For Nsts = 2, enable core 1 & 2 */
	(0x07),			/* For Nsts = 3, enable core 1, 2 & 3 */
	(0x0f)			/* For Nsts = 4, enable all cores */
};

static void wlc_stf_stbc_rx_ht_update(wlc_info_t *wlc, int val)
{
	ASSERT((val == HT_CAP_RX_STBC_NO)
	       || (val == HT_CAP_RX_STBC_ONE_STREAM));

	/* MIMOPHYs rev3-6 cannot receive STBC with only one rx core active */
	if (WLC_STF_SS_STBC_RX(wlc)) {
		if ((wlc->stf->rxstreams == 1) && (val != HT_CAP_RX_STBC_NO))
			return;
	}

	wlc->ht_cap.cap &= ~HT_CAP_RX_STBC_MASK;
	wlc->ht_cap.cap |= (val << HT_CAP_RX_STBC_SHIFT);

	if (wlc->pub->up) {
		wlc_update_beacon(wlc);
		wlc_update_probe_resp(wlc, true);
	}
}

/* every WLC_TEMPSENSE_PERIOD seconds temperature check to decide whether to turn on/off txchain */
void wlc_tempsense_upd(wlc_info_t *wlc)
{
	wlc_phy_t *pi = wlc->band->pi;
	uint active_chains, txchain;

	/* Check if the chip is too hot. Disable one Tx chain, if it is */
	/* high 4 bits are for Rx chain, low 4 bits are  for Tx chain */
	active_chains = wlc_phy_stf_chain_active_get(pi);
	txchain = active_chains & 0xf;

	if (wlc->stf->txchain == wlc->stf->hw_txchain) {
		if (txchain && (txchain < wlc->stf->hw_txchain)) {
			/* turn off 1 tx chain */
			wlc_stf_txchain_set(wlc, txchain, true);
		}
	} else if (wlc->stf->txchain < wlc->stf->hw_txchain) {
		if (txchain == wlc->stf->hw_txchain) {
			/* turn back on txchain */
			wlc_stf_txchain_set(wlc, txchain, true);
		}
	}
}

void
wlc_stf_ss_algo_channel_get(wlc_info_t *wlc, u16 *ss_algo_channel,
			    chanspec_t chanspec)
{
	tx_power_t power;
	u8 siso_mcs_id, cdd_mcs_id, stbc_mcs_id;

	/* Clear previous settings */
	*ss_algo_channel = 0;

	if (!wlc->pub->up) {
		*ss_algo_channel = (u16) -1;
		return;
	}

	wlc_phy_txpower_get_current(wlc->band->pi, &power,
				    CHSPEC_CHANNEL(chanspec));

	siso_mcs_id = (CHSPEC_IS40(chanspec)) ?
	    WL_TX_POWER_MCS40_SISO_FIRST : WL_TX_POWER_MCS20_SISO_FIRST;
	cdd_mcs_id = (CHSPEC_IS40(chanspec)) ?
	    WL_TX_POWER_MCS40_CDD_FIRST : WL_TX_POWER_MCS20_CDD_FIRST;
	stbc_mcs_id = (CHSPEC_IS40(chanspec)) ?
	    WL_TX_POWER_MCS40_STBC_FIRST : WL_TX_POWER_MCS20_STBC_FIRST;

	/* criteria to choose stf mode */

	/* the "+3dbm (12 0.25db units)" is to account for the fact that with CDD, tx occurs
	 * on both chains
	 */
	if (power.target[siso_mcs_id] > (power.target[cdd_mcs_id] + 12))
		setbit(ss_algo_channel, PHY_TXC1_MODE_SISO);
	else
		setbit(ss_algo_channel, PHY_TXC1_MODE_CDD);

	/* STBC is ORed into to algo channel as STBC requires per-packet SCB capability check
	 * so cannot be default mode of operation. One of SISO, CDD have to be set
	 */
	if (power.target[siso_mcs_id] <= (power.target[stbc_mcs_id] + 12))
		setbit(ss_algo_channel, PHY_TXC1_MODE_STBC);
}

static s8 wlc_stf_stbc_rx_get(wlc_info_t *wlc)
{
	return (wlc->ht_cap.cap & HT_CAP_RX_STBC_MASK) >> HT_CAP_RX_STBC_SHIFT;
}

static bool wlc_stf_stbc_tx_set(wlc_info_t *wlc, s32 int_val)
{
	if ((int_val != AUTO) && (int_val != OFF) && (int_val != ON)) {
		return false;
	}

	if ((int_val == ON) && (wlc->stf->txstreams == 1))
		return false;

	if ((int_val == OFF) || (wlc->stf->txstreams == 1)
	    || !WLC_STBC_CAP_PHY(wlc))
		wlc->ht_cap.cap &= ~HT_CAP_TX_STBC;
	else
		wlc->ht_cap.cap |= HT_CAP_TX_STBC;

	wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = (s8) int_val;
	wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = (s8) int_val;

	return true;
}

bool wlc_stf_stbc_rx_set(wlc_info_t *wlc, s32 int_val)
{
	if ((int_val != HT_CAP_RX_STBC_NO)
	    && (int_val != HT_CAP_RX_STBC_ONE_STREAM)) {
		return false;
	}

	if (WLC_STF_SS_STBC_RX(wlc)) {
		if ((int_val != HT_CAP_RX_STBC_NO)
		    && (wlc->stf->rxstreams == 1))
			return false;
	}

	wlc_stf_stbc_rx_ht_update(wlc, int_val);
	return true;
}

static int wlc_stf_txcore_set(wlc_info_t *wlc, u8 Nsts, u8 core_mask)
{
	WL_TRACE(("wl%d: %s: Nsts %d core_mask %x\n",
		  wlc->pub->unit, __func__, Nsts, core_mask));

	ASSERT((Nsts > 0) && (Nsts <= MAX_STREAMS_SUPPORTED));

	if (WLC_BITSCNT(core_mask) > wlc->stf->txstreams) {
		core_mask = 0;
	}

	if ((WLC_BITSCNT(core_mask) == wlc->stf->txstreams) &&
	    ((core_mask & ~wlc->stf->txchain)
	     || !(core_mask & wlc->stf->txchain))) {
		core_mask = wlc->stf->txchain;
	}

	ASSERT(!core_mask || Nsts <= WLC_BITSCNT(core_mask));

	wlc->stf->txcore[Nsts] = core_mask;
	/* Nsts = 1..4, txcore index = 1..4 */
	if (Nsts == 1) {
		/* Needs to update beacon and ucode generated response
		 * frames when 1 stream core map changed
		 */
		wlc->stf->phytxant = core_mask << PHY_TXC_ANT_SHIFT;
		wlc_bmac_txant_set(wlc->hw, wlc->stf->phytxant);
		if (wlc->clk) {
			wlc_suspend_mac_and_wait(wlc);
			wlc_beacon_phytxctl_txant_upd(wlc, wlc->bcn_rspec);
			wlc_enable_mac(wlc);
		}
	}

	return BCME_OK;
}

static int wlc_stf_spatial_policy_set(wlc_info_t *wlc, int val)
{
	int i;
	u8 core_mask = 0;

	WL_TRACE(("wl%d: %s: val %x\n", wlc->pub->unit, __func__, val));

	wlc->stf->spatial_policy = (s8) val;
	for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++) {
		core_mask = (val == MAX_SPATIAL_EXPANSION) ?
		    wlc->stf->txchain : txcore_default[i];
		wlc_stf_txcore_set(wlc, (u8) i, core_mask);
	}
	return BCME_OK;
}

int wlc_stf_txchain_set(wlc_info_t *wlc, s32 int_val, bool force)
{
	u8 txchain = (u8) int_val;
	u8 txstreams;
	uint i;

	if (wlc->stf->txchain == txchain)
		return BCME_OK;

	if ((txchain & ~wlc->stf->hw_txchain)
	    || !(txchain & wlc->stf->hw_txchain))
		return BCME_RANGE;

	/* if nrate override is configured to be non-SISO STF mode, reject reducing txchain to 1 */
	txstreams = (u8) WLC_BITSCNT(txchain);
	if (txstreams > MAX_STREAMS_SUPPORTED)
		return BCME_RANGE;

	if (txstreams == 1) {
		for (i = 0; i < NBANDS(wlc); i++)
			if ((RSPEC_STF(wlc->bandstate[i]->rspec_override) !=
			     PHY_TXC1_MODE_SISO)
			    || (RSPEC_STF(wlc->bandstate[i]->mrspec_override) !=
				PHY_TXC1_MODE_SISO)) {
				if (!force)
					return BCME_ERROR;

				/* over-write the override rspec */
				if (RSPEC_STF(wlc->bandstate[i]->rspec_override)
				    != PHY_TXC1_MODE_SISO) {
					wlc->bandstate[i]->rspec_override = 0;
					WL_ERROR(("%s(): temp sense override non-SISO" " rspec_override.\n", __func__));
				}
				if (RSPEC_STF
				    (wlc->bandstate[i]->mrspec_override) !=
				    PHY_TXC1_MODE_SISO) {
					wlc->bandstate[i]->mrspec_override = 0;
					WL_ERROR(("%s(): temp sense override non-SISO" " mrspec_override.\n", __func__));
				}
			}
	}

	wlc->stf->txchain = txchain;
	wlc->stf->txstreams = txstreams;
	wlc_stf_stbc_tx_set(wlc, wlc->band->band_stf_stbc_tx);
	wlc_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
	wlc_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
	wlc->stf->txant =
	    (wlc->stf->txstreams == 1) ? ANT_TX_FORCE_0 : ANT_TX_DEF;
	_wlc_stf_phy_txant_upd(wlc);

	wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain,
			      wlc->stf->rxchain);

	for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++)
		wlc_stf_txcore_set(wlc, (u8) i, txcore_default[i]);

	return BCME_OK;
}

int wlc_stf_rxchain_set(wlc_info_t *wlc, s32 int_val)
{
	u8 rxchain_cnt;
	u8 rxchain = (u8) int_val;
	u8 mimops_mode;
	u8 old_rxchain, old_rxchain_cnt;

	if (wlc->stf->rxchain == rxchain)
		return BCME_OK;

	if ((rxchain & ~wlc->stf->hw_rxchain)
	    || !(rxchain & wlc->stf->hw_rxchain))
		return BCME_RANGE;

	rxchain_cnt = (u8) WLC_BITSCNT(rxchain);
	if (WLC_STF_SS_STBC_RX(wlc)) {
		if ((rxchain_cnt == 1)
		    && (wlc_stf_stbc_rx_get(wlc) != HT_CAP_RX_STBC_NO))
			return BCME_RANGE;
	}

	if (APSTA_ENAB(wlc->pub) && (wlc->pub->associated))
		return BCME_ASSOCIATED;

	old_rxchain = wlc->stf->rxchain;
	old_rxchain_cnt = wlc->stf->rxstreams;

	wlc->stf->rxchain = rxchain;
	wlc->stf->rxstreams = rxchain_cnt;

	if (rxchain_cnt != old_rxchain_cnt) {
		mimops_mode =
		    (rxchain_cnt == 1) ? HT_CAP_MIMO_PS_ON : HT_CAP_MIMO_PS_OFF;
		wlc->mimops_PM = mimops_mode;
		if (AP_ENAB(wlc->pub)) {
			wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain,
					      wlc->stf->rxchain);
			wlc_ht_mimops_cap_update(wlc, mimops_mode);
			if (wlc->pub->associated)
				wlc_mimops_action_ht_send(wlc, wlc->cfg,
							  mimops_mode);
			return BCME_OK;
		}
		if (wlc->pub->associated) {
			if (mimops_mode == HT_CAP_MIMO_PS_OFF) {
				/* if mimops is off, turn on the Rx chain first */
				wlc_phy_stf_chain_set(wlc->band->pi,
						      wlc->stf->txchain,
						      wlc->stf->rxchain);
				wlc_ht_mimops_cap_update(wlc, mimops_mode);
			}
		} else {
			wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain,
					      wlc->stf->rxchain);
			wlc_ht_mimops_cap_update(wlc, mimops_mode);
		}
	} else if (old_rxchain != rxchain)
		wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain,
				      wlc->stf->rxchain);

	return BCME_OK;
}

/* update wlc->stf->ss_opmode which represents the operational stf_ss mode we're using */
int wlc_stf_ss_update(wlc_info_t *wlc, wlcband_t *band)
{
	int ret_code = 0;
	u8 prev_stf_ss;
	u8 upd_stf_ss;

	prev_stf_ss = wlc->stf->ss_opmode;

	/* NOTE: opmode can only be SISO or CDD as STBC is decided on a per-packet basis */
	if (WLC_STBC_CAP_PHY(wlc) &&
	    wlc->stf->ss_algosel_auto
	    && (wlc->stf->ss_algo_channel != (u16) -1)) {
		ASSERT(isset(&wlc->stf->ss_algo_channel, PHY_TXC1_MODE_CDD)
		       || isset(&wlc->stf->ss_algo_channel,
				PHY_TXC1_MODE_SISO));
		upd_stf_ss = (wlc->stf->no_cddstbc || (wlc->stf->txstreams == 1)
			      || isset(&wlc->stf->ss_algo_channel,
				       PHY_TXC1_MODE_SISO)) ? PHY_TXC1_MODE_SISO
		    : PHY_TXC1_MODE_CDD;
	} else {
		if (wlc->band != band)
			return ret_code;
		upd_stf_ss = (wlc->stf->no_cddstbc
			      || (wlc->stf->txstreams ==
				  1)) ? PHY_TXC1_MODE_SISO : band->
		    band_stf_ss_mode;
	}
	if (prev_stf_ss != upd_stf_ss) {
		wlc->stf->ss_opmode = upd_stf_ss;
		wlc_bmac_band_stf_ss_set(wlc->hw, upd_stf_ss);
	}

	return ret_code;
}

int wlc_stf_attach(wlc_info_t *wlc)
{
	wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_SISO;
	wlc->bandstate[BAND_5G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_CDD;

	if (WLCISNPHY(wlc->band) &&
	    (wlc_phy_txpower_hw_ctrl_get(wlc->band->pi) != PHY_TPC_HW_ON))
		wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode =
		    PHY_TXC1_MODE_CDD;
	wlc_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
	wlc_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);

	wlc_stf_stbc_rx_ht_update(wlc, HT_CAP_RX_STBC_NO);
	wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = OFF;
	wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = OFF;

	if (WLC_STBC_CAP_PHY(wlc)) {
		wlc->stf->ss_algosel_auto = true;
		wlc->stf->ss_algo_channel = (u16) -1;	/* Init the default value */
	}
	return 0;
}

void wlc_stf_detach(wlc_info_t *wlc)
{
}

int wlc_stf_ant_txant_validate(wlc_info_t *wlc, s8 val)
{
	int bcmerror = BCME_OK;

	/* when there is only 1 tx_streams, don't allow to change the txant */
	if (WLCISNPHY(wlc->band) && (wlc->stf->txstreams == 1))
		return ((val == wlc->stf->txant) ? bcmerror : BCME_RANGE);

	switch (val) {
	case -1:
		val = ANT_TX_DEF;
		break;
	case 0:
		val = ANT_TX_FORCE_0;
		break;
	case 1:
		val = ANT_TX_FORCE_1;
		break;
	case 3:
		val = ANT_TX_LAST_RX;
		break;
	default:
		bcmerror = BCME_RANGE;
		break;
	}

	if (bcmerror == BCME_OK)
		wlc->stf->txant = (s8) val;

	return bcmerror;

}

/*
 * Centralized txant update function. call it whenever wlc->stf->txant and/or wlc->stf->txchain
 *  change
 *
 * Antennas are controlled by ucode indirectly, which drives PHY or GPIO to
 *   achieve various tx/rx antenna selection schemes
 *
 * legacy phy, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7 means auto(last rx)
 * for NREV<3, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7 means last rx and
 *    do tx-antenna selection for SISO transmissions
 * for NREV=3, bit 6 and bit _8_ means antenna 0 and 1 respectively, bit6+bit7 means last rx and
 *    do tx-antenna selection for SISO transmissions
 * for NREV>=7, bit 6 and bit 7 mean antenna 0 and 1 respectively, nit6+bit7 means both cores active
*/
static void _wlc_stf_phy_txant_upd(wlc_info_t *wlc)
{
	s8 txant;

	txant = (s8) wlc->stf->txant;
	ASSERT(txant == ANT_TX_FORCE_0 || txant == ANT_TX_FORCE_1
	       || txant == ANT_TX_LAST_RX);

	if (WLC_PHY_11N_CAP(wlc->band)) {
		if (txant == ANT_TX_FORCE_0) {
			wlc->stf->phytxant = PHY_TXC_ANT_0;
		} else if (txant == ANT_TX_FORCE_1) {
			wlc->stf->phytxant = PHY_TXC_ANT_1;

			if (WLCISNPHY(wlc->band) &&
			    NREV_GE(wlc->band->phyrev, 3)
			    && NREV_LT(wlc->band->phyrev, 7)) {
				wlc->stf->phytxant = PHY_TXC_ANT_2;
			}
		} else {
			if (WLCISLCNPHY(wlc->band) || WLCISSSLPNPHY(wlc->band))
				wlc->stf->phytxant = PHY_TXC_LCNPHY_ANT_LAST;
			else {
				/* keep this assert to catch out of sync wlc->stf->txcore */
				ASSERT(wlc->stf->txchain > 0);
				wlc->stf->phytxant =
				    wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
			}
		}
	} else {
		if (txant == ANT_TX_FORCE_0)
			wlc->stf->phytxant = PHY_TXC_OLD_ANT_0;
		else if (txant == ANT_TX_FORCE_1)
			wlc->stf->phytxant = PHY_TXC_OLD_ANT_1;
		else
			wlc->stf->phytxant = PHY_TXC_OLD_ANT_LAST;
	}

	wlc_bmac_txant_set(wlc->hw, wlc->stf->phytxant);
}

void wlc_stf_phy_txant_upd(wlc_info_t *wlc)
{
	_wlc_stf_phy_txant_upd(wlc);
}

void wlc_stf_phy_chain_calc(wlc_info_t *wlc)
{
	/* get available rx/tx chains */
	wlc->stf->hw_txchain = (u8) getintvar(wlc->pub->vars, "txchain");
	wlc->stf->hw_rxchain = (u8) getintvar(wlc->pub->vars, "rxchain");

	/* these parameter are intended to be used for all PHY types */
	if (wlc->stf->hw_txchain == 0 || wlc->stf->hw_txchain == 0xf) {
		if (WLCISNPHY(wlc->band)) {
			wlc->stf->hw_txchain = TXCHAIN_DEF_NPHY;
		} else {
			wlc->stf->hw_txchain = TXCHAIN_DEF;
		}
	}

	wlc->stf->txchain = wlc->stf->hw_txchain;
	wlc->stf->txstreams = (u8) WLC_BITSCNT(wlc->stf->hw_txchain);

	if (wlc->stf->hw_rxchain == 0 || wlc->stf->hw_rxchain == 0xf) {
		if (WLCISNPHY(wlc->band)) {
			wlc->stf->hw_rxchain = RXCHAIN_DEF_NPHY;
		} else {
			wlc->stf->hw_rxchain = RXCHAIN_DEF;
		}
	}

	wlc->stf->rxchain = wlc->stf->hw_rxchain;
	wlc->stf->rxstreams = (u8) WLC_BITSCNT(wlc->stf->hw_rxchain);

	/* initialize the txcore table */
	bcopy(txcore_default, wlc->stf->txcore, sizeof(wlc->stf->txcore));

	/* default spatial_policy */
	wlc->stf->spatial_policy = MIN_SPATIAL_EXPANSION;
	wlc_stf_spatial_policy_set(wlc, MIN_SPATIAL_EXPANSION);
}

static u16 _wlc_stf_phytxchain_sel(wlc_info_t *wlc, ratespec_t rspec)
{
	u16 phytxant = wlc->stf->phytxant;

	if (RSPEC_STF(rspec) != PHY_TXC1_MODE_SISO) {
		ASSERT(wlc->stf->txstreams > 1);
		phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
	} else if (wlc->stf->txant == ANT_TX_DEF)
		phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
	phytxant &= PHY_TXC_ANT_MASK;
	return phytxant;
}

u16 wlc_stf_phytxchain_sel(wlc_info_t *wlc, ratespec_t rspec)
{
	return _wlc_stf_phytxchain_sel(wlc, rspec);
}

u16 wlc_stf_d11hdrs_phyctl_txant(wlc_info_t *wlc, ratespec_t rspec)
{
	u16 phytxant = wlc->stf->phytxant;
	u16 mask = PHY_TXC_ANT_MASK;

	/* for non-siso rates or default setting, use the available chains */
	if (WLCISNPHY(wlc->band)) {
		ASSERT(wlc->stf->txchain != 0);
		phytxant = _wlc_stf_phytxchain_sel(wlc, rspec);
		mask = PHY_TXC_HTANT_MASK;
	}
	phytxant |= phytxant & mask;
	return phytxant;
}