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 - 2010 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 - 2010 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 <linux/slab.h> 64#include <net/mac80211.h> 65 66#include "iwl-dev.h" 67#include "iwl-core.h" 68#include "iwl-calib.h" 69 70/***************************************************************************** 71 * INIT calibrations framework 72 *****************************************************************************/ 73 74struct statistics_general_data { 75 u32 beacon_silence_rssi_a; 76 u32 beacon_silence_rssi_b; 77 u32 beacon_silence_rssi_c; 78 u32 beacon_energy_a; 79 u32 beacon_energy_b; 80 u32 beacon_energy_c; 81}; 82 83int iwl_send_calib_results(struct iwl_priv *priv) 84{ 85 int ret = 0; 86 int i = 0; 87 88 struct iwl_host_cmd hcmd = { 89 .id = REPLY_PHY_CALIBRATION_CMD, 90 .flags = CMD_SIZE_HUGE, 91 }; 92 93 for (i = 0; i < IWL_CALIB_MAX; i++) { 94 if ((BIT(i) & priv->hw_params.calib_init_cfg) && 95 priv->calib_results[i].buf) { 96 hcmd.len = priv->calib_results[i].buf_len; 97 hcmd.data = priv->calib_results[i].buf; 98 ret = iwl_send_cmd_sync(priv, &hcmd); 99 if (ret) { 100 IWL_ERR(priv, "Error %d iteration %d\n", 101 ret, i); 102 break; 103 } 104 } 105 } 106 107 return ret; 108} 109 110int 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 124void iwl_calib_free_results(struct iwl_priv *priv) 125{ 126 int i; 127 128 for (i = 0; i < IWL_CALIB_MAX; i++) { 129 kfree(priv->calib_results[i].buf); 130 priv->calib_results[i].buf = NULL; 131 priv->calib_results[i].buf_len = 0; 132 } 133} 134 135/***************************************************************************** 136 * RUNTIME calibrations framework 137 *****************************************************************************/ 138 139/* "false alarms" are signals that our DSP tries to lock onto, 140 * but then determines that they are either noise, or transmissions 141 * from a distant wireless network (also "noise", really) that get 142 * "stepped on" by stronger transmissions within our own network. 143 * This algorithm attempts to set a sensitivity level that is high 144 * enough to receive all of our own network traffic, but not so 145 * high that our DSP gets too busy trying to lock onto non-network 146 * activity/noise. */ 147static int iwl_sens_energy_cck(struct iwl_priv *priv, 148 u32 norm_fa, 149 u32 rx_enable_time, 150 struct statistics_general_data *rx_info) 151{ 152 u32 max_nrg_cck = 0; 153 int i = 0; 154 u8 max_silence_rssi = 0; 155 u32 silence_ref = 0; 156 u8 silence_rssi_a = 0; 157 u8 silence_rssi_b = 0; 158 u8 silence_rssi_c = 0; 159 u32 val; 160 161 /* "false_alarms" values below are cross-multiplications to assess the 162 * numbers of false alarms within the measured period of actual Rx 163 * (Rx is off when we're txing), vs the min/max expected false alarms 164 * (some should be expected if rx is sensitive enough) in a 165 * hypothetical listening period of 200 time units (TU), 204.8 msec: 166 * 167 * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time 168 * 169 * */ 170 u32 false_alarms = norm_fa * 200 * 1024; 171 u32 max_false_alarms = MAX_FA_CCK * rx_enable_time; 172 u32 min_false_alarms = MIN_FA_CCK * rx_enable_time; 173 struct iwl_sensitivity_data *data = NULL; 174 const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens; 175 176 data = &(priv->sensitivity_data); 177 178 data->nrg_auto_corr_silence_diff = 0; 179 180 /* Find max silence rssi among all 3 receivers. 181 * This is background noise, which may include transmissions from other 182 * networks, measured during silence before our network's beacon */ 183 silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a & 184 ALL_BAND_FILTER) >> 8); 185 silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b & 186 ALL_BAND_FILTER) >> 8); 187 silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c & 188 ALL_BAND_FILTER) >> 8); 189 190 val = max(silence_rssi_b, silence_rssi_c); 191 max_silence_rssi = max(silence_rssi_a, (u8) val); 192 193 /* Store silence rssi in 20-beacon history table */ 194 data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi; 195 data->nrg_silence_idx++; 196 if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L) 197 data->nrg_silence_idx = 0; 198 199 /* Find max silence rssi across 20 beacon history */ 200 for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) { 201 val = data->nrg_silence_rssi[i]; 202 silence_ref = max(silence_ref, val); 203 } 204 IWL_DEBUG_CALIB(priv, "silence a %u, b %u, c %u, 20-bcn max %u\n", 205 silence_rssi_a, silence_rssi_b, silence_rssi_c, 206 silence_ref); 207 208 /* Find max rx energy (min value!) among all 3 receivers, 209 * measured during beacon frame. 210 * Save it in 10-beacon history table. */ 211 i = data->nrg_energy_idx; 212 val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c); 213 data->nrg_value[i] = min(rx_info->beacon_energy_a, val); 214 215 data->nrg_energy_idx++; 216 if (data->nrg_energy_idx >= 10) 217 data->nrg_energy_idx = 0; 218 219 /* Find min rx energy (max value) across 10 beacon history. 220 * This is the minimum signal level that we want to receive well. 221 * Add backoff (margin so we don't miss slightly lower energy frames). 222 * This establishes an upper bound (min value) for energy threshold. */ 223 max_nrg_cck = data->nrg_value[0]; 224 for (i = 1; i < 10; i++) 225 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i])); 226 max_nrg_cck += 6; 227 228 IWL_DEBUG_CALIB(priv, "rx energy a %u, b %u, c %u, 10-bcn max/min %u\n", 229 rx_info->beacon_energy_a, rx_info->beacon_energy_b, 230 rx_info->beacon_energy_c, max_nrg_cck - 6); 231 232 /* Count number of consecutive beacons with fewer-than-desired 233 * false alarms. */ 234 if (false_alarms < min_false_alarms) 235 data->num_in_cck_no_fa++; 236 else 237 data->num_in_cck_no_fa = 0; 238 IWL_DEBUG_CALIB(priv, "consecutive bcns with few false alarms = %u\n", 239 data->num_in_cck_no_fa); 240 241 /* If we got too many false alarms this time, reduce sensitivity */ 242 if ((false_alarms > max_false_alarms) && 243 (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) { 244 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u\n", 245 false_alarms, max_false_alarms); 246 IWL_DEBUG_CALIB(priv, "... reducing sensitivity\n"); 247 data->nrg_curr_state = IWL_FA_TOO_MANY; 248 /* Store for "fewer than desired" on later beacon */ 249 data->nrg_silence_ref = silence_ref; 250 251 /* increase energy threshold (reduce nrg value) 252 * to decrease sensitivity */ 253 data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK; 254 /* Else if we got fewer than desired, increase sensitivity */ 255 } else if (false_alarms < min_false_alarms) { 256 data->nrg_curr_state = IWL_FA_TOO_FEW; 257 258 /* Compare silence level with silence level for most recent 259 * healthy number or too many false alarms */ 260 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref - 261 (s32)silence_ref; 262 263 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u, silence diff %d\n", 264 false_alarms, min_false_alarms, 265 data->nrg_auto_corr_silence_diff); 266 267 /* Increase value to increase sensitivity, but only if: 268 * 1a) previous beacon did *not* have *too many* false alarms 269 * 1b) AND there's a significant difference in Rx levels 270 * from a previous beacon with too many, or healthy # FAs 271 * OR 2) We've seen a lot of beacons (100) with too few 272 * false alarms */ 273 if ((data->nrg_prev_state != IWL_FA_TOO_MANY) && 274 ((data->nrg_auto_corr_silence_diff > NRG_DIFF) || 275 (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) { 276 277 IWL_DEBUG_CALIB(priv, "... increasing sensitivity\n"); 278 /* Increase nrg value to increase sensitivity */ 279 val = data->nrg_th_cck + NRG_STEP_CCK; 280 data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val); 281 } else { 282 IWL_DEBUG_CALIB(priv, "... but not changing sensitivity\n"); 283 } 284 285 /* Else we got a healthy number of false alarms, keep status quo */ 286 } else { 287 IWL_DEBUG_CALIB(priv, " FA in safe zone\n"); 288 data->nrg_curr_state = IWL_FA_GOOD_RANGE; 289 290 /* Store for use in "fewer than desired" with later beacon */ 291 data->nrg_silence_ref = silence_ref; 292 293 /* If previous beacon had too many false alarms, 294 * give it some extra margin by reducing sensitivity again 295 * (but don't go below measured energy of desired Rx) */ 296 if (IWL_FA_TOO_MANY == data->nrg_prev_state) { 297 IWL_DEBUG_CALIB(priv, "... increasing margin\n"); 298 if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN)) 299 data->nrg_th_cck -= NRG_MARGIN; 300 else 301 data->nrg_th_cck = max_nrg_cck; 302 } 303 } 304 305 /* Make sure the energy threshold does not go above the measured 306 * energy of the desired Rx signals (reduced by backoff margin), 307 * or else we might start missing Rx frames. 308 * Lower value is higher energy, so we use max()! 309 */ 310 data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck); 311 IWL_DEBUG_CALIB(priv, "new nrg_th_cck %u\n", data->nrg_th_cck); 312 313 data->nrg_prev_state = data->nrg_curr_state; 314 315 /* Auto-correlation CCK algorithm */ 316 if (false_alarms > min_false_alarms) { 317 318 /* increase auto_corr values to decrease sensitivity 319 * so the DSP won't be disturbed by the noise 320 */ 321 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK) 322 data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1; 323 else { 324 val = data->auto_corr_cck + AUTO_CORR_STEP_CCK; 325 data->auto_corr_cck = 326 min((u32)ranges->auto_corr_max_cck, val); 327 } 328 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK; 329 data->auto_corr_cck_mrc = 330 min((u32)ranges->auto_corr_max_cck_mrc, val); 331 } else if ((false_alarms < min_false_alarms) && 332 ((data->nrg_auto_corr_silence_diff > NRG_DIFF) || 333 (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) { 334 335 /* Decrease auto_corr values to increase sensitivity */ 336 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK; 337 data->auto_corr_cck = 338 max((u32)ranges->auto_corr_min_cck, val); 339 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK; 340 data->auto_corr_cck_mrc = 341 max((u32)ranges->auto_corr_min_cck_mrc, val); 342 } 343 344 return 0; 345} 346 347 348static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv, 349 u32 norm_fa, 350 u32 rx_enable_time) 351{ 352 u32 val; 353 u32 false_alarms = norm_fa * 200 * 1024; 354 u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time; 355 u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time; 356 struct iwl_sensitivity_data *data = NULL; 357 const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens; 358 359 data = &(priv->sensitivity_data); 360 361 /* If we got too many false alarms this time, reduce sensitivity */ 362 if (false_alarms > max_false_alarms) { 363 364 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u)\n", 365 false_alarms, max_false_alarms); 366 367 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM; 368 data->auto_corr_ofdm = 369 min((u32)ranges->auto_corr_max_ofdm, val); 370 371 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM; 372 data->auto_corr_ofdm_mrc = 373 min((u32)ranges->auto_corr_max_ofdm_mrc, val); 374 375 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM; 376 data->auto_corr_ofdm_x1 = 377 min((u32)ranges->auto_corr_max_ofdm_x1, val); 378 379 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM; 380 data->auto_corr_ofdm_mrc_x1 = 381 min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val); 382 } 383 384 /* Else if we got fewer than desired, increase sensitivity */ 385 else if (false_alarms < min_false_alarms) { 386 387 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u\n", 388 false_alarms, min_false_alarms); 389 390 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM; 391 data->auto_corr_ofdm = 392 max((u32)ranges->auto_corr_min_ofdm, val); 393 394 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM; 395 data->auto_corr_ofdm_mrc = 396 max((u32)ranges->auto_corr_min_ofdm_mrc, val); 397 398 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM; 399 data->auto_corr_ofdm_x1 = 400 max((u32)ranges->auto_corr_min_ofdm_x1, val); 401 402 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM; 403 data->auto_corr_ofdm_mrc_x1 = 404 max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val); 405 } else { 406 IWL_DEBUG_CALIB(priv, "min FA %u < norm FA %u < max FA %u OK\n", 407 min_false_alarms, false_alarms, max_false_alarms); 408 } 409 return 0; 410} 411 412static void iwl_prepare_legacy_sensitivity_tbl(struct iwl_priv *priv, 413 struct iwl_sensitivity_data *data, 414 __le16 *tbl) 415{ 416 tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] = 417 cpu_to_le16((u16)data->auto_corr_ofdm); 418 tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] = 419 cpu_to_le16((u16)data->auto_corr_ofdm_mrc); 420 tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] = 421 cpu_to_le16((u16)data->auto_corr_ofdm_x1); 422 tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] = 423 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1); 424 425 tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] = 426 cpu_to_le16((u16)data->auto_corr_cck); 427 tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] = 428 cpu_to_le16((u16)data->auto_corr_cck_mrc); 429 430 tbl[HD_MIN_ENERGY_CCK_DET_INDEX] = 431 cpu_to_le16((u16)data->nrg_th_cck); 432 tbl[HD_MIN_ENERGY_OFDM_DET_INDEX] = 433 cpu_to_le16((u16)data->nrg_th_ofdm); 434 435 tbl[HD_BARKER_CORR_TH_ADD_MIN_INDEX] = 436 cpu_to_le16(data->barker_corr_th_min); 437 tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] = 438 cpu_to_le16(data->barker_corr_th_min_mrc); 439 tbl[HD_OFDM_ENERGY_TH_IN_INDEX] = 440 cpu_to_le16(data->nrg_th_cca); 441 442 IWL_DEBUG_CALIB(priv, "ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n", 443 data->auto_corr_ofdm, data->auto_corr_ofdm_mrc, 444 data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1, 445 data->nrg_th_ofdm); 446 447 IWL_DEBUG_CALIB(priv, "cck: ac %u mrc %u thresh %u\n", 448 data->auto_corr_cck, data->auto_corr_cck_mrc, 449 data->nrg_th_cck); 450} 451 452/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */ 453static int iwl_sensitivity_write(struct iwl_priv *priv) 454{ 455 struct iwl_sensitivity_cmd cmd; 456 struct iwl_sensitivity_data *data = NULL; 457 struct iwl_host_cmd cmd_out = { 458 .id = SENSITIVITY_CMD, 459 .len = sizeof(struct iwl_sensitivity_cmd), 460 .flags = CMD_ASYNC, 461 .data = &cmd, 462 }; 463 464 data = &(priv->sensitivity_data); 465 466 memset(&cmd, 0, sizeof(cmd)); 467 468 iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.table[0]); 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 return iwl_send_cmd(priv, &cmd_out); 485} 486 487/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */ 488static int iwl_enhance_sensitivity_write(struct iwl_priv *priv) 489{ 490 struct iwl_enhance_sensitivity_cmd cmd; 491 struct iwl_sensitivity_data *data = NULL; 492 struct iwl_host_cmd cmd_out = { 493 .id = SENSITIVITY_CMD, 494 .len = sizeof(struct iwl_enhance_sensitivity_cmd), 495 .flags = CMD_ASYNC, 496 .data = &cmd, 497 }; 498 499 data = &(priv->sensitivity_data); 500 501 memset(&cmd, 0, sizeof(cmd)); 502 503 iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.enhance_table[0]); 504 505 cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] = 506 HD_INA_NON_SQUARE_DET_OFDM_DATA; 507 cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] = 508 HD_INA_NON_SQUARE_DET_CCK_DATA; 509 cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] = 510 HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA; 511 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] = 512 HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA; 513 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] = 514 HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA; 515 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] = 516 HD_OFDM_NON_SQUARE_DET_SLOPE_DATA; 517 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] = 518 HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA; 519 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] = 520 HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA; 521 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] = 522 HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA; 523 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] = 524 HD_CCK_NON_SQUARE_DET_SLOPE_DATA; 525 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] = 526 HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA; 527 528 /* Update uCode's "work" table, and copy it to DSP */ 529 cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE; 530 531 /* Don't send command to uCode if nothing has changed */ 532 if (!memcmp(&cmd.enhance_table[0], &(priv->sensitivity_tbl[0]), 533 sizeof(u16)*HD_TABLE_SIZE) && 534 !memcmp(&cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX], 535 &(priv->enhance_sensitivity_tbl[0]), 536 sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES)) { 537 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n"); 538 return 0; 539 } 540 541 /* Copy table for comparison next time */ 542 memcpy(&(priv->sensitivity_tbl[0]), &(cmd.enhance_table[0]), 543 sizeof(u16)*HD_TABLE_SIZE); 544 memcpy(&(priv->enhance_sensitivity_tbl[0]), 545 &(cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX]), 546 sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES); 547 548 return iwl_send_cmd(priv, &cmd_out); 549} 550 551void iwl_init_sensitivity(struct iwl_priv *priv) 552{ 553 int ret = 0; 554 int i; 555 struct iwl_sensitivity_data *data = NULL; 556 const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens; 557 558 if (priv->disable_sens_cal) 559 return; 560 561 IWL_DEBUG_CALIB(priv, "Start iwl_init_sensitivity\n"); 562 563 /* Clear driver's sensitivity algo data */ 564 data = &(priv->sensitivity_data); 565 566 if (ranges == NULL) 567 return; 568 569 memset(data, 0, sizeof(struct iwl_sensitivity_data)); 570 571 data->num_in_cck_no_fa = 0; 572 data->nrg_curr_state = IWL_FA_TOO_MANY; 573 data->nrg_prev_state = IWL_FA_TOO_MANY; 574 data->nrg_silence_ref = 0; 575 data->nrg_silence_idx = 0; 576 data->nrg_energy_idx = 0; 577 578 for (i = 0; i < 10; i++) 579 data->nrg_value[i] = 0; 580 581 for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) 582 data->nrg_silence_rssi[i] = 0; 583 584 data->auto_corr_ofdm = ranges->auto_corr_min_ofdm; 585 data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc; 586 data->auto_corr_ofdm_x1 = ranges->auto_corr_min_ofdm_x1; 587 data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1; 588 data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF; 589 data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc; 590 data->nrg_th_cck = ranges->nrg_th_cck; 591 data->nrg_th_ofdm = ranges->nrg_th_ofdm; 592 data->barker_corr_th_min = ranges->barker_corr_th_min; 593 data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc; 594 data->nrg_th_cca = ranges->nrg_th_cca; 595 596 data->last_bad_plcp_cnt_ofdm = 0; 597 data->last_fa_cnt_ofdm = 0; 598 data->last_bad_plcp_cnt_cck = 0; 599 data->last_fa_cnt_cck = 0; 600 601 if (priv->enhance_sensitivity_table) 602 ret |= iwl_enhance_sensitivity_write(priv); 603 else 604 ret |= iwl_sensitivity_write(priv); 605 IWL_DEBUG_CALIB(priv, "<<return 0x%X\n", ret); 606} 607 608void iwl_sensitivity_calibration(struct iwl_priv *priv, void *resp) 609{ 610 u32 rx_enable_time; 611 u32 fa_cck; 612 u32 fa_ofdm; 613 u32 bad_plcp_cck; 614 u32 bad_plcp_ofdm; 615 u32 norm_fa_ofdm; 616 u32 norm_fa_cck; 617 struct iwl_sensitivity_data *data = NULL; 618 struct statistics_rx_non_phy *rx_info; 619 struct statistics_rx_phy *ofdm, *cck; 620 unsigned long flags; 621 struct statistics_general_data statis; 622 623 if (priv->disable_sens_cal) 624 return; 625 626 data = &(priv->sensitivity_data); 627 628 if (!iwl_is_associated(priv)) { 629 IWL_DEBUG_CALIB(priv, "<< - not associated\n"); 630 return; 631 } 632 633 spin_lock_irqsave(&priv->lock, flags); 634 if (priv->cfg->bt_statistics) { 635 rx_info = &(((struct iwl_bt_notif_statistics *)resp)-> 636 rx.general.common); 637 ofdm = &(((struct iwl_bt_notif_statistics *)resp)->rx.ofdm); 638 cck = &(((struct iwl_bt_notif_statistics *)resp)->rx.cck); 639 } else { 640 rx_info = &(((struct iwl_notif_statistics *)resp)->rx.general); 641 ofdm = &(((struct iwl_notif_statistics *)resp)->rx.ofdm); 642 cck = &(((struct iwl_notif_statistics *)resp)->rx.cck); 643 } 644 if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) { 645 IWL_DEBUG_CALIB(priv, "<< invalid data.\n"); 646 spin_unlock_irqrestore(&priv->lock, flags); 647 return; 648 } 649 650 /* Extract Statistics: */ 651 rx_enable_time = le32_to_cpu(rx_info->channel_load); 652 fa_cck = le32_to_cpu(cck->false_alarm_cnt); 653 fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt); 654 bad_plcp_cck = le32_to_cpu(cck->plcp_err); 655 bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err); 656 657 statis.beacon_silence_rssi_a = 658 le32_to_cpu(rx_info->beacon_silence_rssi_a); 659 statis.beacon_silence_rssi_b = 660 le32_to_cpu(rx_info->beacon_silence_rssi_b); 661 statis.beacon_silence_rssi_c = 662 le32_to_cpu(rx_info->beacon_silence_rssi_c); 663 statis.beacon_energy_a = 664 le32_to_cpu(rx_info->beacon_energy_a); 665 statis.beacon_energy_b = 666 le32_to_cpu(rx_info->beacon_energy_b); 667 statis.beacon_energy_c = 668 le32_to_cpu(rx_info->beacon_energy_c); 669 670 spin_unlock_irqrestore(&priv->lock, flags); 671 672 IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time); 673 674 if (!rx_enable_time) { 675 IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0!\n"); 676 return; 677 } 678 679 /* These statistics increase monotonically, and do not reset 680 * at each beacon. Calculate difference from last value, or just 681 * use the new statistics value if it has reset or wrapped around. */ 682 if (data->last_bad_plcp_cnt_cck > bad_plcp_cck) 683 data->last_bad_plcp_cnt_cck = bad_plcp_cck; 684 else { 685 bad_plcp_cck -= data->last_bad_plcp_cnt_cck; 686 data->last_bad_plcp_cnt_cck += bad_plcp_cck; 687 } 688 689 if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm) 690 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm; 691 else { 692 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm; 693 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm; 694 } 695 696 if (data->last_fa_cnt_ofdm > fa_ofdm) 697 data->last_fa_cnt_ofdm = fa_ofdm; 698 else { 699 fa_ofdm -= data->last_fa_cnt_ofdm; 700 data->last_fa_cnt_ofdm += fa_ofdm; 701 } 702 703 if (data->last_fa_cnt_cck > fa_cck) 704 data->last_fa_cnt_cck = fa_cck; 705 else { 706 fa_cck -= data->last_fa_cnt_cck; 707 data->last_fa_cnt_cck += fa_cck; 708 } 709 710 /* Total aborted signal locks */ 711 norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm; 712 norm_fa_cck = fa_cck + bad_plcp_cck; 713 714 IWL_DEBUG_CALIB(priv, "cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck, 715 bad_plcp_cck, fa_ofdm, bad_plcp_ofdm); 716 717 iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time); 718 iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis); 719 if (priv->enhance_sensitivity_table) 720 iwl_enhance_sensitivity_write(priv); 721 else 722 iwl_sensitivity_write(priv); 723} 724 725static inline u8 find_first_chain(u8 mask) 726{ 727 if (mask & ANT_A) 728 return CHAIN_A; 729 if (mask & ANT_B) 730 return CHAIN_B; 731 return CHAIN_C; 732} 733 734/* 735 * Accumulate 20 beacons of signal and noise statistics for each of 736 * 3 receivers/antennas/rx-chains, then figure out: 737 * 1) Which antennas are connected. 738 * 2) Differential rx gain settings to balance the 3 receivers. 739 */ 740void iwl_chain_noise_calibration(struct iwl_priv *priv, void *stat_resp) 741{ 742 struct iwl_chain_noise_data *data = NULL; 743 744 u32 chain_noise_a; 745 u32 chain_noise_b; 746 u32 chain_noise_c; 747 u32 chain_sig_a; 748 u32 chain_sig_b; 749 u32 chain_sig_c; 750 u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE}; 751 u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE}; 752 u32 max_average_sig; 753 u16 max_average_sig_antenna_i; 754 u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE; 755 u16 min_average_noise_antenna_i = INITIALIZATION_VALUE; 756 u16 i = 0; 757 u16 rxon_chnum = INITIALIZATION_VALUE; 758 u16 stat_chnum = INITIALIZATION_VALUE; 759 u8 rxon_band24; 760 u8 stat_band24; 761 u32 active_chains = 0; 762 u8 num_tx_chains; 763 unsigned long flags; 764 struct statistics_rx_non_phy *rx_info; 765 u8 first_chain; 766 767 if (priv->disable_chain_noise_cal) 768 return; 769 770 data = &(priv->chain_noise_data); 771 772 /* 773 * Accumulate just the first "chain_noise_num_beacons" after 774 * the first association, then we're done forever. 775 */ 776 if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) { 777 if (data->state == IWL_CHAIN_NOISE_ALIVE) 778 IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n"); 779 return; 780 } 781 782 spin_lock_irqsave(&priv->lock, flags); 783 if (priv->cfg->bt_statistics) { 784 rx_info = &(((struct iwl_bt_notif_statistics *)stat_resp)-> 785 rx.general.common); 786 } else { 787 rx_info = &(((struct iwl_notif_statistics *)stat_resp)-> 788 rx.general); 789 } 790 if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) { 791 IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n"); 792 spin_unlock_irqrestore(&priv->lock, flags); 793 return; 794 } 795 796 rxon_band24 = !!(priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK); 797 rxon_chnum = le16_to_cpu(priv->staging_rxon.channel); 798 if (priv->cfg->bt_statistics) { 799 stat_band24 = !!(((struct iwl_bt_notif_statistics *) 800 stat_resp)->flag & 801 STATISTICS_REPLY_FLG_BAND_24G_MSK); 802 stat_chnum = le32_to_cpu(((struct iwl_bt_notif_statistics *) 803 stat_resp)->flag) >> 16; 804 } else { 805 stat_band24 = !!(((struct iwl_notif_statistics *) 806 stat_resp)->flag & 807 STATISTICS_REPLY_FLG_BAND_24G_MSK); 808 stat_chnum = le32_to_cpu(((struct iwl_notif_statistics *) 809 stat_resp)->flag) >> 16; 810 } 811 812 /* Make sure we accumulate data for just the associated channel 813 * (even if scanning). */ 814 if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) { 815 IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n", 816 rxon_chnum, rxon_band24); 817 spin_unlock_irqrestore(&priv->lock, flags); 818 return; 819 } 820 821 /* 822 * Accumulate beacon statistics values across 823 * "chain_noise_num_beacons" 824 */ 825 chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) & 826 IN_BAND_FILTER; 827 chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) & 828 IN_BAND_FILTER; 829 chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) & 830 IN_BAND_FILTER; 831 832 chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER; 833 chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER; 834 chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER; 835 836 spin_unlock_irqrestore(&priv->lock, flags); 837 838 data->beacon_count++; 839 840 data->chain_noise_a = (chain_noise_a + data->chain_noise_a); 841 data->chain_noise_b = (chain_noise_b + data->chain_noise_b); 842 data->chain_noise_c = (chain_noise_c + data->chain_noise_c); 843 844 data->chain_signal_a = (chain_sig_a + data->chain_signal_a); 845 data->chain_signal_b = (chain_sig_b + data->chain_signal_b); 846 data->chain_signal_c = (chain_sig_c + data->chain_signal_c); 847 848 IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n", 849 rxon_chnum, rxon_band24, data->beacon_count); 850 IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n", 851 chain_sig_a, chain_sig_b, chain_sig_c); 852 IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n", 853 chain_noise_a, chain_noise_b, chain_noise_c); 854 855 /* If this is the "chain_noise_num_beacons", determine: 856 * 1) Disconnected antennas (using signal strengths) 857 * 2) Differential gain (using silence noise) to balance receivers */ 858 if (data->beacon_count != priv->cfg->chain_noise_num_beacons) 859 return; 860 861 /* Analyze signal for disconnected antenna */ 862 average_sig[0] = 863 (data->chain_signal_a) / priv->cfg->chain_noise_num_beacons; 864 average_sig[1] = 865 (data->chain_signal_b) / priv->cfg->chain_noise_num_beacons; 866 average_sig[2] = 867 (data->chain_signal_c) / priv->cfg->chain_noise_num_beacons; 868 869 if (average_sig[0] >= average_sig[1]) { 870 max_average_sig = average_sig[0]; 871 max_average_sig_antenna_i = 0; 872 active_chains = (1 << max_average_sig_antenna_i); 873 } else { 874 max_average_sig = average_sig[1]; 875 max_average_sig_antenna_i = 1; 876 active_chains = (1 << max_average_sig_antenna_i); 877 } 878 879 if (average_sig[2] >= max_average_sig) { 880 max_average_sig = average_sig[2]; 881 max_average_sig_antenna_i = 2; 882 active_chains = (1 << max_average_sig_antenna_i); 883 } 884 885 IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n", 886 average_sig[0], average_sig[1], average_sig[2]); 887 IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n", 888 max_average_sig, max_average_sig_antenna_i); 889 890 /* Compare signal strengths for all 3 receivers. */ 891 for (i = 0; i < NUM_RX_CHAINS; i++) { 892 if (i != max_average_sig_antenna_i) { 893 s32 rssi_delta = (max_average_sig - average_sig[i]); 894 895 /* If signal is very weak, compared with 896 * strongest, mark it as disconnected. */ 897 if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS) 898 data->disconn_array[i] = 1; 899 else 900 active_chains |= (1 << i); 901 IWL_DEBUG_CALIB(priv, "i = %d rssiDelta = %d " 902 "disconn_array[i] = %d\n", 903 i, rssi_delta, data->disconn_array[i]); 904 } 905 } 906 907 /* 908 * The above algorithm sometimes fails when the ucode 909 * reports 0 for all chains. It's not clear why that 910 * happens to start with, but it is then causing trouble 911 * because this can make us enable more chains than the 912 * hardware really has. 913 * 914 * To be safe, simply mask out any chains that we know 915 * are not on the device. 916 */ 917 active_chains &= priv->hw_params.valid_rx_ant; 918 919 num_tx_chains = 0; 920 for (i = 0; i < NUM_RX_CHAINS; i++) { 921 /* loops on all the bits of 922 * priv->hw_setting.valid_tx_ant */ 923 u8 ant_msk = (1 << i); 924 if (!(priv->hw_params.valid_tx_ant & ant_msk)) 925 continue; 926 927 num_tx_chains++; 928 if (data->disconn_array[i] == 0) 929 /* there is a Tx antenna connected */ 930 break; 931 if (num_tx_chains == priv->hw_params.tx_chains_num && 932 data->disconn_array[i]) { 933 /* 934 * If all chains are disconnected 935 * connect the first valid tx chain 936 */ 937 first_chain = 938 find_first_chain(priv->cfg->valid_tx_ant); 939 data->disconn_array[first_chain] = 0; 940 active_chains |= BIT(first_chain); 941 IWL_DEBUG_CALIB(priv, "All Tx chains are disconnected W/A - declare %d as connected\n", 942 first_chain); 943 break; 944 } 945 } 946 947 if (active_chains != priv->hw_params.valid_rx_ant && 948 active_chains != priv->chain_noise_data.active_chains) 949 IWL_DEBUG_CALIB(priv, 950 "Detected that not all antennas are connected! " 951 "Connected: %#x, valid: %#x.\n", 952 active_chains, priv->hw_params.valid_rx_ant); 953 954 /* Save for use within RXON, TX, SCAN commands, etc. */ 955 priv->chain_noise_data.active_chains = active_chains; 956 IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n", 957 active_chains); 958 959 /* Analyze noise for rx balance */ 960 average_noise[0] = 961 ((data->chain_noise_a) / priv->cfg->chain_noise_num_beacons); 962 average_noise[1] = 963 ((data->chain_noise_b) / priv->cfg->chain_noise_num_beacons); 964 average_noise[2] = 965 ((data->chain_noise_c) / priv->cfg->chain_noise_num_beacons); 966 967 for (i = 0; i < NUM_RX_CHAINS; i++) { 968 if (!(data->disconn_array[i]) && 969 (average_noise[i] <= min_average_noise)) { 970 /* This means that chain i is active and has 971 * lower noise values so far: */ 972 min_average_noise = average_noise[i]; 973 min_average_noise_antenna_i = i; 974 } 975 } 976 977 IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n", 978 average_noise[0], average_noise[1], 979 average_noise[2]); 980 981 IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n", 982 min_average_noise, min_average_noise_antenna_i); 983 984 if (priv->cfg->ops->utils->gain_computation) 985 priv->cfg->ops->utils->gain_computation(priv, average_noise, 986 min_average_noise_antenna_i, min_average_noise, 987 find_first_chain(priv->cfg->valid_rx_ant)); 988 989 /* Some power changes may have been made during the calibration. 990 * Update and commit the RXON 991 */ 992 if (priv->cfg->ops->lib->update_chain_flags) 993 priv->cfg->ops->lib->update_chain_flags(priv); 994 995 data->state = IWL_CHAIN_NOISE_DONE; 996 iwl_power_update_mode(priv, false); 997} 998 999void iwl_reset_run_time_calib(struct iwl_priv *priv) 1000{ 1001 int i; 1002 memset(&(priv->sensitivity_data), 0, 1003 sizeof(struct iwl_sensitivity_data)); 1004 memset(&(priv->chain_noise_data), 0, 1005 sizeof(struct iwl_chain_noise_data)); 1006 for (i = 0; i < NUM_RX_CHAINS; i++) 1007 priv->chain_noise_data.delta_gain_code[i] = 1008 CHAIN_NOISE_DELTA_GAIN_INIT_VAL; 1009 1010 /* Ask for statistics now, the uCode will send notification 1011 * periodically after association */ 1012 iwl_send_statistics_request(priv, CMD_ASYNC, true); 1013} 1014