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   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2008 Intel Corporation. All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called LICENSE.GPL.
  26  *
  27  * Contact Information:
  28  * Tomas Winkler <tomas.winkler@intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  *
  40  *  * Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  *  * Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
  46  *  * Neither the name Intel Corporation nor the names of its
  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  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,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  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 <net/mac80211.h>
  64
  65 #include "iwl-dev.h"
  66 #include "iwl-core.h"
  67 #include "iwl-calib.h"
  68
  69 /*****************************************************************************
  70  * INIT calibrations framework
  71  *****************************************************************************/
  72
  73 int iwl_send_calib_results(struct iwl_priv *priv)
  74 {
  75         int ret = 0;
  76         int i = 0;
  77
  78         struct iwl_host_cmd hcmd = {
  79                 .id = REPLY_PHY_CALIBRATION_CMD,
  80                 .meta.flags = CMD_SIZE_HUGE,
  81         };
  82
  83         for (i = 0; i < IWL_CALIB_MAX; i++) {
  84                 if ((BIT(i) & priv->hw_params.calib_init_cfg) &&
  85                     priv->calib_results[i].buf) {
  86                         hcmd.len = priv->calib_results[i].buf_len;
  87                         hcmd.data = priv->calib_results[i].buf;
  88                         ret = iwl_send_cmd_sync(priv, &hcmd);
  89                         if (ret)
  90                                 goto err;
  91                 }
  92         }
  93
  94         return 0;
  95 err:
  96         IWL_ERROR("Error %d iteration %d\n", ret, i);
  97         return ret;
  98 }
  99 EXPORT_SYMBOL(iwl_send_calib_results);
 100
 101 int iwl_calib_set(struct iwl_calib_result *res, const u8 *buf, int len)
 102 {
 103         if (res->buf_len != len) {
 104                 kfree(res->buf);
 105                 res->buf = kzalloc(len, GFP_ATOMIC);
 106         }
 107         if (unlikely(res->buf == NULL))
 108                 return -ENOMEM;
 109
 110         res->buf_len = len;
 111         memcpy(res->buf, buf, len);
 112         return 0;
 113 }
 114 EXPORT_SYMBOL(iwl_calib_set);
 115
 116 void iwl_calib_free_results(struct iwl_priv *priv)
 117 {
 118         int i;
 119
 120         for (i = 0; i < IWL_CALIB_MAX; i++) {
 121                 kfree(priv->calib_results[i].buf);
 122                 priv->calib_results[i].buf = NULL;
 123                 priv->calib_results[i].buf_len = 0;
 124         }
 125 }
 126
 127 /*****************************************************************************
 128  * RUNTIME calibrations framework
 129  *****************************************************************************/
 130
 131 /* "false alarms" are signals that our DSP tries to lock onto,
 132  *   but then determines that they are either noise, or transmissions
 133  *   from a distant wireless network (also "noise", really) that get
 134  *   "stepped on" by stronger transmissions within our own network.
 135  * This algorithm attempts to set a sensitivity level that is high
 136  *   enough to receive all of our own network traffic, but not so
 137  *   high that our DSP gets too busy trying to lock onto non-network
 138  *   activity/noise. */
 139 static int iwl_sens_energy_cck(struct iwl_priv *priv,
 140                                    u32 norm_fa,
 141                                    u32 rx_enable_time,
 142                                    struct statistics_general_data *rx_info)
 143 {
 144         u32 max_nrg_cck = 0;
 145         int i = 0;
 146         u8 max_silence_rssi = 0;
 147         u32 silence_ref = 0;
 148         u8 silence_rssi_a = 0;
 149         u8 silence_rssi_b = 0;
 150         u8 silence_rssi_c = 0;
 151         u32 val;
 152
 153         /* "false_alarms" values below are cross-multiplications to assess the
 154          *   numbers of false alarms within the measured period of actual Rx
 155          *   (Rx is off when we're txing), vs the min/max expected false alarms
 156          *   (some should be expected if rx is sensitive enough) in a
 157          *   hypothetical listening period of 200 time units (TU), 204.8 msec:
 158          *
 159          * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
 160          *
 161          * */
 162         u32 false_alarms = norm_fa * 200 * 1024;
 163         u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
 164         u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
 165         struct iwl_sensitivity_data *data = NULL;
 166         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 167
 168         data = &(priv->sensitivity_data);
 169
 170         data->nrg_auto_corr_silence_diff = 0;
 171
 172         /* Find max silence rssi among all 3 receivers.
 173          * This is background noise, which may include transmissions from other
 174          *    networks, measured during silence before our network's beacon */
 175         silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
 176                             ALL_BAND_FILTER) >> 8);
 177         silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
 178                             ALL_BAND_FILTER) >> 8);
 179         silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
 180                             ALL_BAND_FILTER) >> 8);
 181
 182         val = max(silence_rssi_b, silence_rssi_c);
 183         max_silence_rssi = max(silence_rssi_a, (u8) val);
 184
 185         /* Store silence rssi in 20-beacon history table */
 186         data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
 187         data->nrg_silence_idx++;
 188         if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
 189                 data->nrg_silence_idx = 0;
 190
 191         /* Find max silence rssi across 20 beacon history */
 192         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
 193                 val = data->nrg_silence_rssi[i];
 194                 silence_ref = max(silence_ref, val);
 195         }
 196         IWL_DEBUG_CALIB("silence a %u, b %u, c %u, 20-bcn max %u\n",
 197                         silence_rssi_a, silence_rssi_b, silence_rssi_c,
 198                         silence_ref);
 199
 200         /* Find max rx energy (min value!) among all 3 receivers,
 201          *   measured during beacon frame.
 202          * Save it in 10-beacon history table. */
 203         i = data->nrg_energy_idx;
 204         val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
 205         data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
 206
 207         data->nrg_energy_idx++;
 208         if (data->nrg_energy_idx >= 10)
 209                 data->nrg_energy_idx = 0;
 210
 211         /* Find min rx energy (max value) across 10 beacon history.
 212          * This is the minimum signal level that we want to receive well.
 213          * Add backoff (margin so we don't miss slightly lower energy frames).
 214          * This establishes an upper bound (min value) for energy threshold. */
 215         max_nrg_cck = data->nrg_value[0];
 216         for (i = 1; i < 10; i++)
 217                 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
 218         max_nrg_cck += 6;
 219
 220         IWL_DEBUG_CALIB("rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
 221                         rx_info->beacon_energy_a, rx_info->beacon_energy_b,
 222                         rx_info->beacon_energy_c, max_nrg_cck - 6);
 223
 224         /* Count number of consecutive beacons with fewer-than-desired
 225          *   false alarms. */
 226         if (false_alarms < min_false_alarms)
 227                 data->num_in_cck_no_fa++;
 228         else
 229                 data->num_in_cck_no_fa = 0;
 230         IWL_DEBUG_CALIB("consecutive bcns with few false alarms = %u\n",
 231                         data->num_in_cck_no_fa);
 232
 233         /* If we got too many false alarms this time, reduce sensitivity */
 234         if ((false_alarms > max_false_alarms) &&
 235                 (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {
 236                 IWL_DEBUG_CALIB("norm FA %u > max FA %u\n",
 237                      false_alarms, max_false_alarms);
 238                 IWL_DEBUG_CALIB("... reducing sensitivity\n");
 239                 data->nrg_curr_state = IWL_FA_TOO_MANY;
 240                 /* Store for "fewer than desired" on later beacon */
 241                 data->nrg_silence_ref = silence_ref;
 242
 243                 /* increase energy threshold (reduce nrg value)
 244                  *   to decrease sensitivity */
 245                 if (data->nrg_th_cck >
 246                         (ranges->max_nrg_cck + NRG_STEP_CCK))
 247                         data->nrg_th_cck = data->nrg_th_cck
 248                                                  - NRG_STEP_CCK;
 249                 else
 250                         data->nrg_th_cck = ranges->max_nrg_cck;
 251         /* Else if we got fewer than desired, increase sensitivity */
 252         } else if (false_alarms < min_false_alarms) {
 253                 data->nrg_curr_state = IWL_FA_TOO_FEW;
 254
 255                 /* Compare silence level with silence level for most recent
 256                  *   healthy number or too many false alarms */
 257                 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
 258                                                    (s32)silence_ref;
 259
 260                 IWL_DEBUG_CALIB("norm FA %u < min FA %u, silence diff %d\n",
 261                          false_alarms, min_false_alarms,
 262                          data->nrg_auto_corr_silence_diff);
 263
 264                 /* Increase value to increase sensitivity, but only if:
 265                  * 1a) previous beacon did *not* have *too many* false alarms
 266                  * 1b) AND there's a significant difference in Rx levels
 267                  *      from a previous beacon with too many, or healthy # FAs
 268                  * OR 2) We've seen a lot of beacons (100) with too few
 269                  *       false alarms */
 270                 if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
 271                         ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 272                         (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 273
 274                         IWL_DEBUG_CALIB("... increasing sensitivity\n");
 275                         /* Increase nrg value to increase sensitivity */
 276                         val = data->nrg_th_cck + NRG_STEP_CCK;
 277                         data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
 278                 } else {
 279                         IWL_DEBUG_CALIB("... but not changing sensitivity\n");
 280                 }
 281
 282         /* Else we got a healthy number of false alarms, keep status quo */
 283         } else {
 284                 IWL_DEBUG_CALIB(" FA in safe zone\n");
 285                 data->nrg_curr_state = IWL_FA_GOOD_RANGE;
 286
 287                 /* Store for use in "fewer than desired" with later beacon */
 288                 data->nrg_silence_ref = silence_ref;
 289
 290                 /* If previous beacon had too many false alarms,
 291                  *   give it some extra margin by reducing sensitivity again
 292                  *   (but don't go below measured energy of desired Rx) */
 293                 if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
 294                         IWL_DEBUG_CALIB("... increasing margin\n");
 295                         if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
 296                                 data->nrg_th_cck -= NRG_MARGIN;
 297                         else
 298                                 data->nrg_th_cck = max_nrg_cck;
 299                 }
 300         }
 301
 302         /* Make sure the energy threshold does not go above the measured
 303          * energy of the desired Rx signals (reduced by backoff margin),
 304          * or else we might start missing Rx frames.
 305          * Lower value is higher energy, so we use max()!
 306          */
 307         data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
 308         IWL_DEBUG_CALIB("new nrg_th_cck %u\n", data->nrg_th_cck);
 309
 310         data->nrg_prev_state = data->nrg_curr_state;
 311
 312         /* Auto-correlation CCK algorithm */
 313         if (false_alarms > min_false_alarms) {
 314
 315                 /* increase auto_corr values to decrease sensitivity
 316                  * so the DSP won't be disturbed by the noise
 317                  */
 318                 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
 319                         data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
 320                 else {
 321                         val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
 322                         data->auto_corr_cck =
 323                                 min((u32)ranges->auto_corr_max_cck, val);
 324                 }
 325                 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
 326                 data->auto_corr_cck_mrc =
 327                         min((u32)ranges->auto_corr_max_cck_mrc, val);
 328         } else if ((false_alarms < min_false_alarms) &&
 329            ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 330            (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 331
 332                 /* Decrease auto_corr values to increase sensitivity */
 333                 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
 334                 data->auto_corr_cck =
 335                         max((u32)ranges->auto_corr_min_cck, val);
 336                 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
 337                 data->auto_corr_cck_mrc =
 338                         max((u32)ranges->auto_corr_min_cck_mrc, val);
 339         }
 340
 341         return 0;
 342 }
 343
 344
 345 static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,
 346                                        u32 norm_fa,
 347                                        u32 rx_enable_time)
 348 {
 349         u32 val;
 350         u32 false_alarms = norm_fa * 200 * 1024;
 351         u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
 352         u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
 353         struct iwl_sensitivity_data *data = NULL;
 354         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 355
 356         data = &(priv->sensitivity_data);
 357
 358         /* If we got too many false alarms this time, reduce sensitivity */
 359         if (false_alarms > max_false_alarms) {
 360
 361                 IWL_DEBUG_CALIB("norm FA %u > max FA %u)\n",
 362                              false_alarms, max_false_alarms);
 363
 364                 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
 365                 data->auto_corr_ofdm =
 366                         min((u32)ranges->auto_corr_max_ofdm, val);
 367
 368                 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
 369                 data->auto_corr_ofdm_mrc =
 370                         min((u32)ranges->auto_corr_max_ofdm_mrc, val);
 371
 372                 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
 373                 data->auto_corr_ofdm_x1 =
 374                         min((u32)ranges->auto_corr_max_ofdm_x1, val);
 375
 376                 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
 377                 data->auto_corr_ofdm_mrc_x1 =
 378                         min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
 379         }
 380
 381         /* Else if we got fewer than desired, increase sensitivity */
 382         else if (false_alarms < min_false_alarms) {
 383
 384                 IWL_DEBUG_CALIB("norm FA %u < min FA %u\n",
 385                              false_alarms, min_false_alarms);
 386
 387                 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
 388                 data->auto_corr_ofdm =
 389                         max((u32)ranges->auto_corr_min_ofdm, val);
 390
 391                 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
 392                 data->auto_corr_ofdm_mrc =
 393                         max((u32)ranges->auto_corr_min_ofdm_mrc, val);
 394
 395                 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
 396                 data->auto_corr_ofdm_x1 =
 397                         max((u32)ranges->auto_corr_min_ofdm_x1, val);
 398
 399                 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
 400                 data->auto_corr_ofdm_mrc_x1 =
 401                         max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
 402         } else {
 403                 IWL_DEBUG_CALIB("min FA %u < norm FA %u < max FA %u OK\n",
 404                          min_false_alarms, false_alarms, max_false_alarms);
 405         }
 406         return 0;
 407 }
 408
 409 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
 410 static int iwl_sensitivity_write(struct iwl_priv *priv)
 411 {
 412         int ret = 0;
 413         struct iwl_sensitivity_cmd cmd ;
 414         struct iwl_sensitivity_data *data = NULL;
 415         struct iwl_host_cmd cmd_out = {
 416                 .id = SENSITIVITY_CMD,
 417                 .len = sizeof(struct iwl_sensitivity_cmd),
 418                 .meta.flags = CMD_ASYNC,
 419                 .data = &cmd,
 420         };
 421
 422         data = &(priv->sensitivity_data);
 423
 424         memset(&cmd, 0, sizeof(cmd));
 425
 426         cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
 427                                 cpu_to_le16((u16)data->auto_corr_ofdm);
 428         cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
 429                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
 430         cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
 431                                 cpu_to_le16((u16)data->auto_corr_ofdm_x1);
 432         cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
 433                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
 434
 435         cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
 436                                 cpu_to_le16((u16)data->auto_corr_cck);
 437         cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
 438                                 cpu_to_le16((u16)data->auto_corr_cck_mrc);
 439
 440         cmd.table[HD_MIN_ENERGY_CCK_DET_INDEX] =
 441                                 cpu_to_le16((u16)data->nrg_th_cck);
 442         cmd.table[HD_MIN_ENERGY_OFDM_DET_INDEX] =
 443                                 cpu_to_le16((u16)data->nrg_th_ofdm);
 444
 445         cmd.table[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
 446                                 __constant_cpu_to_le16(190);
 447         cmd.table[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
 448                                 __constant_cpu_to_le16(390);
 449         cmd.table[HD_OFDM_ENERGY_TH_IN_INDEX] =
 450                                 __constant_cpu_to_le16(62);
 451
 452         IWL_DEBUG_CALIB("ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
 453                         data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
 454                         data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
 455                         data->nrg_th_ofdm);
 456
 457         IWL_DEBUG_CALIB("cck: ac %u mrc %u thresh %u\n",
 458                         data->auto_corr_cck, data->auto_corr_cck_mrc,
 459                         data->nrg_th_cck);
 460
 461         /* Update uCode's "work" table, and copy it to DSP */
 462         cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
 463
 464         /* Don't send command to uCode if nothing has changed */
 465         if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
 466                     sizeof(u16)*HD_TABLE_SIZE)) {
 467                 IWL_DEBUG_CALIB("No change in SENSITIVITY_CMD\n");
 468                 return 0;
 469         }
 470
 471         /* Copy table for comparison next time */
 472         memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
 473                sizeof(u16)*HD_TABLE_SIZE);
 474
 475         ret = iwl_send_cmd(priv, &cmd_out);
 476         if (ret)
 477                 IWL_ERROR("SENSITIVITY_CMD failed\n");
 478
 479         return ret;
 480 }
 481
 482 void iwl_init_sensitivity(struct iwl_priv *priv)
 483 {
 484         int ret = 0;
 485         int i;
 486         struct iwl_sensitivity_data *data = NULL;
 487         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 488
 489         if (priv->disable_sens_cal)
 490                 return;
 491
 492         IWL_DEBUG_CALIB("Start iwl_init_sensitivity\n");
 493
 494         /* Clear driver's sensitivity algo data */
 495         data = &(priv->sensitivity_data);
 496
 497         if (ranges == NULL)
 498                 return;
 499
 500         memset(data, 0, sizeof(struct iwl_sensitivity_data));
 501
 502         data->num_in_cck_no_fa = 0;
 503         data->nrg_curr_state = IWL_FA_TOO_MANY;
 504         data->nrg_prev_state = IWL_FA_TOO_MANY;
 505         data->nrg_silence_ref = 0;
 506         data->nrg_silence_idx = 0;
 507         data->nrg_energy_idx = 0;
 508
 509         for (i = 0; i < 10; i++)
 510                 data->nrg_value[i] = 0;
 511
 512         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
 513                 data->nrg_silence_rssi[i] = 0;
 514
 515         data->auto_corr_ofdm = 90;
 516         data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
 517         data->auto_corr_ofdm_x1  = ranges->auto_corr_min_ofdm_x1;
 518         data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
 519         data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
 520         data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
 521         data->nrg_th_cck = ranges->nrg_th_cck;
 522         data->nrg_th_ofdm = ranges->nrg_th_ofdm;
 523
 524         data->last_bad_plcp_cnt_ofdm = 0;
 525         data->last_fa_cnt_ofdm = 0;
 526         data->last_bad_plcp_cnt_cck = 0;
 527         data->last_fa_cnt_cck = 0;
 528
 529         ret |= iwl_sensitivity_write(priv);
 530         IWL_DEBUG_CALIB("<<return 0x%X\n", ret);
 531 }
 532 EXPORT_SYMBOL(iwl_init_sensitivity);
 533
 534 void iwl_sensitivity_calibration(struct iwl_priv *priv,
 535                                     struct iwl_notif_statistics *resp)
 536 {
 537         u32 rx_enable_time;
 538         u32 fa_cck;
 539         u32 fa_ofdm;
 540         u32 bad_plcp_cck;
 541         u32 bad_plcp_ofdm;
 542         u32 norm_fa_ofdm;
 543         u32 norm_fa_cck;
 544         struct iwl_sensitivity_data *data = NULL;
 545         struct statistics_rx_non_phy *rx_info = &(resp->rx.general);
 546         struct statistics_rx *statistics = &(resp->rx);
 547         unsigned long flags;
 548         struct statistics_general_data statis;
 549
 550         if (priv->disable_sens_cal)
 551                 return;
 552
 553         data = &(priv->sensitivity_data);
 554
 555         if (!iwl_is_associated(priv)) {
 556                 IWL_DEBUG_CALIB("<< - not associated\n");
 557                 return;
 558         }
 559
 560         spin_lock_irqsave(&priv->lock, flags);
 561         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 562                 IWL_DEBUG_CALIB("<< invalid data.\n");
 563                 spin_unlock_irqrestore(&priv->lock, flags);
 564                 return;
 565         }
 566
 567         /* Extract Statistics: */
 568         rx_enable_time = le32_to_cpu(rx_info->channel_load);
 569         fa_cck = le32_to_cpu(statistics->cck.false_alarm_cnt);
 570         fa_ofdm = le32_to_cpu(statistics->ofdm.false_alarm_cnt);
 571         bad_plcp_cck = le32_to_cpu(statistics->cck.plcp_err);
 572         bad_plcp_ofdm = le32_to_cpu(statistics->ofdm.plcp_err);
 573
 574         statis.beacon_silence_rssi_a =
 575                         le32_to_cpu(statistics->general.beacon_silence_rssi_a);
 576         statis.beacon_silence_rssi_b =
 577                         le32_to_cpu(statistics->general.beacon_silence_rssi_b);
 578         statis.beacon_silence_rssi_c =
 579                         le32_to_cpu(statistics->general.beacon_silence_rssi_c);
 580         statis.beacon_energy_a =
 581                         le32_to_cpu(statistics->general.beacon_energy_a);
 582         statis.beacon_energy_b =
 583                         le32_to_cpu(statistics->general.beacon_energy_b);
 584         statis.beacon_energy_c =
 585                         le32_to_cpu(statistics->general.beacon_energy_c);
 586
 587         spin_unlock_irqrestore(&priv->lock, flags);
 588
 589         IWL_DEBUG_CALIB("rx_enable_time = %u usecs\n", rx_enable_time);
 590
 591         if (!rx_enable_time) {
 592                 IWL_DEBUG_CALIB("<< RX Enable Time == 0! \n");
 593                 return;
 594         }
 595
 596         /* These statistics increase monotonically, and do not reset
 597          *   at each beacon.  Calculate difference from last value, or just
 598          *   use the new statistics value if it has reset or wrapped around. */
 599         if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
 600                 data->last_bad_plcp_cnt_cck = bad_plcp_cck;
 601         else {
 602                 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
 603                 data->last_bad_plcp_cnt_cck += bad_plcp_cck;
 604         }
 605
 606         if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
 607                 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
 608         else {
 609                 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
 610                 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
 611         }
 612
 613         if (data->last_fa_cnt_ofdm > fa_ofdm)
 614                 data->last_fa_cnt_ofdm = fa_ofdm;
 615         else {
 616                 fa_ofdm -= data->last_fa_cnt_ofdm;
 617                 data->last_fa_cnt_ofdm += fa_ofdm;
 618         }
 619
 620         if (data->last_fa_cnt_cck > fa_cck)
 621                 data->last_fa_cnt_cck = fa_cck;
 622         else {
 623                 fa_cck -= data->last_fa_cnt_cck;
 624                 data->last_fa_cnt_cck += fa_cck;
 625         }
 626
 627         /* Total aborted signal locks */
 628         norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
 629         norm_fa_cck = fa_cck + bad_plcp_cck;
 630
 631         IWL_DEBUG_CALIB("cck: fa %u badp %u  ofdm: fa %u badp %u\n", fa_cck,
 632                         bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
 633
 634         iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
 635         iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
 636         iwl_sensitivity_write(priv);
 637
 638         return;
 639 }
 640 EXPORT_SYMBOL(iwl_sensitivity_calibration);
 641
 642 /*
 643  * Accumulate 20 beacons of signal and noise statistics for each of
 644  *   3 receivers/antennas/rx-chains, then figure out:
 645  * 1)  Which antennas are connected.
 646  * 2)  Differential rx gain settings to balance the 3 receivers.
 647  */
 648 void iwl_chain_noise_calibration(struct iwl_priv *priv,
 649                                  struct iwl_notif_statistics *stat_resp)
 650 {
 651         struct iwl_chain_noise_data *data = NULL;
 652
 653         u32 chain_noise_a;
 654         u32 chain_noise_b;
 655         u32 chain_noise_c;
 656         u32 chain_sig_a;
 657         u32 chain_sig_b;
 658         u32 chain_sig_c;
 659         u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 660         u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 661         u32 max_average_sig;
 662         u16 max_average_sig_antenna_i;
 663         u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
 664         u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
 665         u16 i = 0;
 666         u16 rxon_chnum = INITIALIZATION_VALUE;
 667         u16 stat_chnum = INITIALIZATION_VALUE;
 668         u8 rxon_band24;
 669         u8 stat_band24;
 670         u32 active_chains = 0;
 671         u8 num_tx_chains;
 672         unsigned long flags;
 673         struct statistics_rx_non_phy *rx_info = &(stat_resp->rx.general);
 674
 675         if (priv->disable_chain_noise_cal)
 676                 return;
 677
 678         data = &(priv->chain_noise_data);
 679
 680         /* Accumulate just the first 20 beacons after the first association,
 681          *   then we're done forever. */
 682         if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
 683                 if (data->state == IWL_CHAIN_NOISE_ALIVE)
 684                         IWL_DEBUG_CALIB("Wait for noise calib reset\n");
 685                 return;
 686         }
 687
 688         spin_lock_irqsave(&priv->lock, flags);
 689         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 690                 IWL_DEBUG_CALIB(" << Interference data unavailable\n");
 691                 spin_unlock_irqrestore(&priv->lock, flags);
 692                 return;
 693         }
 694
 695         rxon_band24 = !!(priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK);
 696         rxon_chnum = le16_to_cpu(priv->staging_rxon.channel);
 697         stat_band24 = !!(stat_resp->flag & STATISTICS_REPLY_FLG_BAND_24G_MSK);
 698         stat_chnum = le32_to_cpu(stat_resp->flag) >> 16;
 699
 700         /* Make sure we accumulate data for just the associated channel
 701          *   (even if scanning). */
 702         if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
 703                 IWL_DEBUG_CALIB("Stats not from chan=%d, band24=%d\n",
 704                                 rxon_chnum, rxon_band24);
 705                 spin_unlock_irqrestore(&priv->lock, flags);
 706                 return;
 707         }
 708
 709         /* Accumulate beacon statistics values across 20 beacons */
 710         chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
 711                                 IN_BAND_FILTER;
 712         chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
 713                                 IN_BAND_FILTER;
 714         chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
 715                                 IN_BAND_FILTER;
 716
 717         chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
 718         chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
 719         chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
 720
 721         spin_unlock_irqrestore(&priv->lock, flags);
 722
 723         data->beacon_count++;
 724
 725         data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
 726         data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
 727         data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
 728
 729         data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
 730         data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
 731         data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
 732
 733         IWL_DEBUG_CALIB("chan=%d, band24=%d, beacon=%d\n",
 734                         rxon_chnum, rxon_band24, data->beacon_count);
 735         IWL_DEBUG_CALIB("chain_sig: a %d b %d c %d\n",
 736                         chain_sig_a, chain_sig_b, chain_sig_c);
 737         IWL_DEBUG_CALIB("chain_noise: a %d b %d c %d\n",
 738                         chain_noise_a, chain_noise_b, chain_noise_c);
 739
 740         /* If this is the 20th beacon, determine:
 741          * 1)  Disconnected antennas (using signal strengths)
 742          * 2)  Differential gain (using silence noise) to balance receivers */
 743         if (data->beacon_count != CAL_NUM_OF_BEACONS)
 744                 return;
 745
 746         /* Analyze signal for disconnected antenna */
 747         average_sig[0] = (data->chain_signal_a) / CAL_NUM_OF_BEACONS;
 748         average_sig[1] = (data->chain_signal_b) / CAL_NUM_OF_BEACONS;
 749         average_sig[2] = (data->chain_signal_c) / CAL_NUM_OF_BEACONS;
 750
 751         if (average_sig[0] >= average_sig[1]) {
 752                 max_average_sig = average_sig[0];
 753                 max_average_sig_antenna_i = 0;
 754                 active_chains = (1 << max_average_sig_antenna_i);
 755         } else {
 756                 max_average_sig = average_sig[1];
 757                 max_average_sig_antenna_i = 1;
 758                 active_chains = (1 << max_average_sig_antenna_i);
 759         }
 760
 761         if (average_sig[2] >= max_average_sig) {
 762                 max_average_sig = average_sig[2];
 763                 max_average_sig_antenna_i = 2;
 764                 active_chains = (1 << max_average_sig_antenna_i);
 765         }
 766
 767         IWL_DEBUG_CALIB("average_sig: a %d b %d c %d\n",
 768                      average_sig[0], average_sig[1], average_sig[2]);
 769         IWL_DEBUG_CALIB("max_average_sig = %d, antenna %d\n",
 770                      max_average_sig, max_average_sig_antenna_i);
 771
 772         /* Compare signal strengths for all 3 receivers. */
 773         for (i = 0; i < NUM_RX_CHAINS; i++) {
 774                 if (i != max_average_sig_antenna_i) {
 775                         s32 rssi_delta = (max_average_sig - average_sig[i]);
 776
 777                         /* If signal is very weak, compared with
 778                          * strongest, mark it as disconnected. */
 779                         if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
 780                                 data->disconn_array[i] = 1;
 781                         else
 782                                 active_chains |= (1 << i);
 783                         IWL_DEBUG_CALIB("i = %d  rssiDelta = %d  "
 784                              "disconn_array[i] = %d\n",
 785                              i, rssi_delta, data->disconn_array[i]);
 786                 }
 787         }
 788
 789         num_tx_chains = 0;
 790         for (i = 0; i < NUM_RX_CHAINS; i++) {
 791                 /* loops on all the bits of
 792                  * priv->hw_setting.valid_tx_ant */
 793                 u8 ant_msk = (1 << i);
 794                 if (!(priv->hw_params.valid_tx_ant & ant_msk))
 795                         continue;
 796
 797                 num_tx_chains++;
 798                 if (data->disconn_array[i] == 0)
 799                         /* there is a Tx antenna connected */
 800                         break;
 801                 if (num_tx_chains == priv->hw_params.tx_chains_num &&
 802                 data->disconn_array[i]) {
 803                         /* This is the last TX antenna and is also
 804                          * disconnected connect it anyway */
 805                         data->disconn_array[i] = 0;
 806                         active_chains |= ant_msk;
 807                         IWL_DEBUG_CALIB("All Tx chains are disconnected W/A - "
 808                                 "declare %d as connected\n", i);
 809                         break;
 810                 }
 811         }
 812
 813         /* Save for use within RXON, TX, SCAN commands, etc. */
 814         priv->chain_noise_data.active_chains = active_chains;
 815         IWL_DEBUG_CALIB("active_chains (bitwise) = 0x%x\n",
 816                         active_chains);
 817
 818         /* Analyze noise for rx balance */
 819         average_noise[0] = ((data->chain_noise_a)/CAL_NUM_OF_BEACONS);
 820         average_noise[1] = ((data->chain_noise_b)/CAL_NUM_OF_BEACONS);
 821         average_noise[2] = ((data->chain_noise_c)/CAL_NUM_OF_BEACONS);
 822
 823         for (i = 0; i < NUM_RX_CHAINS; i++) {
 824                 if (!(data->disconn_array[i]) &&
 825                    (average_noise[i] <= min_average_noise)) {
 826                         /* This means that chain i is active and has
 827                          * lower noise values so far: */
 828                         min_average_noise = average_noise[i];
 829                         min_average_noise_antenna_i = i;
 830                 }
 831         }
 832
 833         IWL_DEBUG_CALIB("average_noise: a %d b %d c %d\n",
 834                         average_noise[0], average_noise[1],
 835                         average_noise[2]);
 836
 837         IWL_DEBUG_CALIB("min_average_noise = %d, antenna %d\n",
 838                         min_average_noise, min_average_noise_antenna_i);
 839
 840         priv->cfg->ops->utils->gain_computation(priv, average_noise,
 841                 min_average_noise_antenna_i, min_average_noise);
 842
 843         /* Some power changes may have been made during the calibration.
 844          * Update and commit the RXON
 845          */
 846         if (priv->cfg->ops->lib->update_chain_flags)
 847                 priv->cfg->ops->lib->update_chain_flags(priv);
 848
 849         data->state = IWL_CHAIN_NOISE_DONE;
 850         iwl_power_enable_management(priv);
 851 }
 852 EXPORT_SYMBOL(iwl_chain_noise_calibration);
 853
 854
 855 void iwl_reset_run_time_calib(struct iwl_priv *priv)
 856 {
 857         int i;
 858         memset(&(priv->sensitivity_data), 0,
 859                sizeof(struct iwl_sensitivity_data));
 860         memset(&(priv->chain_noise_data), 0,
 861                sizeof(struct iwl_chain_noise_data));
 862         for (i = 0; i < NUM_RX_CHAINS; i++)
 863                 priv->chain_noise_data.delta_gain_code[i] =
 864                                 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
 865
 866         /* Ask for statistics now, the uCode will send notification
 867          * periodically after association */
 868         iwl_send_statistics_request(priv, CMD_ASYNC);
 869 }
 870 EXPORT_SYMBOL(iwl_reset_run_time_calib);
 871