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 <proto/802.11.h>
  25 #include <wlioctl.h>
  26 #include <bcmwifi.h>
  27 #include <sbhndpio.h>
  28 #include <sbhnddma.h>
  29 #include <d11.h>
  30 #include <wlc_rate.h>
  31 #include <wlc_pub.h>
  32 #include <wlc_key.h>
  33 #include <wlc_channel.h>
  34 #include <wlc_bsscfg.h>
  35 #include <wlc_mac80211.h>
  36 #include <wlc_scb.h>
  37 #include <wl_export.h>
  38 #include <wlc_bmac.h>
  39 #include <wlc_stf.h>
  40 #include <wl_dbg.h>
  41
  42 #define MIN_SPATIAL_EXPANSION   0
  43 #define MAX_SPATIAL_EXPANSION   1
  44
  45 #define WLC_STF_SS_STBC_RX(wlc) (WLCISNPHY(wlc->band) && \
  46         NREV_GT(wlc->band->phyrev, 3) && NREV_LE(wlc->band->phyrev, 6))
  47
  48 static bool wlc_stf_stbc_tx_set(struct wlc_info *wlc, s32 int_val);
  49 static int wlc_stf_txcore_set(struct wlc_info *wlc, u8 Nsts, u8 val);
  50 static int wlc_stf_spatial_policy_set(struct wlc_info *wlc, int val);
  51 static void wlc_stf_stbc_rx_ht_update(struct wlc_info *wlc, int val);
  52
  53 static void _wlc_stf_phy_txant_upd(struct wlc_info *wlc);
  54 static u16 _wlc_stf_phytxchain_sel(struct wlc_info *wlc, ratespec_t rspec);
  55
  56 #define NSTS_1  1
  57 #define NSTS_2  2
  58 #define NSTS_3  3
  59 #define NSTS_4  4
  60 const u8 txcore_default[5] = {
  61         (0),                    /* bitmap of the core enabled */
  62         (0x01),                 /* For Nsts = 1, enable core 1 */
  63         (0x03),                 /* For Nsts = 2, enable core 1 & 2 */
  64         (0x07),                 /* For Nsts = 3, enable core 1, 2 & 3 */
  65         (0x0f)                  /* For Nsts = 4, enable all cores */
  66 };
  67
  68 static void wlc_stf_stbc_rx_ht_update(struct wlc_info *wlc, int val)
  69 {
  70         ASSERT((val == HT_CAP_RX_STBC_NO)
  71                || (val == HT_CAP_RX_STBC_ONE_STREAM));
  72
  73         /* MIMOPHYs rev3-6 cannot receive STBC with only one rx core active */
  74         if (WLC_STF_SS_STBC_RX(wlc)) {
  75                 if ((wlc->stf->rxstreams == 1) && (val != HT_CAP_RX_STBC_NO))
  76                         return;
  77         }
  78
  79         wlc->ht_cap.cap_info &= ~HT_CAP_RX_STBC_MASK;
  80         wlc->ht_cap.cap_info |= (val << HT_CAP_RX_STBC_SHIFT);
  81
  82         if (wlc->pub->up) {
  83                 wlc_update_beacon(wlc);
  84                 wlc_update_probe_resp(wlc, true);
  85         }
  86 }
  87
  88 /* every WLC_TEMPSENSE_PERIOD seconds temperature check to decide whether to turn on/off txchain */
  89 void wlc_tempsense_upd(struct wlc_info *wlc)
  90 {
  91         wlc_phy_t *pi = wlc->band->pi;
  92         uint active_chains, txchain;
  93
  94         /* Check if the chip is too hot. Disable one Tx chain, if it is */
  95         /* high 4 bits are for Rx chain, low 4 bits are  for Tx chain */
  96         active_chains = wlc_phy_stf_chain_active_get(pi);
  97         txchain = active_chains & 0xf;
  98
  99         if (wlc->stf->txchain == wlc->stf->hw_txchain) {
 100                 if (txchain && (txchain < wlc->stf->hw_txchain)) {
 101                         /* turn off 1 tx chain */
 102                         wlc_stf_txchain_set(wlc, txchain, true);
 103                 }
 104         } else if (wlc->stf->txchain < wlc->stf->hw_txchain) {
 105                 if (txchain == wlc->stf->hw_txchain) {
 106                         /* turn back on txchain */
 107                         wlc_stf_txchain_set(wlc, txchain, true);
 108                 }
 109         }
 110 }
 111
 112 void
 113 wlc_stf_ss_algo_channel_get(struct wlc_info *wlc, u16 *ss_algo_channel,
 114                             chanspec_t chanspec)
 115 {
 116         tx_power_t power;
 117         u8 siso_mcs_id, cdd_mcs_id, stbc_mcs_id;
 118
 119         /* Clear previous settings */
 120         *ss_algo_channel = 0;
 121
 122         if (!wlc->pub->up) {
 123                 *ss_algo_channel = (u16) -1;
 124                 return;
 125         }
 126
 127         wlc_phy_txpower_get_current(wlc->band->pi, &power,
 128                                     CHSPEC_CHANNEL(chanspec));
 129
 130         siso_mcs_id = (CHSPEC_IS40(chanspec)) ?
 131             WL_TX_POWER_MCS40_SISO_FIRST : WL_TX_POWER_MCS20_SISO_FIRST;
 132         cdd_mcs_id = (CHSPEC_IS40(chanspec)) ?
 133             WL_TX_POWER_MCS40_CDD_FIRST : WL_TX_POWER_MCS20_CDD_FIRST;
 134         stbc_mcs_id = (CHSPEC_IS40(chanspec)) ?
 135             WL_TX_POWER_MCS40_STBC_FIRST : WL_TX_POWER_MCS20_STBC_FIRST;
 136
 137         /* criteria to choose stf mode */
 138
 139         /* the "+3dbm (12 0.25db units)" is to account for the fact that with CDD, tx occurs
 140          * on both chains
 141          */
 142         if (power.target[siso_mcs_id] > (power.target[cdd_mcs_id] + 12))
 143                 setbit(ss_algo_channel, PHY_TXC1_MODE_SISO);
 144         else
 145                 setbit(ss_algo_channel, PHY_TXC1_MODE_CDD);
 146
 147         /* STBC is ORed into to algo channel as STBC requires per-packet SCB capability check
 148          * so cannot be default mode of operation. One of SISO, CDD have to be set
 149          */
 150         if (power.target[siso_mcs_id] <= (power.target[stbc_mcs_id] + 12))
 151                 setbit(ss_algo_channel, PHY_TXC1_MODE_STBC);
 152 }
 153
 154 static bool wlc_stf_stbc_tx_set(struct wlc_info *wlc, s32 int_val)
 155 {
 156         if ((int_val != AUTO) && (int_val != OFF) && (int_val != ON)) {
 157                 return false;
 158         }
 159
 160         if ((int_val == ON) && (wlc->stf->txstreams == 1))
 161                 return false;
 162
 163         if ((int_val == OFF) || (wlc->stf->txstreams == 1)
 164             || !WLC_STBC_CAP_PHY(wlc))
 165                 wlc->ht_cap.cap_info &= ~IEEE80211_HT_CAP_TX_STBC;
 166         else
 167                 wlc->ht_cap.cap_info |= IEEE80211_HT_CAP_TX_STBC;
 168
 169         wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 170         wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 171
 172         return true;
 173 }
 174
 175 bool wlc_stf_stbc_rx_set(struct wlc_info *wlc, s32 int_val)
 176 {
 177         if ((int_val != HT_CAP_RX_STBC_NO)
 178             && (int_val != HT_CAP_RX_STBC_ONE_STREAM)) {
 179                 return false;
 180         }
 181
 182         if (WLC_STF_SS_STBC_RX(wlc)) {
 183                 if ((int_val != HT_CAP_RX_STBC_NO)
 184                     && (wlc->stf->rxstreams == 1))
 185                         return false;
 186         }
 187
 188         wlc_stf_stbc_rx_ht_update(wlc, int_val);
 189         return true;
 190 }
 191
 192 static int wlc_stf_txcore_set(struct wlc_info *wlc, u8 Nsts, u8 core_mask)
 193 {
 194         WL_TRACE("wl%d: %s: Nsts %d core_mask %x\n",
 195                  wlc->pub->unit, __func__, Nsts, core_mask);
 196
 197         ASSERT((Nsts > 0) && (Nsts <= MAX_STREAMS_SUPPORTED));
 198
 199         if (WLC_BITSCNT(core_mask) > wlc->stf->txstreams) {
 200                 core_mask = 0;
 201         }
 202
 203         if ((WLC_BITSCNT(core_mask) == wlc->stf->txstreams) &&
 204             ((core_mask & ~wlc->stf->txchain)
 205              || !(core_mask & wlc->stf->txchain))) {
 206                 core_mask = wlc->stf->txchain;
 207         }
 208
 209         ASSERT(!core_mask || Nsts <= WLC_BITSCNT(core_mask));
 210
 211         wlc->stf->txcore[Nsts] = core_mask;
 212         /* Nsts = 1..4, txcore index = 1..4 */
 213         if (Nsts == 1) {
 214                 /* Needs to update beacon and ucode generated response
 215                  * frames when 1 stream core map changed
 216                  */
 217                 wlc->stf->phytxant = core_mask << PHY_TXC_ANT_SHIFT;
 218                 wlc_bmac_txant_set(wlc->hw, wlc->stf->phytxant);
 219                 if (wlc->clk) {
 220                         wlc_suspend_mac_and_wait(wlc);
 221                         wlc_beacon_phytxctl_txant_upd(wlc, wlc->bcn_rspec);
 222                         wlc_enable_mac(wlc);
 223                 }
 224         }
 225
 226         return BCME_OK;
 227 }
 228
 229 static int wlc_stf_spatial_policy_set(struct wlc_info *wlc, int val)
 230 {
 231         int i;
 232         u8 core_mask = 0;
 233
 234         WL_TRACE("wl%d: %s: val %x\n", wlc->pub->unit, __func__, val);
 235
 236         wlc->stf->spatial_policy = (s8) val;
 237         for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++) {
 238                 core_mask = (val == MAX_SPATIAL_EXPANSION) ?
 239                     wlc->stf->txchain : txcore_default[i];
 240                 wlc_stf_txcore_set(wlc, (u8) i, core_mask);
 241         }
 242         return BCME_OK;
 243 }
 244
 245 int wlc_stf_txchain_set(struct wlc_info *wlc, s32 int_val, bool force)
 246 {
 247         u8 txchain = (u8) int_val;
 248         u8 txstreams;
 249         uint i;
 250
 251         if (wlc->stf->txchain == txchain)
 252                 return BCME_OK;
 253
 254         if ((txchain & ~wlc->stf->hw_txchain)
 255             || !(txchain & wlc->stf->hw_txchain))
 256                 return BCME_RANGE;
 257
 258         /* if nrate override is configured to be non-SISO STF mode, reject reducing txchain to 1 */
 259         txstreams = (u8) WLC_BITSCNT(txchain);
 260         if (txstreams > MAX_STREAMS_SUPPORTED)
 261                 return BCME_RANGE;
 262
 263         if (txstreams == 1) {
 264                 for (i = 0; i < NBANDS(wlc); i++)
 265                         if ((RSPEC_STF(wlc->bandstate[i]->rspec_override) !=
 266                              PHY_TXC1_MODE_SISO)
 267                             || (RSPEC_STF(wlc->bandstate[i]->mrspec_override) !=
 268                                 PHY_TXC1_MODE_SISO)) {
 269                                 if (!force)
 270                                         return BCME_ERROR;
 271
 272                                 /* over-write the override rspec */
 273                                 if (RSPEC_STF(wlc->bandstate[i]->rspec_override)
 274                                     != PHY_TXC1_MODE_SISO) {
 275                                         wlc->bandstate[i]->rspec_override = 0;
 276                                         WL_ERROR("%s(): temp sense override non-SISO rspec_override\n",
 277                                                  __func__);
 278                                 }
 279                                 if (RSPEC_STF
 280                                     (wlc->bandstate[i]->mrspec_override) !=
 281                                     PHY_TXC1_MODE_SISO) {
 282                                         wlc->bandstate[i]->mrspec_override = 0;
 283                                         WL_ERROR("%s(): temp sense override non-SISO mrspec_override\n",
 284                                                  __func__);
 285                                 }
 286                         }
 287         }
 288
 289         wlc->stf->txchain = txchain;
 290         wlc->stf->txstreams = txstreams;
 291         wlc_stf_stbc_tx_set(wlc, wlc->band->band_stf_stbc_tx);
 292         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
 293         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
 294         wlc->stf->txant =
 295             (wlc->stf->txstreams == 1) ? ANT_TX_FORCE_0 : ANT_TX_DEF;
 296         _wlc_stf_phy_txant_upd(wlc);
 297
 298         wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain,
 299                               wlc->stf->rxchain);
 300
 301         for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++)
 302                 wlc_stf_txcore_set(wlc, (u8) i, txcore_default[i]);
 303
 304         return BCME_OK;
 305 }
 306
 307 /* update wlc->stf->ss_opmode which represents the operational stf_ss mode we're using */
 308 int wlc_stf_ss_update(struct wlc_info *wlc, struct wlcband *band)
 309 {
 310         int ret_code = 0;
 311         u8 prev_stf_ss;
 312         u8 upd_stf_ss;
 313
 314         prev_stf_ss = wlc->stf->ss_opmode;
 315
 316         /* NOTE: opmode can only be SISO or CDD as STBC is decided on a per-packet basis */
 317         if (WLC_STBC_CAP_PHY(wlc) &&
 318             wlc->stf->ss_algosel_auto
 319             && (wlc->stf->ss_algo_channel != (u16) -1)) {
 320                 ASSERT(isset(&wlc->stf->ss_algo_channel, PHY_TXC1_MODE_CDD)
 321                        || isset(&wlc->stf->ss_algo_channel,
 322                                 PHY_TXC1_MODE_SISO));
 323                 upd_stf_ss = (wlc->stf->no_cddstbc || (wlc->stf->txstreams == 1)
 324                               || isset(&wlc->stf->ss_algo_channel,
 325                                        PHY_TXC1_MODE_SISO)) ? PHY_TXC1_MODE_SISO
 326                     : PHY_TXC1_MODE_CDD;
 327         } else {
 328                 if (wlc->band != band)
 329                         return ret_code;
 330                 upd_stf_ss = (wlc->stf->no_cddstbc
 331                               || (wlc->stf->txstreams ==
 332                                   1)) ? PHY_TXC1_MODE_SISO : band->
 333                     band_stf_ss_mode;
 334         }
 335         if (prev_stf_ss != upd_stf_ss) {
 336                 wlc->stf->ss_opmode = upd_stf_ss;
 337                 wlc_bmac_band_stf_ss_set(wlc->hw, upd_stf_ss);
 338         }
 339
 340         return ret_code;
 341 }
 342
 343 int wlc_stf_attach(struct wlc_info *wlc)
 344 {
 345         wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_SISO;
 346         wlc->bandstate[BAND_5G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_CDD;
 347
 348         if (WLCISNPHY(wlc->band) &&
 349             (wlc_phy_txpower_hw_ctrl_get(wlc->band->pi) != PHY_TPC_HW_ON))
 350                 wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode =
 351                     PHY_TXC1_MODE_CDD;
 352         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
 353         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
 354
 355         wlc_stf_stbc_rx_ht_update(wlc, HT_CAP_RX_STBC_NO);
 356         wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = OFF;
 357         wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = OFF;
 358
 359         if (WLC_STBC_CAP_PHY(wlc)) {
 360                 wlc->stf->ss_algosel_auto = true;
 361                 wlc->stf->ss_algo_channel = (u16) -1;   /* Init the default value */
 362         }
 363         return 0;
 364 }
 365
 366 void wlc_stf_detach(struct wlc_info *wlc)
 367 {
 368 }
 369
 370 int wlc_stf_ant_txant_validate(struct wlc_info *wlc, s8 val)
 371 {
 372         int bcmerror = BCME_OK;
 373
 374         /* when there is only 1 tx_streams, don't allow to change the txant */
 375         if (WLCISNPHY(wlc->band) && (wlc->stf->txstreams == 1))
 376                 return ((val == wlc->stf->txant) ? bcmerror : BCME_RANGE);
 377
 378         switch (val) {
 379         case -1:
 380                 val = ANT_TX_DEF;
 381                 break;
 382         case 0:
 383                 val = ANT_TX_FORCE_0;
 384                 break;
 385         case 1:
 386                 val = ANT_TX_FORCE_1;
 387                 break;
 388         case 3:
 389                 val = ANT_TX_LAST_RX;
 390                 break;
 391         default:
 392                 bcmerror = BCME_RANGE;
 393                 break;
 394         }
 395
 396         if (bcmerror == BCME_OK)
 397                 wlc->stf->txant = (s8) val;
 398
 399         return bcmerror;
 400
 401 }
 402
 403 /*
 404  * Centralized txant update function. call it whenever wlc->stf->txant and/or wlc->stf->txchain
 405  *  change
 406  *
 407  * Antennas are controlled by ucode indirectly, which drives PHY or GPIO to
 408  *   achieve various tx/rx antenna selection schemes
 409  *
 410  * legacy phy, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7 means auto(last rx)
 411  * for NREV<3, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7 means last rx and
 412  *    do tx-antenna selection for SISO transmissions
 413  * for NREV=3, bit 6 and bit _8_ means antenna 0 and 1 respectively, bit6+bit7 means last rx and
 414  *    do tx-antenna selection for SISO transmissions
 415  * for NREV>=7, bit 6 and bit 7 mean antenna 0 and 1 respectively, nit6+bit7 means both cores active
 416 */
 417 static void _wlc_stf_phy_txant_upd(struct wlc_info *wlc)
 418 {
 419         s8 txant;
 420
 421         txant = (s8) wlc->stf->txant;
 422         ASSERT(txant == ANT_TX_FORCE_0 || txant == ANT_TX_FORCE_1
 423                || txant == ANT_TX_LAST_RX);
 424
 425         if (WLC_PHY_11N_CAP(wlc->band)) {
 426                 if (txant == ANT_TX_FORCE_0) {
 427                         wlc->stf->phytxant = PHY_TXC_ANT_0;
 428                 } else if (txant == ANT_TX_FORCE_1) {
 429                         wlc->stf->phytxant = PHY_TXC_ANT_1;
 430
 431                         if (WLCISNPHY(wlc->band) &&
 432                             NREV_GE(wlc->band->phyrev, 3)
 433                             && NREV_LT(wlc->band->phyrev, 7)) {
 434                                 wlc->stf->phytxant = PHY_TXC_ANT_2;
 435                         }
 436                 } else {
 437                         if (WLCISLCNPHY(wlc->band) || WLCISSSLPNPHY(wlc->band))
 438                                 wlc->stf->phytxant = PHY_TXC_LCNPHY_ANT_LAST;
 439                         else {
 440                                 /* keep this assert to catch out of sync wlc->stf->txcore */
 441                                 ASSERT(wlc->stf->txchain > 0);
 442                                 wlc->stf->phytxant =
 443                                     wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 444                         }
 445                 }
 446         } else {
 447                 if (txant == ANT_TX_FORCE_0)
 448                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_0;
 449                 else if (txant == ANT_TX_FORCE_1)
 450                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_1;
 451                 else
 452                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_LAST;
 453         }
 454
 455         wlc_bmac_txant_set(wlc->hw, wlc->stf->phytxant);
 456 }
 457
 458 void wlc_stf_phy_txant_upd(struct wlc_info *wlc)
 459 {
 460         _wlc_stf_phy_txant_upd(wlc);
 461 }
 462
 463 void wlc_stf_phy_chain_calc(struct wlc_info *wlc)
 464 {
 465         /* get available rx/tx chains */
 466         wlc->stf->hw_txchain = (u8) getintvar(wlc->pub->vars, "txchain");
 467         wlc->stf->hw_rxchain = (u8) getintvar(wlc->pub->vars, "rxchain");
 468
 469         /* these parameter are intended to be used for all PHY types */
 470         if (wlc->stf->hw_txchain == 0 || wlc->stf->hw_txchain == 0xf) {
 471                 if (WLCISNPHY(wlc->band)) {
 472                         wlc->stf->hw_txchain = TXCHAIN_DEF_NPHY;
 473                 } else {
 474                         wlc->stf->hw_txchain = TXCHAIN_DEF;
 475                 }
 476         }
 477
 478         wlc->stf->txchain = wlc->stf->hw_txchain;
 479         wlc->stf->txstreams = (u8) WLC_BITSCNT(wlc->stf->hw_txchain);
 480
 481         if (wlc->stf->hw_rxchain == 0 || wlc->stf->hw_rxchain == 0xf) {
 482                 if (WLCISNPHY(wlc->band)) {
 483                         wlc->stf->hw_rxchain = RXCHAIN_DEF_NPHY;
 484                 } else {
 485                         wlc->stf->hw_rxchain = RXCHAIN_DEF;
 486                 }
 487         }
 488
 489         wlc->stf->rxchain = wlc->stf->hw_rxchain;
 490         wlc->stf->rxstreams = (u8) WLC_BITSCNT(wlc->stf->hw_rxchain);
 491
 492         /* initialize the txcore table */
 493         memcpy(wlc->stf->txcore, txcore_default, sizeof(wlc->stf->txcore));
 494
 495         /* default spatial_policy */
 496         wlc->stf->spatial_policy = MIN_SPATIAL_EXPANSION;
 497         wlc_stf_spatial_policy_set(wlc, MIN_SPATIAL_EXPANSION);
 498 }
 499
 500 static u16 _wlc_stf_phytxchain_sel(struct wlc_info *wlc, ratespec_t rspec)
 501 {
 502         u16 phytxant = wlc->stf->phytxant;
 503
 504         if (RSPEC_STF(rspec) != PHY_TXC1_MODE_SISO) {
 505                 ASSERT(wlc->stf->txstreams > 1);
 506                 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 507         } else if (wlc->stf->txant == ANT_TX_DEF)
 508                 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 509         phytxant &= PHY_TXC_ANT_MASK;
 510         return phytxant;
 511 }
 512
 513 u16 wlc_stf_phytxchain_sel(struct wlc_info *wlc, ratespec_t rspec)
 514 {
 515         return _wlc_stf_phytxchain_sel(wlc, rspec);
 516 }
 517
 518 u16 wlc_stf_d11hdrs_phyctl_txant(struct wlc_info *wlc, ratespec_t rspec)
 519 {
 520         u16 phytxant = wlc->stf->phytxant;
 521         u16 mask = PHY_TXC_ANT_MASK;
 522
 523         /* for non-siso rates or default setting, use the available chains */
 524         if (WLCISNPHY(wlc->band)) {
 525                 ASSERT(wlc->stf->txchain != 0);
 526                 phytxant = _wlc_stf_phytxchain_sel(wlc, rspec);
 527                 mask = PHY_TXC_HTANT_MASK;
 528         }
 529         phytxant |= phytxant & mask;
 530         return phytxant;
 531 }