LXR linux/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#include "debug.h"
  27
  28#define MIN_SPATIAL_EXPANSION   0
  29#define MAX_SPATIAL_EXPANSION   1
  30
  31#define BRCMS_STF_SS_STBC_RX(wlc) (BRCMS_ISNPHY(wlc->band) && \
  32        NREV_GT(wlc->band->phyrev, 3) && NREV_LE(wlc->band->phyrev, 6))
  33
  34#define NSTS_1  1
  35#define NSTS_2  2
  36#define NSTS_3  3
  37#define NSTS_4  4
  38
  39static const u8 txcore_default[5] = {
  40        (0),                    /* bitmap of the core enabled */
  41        (0x01),                 /* For Nsts = 1, enable core 1 */
  42        (0x03),                 /* For Nsts = 2, enable core 1 & 2 */
  43        (0x07),                 /* For Nsts = 3, enable core 1, 2 & 3 */
  44        (0x0f)                  /* For Nsts = 4, enable all cores */
  45};
  46
  47static void brcms_c_stf_stbc_rx_ht_update(struct brcms_c_info *wlc, int val)
  48{
  49        /* MIMOPHYs rev3-6 cannot receive STBC with only one rx core active */
  50        if (BRCMS_STF_SS_STBC_RX(wlc)) {
  51                if ((wlc->stf->rxstreams == 1) && (val != HT_CAP_RX_STBC_NO))
  52                        return;
  53        }
  54
  55        if (wlc->pub->up) {
  56                brcms_c_update_beacon(wlc);
  57                brcms_c_update_probe_resp(wlc, true);
  58        }
  59}
  60
  61/*
  62 * every WLC_TEMPSENSE_PERIOD seconds temperature check to decide whether to
  63 * turn on/off txchain.
  64 */
  65void brcms_c_tempsense_upd(struct brcms_c_info *wlc)
  66{
  67        struct brcms_phy_pub *pi = wlc->band->pi;
  68        uint active_chains, txchain;
  69
  70        /* Check if the chip is too hot. Disable one Tx chain, if it is */
  71        /* high 4 bits are for Rx chain, low 4 bits are  for Tx chain */
  72        active_chains = wlc_phy_stf_chain_active_get(pi);
  73        txchain = active_chains & 0xf;
  74
  75        if (wlc->stf->txchain == wlc->stf->hw_txchain) {
  76                if (txchain && (txchain < wlc->stf->hw_txchain))
  77                        /* turn off 1 tx chain */
  78                        brcms_c_stf_txchain_set(wlc, txchain, true);
  79        } else if (wlc->stf->txchain < wlc->stf->hw_txchain) {
  80                if (txchain == wlc->stf->hw_txchain)
  81                        /* turn back on txchain */
  82                        brcms_c_stf_txchain_set(wlc, txchain, true);
  83        }
  84}
  85
  86void
  87brcms_c_stf_ss_algo_channel_get(struct brcms_c_info *wlc, u16 *ss_algo_channel,
  88                            u16 chanspec)
  89{
  90        struct tx_power power;
  91        u8 siso_mcs_id, cdd_mcs_id, stbc_mcs_id;
  92
  93        /* Clear previous settings */
  94        *ss_algo_channel = 0;
  95
  96        if (!wlc->pub->up) {
  97                *ss_algo_channel = (u16) -1;
  98                return;
  99        }
 100
 101        wlc_phy_txpower_get_current(wlc->band->pi, &power,
 102                                    CHSPEC_CHANNEL(chanspec));
 103
 104        siso_mcs_id = (CHSPEC_IS40(chanspec)) ?
 105            WL_TX_POWER_MCS40_SISO_FIRST : WL_TX_POWER_MCS20_SISO_FIRST;
 106        cdd_mcs_id = (CHSPEC_IS40(chanspec)) ?
 107            WL_TX_POWER_MCS40_CDD_FIRST : WL_TX_POWER_MCS20_CDD_FIRST;
 108        stbc_mcs_id = (CHSPEC_IS40(chanspec)) ?
 109            WL_TX_POWER_MCS40_STBC_FIRST : WL_TX_POWER_MCS20_STBC_FIRST;
 110
 111        /* criteria to choose stf mode */
 112
 113        /*
 114         * the "+3dbm (12 0.25db units)" is to account for the fact that with
 115         * CDD, tx occurs on both chains
 116         */
 117        if (power.target[siso_mcs_id] > (power.target[cdd_mcs_id] + 12))
 118                setbit(ss_algo_channel, PHY_TXC1_MODE_SISO);
 119        else
 120                setbit(ss_algo_channel, PHY_TXC1_MODE_CDD);
 121
 122        /*
 123         * STBC is ORed into to algo channel as STBC requires per-packet SCB
 124         * capability check so cannot be default mode of operation. One of
 125         * SISO, CDD have to be set
 126         */
 127        if (power.target[siso_mcs_id] <= (power.target[stbc_mcs_id] + 12))
 128                setbit(ss_algo_channel, PHY_TXC1_MODE_STBC);
 129}
 130
 131static bool brcms_c_stf_stbc_tx_set(struct brcms_c_info *wlc, s32 int_val)
 132{
 133        if ((int_val != AUTO) && (int_val != OFF) && (int_val != ON))
 134                return false;
 135
 136        if ((int_val == ON) && (wlc->stf->txstreams == 1))
 137                return false;
 138
 139        wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 140        wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = (s8) int_val;
 141
 142        return true;
 143}
 144
 145bool brcms_c_stf_stbc_rx_set(struct brcms_c_info *wlc, s32 int_val)
 146{
 147        if ((int_val != HT_CAP_RX_STBC_NO)
 148            && (int_val != HT_CAP_RX_STBC_ONE_STREAM))
 149                return false;
 150
 151        if (BRCMS_STF_SS_STBC_RX(wlc)) {
 152                if ((int_val != HT_CAP_RX_STBC_NO)
 153                    && (wlc->stf->rxstreams == 1))
 154                        return false;
 155        }
 156
 157        brcms_c_stf_stbc_rx_ht_update(wlc, int_val);
 158        return true;
 159}
 160
 161static int brcms_c_stf_txcore_set(struct brcms_c_info *wlc, u8 Nsts,
 162                                  u8 core_mask)
 163{
 164        brcms_dbg_ht(wlc->hw->d11core, "wl%d: Nsts %d core_mask %x\n",
 165                     wlc->pub->unit, Nsts, core_mask);
 166
 167        if (hweight8(core_mask) > wlc->stf->txstreams)
 168                core_mask = 0;
 169
 170        if ((hweight8(core_mask) == wlc->stf->txstreams) &&
 171            ((core_mask & ~wlc->stf->txchain)
 172             || !(core_mask & wlc->stf->txchain)))
 173                core_mask = wlc->stf->txchain;
 174
 175        wlc->stf->txcore[Nsts] = core_mask;
 176        /* Nsts = 1..4, txcore index = 1..4 */
 177        if (Nsts == 1) {
 178                /* Needs to update beacon and ucode generated response
 179                 * frames when 1 stream core map changed
 180                 */
 181                wlc->stf->phytxant = core_mask << PHY_TXC_ANT_SHIFT;
 182                brcms_b_txant_set(wlc->hw, wlc->stf->phytxant);
 183                if (wlc->clk) {
 184                        brcms_c_suspend_mac_and_wait(wlc);
 185                        brcms_c_beacon_phytxctl_txant_upd(wlc, wlc->bcn_rspec);
 186                        brcms_c_enable_mac(wlc);
 187                }
 188        }
 189
 190        return 0;
 191}
 192
 193static int brcms_c_stf_spatial_policy_set(struct brcms_c_info *wlc, int val)
 194{
 195        int i;
 196        u8 core_mask = 0;
 197
 198        brcms_dbg_ht(wlc->hw->d11core, "wl%d: val %x\n", wlc->pub->unit,
 199                     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*/
 226static 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
 264int 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 */
 307int 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
 340int 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
 364void brcms_c_stf_detach(struct brcms_c_info *wlc)
 365{
 366}
 367
 368void brcms_c_stf_phy_txant_upd(struct brcms_c_info *wlc)
 369{
 370        _brcms_c_stf_phy_txant_upd(wlc);
 371}
 372
 373void brcms_c_stf_phy_chain_calc(struct brcms_c_info *wlc)
 374{
 375        struct ssb_sprom *sprom = &wlc->hw->d11core->bus->sprom;
 376
 377        /* get available rx/tx chains */
 378        wlc->stf->hw_txchain = sprom->txchain;
 379        wlc->stf->hw_rxchain = sprom->rxchain;
 380
 381        /* these parameter are intended to be used for all PHY types */
 382        if (wlc->stf->hw_txchain == 0 || wlc->stf->hw_txchain == 0xf) {
 383                if (BRCMS_ISNPHY(wlc->band))
 384                        wlc->stf->hw_txchain = TXCHAIN_DEF_NPHY;
 385                else
 386                        wlc->stf->hw_txchain = TXCHAIN_DEF;
 387        }
 388
 389        wlc->stf->txchain = wlc->stf->hw_txchain;
 390        wlc->stf->txstreams = (u8) hweight8(wlc->stf->hw_txchain);
 391
 392        if (wlc->stf->hw_rxchain == 0 || wlc->stf->hw_rxchain == 0xf) {
 393                if (BRCMS_ISNPHY(wlc->band))
 394                        wlc->stf->hw_rxchain = RXCHAIN_DEF_NPHY;
 395                else
 396                        wlc->stf->hw_rxchain = RXCHAIN_DEF;
 397        }
 398
 399        wlc->stf->rxchain = wlc->stf->hw_rxchain;
 400        wlc->stf->rxstreams = (u8) hweight8(wlc->stf->hw_rxchain);
 401
 402        /* initialize the txcore table */
 403        memcpy(wlc->stf->txcore, txcore_default, sizeof(wlc->stf->txcore));
 404
 405        /* default spatial_policy */
 406        wlc->stf->spatial_policy = MIN_SPATIAL_EXPANSION;
 407        brcms_c_stf_spatial_policy_set(wlc, MIN_SPATIAL_EXPANSION);
 408}
 409
 410static u16 _brcms_c_stf_phytxchain_sel(struct brcms_c_info *wlc,
 411                                       u32 rspec)
 412{
 413        u16 phytxant = wlc->stf->phytxant;
 414
 415        if (rspec_stf(rspec) != PHY_TXC1_MODE_SISO)
 416                phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 417        else if (wlc->stf->txant == ANT_TX_DEF)
 418                phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
 419        phytxant &= PHY_TXC_ANT_MASK;
 420        return phytxant;
 421}
 422
 423u16 brcms_c_stf_phytxchain_sel(struct brcms_c_info *wlc, u32 rspec)
 424{
 425        return _brcms_c_stf_phytxchain_sel(wlc, rspec);
 426}
 427
 428u16 brcms_c_stf_d11hdrs_phyctl_txant(struct brcms_c_info *wlc, u32 rspec)
 429{
 430        u16 phytxant = wlc->stf->phytxant;
 431        u16 mask = PHY_TXC_ANT_MASK;
 432
 433        /* for non-siso rates or default setting, use the available chains */
 434        if (BRCMS_ISNPHY(wlc->band)) {
 435                phytxant = _brcms_c_stf_phytxchain_sel(wlc, rspec);
 436                mask = PHY_TXC_HTANT_MASK;
 437        }
 438        phytxant |= phytxant & mask;
 439        return phytxant;
 440}
 441