drivers/staging/brcm80211/brcmsmac/wlc_stf.c

   1 /*
   2  * Copyright (c) 2010 Broadcom Corporation
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <wlc_cfg.h>
  20 #include <bcmdefs.h>
  21 #include <osl.h>
  22 #include <bcmutils.h>
  23 #include <siutils.h>
  24 #include <bcmendian.h>
  25 #include <proto/802.11.h>
  26 #include <wlioctl.h>
  27 #include <bcmwifi.h>
  28 #include <sbhndpio.h>
  29 #include <sbhnddma.h>
  30 #include <d11.h>
  31 #include <wlc_rate.h>
  32 #include <wlc_pub.h>
  33 #include <wlc_key.h>
  34 #include <wlc_channel.h>
  35 #include <wlc_bsscfg.h>
  36 #include <wlc_event.h>
  37 #include <wlc_mac80211.h>
  38 #include <wlc_scb.h>
  39 #include <wl_export.h>
  40 #include <wlc_bmac.h>
  41 #include <wlc_stf.h>
  42 #include <wl_dbg.h>
  43
  44 #define WLC_STF_SS_STBC_RX(wlc) (WLCISNPHY(wlc->band) && \
  45         NREV_GT(wlc->band->phyrev, 3) && NREV_LE(wlc->band->phyrev, 6))
  46
  47 static bool wlc_stf_stbc_tx_set(struct wlc_info *wlc, s32 int_val);
  48 static int wlc_stf_txcore_set(struct wlc_info *wlc, u8 Nsts, u8 val);
  49 static int wlc_stf_spatial_policy_set(struct wlc_info *wlc, int val);
  50 static void wlc_stf_stbc_rx_ht_update(struct wlc_info *wlc, int val);
  51
  52 static void _wlc_stf_phy_txant_upd(struct wlc_info *wlc);
  53 static u16 _wlc_stf_phytxchain_sel(struct wlc_info *wlc, ratespec_t rspec);
  54
  55 #define NSTS_1  1
  56 #define NSTS_2  2
  57 #define NSTS_3  3
  58 #define NSTS_4  4
  59 const u8 txcore_default[5] = {
  60         (0),                    /* bitmap of the core enabled */
  61         (0x01),                 /* For Nsts = 1, enable core 1 */
  62         (0x03),                 /* For Nsts = 2, enable core 1 & 2 */
  63         (0x07),                 /* For Nsts = 3, enable core 1, 2 & 3 */
  64         (0x0f)                  /* For Nsts = 4, enable all cores */
  65 };
  66
  67 static void wlc_stf_stbc_rx_ht_update(struct wlc_info *wlc, int val)
  68 {
  69         ASSERT((val == HT_CAP_RX_STBC_NO)
  70                || (val == HT_CAP_RX_STBC_ONE_STREAM));
  71
  72         /* MIMOPHYs rev3-6 cannot receive STBC with only one rx core active */
  73         if (WLC_STF_SS_STBC_RX(wlc)) {
  74                 if ((wlc->stf->rxstreams == 1) && (val != HT_CAP_RX_STBC_NO))
  75                         return;
  76         }
  77
  78         wlc->ht_cap.cap_info &= ~HT_CAP_RX_STBC_MASK;
  79         wlc->ht_cap.cap_info |= (val << HT_CAP_RX_STBC_SHIFT);
  80
  81         if (wlc->pub->up) {
  82                 wlc_update_beacon(wlc);
  83                 wlc_update_probe_resp(wlc, true);
  84         }
  85 }
  86
  87 /* every WLC_TEMPSENSE_PERIOD seconds temperature check to decide whether to turn on/off txchain */
  88 void wlc_tempsense_upd(struct wlc_info *wlc)
  89 {
  90         wlc_phy_t *pi = wlc->band->pi;
  91         uint active_chains, txchain;
  92
  93         /* Check if the chip is too hot. Disable one Tx chain, if it is */
  94         /* high 4 bits are for Rx chain, low 4 bits are  for Tx chain */
  95         active_chains = wlc_phy_stf_chain_active_get(pi);
  96         txchain = active_chains & 0xf;
  97
  98         if (wlc->stf->txchain == wlc->stf->hw_txchain) {
  99                 if (txchain && (txchain < wlc->stf->hw_txchain)) {
 100                         /* turn off 1 tx chain */
 101                         wlc_stf_txchain_set(wlc, txchain, true);
 102                 }
 103         } else if (wlc->stf->txchain < wlc->stf->hw_txchain) {
 104                 if (txchain == wlc->stf->hw_txchain) {
 105                         /* turn back on txchain */
 106                         wlc_stf_txchain_set(wlc, txchain, true);
 107                 }
 108         }
 109 }
 110
 111 void
 112 wlc_stf_ss_algo_channel_get(struct wlc_info *wlc, u16 *ss_algo_channel,
 113                             chanspec_t chanspec)
 114 {
 115         tx_power_t power;
 116         u8 siso_mcs_id, cdd_mcs_id, stbc_mcs_id;
 117
 118         /* Clear previous settings */
 119         *ss_algo_channel = 0;
 120
 121         if (!wlc->pub->up) {
 122                 *ss_algo_channel = (u16) -1;
 123                 return;
 124         }
 125
 126         wlc_phy_txpower_get_current(wlc->band->pi, &power,
 127                                     CHSPEC_CHANNEL(chanspec));
 128
 129         siso_mcs_id = (CHSPEC_IS40(chanspec)) ?
 130             WL_TX_POWER_MCS40_SISO_FIRST : WL_TX_POWER_MCS20_SISO_FIRST;
 131         cdd_mcs_id = (CHSPEC_IS40(chanspec)) ?
 132             WL_TX_POWER_MCS40_CDD_FIRST : WL_TX_POWER_MCS20_CDD_FIRST;
 133         stbc_mcs_id = (CHSPEC_IS40(chanspec)) ?
 134             WL_TX_POWER_MCS40_STBC_FIRST : WL_TX_POWER_MCS20_STBC_FIRST;
 135
 136         /* criteria to choose stf mode */
 137
 138         /* the "+3dbm (12 0.25db units)" is to account for the fact that with CDD, tx occurs
 139          * on both chains
 140          */
 141         if (power.target[siso_mcs_id] > (power.target[cdd_mcs_id] + 12))
 142                 setbit(ss_algo_channel, PHY_TXC1_MODE_SISO);
 143         else
 144                 setbit(ss_algo_channel, PHY_TXC1_MODE_CDD);
 145
 146         /* STBC is ORed into to algo channel as STBC requires per-packet SCB capability check
 147          * so cannot be default mode of operation. One of SISO, CDD have to be set
 148          */
 149         if (power.target[siso_mcs_id] <= (power.target[stbc_mcs_id] + 12))
 150                 setbit(ss_algo_channel, PHY_TXC1_MODE_STBC);
 151 }
 152
 153 static bool wlc_stf_stbc_tx_set(struct wlc_info *wlc, s32 int_val)
 154 {
 155         if ((int_val != AUTO) && (int_val != OFF) && (int_val != ON)) {
 156                 return false;
 157         }
 158
 159         if ((int_val == ON) && (wlc->stf->txstreams == 1))
 160                 return false;
 161
 162         if ((int_val == OFF) || (wlc->stf->txstreams == 1)
 163             || !WLC_STBC_CAP_PHY(wlc))
 164                 wlc->ht_cap.cap_info &= ~IEEE80211_HT_CAP_TX_STBC;
 165         else
 166                 wlc->ht_cap.cap_info |= IEEE80211_HT_CAP_TX_STBC;
 167
 168         wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 169         wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 170
 171         return true;
 172 }
 173
 174 bool wlc_stf_stbc_rx_set(struct wlc_info *wlc, s32 int_val)
 175 {
 176         if ((int_val != HT_CAP_RX_STBC_NO)
 177             && (int_val != HT_CAP_RX_STBC_ONE_STREAM)) {
 178                 return false;
 179         }
 180
 181         if (WLC_STF_SS_STBC_RX(wlc)) {
 182                 if ((int_val != HT_CAP_RX_STBC_NO)
 183                     && (wlc->stf->rxstreams == 1))
 184                         return false;
 185         }
 186
 187         wlc_stf_stbc_rx_ht_update(wlc, int_val);
 188         return true;
 189 }
 190
 191 static int wlc_stf_txcore_set(struct wlc_info *wlc, u8 Nsts, u8 core_mask)
 192 {
 193         WL_TRACE("wl%d: %s: Nsts %d core_mask %x\n",
 194                  wlc->pub->unit, __func__, Nsts, core_mask);
 195
 196         ASSERT((Nsts > 0) && (Nsts <= MAX_STREAMS_SUPPORTED));
 197
 198         if (WLC_BITSCNT(core_mask) > wlc->stf->txstreams) {
 199                 core_mask = 0;
 200         }
 201
 202         if ((WLC_BITSCNT(core_mask) == wlc->stf->txstreams) &&
 203             ((core_mask & ~wlc->stf->txchain)
 204              || !(core_mask & wlc->stf->txchain))) {
 205                 core_mask = wlc->stf->txchain;
 206         }
 207
 208         ASSERT(!core_mask || Nsts <= WLC_BITSCNT(core_mask));
 209
 210         wlc->stf->txcore[Nsts] = core_mask;
 211         /* Nsts = 1..4, txcore index = 1..4 */
 212         if (Nsts == 1) {
 213                 /* Needs to update beacon and ucode generated response
 214                  * frames when 1 stream core map changed
 215                  */
 216                 wlc->stf->phytxant = core_mask << PHY_TXC_ANT_SHIFT;
 217                 wlc_bmac_txant_set(wlc->hw, wlc->stf->phytxant);
 218                 if (wlc->clk) {
 219                         wlc_suspend_mac_and_wait(wlc);
 220                         wlc_beacon_phytxctl_txant_upd(wlc, wlc->bcn_rspec);
 221                         wlc_enable_mac(wlc);
 222                 }
 223         }
 224
 225         return BCME_OK;
 226 }
 227
 228 static int wlc_stf_spatial_policy_set(struct wlc_info *wlc, int val)
 229 {
 230         int i;
 231         u8 core_mask = 0;
 232
 233         WL_TRACE("wl%d: %s: val %x\n", wlc->pub->unit, __func__, val);
 234
 235         wlc->stf->spatial_policy = (s8) val;
 236         for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++) {
 237                 core_mask = (val == MAX_SPATIAL_EXPANSION) ?
 238                     wlc->stf->txchain : txcore_default[i];
 239                 wlc_stf_txcore_set(wlc, (u8) i, core_mask);
 240         }
 241         return BCME_OK;
 242 }
 243
 244 int wlc_stf_txchain_set(struct wlc_info *wlc, s32 int_val, bool force)
 245 {
 246         u8 txchain = (u8) int_val;
 247         u8 txstreams;
 248         uint i;
 249
 250         if (wlc->stf->txchain == txchain)
 251                 return BCME_OK;
 252
 253         if ((txchain & ~wlc->stf->hw_txchain)
 254             || !(txchain & wlc->stf->hw_txchain))
 255                 return BCME_RANGE;
 256
 257         /* if nrate override is configured to be non-SISO STF mode, reject reducing txchain to 1 */
 258         txstreams = (u8) WLC_BITSCNT(txchain);
 259         if (txstreams > MAX_STREAMS_SUPPORTED)
 260                 return BCME_RANGE;
 261
 262         if (txstreams == 1) {
 263                 for (i = 0; i < NBANDS(wlc); i++)
 264                         if ((RSPEC_STF(wlc->bandstate[i]->rspec_override) !=
 265                              PHY_TXC1_MODE_SISO)
 266                             || (RSPEC_STF(wlc->bandstate[i]->mrspec_override) !=
 267                                 PHY_TXC1_MODE_SISO)) {
 268                                 if (!force)
 269                                         return BCME_ERROR;
 270
 271                                 /* over-write the override rspec */
 272                                 if (RSPEC_STF(wlc->bandstate[i]->rspec_override)
 273                                     != PHY_TXC1_MODE_SISO) {
 274                                         wlc->bandstate[i]->rspec_override = 0;
 275                                         WL_ERROR("%s(): temp sense override non-SISO rspec_override\n",
 276                                                  __func__);
 277                                 }
 278                                 if (RSPEC_STF
 279                                     (wlc->bandstate[i]->mrspec_override) !=
 280                                     PHY_TXC1_MODE_SISO) {
 281                                         wlc->bandstate[i]->mrspec_override = 0;
 282                                         WL_ERROR("%s(): temp sense override non-SISO mrspec_override\n",
 283                                                  __func__);
 284                                 }
 285                         }
 286         }
 287
 288         wlc->stf->txchain = txchain;
 289         wlc->stf->txstreams = txstreams;
 290         wlc_stf_stbc_tx_set(wlc, wlc->band->band_stf_stbc_tx);
 291         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
 292         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
 293         wlc->stf->txant =
 294             (wlc->stf->txstreams == 1) ? ANT_TX_FORCE_0 : ANT_TX_DEF;
 295         _wlc_stf_phy_txant_upd(wlc);
 296
 297         wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain,
 298                               wlc->stf->rxchain);
 299
 300         for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++)
 301                 wlc_stf_txcore_set(wlc, (u8) i, txcore_default[i]);
 302
 303         return BCME_OK;
 304 }
 305
 306 /* update wlc->stf->ss_opmode which represents the operational stf_ss mode we're using */
 307 int wlc_stf_ss_update(struct wlc_info *wlc, struct wlcband *band)
 308 {
 309         int ret_code = 0;
 310         u8 prev_stf_ss;
 311         u8 upd_stf_ss;
 312
 313         prev_stf_ss = wlc->stf->ss_opmode;
 314
 315         /* NOTE: opmode can only be SISO or CDD as STBC is decided on a per-packet basis */
 316         if (WLC_STBC_CAP_PHY(wlc) &&
 317             wlc->stf->ss_algosel_auto
 318             && (wlc->stf->ss_algo_channel != (u16) -1)) {
 319                 ASSERT(isset(&wlc->stf->ss_algo_channel, PHY_TXC1_MODE_CDD)
 320                        || isset(&wlc->stf->ss_algo_channel,
 321                                 PHY_TXC1_MODE_SISO));
 322                 upd_stf_ss = (wlc->stf->no_cddstbc || (wlc->stf->txstreams == 1)
 323                               || isset(&wlc->stf->ss_algo_channel,
 324                                        PHY_TXC1_MODE_SISO)) ? PHY_TXC1_MODE_SISO
 325                     : PHY_TXC1_MODE_CDD;
 326         } else {
 327                 if (wlc->band != band)
 328                         return ret_code;
 329                 upd_stf_ss = (wlc->stf->no_cddstbc
 330                               || (wlc->stf->txstreams ==
 331                                   1)) ? PHY_TXC1_MODE_SISO : band->
 332                     band_stf_ss_mode;
 333         }
 334         if (prev_stf_ss != upd_stf_ss) {
 335                 wlc->stf->ss_opmode = upd_stf_ss;
 336                 wlc_bmac_band_stf_ss_set(wlc->hw, upd_stf_ss);
 337         }
 338
 339         return ret_code;
 340 }
 341
 342 int wlc_stf_attach(struct wlc_info *wlc)
 343 {
 344         wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_SISO;
 345         wlc->bandstate[BAND_5G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_CDD;
 346
 347         if (WLCISNPHY(wlc->band) &&
 348             (wlc_phy_txpower_hw_ctrl_get(wlc->band->pi) != PHY_TPC_HW_ON))
 349                 wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode =
 350                     PHY_TXC1_MODE_CDD;
 351         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
 352         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
 353
 354         wlc_stf_stbc_rx_ht_update(wlc, HT_CAP_RX_STBC_NO);
 355         wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = OFF;
 356         wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = OFF;
 357
 358         if (WLC_STBC_CAP_PHY(wlc)) {
 359                 wlc->stf->ss_algosel_auto = true;
 360                 wlc->stf->ss_algo_channel = (u16) -1;   /* Init the default value */
 361         }
 362         return 0;
 363 }
 364
 365 void wlc_stf_detach(struct wlc_info *wlc)
 366 {
 367 }
 368
 369 int wlc_stf_ant_txant_validate(struct wlc_info *wlc, s8 val)
 370 {
 371         int bcmerror = BCME_OK;
 372
 373         /* when there is only 1 tx_streams, don't allow to change the txant */
 374         if (WLCISNPHY(wlc->band) && (wlc->stf->txstreams == 1))
 375                 return ((val == wlc->stf->txant) ? bcmerror : BCME_RANGE);
 376
 377         switch (val) {
 378         case -1:
 379                 val = ANT_TX_DEF;
 380                 break;
 381         case 0:
 382                 val = ANT_TX_FORCE_0;
 383                 break;
 384         case 1:
 385                 val = ANT_TX_FORCE_1;
 386                 break;
 387         case 3:
 388                 val = ANT_TX_LAST_RX;
 389                 break;
 390         default:
 391                 bcmerror = BCME_RANGE;
 392                 break;
 393         }
 394
 395         if (bcmerror == BCME_OK)
 396                 wlc->stf->txant = (s8) val;
 397
 398         return bcmerror;
 399
 400 }
 401
 402 /*
 403  * Centralized txant update function. call it whenever wlc->stf->txant and/or wlc->stf->txchain
 404  *  change
 405  *
 406  * Antennas are controlled by ucode indirectly, which drives PHY or GPIO to
 407  *   achieve various tx/rx antenna selection schemes
 408  *
 409  * legacy phy, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7 means auto(last rx)
 410  * for NREV<3, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7 means last rx and
 411  *    do tx-antenna selection for SISO transmissions
 412  * for NREV=3, bit 6 and bit _8_ means antenna 0 and 1 respectively, bit6+bit7 means last rx and
 413  *    do tx-antenna selection for SISO transmissions
 414  * for NREV>=7, bit 6 and bit 7 mean antenna 0 and 1 respectively, nit6+bit7 means both cores active
 415 */
 416 static void _wlc_stf_phy_txant_upd(struct wlc_info *wlc)
 417 {
 418         s8 txant;
 419
 420         txant = (s8) wlc->stf->txant;
 421         ASSERT(txant == ANT_TX_FORCE_0 || txant == ANT_TX_FORCE_1
 422                || txant == ANT_TX_LAST_RX);
 423
 424         if (WLC_PHY_11N_CAP(wlc->band)) {
 425                 if (txant == ANT_TX_FORCE_0) {
 426                         wlc->stf->phytxant = PHY_TXC_ANT_0;
 427                 } else if (txant == ANT_TX_FORCE_1) {
 428                         wlc->stf->phytxant = PHY_TXC_ANT_1;
 429
 430                         if (WLCISNPHY(wlc->band) &&
 431                             NREV_GE(wlc->band->phyrev, 3)
 432                             && NREV_LT(wlc->band->phyrev, 7)) {
 433                                 wlc->stf->phytxant = PHY_TXC_ANT_2;
 434                         }
 435                 } else {
 436                         if (WLCISLCNPHY(wlc->band) || WLCISSSLPNPHY(wlc->band))
 437                                 wlc->stf->phytxant = PHY_TXC_LCNPHY_ANT_LAST;
 438                         else {
 439                                 /* keep this assert to catch out of sync wlc->stf->txcore */
 440                                 ASSERT(wlc->stf->txchain > 0);
 441                                 wlc->stf->phytxant =
 442                                     wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 443                         }
 444                 }
 445         } else {
 446                 if (txant == ANT_TX_FORCE_0)
 447                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_0;
 448                 else if (txant == ANT_TX_FORCE_1)
 449                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_1;
 450                 else
 451                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_LAST;
 452         }
 453
 454         wlc_bmac_txant_set(wlc->hw, wlc->stf->phytxant);
 455 }
 456
 457 void wlc_stf_phy_txant_upd(struct wlc_info *wlc)
 458 {
 459         _wlc_stf_phy_txant_upd(wlc);
 460 }
 461
 462 void wlc_stf_phy_chain_calc(struct wlc_info *wlc)
 463 {
 464         /* get available rx/tx chains */
 465         wlc->stf->hw_txchain = (u8) getintvar(wlc->pub->vars, "txchain");
 466         wlc->stf->hw_rxchain = (u8) getintvar(wlc->pub->vars, "rxchain");
 467
 468         /* these parameter are intended to be used for all PHY types */
 469         if (wlc->stf->hw_txchain == 0 || wlc->stf->hw_txchain == 0xf) {
 470                 if (WLCISNPHY(wlc->band)) {
 471                         wlc->stf->hw_txchain = TXCHAIN_DEF_NPHY;
 472                 } else {
 473                         wlc->stf->hw_txchain = TXCHAIN_DEF;
 474                 }
 475         }
 476
 477         wlc->stf->txchain = wlc->stf->hw_txchain;
 478         wlc->stf->txstreams = (u8) WLC_BITSCNT(wlc->stf->hw_txchain);
 479
 480         if (wlc->stf->hw_rxchain == 0 || wlc->stf->hw_rxchain == 0xf) {
 481                 if (WLCISNPHY(wlc->band)) {
 482                         wlc->stf->hw_rxchain = RXCHAIN_DEF_NPHY;
 483                 } else {
 484                         wlc->stf->hw_rxchain = RXCHAIN_DEF;
 485                 }
 486         }
 487
 488         wlc->stf->rxchain = wlc->stf->hw_rxchain;
 489         wlc->stf->rxstreams = (u8) WLC_BITSCNT(wlc->stf->hw_rxchain);
 490
 491         /* initialize the txcore table */
 492         bcopy(txcore_default, wlc->stf->txcore, sizeof(wlc->stf->txcore));
 493
 494         /* default spatial_policy */
 495         wlc->stf->spatial_policy = MIN_SPATIAL_EXPANSION;
 496         wlc_stf_spatial_policy_set(wlc, MIN_SPATIAL_EXPANSION);
 497 }
 498
 499 static u16 _wlc_stf_phytxchain_sel(struct wlc_info *wlc, ratespec_t rspec)
 500 {
 501         u16 phytxant = wlc->stf->phytxant;
 502
 503         if (RSPEC_STF(rspec) != PHY_TXC1_MODE_SISO) {
 504                 ASSERT(wlc->stf->txstreams > 1);
 505                 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 506         } else if (wlc->stf->txant == ANT_TX_DEF)
 507                 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 508         phytxant &= PHY_TXC_ANT_MASK;
 509         return phytxant;
 510 }
 511
 512 u16 wlc_stf_phytxchain_sel(struct wlc_info *wlc, ratespec_t rspec)
 513 {
 514         return _wlc_stf_phytxchain_sel(wlc, rspec);
 515 }
 516
 517 u16 wlc_stf_d11hdrs_phyctl_txant(struct wlc_info *wlc, ratespec_t rspec)
 518 {
 519         u16 phytxant = wlc->stf->phytxant;
 520         u16 mask = PHY_TXC_ANT_MASK;
 521
 522         /* for non-siso rates or default setting, use the available chains */
 523         if (WLCISNPHY(wlc->band)) {
 524                 ASSERT(wlc->stf->txchain != 0);
 525                 phytxant = _wlc_stf_phytxchain_sel(wlc, rspec);
 526                 mask = PHY_TXC_HTANT_MASK;
 527         }
 528         phytxant |= phytxant & mask;
 529         return phytxant;
 530 }