treewide: cleanup continuations and remove logging message whitespace
[linux-2.6.git] / drivers / net / wireless / iwlegacy / iwl-4965-calib.c
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 - 2011 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  *
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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  *
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25  * in the file called LICENSE.GPL.
26  *
27  * Contact Information:
28  *  Intel Linux Wireless <ilw@linux.intel.com>
29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
30  *
31  * BSD LICENSE
32  *
33  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
34  * All rights reserved.
35  *
36  * Redistribution and use in source and binary forms, with or without
37  * modification, are permitted provided that the following conditions
38  * are met:
39  *
40  *  * Redistributions of source code must retain the above copyright
41  *    notice, this list of conditions and the following disclaimer.
42  *  * Redistributions in binary form must reproduce the above copyright
43  *    notice, this list of conditions and the following disclaimer in
44  *    the documentation and/or other materials provided with the
45  *    distribution.
46  *  * Neither the name Intel Corporation nor the names of its
47  *    contributors may be used to endorse or promote products derived
48  *    from this software without specific prior written permission.
49  *
50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61  *****************************************************************************/
62
63 #include <linux/slab.h>
64 #include <net/mac80211.h>
65
66 #include "iwl-dev.h"
67 #include "iwl-core.h"
68 #include "iwl-4965-calib.h"
69
70 /*****************************************************************************
71  * INIT calibrations framework
72  *****************************************************************************/
73
74 struct statistics_general_data {
75         u32 beacon_silence_rssi_a;
76         u32 beacon_silence_rssi_b;
77         u32 beacon_silence_rssi_c;
78         u32 beacon_energy_a;
79         u32 beacon_energy_b;
80         u32 beacon_energy_c;
81 };
82
83 void iwl4965_calib_free_results(struct iwl_priv *priv)
84 {
85         int i;
86
87         for (i = 0; i < IWL_CALIB_MAX; i++) {
88                 kfree(priv->calib_results[i].buf);
89                 priv->calib_results[i].buf = NULL;
90                 priv->calib_results[i].buf_len = 0;
91         }
92 }
93
94 /*****************************************************************************
95  * RUNTIME calibrations framework
96  *****************************************************************************/
97
98 /* "false alarms" are signals that our DSP tries to lock onto,
99  *   but then determines that they are either noise, or transmissions
100  *   from a distant wireless network (also "noise", really) that get
101  *   "stepped on" by stronger transmissions within our own network.
102  * This algorithm attempts to set a sensitivity level that is high
103  *   enough to receive all of our own network traffic, but not so
104  *   high that our DSP gets too busy trying to lock onto non-network
105  *   activity/noise. */
106 static int iwl4965_sens_energy_cck(struct iwl_priv *priv,
107                                    u32 norm_fa,
108                                    u32 rx_enable_time,
109                                    struct statistics_general_data *rx_info)
110 {
111         u32 max_nrg_cck = 0;
112         int i = 0;
113         u8 max_silence_rssi = 0;
114         u32 silence_ref = 0;
115         u8 silence_rssi_a = 0;
116         u8 silence_rssi_b = 0;
117         u8 silence_rssi_c = 0;
118         u32 val;
119
120         /* "false_alarms" values below are cross-multiplications to assess the
121          *   numbers of false alarms within the measured period of actual Rx
122          *   (Rx is off when we're txing), vs the min/max expected false alarms
123          *   (some should be expected if rx is sensitive enough) in a
124          *   hypothetical listening period of 200 time units (TU), 204.8 msec:
125          *
126          * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
127          *
128          * */
129         u32 false_alarms = norm_fa * 200 * 1024;
130         u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
131         u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
132         struct iwl_sensitivity_data *data = NULL;
133         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
134
135         data = &(priv->sensitivity_data);
136
137         data->nrg_auto_corr_silence_diff = 0;
138
139         /* Find max silence rssi among all 3 receivers.
140          * This is background noise, which may include transmissions from other
141          *    networks, measured during silence before our network's beacon */
142         silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
143                             ALL_BAND_FILTER) >> 8);
144         silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
145                             ALL_BAND_FILTER) >> 8);
146         silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
147                             ALL_BAND_FILTER) >> 8);
148
149         val = max(silence_rssi_b, silence_rssi_c);
150         max_silence_rssi = max(silence_rssi_a, (u8) val);
151
152         /* Store silence rssi in 20-beacon history table */
153         data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
154         data->nrg_silence_idx++;
155         if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
156                 data->nrg_silence_idx = 0;
157
158         /* Find max silence rssi across 20 beacon history */
159         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
160                 val = data->nrg_silence_rssi[i];
161                 silence_ref = max(silence_ref, val);
162         }
163         IWL_DEBUG_CALIB(priv, "silence a %u, b %u, c %u, 20-bcn max %u\n",
164                         silence_rssi_a, silence_rssi_b, silence_rssi_c,
165                         silence_ref);
166
167         /* Find max rx energy (min value!) among all 3 receivers,
168          *   measured during beacon frame.
169          * Save it in 10-beacon history table. */
170         i = data->nrg_energy_idx;
171         val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
172         data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
173
174         data->nrg_energy_idx++;
175         if (data->nrg_energy_idx >= 10)
176                 data->nrg_energy_idx = 0;
177
178         /* Find min rx energy (max value) across 10 beacon history.
179          * This is the minimum signal level that we want to receive well.
180          * Add backoff (margin so we don't miss slightly lower energy frames).
181          * This establishes an upper bound (min value) for energy threshold. */
182         max_nrg_cck = data->nrg_value[0];
183         for (i = 1; i < 10; i++)
184                 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
185         max_nrg_cck += 6;
186
187         IWL_DEBUG_CALIB(priv, "rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
188                         rx_info->beacon_energy_a, rx_info->beacon_energy_b,
189                         rx_info->beacon_energy_c, max_nrg_cck - 6);
190
191         /* Count number of consecutive beacons with fewer-than-desired
192          *   false alarms. */
193         if (false_alarms < min_false_alarms)
194                 data->num_in_cck_no_fa++;
195         else
196                 data->num_in_cck_no_fa = 0;
197         IWL_DEBUG_CALIB(priv, "consecutive bcns with few false alarms = %u\n",
198                         data->num_in_cck_no_fa);
199
200         /* If we got too many false alarms this time, reduce sensitivity */
201         if ((false_alarms > max_false_alarms) &&
202                 (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {
203                 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u\n",
204                      false_alarms, max_false_alarms);
205                 IWL_DEBUG_CALIB(priv, "... reducing sensitivity\n");
206                 data->nrg_curr_state = IWL_FA_TOO_MANY;
207                 /* Store for "fewer than desired" on later beacon */
208                 data->nrg_silence_ref = silence_ref;
209
210                 /* increase energy threshold (reduce nrg value)
211                  *   to decrease sensitivity */
212                 data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK;
213         /* Else if we got fewer than desired, increase sensitivity */
214         } else if (false_alarms < min_false_alarms) {
215                 data->nrg_curr_state = IWL_FA_TOO_FEW;
216
217                 /* Compare silence level with silence level for most recent
218                  *   healthy number or too many false alarms */
219                 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
220                                                    (s32)silence_ref;
221
222                 IWL_DEBUG_CALIB(priv,
223                          "norm FA %u < min FA %u, silence diff %d\n",
224                          false_alarms, min_false_alarms,
225                          data->nrg_auto_corr_silence_diff);
226
227                 /* Increase value to increase sensitivity, but only if:
228                  * 1a) previous beacon did *not* have *too many* false alarms
229                  * 1b) AND there's a significant difference in Rx levels
230                  *      from a previous beacon with too many, or healthy # FAs
231                  * OR 2) We've seen a lot of beacons (100) with too few
232                  *       false alarms */
233                 if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
234                         ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
235                         (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
236
237                         IWL_DEBUG_CALIB(priv, "... increasing sensitivity\n");
238                         /* Increase nrg value to increase sensitivity */
239                         val = data->nrg_th_cck + NRG_STEP_CCK;
240                         data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
241                 } else {
242                         IWL_DEBUG_CALIB(priv,
243                                          "... but not changing sensitivity\n");
244                 }
245
246         /* Else we got a healthy number of false alarms, keep status quo */
247         } else {
248                 IWL_DEBUG_CALIB(priv, " FA in safe zone\n");
249                 data->nrg_curr_state = IWL_FA_GOOD_RANGE;
250
251                 /* Store for use in "fewer than desired" with later beacon */
252                 data->nrg_silence_ref = silence_ref;
253
254                 /* If previous beacon had too many false alarms,
255                  *   give it some extra margin by reducing sensitivity again
256                  *   (but don't go below measured energy of desired Rx) */
257                 if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
258                         IWL_DEBUG_CALIB(priv, "... increasing margin\n");
259                         if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
260                                 data->nrg_th_cck -= NRG_MARGIN;
261                         else
262                                 data->nrg_th_cck = max_nrg_cck;
263                 }
264         }
265
266         /* Make sure the energy threshold does not go above the measured
267          * energy of the desired Rx signals (reduced by backoff margin),
268          * or else we might start missing Rx frames.
269          * Lower value is higher energy, so we use max()!
270          */
271         data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
272         IWL_DEBUG_CALIB(priv, "new nrg_th_cck %u\n", data->nrg_th_cck);
273
274         data->nrg_prev_state = data->nrg_curr_state;
275
276         /* Auto-correlation CCK algorithm */
277         if (false_alarms > min_false_alarms) {
278
279                 /* increase auto_corr values to decrease sensitivity
280                  * so the DSP won't be disturbed by the noise
281                  */
282                 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
283                         data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
284                 else {
285                         val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
286                         data->auto_corr_cck =
287                                 min((u32)ranges->auto_corr_max_cck, val);
288                 }
289                 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
290                 data->auto_corr_cck_mrc =
291                         min((u32)ranges->auto_corr_max_cck_mrc, val);
292         } else if ((false_alarms < min_false_alarms) &&
293            ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
294            (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
295
296                 /* Decrease auto_corr values to increase sensitivity */
297                 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
298                 data->auto_corr_cck =
299                         max((u32)ranges->auto_corr_min_cck, val);
300                 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
301                 data->auto_corr_cck_mrc =
302                         max((u32)ranges->auto_corr_min_cck_mrc, val);
303         }
304
305         return 0;
306 }
307
308
309 static int iwl4965_sens_auto_corr_ofdm(struct iwl_priv *priv,
310                                        u32 norm_fa,
311                                        u32 rx_enable_time)
312 {
313         u32 val;
314         u32 false_alarms = norm_fa * 200 * 1024;
315         u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
316         u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
317         struct iwl_sensitivity_data *data = NULL;
318         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
319
320         data = &(priv->sensitivity_data);
321
322         /* If we got too many false alarms this time, reduce sensitivity */
323         if (false_alarms > max_false_alarms) {
324
325                 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u)\n",
326                              false_alarms, max_false_alarms);
327
328                 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
329                 data->auto_corr_ofdm =
330                         min((u32)ranges->auto_corr_max_ofdm, val);
331
332                 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
333                 data->auto_corr_ofdm_mrc =
334                         min((u32)ranges->auto_corr_max_ofdm_mrc, val);
335
336                 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
337                 data->auto_corr_ofdm_x1 =
338                         min((u32)ranges->auto_corr_max_ofdm_x1, val);
339
340                 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
341                 data->auto_corr_ofdm_mrc_x1 =
342                         min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
343         }
344
345         /* Else if we got fewer than desired, increase sensitivity */
346         else if (false_alarms < min_false_alarms) {
347
348                 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u\n",
349                              false_alarms, min_false_alarms);
350
351                 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
352                 data->auto_corr_ofdm =
353                         max((u32)ranges->auto_corr_min_ofdm, val);
354
355                 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
356                 data->auto_corr_ofdm_mrc =
357                         max((u32)ranges->auto_corr_min_ofdm_mrc, val);
358
359                 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
360                 data->auto_corr_ofdm_x1 =
361                         max((u32)ranges->auto_corr_min_ofdm_x1, val);
362
363                 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
364                 data->auto_corr_ofdm_mrc_x1 =
365                         max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
366         } else {
367                 IWL_DEBUG_CALIB(priv, "min FA %u < norm FA %u < max FA %u OK\n",
368                          min_false_alarms, false_alarms, max_false_alarms);
369         }
370         return 0;
371 }
372
373 static void iwl4965_prepare_legacy_sensitivity_tbl(struct iwl_priv *priv,
374                                 struct iwl_sensitivity_data *data,
375                                 __le16 *tbl)
376 {
377         tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
378                                 cpu_to_le16((u16)data->auto_corr_ofdm);
379         tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
380                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
381         tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
382                                 cpu_to_le16((u16)data->auto_corr_ofdm_x1);
383         tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
384                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
385
386         tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
387                                 cpu_to_le16((u16)data->auto_corr_cck);
388         tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
389                                 cpu_to_le16((u16)data->auto_corr_cck_mrc);
390
391         tbl[HD_MIN_ENERGY_CCK_DET_INDEX] =
392                                 cpu_to_le16((u16)data->nrg_th_cck);
393         tbl[HD_MIN_ENERGY_OFDM_DET_INDEX] =
394                                 cpu_to_le16((u16)data->nrg_th_ofdm);
395
396         tbl[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
397                                 cpu_to_le16(data->barker_corr_th_min);
398         tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
399                                 cpu_to_le16(data->barker_corr_th_min_mrc);
400         tbl[HD_OFDM_ENERGY_TH_IN_INDEX] =
401                                 cpu_to_le16(data->nrg_th_cca);
402
403         IWL_DEBUG_CALIB(priv, "ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
404                         data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
405                         data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
406                         data->nrg_th_ofdm);
407
408         IWL_DEBUG_CALIB(priv, "cck: ac %u mrc %u thresh %u\n",
409                         data->auto_corr_cck, data->auto_corr_cck_mrc,
410                         data->nrg_th_cck);
411 }
412
413 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
414 static int iwl4965_sensitivity_write(struct iwl_priv *priv)
415 {
416         struct iwl_sensitivity_cmd cmd;
417         struct iwl_sensitivity_data *data = NULL;
418         struct iwl_host_cmd cmd_out = {
419                 .id = SENSITIVITY_CMD,
420                 .len = sizeof(struct iwl_sensitivity_cmd),
421                 .flags = CMD_ASYNC,
422                 .data = &cmd,
423         };
424
425         data = &(priv->sensitivity_data);
426
427         memset(&cmd, 0, sizeof(cmd));
428
429         iwl4965_prepare_legacy_sensitivity_tbl(priv, data, &cmd.table[0]);
430
431         /* Update uCode's "work" table, and copy it to DSP */
432         cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
433
434         /* Don't send command to uCode if nothing has changed */
435         if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
436                     sizeof(u16)*HD_TABLE_SIZE)) {
437                 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
438                 return 0;
439         }
440
441         /* Copy table for comparison next time */
442         memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
443                sizeof(u16)*HD_TABLE_SIZE);
444
445         return iwl_legacy_send_cmd(priv, &cmd_out);
446 }
447
448 void iwl4965_init_sensitivity(struct iwl_priv *priv)
449 {
450         int ret = 0;
451         int i;
452         struct iwl_sensitivity_data *data = NULL;
453         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
454
455         if (priv->disable_sens_cal)
456                 return;
457
458         IWL_DEBUG_CALIB(priv, "Start iwl4965_init_sensitivity\n");
459
460         /* Clear driver's sensitivity algo data */
461         data = &(priv->sensitivity_data);
462
463         if (ranges == NULL)
464                 return;
465
466         memset(data, 0, sizeof(struct iwl_sensitivity_data));
467
468         data->num_in_cck_no_fa = 0;
469         data->nrg_curr_state = IWL_FA_TOO_MANY;
470         data->nrg_prev_state = IWL_FA_TOO_MANY;
471         data->nrg_silence_ref = 0;
472         data->nrg_silence_idx = 0;
473         data->nrg_energy_idx = 0;
474
475         for (i = 0; i < 10; i++)
476                 data->nrg_value[i] = 0;
477
478         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
479                 data->nrg_silence_rssi[i] = 0;
480
481         data->auto_corr_ofdm =  ranges->auto_corr_min_ofdm;
482         data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
483         data->auto_corr_ofdm_x1  = ranges->auto_corr_min_ofdm_x1;
484         data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
485         data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
486         data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
487         data->nrg_th_cck = ranges->nrg_th_cck;
488         data->nrg_th_ofdm = ranges->nrg_th_ofdm;
489         data->barker_corr_th_min = ranges->barker_corr_th_min;
490         data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc;
491         data->nrg_th_cca = ranges->nrg_th_cca;
492
493         data->last_bad_plcp_cnt_ofdm = 0;
494         data->last_fa_cnt_ofdm = 0;
495         data->last_bad_plcp_cnt_cck = 0;
496         data->last_fa_cnt_cck = 0;
497
498         ret |= iwl4965_sensitivity_write(priv);
499         IWL_DEBUG_CALIB(priv, "<<return 0x%X\n", ret);
500 }
501
502 void iwl4965_sensitivity_calibration(struct iwl_priv *priv, void *resp)
503 {
504         u32 rx_enable_time;
505         u32 fa_cck;
506         u32 fa_ofdm;
507         u32 bad_plcp_cck;
508         u32 bad_plcp_ofdm;
509         u32 norm_fa_ofdm;
510         u32 norm_fa_cck;
511         struct iwl_sensitivity_data *data = NULL;
512         struct statistics_rx_non_phy *rx_info;
513         struct statistics_rx_phy *ofdm, *cck;
514         unsigned long flags;
515         struct statistics_general_data statis;
516
517         if (priv->disable_sens_cal)
518                 return;
519
520         data = &(priv->sensitivity_data);
521
522         if (!iwl_legacy_is_any_associated(priv)) {
523                 IWL_DEBUG_CALIB(priv, "<< - not associated\n");
524                 return;
525         }
526
527         spin_lock_irqsave(&priv->lock, flags);
528
529         rx_info = &(((struct iwl_notif_statistics *)resp)->rx.general);
530         ofdm = &(((struct iwl_notif_statistics *)resp)->rx.ofdm);
531         cck = &(((struct iwl_notif_statistics *)resp)->rx.cck);
532
533         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
534                 IWL_DEBUG_CALIB(priv, "<< invalid data.\n");
535                 spin_unlock_irqrestore(&priv->lock, flags);
536                 return;
537         }
538
539         /* Extract Statistics: */
540         rx_enable_time = le32_to_cpu(rx_info->channel_load);
541         fa_cck = le32_to_cpu(cck->false_alarm_cnt);
542         fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt);
543         bad_plcp_cck = le32_to_cpu(cck->plcp_err);
544         bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err);
545
546         statis.beacon_silence_rssi_a =
547                         le32_to_cpu(rx_info->beacon_silence_rssi_a);
548         statis.beacon_silence_rssi_b =
549                         le32_to_cpu(rx_info->beacon_silence_rssi_b);
550         statis.beacon_silence_rssi_c =
551                         le32_to_cpu(rx_info->beacon_silence_rssi_c);
552         statis.beacon_energy_a =
553                         le32_to_cpu(rx_info->beacon_energy_a);
554         statis.beacon_energy_b =
555                         le32_to_cpu(rx_info->beacon_energy_b);
556         statis.beacon_energy_c =
557                         le32_to_cpu(rx_info->beacon_energy_c);
558
559         spin_unlock_irqrestore(&priv->lock, flags);
560
561         IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time);
562
563         if (!rx_enable_time) {
564                 IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0!\n");
565                 return;
566         }
567
568         /* These statistics increase monotonically, and do not reset
569          *   at each beacon.  Calculate difference from last value, or just
570          *   use the new statistics value if it has reset or wrapped around. */
571         if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
572                 data->last_bad_plcp_cnt_cck = bad_plcp_cck;
573         else {
574                 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
575                 data->last_bad_plcp_cnt_cck += bad_plcp_cck;
576         }
577
578         if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
579                 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
580         else {
581                 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
582                 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
583         }
584
585         if (data->last_fa_cnt_ofdm > fa_ofdm)
586                 data->last_fa_cnt_ofdm = fa_ofdm;
587         else {
588                 fa_ofdm -= data->last_fa_cnt_ofdm;
589                 data->last_fa_cnt_ofdm += fa_ofdm;
590         }
591
592         if (data->last_fa_cnt_cck > fa_cck)
593                 data->last_fa_cnt_cck = fa_cck;
594         else {
595                 fa_cck -= data->last_fa_cnt_cck;
596                 data->last_fa_cnt_cck += fa_cck;
597         }
598
599         /* Total aborted signal locks */
600         norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
601         norm_fa_cck = fa_cck + bad_plcp_cck;
602
603         IWL_DEBUG_CALIB(priv,
604                          "cck: fa %u badp %u  ofdm: fa %u badp %u\n", fa_cck,
605                         bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
606
607         iwl4965_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
608         iwl4965_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
609
610         iwl4965_sensitivity_write(priv);
611 }
612
613 static inline u8 iwl4965_find_first_chain(u8 mask)
614 {
615         if (mask & ANT_A)
616                 return CHAIN_A;
617         if (mask & ANT_B)
618                 return CHAIN_B;
619         return CHAIN_C;
620 }
621
622 /**
623  * Run disconnected antenna algorithm to find out which antennas are
624  * disconnected.
625  */
626 static void
627 iwl4965_find_disconn_antenna(struct iwl_priv *priv, u32* average_sig,
628                                      struct iwl_chain_noise_data *data)
629 {
630         u32 active_chains = 0;
631         u32 max_average_sig;
632         u16 max_average_sig_antenna_i;
633         u8 num_tx_chains;
634         u8 first_chain;
635         u16 i = 0;
636
637         average_sig[0] = data->chain_signal_a /
638                          priv->cfg->base_params->chain_noise_num_beacons;
639         average_sig[1] = data->chain_signal_b /
640                          priv->cfg->base_params->chain_noise_num_beacons;
641         average_sig[2] = data->chain_signal_c /
642                          priv->cfg->base_params->chain_noise_num_beacons;
643
644         if (average_sig[0] >= average_sig[1]) {
645                 max_average_sig = average_sig[0];
646                 max_average_sig_antenna_i = 0;
647                 active_chains = (1 << max_average_sig_antenna_i);
648         } else {
649                 max_average_sig = average_sig[1];
650                 max_average_sig_antenna_i = 1;
651                 active_chains = (1 << max_average_sig_antenna_i);
652         }
653
654         if (average_sig[2] >= max_average_sig) {
655                 max_average_sig = average_sig[2];
656                 max_average_sig_antenna_i = 2;
657                 active_chains = (1 << max_average_sig_antenna_i);
658         }
659
660         IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n",
661                      average_sig[0], average_sig[1], average_sig[2]);
662         IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n",
663                      max_average_sig, max_average_sig_antenna_i);
664
665         /* Compare signal strengths for all 3 receivers. */
666         for (i = 0; i < NUM_RX_CHAINS; i++) {
667                 if (i != max_average_sig_antenna_i) {
668                         s32 rssi_delta = (max_average_sig - average_sig[i]);
669
670                         /* If signal is very weak, compared with
671                          * strongest, mark it as disconnected. */
672                         if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
673                                 data->disconn_array[i] = 1;
674                         else
675                                 active_chains |= (1 << i);
676                         IWL_DEBUG_CALIB(priv, "i = %d  rssiDelta = %d  "
677                              "disconn_array[i] = %d\n",
678                              i, rssi_delta, data->disconn_array[i]);
679                 }
680         }
681
682         /*
683          * The above algorithm sometimes fails when the ucode
684          * reports 0 for all chains. It's not clear why that
685          * happens to start with, but it is then causing trouble
686          * because this can make us enable more chains than the
687          * hardware really has.
688          *
689          * To be safe, simply mask out any chains that we know
690          * are not on the device.
691          */
692         active_chains &= priv->hw_params.valid_rx_ant;
693
694         num_tx_chains = 0;
695         for (i = 0; i < NUM_RX_CHAINS; i++) {
696                 /* loops on all the bits of
697                  * priv->hw_setting.valid_tx_ant */
698                 u8 ant_msk = (1 << i);
699                 if (!(priv->hw_params.valid_tx_ant & ant_msk))
700                         continue;
701
702                 num_tx_chains++;
703                 if (data->disconn_array[i] == 0)
704                         /* there is a Tx antenna connected */
705                         break;
706                 if (num_tx_chains == priv->hw_params.tx_chains_num &&
707                     data->disconn_array[i]) {
708                         /*
709                          * If all chains are disconnected
710                          * connect the first valid tx chain
711                          */
712                         first_chain =
713                         iwl4965_find_first_chain(priv->cfg->valid_tx_ant);
714                         data->disconn_array[first_chain] = 0;
715                         active_chains |= BIT(first_chain);
716                         IWL_DEBUG_CALIB(priv,
717                                         "All Tx chains are disconnected W/A - declare %d as connected\n",
718                                         first_chain);
719                         break;
720                 }
721         }
722
723         if (active_chains != priv->hw_params.valid_rx_ant &&
724             active_chains != priv->chain_noise_data.active_chains)
725                 IWL_DEBUG_CALIB(priv,
726                                 "Detected that not all antennas are connected! "
727                                 "Connected: %#x, valid: %#x.\n",
728                                 active_chains, priv->hw_params.valid_rx_ant);
729
730         /* Save for use within RXON, TX, SCAN commands, etc. */
731         data->active_chains = active_chains;
732         IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",
733                         active_chains);
734 }
735
736 static void iwl4965_gain_computation(struct iwl_priv *priv,
737                 u32 *average_noise,
738                 u16 min_average_noise_antenna_i,
739                 u32 min_average_noise,
740                 u8 default_chain)
741 {
742         int i, ret;
743         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
744
745         data->delta_gain_code[min_average_noise_antenna_i] = 0;
746
747         for (i = default_chain; i < NUM_RX_CHAINS; i++) {
748                 s32 delta_g = 0;
749
750                 if (!(data->disconn_array[i]) &&
751                     (data->delta_gain_code[i] ==
752                              CHAIN_NOISE_DELTA_GAIN_INIT_VAL)) {
753                         delta_g = average_noise[i] - min_average_noise;
754                         data->delta_gain_code[i] = (u8)((delta_g * 10) / 15);
755                         data->delta_gain_code[i] =
756                                 min(data->delta_gain_code[i],
757                                 (u8) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);
758
759                         data->delta_gain_code[i] =
760                                 (data->delta_gain_code[i] | (1 << 2));
761                 } else {
762                         data->delta_gain_code[i] = 0;
763                 }
764         }
765         IWL_DEBUG_CALIB(priv, "delta_gain_codes: a %d b %d c %d\n",
766                      data->delta_gain_code[0],
767                      data->delta_gain_code[1],
768                      data->delta_gain_code[2]);
769
770         /* Differential gain gets sent to uCode only once */
771         if (!data->radio_write) {
772                 struct iwl_calib_diff_gain_cmd cmd;
773                 data->radio_write = 1;
774
775                 memset(&cmd, 0, sizeof(cmd));
776                 cmd.hdr.op_code = IWL_PHY_CALIBRATE_DIFF_GAIN_CMD;
777                 cmd.diff_gain_a = data->delta_gain_code[0];
778                 cmd.diff_gain_b = data->delta_gain_code[1];
779                 cmd.diff_gain_c = data->delta_gain_code[2];
780                 ret = iwl_legacy_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
781                                       sizeof(cmd), &cmd);
782                 if (ret)
783                         IWL_DEBUG_CALIB(priv, "fail sending cmd "
784                                      "REPLY_PHY_CALIBRATION_CMD\n");
785
786                 /* TODO we might want recalculate
787                  * rx_chain in rxon cmd */
788
789                 /* Mark so we run this algo only once! */
790                 data->state = IWL_CHAIN_NOISE_CALIBRATED;
791         }
792 }
793
794
795
796 /*
797  * Accumulate 16 beacons of signal and noise statistics for each of
798  *   3 receivers/antennas/rx-chains, then figure out:
799  * 1)  Which antennas are connected.
800  * 2)  Differential rx gain settings to balance the 3 receivers.
801  */
802 void iwl4965_chain_noise_calibration(struct iwl_priv *priv, void *stat_resp)
803 {
804         struct iwl_chain_noise_data *data = NULL;
805
806         u32 chain_noise_a;
807         u32 chain_noise_b;
808         u32 chain_noise_c;
809         u32 chain_sig_a;
810         u32 chain_sig_b;
811         u32 chain_sig_c;
812         u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
813         u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
814         u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
815         u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
816         u16 i = 0;
817         u16 rxon_chnum = INITIALIZATION_VALUE;
818         u16 stat_chnum = INITIALIZATION_VALUE;
819         u8 rxon_band24;
820         u8 stat_band24;
821         unsigned long flags;
822         struct statistics_rx_non_phy *rx_info;
823
824         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
825
826         if (priv->disable_chain_noise_cal)
827                 return;
828
829         data = &(priv->chain_noise_data);
830
831         /*
832          * Accumulate just the first "chain_noise_num_beacons" after
833          * the first association, then we're done forever.
834          */
835         if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
836                 if (data->state == IWL_CHAIN_NOISE_ALIVE)
837                         IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n");
838                 return;
839         }
840
841         spin_lock_irqsave(&priv->lock, flags);
842
843         rx_info = &(((struct iwl_notif_statistics *)stat_resp)->
844                       rx.general);
845
846         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
847                 IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n");
848                 spin_unlock_irqrestore(&priv->lock, flags);
849                 return;
850         }
851
852         rxon_band24 = !!(ctx->staging.flags & RXON_FLG_BAND_24G_MSK);
853         rxon_chnum = le16_to_cpu(ctx->staging.channel);
854
855         stat_band24 = !!(((struct iwl_notif_statistics *)
856                          stat_resp)->flag &
857                          STATISTICS_REPLY_FLG_BAND_24G_MSK);
858         stat_chnum = le32_to_cpu(((struct iwl_notif_statistics *)
859                                  stat_resp)->flag) >> 16;
860
861         /* Make sure we accumulate data for just the associated channel
862          *   (even if scanning). */
863         if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
864                 IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n",
865                                 rxon_chnum, rxon_band24);
866                 spin_unlock_irqrestore(&priv->lock, flags);
867                 return;
868         }
869
870         /*
871          *  Accumulate beacon statistics values across
872          * "chain_noise_num_beacons"
873          */
874         chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
875                                 IN_BAND_FILTER;
876         chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
877                                 IN_BAND_FILTER;
878         chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
879                                 IN_BAND_FILTER;
880
881         chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
882         chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
883         chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
884
885         spin_unlock_irqrestore(&priv->lock, flags);
886
887         data->beacon_count++;
888
889         data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
890         data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
891         data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
892
893         data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
894         data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
895         data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
896
897         IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n",
898                         rxon_chnum, rxon_band24, data->beacon_count);
899         IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n",
900                         chain_sig_a, chain_sig_b, chain_sig_c);
901         IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n",
902                         chain_noise_a, chain_noise_b, chain_noise_c);
903
904         /* If this is the "chain_noise_num_beacons", determine:
905          * 1)  Disconnected antennas (using signal strengths)
906          * 2)  Differential gain (using silence noise) to balance receivers */
907         if (data->beacon_count !=
908                 priv->cfg->base_params->chain_noise_num_beacons)
909                 return;
910
911         /* Analyze signal for disconnected antenna */
912         iwl4965_find_disconn_antenna(priv, average_sig, data);
913
914         /* Analyze noise for rx balance */
915         average_noise[0] = data->chain_noise_a /
916                            priv->cfg->base_params->chain_noise_num_beacons;
917         average_noise[1] = data->chain_noise_b /
918                            priv->cfg->base_params->chain_noise_num_beacons;
919         average_noise[2] = data->chain_noise_c /
920                            priv->cfg->base_params->chain_noise_num_beacons;
921
922         for (i = 0; i < NUM_RX_CHAINS; i++) {
923                 if (!(data->disconn_array[i]) &&
924                    (average_noise[i] <= min_average_noise)) {
925                         /* This means that chain i is active and has
926                          * lower noise values so far: */
927                         min_average_noise = average_noise[i];
928                         min_average_noise_antenna_i = i;
929                 }
930         }
931
932         IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n",
933                         average_noise[0], average_noise[1],
934                         average_noise[2]);
935
936         IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n",
937                         min_average_noise, min_average_noise_antenna_i);
938
939         iwl4965_gain_computation(priv, average_noise,
940                         min_average_noise_antenna_i, min_average_noise,
941                         iwl4965_find_first_chain(priv->cfg->valid_rx_ant));
942
943         /* Some power changes may have been made during the calibration.
944          * Update and commit the RXON
945          */
946         if (priv->cfg->ops->lib->update_chain_flags)
947                 priv->cfg->ops->lib->update_chain_flags(priv);
948
949         data->state = IWL_CHAIN_NOISE_DONE;
950         iwl_legacy_power_update_mode(priv, false);
951 }
952
953 void iwl4965_reset_run_time_calib(struct iwl_priv *priv)
954 {
955         int i;
956         memset(&(priv->sensitivity_data), 0,
957                sizeof(struct iwl_sensitivity_data));
958         memset(&(priv->chain_noise_data), 0,
959                sizeof(struct iwl_chain_noise_data));
960         for (i = 0; i < NUM_RX_CHAINS; i++)
961                 priv->chain_noise_data.delta_gain_code[i] =
962                                 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
963
964         /* Ask for statistics now, the uCode will send notification
965          * periodically after association */
966         iwl_legacy_send_statistics_request(priv, CMD_ASYNC, true);
967 }