1 /*
2 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
3 * Copyright (c) 2002-2008 Atheros Communications, Inc.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 *
17 * $FreeBSD$
18 */
19 #include "opt_ah.h"
20
21 #include "ah.h"
22 #include "ah_internal.h"
23 #include "ah_devid.h"
24
25 #include "ah_eeprom_v14.h"
26
27 #include "ar5212/ar5212.h" /* for NF cal related declarations */
28
29 #include "ar5416/ar5416.h"
30 #include "ar5416/ar5416reg.h"
31 #include "ar5416/ar5416phy.h"
32
33 /* Owl specific stuff */
34 #define NUM_NOISEFLOOR_READINGS 6 /* 3 chains * (ctl + ext) */
35
36 static void ar5416StartNFCal(struct ath_hal *ah);
37 static void ar5416LoadNF(struct ath_hal *ah, const struct ieee80211_channel *);
38 static int16_t ar5416GetNf(struct ath_hal *, struct ieee80211_channel *);
39
40 static uint16_t ar5416GetDefaultNF(struct ath_hal *ah, const struct ieee80211_channel *chan);
41 static void ar5416SanitizeNF(struct ath_hal *ah, int16_t *nf);
42
43 /*
44 * Determine if calibration is supported by device and channel flags
45 */
46
47 /*
48 * ADC GAIN/DC offset calibration is for calibrating two ADCs that
49 * are acting as one by interleaving incoming symbols. This isn't
50 * relevant for 2.4GHz 20MHz wide modes because, as far as I can tell,
51 * the secondary ADC is never enabled. It is enabled however for
52 * 5GHz modes.
53 *
54 * It hasn't been confirmed whether doing this calibration is needed
55 * at all in the above modes and/or whether it's actually harmful.
56 * So for now, let's leave it enabled and just remember to get
57 * confirmation that it needs to be clarified.
58 *
59 * See US Patent No: US 7,541,952 B1:
60 * " Method and Apparatus for Offset and Gain Compensation for
61 * Analog-to-Digital Converters."
62 */
63 static OS_INLINE HAL_BOOL
ar5416IsCalSupp(struct ath_hal * ah,const struct ieee80211_channel * chan,HAL_CAL_TYPE calType)64 ar5416IsCalSupp(struct ath_hal *ah, const struct ieee80211_channel *chan,
65 HAL_CAL_TYPE calType)
66 {
67 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
68
69 switch (calType & cal->suppCals) {
70 case IQ_MISMATCH_CAL:
71 /* Run IQ Mismatch for non-CCK only */
72 return !IEEE80211_IS_CHAN_B(chan);
73 case ADC_GAIN_CAL:
74 case ADC_DC_CAL:
75 /*
76 * Run ADC Gain Cal for either 5ghz any or 2ghz HT40.
77 *
78 * Don't run ADC calibrations for 5ghz fast clock mode
79 * in HT20 - only one ADC is used.
80 */
81 if (IEEE80211_IS_CHAN_HT20(chan) &&
82 (IS_5GHZ_FAST_CLOCK_EN(ah, chan)))
83 return AH_FALSE;
84 if (IEEE80211_IS_CHAN_5GHZ(chan))
85 return AH_TRUE;
86 if (IEEE80211_IS_CHAN_HT40(chan))
87 return AH_TRUE;
88 return AH_FALSE;
89 }
90 return AH_FALSE;
91 }
92
93 /*
94 * Setup HW to collect samples used for current cal
95 */
96 static void
ar5416SetupMeasurement(struct ath_hal * ah,HAL_CAL_LIST * currCal)97 ar5416SetupMeasurement(struct ath_hal *ah, HAL_CAL_LIST *currCal)
98 {
99 /* Start calibration w/ 2^(INIT_IQCAL_LOG_COUNT_MAX+1) samples */
100 OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4,
101 AR_PHY_TIMING_CTRL4_IQCAL_LOG_COUNT_MAX,
102 currCal->calData->calCountMax);
103
104 /* Select calibration to run */
105 switch (currCal->calData->calType) {
106 case IQ_MISMATCH_CAL:
107 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_IQ);
108 HALDEBUG(ah, HAL_DEBUG_PERCAL,
109 "%s: start IQ Mismatch calibration\n", __func__);
110 break;
111 case ADC_GAIN_CAL:
112 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_GAIN);
113 HALDEBUG(ah, HAL_DEBUG_PERCAL,
114 "%s: start ADC Gain calibration\n", __func__);
115 break;
116 case ADC_DC_CAL:
117 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_DC_PER);
118 HALDEBUG(ah, HAL_DEBUG_PERCAL,
119 "%s: start ADC DC calibration\n", __func__);
120 break;
121 case ADC_DC_INIT_CAL:
122 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_DC_INIT);
123 HALDEBUG(ah, HAL_DEBUG_PERCAL,
124 "%s: start Init ADC DC calibration\n", __func__);
125 break;
126 }
127 /* Kick-off cal */
128 OS_REG_SET_BIT(ah, AR_PHY_TIMING_CTRL4, AR_PHY_TIMING_CTRL4_DO_CAL);
129 }
130
131 /*
132 * Initialize shared data structures and prepare a cal to be run.
133 */
134 static void
ar5416ResetMeasurement(struct ath_hal * ah,HAL_CAL_LIST * currCal)135 ar5416ResetMeasurement(struct ath_hal *ah, HAL_CAL_LIST *currCal)
136 {
137 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
138
139 /* Reset data structures shared between different calibrations */
140 OS_MEMZERO(cal->caldata, sizeof(cal->caldata));
141 cal->calSamples = 0;
142
143 /* Setup HW for new calibration */
144 ar5416SetupMeasurement(ah, currCal);
145
146 /* Change SW state to RUNNING for this calibration */
147 currCal->calState = CAL_RUNNING;
148 }
149
150 #if 0
151 /*
152 * Run non-periodic calibrations.
153 */
154 static HAL_BOOL
155 ar5416RunInitCals(struct ath_hal *ah, int init_cal_count)
156 {
157 struct ath_hal_5416 *ahp = AH5416(ah);
158 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
159 HAL_CHANNEL_INTERNAL ichan; /* XXX bogus */
160 HAL_CAL_LIST *curCal = ahp->ah_cal_curr;
161 HAL_BOOL isCalDone;
162 int i;
163
164 if (curCal == AH_NULL)
165 return AH_FALSE;
166
167 ichan.calValid = 0;
168 for (i = 0; i < init_cal_count; i++) {
169 /* Reset this Cal */
170 ar5416ResetMeasurement(ah, curCal);
171 /* Poll for offset calibration complete */
172 if (!ath_hal_wait(ah, AR_PHY_TIMING_CTRL4, AR_PHY_TIMING_CTRL4_DO_CAL, 0)) {
173 HALDEBUG(ah, HAL_DEBUG_ANY,
174 "%s: Cal %d failed to finish in 100ms.\n",
175 __func__, curCal->calData->calType);
176 /* Re-initialize list pointers for periodic cals */
177 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL;
178 return AH_FALSE;
179 }
180 /* Run this cal */
181 ar5416DoCalibration(ah, &ichan, ahp->ah_rxchainmask,
182 curCal, &isCalDone);
183 if (!isCalDone)
184 HALDEBUG(ah, HAL_DEBUG_ANY,
185 "%s: init cal %d did not complete.\n",
186 __func__, curCal->calData->calType);
187 if (curCal->calNext != AH_NULL)
188 curCal = curCal->calNext;
189 }
190
191 /* Re-initialize list pointers for periodic cals */
192 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL;
193 return AH_TRUE;
194 }
195 #endif
196
197
198 /*
199 * AGC calibration for the AR5416, AR9130, AR9160, AR9280.
200 */
201 HAL_BOOL
ar5416InitCalHardware(struct ath_hal * ah,const struct ieee80211_channel * chan)202 ar5416InitCalHardware(struct ath_hal *ah, const struct ieee80211_channel *chan)
203 {
204
205 if (AR_SREV_MERLIN_10_OR_LATER(ah)) {
206 /* Disable ADC */
207 OS_REG_CLR_BIT(ah, AR_PHY_ADC_CTL,
208 AR_PHY_ADC_CTL_OFF_PWDADC);
209
210 /* Enable Rx Filter Cal */
211 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
212 AR_PHY_AGC_CONTROL_FLTR_CAL);
213 }
214
215 /* Calibrate the AGC */
216 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL);
217
218 /* Poll for offset calibration complete */
219 if (!ath_hal_wait(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL, 0)) {
220 HALDEBUG(ah, HAL_DEBUG_ANY,
221 "%s: offset calibration did not complete in 1ms; "
222 "noisy environment?\n", __func__);
223 return AH_FALSE;
224 }
225
226 if (AR_SREV_MERLIN_10_OR_LATER(ah)) {
227 /* Enable ADC */
228 OS_REG_SET_BIT(ah, AR_PHY_ADC_CTL,
229 AR_PHY_ADC_CTL_OFF_PWDADC);
230
231 /* Disable Rx Filter Cal */
232 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
233 AR_PHY_AGC_CONTROL_FLTR_CAL);
234 }
235
236 return AH_TRUE;
237 }
238
239 /*
240 * Initialize Calibration infrastructure.
241 */
242 #define MAX_CAL_CHECK 32
243 HAL_BOOL
ar5416InitCal(struct ath_hal * ah,const struct ieee80211_channel * chan)244 ar5416InitCal(struct ath_hal *ah, const struct ieee80211_channel *chan)
245 {
246 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
247 HAL_CHANNEL_INTERNAL *ichan;
248
249 ichan = ath_hal_checkchannel(ah, chan);
250 HALASSERT(ichan != AH_NULL);
251
252 /* Do initial chipset-specific calibration */
253 if (! AH5416(ah)->ah_cal_initcal(ah, chan)) {
254 HALDEBUG(ah, HAL_DEBUG_ANY,
255 "%s: initial chipset calibration did "
256 "not complete in time; noisy environment?\n", __func__);
257 return AH_FALSE;
258 }
259
260 /* If there's PA Cal, do it */
261 if (AH5416(ah)->ah_cal_pacal)
262 AH5416(ah)->ah_cal_pacal(ah, AH_TRUE);
263
264 /*
265 * Do NF calibration after DC offset and other CALs.
266 * Per system engineers, noise floor value can sometimes be 20 dB
267 * higher than normal value if DC offset and noise floor cal are
268 * triggered at the same time.
269 */
270 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
271
272 /*
273 * This may take a while to run; make sure subsequent
274 * calibration routines check that this has completed
275 * before reading the value and triggering a subsequent
276 * calibration.
277 */
278
279 /* Initialize list pointers */
280 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL;
281
282 /*
283 * Enable IQ, ADC Gain, ADC DC Offset Cals
284 */
285 if (AR_SREV_HOWL(ah) || AR_SREV_SOWL_10_OR_LATER(ah)) {
286 /* Setup all non-periodic, init time only calibrations */
287 /* XXX: Init DC Offset not working yet */
288 #if 0
289 if (ar5416IsCalSupp(ah, chan, ADC_DC_INIT_CAL)) {
290 INIT_CAL(&cal->adcDcCalInitData);
291 INSERT_CAL(cal, &cal->adcDcCalInitData);
292 }
293 /* Initialize current pointer to first element in list */
294 cal->cal_curr = cal->cal_list;
295
296 if (cal->ah_cal_curr != AH_NULL && !ar5416RunInitCals(ah, 0))
297 return AH_FALSE;
298 #endif
299 }
300
301 /* If Cals are supported, add them to list via INIT/INSERT_CAL */
302 if (ar5416IsCalSupp(ah, chan, ADC_GAIN_CAL)) {
303 INIT_CAL(&cal->adcGainCalData);
304 INSERT_CAL(cal, &cal->adcGainCalData);
305 HALDEBUG(ah, HAL_DEBUG_PERCAL,
306 "%s: enable ADC Gain Calibration.\n", __func__);
307 }
308 if (ar5416IsCalSupp(ah, chan, ADC_DC_CAL)) {
309 INIT_CAL(&cal->adcDcCalData);
310 INSERT_CAL(cal, &cal->adcDcCalData);
311 HALDEBUG(ah, HAL_DEBUG_PERCAL,
312 "%s: enable ADC DC Calibration.\n", __func__);
313 }
314 if (ar5416IsCalSupp(ah, chan, IQ_MISMATCH_CAL)) {
315 INIT_CAL(&cal->iqCalData);
316 INSERT_CAL(cal, &cal->iqCalData);
317 HALDEBUG(ah, HAL_DEBUG_PERCAL,
318 "%s: enable IQ Calibration.\n", __func__);
319 }
320 /* Initialize current pointer to first element in list */
321 cal->cal_curr = cal->cal_list;
322
323 /* Kick off measurements for the first cal */
324 if (cal->cal_curr != AH_NULL)
325 ar5416ResetMeasurement(ah, cal->cal_curr);
326
327 /* Mark all calibrations on this channel as being invalid */
328 ichan->calValid = 0;
329
330 return AH_TRUE;
331 #undef MAX_CAL_CHECK
332 }
333
334 /*
335 * Entry point for upper layers to restart current cal.
336 * Reset the calibration valid bit in channel.
337 */
338 HAL_BOOL
ar5416ResetCalValid(struct ath_hal * ah,const struct ieee80211_channel * chan)339 ar5416ResetCalValid(struct ath_hal *ah, const struct ieee80211_channel *chan)
340 {
341 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
342 HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan);
343 HAL_CAL_LIST *currCal = cal->cal_curr;
344
345 if (!AR_SREV_SOWL_10_OR_LATER(ah))
346 return AH_FALSE;
347 if (currCal == AH_NULL)
348 return AH_FALSE;
349 if (ichan == AH_NULL) {
350 HALDEBUG(ah, HAL_DEBUG_ANY,
351 "%s: invalid channel %u/0x%x; no mapping\n",
352 __func__, chan->ic_freq, chan->ic_flags);
353 return AH_FALSE;
354 }
355 /*
356 * Expected that this calibration has run before, post-reset.
357 * Current state should be done
358 */
359 if (currCal->calState != CAL_DONE) {
360 HALDEBUG(ah, HAL_DEBUG_ANY,
361 "%s: Calibration state incorrect, %d\n",
362 __func__, currCal->calState);
363 return AH_FALSE;
364 }
365
366 /* Verify Cal is supported on this channel */
367 if (!ar5416IsCalSupp(ah, chan, currCal->calData->calType))
368 return AH_FALSE;
369
370 HALDEBUG(ah, HAL_DEBUG_PERCAL,
371 "%s: Resetting Cal %d state for channel %u/0x%x\n",
372 __func__, currCal->calData->calType, chan->ic_freq,
373 chan->ic_flags);
374
375 /* Disable cal validity in channel */
376 ichan->calValid &= ~currCal->calData->calType;
377 currCal->calState = CAL_WAITING;
378
379 return AH_TRUE;
380 }
381
382 /*
383 * Recalibrate the lower PHY chips to account for temperature/environment
384 * changes.
385 */
386 static void
ar5416DoCalibration(struct ath_hal * ah,HAL_CHANNEL_INTERNAL * ichan,uint8_t rxchainmask,HAL_CAL_LIST * currCal,HAL_BOOL * isCalDone)387 ar5416DoCalibration(struct ath_hal *ah, HAL_CHANNEL_INTERNAL *ichan,
388 uint8_t rxchainmask, HAL_CAL_LIST *currCal, HAL_BOOL *isCalDone)
389 {
390 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
391
392 /* Cal is assumed not done until explicitly set below */
393 *isCalDone = AH_FALSE;
394
395 HALDEBUG(ah, HAL_DEBUG_PERCAL,
396 "%s: %s Calibration, state %d, calValid 0x%x\n",
397 __func__, currCal->calData->calName, currCal->calState,
398 ichan->calValid);
399
400 /* Calibration in progress. */
401 if (currCal->calState == CAL_RUNNING) {
402 /* Check to see if it has finished. */
403 if (!(OS_REG_READ(ah, AR_PHY_TIMING_CTRL4) & AR_PHY_TIMING_CTRL4_DO_CAL)) {
404 HALDEBUG(ah, HAL_DEBUG_PERCAL,
405 "%s: sample %d of %d finished\n",
406 __func__, cal->calSamples,
407 currCal->calData->calNumSamples);
408 /*
409 * Collect measurements for active chains.
410 */
411 currCal->calData->calCollect(ah);
412 if (++cal->calSamples >= currCal->calData->calNumSamples) {
413 int i, numChains = 0;
414 for (i = 0; i < AR5416_MAX_CHAINS; i++) {
415 if (rxchainmask & (1 << i))
416 numChains++;
417 }
418 /*
419 * Process accumulated data
420 */
421 currCal->calData->calPostProc(ah, numChains);
422
423 /* Calibration has finished. */
424 ichan->calValid |= currCal->calData->calType;
425 currCal->calState = CAL_DONE;
426 *isCalDone = AH_TRUE;
427 } else {
428 /*
429 * Set-up to collect of another sub-sample.
430 */
431 ar5416SetupMeasurement(ah, currCal);
432 }
433 }
434 } else if (!(ichan->calValid & currCal->calData->calType)) {
435 /* If current cal is marked invalid in channel, kick it off */
436 ar5416ResetMeasurement(ah, currCal);
437 }
438 }
439
440 /*
441 * Internal interface to schedule periodic calibration work.
442 */
443 HAL_BOOL
ar5416PerCalibrationN(struct ath_hal * ah,struct ieee80211_channel * chan,u_int rxchainmask,HAL_BOOL longcal,HAL_BOOL * isCalDone)444 ar5416PerCalibrationN(struct ath_hal *ah, struct ieee80211_channel *chan,
445 u_int rxchainmask, HAL_BOOL longcal, HAL_BOOL *isCalDone)
446 {
447 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
448 HAL_CAL_LIST *currCal = cal->cal_curr;
449 HAL_CHANNEL_INTERNAL *ichan;
450 int r;
451
452 OS_MARK(ah, AH_MARK_PERCAL, chan->ic_freq);
453
454 *isCalDone = AH_TRUE;
455
456 /*
457 * Since ath_hal calls the PerCal method with rxchainmask=0x1;
458 * override it with the current chainmask. The upper levels currently
459 * doesn't know about the chainmask.
460 */
461 rxchainmask = AH5416(ah)->ah_rx_chainmask;
462
463 /* Invalid channel check */
464 ichan = ath_hal_checkchannel(ah, chan);
465 if (ichan == AH_NULL) {
466 HALDEBUG(ah, HAL_DEBUG_ANY,
467 "%s: invalid channel %u/0x%x; no mapping\n",
468 __func__, chan->ic_freq, chan->ic_flags);
469 return AH_FALSE;
470 }
471
472 /*
473 * For given calibration:
474 * 1. Call generic cal routine
475 * 2. When this cal is done (isCalDone) if we have more cals waiting
476 * (eg after reset), mask this to upper layers by not propagating
477 * isCalDone if it is set to TRUE.
478 * Instead, change isCalDone to FALSE and setup the waiting cal(s)
479 * to be run.
480 */
481 if (currCal != AH_NULL &&
482 (currCal->calState == CAL_RUNNING ||
483 currCal->calState == CAL_WAITING)) {
484 ar5416DoCalibration(ah, ichan, rxchainmask, currCal, isCalDone);
485 if (*isCalDone == AH_TRUE) {
486 cal->cal_curr = currCal = currCal->calNext;
487 if (currCal->calState == CAL_WAITING) {
488 *isCalDone = AH_FALSE;
489 ar5416ResetMeasurement(ah, currCal);
490 }
491 }
492 }
493
494 /* Do NF cal only at longer intervals */
495 if (longcal) {
496 /* Do PA calibration if the chipset supports */
497 if (AH5416(ah)->ah_cal_pacal)
498 AH5416(ah)->ah_cal_pacal(ah, AH_FALSE);
499
500 /* Do open-loop temperature compensation if the chipset needs it */
501 if (ath_hal_eepromGetFlag(ah, AR_EEP_OL_PWRCTRL))
502 AH5416(ah)->ah_olcTempCompensation(ah);
503
504 /*
505 * Get the value from the previous NF cal
506 * and update the history buffer.
507 */
508 r = ar5416GetNf(ah, chan);
509 if (r == 0 || r == -1) {
510 /* NF calibration result isn't valid */
511 HALDEBUG(ah, HAL_DEBUG_UNMASKABLE, "%s: NF calibration"
512 " didn't finish; delaying CCA\n", __func__);
513 } else {
514 /*
515 * NF calibration result is valid.
516 *
517 * Load the NF from history buffer of the current channel.
518 * NF is slow time-variant, so it is OK to use a
519 * historical value.
520 */
521 ar5416LoadNF(ah, AH_PRIVATE(ah)->ah_curchan);
522
523 /* start NF calibration, without updating BB NF register*/
524 ar5416StartNFCal(ah);
525 }
526 }
527 return AH_TRUE;
528 }
529
530 /*
531 * Recalibrate the lower PHY chips to account for temperature/environment
532 * changes.
533 */
534 HAL_BOOL
ar5416PerCalibration(struct ath_hal * ah,struct ieee80211_channel * chan,HAL_BOOL * isIQdone)535 ar5416PerCalibration(struct ath_hal *ah, struct ieee80211_channel *chan,
536 HAL_BOOL *isIQdone)
537 {
538 struct ath_hal_5416 *ahp = AH5416(ah);
539 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
540 HAL_CAL_LIST *curCal = cal->cal_curr;
541
542 if (curCal != AH_NULL && curCal->calData->calType == IQ_MISMATCH_CAL) {
543 return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask,
544 AH_TRUE, isIQdone);
545 } else {
546 HAL_BOOL isCalDone;
547
548 *isIQdone = AH_FALSE;
549 return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask,
550 AH_TRUE, &isCalDone);
551 }
552 }
553
554 static HAL_BOOL
ar5416GetEepromNoiseFloorThresh(struct ath_hal * ah,const struct ieee80211_channel * chan,int16_t * nft)555 ar5416GetEepromNoiseFloorThresh(struct ath_hal *ah,
556 const struct ieee80211_channel *chan, int16_t *nft)
557 {
558 if (IEEE80211_IS_CHAN_5GHZ(chan)) {
559 ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_5, nft);
560 return AH_TRUE;
561 }
562 if (IEEE80211_IS_CHAN_2GHZ(chan)) {
563 ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_2, nft);
564 return AH_TRUE;
565 }
566 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: invalid channel flags 0x%x\n",
567 __func__, chan->ic_flags);
568 return AH_FALSE;
569 }
570
571 static void
ar5416StartNFCal(struct ath_hal * ah)572 ar5416StartNFCal(struct ath_hal *ah)
573 {
574 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF);
575 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
576 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
577 }
578
579 static void
ar5416LoadNF(struct ath_hal * ah,const struct ieee80211_channel * chan)580 ar5416LoadNF(struct ath_hal *ah, const struct ieee80211_channel *chan)
581 {
582 static const uint32_t ar5416_cca_regs[] = {
583 AR_PHY_CCA,
584 AR_PHY_CH1_CCA,
585 AR_PHY_CH2_CCA,
586 AR_PHY_EXT_CCA,
587 AR_PHY_CH1_EXT_CCA,
588 AR_PHY_CH2_EXT_CCA
589 };
590 struct ar5212NfCalHist *h;
591 int i;
592 int32_t val;
593 uint8_t chainmask;
594 int16_t default_nf = ar5416GetDefaultNF(ah, chan);
595
596 /*
597 * Force NF calibration for all chains.
598 */
599 if (AR_SREV_KITE(ah)) {
600 /* Kite has only one chain */
601 chainmask = 0x9;
602 } else if (AR_SREV_MERLIN(ah) || AR_SREV_KIWI(ah)) {
603 /* Merlin/Kiwi has only two chains */
604 chainmask = 0x1B;
605 } else {
606 chainmask = 0x3F;
607 }
608
609 /*
610 * Write filtered NF values into maxCCApwr register parameter
611 * so we can load below.
612 */
613 h = AH5416(ah)->ah_cal.nfCalHist;
614 HALDEBUG(ah, HAL_DEBUG_NFCAL, "CCA: ");
615 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) {
616
617 /* Don't write to EXT radio CCA registers unless in HT/40 mode */
618 /* XXX this check should really be cleaner! */
619 if (i > 2 && !IEEE80211_IS_CHAN_HT40(chan))
620 continue;
621
622 if (chainmask & (1 << i)) {
623 int16_t nf_val;
624
625 if (h)
626 nf_val = h[i].privNF;
627 else
628 nf_val = default_nf;
629
630 val = OS_REG_READ(ah, ar5416_cca_regs[i]);
631 val &= 0xFFFFFE00;
632 val |= (((uint32_t) nf_val << 1) & 0x1ff);
633 HALDEBUG(ah, HAL_DEBUG_NFCAL, "[%d: %d]", i, nf_val);
634 OS_REG_WRITE(ah, ar5416_cca_regs[i], val);
635 }
636 }
637 HALDEBUG(ah, HAL_DEBUG_NFCAL, "\n");
638
639 /* Load software filtered NF value into baseband internal minCCApwr variable. */
640 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF);
641 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
642 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
643
644 /* Wait for load to complete, should be fast, a few 10s of us. */
645 if (! ar5212WaitNFCalComplete(ah, 1000)) {
646 /*
647 * We timed out waiting for the noisefloor to load, probably due to an
648 * in-progress rx. Simply return here and allow the load plenty of time
649 * to complete before the next calibration interval. We need to avoid
650 * trying to load -50 (which happens below) while the previous load is
651 * still in progress as this can cause rx deafness. Instead by returning
652 * here, the baseband nf cal will just be capped by our present
653 * noisefloor until the next calibration timer.
654 */
655 HALDEBUG(ah, HAL_DEBUG_UNMASKABLE, "Timeout while waiting for "
656 "nf to load: AR_PHY_AGC_CONTROL=0x%x\n",
657 OS_REG_READ(ah, AR_PHY_AGC_CONTROL));
658 return;
659 }
660
661 /*
662 * Restore maxCCAPower register parameter again so that we're not capped
663 * by the median we just loaded. This will be initial (and max) value
664 * of next noise floor calibration the baseband does.
665 */
666 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) {
667
668 /* Don't write to EXT radio CCA registers unless in HT/40 mode */
669 /* XXX this check should really be cleaner! */
670 if (i > 2 && !IEEE80211_IS_CHAN_HT40(chan))
671 continue;
672
673 if (chainmask & (1 << i)) {
674 val = OS_REG_READ(ah, ar5416_cca_regs[i]);
675 val &= 0xFFFFFE00;
676 val |= (((uint32_t)(-50) << 1) & 0x1ff);
677 OS_REG_WRITE(ah, ar5416_cca_regs[i], val);
678 }
679 }
680 }
681
682 /*
683 * This just initialises the "good" values for AR5416 which
684 * may not be right; it'lll be overridden by ar5416SanitizeNF()
685 * to nominal values.
686 */
687 void
ar5416InitNfHistBuff(struct ar5212NfCalHist * h)688 ar5416InitNfHistBuff(struct ar5212NfCalHist *h)
689 {
690 int i, j;
691
692 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) {
693 h[i].currIndex = 0;
694 h[i].privNF = AR5416_CCA_MAX_GOOD_VALUE;
695 h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX;
696 for (j = 0; j < AR512_NF_CAL_HIST_MAX; j ++)
697 h[i].nfCalBuffer[j] = AR5416_CCA_MAX_GOOD_VALUE;
698 }
699 }
700
701 /*
702 * Update the noise floor buffer as a ring buffer
703 */
704 static void
ar5416UpdateNFHistBuff(struct ath_hal * ah,struct ar5212NfCalHist * h,int16_t * nfarray)705 ar5416UpdateNFHistBuff(struct ath_hal *ah, struct ar5212NfCalHist *h,
706 int16_t *nfarray)
707 {
708 int i;
709
710 /* XXX TODO: don't record nfarray[] entries for inactive chains */
711 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) {
712 h[i].nfCalBuffer[h[i].currIndex] = nfarray[i];
713
714 if (++h[i].currIndex >= AR512_NF_CAL_HIST_MAX)
715 h[i].currIndex = 0;
716 if (h[i].invalidNFcount > 0) {
717 if (nfarray[i] < AR5416_CCA_MIN_BAD_VALUE ||
718 nfarray[i] > AR5416_CCA_MAX_HIGH_VALUE) {
719 h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX;
720 } else {
721 h[i].invalidNFcount--;
722 h[i].privNF = nfarray[i];
723 }
724 } else {
725 h[i].privNF = ar5212GetNfHistMid(h[i].nfCalBuffer);
726 }
727 }
728 }
729
730 static uint16_t
ar5416GetDefaultNF(struct ath_hal * ah,const struct ieee80211_channel * chan)731 ar5416GetDefaultNF(struct ath_hal *ah, const struct ieee80211_channel *chan)
732 {
733 struct ar5416NfLimits *limit;
734
735 if (!chan || IEEE80211_IS_CHAN_2GHZ(chan))
736 limit = &AH5416(ah)->nf_2g;
737 else
738 limit = &AH5416(ah)->nf_5g;
739
740 return limit->nominal;
741 }
742
743 static void
ar5416SanitizeNF(struct ath_hal * ah,int16_t * nf)744 ar5416SanitizeNF(struct ath_hal *ah, int16_t *nf)
745 {
746
747 struct ar5416NfLimits *limit;
748 int i;
749
750 if (IEEE80211_IS_CHAN_2GHZ(AH_PRIVATE(ah)->ah_curchan))
751 limit = &AH5416(ah)->nf_2g;
752 else
753 limit = &AH5416(ah)->nf_5g;
754
755 for (i = 0; i < AR5416_NUM_NF_READINGS; i++) {
756 if (!nf[i])
757 continue;
758
759 if (nf[i] > limit->max) {
760 HALDEBUG(ah, HAL_DEBUG_NFCAL,
761 "NF[%d] (%d) > MAX (%d), correcting to MAX\n",
762 i, nf[i], limit->max);
763 nf[i] = limit->max;
764 } else if (nf[i] < limit->min) {
765 HALDEBUG(ah, HAL_DEBUG_NFCAL,
766 "NF[%d] (%d) < MIN (%d), correcting to NOM\n",
767 i, nf[i], limit->min);
768 nf[i] = limit->nominal;
769 }
770 }
771 }
772
773
774 /*
775 * Read the NF and check it against the noise floor threshold
776 *
777 * Return 0 if the NF calibration hadn't finished, 0 if it was
778 * invalid, or > 0 for a valid NF reading.
779 */
780 static int16_t
ar5416GetNf(struct ath_hal * ah,struct ieee80211_channel * chan)781 ar5416GetNf(struct ath_hal *ah, struct ieee80211_channel *chan)
782 {
783 int16_t nf, nfThresh;
784 int i;
785 int retval = 0;
786
787 if (ar5212IsNFCalInProgress(ah)) {
788 HALDEBUG(ah, HAL_DEBUG_ANY,
789 "%s: NF didn't complete in calibration window\n", __func__);
790 nf = 0;
791 retval = -1; /* NF didn't finish */
792 } else {
793 /* Finished NF cal, check against threshold */
794 int16_t nfarray[NUM_NOISEFLOOR_READINGS] = { 0 };
795 HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan);
796
797 /* TODO - enhance for multiple chains and ext ch */
798 ath_hal_getNoiseFloor(ah, nfarray);
799 nf = nfarray[0];
800 ar5416SanitizeNF(ah, nfarray);
801 if (ar5416GetEepromNoiseFloorThresh(ah, chan, &nfThresh)) {
802 if (nf > nfThresh) {
803 HALDEBUG(ah, HAL_DEBUG_UNMASKABLE,
804 "%s: noise floor failed detected; "
805 "detected %d, threshold %d\n", __func__,
806 nf, nfThresh);
807 /*
808 * NB: Don't discriminate 2.4 vs 5Ghz, if this
809 * happens it indicates a problem regardless
810 * of the band.
811 */
812 chan->ic_state |= IEEE80211_CHANSTATE_CWINT;
813 nf = 0;
814 retval = 0;
815 }
816 } else {
817 nf = 0;
818 retval = 0;
819 }
820 /* Update MIMO channel statistics, regardless of validity or not (for now) */
821 for (i = 0; i < 3; i++) {
822 ichan->noiseFloorCtl[i] = nfarray[i];
823 ichan->noiseFloorExt[i] = nfarray[i + 3];
824 }
825 ichan->privFlags |= CHANNEL_MIMO_NF_VALID;
826
827 ar5416UpdateNFHistBuff(ah, AH5416(ah)->ah_cal.nfCalHist, nfarray);
828 ichan->rawNoiseFloor = nf;
829 retval = nf;
830 }
831 return retval;
832 }
833