drivers/net/wireless/iwlegacy/iwl-4965-calib.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
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   6  * GPL LICENSE SUMMARY
   7  *
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  44  *    the documentation and/or other materials provided with the
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  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *****************************************************************************/
  62
  63 #include <linux/slab.h>
  64 #include <net/mac80211.h>
  65
  66 #include "iwl-dev.h"
  67 #include "iwl-core.h"
  68 #include "iwl-4965-calib.h"
  69
  70 /*****************************************************************************
  71  * INIT calibrations framework
  72  *****************************************************************************/
  73
  74 struct statistics_general_data {
  75         u32 beacon_silence_rssi_a;
  76         u32 beacon_silence_rssi_b;
  77         u32 beacon_silence_rssi_c;
  78         u32 beacon_energy_a;
  79         u32 beacon_energy_b;
  80         u32 beacon_energy_c;
  81 };
  82
  83 void iwl4965_calib_free_results(struct iwl_priv *priv)
  84 {
  85         int i;
  86
  87         for (i = 0; i < IWL_CALIB_MAX; i++) {
  88                 kfree(priv->calib_results[i].buf);
  89                 priv->calib_results[i].buf = NULL;
  90                 priv->calib_results[i].buf_len = 0;
  91         }
  92 }
  93
  94 /*****************************************************************************
  95  * RUNTIME calibrations framework
  96  *****************************************************************************/
  97
  98 /* "false alarms" are signals that our DSP tries to lock onto,
  99  *   but then determines that they are either noise, or transmissions
 100  *   from a distant wireless network (also "noise", really) that get
 101  *   "stepped on" by stronger transmissions within our own network.
 102  * This algorithm attempts to set a sensitivity level that is high
 103  *   enough to receive all of our own network traffic, but not so
 104  *   high that our DSP gets too busy trying to lock onto non-network
 105  *   activity/noise. */
 106 static int iwl4965_sens_energy_cck(struct iwl_priv *priv,
 107                                    u32 norm_fa,
 108                                    u32 rx_enable_time,
 109                                    struct statistics_general_data *rx_info)
 110 {
 111         u32 max_nrg_cck = 0;
 112         int i = 0;
 113         u8 max_silence_rssi = 0;
 114         u32 silence_ref = 0;
 115         u8 silence_rssi_a = 0;
 116         u8 silence_rssi_b = 0;
 117         u8 silence_rssi_c = 0;
 118         u32 val;
 119
 120         /* "false_alarms" values below are cross-multiplications to assess the
 121          *   numbers of false alarms within the measured period of actual Rx
 122          *   (Rx is off when we're txing), vs the min/max expected false alarms
 123          *   (some should be expected if rx is sensitive enough) in a
 124          *   hypothetical listening period of 200 time units (TU), 204.8 msec:
 125          *
 126          * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
 127          *
 128          * */
 129         u32 false_alarms = norm_fa * 200 * 1024;
 130         u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
 131         u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
 132         struct iwl_sensitivity_data *data = NULL;
 133         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 134
 135         data = &(priv->sensitivity_data);
 136
 137         data->nrg_auto_corr_silence_diff = 0;
 138
 139         /* Find max silence rssi among all 3 receivers.
 140          * This is background noise, which may include transmissions from other
 141          *    networks, measured during silence before our network's beacon */
 142         silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
 143                             ALL_BAND_FILTER) >> 8);
 144         silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
 145                             ALL_BAND_FILTER) >> 8);
 146         silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
 147                             ALL_BAND_FILTER) >> 8);
 148
 149         val = max(silence_rssi_b, silence_rssi_c);
 150         max_silence_rssi = max(silence_rssi_a, (u8) val);
 151
 152         /* Store silence rssi in 20-beacon history table */
 153         data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
 154         data->nrg_silence_idx++;
 155         if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
 156                 data->nrg_silence_idx = 0;
 157
 158         /* Find max silence rssi across 20 beacon history */
 159         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
 160                 val = data->nrg_silence_rssi[i];
 161                 silence_ref = max(silence_ref, val);
 162         }
 163         IWL_DEBUG_CALIB(priv, "silence a %u, b %u, c %u, 20-bcn max %u\n",
 164                         silence_rssi_a, silence_rssi_b, silence_rssi_c,
 165                         silence_ref);
 166
 167         /* Find max rx energy (min value!) among all 3 receivers,
 168          *   measured during beacon frame.
 169          * Save it in 10-beacon history table. */
 170         i = data->nrg_energy_idx;
 171         val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
 172         data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
 173
 174         data->nrg_energy_idx++;
 175         if (data->nrg_energy_idx >= 10)
 176                 data->nrg_energy_idx = 0;
 177
 178         /* Find min rx energy (max value) across 10 beacon history.
 179          * This is the minimum signal level that we want to receive well.
 180          * Add backoff (margin so we don't miss slightly lower energy frames).
 181          * This establishes an upper bound (min value) for energy threshold. */
 182         max_nrg_cck = data->nrg_value[0];
 183         for (i = 1; i < 10; i++)
 184                 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
 185         max_nrg_cck += 6;
 186
 187         IWL_DEBUG_CALIB(priv, "rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
 188                         rx_info->beacon_energy_a, rx_info->beacon_energy_b,
 189                         rx_info->beacon_energy_c, max_nrg_cck - 6);
 190
 191         /* Count number of consecutive beacons with fewer-than-desired
 192          *   false alarms. */
 193         if (false_alarms < min_false_alarms)
 194                 data->num_in_cck_no_fa++;
 195         else
 196                 data->num_in_cck_no_fa = 0;
 197         IWL_DEBUG_CALIB(priv, "consecutive bcns with few false alarms = %u\n",
 198                         data->num_in_cck_no_fa);
 199
 200         /* If we got too many false alarms this time, reduce sensitivity */
 201         if ((false_alarms > max_false_alarms) &&
 202                 (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {
 203                 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u\n",
 204                      false_alarms, max_false_alarms);
 205                 IWL_DEBUG_CALIB(priv, "... reducing sensitivity\n");
 206                 data->nrg_curr_state = IWL_FA_TOO_MANY;
 207                 /* Store for "fewer than desired" on later beacon */
 208                 data->nrg_silence_ref = silence_ref;
 209
 210                 /* increase energy threshold (reduce nrg value)
 211                  *   to decrease sensitivity */
 212                 data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK;
 213         /* Else if we got fewer than desired, increase sensitivity */
 214         } else if (false_alarms < min_false_alarms) {
 215                 data->nrg_curr_state = IWL_FA_TOO_FEW;
 216
 217                 /* Compare silence level with silence level for most recent
 218                  *   healthy number or too many false alarms */
 219                 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
 220                                                    (s32)silence_ref;
 221
 222                 IWL_DEBUG_CALIB(priv,
 223                          "norm FA %u < min FA %u, silence diff %d\n",
 224                          false_alarms, min_false_alarms,
 225                          data->nrg_auto_corr_silence_diff);
 226
 227                 /* Increase value to increase sensitivity, but only if:
 228                  * 1a) previous beacon did *not* have *too many* false alarms
 229                  * 1b) AND there's a significant difference in Rx levels
 230                  *      from a previous beacon with too many, or healthy # FAs
 231                  * OR 2) We've seen a lot of beacons (100) with too few
 232                  *       false alarms */
 233                 if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
 234                         ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 235                         (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 236
 237                         IWL_DEBUG_CALIB(priv, "... increasing sensitivity\n");
 238                         /* Increase nrg value to increase sensitivity */
 239                         val = data->nrg_th_cck + NRG_STEP_CCK;
 240                         data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
 241                 } else {
 242                         IWL_DEBUG_CALIB(priv,
 243                                          "... but not changing sensitivity\n");
 244                 }
 245
 246         /* Else we got a healthy number of false alarms, keep status quo */
 247         } else {
 248                 IWL_DEBUG_CALIB(priv, " FA in safe zone\n");
 249                 data->nrg_curr_state = IWL_FA_GOOD_RANGE;
 250
 251                 /* Store for use in "fewer than desired" with later beacon */
 252                 data->nrg_silence_ref = silence_ref;
 253
 254                 /* If previous beacon had too many false alarms,
 255                  *   give it some extra margin by reducing sensitivity again
 256                  *   (but don't go below measured energy of desired Rx) */
 257                 if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
 258                         IWL_DEBUG_CALIB(priv, "... increasing margin\n");
 259                         if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
 260                                 data->nrg_th_cck -= NRG_MARGIN;
 261                         else
 262                                 data->nrg_th_cck = max_nrg_cck;
 263                 }
 264         }
 265
 266         /* Make sure the energy threshold does not go above the measured
 267          * energy of the desired Rx signals (reduced by backoff margin),
 268          * or else we might start missing Rx frames.
 269          * Lower value is higher energy, so we use max()!
 270          */
 271         data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
 272         IWL_DEBUG_CALIB(priv, "new nrg_th_cck %u\n", data->nrg_th_cck);
 273
 274         data->nrg_prev_state = data->nrg_curr_state;
 275
 276         /* Auto-correlation CCK algorithm */
 277         if (false_alarms > min_false_alarms) {
 278
 279                 /* increase auto_corr values to decrease sensitivity
 280                  * so the DSP won't be disturbed by the noise
 281                  */
 282                 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
 283                         data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
 284                 else {
 285                         val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
 286                         data->auto_corr_cck =
 287                                 min((u32)ranges->auto_corr_max_cck, val);
 288                 }
 289                 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
 290                 data->auto_corr_cck_mrc =
 291                         min((u32)ranges->auto_corr_max_cck_mrc, val);
 292         } else if ((false_alarms < min_false_alarms) &&
 293            ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 294            (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 295
 296                 /* Decrease auto_corr values to increase sensitivity */
 297                 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
 298                 data->auto_corr_cck =
 299                         max((u32)ranges->auto_corr_min_cck, val);
 300                 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
 301                 data->auto_corr_cck_mrc =
 302                         max((u32)ranges->auto_corr_min_cck_mrc, val);
 303         }
 304
 305         return 0;
 306 }
 307
 308
 309 static int iwl4965_sens_auto_corr_ofdm(struct iwl_priv *priv,
 310                                        u32 norm_fa,
 311                                        u32 rx_enable_time)
 312 {
 313         u32 val;
 314         u32 false_alarms = norm_fa * 200 * 1024;
 315         u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
 316         u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
 317         struct iwl_sensitivity_data *data = NULL;
 318         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 319
 320         data = &(priv->sensitivity_data);
 321
 322         /* If we got too many false alarms this time, reduce sensitivity */
 323         if (false_alarms > max_false_alarms) {
 324
 325                 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u)\n",
 326                              false_alarms, max_false_alarms);
 327
 328                 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
 329                 data->auto_corr_ofdm =
 330                         min((u32)ranges->auto_corr_max_ofdm, val);
 331
 332                 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
 333                 data->auto_corr_ofdm_mrc =
 334                         min((u32)ranges->auto_corr_max_ofdm_mrc, val);
 335
 336                 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
 337                 data->auto_corr_ofdm_x1 =
 338                         min((u32)ranges->auto_corr_max_ofdm_x1, val);
 339
 340                 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
 341                 data->auto_corr_ofdm_mrc_x1 =
 342                         min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
 343         }
 344
 345         /* Else if we got fewer than desired, increase sensitivity */
 346         else if (false_alarms < min_false_alarms) {
 347
 348                 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u\n",
 349                              false_alarms, min_false_alarms);
 350
 351                 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
 352                 data->auto_corr_ofdm =
 353                         max((u32)ranges->auto_corr_min_ofdm, val);
 354
 355                 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
 356                 data->auto_corr_ofdm_mrc =
 357                         max((u32)ranges->auto_corr_min_ofdm_mrc, val);
 358
 359                 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
 360                 data->auto_corr_ofdm_x1 =
 361                         max((u32)ranges->auto_corr_min_ofdm_x1, val);
 362
 363                 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
 364                 data->auto_corr_ofdm_mrc_x1 =
 365                         max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
 366         } else {
 367                 IWL_DEBUG_CALIB(priv, "min FA %u < norm FA %u < max FA %u OK\n",
 368                          min_false_alarms, false_alarms, max_false_alarms);
 369         }
 370         return 0;
 371 }
 372
 373 static void iwl4965_prepare_legacy_sensitivity_tbl(struct iwl_priv *priv,
 374                                 struct iwl_sensitivity_data *data,
 375                                 __le16 *tbl)
 376 {
 377         tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
 378                                 cpu_to_le16((u16)data->auto_corr_ofdm);
 379         tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
 380                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
 381         tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
 382                                 cpu_to_le16((u16)data->auto_corr_ofdm_x1);
 383         tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
 384                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
 385
 386         tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
 387                                 cpu_to_le16((u16)data->auto_corr_cck);
 388         tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
 389                                 cpu_to_le16((u16)data->auto_corr_cck_mrc);
 390
 391         tbl[HD_MIN_ENERGY_CCK_DET_INDEX] =
 392                                 cpu_to_le16((u16)data->nrg_th_cck);
 393         tbl[HD_MIN_ENERGY_OFDM_DET_INDEX] =
 394                                 cpu_to_le16((u16)data->nrg_th_ofdm);
 395
 396         tbl[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
 397                                 cpu_to_le16(data->barker_corr_th_min);
 398         tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
 399                                 cpu_to_le16(data->barker_corr_th_min_mrc);
 400         tbl[HD_OFDM_ENERGY_TH_IN_INDEX] =
 401                                 cpu_to_le16(data->nrg_th_cca);
 402
 403         IWL_DEBUG_CALIB(priv, "ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
 404                         data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
 405                         data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
 406                         data->nrg_th_ofdm);
 407
 408         IWL_DEBUG_CALIB(priv, "cck: ac %u mrc %u thresh %u\n",
 409                         data->auto_corr_cck, data->auto_corr_cck_mrc,
 410                         data->nrg_th_cck);
 411 }
 412
 413 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
 414 static int iwl4965_sensitivity_write(struct iwl_priv *priv)
 415 {
 416         struct iwl_sensitivity_cmd cmd;
 417         struct iwl_sensitivity_data *data = NULL;
 418         struct iwl_host_cmd cmd_out = {
 419                 .id = SENSITIVITY_CMD,
 420                 .len = sizeof(struct iwl_sensitivity_cmd),
 421                 .flags = CMD_ASYNC,
 422                 .data = &cmd,
 423         };
 424
 425         data = &(priv->sensitivity_data);
 426
 427         memset(&cmd, 0, sizeof(cmd));
 428
 429         iwl4965_prepare_legacy_sensitivity_tbl(priv, data, &cmd.table[0]);
 430
 431         /* Update uCode's "work" table, and copy it to DSP */
 432         cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
 433
 434         /* Don't send command to uCode if nothing has changed */
 435         if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
 436                     sizeof(u16)*HD_TABLE_SIZE)) {
 437                 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
 438                 return 0;
 439         }
 440
 441         /* Copy table for comparison next time */
 442         memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
 443                sizeof(u16)*HD_TABLE_SIZE);
 444
 445         return iwl_legacy_send_cmd(priv, &cmd_out);
 446 }
 447
 448 void iwl4965_init_sensitivity(struct iwl_priv *priv)
 449 {
 450         int ret = 0;
 451         int i;
 452         struct iwl_sensitivity_data *data = NULL;
 453         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 454
 455         if (priv->disable_sens_cal)
 456                 return;
 457
 458         IWL_DEBUG_CALIB(priv, "Start iwl4965_init_sensitivity\n");
 459
 460         /* Clear driver's sensitivity algo data */
 461         data = &(priv->sensitivity_data);
 462
 463         if (ranges == NULL)
 464                 return;
 465
 466         memset(data, 0, sizeof(struct iwl_sensitivity_data));
 467
 468         data->num_in_cck_no_fa = 0;
 469         data->nrg_curr_state = IWL_FA_TOO_MANY;
 470         data->nrg_prev_state = IWL_FA_TOO_MANY;
 471         data->nrg_silence_ref = 0;
 472         data->nrg_silence_idx = 0;
 473         data->nrg_energy_idx = 0;
 474
 475         for (i = 0; i < 10; i++)
 476                 data->nrg_value[i] = 0;
 477
 478         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
 479                 data->nrg_silence_rssi[i] = 0;
 480
 481         data->auto_corr_ofdm =  ranges->auto_corr_min_ofdm;
 482         data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
 483         data->auto_corr_ofdm_x1  = ranges->auto_corr_min_ofdm_x1;
 484         data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
 485         data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
 486         data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
 487         data->nrg_th_cck = ranges->nrg_th_cck;
 488         data->nrg_th_ofdm = ranges->nrg_th_ofdm;
 489         data->barker_corr_th_min = ranges->barker_corr_th_min;
 490         data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc;
 491         data->nrg_th_cca = ranges->nrg_th_cca;
 492
 493         data->last_bad_plcp_cnt_ofdm = 0;
 494         data->last_fa_cnt_ofdm = 0;
 495         data->last_bad_plcp_cnt_cck = 0;
 496         data->last_fa_cnt_cck = 0;
 497
 498         ret |= iwl4965_sensitivity_write(priv);
 499         IWL_DEBUG_CALIB(priv, "<<return 0x%X\n", ret);
 500 }
 501
 502 void iwl4965_sensitivity_calibration(struct iwl_priv *priv, void *resp)
 503 {
 504         u32 rx_enable_time;
 505         u32 fa_cck;
 506         u32 fa_ofdm;
 507         u32 bad_plcp_cck;
 508         u32 bad_plcp_ofdm;
 509         u32 norm_fa_ofdm;
 510         u32 norm_fa_cck;
 511         struct iwl_sensitivity_data *data = NULL;
 512         struct statistics_rx_non_phy *rx_info;
 513         struct statistics_rx_phy *ofdm, *cck;
 514         unsigned long flags;
 515         struct statistics_general_data statis;
 516
 517         if (priv->disable_sens_cal)
 518                 return;
 519
 520         data = &(priv->sensitivity_data);
 521
 522         if (!iwl_legacy_is_any_associated(priv)) {
 523                 IWL_DEBUG_CALIB(priv, "<< - not associated\n");
 524                 return;
 525         }
 526
 527         spin_lock_irqsave(&priv->lock, flags);
 528
 529         rx_info = &(((struct iwl_notif_statistics *)resp)->rx.general);
 530         ofdm = &(((struct iwl_notif_statistics *)resp)->rx.ofdm);
 531         cck = &(((struct iwl_notif_statistics *)resp)->rx.cck);
 532
 533         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 534                 IWL_DEBUG_CALIB(priv, "<< invalid data.\n");
 535                 spin_unlock_irqrestore(&priv->lock, flags);
 536                 return;
 537         }
 538
 539         /* Extract Statistics: */
 540         rx_enable_time = le32_to_cpu(rx_info->channel_load);
 541         fa_cck = le32_to_cpu(cck->false_alarm_cnt);
 542         fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt);
 543         bad_plcp_cck = le32_to_cpu(cck->plcp_err);
 544         bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err);
 545
 546         statis.beacon_silence_rssi_a =
 547                         le32_to_cpu(rx_info->beacon_silence_rssi_a);
 548         statis.beacon_silence_rssi_b =
 549                         le32_to_cpu(rx_info->beacon_silence_rssi_b);
 550         statis.beacon_silence_rssi_c =
 551                         le32_to_cpu(rx_info->beacon_silence_rssi_c);
 552         statis.beacon_energy_a =
 553                         le32_to_cpu(rx_info->beacon_energy_a);
 554         statis.beacon_energy_b =
 555                         le32_to_cpu(rx_info->beacon_energy_b);
 556         statis.beacon_energy_c =
 557                         le32_to_cpu(rx_info->beacon_energy_c);
 558
 559         spin_unlock_irqrestore(&priv->lock, flags);
 560
 561         IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time);
 562
 563         if (!rx_enable_time) {
 564                 IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0!\n");
 565                 return;
 566         }
 567
 568         /* These statistics increase monotonically, and do not reset
 569          *   at each beacon.  Calculate difference from last value, or just
 570          *   use the new statistics value if it has reset or wrapped around. */
 571         if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
 572                 data->last_bad_plcp_cnt_cck = bad_plcp_cck;
 573         else {
 574                 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
 575                 data->last_bad_plcp_cnt_cck += bad_plcp_cck;
 576         }
 577
 578         if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
 579                 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
 580         else {
 581                 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
 582                 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
 583         }
 584
 585         if (data->last_fa_cnt_ofdm > fa_ofdm)
 586                 data->last_fa_cnt_ofdm = fa_ofdm;
 587         else {
 588                 fa_ofdm -= data->last_fa_cnt_ofdm;
 589                 data->last_fa_cnt_ofdm += fa_ofdm;
 590         }
 591
 592         if (data->last_fa_cnt_cck > fa_cck)
 593                 data->last_fa_cnt_cck = fa_cck;
 594         else {
 595                 fa_cck -= data->last_fa_cnt_cck;
 596                 data->last_fa_cnt_cck += fa_cck;
 597         }
 598
 599         /* Total aborted signal locks */
 600         norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
 601         norm_fa_cck = fa_cck + bad_plcp_cck;
 602
 603         IWL_DEBUG_CALIB(priv,
 604                          "cck: fa %u badp %u  ofdm: fa %u badp %u\n", fa_cck,
 605                         bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
 606
 607         iwl4965_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
 608         iwl4965_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
 609
 610         iwl4965_sensitivity_write(priv);
 611 }
 612
 613 static inline u8 iwl4965_find_first_chain(u8 mask)
 614 {
 615         if (mask & ANT_A)
 616                 return CHAIN_A;
 617         if (mask & ANT_B)
 618                 return CHAIN_B;
 619         return CHAIN_C;
 620 }
 621
 622 /**
 623  * Run disconnected antenna algorithm to find out which antennas are
 624  * disconnected.
 625  */
 626 static void
 627 iwl4965_find_disconn_antenna(struct iwl_priv *priv, u32* average_sig,
 628                                      struct iwl_chain_noise_data *data)
 629 {
 630         u32 active_chains = 0;
 631         u32 max_average_sig;
 632         u16 max_average_sig_antenna_i;
 633         u8 num_tx_chains;
 634         u8 first_chain;
 635         u16 i = 0;
 636
 637         average_sig[0] = data->chain_signal_a /
 638                          priv->cfg->base_params->chain_noise_num_beacons;
 639         average_sig[1] = data->chain_signal_b /
 640                          priv->cfg->base_params->chain_noise_num_beacons;
 641         average_sig[2] = data->chain_signal_c /
 642                          priv->cfg->base_params->chain_noise_num_beacons;
 643
 644         if (average_sig[0] >= average_sig[1]) {
 645                 max_average_sig = average_sig[0];
 646                 max_average_sig_antenna_i = 0;
 647                 active_chains = (1 << max_average_sig_antenna_i);
 648         } else {
 649                 max_average_sig = average_sig[1];
 650                 max_average_sig_antenna_i = 1;
 651                 active_chains = (1 << max_average_sig_antenna_i);
 652         }
 653
 654         if (average_sig[2] >= max_average_sig) {
 655                 max_average_sig = average_sig[2];
 656                 max_average_sig_antenna_i = 2;
 657                 active_chains = (1 << max_average_sig_antenna_i);
 658         }
 659
 660         IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n",
 661                      average_sig[0], average_sig[1], average_sig[2]);
 662         IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n",
 663                      max_average_sig, max_average_sig_antenna_i);
 664
 665         /* Compare signal strengths for all 3 receivers. */
 666         for (i = 0; i < NUM_RX_CHAINS; i++) {
 667                 if (i != max_average_sig_antenna_i) {
 668                         s32 rssi_delta = (max_average_sig - average_sig[i]);
 669
 670                         /* If signal is very weak, compared with
 671                          * strongest, mark it as disconnected. */
 672                         if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
 673                                 data->disconn_array[i] = 1;
 674                         else
 675                                 active_chains |= (1 << i);
 676                         IWL_DEBUG_CALIB(priv, "i = %d  rssiDelta = %d  "
 677                              "disconn_array[i] = %d\n",
 678                              i, rssi_delta, data->disconn_array[i]);
 679                 }
 680         }
 681
 682         /*
 683          * The above algorithm sometimes fails when the ucode
 684          * reports 0 for all chains. It's not clear why that
 685          * happens to start with, but it is then causing trouble
 686          * because this can make us enable more chains than the
 687          * hardware really has.
 688          *
 689          * To be safe, simply mask out any chains that we know
 690          * are not on the device.
 691          */
 692         active_chains &= priv->hw_params.valid_rx_ant;
 693
 694         num_tx_chains = 0;
 695         for (i = 0; i < NUM_RX_CHAINS; i++) {
 696                 /* loops on all the bits of
 697                  * priv->hw_setting.valid_tx_ant */
 698                 u8 ant_msk = (1 << i);
 699                 if (!(priv->hw_params.valid_tx_ant & ant_msk))
 700                         continue;
 701
 702                 num_tx_chains++;
 703                 if (data->disconn_array[i] == 0)
 704                         /* there is a Tx antenna connected */
 705                         break;
 706                 if (num_tx_chains == priv->hw_params.tx_chains_num &&
 707                     data->disconn_array[i]) {
 708                         /*
 709                          * If all chains are disconnected
 710                          * connect the first valid tx chain
 711                          */
 712                         first_chain =
 713                         iwl4965_find_first_chain(priv->cfg->valid_tx_ant);
 714                         data->disconn_array[first_chain] = 0;
 715                         active_chains |= BIT(first_chain);
 716                         IWL_DEBUG_CALIB(priv,
 717                                         "All Tx chains are disconnected W/A - declare %d as connected\n",
 718                                         first_chain);
 719                         break;
 720                 }
 721         }
 722
 723         if (active_chains != priv->hw_params.valid_rx_ant &&
 724             active_chains != priv->chain_noise_data.active_chains)
 725                 IWL_DEBUG_CALIB(priv,
 726                                 "Detected that not all antennas are connected! "
 727                                 "Connected: %#x, valid: %#x.\n",
 728                                 active_chains, priv->hw_params.valid_rx_ant);
 729
 730         /* Save for use within RXON, TX, SCAN commands, etc. */
 731         data->active_chains = active_chains;
 732         IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",
 733                         active_chains);
 734 }
 735
 736 static void iwl4965_gain_computation(struct iwl_priv *priv,
 737                 u32 *average_noise,
 738                 u16 min_average_noise_antenna_i,
 739                 u32 min_average_noise,
 740                 u8 default_chain)
 741 {
 742         int i, ret;
 743         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 744
 745         data->delta_gain_code[min_average_noise_antenna_i] = 0;
 746
 747         for (i = default_chain; i < NUM_RX_CHAINS; i++) {
 748                 s32 delta_g = 0;
 749
 750                 if (!(data->disconn_array[i]) &&
 751                     (data->delta_gain_code[i] ==
 752                              CHAIN_NOISE_DELTA_GAIN_INIT_VAL)) {
 753                         delta_g = average_noise[i] - min_average_noise;
 754                         data->delta_gain_code[i] = (u8)((delta_g * 10) / 15);
 755                         data->delta_gain_code[i] =
 756                                 min(data->delta_gain_code[i],
 757                                 (u8) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);
 758
 759                         data->delta_gain_code[i] =
 760                                 (data->delta_gain_code[i] | (1 << 2));
 761                 } else {
 762                         data->delta_gain_code[i] = 0;
 763                 }
 764         }
 765         IWL_DEBUG_CALIB(priv, "delta_gain_codes: a %d b %d c %d\n",
 766                      data->delta_gain_code[0],
 767                      data->delta_gain_code[1],
 768                      data->delta_gain_code[2]);
 769
 770         /* Differential gain gets sent to uCode only once */
 771         if (!data->radio_write) {
 772                 struct iwl_calib_diff_gain_cmd cmd;
 773                 data->radio_write = 1;
 774
 775                 memset(&cmd, 0, sizeof(cmd));
 776                 cmd.hdr.op_code = IWL_PHY_CALIBRATE_DIFF_GAIN_CMD;
 777                 cmd.diff_gain_a = data->delta_gain_code[0];
 778                 cmd.diff_gain_b = data->delta_gain_code[1];
 779                 cmd.diff_gain_c = data->delta_gain_code[2];
 780                 ret = iwl_legacy_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
 781                                       sizeof(cmd), &cmd);
 782                 if (ret)
 783                         IWL_DEBUG_CALIB(priv, "fail sending cmd "
 784                                      "REPLY_PHY_CALIBRATION_CMD\n");
 785
 786                 /* TODO we might want recalculate
 787                  * rx_chain in rxon cmd */
 788
 789                 /* Mark so we run this algo only once! */
 790                 data->state = IWL_CHAIN_NOISE_CALIBRATED;
 791         }
 792 }
 793
 794
 795
 796 /*
 797  * Accumulate 16 beacons of signal and noise statistics for each of
 798  *   3 receivers/antennas/rx-chains, then figure out:
 799  * 1)  Which antennas are connected.
 800  * 2)  Differential rx gain settings to balance the 3 receivers.
 801  */
 802 void iwl4965_chain_noise_calibration(struct iwl_priv *priv, void *stat_resp)
 803 {
 804         struct iwl_chain_noise_data *data = NULL;
 805
 806         u32 chain_noise_a;
 807         u32 chain_noise_b;
 808         u32 chain_noise_c;
 809         u32 chain_sig_a;
 810         u32 chain_sig_b;
 811         u32 chain_sig_c;
 812         u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 813         u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 814         u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
 815         u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
 816         u16 i = 0;
 817         u16 rxon_chnum = INITIALIZATION_VALUE;
 818         u16 stat_chnum = INITIALIZATION_VALUE;
 819         u8 rxon_band24;
 820         u8 stat_band24;
 821         unsigned long flags;
 822         struct statistics_rx_non_phy *rx_info;
 823
 824         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 825
 826         if (priv->disable_chain_noise_cal)
 827                 return;
 828
 829         data = &(priv->chain_noise_data);
 830
 831         /*
 832          * Accumulate just the first "chain_noise_num_beacons" after
 833          * the first association, then we're done forever.
 834          */
 835         if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
 836                 if (data->state == IWL_CHAIN_NOISE_ALIVE)
 837                         IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n");
 838                 return;
 839         }
 840
 841         spin_lock_irqsave(&priv->lock, flags);
 842
 843         rx_info = &(((struct iwl_notif_statistics *)stat_resp)->
 844                       rx.general);
 845
 846         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 847                 IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n");
 848                 spin_unlock_irqrestore(&priv->lock, flags);
 849                 return;
 850         }
 851
 852         rxon_band24 = !!(ctx->staging.flags & RXON_FLG_BAND_24G_MSK);
 853         rxon_chnum = le16_to_cpu(ctx->staging.channel);
 854
 855         stat_band24 = !!(((struct iwl_notif_statistics *)
 856                          stat_resp)->flag &
 857                          STATISTICS_REPLY_FLG_BAND_24G_MSK);
 858         stat_chnum = le32_to_cpu(((struct iwl_notif_statistics *)
 859                                  stat_resp)->flag) >> 16;
 860
 861         /* Make sure we accumulate data for just the associated channel
 862          *   (even if scanning). */
 863         if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
 864                 IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n",
 865                                 rxon_chnum, rxon_band24);
 866                 spin_unlock_irqrestore(&priv->lock, flags);
 867                 return;
 868         }
 869
 870         /*
 871          *  Accumulate beacon statistics values across
 872          * "chain_noise_num_beacons"
 873          */
 874         chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
 875                                 IN_BAND_FILTER;
 876         chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
 877                                 IN_BAND_FILTER;
 878         chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
 879                                 IN_BAND_FILTER;
 880
 881         chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
 882         chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
 883         chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
 884
 885         spin_unlock_irqrestore(&priv->lock, flags);
 886
 887         data->beacon_count++;
 888
 889         data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
 890         data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
 891         data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
 892
 893         data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
 894         data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
 895         data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
 896
 897         IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n",
 898                         rxon_chnum, rxon_band24, data->beacon_count);
 899         IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n",
 900                         chain_sig_a, chain_sig_b, chain_sig_c);
 901         IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n",
 902                         chain_noise_a, chain_noise_b, chain_noise_c);
 903
 904         /* If this is the "chain_noise_num_beacons", determine:
 905          * 1)  Disconnected antennas (using signal strengths)
 906          * 2)  Differential gain (using silence noise) to balance receivers */
 907         if (data->beacon_count !=
 908                 priv->cfg->base_params->chain_noise_num_beacons)
 909                 return;
 910
 911         /* Analyze signal for disconnected antenna */
 912         iwl4965_find_disconn_antenna(priv, average_sig, data);
 913
 914         /* Analyze noise for rx balance */
 915         average_noise[0] = data->chain_noise_a /
 916                            priv->cfg->base_params->chain_noise_num_beacons;
 917         average_noise[1] = data->chain_noise_b /
 918                            priv->cfg->base_params->chain_noise_num_beacons;
 919         average_noise[2] = data->chain_noise_c /
 920                            priv->cfg->base_params->chain_noise_num_beacons;
 921
 922         for (i = 0; i < NUM_RX_CHAINS; i++) {
 923                 if (!(data->disconn_array[i]) &&
 924                    (average_noise[i] <= min_average_noise)) {
 925                         /* This means that chain i is active and has
 926                          * lower noise values so far: */
 927                         min_average_noise = average_noise[i];
 928                         min_average_noise_antenna_i = i;
 929                 }
 930         }
 931
 932         IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n",
 933                         average_noise[0], average_noise[1],
 934                         average_noise[2]);
 935
 936         IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n",
 937                         min_average_noise, min_average_noise_antenna_i);
 938
 939         iwl4965_gain_computation(priv, average_noise,
 940                         min_average_noise_antenna_i, min_average_noise,
 941                         iwl4965_find_first_chain(priv->cfg->valid_rx_ant));
 942
 943         /* Some power changes may have been made during the calibration.
 944          * Update and commit the RXON
 945          */
 946         if (priv->cfg->ops->lib->update_chain_flags)
 947                 priv->cfg->ops->lib->update_chain_flags(priv);
 948
 949         data->state = IWL_CHAIN_NOISE_DONE;
 950         iwl_legacy_power_update_mode(priv, false);
 951 }
 952
 953 void iwl4965_reset_run_time_calib(struct iwl_priv *priv)
 954 {
 955         int i;
 956         memset(&(priv->sensitivity_data), 0,
 957                sizeof(struct iwl_sensitivity_data));
 958         memset(&(priv->chain_noise_data), 0,
 959                sizeof(struct iwl_chain_noise_data));
 960         for (i = 0; i < NUM_RX_CHAINS; i++)
 961                 priv->chain_noise_data.delta_gain_code[i] =
 962                                 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
 963
 964         /* Ask for statistics now, the uCode will send notification
 965          * periodically after association */
 966         iwl_legacy_send_statistics_request(priv, CMD_ASYNC, true);
 967 }