drivers/net/wireless/brcm80211/brcmsmac/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 <net/mac80211.h>
  18
  19 #include "types.h"
  20 #include "d11.h"
  21 #include "rate.h"
  22 #include "phy/phy_hal.h"
  23 #include "channel.h"
  24 #include "main.h"
  25 #include "stf.h"
  26
  27 #define MIN_SPATIAL_EXPANSION   0
  28 #define MAX_SPATIAL_EXPANSION   1
  29
  30 #define BRCMS_STF_SS_STBC_RX(wlc) (BRCMS_ISNPHY(wlc->band) && \
  31         NREV_GT(wlc->band->phyrev, 3) && NREV_LE(wlc->band->phyrev, 6))
  32
  33 #define NSTS_1  1
  34 #define NSTS_2  2
  35 #define NSTS_3  3
  36 #define NSTS_4  4
  37
  38 static const u8 txcore_default[5] = {
  39         (0),                    /* bitmap of the core enabled */
  40         (0x01),                 /* For Nsts = 1, enable core 1 */
  41         (0x03),                 /* For Nsts = 2, enable core 1 & 2 */
  42         (0x07),                 /* For Nsts = 3, enable core 1, 2 & 3 */
  43         (0x0f)                  /* For Nsts = 4, enable all cores */
  44 };
  45
  46 static void brcms_c_stf_stbc_rx_ht_update(struct brcms_c_info *wlc, int val)
  47 {
  48         /* MIMOPHYs rev3-6 cannot receive STBC with only one rx core active */
  49         if (BRCMS_STF_SS_STBC_RX(wlc)) {
  50                 if ((wlc->stf->rxstreams == 1) && (val != HT_CAP_RX_STBC_NO))
  51                         return;
  52         }
  53
  54         if (wlc->pub->up) {
  55                 brcms_c_update_beacon(wlc);
  56                 brcms_c_update_probe_resp(wlc, true);
  57         }
  58 }
  59
  60 /*
  61  * every WLC_TEMPSENSE_PERIOD seconds temperature check to decide whether to
  62  * turn on/off txchain.
  63  */
  64 void brcms_c_tempsense_upd(struct brcms_c_info *wlc)
  65 {
  66         struct brcms_phy_pub *pi = wlc->band->pi;
  67         uint active_chains, txchain;
  68
  69         /* Check if the chip is too hot. Disable one Tx chain, if it is */
  70         /* high 4 bits are for Rx chain, low 4 bits are  for Tx chain */
  71         active_chains = wlc_phy_stf_chain_active_get(pi);
  72         txchain = active_chains & 0xf;
  73
  74         if (wlc->stf->txchain == wlc->stf->hw_txchain) {
  75                 if (txchain && (txchain < wlc->stf->hw_txchain))
  76                         /* turn off 1 tx chain */
  77                         brcms_c_stf_txchain_set(wlc, txchain, true);
  78         } else if (wlc->stf->txchain < wlc->stf->hw_txchain) {
  79                 if (txchain == wlc->stf->hw_txchain)
  80                         /* turn back on txchain */
  81                         brcms_c_stf_txchain_set(wlc, txchain, true);
  82         }
  83 }
  84
  85 void
  86 brcms_c_stf_ss_algo_channel_get(struct brcms_c_info *wlc, u16 *ss_algo_channel,
  87                             u16 chanspec)
  88 {
  89         struct tx_power power;
  90         u8 siso_mcs_id, cdd_mcs_id, stbc_mcs_id;
  91
  92         /* Clear previous settings */
  93         *ss_algo_channel = 0;
  94
  95         if (!wlc->pub->up) {
  96                 *ss_algo_channel = (u16) -1;
  97                 return;
  98         }
  99
 100         wlc_phy_txpower_get_current(wlc->band->pi, &power,
 101                                     CHSPEC_CHANNEL(chanspec));
 102
 103         siso_mcs_id = (CHSPEC_IS40(chanspec)) ?
 104             WL_TX_POWER_MCS40_SISO_FIRST : WL_TX_POWER_MCS20_SISO_FIRST;
 105         cdd_mcs_id = (CHSPEC_IS40(chanspec)) ?
 106             WL_TX_POWER_MCS40_CDD_FIRST : WL_TX_POWER_MCS20_CDD_FIRST;
 107         stbc_mcs_id = (CHSPEC_IS40(chanspec)) ?
 108             WL_TX_POWER_MCS40_STBC_FIRST : WL_TX_POWER_MCS20_STBC_FIRST;
 109
 110         /* criteria to choose stf mode */
 111
 112         /*
 113          * the "+3dbm (12 0.25db units)" is to account for the fact that with
 114          * CDD, tx occurs on both chains
 115          */
 116         if (power.target[siso_mcs_id] > (power.target[cdd_mcs_id] + 12))
 117                 setbit(ss_algo_channel, PHY_TXC1_MODE_SISO);
 118         else
 119                 setbit(ss_algo_channel, PHY_TXC1_MODE_CDD);
 120
 121         /*
 122          * STBC is ORed into to algo channel as STBC requires per-packet SCB
 123          * capability check so cannot be default mode of operation. One of
 124          * SISO, CDD have to be set
 125          */
 126         if (power.target[siso_mcs_id] <= (power.target[stbc_mcs_id] + 12))
 127                 setbit(ss_algo_channel, PHY_TXC1_MODE_STBC);
 128 }
 129
 130 static bool brcms_c_stf_stbc_tx_set(struct brcms_c_info *wlc, s32 int_val)
 131 {
 132         if ((int_val != AUTO) && (int_val != OFF) && (int_val != ON))
 133                 return false;
 134
 135         if ((int_val == ON) && (wlc->stf->txstreams == 1))
 136                 return false;
 137
 138         wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 139         wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 140
 141         return true;
 142 }
 143
 144 bool brcms_c_stf_stbc_rx_set(struct brcms_c_info *wlc, s32 int_val)
 145 {
 146         if ((int_val != HT_CAP_RX_STBC_NO)
 147             && (int_val != HT_CAP_RX_STBC_ONE_STREAM))
 148                 return false;
 149
 150         if (BRCMS_STF_SS_STBC_RX(wlc)) {
 151                 if ((int_val != HT_CAP_RX_STBC_NO)
 152                     && (wlc->stf->rxstreams == 1))
 153                         return false;
 154         }
 155
 156         brcms_c_stf_stbc_rx_ht_update(wlc, int_val);
 157         return true;
 158 }
 159
 160 static int brcms_c_stf_txcore_set(struct brcms_c_info *wlc, u8 Nsts,
 161                                   u8 core_mask)
 162 {
 163         BCMMSG(wlc->wiphy, "wl%d: Nsts %d core_mask %x\n",
 164                  wlc->pub->unit, Nsts, core_mask);
 165
 166         if (hweight8(core_mask) > wlc->stf->txstreams)
 167                 core_mask = 0;
 168
 169         if ((hweight8(core_mask) == wlc->stf->txstreams) &&
 170             ((core_mask & ~wlc->stf->txchain)
 171              || !(core_mask & wlc->stf->txchain)))
 172                 core_mask = wlc->stf->txchain;
 173
 174         wlc->stf->txcore[Nsts] = core_mask;
 175         /* Nsts = 1..4, txcore index = 1..4 */
 176         if (Nsts == 1) {
 177                 /* Needs to update beacon and ucode generated response
 178                  * frames when 1 stream core map changed
 179                  */
 180                 wlc->stf->phytxant = core_mask << PHY_TXC_ANT_SHIFT;
 181                 brcms_b_txant_set(wlc->hw, wlc->stf->phytxant);
 182                 if (wlc->clk) {
 183                         brcms_c_suspend_mac_and_wait(wlc);
 184                         brcms_c_beacon_phytxctl_txant_upd(wlc, wlc->bcn_rspec);
 185                         brcms_c_enable_mac(wlc);
 186                 }
 187         }
 188
 189         return 0;
 190 }
 191
 192 static int brcms_c_stf_spatial_policy_set(struct brcms_c_info *wlc, int val)
 193 {
 194         int i;
 195         u8 core_mask = 0;
 196
 197         BCMMSG(wlc->wiphy, "wl%d: val %x\n", wlc->pub->unit, val);
 198
 199         wlc->stf->spatial_policy = (s8) val;
 200         for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++) {
 201                 core_mask = (val == MAX_SPATIAL_EXPANSION) ?
 202                     wlc->stf->txchain : txcore_default[i];
 203                 brcms_c_stf_txcore_set(wlc, (u8) i, core_mask);
 204         }
 205         return 0;
 206 }
 207
 208 /*
 209  * Centralized txant update function. call it whenever wlc->stf->txant and/or
 210  * wlc->stf->txchain change.
 211  *
 212  * Antennas are controlled by ucode indirectly, which drives PHY or GPIO to
 213  * achieve various tx/rx antenna selection schemes
 214  *
 215  * legacy phy, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7
 216  * means auto(last rx).
 217  * for NREV<3, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7
 218  * means last rx and do tx-antenna selection for SISO transmissions
 219  * for NREV=3, bit 6 and bit _8_ means antenna 0 and 1 respectively, bit6+bit7
 220  * means last rx and do tx-antenna selection for SISO transmissions
 221  * for NREV>=7, bit 6 and bit 7 mean antenna 0 and 1 respectively, nit6+bit7
 222  * means both cores active
 223 */
 224 static void _brcms_c_stf_phy_txant_upd(struct brcms_c_info *wlc)
 225 {
 226         s8 txant;
 227
 228         txant = (s8) wlc->stf->txant;
 229         if (BRCMS_PHY_11N_CAP(wlc->band)) {
 230                 if (txant == ANT_TX_FORCE_0) {
 231                         wlc->stf->phytxant = PHY_TXC_ANT_0;
 232                 } else if (txant == ANT_TX_FORCE_1) {
 233                         wlc->stf->phytxant = PHY_TXC_ANT_1;
 234
 235                         if (BRCMS_ISNPHY(wlc->band) &&
 236                             NREV_GE(wlc->band->phyrev, 3)
 237                             && NREV_LT(wlc->band->phyrev, 7))
 238                                 wlc->stf->phytxant = PHY_TXC_ANT_2;
 239                 } else {
 240                         if (BRCMS_ISLCNPHY(wlc->band) ||
 241                             BRCMS_ISSSLPNPHY(wlc->band))
 242                                 wlc->stf->phytxant = PHY_TXC_LCNPHY_ANT_LAST;
 243                         else {
 244                                 /* catch out of sync wlc->stf->txcore */
 245                                 WARN_ON(wlc->stf->txchain <= 0);
 246                                 wlc->stf->phytxant =
 247                                     wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 248                         }
 249                 }
 250         } else {
 251                 if (txant == ANT_TX_FORCE_0)
 252                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_0;
 253                 else if (txant == ANT_TX_FORCE_1)
 254                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_1;
 255                 else
 256                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_LAST;
 257         }
 258
 259         brcms_b_txant_set(wlc->hw, wlc->stf->phytxant);
 260 }
 261
 262 int brcms_c_stf_txchain_set(struct brcms_c_info *wlc, s32 int_val, bool force)
 263 {
 264         u8 txchain = (u8) int_val;
 265         u8 txstreams;
 266         uint i;
 267
 268         if (wlc->stf->txchain == txchain)
 269                 return 0;
 270
 271         if ((txchain & ~wlc->stf->hw_txchain)
 272             || !(txchain & wlc->stf->hw_txchain))
 273                 return -EINVAL;
 274
 275         /*
 276          * if nrate override is configured to be non-SISO STF mode, reject
 277          * reducing txchain to 1
 278          */
 279         txstreams = (u8) hweight8(txchain);
 280         if (txstreams > MAX_STREAMS_SUPPORTED)
 281                 return -EINVAL;
 282
 283         wlc->stf->txchain = txchain;
 284         wlc->stf->txstreams = txstreams;
 285         brcms_c_stf_stbc_tx_set(wlc, wlc->band->band_stf_stbc_tx);
 286         brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
 287         brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
 288         wlc->stf->txant =
 289             (wlc->stf->txstreams == 1) ? ANT_TX_FORCE_0 : ANT_TX_DEF;
 290         _brcms_c_stf_phy_txant_upd(wlc);
 291
 292         wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain,
 293                               wlc->stf->rxchain);
 294
 295         for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++)
 296                 brcms_c_stf_txcore_set(wlc, (u8) i, txcore_default[i]);
 297
 298         return 0;
 299 }
 300
 301 /*
 302  * update wlc->stf->ss_opmode which represents the operational stf_ss mode
 303  * we're using
 304  */
 305 int brcms_c_stf_ss_update(struct brcms_c_info *wlc, struct brcms_band *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         /*
 314          * NOTE: opmode can only be SISO or CDD as STBC is decided on a
 315          * per-packet basis
 316          */
 317         if (BRCMS_STBC_CAP_PHY(wlc) &&
 318             wlc->stf->ss_algosel_auto
 319             && (wlc->stf->ss_algo_channel != (u16) -1)) {
 320                 upd_stf_ss = (wlc->stf->txstreams == 1 ||
 321                               isset(&wlc->stf->ss_algo_channel,
 322                                     PHY_TXC1_MODE_SISO)) ?
 323                                     PHY_TXC1_MODE_SISO : PHY_TXC1_MODE_CDD;
 324         } else {
 325                 if (wlc->band != band)
 326                         return ret_code;
 327                 upd_stf_ss = (wlc->stf->txstreams == 1) ?
 328                                 PHY_TXC1_MODE_SISO : band->band_stf_ss_mode;
 329         }
 330         if (prev_stf_ss != upd_stf_ss) {
 331                 wlc->stf->ss_opmode = upd_stf_ss;
 332                 brcms_b_band_stf_ss_set(wlc->hw, upd_stf_ss);
 333         }
 334
 335         return ret_code;
 336 }
 337
 338 int brcms_c_stf_attach(struct brcms_c_info *wlc)
 339 {
 340         wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_SISO;
 341         wlc->bandstate[BAND_5G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_CDD;
 342
 343         if (BRCMS_ISNPHY(wlc->band) &&
 344             (wlc_phy_txpower_hw_ctrl_get(wlc->band->pi) != PHY_TPC_HW_ON))
 345                 wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode =
 346                     PHY_TXC1_MODE_CDD;
 347         brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
 348         brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
 349
 350         brcms_c_stf_stbc_rx_ht_update(wlc, HT_CAP_RX_STBC_NO);
 351         wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = OFF;
 352         wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = OFF;
 353
 354         if (BRCMS_STBC_CAP_PHY(wlc)) {
 355                 wlc->stf->ss_algosel_auto = true;
 356                 /* Init the default value */
 357                 wlc->stf->ss_algo_channel = (u16) -1;
 358         }
 359         return 0;
 360 }
 361
 362 void brcms_c_stf_detach(struct brcms_c_info *wlc)
 363 {
 364 }
 365
 366 void brcms_c_stf_phy_txant_upd(struct brcms_c_info *wlc)
 367 {
 368         _brcms_c_stf_phy_txant_upd(wlc);
 369 }
 370
 371 void brcms_c_stf_phy_chain_calc(struct brcms_c_info *wlc)
 372 {
 373         /* get available rx/tx chains */
 374         wlc->stf->hw_txchain = (u8) getintvar(wlc->hw->sih, BRCMS_SROM_TXCHAIN);
 375         wlc->stf->hw_rxchain = (u8) getintvar(wlc->hw->sih, BRCMS_SROM_RXCHAIN);
 376
 377         /* these parameter are intended to be used for all PHY types */
 378         if (wlc->stf->hw_txchain == 0 || wlc->stf->hw_txchain == 0xf) {
 379                 if (BRCMS_ISNPHY(wlc->band))
 380                         wlc->stf->hw_txchain = TXCHAIN_DEF_NPHY;
 381                 else
 382                         wlc->stf->hw_txchain = TXCHAIN_DEF;
 383         }
 384
 385         wlc->stf->txchain = wlc->stf->hw_txchain;
 386         wlc->stf->txstreams = (u8) hweight8(wlc->stf->hw_txchain);
 387
 388         if (wlc->stf->hw_rxchain == 0 || wlc->stf->hw_rxchain == 0xf) {
 389                 if (BRCMS_ISNPHY(wlc->band))
 390                         wlc->stf->hw_rxchain = RXCHAIN_DEF_NPHY;
 391                 else
 392                         wlc->stf->hw_rxchain = RXCHAIN_DEF;
 393         }
 394
 395         wlc->stf->rxchain = wlc->stf->hw_rxchain;
 396         wlc->stf->rxstreams = (u8) hweight8(wlc->stf->hw_rxchain);
 397
 398         /* initialize the txcore table */
 399         memcpy(wlc->stf->txcore, txcore_default, sizeof(wlc->stf->txcore));
 400
 401         /* default spatial_policy */
 402         wlc->stf->spatial_policy = MIN_SPATIAL_EXPANSION;
 403         brcms_c_stf_spatial_policy_set(wlc, MIN_SPATIAL_EXPANSION);
 404 }
 405
 406 static u16 _brcms_c_stf_phytxchain_sel(struct brcms_c_info *wlc,
 407                                        u32 rspec)
 408 {
 409         u16 phytxant = wlc->stf->phytxant;
 410
 411         if (rspec_stf(rspec) != PHY_TXC1_MODE_SISO)
 412                 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 413         else if (wlc->stf->txant == ANT_TX_DEF)
 414                 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 415         phytxant &= PHY_TXC_ANT_MASK;
 416         return phytxant;
 417 }
 418
 419 u16 brcms_c_stf_phytxchain_sel(struct brcms_c_info *wlc, u32 rspec)
 420 {
 421         return _brcms_c_stf_phytxchain_sel(wlc, rspec);
 422 }
 423
 424 u16 brcms_c_stf_d11hdrs_phyctl_txant(struct brcms_c_info *wlc, u32 rspec)
 425 {
 426         u16 phytxant = wlc->stf->phytxant;
 427         u16 mask = PHY_TXC_ANT_MASK;
 428
 429         /* for non-siso rates or default setting, use the available chains */
 430         if (BRCMS_ISNPHY(wlc->band)) {
 431                 phytxant = _brcms_c_stf_phytxchain_sel(wlc, rspec);
 432                 mask = PHY_TXC_HTANT_MASK;
 433         }
 434         phytxant |= phytxant & mask;
 435         return phytxant;
 436 }