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
  20 #include <bcmdefs.h>
  21 #include <bcmutils.h>
  22 #include <aiutils.h>
  23 #include <bcmwifi.h>
  24 #include <bcmnvram.h>
  25 #include "bcmdma.h"
  26
  27 #include "wlc_types.h"
  28 #include "d11.h"
  29 #include "wlc_cfg.h"
  30 #include "wlc_rate.h"
  31 #include "wlc_scb.h"
  32 #include "wlc_pub.h"
  33 #include "wlc_key.h"
  34 #include "phy/wlc_phy_hal.h"
  35 #include "wlc_channel.h"
  36 #include "wlc_main.h"
  37 #include "wlc_bmac.h"
  38 #include "wlc_stf.h"
  39
  40 #define MIN_SPATIAL_EXPANSION   0
  41 #define MAX_SPATIAL_EXPANSION   1
  42
  43 #define WLC_STF_SS_STBC_RX(wlc) (WLCISNPHY(wlc->band) && \
  44         NREV_GT(wlc->band->phyrev, 3) && NREV_LE(wlc->band->phyrev, 6))
  45
  46 static bool wlc_stf_stbc_tx_set(struct wlc_info *wlc, s32 int_val);
  47 static int wlc_stf_txcore_set(struct wlc_info *wlc, u8 Nsts, u8 val);
  48 static int wlc_stf_spatial_policy_set(struct wlc_info *wlc, int val);
  49 static void wlc_stf_stbc_rx_ht_update(struct wlc_info *wlc, int val);
  50
  51 static void _wlc_stf_phy_txant_upd(struct wlc_info *wlc);
  52 static u16 _wlc_stf_phytxchain_sel(struct wlc_info *wlc, ratespec_t rspec);
  53
  54 #define NSTS_1  1
  55 #define NSTS_2  2
  56 #define NSTS_3  3
  57 #define NSTS_4  4
  58 const u8 txcore_default[5] = {
  59         (0),                    /* bitmap of the core enabled */
  60         (0x01),                 /* For Nsts = 1, enable core 1 */
  61         (0x03),                 /* For Nsts = 2, enable core 1 & 2 */
  62         (0x07),                 /* For Nsts = 3, enable core 1, 2 & 3 */
  63         (0x0f)                  /* For Nsts = 4, enable all cores */
  64 };
  65
  66 static void wlc_stf_stbc_rx_ht_update(struct wlc_info *wlc, int val)
  67 {
  68         /* MIMOPHYs rev3-6 cannot receive STBC with only one rx core active */
  69         if (WLC_STF_SS_STBC_RX(wlc)) {
  70                 if ((wlc->stf->rxstreams == 1) && (val != HT_CAP_RX_STBC_NO))
  71                         return;
  72         }
  73
  74         wlc->ht_cap.cap_info &= ~IEEE80211_HT_CAP_RX_STBC;
  75         wlc->ht_cap.cap_info |= (val << IEEE80211_HT_CAP_RX_STBC_SHIFT);
  76
  77         if (wlc->pub->up) {
  78                 wlc_update_beacon(wlc);
  79                 wlc_update_probe_resp(wlc, true);
  80         }
  81 }
  82
  83 /* every WLC_TEMPSENSE_PERIOD seconds temperature check to decide whether to turn on/off txchain */
  84 void wlc_tempsense_upd(struct wlc_info *wlc)
  85 {
  86         wlc_phy_t *pi = wlc->band->pi;
  87         uint active_chains, txchain;
  88
  89         /* Check if the chip is too hot. Disable one Tx chain, if it is */
  90         /* high 4 bits are for Rx chain, low 4 bits are  for Tx chain */
  91         active_chains = wlc_phy_stf_chain_active_get(pi);
  92         txchain = active_chains & 0xf;
  93
  94         if (wlc->stf->txchain == wlc->stf->hw_txchain) {
  95                 if (txchain && (txchain < wlc->stf->hw_txchain)) {
  96                         /* turn off 1 tx chain */
  97                         wlc_stf_txchain_set(wlc, txchain, true);
  98                 }
  99         } else if (wlc->stf->txchain < wlc->stf->hw_txchain) {
 100                 if (txchain == wlc->stf->hw_txchain) {
 101                         /* turn back on txchain */
 102                         wlc_stf_txchain_set(wlc, txchain, true);
 103                 }
 104         }
 105 }
 106
 107 void
 108 wlc_stf_ss_algo_channel_get(struct wlc_info *wlc, u16 *ss_algo_channel,
 109                             chanspec_t chanspec)
 110 {
 111         tx_power_t power;
 112         u8 siso_mcs_id, cdd_mcs_id, stbc_mcs_id;
 113
 114         /* Clear previous settings */
 115         *ss_algo_channel = 0;
 116
 117         if (!wlc->pub->up) {
 118                 *ss_algo_channel = (u16) -1;
 119                 return;
 120         }
 121
 122         wlc_phy_txpower_get_current(wlc->band->pi, &power,
 123                                     CHSPEC_CHANNEL(chanspec));
 124
 125         siso_mcs_id = (CHSPEC_IS40(chanspec)) ?
 126             WL_TX_POWER_MCS40_SISO_FIRST : WL_TX_POWER_MCS20_SISO_FIRST;
 127         cdd_mcs_id = (CHSPEC_IS40(chanspec)) ?
 128             WL_TX_POWER_MCS40_CDD_FIRST : WL_TX_POWER_MCS20_CDD_FIRST;
 129         stbc_mcs_id = (CHSPEC_IS40(chanspec)) ?
 130             WL_TX_POWER_MCS40_STBC_FIRST : WL_TX_POWER_MCS20_STBC_FIRST;
 131
 132         /* criteria to choose stf mode */
 133
 134         /* the "+3dbm (12 0.25db units)" is to account for the fact that with CDD, tx occurs
 135          * on both chains
 136          */
 137         if (power.target[siso_mcs_id] > (power.target[cdd_mcs_id] + 12))
 138                 setbit(ss_algo_channel, PHY_TXC1_MODE_SISO);
 139         else
 140                 setbit(ss_algo_channel, PHY_TXC1_MODE_CDD);
 141
 142         /* STBC is ORed into to algo channel as STBC requires per-packet SCB capability check
 143          * so cannot be default mode of operation. One of SISO, CDD have to be set
 144          */
 145         if (power.target[siso_mcs_id] <= (power.target[stbc_mcs_id] + 12))
 146                 setbit(ss_algo_channel, PHY_TXC1_MODE_STBC);
 147 }
 148
 149 static bool wlc_stf_stbc_tx_set(struct wlc_info *wlc, s32 int_val)
 150 {
 151         if ((int_val != AUTO) && (int_val != OFF) && (int_val != ON)) {
 152                 return false;
 153         }
 154
 155         if ((int_val == ON) && (wlc->stf->txstreams == 1))
 156                 return false;
 157
 158         if ((int_val == OFF) || (wlc->stf->txstreams == 1)
 159             || !WLC_STBC_CAP_PHY(wlc))
 160                 wlc->ht_cap.cap_info &= ~IEEE80211_HT_CAP_TX_STBC;
 161         else
 162                 wlc->ht_cap.cap_info |= IEEE80211_HT_CAP_TX_STBC;
 163
 164         wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 165         wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 166
 167         return true;
 168 }
 169
 170 bool wlc_stf_stbc_rx_set(struct wlc_info *wlc, s32 int_val)
 171 {
 172         if ((int_val != HT_CAP_RX_STBC_NO)
 173             && (int_val != HT_CAP_RX_STBC_ONE_STREAM)) {
 174                 return false;
 175         }
 176
 177         if (WLC_STF_SS_STBC_RX(wlc)) {
 178                 if ((int_val != HT_CAP_RX_STBC_NO)
 179                     && (wlc->stf->rxstreams == 1))
 180                         return false;
 181         }
 182
 183         wlc_stf_stbc_rx_ht_update(wlc, int_val);
 184         return true;
 185 }
 186
 187 static int wlc_stf_txcore_set(struct wlc_info *wlc, u8 Nsts, u8 core_mask)
 188 {
 189         BCMMSG(wlc->wiphy, "wl%d: Nsts %d core_mask %x\n",
 190                  wlc->pub->unit, Nsts, core_mask);
 191
 192         if (WLC_BITSCNT(core_mask) > wlc->stf->txstreams) {
 193                 core_mask = 0;
 194         }
 195
 196         if ((WLC_BITSCNT(core_mask) == wlc->stf->txstreams) &&
 197             ((core_mask & ~wlc->stf->txchain)
 198              || !(core_mask & wlc->stf->txchain))) {
 199                 core_mask = wlc->stf->txchain;
 200         }
 201
 202         wlc->stf->txcore[Nsts] = core_mask;
 203         /* Nsts = 1..4, txcore index = 1..4 */
 204         if (Nsts == 1) {
 205                 /* Needs to update beacon and ucode generated response
 206                  * frames when 1 stream core map changed
 207                  */
 208                 wlc->stf->phytxant = core_mask << PHY_TXC_ANT_SHIFT;
 209                 wlc_bmac_txant_set(wlc->hw, wlc->stf->phytxant);
 210                 if (wlc->clk) {
 211                         wlc_suspend_mac_and_wait(wlc);
 212                         wlc_beacon_phytxctl_txant_upd(wlc, wlc->bcn_rspec);
 213                         wlc_enable_mac(wlc);
 214                 }
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int wlc_stf_spatial_policy_set(struct wlc_info *wlc, int val)
 221 {
 222         int i;
 223         u8 core_mask = 0;
 224
 225         BCMMSG(wlc->wiphy, "wl%d: val %x\n", wlc->pub->unit, val);
 226
 227         wlc->stf->spatial_policy = (s8) val;
 228         for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++) {
 229                 core_mask = (val == MAX_SPATIAL_EXPANSION) ?
 230                     wlc->stf->txchain : txcore_default[i];
 231                 wlc_stf_txcore_set(wlc, (u8) i, core_mask);
 232         }
 233         return 0;
 234 }
 235
 236 int wlc_stf_txchain_set(struct wlc_info *wlc, s32 int_val, bool force)
 237 {
 238         u8 txchain = (u8) int_val;
 239         u8 txstreams;
 240         uint i;
 241
 242         if (wlc->stf->txchain == txchain)
 243                 return 0;
 244
 245         if ((txchain & ~wlc->stf->hw_txchain)
 246             || !(txchain & wlc->stf->hw_txchain))
 247                 return -EINVAL;
 248
 249         /* if nrate override is configured to be non-SISO STF mode, reject reducing txchain to 1 */
 250         txstreams = (u8) WLC_BITSCNT(txchain);
 251         if (txstreams > MAX_STREAMS_SUPPORTED)
 252                 return -EINVAL;
 253
 254         if (txstreams == 1) {
 255                 for (i = 0; i < NBANDS(wlc); i++)
 256                         if ((RSPEC_STF(wlc->bandstate[i]->rspec_override) !=
 257                              PHY_TXC1_MODE_SISO)
 258                             || (RSPEC_STF(wlc->bandstate[i]->mrspec_override) !=
 259                                 PHY_TXC1_MODE_SISO)) {
 260                                 if (!force)
 261                                         return -EBADE;
 262
 263                                 /* over-write the override rspec */
 264                                 if (RSPEC_STF(wlc->bandstate[i]->rspec_override)
 265                                     != PHY_TXC1_MODE_SISO) {
 266                                         wlc->bandstate[i]->rspec_override = 0;
 267                                         wiphy_err(wlc->wiphy, "%s(): temp "
 268                                                   "sense override non-SISO "
 269                                                   "rspec_override\n",
 270                                                   __func__);
 271                                 }
 272                                 if (RSPEC_STF
 273                                     (wlc->bandstate[i]->mrspec_override) !=
 274                                     PHY_TXC1_MODE_SISO) {
 275                                         wlc->bandstate[i]->mrspec_override = 0;
 276                                         wiphy_err(wlc->wiphy, "%s(): temp "
 277                                                   "sense override non-SISO "
 278                                                   "mrspec_override\n",
 279                                                   __func__);
 280                                 }
 281                         }
 282         }
 283
 284         wlc->stf->txchain = txchain;
 285         wlc->stf->txstreams = txstreams;
 286         wlc_stf_stbc_tx_set(wlc, wlc->band->band_stf_stbc_tx);
 287         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
 288         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
 289         wlc->stf->txant =
 290             (wlc->stf->txstreams == 1) ? ANT_TX_FORCE_0 : ANT_TX_DEF;
 291         _wlc_stf_phy_txant_upd(wlc);
 292
 293         wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain,
 294                               wlc->stf->rxchain);
 295
 296         for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++)
 297                 wlc_stf_txcore_set(wlc, (u8) i, txcore_default[i]);
 298
 299         return 0;
 300 }
 301
 302 /* update wlc->stf->ss_opmode which represents the operational stf_ss mode we're using */
 303 int wlc_stf_ss_update(struct wlc_info *wlc, struct wlcband *band)
 304 {
 305         int ret_code = 0;
 306         u8 prev_stf_ss;
 307         u8 upd_stf_ss;
 308
 309         prev_stf_ss = wlc->stf->ss_opmode;
 310
 311         /* NOTE: opmode can only be SISO or CDD as STBC is decided on a per-packet basis */
 312         if (WLC_STBC_CAP_PHY(wlc) &&
 313             wlc->stf->ss_algosel_auto
 314             && (wlc->stf->ss_algo_channel != (u16) -1)) {
 315                 upd_stf_ss = (wlc->stf->no_cddstbc || (wlc->stf->txstreams == 1)
 316                               || isset(&wlc->stf->ss_algo_channel,
 317                                        PHY_TXC1_MODE_SISO)) ? PHY_TXC1_MODE_SISO
 318                     : PHY_TXC1_MODE_CDD;
 319         } else {
 320                 if (wlc->band != band)
 321                         return ret_code;
 322                 upd_stf_ss = (wlc->stf->no_cddstbc
 323                               || (wlc->stf->txstreams ==
 324                                   1)) ? PHY_TXC1_MODE_SISO : band->
 325                     band_stf_ss_mode;
 326         }
 327         if (prev_stf_ss != upd_stf_ss) {
 328                 wlc->stf->ss_opmode = upd_stf_ss;
 329                 wlc_bmac_band_stf_ss_set(wlc->hw, upd_stf_ss);
 330         }
 331
 332         return ret_code;
 333 }
 334
 335 int wlc_stf_attach(struct wlc_info *wlc)
 336 {
 337         wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_SISO;
 338         wlc->bandstate[BAND_5G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_CDD;
 339
 340         if (WLCISNPHY(wlc->band) &&
 341             (wlc_phy_txpower_hw_ctrl_get(wlc->band->pi) != PHY_TPC_HW_ON))
 342                 wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode =
 343                     PHY_TXC1_MODE_CDD;
 344         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
 345         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
 346
 347         wlc_stf_stbc_rx_ht_update(wlc, HT_CAP_RX_STBC_NO);
 348         wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = OFF;
 349         wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = OFF;
 350
 351         if (WLC_STBC_CAP_PHY(wlc)) {
 352                 wlc->stf->ss_algosel_auto = true;
 353                 wlc->stf->ss_algo_channel = (u16) -1;   /* Init the default value */
 354         }
 355         return 0;
 356 }
 357
 358 void wlc_stf_detach(struct wlc_info *wlc)
 359 {
 360 }
 361
 362 /*
 363  * Centralized txant update function. call it whenever wlc->stf->txant and/or wlc->stf->txchain
 364  *  change
 365  *
 366  * Antennas are controlled by ucode indirectly, which drives PHY or GPIO to
 367  *   achieve various tx/rx antenna selection schemes
 368  *
 369  * legacy phy, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7 means auto(last rx)
 370  * for NREV<3, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7 means last rx and
 371  *    do tx-antenna selection for SISO transmissions
 372  * for NREV=3, bit 6 and bit _8_ means antenna 0 and 1 respectively, bit6+bit7 means last rx and
 373  *    do tx-antenna selection for SISO transmissions
 374  * for NREV>=7, bit 6 and bit 7 mean antenna 0 and 1 respectively, nit6+bit7 means both cores active
 375 */
 376 static void _wlc_stf_phy_txant_upd(struct wlc_info *wlc)
 377 {
 378         s8 txant;
 379
 380         txant = (s8) wlc->stf->txant;
 381         if (WLC_PHY_11N_CAP(wlc->band)) {
 382                 if (txant == ANT_TX_FORCE_0) {
 383                         wlc->stf->phytxant = PHY_TXC_ANT_0;
 384                 } else if (txant == ANT_TX_FORCE_1) {
 385                         wlc->stf->phytxant = PHY_TXC_ANT_1;
 386
 387                         if (WLCISNPHY(wlc->band) &&
 388                             NREV_GE(wlc->band->phyrev, 3)
 389                             && NREV_LT(wlc->band->phyrev, 7)) {
 390                                 wlc->stf->phytxant = PHY_TXC_ANT_2;
 391                         }
 392                 } else {
 393                         if (WLCISLCNPHY(wlc->band) || WLCISSSLPNPHY(wlc->band))
 394                                 wlc->stf->phytxant = PHY_TXC_LCNPHY_ANT_LAST;
 395                         else {
 396                                 /* catch out of sync wlc->stf->txcore */
 397                                 WARN_ON(wlc->stf->txchain <= 0);
 398                                 wlc->stf->phytxant =
 399                                     wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 400                         }
 401                 }
 402         } else {
 403                 if (txant == ANT_TX_FORCE_0)
 404                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_0;
 405                 else if (txant == ANT_TX_FORCE_1)
 406                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_1;
 407                 else
 408                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_LAST;
 409         }
 410
 411         wlc_bmac_txant_set(wlc->hw, wlc->stf->phytxant);
 412 }
 413
 414 void wlc_stf_phy_txant_upd(struct wlc_info *wlc)
 415 {
 416         _wlc_stf_phy_txant_upd(wlc);
 417 }
 418
 419 void wlc_stf_phy_chain_calc(struct wlc_info *wlc)
 420 {
 421         /* get available rx/tx chains */
 422         wlc->stf->hw_txchain = (u8) getintvar(wlc->pub->vars, "txchain");
 423         wlc->stf->hw_rxchain = (u8) getintvar(wlc->pub->vars, "rxchain");
 424
 425         /* these parameter are intended to be used for all PHY types */
 426         if (wlc->stf->hw_txchain == 0 || wlc->stf->hw_txchain == 0xf) {
 427                 if (WLCISNPHY(wlc->band)) {
 428                         wlc->stf->hw_txchain = TXCHAIN_DEF_NPHY;
 429                 } else {
 430                         wlc->stf->hw_txchain = TXCHAIN_DEF;
 431                 }
 432         }
 433
 434         wlc->stf->txchain = wlc->stf->hw_txchain;
 435         wlc->stf->txstreams = (u8) WLC_BITSCNT(wlc->stf->hw_txchain);
 436
 437         if (wlc->stf->hw_rxchain == 0 || wlc->stf->hw_rxchain == 0xf) {
 438                 if (WLCISNPHY(wlc->band)) {
 439                         wlc->stf->hw_rxchain = RXCHAIN_DEF_NPHY;
 440                 } else {
 441                         wlc->stf->hw_rxchain = RXCHAIN_DEF;
 442                 }
 443         }
 444
 445         wlc->stf->rxchain = wlc->stf->hw_rxchain;
 446         wlc->stf->rxstreams = (u8) WLC_BITSCNT(wlc->stf->hw_rxchain);
 447
 448         /* initialize the txcore table */
 449         memcpy(wlc->stf->txcore, txcore_default, sizeof(wlc->stf->txcore));
 450
 451         /* default spatial_policy */
 452         wlc->stf->spatial_policy = MIN_SPATIAL_EXPANSION;
 453         wlc_stf_spatial_policy_set(wlc, MIN_SPATIAL_EXPANSION);
 454 }
 455
 456 static u16 _wlc_stf_phytxchain_sel(struct wlc_info *wlc, ratespec_t rspec)
 457 {
 458         u16 phytxant = wlc->stf->phytxant;
 459
 460         if (RSPEC_STF(rspec) != PHY_TXC1_MODE_SISO) {
 461                 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 462         } else if (wlc->stf->txant == ANT_TX_DEF)
 463                 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 464         phytxant &= PHY_TXC_ANT_MASK;
 465         return phytxant;
 466 }
 467
 468 u16 wlc_stf_phytxchain_sel(struct wlc_info *wlc, ratespec_t rspec)
 469 {
 470         return _wlc_stf_phytxchain_sel(wlc, rspec);
 471 }
 472
 473 u16 wlc_stf_d11hdrs_phyctl_txant(struct wlc_info *wlc, ratespec_t rspec)
 474 {
 475         u16 phytxant = wlc->stf->phytxant;
 476         u16 mask = PHY_TXC_ANT_MASK;
 477
 478         /* for non-siso rates or default setting, use the available chains */
 479         if (WLCISNPHY(wlc->band)) {
 480                 phytxant = _wlc_stf_phytxchain_sel(wlc, rspec);
 481                 mask = PHY_TXC_HTANT_MASK;
 482         }
 483         phytxant |= phytxant & mask;
 484         return phytxant;
 485 }