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authorEmmanuel Grumbach <emmanuel.grumbach@intel.com>2008-04-16 19:34:47 -0400
committerJohn W. Linville <linville@tuxdriver.com>2008-05-07 15:02:10 -0400
commitf0832f137c21d130998a0f97f97ac01a2d97210b (patch)
tree6b9af836baa6133caaf4aebe3717719c9cbb7725 /drivers/net/wireless/iwlwifi/iwl-calib.c
parenta7ca0268b5dfffcaa8a1fe40c6eccdeac50fa3ea (diff)
iwlwifi: HW dependent run time calibration
This patch does several things: 1) rename CONFIG_IWL4965_SENSITIVITY to IWL4965_RUN_TIME_CALIB which is better semantic 2) move all the run time calibration to a new file: iwl-calib.c 3) simplify the sensitivity calibration flow and make it HW dependent 4) make the chain noise calibration flow HW dependent Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-calib.c')
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-calib.c778
1 files changed, 778 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-calib.c b/drivers/net/wireless/iwlwifi/iwl-calib.c
new file mode 100644
index 000000000000..16213b05ed93
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/iwl-calib.c
@@ -0,0 +1,778 @@
1/******************************************************************************
2 *
3 * This file is provided under a dual BSD/GPLv2 license. When using or
4 * redistributing this file, you may do so under either license.
5 *
6 * GPL LICENSE SUMMARY
7 *
8 * Copyright(c) 2008 Intel Corporation. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of version 2 of the GNU General Public License as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
22 * USA
23 *
24 * The full GNU General Public License is included in this distribution
25 * in the file called LICENSE.GPL.
26 *
27 * Contact Information:
28 * Tomas Winkler <tomas.winkler@intel.com>
29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
30 *
31 * BSD LICENSE
32 *
33 * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 *
40 * * Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * * Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in
44 * the documentation and/or other materials provided with the
45 * distribution.
46 * * Neither the name Intel Corporation nor the names of its
47 * contributors may be used to endorse or promote products derived
48 * from this software without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 *****************************************************************************/
62
63#include <linux/kernel.h>
64#include <net/mac80211.h>
65
66#include "iwl-4965.h"
67#include "iwl-core.h"
68#include "iwl-calib.h"
69#include "iwl-eeprom.h"
70
71/* "false alarms" are signals that our DSP tries to lock onto,
72 * but then determines that they are either noise, or transmissions
73 * from a distant wireless network (also "noise", really) that get
74 * "stepped on" by stronger transmissions within our own network.
75 * This algorithm attempts to set a sensitivity level that is high
76 * enough to receive all of our own network traffic, but not so
77 * high that our DSP gets too busy trying to lock onto non-network
78 * activity/noise. */
79static int iwl_sens_energy_cck(struct iwl_priv *priv,
80 u32 norm_fa,
81 u32 rx_enable_time,
82 struct statistics_general_data *rx_info)
83{
84 u32 max_nrg_cck = 0;
85 int i = 0;
86 u8 max_silence_rssi = 0;
87 u32 silence_ref = 0;
88 u8 silence_rssi_a = 0;
89 u8 silence_rssi_b = 0;
90 u8 silence_rssi_c = 0;
91 u32 val;
92
93 /* "false_alarms" values below are cross-multiplications to assess the
94 * numbers of false alarms within the measured period of actual Rx
95 * (Rx is off when we're txing), vs the min/max expected false alarms
96 * (some should be expected if rx is sensitive enough) in a
97 * hypothetical listening period of 200 time units (TU), 204.8 msec:
98 *
99 * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
100 *
101 * */
102 u32 false_alarms = norm_fa * 200 * 1024;
103 u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
104 u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
105 struct iwl_sensitivity_data *data = NULL;
106 const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
107
108 data = &(priv->sensitivity_data);
109
110 data->nrg_auto_corr_silence_diff = 0;
111
112 /* Find max silence rssi among all 3 receivers.
113 * This is background noise, which may include transmissions from other
114 * networks, measured during silence before our network's beacon */
115 silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
116 ALL_BAND_FILTER) >> 8);
117 silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
118 ALL_BAND_FILTER) >> 8);
119 silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
120 ALL_BAND_FILTER) >> 8);
121
122 val = max(silence_rssi_b, silence_rssi_c);
123 max_silence_rssi = max(silence_rssi_a, (u8) val);
124
125 /* Store silence rssi in 20-beacon history table */
126 data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
127 data->nrg_silence_idx++;
128 if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
129 data->nrg_silence_idx = 0;
130
131 /* Find max silence rssi across 20 beacon history */
132 for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
133 val = data->nrg_silence_rssi[i];
134 silence_ref = max(silence_ref, val);
135 }
136 IWL_DEBUG_CALIB("silence a %u, b %u, c %u, 20-bcn max %u\n",
137 silence_rssi_a, silence_rssi_b, silence_rssi_c,
138 silence_ref);
139
140 /* Find max rx energy (min value!) among all 3 receivers,
141 * measured during beacon frame.
142 * Save it in 10-beacon history table. */
143 i = data->nrg_energy_idx;
144 val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
145 data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
146
147 data->nrg_energy_idx++;
148 if (data->nrg_energy_idx >= 10)
149 data->nrg_energy_idx = 0;
150
151 /* Find min rx energy (max value) across 10 beacon history.
152 * This is the minimum signal level that we want to receive well.
153 * Add backoff (margin so we don't miss slightly lower energy frames).
154 * This establishes an upper bound (min value) for energy threshold. */
155 max_nrg_cck = data->nrg_value[0];
156 for (i = 1; i < 10; i++)
157 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
158 max_nrg_cck += 6;
159
160 IWL_DEBUG_CALIB("rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
161 rx_info->beacon_energy_a, rx_info->beacon_energy_b,
162 rx_info->beacon_energy_c, max_nrg_cck - 6);
163
164 /* Count number of consecutive beacons with fewer-than-desired
165 * false alarms. */
166 if (false_alarms < min_false_alarms)
167 data->num_in_cck_no_fa++;
168 else
169 data->num_in_cck_no_fa = 0;
170 IWL_DEBUG_CALIB("consecutive bcns with few false alarms = %u\n",
171 data->num_in_cck_no_fa);
172
173 /* If we got too many false alarms this time, reduce sensitivity */
174 if ((false_alarms > max_false_alarms) &&
175 (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {
176 IWL_DEBUG_CALIB("norm FA %u > max FA %u\n",
177 false_alarms, max_false_alarms);
178 IWL_DEBUG_CALIB("... reducing sensitivity\n");
179 data->nrg_curr_state = IWL_FA_TOO_MANY;
180 /* Store for "fewer than desired" on later beacon */
181 data->nrg_silence_ref = silence_ref;
182
183 /* increase energy threshold (reduce nrg value)
184 * to decrease sensitivity */
185 if (data->nrg_th_cck >
186 (ranges->max_nrg_cck + NRG_STEP_CCK))
187 data->nrg_th_cck = data->nrg_th_cck
188 - NRG_STEP_CCK;
189 else
190 data->nrg_th_cck = ranges->max_nrg_cck;
191 /* Else if we got fewer than desired, increase sensitivity */
192 } else if (false_alarms < min_false_alarms) {
193 data->nrg_curr_state = IWL_FA_TOO_FEW;
194
195 /* Compare silence level with silence level for most recent
196 * healthy number or too many false alarms */
197 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
198 (s32)silence_ref;
199
200 IWL_DEBUG_CALIB("norm FA %u < min FA %u, silence diff %d\n",
201 false_alarms, min_false_alarms,
202 data->nrg_auto_corr_silence_diff);
203
204 /* Increase value to increase sensitivity, but only if:
205 * 1a) previous beacon did *not* have *too many* false alarms
206 * 1b) AND there's a significant difference in Rx levels
207 * from a previous beacon with too many, or healthy # FAs
208 * OR 2) We've seen a lot of beacons (100) with too few
209 * false alarms */
210 if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
211 ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
212 (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
213
214 IWL_DEBUG_CALIB("... increasing sensitivity\n");
215 /* Increase nrg value to increase sensitivity */
216 val = data->nrg_th_cck + NRG_STEP_CCK;
217 data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
218 } else {
219 IWL_DEBUG_CALIB("... but not changing sensitivity\n");
220 }
221
222 /* Else we got a healthy number of false alarms, keep status quo */
223 } else {
224 IWL_DEBUG_CALIB(" FA in safe zone\n");
225 data->nrg_curr_state = IWL_FA_GOOD_RANGE;
226
227 /* Store for use in "fewer than desired" with later beacon */
228 data->nrg_silence_ref = silence_ref;
229
230 /* If previous beacon had too many false alarms,
231 * give it some extra margin by reducing sensitivity again
232 * (but don't go below measured energy of desired Rx) */
233 if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
234 IWL_DEBUG_CALIB("... increasing margin\n");
235 if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
236 data->nrg_th_cck -= NRG_MARGIN;
237 else
238 data->nrg_th_cck = max_nrg_cck;
239 }
240 }
241
242 /* Make sure the energy threshold does not go above the measured
243 * energy of the desired Rx signals (reduced by backoff margin),
244 * or else we might start missing Rx frames.
245 * Lower value is higher energy, so we use max()!
246 */
247 data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
248 IWL_DEBUG_CALIB("new nrg_th_cck %u\n", data->nrg_th_cck);
249
250 data->nrg_prev_state = data->nrg_curr_state;
251
252 /* Auto-correlation CCK algorithm */
253 if (false_alarms > min_false_alarms) {
254
255 /* increase auto_corr values to decrease sensitivity
256 * so the DSP won't be disturbed by the noise
257 */
258 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
259 data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
260 else {
261 val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
262 data->auto_corr_cck =
263 min((u32)ranges->auto_corr_max_cck, val);
264 }
265 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
266 data->auto_corr_cck_mrc =
267 min((u32)ranges->auto_corr_max_cck_mrc, val);
268 } else if ((false_alarms < min_false_alarms) &&
269 ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
270 (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
271
272 /* Decrease auto_corr values to increase sensitivity */
273 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
274 data->auto_corr_cck =
275 max((u32)ranges->auto_corr_min_cck, val);
276 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
277 data->auto_corr_cck_mrc =
278 max((u32)ranges->auto_corr_min_cck_mrc, val);
279 }
280
281 return 0;
282}
283
284
285static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,
286 u32 norm_fa,
287 u32 rx_enable_time)
288{
289 u32 val;
290 u32 false_alarms = norm_fa * 200 * 1024;
291 u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
292 u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
293 struct iwl_sensitivity_data *data = NULL;
294 const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
295
296 data = &(priv->sensitivity_data);
297
298 /* If we got too many false alarms this time, reduce sensitivity */
299 if (false_alarms > max_false_alarms) {
300
301 IWL_DEBUG_CALIB("norm FA %u > max FA %u)\n",
302 false_alarms, max_false_alarms);
303
304 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
305 data->auto_corr_ofdm =
306 min((u32)ranges->auto_corr_max_ofdm, val);
307
308 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
309 data->auto_corr_ofdm_mrc =
310 min((u32)ranges->auto_corr_max_ofdm_mrc, val);
311
312 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
313 data->auto_corr_ofdm_x1 =
314 min((u32)ranges->auto_corr_max_ofdm_x1, val);
315
316 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
317 data->auto_corr_ofdm_mrc_x1 =
318 min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
319 }
320
321 /* Else if we got fewer than desired, increase sensitivity */
322 else if (false_alarms < min_false_alarms) {
323
324 IWL_DEBUG_CALIB("norm FA %u < min FA %u\n",
325 false_alarms, min_false_alarms);
326
327 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
328 data->auto_corr_ofdm =
329 max((u32)ranges->auto_corr_min_ofdm, val);
330
331 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
332 data->auto_corr_ofdm_mrc =
333 max((u32)ranges->auto_corr_min_ofdm_mrc, val);
334
335 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
336 data->auto_corr_ofdm_x1 =
337 max((u32)ranges->auto_corr_min_ofdm_x1, val);
338
339 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
340 data->auto_corr_ofdm_mrc_x1 =
341 max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
342 } else {
343 IWL_DEBUG_CALIB("min FA %u < norm FA %u < max FA %u OK\n",
344 min_false_alarms, false_alarms, max_false_alarms);
345 }
346 return 0;
347}
348
349/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
350static int iwl_sensitivity_write(struct iwl_priv *priv)
351{
352 int ret = 0;
353 struct iwl_sensitivity_cmd cmd ;
354 struct iwl_sensitivity_data *data = NULL;
355 struct iwl_host_cmd cmd_out = {
356 .id = SENSITIVITY_CMD,
357 .len = sizeof(struct iwl_sensitivity_cmd),
358 .meta.flags = CMD_ASYNC,
359 .data = &cmd,
360 };
361
362 data = &(priv->sensitivity_data);
363
364 memset(&cmd, 0, sizeof(cmd));
365
366 cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
367 cpu_to_le16((u16)data->auto_corr_ofdm);
368 cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
369 cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
370 cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
371 cpu_to_le16((u16)data->auto_corr_ofdm_x1);
372 cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
373 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
374
375 cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
376 cpu_to_le16((u16)data->auto_corr_cck);
377 cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
378 cpu_to_le16((u16)data->auto_corr_cck_mrc);
379
380 cmd.table[HD_MIN_ENERGY_CCK_DET_INDEX] =
381 cpu_to_le16((u16)data->nrg_th_cck);
382 cmd.table[HD_MIN_ENERGY_OFDM_DET_INDEX] =
383 cpu_to_le16((u16)data->nrg_th_ofdm);
384
385 cmd.table[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
386 __constant_cpu_to_le16(190);
387 cmd.table[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
388 __constant_cpu_to_le16(390);
389 cmd.table[HD_OFDM_ENERGY_TH_IN_INDEX] =
390 __constant_cpu_to_le16(62);
391
392 IWL_DEBUG_CALIB("ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
393 data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
394 data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
395 data->nrg_th_ofdm);
396
397 IWL_DEBUG_CALIB("cck: ac %u mrc %u thresh %u\n",
398 data->auto_corr_cck, data->auto_corr_cck_mrc,
399 data->nrg_th_cck);
400
401 /* Update uCode's "work" table, and copy it to DSP */
402 cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
403
404 /* Don't send command to uCode if nothing has changed */
405 if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
406 sizeof(u16)*HD_TABLE_SIZE)) {
407 IWL_DEBUG_CALIB("No change in SENSITIVITY_CMD\n");
408 return 0;
409 }
410
411 /* Copy table for comparison next time */
412 memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
413 sizeof(u16)*HD_TABLE_SIZE);
414
415 ret = iwl_send_cmd(priv, &cmd_out);
416 if (ret)
417 IWL_ERROR("SENSITIVITY_CMD failed\n");
418
419 return ret;
420}
421
422void iwl_init_sensitivity(struct iwl_priv *priv)
423{
424 int ret = 0;
425 int i;
426 struct iwl_sensitivity_data *data = NULL;
427 const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
428
429 IWL_DEBUG_CALIB("Start iwl_init_sensitivity\n");
430
431 /* Clear driver's sensitivity algo data */
432 data = &(priv->sensitivity_data);
433
434 if (ranges == NULL)
435 /* can happen if IWLWIFI_RUN_TIME_CALIB is selected
436 * but no IWLXXXX_RUN_TIME_CALIB for specific is selected */
437 return;
438
439 memset(data, 0, sizeof(struct iwl_sensitivity_data));
440
441 data->num_in_cck_no_fa = 0;
442 data->nrg_curr_state = IWL_FA_TOO_MANY;
443 data->nrg_prev_state = IWL_FA_TOO_MANY;
444 data->nrg_silence_ref = 0;
445 data->nrg_silence_idx = 0;
446 data->nrg_energy_idx = 0;
447
448 for (i = 0; i < 10; i++)
449 data->nrg_value[i] = 0;
450
451 for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
452 data->nrg_silence_rssi[i] = 0;
453
454 data->auto_corr_ofdm = 90;
455 data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
456 data->auto_corr_ofdm_x1 = ranges->auto_corr_min_ofdm_x1;
457 data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
458 data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
459 data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
460 data->nrg_th_cck = ranges->nrg_th_cck;
461 data->nrg_th_ofdm = ranges->nrg_th_ofdm;
462
463 data->last_bad_plcp_cnt_ofdm = 0;
464 data->last_fa_cnt_ofdm = 0;
465 data->last_bad_plcp_cnt_cck = 0;
466 data->last_fa_cnt_cck = 0;
467
468 ret |= iwl_sensitivity_write(priv);
469 IWL_DEBUG_CALIB("<<return 0x%X\n", ret);
470}
471EXPORT_SYMBOL(iwl_init_sensitivity);
472
473void iwl_sensitivity_calibration(struct iwl_priv *priv,
474 struct iwl4965_notif_statistics *resp)
475{
476 u32 rx_enable_time;
477 u32 fa_cck;
478 u32 fa_ofdm;
479 u32 bad_plcp_cck;
480 u32 bad_plcp_ofdm;
481 u32 norm_fa_ofdm;
482 u32 norm_fa_cck;
483 struct iwl_sensitivity_data *data = NULL;
484 struct statistics_rx_non_phy *rx_info = &(resp->rx.general);
485 struct statistics_rx *statistics = &(resp->rx);
486 unsigned long flags;
487 struct statistics_general_data statis;
488
489 data = &(priv->sensitivity_data);
490
491 if (!iwl_is_associated(priv)) {
492 IWL_DEBUG_CALIB("<< - not associated\n");
493 return;
494 }
495
496 spin_lock_irqsave(&priv->lock, flags);
497 if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
498 IWL_DEBUG_CALIB("<< invalid data.\n");
499 spin_unlock_irqrestore(&priv->lock, flags);
500 return;
501 }
502
503 /* Extract Statistics: */
504 rx_enable_time = le32_to_cpu(rx_info->channel_load);
505 fa_cck = le32_to_cpu(statistics->cck.false_alarm_cnt);
506 fa_ofdm = le32_to_cpu(statistics->ofdm.false_alarm_cnt);
507 bad_plcp_cck = le32_to_cpu(statistics->cck.plcp_err);
508 bad_plcp_ofdm = le32_to_cpu(statistics->ofdm.plcp_err);
509
510 statis.beacon_silence_rssi_a =
511 le32_to_cpu(statistics->general.beacon_silence_rssi_a);
512 statis.beacon_silence_rssi_b =
513 le32_to_cpu(statistics->general.beacon_silence_rssi_b);
514 statis.beacon_silence_rssi_c =
515 le32_to_cpu(statistics->general.beacon_silence_rssi_c);
516 statis.beacon_energy_a =
517 le32_to_cpu(statistics->general.beacon_energy_a);
518 statis.beacon_energy_b =
519 le32_to_cpu(statistics->general.beacon_energy_b);
520 statis.beacon_energy_c =
521 le32_to_cpu(statistics->general.beacon_energy_c);
522
523 spin_unlock_irqrestore(&priv->lock, flags);
524
525 IWL_DEBUG_CALIB("rx_enable_time = %u usecs\n", rx_enable_time);
526
527 if (!rx_enable_time) {
528 IWL_DEBUG_CALIB("<< RX Enable Time == 0! \n");
529 return;
530 }
531
532 /* These statistics increase monotonically, and do not reset
533 * at each beacon. Calculate difference from last value, or just
534 * use the new statistics value if it has reset or wrapped around. */
535 if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
536 data->last_bad_plcp_cnt_cck = bad_plcp_cck;
537 else {
538 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
539 data->last_bad_plcp_cnt_cck += bad_plcp_cck;
540 }
541
542 if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
543 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
544 else {
545 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
546 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
547 }
548
549 if (data->last_fa_cnt_ofdm > fa_ofdm)
550 data->last_fa_cnt_ofdm = fa_ofdm;
551 else {
552 fa_ofdm -= data->last_fa_cnt_ofdm;
553 data->last_fa_cnt_ofdm += fa_ofdm;
554 }
555
556 if (data->last_fa_cnt_cck > fa_cck)
557 data->last_fa_cnt_cck = fa_cck;
558 else {
559 fa_cck -= data->last_fa_cnt_cck;
560 data->last_fa_cnt_cck += fa_cck;
561 }
562
563 /* Total aborted signal locks */
564 norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
565 norm_fa_cck = fa_cck + bad_plcp_cck;
566
567 IWL_DEBUG_CALIB("cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck,
568 bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
569
570 iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
571 iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
572 iwl_sensitivity_write(priv);
573
574 return;
575}
576EXPORT_SYMBOL(iwl_sensitivity_calibration);
577
578/*
579 * Accumulate 20 beacons of signal and noise statistics for each of
580 * 3 receivers/antennas/rx-chains, then figure out:
581 * 1) Which antennas are connected.
582 * 2) Differential rx gain settings to balance the 3 receivers.
583 */
584void iwl_chain_noise_calibration(struct iwl_priv *priv,
585 struct iwl4965_notif_statistics *stat_resp)
586{
587 struct iwl_chain_noise_data *data = NULL;
588
589 u32 chain_noise_a;
590 u32 chain_noise_b;
591 u32 chain_noise_c;
592 u32 chain_sig_a;
593 u32 chain_sig_b;
594 u32 chain_sig_c;
595 u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
596 u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
597 u32 max_average_sig;
598 u16 max_average_sig_antenna_i;
599 u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
600 u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
601 u16 i = 0;
602 u16 rxon_chnum = INITIALIZATION_VALUE;
603 u16 stat_chnum = INITIALIZATION_VALUE;
604 u8 rxon_band24;
605 u8 stat_band24;
606 u32 active_chains = 0;
607 u8 num_tx_chains;
608 unsigned long flags;
609 struct statistics_rx_non_phy *rx_info = &(stat_resp->rx.general);
610
611 data = &(priv->chain_noise_data);
612
613 /* Accumulate just the first 20 beacons after the first association,
614 * then we're done forever. */
615 if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
616 if (data->state == IWL_CHAIN_NOISE_ALIVE)
617 IWL_DEBUG_CALIB("Wait for noise calib reset\n");
618 return;
619 }
620
621 spin_lock_irqsave(&priv->lock, flags);
622 if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
623 IWL_DEBUG_CALIB(" << Interference data unavailable\n");
624 spin_unlock_irqrestore(&priv->lock, flags);
625 return;
626 }
627
628 rxon_band24 = !!(priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK);
629 rxon_chnum = le16_to_cpu(priv->staging_rxon.channel);
630 stat_band24 = !!(stat_resp->flag & STATISTICS_REPLY_FLG_BAND_24G_MSK);
631 stat_chnum = le32_to_cpu(stat_resp->flag) >> 16;
632
633 /* Make sure we accumulate data for just the associated channel
634 * (even if scanning). */
635 if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
636 IWL_DEBUG_CALIB("Stats not from chan=%d, band24=%d\n",
637 rxon_chnum, rxon_band24);
638 spin_unlock_irqrestore(&priv->lock, flags);
639 return;
640 }
641
642 /* Accumulate beacon statistics values across 20 beacons */
643 chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
644 IN_BAND_FILTER;
645 chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
646 IN_BAND_FILTER;
647 chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
648 IN_BAND_FILTER;
649
650 chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
651 chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
652 chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
653
654 spin_unlock_irqrestore(&priv->lock, flags);
655
656 data->beacon_count++;
657
658 data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
659 data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
660 data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
661
662 data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
663 data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
664 data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
665
666 IWL_DEBUG_CALIB("chan=%d, band24=%d, beacon=%d\n",
667 rxon_chnum, rxon_band24, data->beacon_count);
668 IWL_DEBUG_CALIB("chain_sig: a %d b %d c %d\n",
669 chain_sig_a, chain_sig_b, chain_sig_c);
670 IWL_DEBUG_CALIB("chain_noise: a %d b %d c %d\n",
671 chain_noise_a, chain_noise_b, chain_noise_c);
672
673 /* If this is the 20th beacon, determine:
674 * 1) Disconnected antennas (using signal strengths)
675 * 2) Differential gain (using silence noise) to balance receivers */
676 if (data->beacon_count != CAL_NUM_OF_BEACONS)
677 return;
678
679 /* Analyze signal for disconnected antenna */
680 average_sig[0] = (data->chain_signal_a) / CAL_NUM_OF_BEACONS;
681 average_sig[1] = (data->chain_signal_b) / CAL_NUM_OF_BEACONS;
682 average_sig[2] = (data->chain_signal_c) / CAL_NUM_OF_BEACONS;
683
684 if (average_sig[0] >= average_sig[1]) {
685 max_average_sig = average_sig[0];
686 max_average_sig_antenna_i = 0;
687 active_chains = (1 << max_average_sig_antenna_i);
688 } else {
689 max_average_sig = average_sig[1];
690 max_average_sig_antenna_i = 1;
691 active_chains = (1 << max_average_sig_antenna_i);
692 }
693
694 if (average_sig[2] >= max_average_sig) {
695 max_average_sig = average_sig[2];
696 max_average_sig_antenna_i = 2;
697 active_chains = (1 << max_average_sig_antenna_i);
698 }
699
700 IWL_DEBUG_CALIB("average_sig: a %d b %d c %d\n",
701 average_sig[0], average_sig[1], average_sig[2]);
702 IWL_DEBUG_CALIB("max_average_sig = %d, antenna %d\n",
703 max_average_sig, max_average_sig_antenna_i);
704
705 /* Compare signal strengths for all 3 receivers. */
706 for (i = 0; i < NUM_RX_CHAINS; i++) {
707 if (i != max_average_sig_antenna_i) {
708 s32 rssi_delta = (max_average_sig - average_sig[i]);
709
710 /* If signal is very weak, compared with
711 * strongest, mark it as disconnected. */
712 if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
713 data->disconn_array[i] = 1;
714 else
715 active_chains |= (1 << i);
716 IWL_DEBUG_CALIB("i = %d rssiDelta = %d "
717 "disconn_array[i] = %d\n",
718 i, rssi_delta, data->disconn_array[i]);
719 }
720 }
721
722 num_tx_chains = 0;
723 for (i = 0; i < NUM_RX_CHAINS; i++) {
724 /* loops on all the bits of
725 * priv->hw_setting.valid_tx_ant */
726 u8 ant_msk = (1 << i);
727 if (!(priv->hw_params.valid_tx_ant & ant_msk))
728 continue;
729
730 num_tx_chains++;
731 if (data->disconn_array[i] == 0)
732 /* there is a Tx antenna connected */
733 break;
734 if (num_tx_chains == priv->hw_params.tx_chains_num &&
735 data->disconn_array[i]) {
736 /* This is the last TX antenna and is also
737 * disconnected connect it anyway */
738 data->disconn_array[i] = 0;
739 active_chains |= ant_msk;
740 IWL_DEBUG_CALIB("All Tx chains are disconnected W/A - "
741 "declare %d as connected\n", i);
742 break;
743 }
744 }
745
746 IWL_DEBUG_CALIB("active_chains (bitwise) = 0x%x\n",
747 active_chains);
748
749 /* Save for use within RXON, TX, SCAN commands, etc. */
750 priv->valid_antenna = active_chains;
751
752 /* Analyze noise for rx balance */
753 average_noise[0] = ((data->chain_noise_a)/CAL_NUM_OF_BEACONS);
754 average_noise[1] = ((data->chain_noise_b)/CAL_NUM_OF_BEACONS);
755 average_noise[2] = ((data->chain_noise_c)/CAL_NUM_OF_BEACONS);
756
757 for (i = 0; i < NUM_RX_CHAINS; i++) {
758 if (!(data->disconn_array[i]) &&
759 (average_noise[i] <= min_average_noise)) {
760 /* This means that chain i is active and has
761 * lower noise values so far: */
762 min_average_noise = average_noise[i];
763 min_average_noise_antenna_i = i;
764 }
765 }
766
767 IWL_DEBUG_CALIB("average_noise: a %d b %d c %d\n",
768 average_noise[0], average_noise[1],
769 average_noise[2]);
770
771 IWL_DEBUG_CALIB("min_average_noise = %d, antenna %d\n",
772 min_average_noise, min_average_noise_antenna_i);
773
774 priv->cfg->ops->utils->gain_computation(priv, average_noise,
775 min_average_noise_antenna_i, min_average_noise);
776}
777EXPORT_SYMBOL(iwl_chain_noise_calibration);
778
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-30 14:51:07 -0500