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On Tue, Nov 06, 2007 at 02:33:53AM -0800, akpm@linux-foundation.org wrote:
[mmotm.git] / drivers / net / wireless / iwlwifi / iwl-calib.c
blob1f801eb9fbff38cf5496df880e2e85b43be9f194
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
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 data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK;
255 /* Else if we got fewer than desired, increase sensitivity */
256 } else if (false_alarms < min_false_alarms) {
257 data->nrg_curr_state = IWL_FA_TOO_FEW;
258
259 /* Compare silence level with silence level for most recent
260 * healthy number or too many false alarms */
261 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
262 (s32)silence_ref;
263
264 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u, silence diff %d\n",
265 false_alarms, min_false_alarms,
266 data->nrg_auto_corr_silence_diff);
267
268 /* Increase value to increase sensitivity, but only if:
269 * 1a) previous beacon did *not* have *too many* false alarms
270 * 1b) AND there's a significant difference in Rx levels
271 * from a previous beacon with too many, or healthy # FAs
272 * OR 2) We've seen a lot of beacons (100) with too few
273 * false alarms */
274 if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
275 ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
276 (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
277
278 IWL_DEBUG_CALIB(priv, "... increasing sensitivity\n");
279 /* Increase nrg value to increase sensitivity */
280 val = data->nrg_th_cck + NRG_STEP_CCK;
281 data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
282 } else {
283 IWL_DEBUG_CALIB(priv, "... but not changing sensitivity\n");
284 }
285
286 /* Else we got a healthy number of false alarms, keep status quo */
287 } else {
288 IWL_DEBUG_CALIB(priv, " FA in safe zone\n");
289 data->nrg_curr_state = IWL_FA_GOOD_RANGE;
290
291 /* Store for use in "fewer than desired" with later beacon */
292 data->nrg_silence_ref = silence_ref;
293
294 /* If previous beacon had too many false alarms,
295 * give it some extra margin by reducing sensitivity again
296 * (but don't go below measured energy of desired Rx) */
297 if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
298 IWL_DEBUG_CALIB(priv, "... increasing margin\n");
299 if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
300 data->nrg_th_cck -= NRG_MARGIN;
301 else
302 data->nrg_th_cck = max_nrg_cck;
303 }
304 }
305
306 /* Make sure the energy threshold does not go above the measured
307 * energy of the desired Rx signals (reduced by backoff margin),
308 * or else we might start missing Rx frames.
309 * Lower value is higher energy, so we use max()!
310 */
311 data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
312 IWL_DEBUG_CALIB(priv, "new nrg_th_cck %u\n", data->nrg_th_cck);
313
314 data->nrg_prev_state = data->nrg_curr_state;
315
316 /* Auto-correlation CCK algorithm */
317 if (false_alarms > min_false_alarms) {
318
319 /* increase auto_corr values to decrease sensitivity
320 * so the DSP won't be disturbed by the noise
321 */
322 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
323 data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
324 else {
325 val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
326 data->auto_corr_cck =
327 min((u32)ranges->auto_corr_max_cck, val);
328 }
329 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
330 data->auto_corr_cck_mrc =
331 min((u32)ranges->auto_corr_max_cck_mrc, val);
332 } else if ((false_alarms < min_false_alarms) &&
333 ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
334 (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
335
336 /* Decrease auto_corr values to increase sensitivity */
337 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
338 data->auto_corr_cck =
339 max((u32)ranges->auto_corr_min_cck, val);
340 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
341 data->auto_corr_cck_mrc =
342 max((u32)ranges->auto_corr_min_cck_mrc, val);
343 }
344
345 return 0;
346 }
347
348
349 static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,
350 u32 norm_fa,
351 u32 rx_enable_time)
352 {
353 u32 val;
354 u32 false_alarms = norm_fa * 200 * 1024;
355 u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
356 u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
357 struct iwl_sensitivity_data *data = NULL;
358 const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
359
360 data = &(priv->sensitivity_data);
361
362 /* If we got too many false alarms this time, reduce sensitivity */
363 if (false_alarms > max_false_alarms) {
364
365 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u)\n",
366 false_alarms, max_false_alarms);
367
368 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
369 data->auto_corr_ofdm =
370 min((u32)ranges->auto_corr_max_ofdm, val);
371
372 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
373 data->auto_corr_ofdm_mrc =
374 min((u32)ranges->auto_corr_max_ofdm_mrc, val);
375
376 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
377 data->auto_corr_ofdm_x1 =
378 min((u32)ranges->auto_corr_max_ofdm_x1, val);
379
380 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
381 data->auto_corr_ofdm_mrc_x1 =
382 min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
383 }
384
385 /* Else if we got fewer than desired, increase sensitivity */
386 else if (false_alarms < min_false_alarms) {
387
388 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u\n",
389 false_alarms, min_false_alarms);
390
391 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
392 data->auto_corr_ofdm =
393 max((u32)ranges->auto_corr_min_ofdm, val);
394
395 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
396 data->auto_corr_ofdm_mrc =
397 max((u32)ranges->auto_corr_min_ofdm_mrc, val);
398
399 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
400 data->auto_corr_ofdm_x1 =
401 max((u32)ranges->auto_corr_min_ofdm_x1, val);
402
403 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
404 data->auto_corr_ofdm_mrc_x1 =
405 max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
406 } else {
407 IWL_DEBUG_CALIB(priv, "min FA %u < norm FA %u < max FA %u OK\n",
408 min_false_alarms, false_alarms, max_false_alarms);
409 }
410 return 0;
411 }
412
413 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
414 static int iwl_sensitivity_write(struct iwl_priv *priv)
415 {
416 int ret = 0;
417 struct iwl_sensitivity_cmd cmd ;
418 struct iwl_sensitivity_data *data = NULL;
419 struct iwl_host_cmd cmd_out = {
420 .id = SENSITIVITY_CMD,
421 .len = sizeof(struct iwl_sensitivity_cmd),
422 .flags = CMD_ASYNC,
423 .data = &cmd,
424 };
425
426 data = &(priv->sensitivity_data);
427
428 memset(&cmd, 0, sizeof(cmd));
429
430 cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
431 cpu_to_le16((u16)data->auto_corr_ofdm);
432 cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
433 cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
434 cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
435 cpu_to_le16((u16)data->auto_corr_ofdm_x1);
436 cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
437 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
438
439 cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
440 cpu_to_le16((u16)data->auto_corr_cck);
441 cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
442 cpu_to_le16((u16)data->auto_corr_cck_mrc);
443
444 cmd.table[HD_MIN_ENERGY_CCK_DET_INDEX] =
445 cpu_to_le16((u16)data->nrg_th_cck);
446 cmd.table[HD_MIN_ENERGY_OFDM_DET_INDEX] =
447 cpu_to_le16((u16)data->nrg_th_ofdm);
448
449 cmd.table[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
450 cpu_to_le16(data->barker_corr_th_min);
451 cmd.table[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
452 cpu_to_le16(data->barker_corr_th_min_mrc);
453 cmd.table[HD_OFDM_ENERGY_TH_IN_INDEX] =
454 cpu_to_le16(data->nrg_th_cca);
455
456 IWL_DEBUG_CALIB(priv, "ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
457 data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
458 data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
459 data->nrg_th_ofdm);
460
461 IWL_DEBUG_CALIB(priv, "cck: ac %u mrc %u thresh %u\n",
462 data->auto_corr_cck, data->auto_corr_cck_mrc,
463 data->nrg_th_cck);
464
465 /* Update uCode's "work" table, and copy it to DSP */
466 cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
467
468 /* Don't send command to uCode if nothing has changed */
469 if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
470 sizeof(u16)*HD_TABLE_SIZE)) {
471 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
472 return 0;
473 }
474
475 /* Copy table for comparison next time */
476 memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
477 sizeof(u16)*HD_TABLE_SIZE);
478
479 ret = iwl_send_cmd(priv, &cmd_out);
480 if (ret)
481 IWL_ERR(priv, "SENSITIVITY_CMD failed\n");
482
483 return ret;
484 }
485
486 void iwl_init_sensitivity(struct iwl_priv *priv)
487 {
488 int ret = 0;
489 int i;
490 struct iwl_sensitivity_data *data = NULL;
491 const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
492
493 if (priv->disable_sens_cal)
494 return;
495
496 IWL_DEBUG_CALIB(priv, "Start iwl_init_sensitivity\n");
497
498 /* Clear driver's sensitivity algo data */
499 data = &(priv->sensitivity_data);
500
501 if (ranges == NULL)
502 return;
503
504 memset(data, 0, sizeof(struct iwl_sensitivity_data));
505
506 data->num_in_cck_no_fa = 0;
507 data->nrg_curr_state = IWL_FA_TOO_MANY;
508 data->nrg_prev_state = IWL_FA_TOO_MANY;
509 data->nrg_silence_ref = 0;
510 data->nrg_silence_idx = 0;
511 data->nrg_energy_idx = 0;
512
513 for (i = 0; i < 10; i++)
514 data->nrg_value[i] = 0;
515
516 for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
517 data->nrg_silence_rssi[i] = 0;
518
519 data->auto_corr_ofdm = ranges->auto_corr_min_ofdm;
520 data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
521 data->auto_corr_ofdm_x1 = ranges->auto_corr_min_ofdm_x1;
522 data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
523 data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
524 data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
525 data->nrg_th_cck = ranges->nrg_th_cck;
526 data->nrg_th_ofdm = ranges->nrg_th_ofdm;
527 data->barker_corr_th_min = ranges->barker_corr_th_min;
528 data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc;
529 data->nrg_th_cca = ranges->nrg_th_cca;
530
531 data->last_bad_plcp_cnt_ofdm = 0;
532 data->last_fa_cnt_ofdm = 0;
533 data->last_bad_plcp_cnt_cck = 0;
534 data->last_fa_cnt_cck = 0;
535
536 ret |= iwl_sensitivity_write(priv);
537 IWL_DEBUG_CALIB(priv, "<<return 0x%X\n", ret);
538 }
539 EXPORT_SYMBOL(iwl_init_sensitivity);
540
541 void iwl_sensitivity_calibration(struct iwl_priv *priv,
542 struct iwl_notif_statistics *resp)
543 {
544 u32 rx_enable_time;
545 u32 fa_cck;
546 u32 fa_ofdm;
547 u32 bad_plcp_cck;
548 u32 bad_plcp_ofdm;
549 u32 norm_fa_ofdm;
550 u32 norm_fa_cck;
551 struct iwl_sensitivity_data *data = NULL;
552 struct statistics_rx_non_phy *rx_info = &(resp->rx.general);
553 struct statistics_rx *statistics = &(resp->rx);
554 unsigned long flags;
555 struct statistics_general_data statis;
556
557 if (priv->disable_sens_cal)
558 return;
559
560 data = &(priv->sensitivity_data);
561
562 if (!iwl_is_associated(priv)) {
563 IWL_DEBUG_CALIB(priv, "<< - not associated\n");
564 return;
565 }
566
567 spin_lock_irqsave(&priv->lock, flags);
568 if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
569 IWL_DEBUG_CALIB(priv, "<< invalid data.\n");
570 spin_unlock_irqrestore(&priv->lock, flags);
571 return;
572 }
573
574 /* Extract Statistics: */
575 rx_enable_time = le32_to_cpu(rx_info->channel_load);
576 fa_cck = le32_to_cpu(statistics->cck.false_alarm_cnt);
577 fa_ofdm = le32_to_cpu(statistics->ofdm.false_alarm_cnt);
578 bad_plcp_cck = le32_to_cpu(statistics->cck.plcp_err);
579 bad_plcp_ofdm = le32_to_cpu(statistics->ofdm.plcp_err);
580
581 statis.beacon_silence_rssi_a =
582 le32_to_cpu(statistics->general.beacon_silence_rssi_a);
583 statis.beacon_silence_rssi_b =
584 le32_to_cpu(statistics->general.beacon_silence_rssi_b);
585 statis.beacon_silence_rssi_c =
586 le32_to_cpu(statistics->general.beacon_silence_rssi_c);
587 statis.beacon_energy_a =
588 le32_to_cpu(statistics->general.beacon_energy_a);
589 statis.beacon_energy_b =
590 le32_to_cpu(statistics->general.beacon_energy_b);
591 statis.beacon_energy_c =
592 le32_to_cpu(statistics->general.beacon_energy_c);
593
594 spin_unlock_irqrestore(&priv->lock, flags);
595
596 IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time);
597
598 if (!rx_enable_time) {
599 IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0! \n");
600 return;
601 }
602
603 /* These statistics increase monotonically, and do not reset
604 * at each beacon. Calculate difference from last value, or just
605 * use the new statistics value if it has reset or wrapped around. */
606 if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
607 data->last_bad_plcp_cnt_cck = bad_plcp_cck;
608 else {
609 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
610 data->last_bad_plcp_cnt_cck += bad_plcp_cck;
611 }
612
613 if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
614 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
615 else {
616 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
617 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
618 }
619
620 if (data->last_fa_cnt_ofdm > fa_ofdm)
621 data->last_fa_cnt_ofdm = fa_ofdm;
622 else {
623 fa_ofdm -= data->last_fa_cnt_ofdm;
624 data->last_fa_cnt_ofdm += fa_ofdm;
625 }
626
627 if (data->last_fa_cnt_cck > fa_cck)
628 data->last_fa_cnt_cck = fa_cck;
629 else {
630 fa_cck -= data->last_fa_cnt_cck;
631 data->last_fa_cnt_cck += fa_cck;
632 }
633
634 /* Total aborted signal locks */
635 norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
636 norm_fa_cck = fa_cck + bad_plcp_cck;
637
638 IWL_DEBUG_CALIB(priv, "cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck,
639 bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
640
641 iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
642 iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
643 iwl_sensitivity_write(priv);
644
645 return;
646 }
647 EXPORT_SYMBOL(iwl_sensitivity_calibration);
648
649 static inline u8 find_first_chain(u8 mask)
650 {
651 if (mask & ANT_A)
652 return CHAIN_A;
653 if (mask & ANT_B)
654 return CHAIN_B;
655 return CHAIN_C;
656 }
657
658 /*
659 * Accumulate 20 beacons of signal and noise statistics for each of
660 * 3 receivers/antennas/rx-chains, then figure out:
661 * 1) Which antennas are connected.
662 * 2) Differential rx gain settings to balance the 3 receivers.
663 */
664 void iwl_chain_noise_calibration(struct iwl_priv *priv,
665 struct iwl_notif_statistics *stat_resp)
666 {
667 struct iwl_chain_noise_data *data = NULL;
668
669 u32 chain_noise_a;
670 u32 chain_noise_b;
671 u32 chain_noise_c;
672 u32 chain_sig_a;
673 u32 chain_sig_b;
674 u32 chain_sig_c;
675 u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
676 u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
677 u32 max_average_sig;
678 u16 max_average_sig_antenna_i;
679 u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
680 u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
681 u16 i = 0;
682 u16 rxon_chnum = INITIALIZATION_VALUE;
683 u16 stat_chnum = INITIALIZATION_VALUE;
684 u8 rxon_band24;
685 u8 stat_band24;
686 u32 active_chains = 0;
687 u8 num_tx_chains;
688 unsigned long flags;
689 struct statistics_rx_non_phy *rx_info = &(stat_resp->rx.general);
690 u8 first_chain;
691
692 if (priv->disable_chain_noise_cal)
693 return;
694
695 data = &(priv->chain_noise_data);
696
697 /*
698 * Accumulate just the first "chain_noise_num_beacons" after
699 * the first association, then we're done forever.
700 */
701 if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
702 if (data->state == IWL_CHAIN_NOISE_ALIVE)
703 IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n");
704 return;
705 }
706
707 spin_lock_irqsave(&priv->lock, flags);
708 if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
709 IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n");
710 spin_unlock_irqrestore(&priv->lock, flags);
711 return;
712 }
713
714 rxon_band24 = !!(priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK);
715 rxon_chnum = le16_to_cpu(priv->staging_rxon.channel);
716 stat_band24 = !!(stat_resp->flag & STATISTICS_REPLY_FLG_BAND_24G_MSK);
717 stat_chnum = le32_to_cpu(stat_resp->flag) >> 16;
718
719 /* Make sure we accumulate data for just the associated channel
720 * (even if scanning). */
721 if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
722 IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n",
723 rxon_chnum, rxon_band24);
724 spin_unlock_irqrestore(&priv->lock, flags);
725 return;
726 }
727
728 /*
729 * Accumulate beacon statistics values across
730 * "chain_noise_num_beacons"
731 */
732 chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
733 IN_BAND_FILTER;
734 chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
735 IN_BAND_FILTER;
736 chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
737 IN_BAND_FILTER;
738
739 chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
740 chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
741 chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
742
743 spin_unlock_irqrestore(&priv->lock, flags);
744
745 data->beacon_count++;
746
747 data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
748 data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
749 data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
750
751 data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
752 data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
753 data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
754
755 IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n",
756 rxon_chnum, rxon_band24, data->beacon_count);
757 IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n",
758 chain_sig_a, chain_sig_b, chain_sig_c);
759 IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n",
760 chain_noise_a, chain_noise_b, chain_noise_c);
761
762 /* If this is the "chain_noise_num_beacons", determine:
763 * 1) Disconnected antennas (using signal strengths)
764 * 2) Differential gain (using silence noise) to balance receivers */
765 if (data->beacon_count != priv->cfg->chain_noise_num_beacons)
766 return;
767
768 /* Analyze signal for disconnected antenna */
769 average_sig[0] =
770 (data->chain_signal_a) / priv->cfg->chain_noise_num_beacons;
771 average_sig[1] =
772 (data->chain_signal_b) / priv->cfg->chain_noise_num_beacons;
773 average_sig[2] =
774 (data->chain_signal_c) / priv->cfg->chain_noise_num_beacons;
775
776 if (average_sig[0] >= average_sig[1]) {
777 max_average_sig = average_sig[0];
778 max_average_sig_antenna_i = 0;
779 active_chains = (1 << max_average_sig_antenna_i);
780 } else {
781 max_average_sig = average_sig[1];
782 max_average_sig_antenna_i = 1;
783 active_chains = (1 << max_average_sig_antenna_i);
784 }
785
786 if (average_sig[2] >= max_average_sig) {
787 max_average_sig = average_sig[2];
788 max_average_sig_antenna_i = 2;
789 active_chains = (1 << max_average_sig_antenna_i);
790 }
791
792 IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n",
793 average_sig[0], average_sig[1], average_sig[2]);
794 IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n",
795 max_average_sig, max_average_sig_antenna_i);
796
797 /* Compare signal strengths for all 3 receivers. */
798 for (i = 0; i < NUM_RX_CHAINS; i++) {
799 if (i != max_average_sig_antenna_i) {
800 s32 rssi_delta = (max_average_sig - average_sig[i]);
801
802 /* If signal is very weak, compared with
803 * strongest, mark it as disconnected. */
804 if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
805 data->disconn_array[i] = 1;
806 else
807 active_chains |= (1 << i);
808 IWL_DEBUG_CALIB(priv, "i = %d rssiDelta = %d "
809 "disconn_array[i] = %d\n",
810 i, rssi_delta, data->disconn_array[i]);
811 }
812 }
813
814 num_tx_chains = 0;
815 for (i = 0; i < NUM_RX_CHAINS; i++) {
816 /* loops on all the bits of
817 * priv->hw_setting.valid_tx_ant */
818 u8 ant_msk = (1 << i);
819 if (!(priv->hw_params.valid_tx_ant & ant_msk))
820 continue;
821
822 num_tx_chains++;
823 if (data->disconn_array[i] == 0)
824 /* there is a Tx antenna connected */
825 break;
826 if (num_tx_chains == priv->hw_params.tx_chains_num &&
827 data->disconn_array[i]) {
828 /*
829 * If all chains are disconnected
830 * connect the first valid tx chain
831 */
832 first_chain =
833 find_first_chain(priv->cfg->valid_tx_ant);
834 data->disconn_array[first_chain] = 0;
835 active_chains |= BIT(first_chain);
836 IWL_DEBUG_CALIB(priv, "All Tx chains are disconnected W/A - declare %d as connected\n",
837 first_chain);
838 break;
839 }
840 }
841
842 /* Save for use within RXON, TX, SCAN commands, etc. */
843 priv->chain_noise_data.active_chains = active_chains;
844 IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",
845 active_chains);
846
847 /* Analyze noise for rx balance */
848 average_noise[0] =
849 ((data->chain_noise_a) / priv->cfg->chain_noise_num_beacons);
850 average_noise[1] =
851 ((data->chain_noise_b) / priv->cfg->chain_noise_num_beacons);
852 average_noise[2] =
853 ((data->chain_noise_c) / priv->cfg->chain_noise_num_beacons);
854
855 for (i = 0; i < NUM_RX_CHAINS; i++) {
856 if (!(data->disconn_array[i]) &&
857 (average_noise[i] <= min_average_noise)) {
858 /* This means that chain i is active and has
859 * lower noise values so far: */
860 min_average_noise = average_noise[i];
861 min_average_noise_antenna_i = i;
862 }
863 }
864
865 IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n",
866 average_noise[0], average_noise[1],
867 average_noise[2]);
868
869 IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n",
870 min_average_noise, min_average_noise_antenna_i);
871
872 if (priv->cfg->ops->utils->gain_computation)
873 priv->cfg->ops->utils->gain_computation(priv, average_noise,
874 min_average_noise_antenna_i, min_average_noise,
875 find_first_chain(priv->cfg->valid_rx_ant));
876
877 /* Some power changes may have been made during the calibration.
878 * Update and commit the RXON
879 */
880 if (priv->cfg->ops->lib->update_chain_flags)
881 priv->cfg->ops->lib->update_chain_flags(priv);
882
883 data->state = IWL_CHAIN_NOISE_DONE;
884 iwl_power_update_mode(priv, false);
885 }
886 EXPORT_SYMBOL(iwl_chain_noise_calibration);
887
888
889 void iwl_reset_run_time_calib(struct iwl_priv *priv)
890 {
891 int i;
892 memset(&(priv->sensitivity_data), 0,
893 sizeof(struct iwl_sensitivity_data));
894 memset(&(priv->chain_noise_data), 0,
895 sizeof(struct iwl_chain_noise_data));
896 for (i = 0; i < NUM_RX_CHAINS; i++)
897 priv->chain_noise_data.delta_gain_code[i] =
898 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
899
900 /* Ask for statistics now, the uCode will send notification
901 * periodically after association */
902 iwl_send_statistics_request(priv, CMD_ASYNC);
903 }
904 EXPORT_SYMBOL(iwl_reset_run_time_calib);
905
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