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 <sbdma.h>
  26
  27 #include "wlc_types.h"
  28 #include "d11.h"
  29 #include "wl_dbg.h"
  30 #include "wlc_cfg.h"
  31 #include "wlc_rate.h"
  32 #include "wlc_scb.h"
  33 #include "wlc_pub.h"
  34 #include "wlc_key.h"
  35 #include "phy/wlc_phy_hal.h"
  36 #include "wlc_channel.h"
  37 #include "wlc_main.h"
  38 #include "wl_export.h"
  39 #include "wlc_bmac.h"
  40 #include "wlc_stf.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         /* MIMOPHYs rev3-6 cannot receive STBC with only one rx core active */
  71         if (WLC_STF_SS_STBC_RX(wlc)) {
  72                 if ((wlc->stf->rxstreams == 1) && (val != HT_CAP_RX_STBC_NO))
  73                         return;
  74         }
  75
  76         wlc->ht_cap.cap_info &= ~IEEE80211_HT_CAP_RX_STBC;
  77         wlc->ht_cap.cap_info |= (val << IEEE80211_HT_CAP_RX_STBC_SHIFT);
  78
  79         if (wlc->pub->up) {
  80                 wlc_update_beacon(wlc);
  81                 wlc_update_probe_resp(wlc, true);
  82         }
  83 }
  84
  85 /* every WLC_TEMPSENSE_PERIOD seconds temperature check to decide whether to turn on/off txchain */
  86 void wlc_tempsense_upd(struct wlc_info *wlc)
  87 {
  88         wlc_phy_t *pi = wlc->band->pi;
  89         uint active_chains, txchain;
  90
  91         /* Check if the chip is too hot. Disable one Tx chain, if it is */
  92         /* high 4 bits are for Rx chain, low 4 bits are  for Tx chain */
  93         active_chains = wlc_phy_stf_chain_active_get(pi);
  94         txchain = active_chains & 0xf;
  95
  96         if (wlc->stf->txchain == wlc->stf->hw_txchain) {
  97                 if (txchain && (txchain < wlc->stf->hw_txchain)) {
  98                         /* turn off 1 tx chain */
  99                         wlc_stf_txchain_set(wlc, txchain, true);
 100                 }
 101         } else if (wlc->stf->txchain < wlc->stf->hw_txchain) {
 102                 if (txchain == wlc->stf->hw_txchain) {
 103                         /* turn back on txchain */
 104                         wlc_stf_txchain_set(wlc, txchain, true);
 105                 }
 106         }
 107 }
 108
 109 void
 110 wlc_stf_ss_algo_channel_get(struct wlc_info *wlc, u16 *ss_algo_channel,
 111                             chanspec_t chanspec)
 112 {
 113         tx_power_t power;
 114         u8 siso_mcs_id, cdd_mcs_id, stbc_mcs_id;
 115
 116         /* Clear previous settings */
 117         *ss_algo_channel = 0;
 118
 119         if (!wlc->pub->up) {
 120                 *ss_algo_channel = (u16) -1;
 121                 return;
 122         }
 123
 124         wlc_phy_txpower_get_current(wlc->band->pi, &power,
 125                                     CHSPEC_CHANNEL(chanspec));
 126
 127         siso_mcs_id = (CHSPEC_IS40(chanspec)) ?
 128             WL_TX_POWER_MCS40_SISO_FIRST : WL_TX_POWER_MCS20_SISO_FIRST;
 129         cdd_mcs_id = (CHSPEC_IS40(chanspec)) ?
 130             WL_TX_POWER_MCS40_CDD_FIRST : WL_TX_POWER_MCS20_CDD_FIRST;
 131         stbc_mcs_id = (CHSPEC_IS40(chanspec)) ?
 132             WL_TX_POWER_MCS40_STBC_FIRST : WL_TX_POWER_MCS20_STBC_FIRST;
 133
 134         /* criteria to choose stf mode */
 135
 136         /* the "+3dbm (12 0.25db units)" is to account for the fact that with CDD, tx occurs
 137          * on both chains
 138          */
 139         if (power.target[siso_mcs_id] > (power.target[cdd_mcs_id] + 12))
 140                 setbit(ss_algo_channel, PHY_TXC1_MODE_SISO);
 141         else
 142                 setbit(ss_algo_channel, PHY_TXC1_MODE_CDD);
 143
 144         /* STBC is ORed into to algo channel as STBC requires per-packet SCB capability check
 145          * so cannot be default mode of operation. One of SISO, CDD have to be set
 146          */
 147         if (power.target[siso_mcs_id] <= (power.target[stbc_mcs_id] + 12))
 148                 setbit(ss_algo_channel, PHY_TXC1_MODE_STBC);
 149 }
 150
 151 static bool wlc_stf_stbc_tx_set(struct wlc_info *wlc, s32 int_val)
 152 {
 153         if ((int_val != AUTO) && (int_val != OFF) && (int_val != ON)) {
 154                 return false;
 155         }
 156
 157         if ((int_val == ON) && (wlc->stf->txstreams == 1))
 158                 return false;
 159
 160         if ((int_val == OFF) || (wlc->stf->txstreams == 1)
 161             || !WLC_STBC_CAP_PHY(wlc))
 162                 wlc->ht_cap.cap_info &= ~IEEE80211_HT_CAP_TX_STBC;
 163         else
 164                 wlc->ht_cap.cap_info |= IEEE80211_HT_CAP_TX_STBC;
 165
 166         wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 167         wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 168
 169         return true;
 170 }
 171
 172 bool wlc_stf_stbc_rx_set(struct wlc_info *wlc, s32 int_val)
 173 {
 174         if ((int_val != HT_CAP_RX_STBC_NO)
 175             && (int_val != HT_CAP_RX_STBC_ONE_STREAM)) {
 176                 return false;
 177         }
 178
 179         if (WLC_STF_SS_STBC_RX(wlc)) {
 180                 if ((int_val != HT_CAP_RX_STBC_NO)
 181                     && (wlc->stf->rxstreams == 1))
 182                         return false;
 183         }
 184
 185         wlc_stf_stbc_rx_ht_update(wlc, int_val);
 186         return true;
 187 }
 188
 189 static int wlc_stf_txcore_set(struct wlc_info *wlc, u8 Nsts, u8 core_mask)
 190 {
 191         BCMMSG(wlc->wiphy, "wl%d: Nsts %d core_mask %x\n",
 192                  wlc->pub->unit, Nsts, core_mask);
 193
 194         if (WLC_BITSCNT(core_mask) > wlc->stf->txstreams) {
 195                 core_mask = 0;
 196         }
 197
 198         if ((WLC_BITSCNT(core_mask) == wlc->stf->txstreams) &&
 199             ((core_mask & ~wlc->stf->txchain)
 200              || !(core_mask & wlc->stf->txchain))) {
 201                 core_mask = wlc->stf->txchain;
 202         }
 203
 204         wlc->stf->txcore[Nsts] = core_mask;
 205         /* Nsts = 1..4, txcore index = 1..4 */
 206         if (Nsts == 1) {
 207                 /* Needs to update beacon and ucode generated response
 208                  * frames when 1 stream core map changed
 209                  */
 210                 wlc->stf->phytxant = core_mask << PHY_TXC_ANT_SHIFT;
 211                 wlc_bmac_txant_set(wlc->hw, wlc->stf->phytxant);
 212                 if (wlc->clk) {
 213                         wlc_suspend_mac_and_wait(wlc);
 214                         wlc_beacon_phytxctl_txant_upd(wlc, wlc->bcn_rspec);
 215                         wlc_enable_mac(wlc);
 216                 }
 217         }
 218
 219         return 0;
 220 }
 221
 222 static int wlc_stf_spatial_policy_set(struct wlc_info *wlc, int val)
 223 {
 224         int i;
 225         u8 core_mask = 0;
 226
 227         BCMMSG(wlc->wiphy, "wl%d: val %x\n", wlc->pub->unit, val);
 228
 229         wlc->stf->spatial_policy = (s8) val;
 230         for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++) {
 231                 core_mask = (val == MAX_SPATIAL_EXPANSION) ?
 232                     wlc->stf->txchain : txcore_default[i];
 233                 wlc_stf_txcore_set(wlc, (u8) i, core_mask);
 234         }
 235         return 0;
 236 }
 237
 238 int wlc_stf_txchain_set(struct wlc_info *wlc, s32 int_val, bool force)
 239 {
 240         u8 txchain = (u8) int_val;
 241         u8 txstreams;
 242         uint i;
 243
 244         if (wlc->stf->txchain == txchain)
 245                 return 0;
 246
 247         if ((txchain & ~wlc->stf->hw_txchain)
 248             || !(txchain & wlc->stf->hw_txchain))
 249                 return -EINVAL;
 250
 251         /* if nrate override is configured to be non-SISO STF mode, reject reducing txchain to 1 */
 252         txstreams = (u8) WLC_BITSCNT(txchain);
 253         if (txstreams > MAX_STREAMS_SUPPORTED)
 254                 return -EINVAL;
 255
 256         if (txstreams == 1) {
 257                 for (i = 0; i < NBANDS(wlc); i++)
 258                         if ((RSPEC_STF(wlc->bandstate[i]->rspec_override) !=
 259                              PHY_TXC1_MODE_SISO)
 260                             || (RSPEC_STF(wlc->bandstate[i]->mrspec_override) !=
 261                                 PHY_TXC1_MODE_SISO)) {
 262                                 if (!force)
 263                                         return -EBADE;
 264
 265                                 /* over-write the override rspec */
 266                                 if (RSPEC_STF(wlc->bandstate[i]->rspec_override)
 267                                     != PHY_TXC1_MODE_SISO) {
 268                                         wlc->bandstate[i]->rspec_override = 0;
 269                                         wiphy_err(wlc->wiphy, "%s(): temp "
 270                                                   "sense override non-SISO "
 271                                                   "rspec_override\n",
 272                                                   __func__);
 273                                 }
 274                                 if (RSPEC_STF
 275                                     (wlc->bandstate[i]->mrspec_override) !=
 276                                     PHY_TXC1_MODE_SISO) {
 277                                         wlc->bandstate[i]->mrspec_override = 0;
 278                                         wiphy_err(wlc->wiphy, "%s(): temp "
 279                                                   "sense override non-SISO "
 280                                                   "mrspec_override\n",
 281                                                   __func__);
 282                                 }
 283                         }
 284         }
 285
 286         wlc->stf->txchain = txchain;
 287         wlc->stf->txstreams = txstreams;
 288         wlc_stf_stbc_tx_set(wlc, wlc->band->band_stf_stbc_tx);
 289         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
 290         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
 291         wlc->stf->txant =
 292             (wlc->stf->txstreams == 1) ? ANT_TX_FORCE_0 : ANT_TX_DEF;
 293         _wlc_stf_phy_txant_upd(wlc);
 294
 295         wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain,
 296                               wlc->stf->rxchain);
 297
 298         for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++)
 299                 wlc_stf_txcore_set(wlc, (u8) i, txcore_default[i]);
 300
 301         return 0;
 302 }
 303
 304 /* update wlc->stf->ss_opmode which represents the operational stf_ss mode we're using */
 305 int wlc_stf_ss_update(struct wlc_info *wlc, struct wlcband *band)
 306 {
 307         int ret_code = 0;
 308         u8 prev_stf_ss;
 309         u8 upd_stf_ss;
 310
 311         prev_stf_ss = wlc->stf->ss_opmode;
 312
 313         /* NOTE: opmode can only be SISO or CDD as STBC is decided on a per-packet basis */
 314         if (WLC_STBC_CAP_PHY(wlc) &&
 315             wlc->stf->ss_algosel_auto
 316             && (wlc->stf->ss_algo_channel != (u16) -1)) {
 317                 upd_stf_ss = (wlc->stf->no_cddstbc || (wlc->stf->txstreams == 1)
 318                               || isset(&wlc->stf->ss_algo_channel,
 319                                        PHY_TXC1_MODE_SISO)) ? PHY_TXC1_MODE_SISO
 320                     : PHY_TXC1_MODE_CDD;
 321         } else {
 322                 if (wlc->band != band)
 323                         return ret_code;
 324                 upd_stf_ss = (wlc->stf->no_cddstbc
 325                               || (wlc->stf->txstreams ==
 326                                   1)) ? PHY_TXC1_MODE_SISO : band->
 327                     band_stf_ss_mode;
 328         }
 329         if (prev_stf_ss != upd_stf_ss) {
 330                 wlc->stf->ss_opmode = upd_stf_ss;
 331                 wlc_bmac_band_stf_ss_set(wlc->hw, upd_stf_ss);
 332         }
 333
 334         return ret_code;
 335 }
 336
 337 int wlc_stf_attach(struct wlc_info *wlc)
 338 {
 339         wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_SISO;
 340         wlc->bandstate[BAND_5G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_CDD;
 341
 342         if (WLCISNPHY(wlc->band) &&
 343             (wlc_phy_txpower_hw_ctrl_get(wlc->band->pi) != PHY_TPC_HW_ON))
 344                 wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode =
 345                     PHY_TXC1_MODE_CDD;
 346         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
 347         wlc_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
 348
 349         wlc_stf_stbc_rx_ht_update(wlc, HT_CAP_RX_STBC_NO);
 350         wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = OFF;
 351         wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = OFF;
 352
 353         if (WLC_STBC_CAP_PHY(wlc)) {
 354                 wlc->stf->ss_algosel_auto = true;
 355                 wlc->stf->ss_algo_channel = (u16) -1;   /* Init the default value */
 356         }
 357         return 0;
 358 }
 359
 360 void wlc_stf_detach(struct wlc_info *wlc)
 361 {
 362 }
 363
 364 /*
 365  * Centralized txant update function. call it whenever wlc->stf->txant and/or wlc->stf->txchain
 366  *  change
 367  *
 368  * Antennas are controlled by ucode indirectly, which drives PHY or GPIO to
 369  *   achieve various tx/rx antenna selection schemes
 370  *
 371  * legacy phy, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7 means auto(last rx)
 372  * for NREV<3, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7 means last rx and
 373  *    do tx-antenna selection for SISO transmissions
 374  * for NREV=3, bit 6 and bit _8_ means antenna 0 and 1 respectively, bit6+bit7 means last rx and
 375  *    do tx-antenna selection for SISO transmissions
 376  * for NREV>=7, bit 6 and bit 7 mean antenna 0 and 1 respectively, nit6+bit7 means both cores active
 377 */
 378 static void _wlc_stf_phy_txant_upd(struct wlc_info *wlc)
 379 {
 380         s8 txant;
 381
 382         txant = (s8) wlc->stf->txant;
 383         if (WLC_PHY_11N_CAP(wlc->band)) {
 384                 if (txant == ANT_TX_FORCE_0) {
 385                         wlc->stf->phytxant = PHY_TXC_ANT_0;
 386                 } else if (txant == ANT_TX_FORCE_1) {
 387                         wlc->stf->phytxant = PHY_TXC_ANT_1;
 388
 389                         if (WLCISNPHY(wlc->band) &&
 390                             NREV_GE(wlc->band->phyrev, 3)
 391                             && NREV_LT(wlc->band->phyrev, 7)) {
 392                                 wlc->stf->phytxant = PHY_TXC_ANT_2;
 393                         }
 394                 } else {
 395                         if (WLCISLCNPHY(wlc->band) || WLCISSSLPNPHY(wlc->band))
 396                                 wlc->stf->phytxant = PHY_TXC_LCNPHY_ANT_LAST;
 397                         else {
 398                                 /* catch out of sync wlc->stf->txcore */
 399                                 WARN_ON(wlc->stf->txchain <= 0);
 400                                 wlc->stf->phytxant =
 401                                     wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 402                         }
 403                 }
 404         } else {
 405                 if (txant == ANT_TX_FORCE_0)
 406                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_0;
 407                 else if (txant == ANT_TX_FORCE_1)
 408                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_1;
 409                 else
 410                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_LAST;
 411         }
 412
 413         wlc_bmac_txant_set(wlc->hw, wlc->stf->phytxant);
 414 }
 415
 416 void wlc_stf_phy_txant_upd(struct wlc_info *wlc)
 417 {
 418         _wlc_stf_phy_txant_upd(wlc);
 419 }
 420
 421 void wlc_stf_phy_chain_calc(struct wlc_info *wlc)
 422 {
 423         /* get available rx/tx chains */
 424         wlc->stf->hw_txchain = (u8) getintvar(wlc->pub->vars, "txchain");
 425         wlc->stf->hw_rxchain = (u8) getintvar(wlc->pub->vars, "rxchain");
 426
 427         /* these parameter are intended to be used for all PHY types */
 428         if (wlc->stf->hw_txchain == 0 || wlc->stf->hw_txchain == 0xf) {
 429                 if (WLCISNPHY(wlc->band)) {
 430                         wlc->stf->hw_txchain = TXCHAIN_DEF_NPHY;
 431                 } else {
 432                         wlc->stf->hw_txchain = TXCHAIN_DEF;
 433                 }
 434         }
 435
 436         wlc->stf->txchain = wlc->stf->hw_txchain;
 437         wlc->stf->txstreams = (u8) WLC_BITSCNT(wlc->stf->hw_txchain);
 438
 439         if (wlc->stf->hw_rxchain == 0 || wlc->stf->hw_rxchain == 0xf) {
 440                 if (WLCISNPHY(wlc->band)) {
 441                         wlc->stf->hw_rxchain = RXCHAIN_DEF_NPHY;
 442                 } else {
 443                         wlc->stf->hw_rxchain = RXCHAIN_DEF;
 444                 }
 445         }
 446
 447         wlc->stf->rxchain = wlc->stf->hw_rxchain;
 448         wlc->stf->rxstreams = (u8) WLC_BITSCNT(wlc->stf->hw_rxchain);
 449
 450         /* initialize the txcore table */
 451         memcpy(wlc->stf->txcore, txcore_default, sizeof(wlc->stf->txcore));
 452
 453         /* default spatial_policy */
 454         wlc->stf->spatial_policy = MIN_SPATIAL_EXPANSION;
 455         wlc_stf_spatial_policy_set(wlc, MIN_SPATIAL_EXPANSION);
 456 }
 457
 458 static u16 _wlc_stf_phytxchain_sel(struct wlc_info *wlc, ratespec_t rspec)
 459 {
 460         u16 phytxant = wlc->stf->phytxant;
 461
 462         if (RSPEC_STF(rspec) != PHY_TXC1_MODE_SISO) {
 463                 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 464         } else if (wlc->stf->txant == ANT_TX_DEF)
 465                 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 466         phytxant &= PHY_TXC_ANT_MASK;
 467         return phytxant;
 468 }
 469
 470 u16 wlc_stf_phytxchain_sel(struct wlc_info *wlc, ratespec_t rspec)
 471 {
 472         return _wlc_stf_phytxchain_sel(wlc, rspec);
 473 }
 474
 475 u16 wlc_stf_d11hdrs_phyctl_txant(struct wlc_info *wlc, ratespec_t rspec)
 476 {
 477         u16 phytxant = wlc->stf->phytxant;
 478         u16 mask = PHY_TXC_ANT_MASK;
 479
 480         /* for non-siso rates or default setting, use the available chains */
 481         if (WLCISNPHY(wlc->band)) {
 482                 phytxant = _wlc_stf_phytxchain_sel(wlc, rspec);
 483                 mask = PHY_TXC_HTANT_MASK;
 484         }
 485         phytxant |= phytxant & mask;
 486         return phytxant;
 487 }