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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: | |
759ef89f | 28 | * Intel Linux Wireless <ilw@linux.intel.com> |
f0832f13 EG |
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 | ||
f0832f13 EG |
63 | #include <net/mac80211.h> |
64 | ||
3e0d4cb1 | 65 | #include "iwl-dev.h" |
f0832f13 EG |
66 | #include "iwl-core.h" |
67 | #include "iwl-calib.h" | |
f0832f13 | 68 | |
6e21f2c1 TW |
69 | /***************************************************************************** |
70 | * INIT calibrations framework | |
71 | *****************************************************************************/ | |
72 | ||
be5d56ed | 73 | int iwl_send_calib_results(struct iwl_priv *priv) |
6e21f2c1 TW |
74 | { |
75 | int ret = 0; | |
76 | int i = 0; | |
77 | ||
78 | struct iwl_host_cmd hcmd = { | |
79 | .id = REPLY_PHY_CALIBRATION_CMD, | |
80 | .meta.flags = CMD_SIZE_HUGE, | |
81 | }; | |
82 | ||
be5d56ed TW |
83 | for (i = 0; i < IWL_CALIB_MAX; i++) { |
84 | if ((BIT(i) & priv->hw_params.calib_init_cfg) && | |
85 | priv->calib_results[i].buf) { | |
6e21f2c1 TW |
86 | hcmd.len = priv->calib_results[i].buf_len; |
87 | hcmd.data = priv->calib_results[i].buf; | |
88 | ret = iwl_send_cmd_sync(priv, &hcmd); | |
89 | if (ret) | |
90 | goto err; | |
91 | } | |
be5d56ed | 92 | } |
6e21f2c1 TW |
93 | |
94 | return 0; | |
95 | err: | |
96 | IWL_ERROR("Error %d iteration %d\n", ret, i); | |
97 | return ret; | |
98 | } | |
99 | EXPORT_SYMBOL(iwl_send_calib_results); | |
100 | ||
101 | int iwl_calib_set(struct iwl_calib_result *res, const u8 *buf, int len) | |
102 | { | |
103 | if (res->buf_len != len) { | |
104 | kfree(res->buf); | |
105 | res->buf = kzalloc(len, GFP_ATOMIC); | |
106 | } | |
107 | if (unlikely(res->buf == NULL)) | |
108 | return -ENOMEM; | |
109 | ||
110 | res->buf_len = len; | |
111 | memcpy(res->buf, buf, len); | |
112 | return 0; | |
113 | } | |
114 | EXPORT_SYMBOL(iwl_calib_set); | |
115 | ||
116 | void iwl_calib_free_results(struct iwl_priv *priv) | |
117 | { | |
118 | int i; | |
119 | ||
120 | for (i = 0; i < IWL_CALIB_MAX; i++) { | |
121 | kfree(priv->calib_results[i].buf); | |
122 | priv->calib_results[i].buf = NULL; | |
123 | priv->calib_results[i].buf_len = 0; | |
124 | } | |
125 | } | |
126 | ||
127 | /***************************************************************************** | |
128 | * RUNTIME calibrations framework | |
129 | *****************************************************************************/ | |
130 | ||
f0832f13 EG |
131 | /* "false alarms" are signals that our DSP tries to lock onto, |
132 | * but then determines that they are either noise, or transmissions | |
133 | * from a distant wireless network (also "noise", really) that get | |
134 | * "stepped on" by stronger transmissions within our own network. | |
135 | * This algorithm attempts to set a sensitivity level that is high | |
136 | * enough to receive all of our own network traffic, but not so | |
137 | * high that our DSP gets too busy trying to lock onto non-network | |
138 | * activity/noise. */ | |
139 | static int iwl_sens_energy_cck(struct iwl_priv *priv, | |
140 | u32 norm_fa, | |
141 | u32 rx_enable_time, | |
142 | struct statistics_general_data *rx_info) | |
143 | { | |
144 | u32 max_nrg_cck = 0; | |
145 | int i = 0; | |
146 | u8 max_silence_rssi = 0; | |
147 | u32 silence_ref = 0; | |
148 | u8 silence_rssi_a = 0; | |
149 | u8 silence_rssi_b = 0; | |
150 | u8 silence_rssi_c = 0; | |
151 | u32 val; | |
152 | ||
153 | /* "false_alarms" values below are cross-multiplications to assess the | |
154 | * numbers of false alarms within the measured period of actual Rx | |
155 | * (Rx is off when we're txing), vs the min/max expected false alarms | |
156 | * (some should be expected if rx is sensitive enough) in a | |
157 | * hypothetical listening period of 200 time units (TU), 204.8 msec: | |
158 | * | |
159 | * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time | |
160 | * | |
161 | * */ | |
162 | u32 false_alarms = norm_fa * 200 * 1024; | |
163 | u32 max_false_alarms = MAX_FA_CCK * rx_enable_time; | |
164 | u32 min_false_alarms = MIN_FA_CCK * rx_enable_time; | |
165 | struct iwl_sensitivity_data *data = NULL; | |
166 | const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens; | |
167 | ||
168 | data = &(priv->sensitivity_data); | |
169 | ||
170 | data->nrg_auto_corr_silence_diff = 0; | |
171 | ||
172 | /* Find max silence rssi among all 3 receivers. | |
173 | * This is background noise, which may include transmissions from other | |
174 | * networks, measured during silence before our network's beacon */ | |
175 | silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a & | |
176 | ALL_BAND_FILTER) >> 8); | |
177 | silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b & | |
178 | ALL_BAND_FILTER) >> 8); | |
179 | silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c & | |
180 | ALL_BAND_FILTER) >> 8); | |
181 | ||
182 | val = max(silence_rssi_b, silence_rssi_c); | |
183 | max_silence_rssi = max(silence_rssi_a, (u8) val); | |
184 | ||
185 | /* Store silence rssi in 20-beacon history table */ | |
186 | data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi; | |
187 | data->nrg_silence_idx++; | |
188 | if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L) | |
189 | data->nrg_silence_idx = 0; | |
190 | ||
191 | /* Find max silence rssi across 20 beacon history */ | |
192 | for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) { | |
193 | val = data->nrg_silence_rssi[i]; | |
194 | silence_ref = max(silence_ref, val); | |
195 | } | |
196 | IWL_DEBUG_CALIB("silence a %u, b %u, c %u, 20-bcn max %u\n", | |
197 | silence_rssi_a, silence_rssi_b, silence_rssi_c, | |
198 | silence_ref); | |
199 | ||
200 | /* Find max rx energy (min value!) among all 3 receivers, | |
201 | * measured during beacon frame. | |
202 | * Save it in 10-beacon history table. */ | |
203 | i = data->nrg_energy_idx; | |
204 | val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c); | |
205 | data->nrg_value[i] = min(rx_info->beacon_energy_a, val); | |
206 | ||
207 | data->nrg_energy_idx++; | |
208 | if (data->nrg_energy_idx >= 10) | |
209 | data->nrg_energy_idx = 0; | |
210 | ||
211 | /* Find min rx energy (max value) across 10 beacon history. | |
212 | * This is the minimum signal level that we want to receive well. | |
213 | * Add backoff (margin so we don't miss slightly lower energy frames). | |
214 | * This establishes an upper bound (min value) for energy threshold. */ | |
215 | max_nrg_cck = data->nrg_value[0]; | |
216 | for (i = 1; i < 10; i++) | |
217 | max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i])); | |
218 | max_nrg_cck += 6; | |
219 | ||
220 | IWL_DEBUG_CALIB("rx energy a %u, b %u, c %u, 10-bcn max/min %u\n", | |
221 | rx_info->beacon_energy_a, rx_info->beacon_energy_b, | |
222 | rx_info->beacon_energy_c, max_nrg_cck - 6); | |
223 | ||
224 | /* Count number of consecutive beacons with fewer-than-desired | |
225 | * false alarms. */ | |
226 | if (false_alarms < min_false_alarms) | |
227 | data->num_in_cck_no_fa++; | |
228 | else | |
229 | data->num_in_cck_no_fa = 0; | |
230 | IWL_DEBUG_CALIB("consecutive bcns with few false alarms = %u\n", | |
231 | data->num_in_cck_no_fa); | |
232 | ||
233 | /* If we got too many false alarms this time, reduce sensitivity */ | |
234 | if ((false_alarms > max_false_alarms) && | |
235 | (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) { | |
236 | IWL_DEBUG_CALIB("norm FA %u > max FA %u\n", | |
237 | false_alarms, max_false_alarms); | |
238 | IWL_DEBUG_CALIB("... reducing sensitivity\n"); | |
239 | data->nrg_curr_state = IWL_FA_TOO_MANY; | |
240 | /* Store for "fewer than desired" on later beacon */ | |
241 | data->nrg_silence_ref = silence_ref; | |
242 | ||
243 | /* increase energy threshold (reduce nrg value) | |
244 | * to decrease sensitivity */ | |
245 | if (data->nrg_th_cck > | |
246 | (ranges->max_nrg_cck + NRG_STEP_CCK)) | |
247 | data->nrg_th_cck = data->nrg_th_cck | |
248 | - NRG_STEP_CCK; | |
249 | else | |
250 | data->nrg_th_cck = ranges->max_nrg_cck; | |
251 | /* Else if we got fewer than desired, increase sensitivity */ | |
252 | } else if (false_alarms < min_false_alarms) { | |
253 | data->nrg_curr_state = IWL_FA_TOO_FEW; | |
254 | ||
255 | /* Compare silence level with silence level for most recent | |
256 | * healthy number or too many false alarms */ | |
257 | data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref - | |
258 | (s32)silence_ref; | |
259 | ||
260 | IWL_DEBUG_CALIB("norm FA %u < min FA %u, silence diff %d\n", | |
261 | false_alarms, min_false_alarms, | |
262 | data->nrg_auto_corr_silence_diff); | |
263 | ||
264 | /* Increase value to increase sensitivity, but only if: | |
265 | * 1a) previous beacon did *not* have *too many* false alarms | |
266 | * 1b) AND there's a significant difference in Rx levels | |
267 | * from a previous beacon with too many, or healthy # FAs | |
268 | * OR 2) We've seen a lot of beacons (100) with too few | |
269 | * false alarms */ | |
270 | if ((data->nrg_prev_state != IWL_FA_TOO_MANY) && | |
271 | ((data->nrg_auto_corr_silence_diff > NRG_DIFF) || | |
272 | (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) { | |
273 | ||
274 | IWL_DEBUG_CALIB("... increasing sensitivity\n"); | |
275 | /* Increase nrg value to increase sensitivity */ | |
276 | val = data->nrg_th_cck + NRG_STEP_CCK; | |
277 | data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val); | |
278 | } else { | |
279 | IWL_DEBUG_CALIB("... but not changing sensitivity\n"); | |
280 | } | |
281 | ||
282 | /* Else we got a healthy number of false alarms, keep status quo */ | |
283 | } else { | |
284 | IWL_DEBUG_CALIB(" FA in safe zone\n"); | |
285 | data->nrg_curr_state = IWL_FA_GOOD_RANGE; | |
286 | ||
287 | /* Store for use in "fewer than desired" with later beacon */ | |
288 | data->nrg_silence_ref = silence_ref; | |
289 | ||
290 | /* If previous beacon had too many false alarms, | |
291 | * give it some extra margin by reducing sensitivity again | |
292 | * (but don't go below measured energy of desired Rx) */ | |
293 | if (IWL_FA_TOO_MANY == data->nrg_prev_state) { | |
294 | IWL_DEBUG_CALIB("... increasing margin\n"); | |
295 | if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN)) | |
296 | data->nrg_th_cck -= NRG_MARGIN; | |
297 | else | |
298 | data->nrg_th_cck = max_nrg_cck; | |
299 | } | |
300 | } | |
301 | ||
302 | /* Make sure the energy threshold does not go above the measured | |
303 | * energy of the desired Rx signals (reduced by backoff margin), | |
304 | * or else we might start missing Rx frames. | |
305 | * Lower value is higher energy, so we use max()! | |
306 | */ | |
307 | data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck); | |
308 | IWL_DEBUG_CALIB("new nrg_th_cck %u\n", data->nrg_th_cck); | |
309 | ||
310 | data->nrg_prev_state = data->nrg_curr_state; | |
311 | ||
312 | /* Auto-correlation CCK algorithm */ | |
313 | if (false_alarms > min_false_alarms) { | |
314 | ||
315 | /* increase auto_corr values to decrease sensitivity | |
316 | * so the DSP won't be disturbed by the noise | |
317 | */ | |
318 | if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK) | |
319 | data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1; | |
320 | else { | |
321 | val = data->auto_corr_cck + AUTO_CORR_STEP_CCK; | |
322 | data->auto_corr_cck = | |
323 | min((u32)ranges->auto_corr_max_cck, val); | |
324 | } | |
325 | val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK; | |
326 | data->auto_corr_cck_mrc = | |
327 | min((u32)ranges->auto_corr_max_cck_mrc, val); | |
328 | } else if ((false_alarms < min_false_alarms) && | |
329 | ((data->nrg_auto_corr_silence_diff > NRG_DIFF) || | |
330 | (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) { | |
331 | ||
332 | /* Decrease auto_corr values to increase sensitivity */ | |
333 | val = data->auto_corr_cck - AUTO_CORR_STEP_CCK; | |
334 | data->auto_corr_cck = | |
335 | max((u32)ranges->auto_corr_min_cck, val); | |
336 | val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK; | |
337 | data->auto_corr_cck_mrc = | |
338 | max((u32)ranges->auto_corr_min_cck_mrc, val); | |
339 | } | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | ||
345 | static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv, | |
346 | u32 norm_fa, | |
347 | u32 rx_enable_time) | |
348 | { | |
349 | u32 val; | |
350 | u32 false_alarms = norm_fa * 200 * 1024; | |
351 | u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time; | |
352 | u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time; | |
353 | struct iwl_sensitivity_data *data = NULL; | |
354 | const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens; | |
355 | ||
356 | data = &(priv->sensitivity_data); | |
357 | ||
358 | /* If we got too many false alarms this time, reduce sensitivity */ | |
359 | if (false_alarms > max_false_alarms) { | |
360 | ||
361 | IWL_DEBUG_CALIB("norm FA %u > max FA %u)\n", | |
362 | false_alarms, max_false_alarms); | |
363 | ||
364 | val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM; | |
365 | data->auto_corr_ofdm = | |
366 | min((u32)ranges->auto_corr_max_ofdm, val); | |
367 | ||
368 | val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM; | |
369 | data->auto_corr_ofdm_mrc = | |
370 | min((u32)ranges->auto_corr_max_ofdm_mrc, val); | |
371 | ||
372 | val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM; | |
373 | data->auto_corr_ofdm_x1 = | |
374 | min((u32)ranges->auto_corr_max_ofdm_x1, val); | |
375 | ||
376 | val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM; | |
377 | data->auto_corr_ofdm_mrc_x1 = | |
378 | min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val); | |
379 | } | |
380 | ||
381 | /* Else if we got fewer than desired, increase sensitivity */ | |
382 | else if (false_alarms < min_false_alarms) { | |
383 | ||
384 | IWL_DEBUG_CALIB("norm FA %u < min FA %u\n", | |
385 | false_alarms, min_false_alarms); | |
386 | ||
387 | val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM; | |
388 | data->auto_corr_ofdm = | |
389 | max((u32)ranges->auto_corr_min_ofdm, val); | |
390 | ||
391 | val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM; | |
392 | data->auto_corr_ofdm_mrc = | |
393 | max((u32)ranges->auto_corr_min_ofdm_mrc, val); | |
394 | ||
395 | val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM; | |
396 | data->auto_corr_ofdm_x1 = | |
397 | max((u32)ranges->auto_corr_min_ofdm_x1, val); | |
398 | ||
399 | val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM; | |
400 | data->auto_corr_ofdm_mrc_x1 = | |
401 | max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val); | |
402 | } else { | |
403 | IWL_DEBUG_CALIB("min FA %u < norm FA %u < max FA %u OK\n", | |
404 | min_false_alarms, false_alarms, max_false_alarms); | |
405 | } | |
406 | return 0; | |
407 | } | |
408 | ||
409 | /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */ | |
410 | static int iwl_sensitivity_write(struct iwl_priv *priv) | |
411 | { | |
412 | int ret = 0; | |
413 | struct iwl_sensitivity_cmd cmd ; | |
414 | struct iwl_sensitivity_data *data = NULL; | |
415 | struct iwl_host_cmd cmd_out = { | |
416 | .id = SENSITIVITY_CMD, | |
417 | .len = sizeof(struct iwl_sensitivity_cmd), | |
418 | .meta.flags = CMD_ASYNC, | |
419 | .data = &cmd, | |
420 | }; | |
421 | ||
422 | data = &(priv->sensitivity_data); | |
423 | ||
424 | memset(&cmd, 0, sizeof(cmd)); | |
425 | ||
426 | cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] = | |
427 | cpu_to_le16((u16)data->auto_corr_ofdm); | |
428 | cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] = | |
429 | cpu_to_le16((u16)data->auto_corr_ofdm_mrc); | |
430 | cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] = | |
431 | cpu_to_le16((u16)data->auto_corr_ofdm_x1); | |
432 | cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] = | |
433 | cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1); | |
434 | ||
435 | cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] = | |
436 | cpu_to_le16((u16)data->auto_corr_cck); | |
437 | cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] = | |
438 | cpu_to_le16((u16)data->auto_corr_cck_mrc); | |
439 | ||
440 | cmd.table[HD_MIN_ENERGY_CCK_DET_INDEX] = | |
441 | cpu_to_le16((u16)data->nrg_th_cck); | |
442 | cmd.table[HD_MIN_ENERGY_OFDM_DET_INDEX] = | |
443 | cpu_to_le16((u16)data->nrg_th_ofdm); | |
444 | ||
445 | cmd.table[HD_BARKER_CORR_TH_ADD_MIN_INDEX] = | |
446 | __constant_cpu_to_le16(190); | |
447 | cmd.table[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] = | |
448 | __constant_cpu_to_le16(390); | |
449 | cmd.table[HD_OFDM_ENERGY_TH_IN_INDEX] = | |
450 | __constant_cpu_to_le16(62); | |
451 | ||
452 | IWL_DEBUG_CALIB("ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n", | |
453 | data->auto_corr_ofdm, data->auto_corr_ofdm_mrc, | |
454 | data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1, | |
455 | data->nrg_th_ofdm); | |
456 | ||
457 | IWL_DEBUG_CALIB("cck: ac %u mrc %u thresh %u\n", | |
458 | data->auto_corr_cck, data->auto_corr_cck_mrc, | |
459 | data->nrg_th_cck); | |
460 | ||
461 | /* Update uCode's "work" table, and copy it to DSP */ | |
462 | cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE; | |
463 | ||
464 | /* Don't send command to uCode if nothing has changed */ | |
465 | if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]), | |
466 | sizeof(u16)*HD_TABLE_SIZE)) { | |
467 | IWL_DEBUG_CALIB("No change in SENSITIVITY_CMD\n"); | |
468 | return 0; | |
469 | } | |
470 | ||
471 | /* Copy table for comparison next time */ | |
472 | memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]), | |
473 | sizeof(u16)*HD_TABLE_SIZE); | |
474 | ||
475 | ret = iwl_send_cmd(priv, &cmd_out); | |
476 | if (ret) | |
477 | IWL_ERROR("SENSITIVITY_CMD failed\n"); | |
478 | ||
479 | return ret; | |
480 | } | |
481 | ||
482 | void iwl_init_sensitivity(struct iwl_priv *priv) | |
483 | { | |
484 | int ret = 0; | |
485 | int i; | |
486 | struct iwl_sensitivity_data *data = NULL; | |
487 | const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens; | |
488 | ||
445c2dff TW |
489 | if (priv->disable_sens_cal) |
490 | return; | |
491 | ||
f0832f13 EG |
492 | IWL_DEBUG_CALIB("Start iwl_init_sensitivity\n"); |
493 | ||
494 | /* Clear driver's sensitivity algo data */ | |
495 | data = &(priv->sensitivity_data); | |
496 | ||
497 | if (ranges == NULL) | |
f0832f13 EG |
498 | return; |
499 | ||
500 | memset(data, 0, sizeof(struct iwl_sensitivity_data)); | |
501 | ||
502 | data->num_in_cck_no_fa = 0; | |
503 | data->nrg_curr_state = IWL_FA_TOO_MANY; | |
504 | data->nrg_prev_state = IWL_FA_TOO_MANY; | |
505 | data->nrg_silence_ref = 0; | |
506 | data->nrg_silence_idx = 0; | |
507 | data->nrg_energy_idx = 0; | |
508 | ||
509 | for (i = 0; i < 10; i++) | |
510 | data->nrg_value[i] = 0; | |
511 | ||
512 | for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) | |
513 | data->nrg_silence_rssi[i] = 0; | |
514 | ||
515 | data->auto_corr_ofdm = 90; | |
516 | data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc; | |
517 | data->auto_corr_ofdm_x1 = ranges->auto_corr_min_ofdm_x1; | |
518 | data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1; | |
519 | data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF; | |
520 | data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc; | |
521 | data->nrg_th_cck = ranges->nrg_th_cck; | |
522 | data->nrg_th_ofdm = ranges->nrg_th_ofdm; | |
523 | ||
524 | data->last_bad_plcp_cnt_ofdm = 0; | |
525 | data->last_fa_cnt_ofdm = 0; | |
526 | data->last_bad_plcp_cnt_cck = 0; | |
527 | data->last_fa_cnt_cck = 0; | |
528 | ||
529 | ret |= iwl_sensitivity_write(priv); | |
530 | IWL_DEBUG_CALIB("<<return 0x%X\n", ret); | |
531 | } | |
532 | EXPORT_SYMBOL(iwl_init_sensitivity); | |
533 | ||
534 | void iwl_sensitivity_calibration(struct iwl_priv *priv, | |
8f91aecb | 535 | struct iwl_notif_statistics *resp) |
f0832f13 EG |
536 | { |
537 | u32 rx_enable_time; | |
538 | u32 fa_cck; | |
539 | u32 fa_ofdm; | |
540 | u32 bad_plcp_cck; | |
541 | u32 bad_plcp_ofdm; | |
542 | u32 norm_fa_ofdm; | |
543 | u32 norm_fa_cck; | |
544 | struct iwl_sensitivity_data *data = NULL; | |
545 | struct statistics_rx_non_phy *rx_info = &(resp->rx.general); | |
546 | struct statistics_rx *statistics = &(resp->rx); | |
547 | unsigned long flags; | |
548 | struct statistics_general_data statis; | |
549 | ||
445c2dff TW |
550 | if (priv->disable_sens_cal) |
551 | return; | |
552 | ||
f0832f13 EG |
553 | data = &(priv->sensitivity_data); |
554 | ||
555 | if (!iwl_is_associated(priv)) { | |
556 | IWL_DEBUG_CALIB("<< - not associated\n"); | |
557 | return; | |
558 | } | |
559 | ||
560 | spin_lock_irqsave(&priv->lock, flags); | |
561 | if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) { | |
562 | IWL_DEBUG_CALIB("<< invalid data.\n"); | |
563 | spin_unlock_irqrestore(&priv->lock, flags); | |
564 | return; | |
565 | } | |
566 | ||
567 | /* Extract Statistics: */ | |
568 | rx_enable_time = le32_to_cpu(rx_info->channel_load); | |
569 | fa_cck = le32_to_cpu(statistics->cck.false_alarm_cnt); | |
570 | fa_ofdm = le32_to_cpu(statistics->ofdm.false_alarm_cnt); | |
571 | bad_plcp_cck = le32_to_cpu(statistics->cck.plcp_err); | |
572 | bad_plcp_ofdm = le32_to_cpu(statistics->ofdm.plcp_err); | |
573 | ||
574 | statis.beacon_silence_rssi_a = | |
575 | le32_to_cpu(statistics->general.beacon_silence_rssi_a); | |
576 | statis.beacon_silence_rssi_b = | |
577 | le32_to_cpu(statistics->general.beacon_silence_rssi_b); | |
578 | statis.beacon_silence_rssi_c = | |
579 | le32_to_cpu(statistics->general.beacon_silence_rssi_c); | |
580 | statis.beacon_energy_a = | |
581 | le32_to_cpu(statistics->general.beacon_energy_a); | |
582 | statis.beacon_energy_b = | |
583 | le32_to_cpu(statistics->general.beacon_energy_b); | |
584 | statis.beacon_energy_c = | |
585 | le32_to_cpu(statistics->general.beacon_energy_c); | |
586 | ||
587 | spin_unlock_irqrestore(&priv->lock, flags); | |
588 | ||
589 | IWL_DEBUG_CALIB("rx_enable_time = %u usecs\n", rx_enable_time); | |
590 | ||
591 | if (!rx_enable_time) { | |
592 | IWL_DEBUG_CALIB("<< RX Enable Time == 0! \n"); | |
593 | return; | |
594 | } | |
595 | ||
596 | /* These statistics increase monotonically, and do not reset | |
597 | * at each beacon. Calculate difference from last value, or just | |
598 | * use the new statistics value if it has reset or wrapped around. */ | |
599 | if (data->last_bad_plcp_cnt_cck > bad_plcp_cck) | |
600 | data->last_bad_plcp_cnt_cck = bad_plcp_cck; | |
601 | else { | |
602 | bad_plcp_cck -= data->last_bad_plcp_cnt_cck; | |
603 | data->last_bad_plcp_cnt_cck += bad_plcp_cck; | |
604 | } | |
605 | ||
606 | if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm) | |
607 | data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm; | |
608 | else { | |
609 | bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm; | |
610 | data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm; | |
611 | } | |
612 | ||
613 | if (data->last_fa_cnt_ofdm > fa_ofdm) | |
614 | data->last_fa_cnt_ofdm = fa_ofdm; | |
615 | else { | |
616 | fa_ofdm -= data->last_fa_cnt_ofdm; | |
617 | data->last_fa_cnt_ofdm += fa_ofdm; | |
618 | } | |
619 | ||
620 | if (data->last_fa_cnt_cck > fa_cck) | |
621 | data->last_fa_cnt_cck = fa_cck; | |
622 | else { | |
623 | fa_cck -= data->last_fa_cnt_cck; | |
624 | data->last_fa_cnt_cck += fa_cck; | |
625 | } | |
626 | ||
627 | /* Total aborted signal locks */ | |
628 | norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm; | |
629 | norm_fa_cck = fa_cck + bad_plcp_cck; | |
630 | ||
631 | IWL_DEBUG_CALIB("cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck, | |
632 | bad_plcp_cck, fa_ofdm, bad_plcp_ofdm); | |
633 | ||
634 | iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time); | |
635 | iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis); | |
636 | iwl_sensitivity_write(priv); | |
637 | ||
638 | return; | |
639 | } | |
640 | EXPORT_SYMBOL(iwl_sensitivity_calibration); | |
641 | ||
642 | /* | |
643 | * Accumulate 20 beacons of signal and noise statistics for each of | |
644 | * 3 receivers/antennas/rx-chains, then figure out: | |
645 | * 1) Which antennas are connected. | |
646 | * 2) Differential rx gain settings to balance the 3 receivers. | |
647 | */ | |
648 | void iwl_chain_noise_calibration(struct iwl_priv *priv, | |
8f91aecb | 649 | struct iwl_notif_statistics *stat_resp) |
f0832f13 EG |
650 | { |
651 | struct iwl_chain_noise_data *data = NULL; | |
652 | ||
653 | u32 chain_noise_a; | |
654 | u32 chain_noise_b; | |
655 | u32 chain_noise_c; | |
656 | u32 chain_sig_a; | |
657 | u32 chain_sig_b; | |
658 | u32 chain_sig_c; | |
659 | u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE}; | |
660 | u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE}; | |
661 | u32 max_average_sig; | |
662 | u16 max_average_sig_antenna_i; | |
663 | u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE; | |
664 | u16 min_average_noise_antenna_i = INITIALIZATION_VALUE; | |
665 | u16 i = 0; | |
666 | u16 rxon_chnum = INITIALIZATION_VALUE; | |
667 | u16 stat_chnum = INITIALIZATION_VALUE; | |
668 | u8 rxon_band24; | |
669 | u8 stat_band24; | |
670 | u32 active_chains = 0; | |
671 | u8 num_tx_chains; | |
672 | unsigned long flags; | |
673 | struct statistics_rx_non_phy *rx_info = &(stat_resp->rx.general); | |
674 | ||
445c2dff TW |
675 | if (priv->disable_chain_noise_cal) |
676 | return; | |
677 | ||
f0832f13 EG |
678 | data = &(priv->chain_noise_data); |
679 | ||
680 | /* Accumulate just the first 20 beacons after the first association, | |
681 | * then we're done forever. */ | |
682 | if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) { | |
683 | if (data->state == IWL_CHAIN_NOISE_ALIVE) | |
684 | IWL_DEBUG_CALIB("Wait for noise calib reset\n"); | |
685 | return; | |
686 | } | |
687 | ||
688 | spin_lock_irqsave(&priv->lock, flags); | |
689 | if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) { | |
690 | IWL_DEBUG_CALIB(" << Interference data unavailable\n"); | |
691 | spin_unlock_irqrestore(&priv->lock, flags); | |
692 | return; | |
693 | } | |
694 | ||
695 | rxon_band24 = !!(priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK); | |
696 | rxon_chnum = le16_to_cpu(priv->staging_rxon.channel); | |
697 | stat_band24 = !!(stat_resp->flag & STATISTICS_REPLY_FLG_BAND_24G_MSK); | |
698 | stat_chnum = le32_to_cpu(stat_resp->flag) >> 16; | |
699 | ||
700 | /* Make sure we accumulate data for just the associated channel | |
701 | * (even if scanning). */ | |
702 | if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) { | |
703 | IWL_DEBUG_CALIB("Stats not from chan=%d, band24=%d\n", | |
704 | rxon_chnum, rxon_band24); | |
705 | spin_unlock_irqrestore(&priv->lock, flags); | |
706 | return; | |
707 | } | |
708 | ||
709 | /* Accumulate beacon statistics values across 20 beacons */ | |
710 | chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) & | |
711 | IN_BAND_FILTER; | |
712 | chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) & | |
713 | IN_BAND_FILTER; | |
714 | chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) & | |
715 | IN_BAND_FILTER; | |
716 | ||
717 | chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER; | |
718 | chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER; | |
719 | chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER; | |
720 | ||
721 | spin_unlock_irqrestore(&priv->lock, flags); | |
722 | ||
723 | data->beacon_count++; | |
724 | ||
725 | data->chain_noise_a = (chain_noise_a + data->chain_noise_a); | |
726 | data->chain_noise_b = (chain_noise_b + data->chain_noise_b); | |
727 | data->chain_noise_c = (chain_noise_c + data->chain_noise_c); | |
728 | ||
729 | data->chain_signal_a = (chain_sig_a + data->chain_signal_a); | |
730 | data->chain_signal_b = (chain_sig_b + data->chain_signal_b); | |
731 | data->chain_signal_c = (chain_sig_c + data->chain_signal_c); | |
732 | ||
733 | IWL_DEBUG_CALIB("chan=%d, band24=%d, beacon=%d\n", | |
734 | rxon_chnum, rxon_band24, data->beacon_count); | |
735 | IWL_DEBUG_CALIB("chain_sig: a %d b %d c %d\n", | |
736 | chain_sig_a, chain_sig_b, chain_sig_c); | |
737 | IWL_DEBUG_CALIB("chain_noise: a %d b %d c %d\n", | |
738 | chain_noise_a, chain_noise_b, chain_noise_c); | |
739 | ||
740 | /* If this is the 20th beacon, determine: | |
741 | * 1) Disconnected antennas (using signal strengths) | |
742 | * 2) Differential gain (using silence noise) to balance receivers */ | |
743 | if (data->beacon_count != CAL_NUM_OF_BEACONS) | |
744 | return; | |
745 | ||
746 | /* Analyze signal for disconnected antenna */ | |
747 | average_sig[0] = (data->chain_signal_a) / CAL_NUM_OF_BEACONS; | |
748 | average_sig[1] = (data->chain_signal_b) / CAL_NUM_OF_BEACONS; | |
749 | average_sig[2] = (data->chain_signal_c) / CAL_NUM_OF_BEACONS; | |
750 | ||
751 | if (average_sig[0] >= average_sig[1]) { | |
752 | max_average_sig = average_sig[0]; | |
753 | max_average_sig_antenna_i = 0; | |
754 | active_chains = (1 << max_average_sig_antenna_i); | |
755 | } else { | |
756 | max_average_sig = average_sig[1]; | |
757 | max_average_sig_antenna_i = 1; | |
758 | active_chains = (1 << max_average_sig_antenna_i); | |
759 | } | |
760 | ||
761 | if (average_sig[2] >= max_average_sig) { | |
762 | max_average_sig = average_sig[2]; | |
763 | max_average_sig_antenna_i = 2; | |
764 | active_chains = (1 << max_average_sig_antenna_i); | |
765 | } | |
766 | ||
767 | IWL_DEBUG_CALIB("average_sig: a %d b %d c %d\n", | |
768 | average_sig[0], average_sig[1], average_sig[2]); | |
769 | IWL_DEBUG_CALIB("max_average_sig = %d, antenna %d\n", | |
770 | max_average_sig, max_average_sig_antenna_i); | |
771 | ||
772 | /* Compare signal strengths for all 3 receivers. */ | |
773 | for (i = 0; i < NUM_RX_CHAINS; i++) { | |
774 | if (i != max_average_sig_antenna_i) { | |
775 | s32 rssi_delta = (max_average_sig - average_sig[i]); | |
776 | ||
777 | /* If signal is very weak, compared with | |
778 | * strongest, mark it as disconnected. */ | |
779 | if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS) | |
780 | data->disconn_array[i] = 1; | |
781 | else | |
782 | active_chains |= (1 << i); | |
783 | IWL_DEBUG_CALIB("i = %d rssiDelta = %d " | |
784 | "disconn_array[i] = %d\n", | |
785 | i, rssi_delta, data->disconn_array[i]); | |
786 | } | |
787 | } | |
788 | ||
789 | num_tx_chains = 0; | |
790 | for (i = 0; i < NUM_RX_CHAINS; i++) { | |
791 | /* loops on all the bits of | |
792 | * priv->hw_setting.valid_tx_ant */ | |
793 | u8 ant_msk = (1 << i); | |
794 | if (!(priv->hw_params.valid_tx_ant & ant_msk)) | |
795 | continue; | |
796 | ||
797 | num_tx_chains++; | |
798 | if (data->disconn_array[i] == 0) | |
799 | /* there is a Tx antenna connected */ | |
800 | break; | |
801 | if (num_tx_chains == priv->hw_params.tx_chains_num && | |
802 | data->disconn_array[i]) { | |
803 | /* This is the last TX antenna and is also | |
804 | * disconnected connect it anyway */ | |
805 | data->disconn_array[i] = 0; | |
806 | active_chains |= ant_msk; | |
807 | IWL_DEBUG_CALIB("All Tx chains are disconnected W/A - " | |
808 | "declare %d as connected\n", i); | |
809 | break; | |
810 | } | |
811 | } | |
812 | ||
04816448 GE |
813 | /* Save for use within RXON, TX, SCAN commands, etc. */ |
814 | priv->chain_noise_data.active_chains = active_chains; | |
f0832f13 EG |
815 | IWL_DEBUG_CALIB("active_chains (bitwise) = 0x%x\n", |
816 | active_chains); | |
817 | ||
f0832f13 EG |
818 | /* Analyze noise for rx balance */ |
819 | average_noise[0] = ((data->chain_noise_a)/CAL_NUM_OF_BEACONS); | |
820 | average_noise[1] = ((data->chain_noise_b)/CAL_NUM_OF_BEACONS); | |
821 | average_noise[2] = ((data->chain_noise_c)/CAL_NUM_OF_BEACONS); | |
822 | ||
823 | for (i = 0; i < NUM_RX_CHAINS; i++) { | |
824 | if (!(data->disconn_array[i]) && | |
825 | (average_noise[i] <= min_average_noise)) { | |
826 | /* This means that chain i is active and has | |
827 | * lower noise values so far: */ | |
828 | min_average_noise = average_noise[i]; | |
829 | min_average_noise_antenna_i = i; | |
830 | } | |
831 | } | |
832 | ||
833 | IWL_DEBUG_CALIB("average_noise: a %d b %d c %d\n", | |
834 | average_noise[0], average_noise[1], | |
835 | average_noise[2]); | |
836 | ||
837 | IWL_DEBUG_CALIB("min_average_noise = %d, antenna %d\n", | |
838 | min_average_noise, min_average_noise_antenna_i); | |
839 | ||
840 | priv->cfg->ops->utils->gain_computation(priv, average_noise, | |
841 | min_average_noise_antenna_i, min_average_noise); | |
04816448 GE |
842 | |
843 | /* Some power changes may have been made during the calibration. | |
844 | * Update and commit the RXON | |
845 | */ | |
846 | if (priv->cfg->ops->lib->update_chain_flags) | |
847 | priv->cfg->ops->lib->update_chain_flags(priv); | |
848 | ||
849 | data->state = IWL_CHAIN_NOISE_DONE; | |
850 | iwl_power_enable_management(priv); | |
f0832f13 EG |
851 | } |
852 | EXPORT_SYMBOL(iwl_chain_noise_calibration); | |
853 | ||
4a4a9e81 TW |
854 | |
855 | void iwl_reset_run_time_calib(struct iwl_priv *priv) | |
856 | { | |
857 | int i; | |
858 | memset(&(priv->sensitivity_data), 0, | |
859 | sizeof(struct iwl_sensitivity_data)); | |
860 | memset(&(priv->chain_noise_data), 0, | |
861 | sizeof(struct iwl_chain_noise_data)); | |
862 | for (i = 0; i < NUM_RX_CHAINS; i++) | |
863 | priv->chain_noise_data.delta_gain_code[i] = | |
864 | CHAIN_NOISE_DELTA_GAIN_INIT_VAL; | |
865 | ||
866 | /* Ask for statistics now, the uCode will send notification | |
867 | * periodically after association */ | |
868 | iwl_send_statistics_request(priv, CMD_ASYNC); | |
869 | } | |
870 | EXPORT_SYMBOL(iwl_reset_run_time_calib); | |
871 |