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f0832f13 EG |
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 | ||
3e0d4cb1 | 66 | #include "iwl-dev.h" |
f0832f13 EG |
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. */ | |
79 | static 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 | ||
285 | static 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 */ | |
350 | static 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 | ||
422 | void 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 | ||
445c2dff TW |
429 | if (priv->disable_sens_cal) |
430 | return; | |
431 | ||
f0832f13 EG |
432 | IWL_DEBUG_CALIB("Start iwl_init_sensitivity\n"); |
433 | ||
434 | /* Clear driver's sensitivity algo data */ | |
435 | data = &(priv->sensitivity_data); | |
436 | ||
437 | if (ranges == NULL) | |
438 | /* can happen if IWLWIFI_RUN_TIME_CALIB is selected | |
439 | * but no IWLXXXX_RUN_TIME_CALIB for specific is selected */ | |
440 | return; | |
441 | ||
442 | memset(data, 0, sizeof(struct iwl_sensitivity_data)); | |
443 | ||
444 | data->num_in_cck_no_fa = 0; | |
445 | data->nrg_curr_state = IWL_FA_TOO_MANY; | |
446 | data->nrg_prev_state = IWL_FA_TOO_MANY; | |
447 | data->nrg_silence_ref = 0; | |
448 | data->nrg_silence_idx = 0; | |
449 | data->nrg_energy_idx = 0; | |
450 | ||
451 | for (i = 0; i < 10; i++) | |
452 | data->nrg_value[i] = 0; | |
453 | ||
454 | for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) | |
455 | data->nrg_silence_rssi[i] = 0; | |
456 | ||
457 | data->auto_corr_ofdm = 90; | |
458 | data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc; | |
459 | data->auto_corr_ofdm_x1 = ranges->auto_corr_min_ofdm_x1; | |
460 | data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1; | |
461 | data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF; | |
462 | data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc; | |
463 | data->nrg_th_cck = ranges->nrg_th_cck; | |
464 | data->nrg_th_ofdm = ranges->nrg_th_ofdm; | |
465 | ||
466 | data->last_bad_plcp_cnt_ofdm = 0; | |
467 | data->last_fa_cnt_ofdm = 0; | |
468 | data->last_bad_plcp_cnt_cck = 0; | |
469 | data->last_fa_cnt_cck = 0; | |
470 | ||
471 | ret |= iwl_sensitivity_write(priv); | |
472 | IWL_DEBUG_CALIB("<<return 0x%X\n", ret); | |
473 | } | |
474 | EXPORT_SYMBOL(iwl_init_sensitivity); | |
475 | ||
476 | void iwl_sensitivity_calibration(struct iwl_priv *priv, | |
477 | struct iwl4965_notif_statistics *resp) | |
478 | { | |
479 | u32 rx_enable_time; | |
480 | u32 fa_cck; | |
481 | u32 fa_ofdm; | |
482 | u32 bad_plcp_cck; | |
483 | u32 bad_plcp_ofdm; | |
484 | u32 norm_fa_ofdm; | |
485 | u32 norm_fa_cck; | |
486 | struct iwl_sensitivity_data *data = NULL; | |
487 | struct statistics_rx_non_phy *rx_info = &(resp->rx.general); | |
488 | struct statistics_rx *statistics = &(resp->rx); | |
489 | unsigned long flags; | |
490 | struct statistics_general_data statis; | |
491 | ||
445c2dff TW |
492 | if (priv->disable_sens_cal) |
493 | return; | |
494 | ||
f0832f13 EG |
495 | data = &(priv->sensitivity_data); |
496 | ||
497 | if (!iwl_is_associated(priv)) { | |
498 | IWL_DEBUG_CALIB("<< - not associated\n"); | |
499 | return; | |
500 | } | |
501 | ||
502 | spin_lock_irqsave(&priv->lock, flags); | |
503 | if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) { | |
504 | IWL_DEBUG_CALIB("<< invalid data.\n"); | |
505 | spin_unlock_irqrestore(&priv->lock, flags); | |
506 | return; | |
507 | } | |
508 | ||
509 | /* Extract Statistics: */ | |
510 | rx_enable_time = le32_to_cpu(rx_info->channel_load); | |
511 | fa_cck = le32_to_cpu(statistics->cck.false_alarm_cnt); | |
512 | fa_ofdm = le32_to_cpu(statistics->ofdm.false_alarm_cnt); | |
513 | bad_plcp_cck = le32_to_cpu(statistics->cck.plcp_err); | |
514 | bad_plcp_ofdm = le32_to_cpu(statistics->ofdm.plcp_err); | |
515 | ||
516 | statis.beacon_silence_rssi_a = | |
517 | le32_to_cpu(statistics->general.beacon_silence_rssi_a); | |
518 | statis.beacon_silence_rssi_b = | |
519 | le32_to_cpu(statistics->general.beacon_silence_rssi_b); | |
520 | statis.beacon_silence_rssi_c = | |
521 | le32_to_cpu(statistics->general.beacon_silence_rssi_c); | |
522 | statis.beacon_energy_a = | |
523 | le32_to_cpu(statistics->general.beacon_energy_a); | |
524 | statis.beacon_energy_b = | |
525 | le32_to_cpu(statistics->general.beacon_energy_b); | |
526 | statis.beacon_energy_c = | |
527 | le32_to_cpu(statistics->general.beacon_energy_c); | |
528 | ||
529 | spin_unlock_irqrestore(&priv->lock, flags); | |
530 | ||
531 | IWL_DEBUG_CALIB("rx_enable_time = %u usecs\n", rx_enable_time); | |
532 | ||
533 | if (!rx_enable_time) { | |
534 | IWL_DEBUG_CALIB("<< RX Enable Time == 0! \n"); | |
535 | return; | |
536 | } | |
537 | ||
538 | /* These statistics increase monotonically, and do not reset | |
539 | * at each beacon. Calculate difference from last value, or just | |
540 | * use the new statistics value if it has reset or wrapped around. */ | |
541 | if (data->last_bad_plcp_cnt_cck > bad_plcp_cck) | |
542 | data->last_bad_plcp_cnt_cck = bad_plcp_cck; | |
543 | else { | |
544 | bad_plcp_cck -= data->last_bad_plcp_cnt_cck; | |
545 | data->last_bad_plcp_cnt_cck += bad_plcp_cck; | |
546 | } | |
547 | ||
548 | if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm) | |
549 | data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm; | |
550 | else { | |
551 | bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm; | |
552 | data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm; | |
553 | } | |
554 | ||
555 | if (data->last_fa_cnt_ofdm > fa_ofdm) | |
556 | data->last_fa_cnt_ofdm = fa_ofdm; | |
557 | else { | |
558 | fa_ofdm -= data->last_fa_cnt_ofdm; | |
559 | data->last_fa_cnt_ofdm += fa_ofdm; | |
560 | } | |
561 | ||
562 | if (data->last_fa_cnt_cck > fa_cck) | |
563 | data->last_fa_cnt_cck = fa_cck; | |
564 | else { | |
565 | fa_cck -= data->last_fa_cnt_cck; | |
566 | data->last_fa_cnt_cck += fa_cck; | |
567 | } | |
568 | ||
569 | /* Total aborted signal locks */ | |
570 | norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm; | |
571 | norm_fa_cck = fa_cck + bad_plcp_cck; | |
572 | ||
573 | IWL_DEBUG_CALIB("cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck, | |
574 | bad_plcp_cck, fa_ofdm, bad_plcp_ofdm); | |
575 | ||
576 | iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time); | |
577 | iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis); | |
578 | iwl_sensitivity_write(priv); | |
579 | ||
580 | return; | |
581 | } | |
582 | EXPORT_SYMBOL(iwl_sensitivity_calibration); | |
583 | ||
584 | /* | |
585 | * Accumulate 20 beacons of signal and noise statistics for each of | |
586 | * 3 receivers/antennas/rx-chains, then figure out: | |
587 | * 1) Which antennas are connected. | |
588 | * 2) Differential rx gain settings to balance the 3 receivers. | |
589 | */ | |
590 | void iwl_chain_noise_calibration(struct iwl_priv *priv, | |
591 | struct iwl4965_notif_statistics *stat_resp) | |
592 | { | |
593 | struct iwl_chain_noise_data *data = NULL; | |
594 | ||
595 | u32 chain_noise_a; | |
596 | u32 chain_noise_b; | |
597 | u32 chain_noise_c; | |
598 | u32 chain_sig_a; | |
599 | u32 chain_sig_b; | |
600 | u32 chain_sig_c; | |
601 | u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE}; | |
602 | u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE}; | |
603 | u32 max_average_sig; | |
604 | u16 max_average_sig_antenna_i; | |
605 | u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE; | |
606 | u16 min_average_noise_antenna_i = INITIALIZATION_VALUE; | |
607 | u16 i = 0; | |
608 | u16 rxon_chnum = INITIALIZATION_VALUE; | |
609 | u16 stat_chnum = INITIALIZATION_VALUE; | |
610 | u8 rxon_band24; | |
611 | u8 stat_band24; | |
612 | u32 active_chains = 0; | |
613 | u8 num_tx_chains; | |
614 | unsigned long flags; | |
615 | struct statistics_rx_non_phy *rx_info = &(stat_resp->rx.general); | |
616 | ||
445c2dff TW |
617 | if (priv->disable_chain_noise_cal) |
618 | return; | |
619 | ||
f0832f13 EG |
620 | data = &(priv->chain_noise_data); |
621 | ||
622 | /* Accumulate just the first 20 beacons after the first association, | |
623 | * then we're done forever. */ | |
624 | if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) { | |
625 | if (data->state == IWL_CHAIN_NOISE_ALIVE) | |
626 | IWL_DEBUG_CALIB("Wait for noise calib reset\n"); | |
627 | return; | |
628 | } | |
629 | ||
630 | spin_lock_irqsave(&priv->lock, flags); | |
631 | if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) { | |
632 | IWL_DEBUG_CALIB(" << Interference data unavailable\n"); | |
633 | spin_unlock_irqrestore(&priv->lock, flags); | |
634 | return; | |
635 | } | |
636 | ||
637 | rxon_band24 = !!(priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK); | |
638 | rxon_chnum = le16_to_cpu(priv->staging_rxon.channel); | |
639 | stat_band24 = !!(stat_resp->flag & STATISTICS_REPLY_FLG_BAND_24G_MSK); | |
640 | stat_chnum = le32_to_cpu(stat_resp->flag) >> 16; | |
641 | ||
642 | /* Make sure we accumulate data for just the associated channel | |
643 | * (even if scanning). */ | |
644 | if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) { | |
645 | IWL_DEBUG_CALIB("Stats not from chan=%d, band24=%d\n", | |
646 | rxon_chnum, rxon_band24); | |
647 | spin_unlock_irqrestore(&priv->lock, flags); | |
648 | return; | |
649 | } | |
650 | ||
651 | /* Accumulate beacon statistics values across 20 beacons */ | |
652 | chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) & | |
653 | IN_BAND_FILTER; | |
654 | chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) & | |
655 | IN_BAND_FILTER; | |
656 | chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) & | |
657 | IN_BAND_FILTER; | |
658 | ||
659 | chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER; | |
660 | chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER; | |
661 | chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER; | |
662 | ||
663 | spin_unlock_irqrestore(&priv->lock, flags); | |
664 | ||
665 | data->beacon_count++; | |
666 | ||
667 | data->chain_noise_a = (chain_noise_a + data->chain_noise_a); | |
668 | data->chain_noise_b = (chain_noise_b + data->chain_noise_b); | |
669 | data->chain_noise_c = (chain_noise_c + data->chain_noise_c); | |
670 | ||
671 | data->chain_signal_a = (chain_sig_a + data->chain_signal_a); | |
672 | data->chain_signal_b = (chain_sig_b + data->chain_signal_b); | |
673 | data->chain_signal_c = (chain_sig_c + data->chain_signal_c); | |
674 | ||
675 | IWL_DEBUG_CALIB("chan=%d, band24=%d, beacon=%d\n", | |
676 | rxon_chnum, rxon_band24, data->beacon_count); | |
677 | IWL_DEBUG_CALIB("chain_sig: a %d b %d c %d\n", | |
678 | chain_sig_a, chain_sig_b, chain_sig_c); | |
679 | IWL_DEBUG_CALIB("chain_noise: a %d b %d c %d\n", | |
680 | chain_noise_a, chain_noise_b, chain_noise_c); | |
681 | ||
682 | /* If this is the 20th beacon, determine: | |
683 | * 1) Disconnected antennas (using signal strengths) | |
684 | * 2) Differential gain (using silence noise) to balance receivers */ | |
685 | if (data->beacon_count != CAL_NUM_OF_BEACONS) | |
686 | return; | |
687 | ||
688 | /* Analyze signal for disconnected antenna */ | |
689 | average_sig[0] = (data->chain_signal_a) / CAL_NUM_OF_BEACONS; | |
690 | average_sig[1] = (data->chain_signal_b) / CAL_NUM_OF_BEACONS; | |
691 | average_sig[2] = (data->chain_signal_c) / CAL_NUM_OF_BEACONS; | |
692 | ||
693 | if (average_sig[0] >= average_sig[1]) { | |
694 | max_average_sig = average_sig[0]; | |
695 | max_average_sig_antenna_i = 0; | |
696 | active_chains = (1 << max_average_sig_antenna_i); | |
697 | } else { | |
698 | max_average_sig = average_sig[1]; | |
699 | max_average_sig_antenna_i = 1; | |
700 | active_chains = (1 << max_average_sig_antenna_i); | |
701 | } | |
702 | ||
703 | if (average_sig[2] >= max_average_sig) { | |
704 | max_average_sig = average_sig[2]; | |
705 | max_average_sig_antenna_i = 2; | |
706 | active_chains = (1 << max_average_sig_antenna_i); | |
707 | } | |
708 | ||
709 | IWL_DEBUG_CALIB("average_sig: a %d b %d c %d\n", | |
710 | average_sig[0], average_sig[1], average_sig[2]); | |
711 | IWL_DEBUG_CALIB("max_average_sig = %d, antenna %d\n", | |
712 | max_average_sig, max_average_sig_antenna_i); | |
713 | ||
714 | /* Compare signal strengths for all 3 receivers. */ | |
715 | for (i = 0; i < NUM_RX_CHAINS; i++) { | |
716 | if (i != max_average_sig_antenna_i) { | |
717 | s32 rssi_delta = (max_average_sig - average_sig[i]); | |
718 | ||
719 | /* If signal is very weak, compared with | |
720 | * strongest, mark it as disconnected. */ | |
721 | if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS) | |
722 | data->disconn_array[i] = 1; | |
723 | else | |
724 | active_chains |= (1 << i); | |
725 | IWL_DEBUG_CALIB("i = %d rssiDelta = %d " | |
726 | "disconn_array[i] = %d\n", | |
727 | i, rssi_delta, data->disconn_array[i]); | |
728 | } | |
729 | } | |
730 | ||
731 | num_tx_chains = 0; | |
732 | for (i = 0; i < NUM_RX_CHAINS; i++) { | |
733 | /* loops on all the bits of | |
734 | * priv->hw_setting.valid_tx_ant */ | |
735 | u8 ant_msk = (1 << i); | |
736 | if (!(priv->hw_params.valid_tx_ant & ant_msk)) | |
737 | continue; | |
738 | ||
739 | num_tx_chains++; | |
740 | if (data->disconn_array[i] == 0) | |
741 | /* there is a Tx antenna connected */ | |
742 | break; | |
743 | if (num_tx_chains == priv->hw_params.tx_chains_num && | |
744 | data->disconn_array[i]) { | |
745 | /* This is the last TX antenna and is also | |
746 | * disconnected connect it anyway */ | |
747 | data->disconn_array[i] = 0; | |
748 | active_chains |= ant_msk; | |
749 | IWL_DEBUG_CALIB("All Tx chains are disconnected W/A - " | |
750 | "declare %d as connected\n", i); | |
751 | break; | |
752 | } | |
753 | } | |
754 | ||
755 | IWL_DEBUG_CALIB("active_chains (bitwise) = 0x%x\n", | |
756 | active_chains); | |
757 | ||
758 | /* Save for use within RXON, TX, SCAN commands, etc. */ | |
fde0db31 GC |
759 | /*priv->valid_antenna = active_chains;*/ |
760 | /*FIXME: should be reflected in RX chains in RXON */ | |
f0832f13 EG |
761 | |
762 | /* Analyze noise for rx balance */ | |
763 | average_noise[0] = ((data->chain_noise_a)/CAL_NUM_OF_BEACONS); | |
764 | average_noise[1] = ((data->chain_noise_b)/CAL_NUM_OF_BEACONS); | |
765 | average_noise[2] = ((data->chain_noise_c)/CAL_NUM_OF_BEACONS); | |
766 | ||
767 | for (i = 0; i < NUM_RX_CHAINS; i++) { | |
768 | if (!(data->disconn_array[i]) && | |
769 | (average_noise[i] <= min_average_noise)) { | |
770 | /* This means that chain i is active and has | |
771 | * lower noise values so far: */ | |
772 | min_average_noise = average_noise[i]; | |
773 | min_average_noise_antenna_i = i; | |
774 | } | |
775 | } | |
776 | ||
777 | IWL_DEBUG_CALIB("average_noise: a %d b %d c %d\n", | |
778 | average_noise[0], average_noise[1], | |
779 | average_noise[2]); | |
780 | ||
781 | IWL_DEBUG_CALIB("min_average_noise = %d, antenna %d\n", | |
782 | min_average_noise, min_average_noise_antenna_i); | |
783 | ||
784 | priv->cfg->ops->utils->gain_computation(priv, average_noise, | |
785 | min_average_noise_antenna_i, min_average_noise); | |
786 | } | |
787 | EXPORT_SYMBOL(iwl_chain_noise_calibration); | |
788 |