drivers/staging/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 BRCMS_BITSCNT(x)        brcmu_bitcount((u8 *)&(x), sizeof(u8))
  34
  35 #define NSTS_1  1
  36 #define NSTS_2  2
  37 #define NSTS_3  3
  38 #define NSTS_4  4
  39
  40 static const u8 txcore_default[5] = {
  41         (0),                    /* bitmap of the core enabled */
  42         (0x01),                 /* For Nsts = 1, enable core 1 */
  43         (0x03),                 /* For Nsts = 2, enable core 1 & 2 */
  44         (0x07),                 /* For Nsts = 3, enable core 1, 2 & 3 */
  45         (0x0f)                  /* For Nsts = 4, enable all cores */
  46 };
  47
  48 static void brcms_c_stf_stbc_rx_ht_update(struct brcms_c_info *wlc, int val)
  49 {
  50         /* MIMOPHYs rev3-6 cannot receive STBC with only one rx core active */
  51         if (BRCMS_STF_SS_STBC_RX(wlc)) {
  52                 if ((wlc->stf->rxstreams == 1) && (val != HT_CAP_RX_STBC_NO))
  53                         return;
  54         }
  55
  56         if (wlc->pub->up) {
  57                 brcms_c_update_beacon(wlc);
  58                 brcms_c_update_probe_resp(wlc, true);
  59         }
  60 }
  61
  62 /*
  63  * every WLC_TEMPSENSE_PERIOD seconds temperature check to decide whether to
  64  * turn on/off txchain.
  65  */
  66 void brcms_c_tempsense_upd(struct brcms_c_info *wlc)
  67 {
  68         struct brcms_phy_pub *pi = wlc->band->pi;
  69         uint active_chains, txchain;
  70
  71         /* Check if the chip is too hot. Disable one Tx chain, if it is */
  72         /* high 4 bits are for Rx chain, low 4 bits are  for Tx chain */
  73         active_chains = wlc_phy_stf_chain_active_get(pi);
  74         txchain = active_chains & 0xf;
  75
  76         if (wlc->stf->txchain == wlc->stf->hw_txchain) {
  77                 if (txchain && (txchain < wlc->stf->hw_txchain))
  78                         /* turn off 1 tx chain */
  79                         brcms_c_stf_txchain_set(wlc, txchain, true);
  80         } else if (wlc->stf->txchain < wlc->stf->hw_txchain) {
  81                 if (txchain == wlc->stf->hw_txchain)
  82                         /* turn back on txchain */
  83                         brcms_c_stf_txchain_set(wlc, txchain, true);
  84         }
  85 }
  86
  87 void
  88 brcms_c_stf_ss_algo_channel_get(struct brcms_c_info *wlc, u16 *ss_algo_channel,
  89                             u16 chanspec)
  90 {
  91         struct tx_power power;
  92         u8 siso_mcs_id, cdd_mcs_id, stbc_mcs_id;
  93
  94         /* Clear previous settings */
  95         *ss_algo_channel = 0;
  96
  97         if (!wlc->pub->up) {
  98                 *ss_algo_channel = (u16) -1;
  99                 return;
 100         }
 101
 102         wlc_phy_txpower_get_current(wlc->band->pi, &power,
 103                                     CHSPEC_CHANNEL(chanspec));
 104
 105         siso_mcs_id = (CHSPEC_IS40(chanspec)) ?
 106             WL_TX_POWER_MCS40_SISO_FIRST : WL_TX_POWER_MCS20_SISO_FIRST;
 107         cdd_mcs_id = (CHSPEC_IS40(chanspec)) ?
 108             WL_TX_POWER_MCS40_CDD_FIRST : WL_TX_POWER_MCS20_CDD_FIRST;
 109         stbc_mcs_id = (CHSPEC_IS40(chanspec)) ?
 110             WL_TX_POWER_MCS40_STBC_FIRST : WL_TX_POWER_MCS20_STBC_FIRST;
 111
 112         /* criteria to choose stf mode */
 113
 114         /*
 115          * the "+3dbm (12 0.25db units)" is to account for the fact that with
 116          * CDD, tx occurs on both chains
 117          */
 118         if (power.target[siso_mcs_id] > (power.target[cdd_mcs_id] + 12))
 119                 setbit(ss_algo_channel, PHY_TXC1_MODE_SISO);
 120         else
 121                 setbit(ss_algo_channel, PHY_TXC1_MODE_CDD);
 122
 123         /*
 124          * STBC is ORed into to algo channel as STBC requires per-packet SCB
 125          * capability check so cannot be default mode of operation. One of
 126          * SISO, CDD have to be set
 127          */
 128         if (power.target[siso_mcs_id] <= (power.target[stbc_mcs_id] + 12))
 129                 setbit(ss_algo_channel, PHY_TXC1_MODE_STBC);
 130 }
 131
 132 static bool brcms_c_stf_stbc_tx_set(struct brcms_c_info *wlc, s32 int_val)
 133 {
 134         if ((int_val != AUTO) && (int_val != OFF) && (int_val != ON))
 135                 return false;
 136
 137         if ((int_val == ON) && (wlc->stf->txstreams == 1))
 138                 return false;
 139
 140         wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 141         wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 142
 143         return true;
 144 }
 145
 146 bool brcms_c_stf_stbc_rx_set(struct brcms_c_info *wlc, s32 int_val)
 147 {
 148         if ((int_val != HT_CAP_RX_STBC_NO)
 149             && (int_val != HT_CAP_RX_STBC_ONE_STREAM))
 150                 return false;
 151
 152         if (BRCMS_STF_SS_STBC_RX(wlc)) {
 153                 if ((int_val != HT_CAP_RX_STBC_NO)
 154                     && (wlc->stf->rxstreams == 1))
 155                         return false;
 156         }
 157
 158         brcms_c_stf_stbc_rx_ht_update(wlc, int_val);
 159         return true;
 160 }
 161
 162 static int brcms_c_stf_txcore_set(struct brcms_c_info *wlc, u8 Nsts,
 163                                   u8 core_mask)
 164 {
 165         BCMMSG(wlc->wiphy, "wl%d: Nsts %d core_mask %x\n",
 166                  wlc->pub->unit, Nsts, core_mask);
 167
 168         if (hweight8(core_mask) > wlc->stf->txstreams)
 169                 core_mask = 0;
 170
 171         if ((hweight8(core_mask) == wlc->stf->txstreams) &&
 172             ((core_mask & ~wlc->stf->txchain)
 173              || !(core_mask & wlc->stf->txchain)))
 174                 core_mask = wlc->stf->txchain;
 175
 176         wlc->stf->txcore[Nsts] = core_mask;
 177         /* Nsts = 1..4, txcore index = 1..4 */
 178         if (Nsts == 1) {
 179                 /* Needs to update beacon and ucode generated response
 180                  * frames when 1 stream core map changed
 181                  */
 182                 wlc->stf->phytxant = core_mask << PHY_TXC_ANT_SHIFT;
 183                 brcms_b_txant_set(wlc->hw, wlc->stf->phytxant);
 184                 if (wlc->clk) {
 185                         brcms_c_suspend_mac_and_wait(wlc);
 186                         brcms_c_beacon_phytxctl_txant_upd(wlc, wlc->bcn_rspec);
 187                         brcms_c_enable_mac(wlc);
 188                 }
 189         }
 190
 191         return 0;
 192 }
 193
 194 static int brcms_c_stf_spatial_policy_set(struct brcms_c_info *wlc, int val)
 195 {
 196         int i;
 197         u8 core_mask = 0;
 198
 199         BCMMSG(wlc->wiphy, "wl%d: val %x\n", wlc->pub->unit, val);
 200
 201         wlc->stf->spatial_policy = (s8) val;
 202         for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++) {
 203                 core_mask = (val == MAX_SPATIAL_EXPANSION) ?
 204                     wlc->stf->txchain : txcore_default[i];
 205                 brcms_c_stf_txcore_set(wlc, (u8) i, core_mask);
 206         }
 207         return 0;
 208 }
 209
 210 /*
 211  * Centralized txant update function. call it whenever wlc->stf->txant and/or
 212  * wlc->stf->txchain change.
 213  *
 214  * Antennas are controlled by ucode indirectly, which drives PHY or GPIO to
 215  * achieve various tx/rx antenna selection schemes
 216  *
 217  * legacy phy, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7
 218  * means auto(last rx).
 219  * for NREV<3, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7
 220  * means last rx and do tx-antenna selection for SISO transmissions
 221  * for NREV=3, bit 6 and bit _8_ means antenna 0 and 1 respectively, bit6+bit7
 222  * means last rx and do tx-antenna selection for SISO transmissions
 223  * for NREV>=7, bit 6 and bit 7 mean antenna 0 and 1 respectively, nit6+bit7
 224  * means both cores active
 225 */
 226 static void _brcms_c_stf_phy_txant_upd(struct brcms_c_info *wlc)
 227 {
 228         s8 txant;
 229
 230         txant = (s8) wlc->stf->txant;
 231         if (BRCMS_PHY_11N_CAP(wlc->band)) {
 232                 if (txant == ANT_TX_FORCE_0) {
 233                         wlc->stf->phytxant = PHY_TXC_ANT_0;
 234                 } else if (txant == ANT_TX_FORCE_1) {
 235                         wlc->stf->phytxant = PHY_TXC_ANT_1;
 236
 237                         if (BRCMS_ISNPHY(wlc->band) &&
 238                             NREV_GE(wlc->band->phyrev, 3)
 239                             && NREV_LT(wlc->band->phyrev, 7))
 240                                 wlc->stf->phytxant = PHY_TXC_ANT_2;
 241                 } else {
 242                         if (BRCMS_ISLCNPHY(wlc->band) ||
 243                             BRCMS_ISSSLPNPHY(wlc->band))
 244                                 wlc->stf->phytxant = PHY_TXC_LCNPHY_ANT_LAST;
 245                         else {
 246                                 /* catch out of sync wlc->stf->txcore */
 247                                 WARN_ON(wlc->stf->txchain <= 0);
 248                                 wlc->stf->phytxant =
 249                                     wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 250                         }
 251                 }
 252         } else {
 253                 if (txant == ANT_TX_FORCE_0)
 254                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_0;
 255                 else if (txant == ANT_TX_FORCE_1)
 256                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_1;
 257                 else
 258                         wlc->stf->phytxant = PHY_TXC_OLD_ANT_LAST;
 259         }
 260
 261         brcms_b_txant_set(wlc->hw, wlc->stf->phytxant);
 262 }
 263
 264 int brcms_c_stf_txchain_set(struct brcms_c_info *wlc, s32 int_val, bool force)
 265 {
 266         u8 txchain = (u8) int_val;
 267         u8 txstreams;
 268         uint i;
 269
 270         if (wlc->stf->txchain == txchain)
 271                 return 0;
 272
 273         if ((txchain & ~wlc->stf->hw_txchain)
 274             || !(txchain & wlc->stf->hw_txchain))
 275                 return -EINVAL;
 276
 277         /*
 278          * if nrate override is configured to be non-SISO STF mode, reject
 279          * reducing txchain to 1
 280          */
 281         txstreams = (u8) hweight8(txchain);
 282         if (txstreams > MAX_STREAMS_SUPPORTED)
 283                 return -EINVAL;
 284
 285         wlc->stf->txchain = txchain;
 286         wlc->stf->txstreams = txstreams;
 287         brcms_c_stf_stbc_tx_set(wlc, wlc->band->band_stf_stbc_tx);
 288         brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
 289         brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
 290         wlc->stf->txant =
 291             (wlc->stf->txstreams == 1) ? ANT_TX_FORCE_0 : ANT_TX_DEF;
 292         _brcms_c_stf_phy_txant_upd(wlc);
 293
 294         wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain,
 295                               wlc->stf->rxchain);
 296
 297         for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++)
 298                 brcms_c_stf_txcore_set(wlc, (u8) i, txcore_default[i]);
 299
 300         return 0;
 301 }
 302
 303 /*
 304  * update wlc->stf->ss_opmode which represents the operational stf_ss mode
 305  * we're using
 306  */
 307 int brcms_c_stf_ss_update(struct brcms_c_info *wlc, struct brcms_band *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         /*
 316          * NOTE: opmode can only be SISO or CDD as STBC is decided on a
 317          * per-packet basis
 318          */
 319         if (BRCMS_STBC_CAP_PHY(wlc) &&
 320             wlc->stf->ss_algosel_auto
 321             && (wlc->stf->ss_algo_channel != (u16) -1)) {
 322                 upd_stf_ss = (wlc->stf->txstreams == 1 ||
 323                               isset(&wlc->stf->ss_algo_channel,
 324                                     PHY_TXC1_MODE_SISO)) ?
 325                                     PHY_TXC1_MODE_SISO : PHY_TXC1_MODE_CDD;
 326         } else {
 327                 if (wlc->band != band)
 328                         return ret_code;
 329                 upd_stf_ss = (wlc->stf->txstreams == 1) ?
 330                                 PHY_TXC1_MODE_SISO : band->band_stf_ss_mode;
 331         }
 332         if (prev_stf_ss != upd_stf_ss) {
 333                 wlc->stf->ss_opmode = upd_stf_ss;
 334                 brcms_b_band_stf_ss_set(wlc->hw, upd_stf_ss);
 335         }
 336
 337         return ret_code;
 338 }
 339
 340 int brcms_c_stf_attach(struct brcms_c_info *wlc)
 341 {
 342         wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_SISO;
 343         wlc->bandstate[BAND_5G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_CDD;
 344
 345         if (BRCMS_ISNPHY(wlc->band) &&
 346             (wlc_phy_txpower_hw_ctrl_get(wlc->band->pi) != PHY_TPC_HW_ON))
 347                 wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode =
 348                     PHY_TXC1_MODE_CDD;
 349         brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
 350         brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
 351
 352         brcms_c_stf_stbc_rx_ht_update(wlc, HT_CAP_RX_STBC_NO);
 353         wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = OFF;
 354         wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = OFF;
 355
 356         if (BRCMS_STBC_CAP_PHY(wlc)) {
 357                 wlc->stf->ss_algosel_auto = true;
 358                 /* Init the default value */
 359                 wlc->stf->ss_algo_channel = (u16) -1;
 360         }
 361         return 0;
 362 }
 363
 364 void brcms_c_stf_detach(struct brcms_c_info *wlc)
 365 {
 366 }
 367
 368 void brcms_c_stf_phy_txant_upd(struct brcms_c_info *wlc)
 369 {
 370         _brcms_c_stf_phy_txant_upd(wlc);
 371 }
 372
 373 void brcms_c_stf_phy_chain_calc(struct brcms_c_info *wlc)
 374 {
 375         /* get available rx/tx chains */
 376         wlc->stf->hw_txchain = (u8) getintvar(wlc->hw->sih, "txchain");
 377         wlc->stf->hw_rxchain = (u8) getintvar(wlc->hw->sih, "rxchain");
 378
 379         /* these parameter are intended to be used for all PHY types */
 380         if (wlc->stf->hw_txchain == 0 || wlc->stf->hw_txchain == 0xf) {
 381                 if (BRCMS_ISNPHY(wlc->band))
 382                         wlc->stf->hw_txchain = TXCHAIN_DEF_NPHY;
 383                 else
 384                         wlc->stf->hw_txchain = TXCHAIN_DEF;
 385         }
 386
 387         wlc->stf->txchain = wlc->stf->hw_txchain;
 388         wlc->stf->txstreams = (u8) hweight8(wlc->stf->hw_txchain);
 389
 390         if (wlc->stf->hw_rxchain == 0 || wlc->stf->hw_rxchain == 0xf) {
 391                 if (BRCMS_ISNPHY(wlc->band))
 392                         wlc->stf->hw_rxchain = RXCHAIN_DEF_NPHY;
 393                 else
 394                         wlc->stf->hw_rxchain = RXCHAIN_DEF;
 395         }
 396
 397         wlc->stf->rxchain = wlc->stf->hw_rxchain;
 398         wlc->stf->rxstreams = (u8) hweight8(wlc->stf->hw_rxchain);
 399
 400         /* initialize the txcore table */
 401         memcpy(wlc->stf->txcore, txcore_default, sizeof(wlc->stf->txcore));
 402
 403         /* default spatial_policy */
 404         wlc->stf->spatial_policy = MIN_SPATIAL_EXPANSION;
 405         brcms_c_stf_spatial_policy_set(wlc, MIN_SPATIAL_EXPANSION);
 406 }
 407
 408 static u16 _brcms_c_stf_phytxchain_sel(struct brcms_c_info *wlc,
 409                                        u32 rspec)
 410 {
 411         u16 phytxant = wlc->stf->phytxant;
 412
 413         if (rspec_stf(rspec) != PHY_TXC1_MODE_SISO)
 414                 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 415         else if (wlc->stf->txant == ANT_TX_DEF)
 416                 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 417         phytxant &= PHY_TXC_ANT_MASK;
 418         return phytxant;
 419 }
 420
 421 u16 brcms_c_stf_phytxchain_sel(struct brcms_c_info *wlc, u32 rspec)
 422 {
 423         return _brcms_c_stf_phytxchain_sel(wlc, rspec);
 424 }
 425
 426 u16 brcms_c_stf_d11hdrs_phyctl_txant(struct brcms_c_info *wlc, u32 rspec)
 427 {
 428         u16 phytxant = wlc->stf->phytxant;
 429         u16 mask = PHY_TXC_ANT_MASK;
 430
 431         /* for non-siso rates or default setting, use the available chains */
 432         if (BRCMS_ISNPHY(wlc->band)) {
 433                 phytxant = _brcms_c_stf_phytxchain_sel(wlc, rspec);
 434                 mask = PHY_TXC_HTANT_MASK;
 435         }
 436         phytxant |= phytxant & mask;
 437         return phytxant;
 438 }