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