git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/iwlwifi/iwl-calib.c

   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 - 2009 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
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  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
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  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
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  25  * in the file called LICENSE.GPL.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2005 - 2009 Intel Corporation. All rights reserved.
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  41  *    notice, this list of conditions and the following disclaimer.
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  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
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  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 struct statistics_general_data {
  74         u32 beacon_silence_rssi_a;
  75         u32 beacon_silence_rssi_b;
  76         u32 beacon_silence_rssi_c;
  77         u32 beacon_energy_a;
  78         u32 beacon_energy_b;
  79         u32 beacon_energy_c;
  80 };
  81
  82 int iwl_send_calib_results(struct iwl_priv *priv)
  83 {
  84         int ret = 0;
  85         int i = 0;
  86
  87         struct iwl_host_cmd hcmd = {
  88                 .id = REPLY_PHY_CALIBRATION_CMD,
  89                 .meta.flags = CMD_SIZE_HUGE,
  90         };
  91
  92         for (i = 0; i < IWL_CALIB_MAX; i++) {
  93                 if ((BIT(i) & priv->hw_params.calib_init_cfg) &&
  94                     priv->calib_results[i].buf) {
  95                         hcmd.len = priv->calib_results[i].buf_len;
  96                         hcmd.data = priv->calib_results[i].buf;
  97                         ret = iwl_send_cmd_sync(priv, &hcmd);
  98                         if (ret)
  99                                 goto err;
 100                 }
 101         }
 102
 103         return 0;
 104 err:
 105         IWL_ERR(priv, "Error %d iteration %d\n", ret, i);
 106         return ret;
 107 }
 108 EXPORT_SYMBOL(iwl_send_calib_results);
 109
 110 int iwl_calib_set(struct iwl_calib_result *res, const u8 *buf, int len)
 111 {
 112         if (res->buf_len != len) {
 113                 kfree(res->buf);
 114                 res->buf = kzalloc(len, GFP_ATOMIC);
 115         }
 116         if (unlikely(res->buf == NULL))
 117                 return -ENOMEM;
 118
 119         res->buf_len = len;
 120         memcpy(res->buf, buf, len);
 121         return 0;
 122 }
 123 EXPORT_SYMBOL(iwl_calib_set);
 124
 125 void iwl_calib_free_results(struct iwl_priv *priv)
 126 {
 127         int i;
 128
 129         for (i = 0; i < IWL_CALIB_MAX; i++) {
 130                 kfree(priv->calib_results[i].buf);
 131                 priv->calib_results[i].buf = NULL;
 132                 priv->calib_results[i].buf_len = 0;
 133         }
 134 }
 135
 136 /*****************************************************************************
 137  * RUNTIME calibrations framework
 138  *****************************************************************************/
 139
 140 /* "false alarms" are signals that our DSP tries to lock onto,
 141  *   but then determines that they are either noise, or transmissions
 142  *   from a distant wireless network (also "noise", really) that get
 143  *   "stepped on" by stronger transmissions within our own network.
 144  * This algorithm attempts to set a sensitivity level that is high
 145  *   enough to receive all of our own network traffic, but not so
 146  *   high that our DSP gets too busy trying to lock onto non-network
 147  *   activity/noise. */
 148 static int iwl_sens_energy_cck(struct iwl_priv *priv,
 149                                    u32 norm_fa,
 150                                    u32 rx_enable_time,
 151                                    struct statistics_general_data *rx_info)
 152 {
 153         u32 max_nrg_cck = 0;
 154         int i = 0;
 155         u8 max_silence_rssi = 0;
 156         u32 silence_ref = 0;
 157         u8 silence_rssi_a = 0;
 158         u8 silence_rssi_b = 0;
 159         u8 silence_rssi_c = 0;
 160         u32 val;
 161
 162         /* "false_alarms" values below are cross-multiplications to assess the
 163          *   numbers of false alarms within the measured period of actual Rx
 164          *   (Rx is off when we're txing), vs the min/max expected false alarms
 165          *   (some should be expected if rx is sensitive enough) in a
 166          *   hypothetical listening period of 200 time units (TU), 204.8 msec:
 167          *
 168          * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
 169          *
 170          * */
 171         u32 false_alarms = norm_fa * 200 * 1024;
 172         u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
 173         u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
 174         struct iwl_sensitivity_data *data = NULL;
 175         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 176
 177         data = &(priv->sensitivity_data);
 178
 179         data->nrg_auto_corr_silence_diff = 0;
 180
 181         /* Find max silence rssi among all 3 receivers.
 182          * This is background noise, which may include transmissions from other
 183          *    networks, measured during silence before our network's beacon */
 184         silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
 185                             ALL_BAND_FILTER) >> 8);
 186         silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
 187                             ALL_BAND_FILTER) >> 8);
 188         silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
 189                             ALL_BAND_FILTER) >> 8);
 190
 191         val = max(silence_rssi_b, silence_rssi_c);
 192         max_silence_rssi = max(silence_rssi_a, (u8) val);
 193
 194         /* Store silence rssi in 20-beacon history table */
 195         data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
 196         data->nrg_silence_idx++;
 197         if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
 198                 data->nrg_silence_idx = 0;
 199
 200         /* Find max silence rssi across 20 beacon history */
 201         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
 202                 val = data->nrg_silence_rssi[i];
 203                 silence_ref = max(silence_ref, val);
 204         }
 205         IWL_DEBUG_CALIB(priv, "silence a %u, b %u, c %u, 20-bcn max %u\n",
 206                         silence_rssi_a, silence_rssi_b, silence_rssi_c,
 207                         silence_ref);
 208
 209         /* Find max rx energy (min value!) among all 3 receivers,
 210          *   measured during beacon frame.
 211          * Save it in 10-beacon history table. */
 212         i = data->nrg_energy_idx;
 213         val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
 214         data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
 215
 216         data->nrg_energy_idx++;
 217         if (data->nrg_energy_idx >= 10)
 218                 data->nrg_energy_idx = 0;
 219
 220         /* Find min rx energy (max value) across 10 beacon history.
 221          * This is the minimum signal level that we want to receive well.
 222          * Add backoff (margin so we don't miss slightly lower energy frames).
 223          * This establishes an upper bound (min value) for energy threshold. */
 224         max_nrg_cck = data->nrg_value[0];
 225         for (i = 1; i < 10; i++)
 226                 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
 227         max_nrg_cck += 6;
 228
 229         IWL_DEBUG_CALIB(priv, "rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
 230                         rx_info->beacon_energy_a, rx_info->beacon_energy_b,
 231                         rx_info->beacon_energy_c, max_nrg_cck - 6);
 232
 233         /* Count number of consecutive beacons with fewer-than-desired
 234          *   false alarms. */
 235         if (false_alarms < min_false_alarms)
 236                 data->num_in_cck_no_fa++;
 237         else
 238                 data->num_in_cck_no_fa = 0;
 239         IWL_DEBUG_CALIB(priv, "consecutive bcns with few false alarms = %u\n",
 240                         data->num_in_cck_no_fa);
 241
 242         /* If we got too many false alarms this time, reduce sensitivity */
 243         if ((false_alarms > max_false_alarms) &&
 244                 (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {
 245                 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u\n",
 246                      false_alarms, max_false_alarms);
 247                 IWL_DEBUG_CALIB(priv, "... reducing sensitivity\n");
 248                 data->nrg_curr_state = IWL_FA_TOO_MANY;
 249                 /* Store for "fewer than desired" on later beacon */
 250                 data->nrg_silence_ref = silence_ref;
 251
 252                 /* increase energy threshold (reduce nrg value)
 253                  *   to decrease sensitivity */
 254                 if (data->nrg_th_cck >
 255                         (ranges->max_nrg_cck + NRG_STEP_CCK))
 256                         data->nrg_th_cck = data->nrg_th_cck
 257                                                  - NRG_STEP_CCK;
 258                 else
 259                         data->nrg_th_cck = ranges->max_nrg_cck;
 260         /* Else if we got fewer than desired, increase sensitivity */
 261         } else if (false_alarms < min_false_alarms) {
 262                 data->nrg_curr_state = IWL_FA_TOO_FEW;
 263
 264                 /* Compare silence level with silence level for most recent
 265                  *   healthy number or too many false alarms */
 266                 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
 267                                                    (s32)silence_ref;
 268
 269                 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u, silence diff %d\n",
 270                          false_alarms, min_false_alarms,
 271                          data->nrg_auto_corr_silence_diff);
 272
 273                 /* Increase value to increase sensitivity, but only if:
 274                  * 1a) previous beacon did *not* have *too many* false alarms
 275                  * 1b) AND there's a significant difference in Rx levels
 276                  *      from a previous beacon with too many, or healthy # FAs
 277                  * OR 2) We've seen a lot of beacons (100) with too few
 278                  *       false alarms */
 279                 if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
 280                         ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 281                         (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 282
 283                         IWL_DEBUG_CALIB(priv, "... increasing sensitivity\n");
 284                         /* Increase nrg value to increase sensitivity */
 285                         val = data->nrg_th_cck + NRG_STEP_CCK;
 286                         data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
 287                 } else {
 288                         IWL_DEBUG_CALIB(priv, "... but not changing sensitivity\n");
 289                 }
 290
 291         /* Else we got a healthy number of false alarms, keep status quo */
 292         } else {
 293                 IWL_DEBUG_CALIB(priv, " FA in safe zone\n");
 294                 data->nrg_curr_state = IWL_FA_GOOD_RANGE;
 295
 296                 /* Store for use in "fewer than desired" with later beacon */
 297                 data->nrg_silence_ref = silence_ref;
 298
 299                 /* If previous beacon had too many false alarms,
 300                  *   give it some extra margin by reducing sensitivity again
 301                  *   (but don't go below measured energy of desired Rx) */
 302                 if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
 303                         IWL_DEBUG_CALIB(priv, "... increasing margin\n");
 304                         if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
 305                                 data->nrg_th_cck -= NRG_MARGIN;
 306                         else
 307                                 data->nrg_th_cck = max_nrg_cck;
 308                 }
 309         }
 310
 311         /* Make sure the energy threshold does not go above the measured
 312          * energy of the desired Rx signals (reduced by backoff margin),
 313          * or else we might start missing Rx frames.
 314          * Lower value is higher energy, so we use max()!
 315          */
 316         data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
 317         IWL_DEBUG_CALIB(priv, "new nrg_th_cck %u\n", data->nrg_th_cck);
 318
 319         data->nrg_prev_state = data->nrg_curr_state;
 320
 321         /* Auto-correlation CCK algorithm */
 322         if (false_alarms > min_false_alarms) {
 323
 324                 /* increase auto_corr values to decrease sensitivity
 325                  * so the DSP won't be disturbed by the noise
 326                  */
 327                 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
 328                         data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
 329                 else {
 330                         val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
 331                         data->auto_corr_cck =
 332                                 min((u32)ranges->auto_corr_max_cck, val);
 333                 }
 334                 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
 335                 data->auto_corr_cck_mrc =
 336                         min((u32)ranges->auto_corr_max_cck_mrc, val);
 337         } else if ((false_alarms < min_false_alarms) &&
 338            ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 339            (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 340
 341                 /* Decrease auto_corr values to increase sensitivity */
 342                 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
 343                 data->auto_corr_cck =
 344                         max((u32)ranges->auto_corr_min_cck, val);
 345                 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
 346                 data->auto_corr_cck_mrc =
 347                         max((u32)ranges->auto_corr_min_cck_mrc, val);
 348         }
 349
 350         return 0;
 351 }
 352
 353
 354 static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,
 355                                        u32 norm_fa,
 356                                        u32 rx_enable_time)
 357 {
 358         u32 val;
 359         u32 false_alarms = norm_fa * 200 * 1024;
 360         u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
 361         u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
 362         struct iwl_sensitivity_data *data = NULL;
 363         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 364
 365         data = &(priv->sensitivity_data);
 366
 367         /* If we got too many false alarms this time, reduce sensitivity */
 368         if (false_alarms > max_false_alarms) {
 369
 370                 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u)\n",
 371                              false_alarms, max_false_alarms);
 372
 373                 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
 374                 data->auto_corr_ofdm =
 375                         min((u32)ranges->auto_corr_max_ofdm, val);
 376
 377                 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
 378                 data->auto_corr_ofdm_mrc =
 379                         min((u32)ranges->auto_corr_max_ofdm_mrc, val);
 380
 381                 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
 382                 data->auto_corr_ofdm_x1 =
 383                         min((u32)ranges->auto_corr_max_ofdm_x1, val);
 384
 385                 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
 386                 data->auto_corr_ofdm_mrc_x1 =
 387                         min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
 388         }
 389
 390         /* Else if we got fewer than desired, increase sensitivity */
 391         else if (false_alarms < min_false_alarms) {
 392
 393                 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u\n",
 394                              false_alarms, min_false_alarms);
 395
 396                 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
 397                 data->auto_corr_ofdm =
 398                         max((u32)ranges->auto_corr_min_ofdm, val);
 399
 400                 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
 401                 data->auto_corr_ofdm_mrc =
 402                         max((u32)ranges->auto_corr_min_ofdm_mrc, val);
 403
 404                 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
 405                 data->auto_corr_ofdm_x1 =
 406                         max((u32)ranges->auto_corr_min_ofdm_x1, val);
 407
 408                 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
 409                 data->auto_corr_ofdm_mrc_x1 =
 410                         max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
 411         } else {
 412                 IWL_DEBUG_CALIB(priv, "min FA %u < norm FA %u < max FA %u OK\n",
 413                          min_false_alarms, false_alarms, max_false_alarms);
 414         }
 415         return 0;
 416 }
 417
 418 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
 419 static int iwl_sensitivity_write(struct iwl_priv *priv)
 420 {
 421         int ret = 0;
 422         struct iwl_sensitivity_cmd cmd ;
 423         struct iwl_sensitivity_data *data = NULL;
 424         struct iwl_host_cmd cmd_out = {
 425                 .id = SENSITIVITY_CMD,
 426                 .len = sizeof(struct iwl_sensitivity_cmd),
 427                 .meta.flags = CMD_ASYNC,
 428                 .data = &cmd,
 429         };
 430
 431         data = &(priv->sensitivity_data);
 432
 433         memset(&cmd, 0, sizeof(cmd));
 434
 435         cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
 436                                 cpu_to_le16((u16)data->auto_corr_ofdm);
 437         cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
 438                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
 439         cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
 440                                 cpu_to_le16((u16)data->auto_corr_ofdm_x1);
 441         cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
 442                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
 443
 444         cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
 445                                 cpu_to_le16((u16)data->auto_corr_cck);
 446         cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
 447                                 cpu_to_le16((u16)data->auto_corr_cck_mrc);
 448
 449         cmd.table[HD_MIN_ENERGY_CCK_DET_INDEX] =
 450                                 cpu_to_le16((u16)data->nrg_th_cck);
 451         cmd.table[HD_MIN_ENERGY_OFDM_DET_INDEX] =
 452                                 cpu_to_le16((u16)data->nrg_th_ofdm);
 453
 454         cmd.table[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
 455                                 cpu_to_le16(190);
 456         cmd.table[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
 457                                 cpu_to_le16(390);
 458         cmd.table[HD_OFDM_ENERGY_TH_IN_INDEX] =
 459                                 cpu_to_le16(62);
 460
 461         IWL_DEBUG_CALIB(priv, "ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
 462                         data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
 463                         data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
 464                         data->nrg_th_ofdm);
 465
 466         IWL_DEBUG_CALIB(priv, "cck: ac %u mrc %u thresh %u\n",
 467                         data->auto_corr_cck, data->auto_corr_cck_mrc,
 468                         data->nrg_th_cck);
 469
 470         /* Update uCode's "work" table, and copy it to DSP */
 471         cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
 472
 473         /* Don't send command to uCode if nothing has changed */
 474         if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
 475                     sizeof(u16)*HD_TABLE_SIZE)) {
 476                 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
 477                 return 0;
 478         }
 479
 480         /* Copy table for comparison next time */
 481         memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
 482                sizeof(u16)*HD_TABLE_SIZE);
 483
 484         ret = iwl_send_cmd(priv, &cmd_out);
 485         if (ret)
 486                 IWL_ERR(priv, "SENSITIVITY_CMD failed\n");
 487
 488         return ret;
 489 }
 490
 491 void iwl_init_sensitivity(struct iwl_priv *priv)
 492 {
 493         int ret = 0;
 494         int i;
 495         struct iwl_sensitivity_data *data = NULL;
 496         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 497
 498         if (priv->disable_sens_cal)
 499                 return;
 500
 501         IWL_DEBUG_CALIB(priv, "Start iwl_init_sensitivity\n");
 502
 503         /* Clear driver's sensitivity algo data */
 504         data = &(priv->sensitivity_data);
 505
 506         if (ranges == NULL)
 507                 return;
 508
 509         memset(data, 0, sizeof(struct iwl_sensitivity_data));
 510
 511         data->num_in_cck_no_fa = 0;
 512         data->nrg_curr_state = IWL_FA_TOO_MANY;
 513         data->nrg_prev_state = IWL_FA_TOO_MANY;
 514         data->nrg_silence_ref = 0;
 515         data->nrg_silence_idx = 0;
 516         data->nrg_energy_idx = 0;
 517
 518         for (i = 0; i < 10; i++)
 519                 data->nrg_value[i] = 0;
 520
 521         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
 522                 data->nrg_silence_rssi[i] = 0;
 523
 524         data->auto_corr_ofdm = 90;
 525         data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
 526         data->auto_corr_ofdm_x1  = ranges->auto_corr_min_ofdm_x1;
 527         data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
 528         data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
 529         data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
 530         data->nrg_th_cck = ranges->nrg_th_cck;
 531         data->nrg_th_ofdm = ranges->nrg_th_ofdm;
 532
 533         data->last_bad_plcp_cnt_ofdm = 0;
 534         data->last_fa_cnt_ofdm = 0;
 535         data->last_bad_plcp_cnt_cck = 0;
 536         data->last_fa_cnt_cck = 0;
 537
 538         ret |= iwl_sensitivity_write(priv);
 539         IWL_DEBUG_CALIB(priv, "<<return 0x%X\n", ret);
 540 }
 541 EXPORT_SYMBOL(iwl_init_sensitivity);
 542
 543 void iwl_sensitivity_calibration(struct iwl_priv *priv,
 544                                     struct iwl_notif_statistics *resp)
 545 {
 546         u32 rx_enable_time;
 547         u32 fa_cck;
 548         u32 fa_ofdm;
 549         u32 bad_plcp_cck;
 550         u32 bad_plcp_ofdm;
 551         u32 norm_fa_ofdm;
 552         u32 norm_fa_cck;
 553         struct iwl_sensitivity_data *data = NULL;
 554         struct statistics_rx_non_phy *rx_info = &(resp->rx.general);
 555         struct statistics_rx *statistics = &(resp->rx);
 556         unsigned long flags;
 557         struct statistics_general_data statis;
 558
 559         if (priv->disable_sens_cal)
 560                 return;
 561
 562         data = &(priv->sensitivity_data);
 563
 564         if (!iwl_is_associated(priv)) {
 565                 IWL_DEBUG_CALIB(priv, "<< - not associated\n");
 566                 return;
 567         }
 568
 569         spin_lock_irqsave(&priv->lock, flags);
 570         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 571                 IWL_DEBUG_CALIB(priv, "<< invalid data.\n");
 572                 spin_unlock_irqrestore(&priv->lock, flags);
 573                 return;
 574         }
 575
 576         /* Extract Statistics: */
 577         rx_enable_time = le32_to_cpu(rx_info->channel_load);
 578         fa_cck = le32_to_cpu(statistics->cck.false_alarm_cnt);
 579         fa_ofdm = le32_to_cpu(statistics->ofdm.false_alarm_cnt);
 580         bad_plcp_cck = le32_to_cpu(statistics->cck.plcp_err);
 581         bad_plcp_ofdm = le32_to_cpu(statistics->ofdm.plcp_err);
 582
 583         statis.beacon_silence_rssi_a =
 584                         le32_to_cpu(statistics->general.beacon_silence_rssi_a);
 585         statis.beacon_silence_rssi_b =
 586                         le32_to_cpu(statistics->general.beacon_silence_rssi_b);
 587         statis.beacon_silence_rssi_c =
 588                         le32_to_cpu(statistics->general.beacon_silence_rssi_c);
 589         statis.beacon_energy_a =
 590                         le32_to_cpu(statistics->general.beacon_energy_a);
 591         statis.beacon_energy_b =
 592                         le32_to_cpu(statistics->general.beacon_energy_b);
 593         statis.beacon_energy_c =
 594                         le32_to_cpu(statistics->general.beacon_energy_c);
 595
 596         spin_unlock_irqrestore(&priv->lock, flags);
 597
 598         IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time);
 599
 600         if (!rx_enable_time) {
 601                 IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0! \n");
 602                 return;
 603         }
 604
 605         /* These statistics increase monotonically, and do not reset
 606          *   at each beacon.  Calculate difference from last value, or just
 607          *   use the new statistics value if it has reset or wrapped around. */
 608         if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
 609                 data->last_bad_plcp_cnt_cck = bad_plcp_cck;
 610         else {
 611                 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
 612                 data->last_bad_plcp_cnt_cck += bad_plcp_cck;
 613         }
 614
 615         if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
 616                 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
 617         else {
 618                 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
 619                 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
 620         }
 621
 622         if (data->last_fa_cnt_ofdm > fa_ofdm)
 623                 data->last_fa_cnt_ofdm = fa_ofdm;
 624         else {
 625                 fa_ofdm -= data->last_fa_cnt_ofdm;
 626                 data->last_fa_cnt_ofdm += fa_ofdm;
 627         }
 628
 629         if (data->last_fa_cnt_cck > fa_cck)
 630                 data->last_fa_cnt_cck = fa_cck;
 631         else {
 632                 fa_cck -= data->last_fa_cnt_cck;
 633                 data->last_fa_cnt_cck += fa_cck;
 634         }
 635
 636         /* Total aborted signal locks */
 637         norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
 638         norm_fa_cck = fa_cck + bad_plcp_cck;
 639
 640         IWL_DEBUG_CALIB(priv, "cck: fa %u badp %u  ofdm: fa %u badp %u\n", fa_cck,
 641                         bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
 642
 643         iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
 644         iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
 645         iwl_sensitivity_write(priv);
 646
 647         return;
 648 }
 649 EXPORT_SYMBOL(iwl_sensitivity_calibration);
 650
 651 /*
 652  * Accumulate 20 beacons of signal and noise statistics for each of
 653  *   3 receivers/antennas/rx-chains, then figure out:
 654  * 1)  Which antennas are connected.
 655  * 2)  Differential rx gain settings to balance the 3 receivers.
 656  */
 657 void iwl_chain_noise_calibration(struct iwl_priv *priv,
 658                                  struct iwl_notif_statistics *stat_resp)
 659 {
 660         struct iwl_chain_noise_data *data = NULL;
 661
 662         u32 chain_noise_a;
 663         u32 chain_noise_b;
 664         u32 chain_noise_c;
 665         u32 chain_sig_a;
 666         u32 chain_sig_b;
 667         u32 chain_sig_c;
 668         u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 669         u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 670         u32 max_average_sig;
 671         u16 max_average_sig_antenna_i;
 672         u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
 673         u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
 674         u16 i = 0;
 675         u16 rxon_chnum = INITIALIZATION_VALUE;
 676         u16 stat_chnum = INITIALIZATION_VALUE;
 677         u8 rxon_band24;
 678         u8 stat_band24;
 679         u32 active_chains = 0;
 680         u8 num_tx_chains;
 681         unsigned long flags;
 682         struct statistics_rx_non_phy *rx_info = &(stat_resp->rx.general);
 683
 684         if (priv->disable_chain_noise_cal)
 685                 return;
 686
 687         data = &(priv->chain_noise_data);
 688
 689         /* Accumulate just the first 20 beacons after the first association,
 690          *   then we're done forever. */
 691         if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
 692                 if (data->state == IWL_CHAIN_NOISE_ALIVE)
 693                         IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n");
 694                 return;
 695         }
 696
 697         spin_lock_irqsave(&priv->lock, flags);
 698         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 699                 IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n");
 700                 spin_unlock_irqrestore(&priv->lock, flags);
 701                 return;
 702         }
 703
 704         rxon_band24 = !!(priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK);
 705         rxon_chnum = le16_to_cpu(priv->staging_rxon.channel);
 706         stat_band24 = !!(stat_resp->flag & STATISTICS_REPLY_FLG_BAND_24G_MSK);
 707         stat_chnum = le32_to_cpu(stat_resp->flag) >> 16;
 708
 709         /* Make sure we accumulate data for just the associated channel
 710          *   (even if scanning). */
 711         if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
 712                 IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n",
 713                                 rxon_chnum, rxon_band24);
 714                 spin_unlock_irqrestore(&priv->lock, flags);
 715                 return;
 716         }
 717
 718         /* Accumulate beacon statistics values across 20 beacons */
 719         chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
 720                                 IN_BAND_FILTER;
 721         chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
 722                                 IN_BAND_FILTER;
 723         chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
 724                                 IN_BAND_FILTER;
 725
 726         chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
 727         chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
 728         chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
 729
 730         spin_unlock_irqrestore(&priv->lock, flags);
 731
 732         data->beacon_count++;
 733
 734         data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
 735         data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
 736         data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
 737
 738         data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
 739         data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
 740         data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
 741
 742         IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n",
 743                         rxon_chnum, rxon_band24, data->beacon_count);
 744         IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n",
 745                         chain_sig_a, chain_sig_b, chain_sig_c);
 746         IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n",
 747                         chain_noise_a, chain_noise_b, chain_noise_c);
 748
 749         /* If this is the 20th beacon, determine:
 750          * 1)  Disconnected antennas (using signal strengths)
 751          * 2)  Differential gain (using silence noise) to balance receivers */
 752         if (data->beacon_count != CAL_NUM_OF_BEACONS)
 753                 return;
 754
 755         /* Analyze signal for disconnected antenna */
 756         average_sig[0] = (data->chain_signal_a) / CAL_NUM_OF_BEACONS;
 757         average_sig[1] = (data->chain_signal_b) / CAL_NUM_OF_BEACONS;
 758         average_sig[2] = (data->chain_signal_c) / CAL_NUM_OF_BEACONS;
 759
 760         if (average_sig[0] >= average_sig[1]) {
 761                 max_average_sig = average_sig[0];
 762                 max_average_sig_antenna_i = 0;
 763                 active_chains = (1 << max_average_sig_antenna_i);
 764         } else {
 765                 max_average_sig = average_sig[1];
 766                 max_average_sig_antenna_i = 1;
 767                 active_chains = (1 << max_average_sig_antenna_i);
 768         }
 769
 770         if (average_sig[2] >= max_average_sig) {
 771                 max_average_sig = average_sig[2];
 772                 max_average_sig_antenna_i = 2;
 773                 active_chains = (1 << max_average_sig_antenna_i);
 774         }
 775
 776         IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n",
 777                      average_sig[0], average_sig[1], average_sig[2]);
 778         IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n",
 779                      max_average_sig, max_average_sig_antenna_i);
 780
 781         /* Compare signal strengths for all 3 receivers. */
 782         for (i = 0; i < NUM_RX_CHAINS; i++) {
 783                 if (i != max_average_sig_antenna_i) {
 784                         s32 rssi_delta = (max_average_sig - average_sig[i]);
 785
 786                         /* If signal is very weak, compared with
 787                          * strongest, mark it as disconnected. */
 788                         if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
 789                                 data->disconn_array[i] = 1;
 790                         else
 791                                 active_chains |= (1 << i);
 792                         IWL_DEBUG_CALIB(priv, "i = %d  rssiDelta = %d  "
 793                              "disconn_array[i] = %d\n",
 794                              i, rssi_delta, data->disconn_array[i]);
 795                 }
 796         }
 797
 798         num_tx_chains = 0;
 799         for (i = 0; i < NUM_RX_CHAINS; i++) {
 800                 /* loops on all the bits of
 801                  * priv->hw_setting.valid_tx_ant */
 802                 u8 ant_msk = (1 << i);
 803                 if (!(priv->hw_params.valid_tx_ant & ant_msk))
 804                         continue;
 805
 806                 num_tx_chains++;
 807                 if (data->disconn_array[i] == 0)
 808                         /* there is a Tx antenna connected */
 809                         break;
 810                 if (num_tx_chains == priv->hw_params.tx_chains_num &&
 811                 data->disconn_array[i]) {
 812                         /* This is the last TX antenna and is also
 813                          * disconnected connect it anyway */
 814                         data->disconn_array[i] = 0;
 815                         active_chains |= ant_msk;
 816                         IWL_DEBUG_CALIB(priv, "All Tx chains are disconnected W/A - "
 817                                 "declare %d as connected\n", i);
 818                         break;
 819                 }
 820         }
 821
 822         /* Save for use within RXON, TX, SCAN commands, etc. */
 823         priv->chain_noise_data.active_chains = active_chains;
 824         IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",
 825                         active_chains);
 826
 827         /* Analyze noise for rx balance */
 828         average_noise[0] = ((data->chain_noise_a)/CAL_NUM_OF_BEACONS);
 829         average_noise[1] = ((data->chain_noise_b)/CAL_NUM_OF_BEACONS);
 830         average_noise[2] = ((data->chain_noise_c)/CAL_NUM_OF_BEACONS);
 831
 832         for (i = 0; i < NUM_RX_CHAINS; i++) {
 833                 if (!(data->disconn_array[i]) &&
 834                    (average_noise[i] <= min_average_noise)) {
 835                         /* This means that chain i is active and has
 836                          * lower noise values so far: */
 837                         min_average_noise = average_noise[i];
 838                         min_average_noise_antenna_i = i;
 839                 }
 840         }
 841
 842         IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n",
 843                         average_noise[0], average_noise[1],
 844                         average_noise[2]);
 845
 846         IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n",
 847                         min_average_noise, min_average_noise_antenna_i);
 848
 849         if (priv->cfg->ops->utils->gain_computation)
 850                 priv->cfg->ops->utils->gain_computation(priv, average_noise,
 851                         min_average_noise_antenna_i, min_average_noise);
 852
 853         /* Some power changes may have been made during the calibration.
 854          * Update and commit the RXON
 855          */
 856         if (priv->cfg->ops->lib->update_chain_flags)
 857                 priv->cfg->ops->lib->update_chain_flags(priv);
 858
 859         data->state = IWL_CHAIN_NOISE_DONE;
 860         iwl_power_enable_management(priv);
 861 }
 862 EXPORT_SYMBOL(iwl_chain_noise_calibration);
 863
 864
 865 void iwl_reset_run_time_calib(struct iwl_priv *priv)
 866 {
 867         int i;
 868         memset(&(priv->sensitivity_data), 0,
 869                sizeof(struct iwl_sensitivity_data));
 870         memset(&(priv->chain_noise_data), 0,
 871                sizeof(struct iwl_chain_noise_data));
 872         for (i = 0; i < NUM_RX_CHAINS; i++)
 873                 priv->chain_noise_data.delta_gain_code[i] =
 874                                 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
 875
 876         /* Ask for statistics now, the uCode will send notification
 877          * periodically after association */
 878         iwl_send_statistics_request(priv, CMD_ASYNC);
 879 }
 880 EXPORT_SYMBOL(iwl_reset_run_time_calib);
 881