2 * Copyright (c) 2008-2011 Atheros Communications Inc.
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 #include <linux/export.h>
21 /* Common calibration code */
24 static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer
)
27 int16_t sort
[ATH9K_NF_CAL_HIST_MAX
];
30 for (i
= 0; i
< ATH9K_NF_CAL_HIST_MAX
; i
++)
31 sort
[i
] = nfCalBuffer
[i
];
33 for (i
= 0; i
< ATH9K_NF_CAL_HIST_MAX
- 1; i
++) {
34 for (j
= 1; j
< ATH9K_NF_CAL_HIST_MAX
- i
; j
++) {
35 if (sort
[j
] > sort
[j
- 1]) {
37 sort
[j
] = sort
[j
- 1];
42 nfval
= sort
[(ATH9K_NF_CAL_HIST_MAX
- 1) >> 1];
47 static struct ath_nf_limits
*ath9k_hw_get_nf_limits(struct ath_hw
*ah
,
48 struct ath9k_channel
*chan
)
50 struct ath_nf_limits
*limit
;
52 if (!chan
|| IS_CHAN_2GHZ(chan
))
60 static s16
ath9k_hw_get_default_nf(struct ath_hw
*ah
,
61 struct ath9k_channel
*chan
)
63 return ath9k_hw_get_nf_limits(ah
, chan
)->nominal
;
66 s16
ath9k_hw_getchan_noise(struct ath_hw
*ah
, struct ath9k_channel
*chan
,
69 s8 noise
= ATH_DEFAULT_NOISE_FLOOR
;
72 s8 delta
= nf
- ATH9K_NF_CAL_NOISE_THRESH
-
73 ath9k_hw_get_default_nf(ah
, chan
);
79 EXPORT_SYMBOL(ath9k_hw_getchan_noise
);
81 static void ath9k_hw_update_nfcal_hist_buffer(struct ath_hw
*ah
,
82 struct ath9k_hw_cal_data
*cal
,
85 struct ath_common
*common
= ath9k_hw_common(ah
);
86 struct ath_nf_limits
*limit
;
87 struct ath9k_nfcal_hist
*h
;
88 bool high_nf_mid
= false;
89 u8 chainmask
= (ah
->rxchainmask
<< 3) | ah
->rxchainmask
;
93 limit
= ath9k_hw_get_nf_limits(ah
, ah
->curchan
);
95 for (i
= 0; i
< NUM_NF_READINGS
; i
++) {
96 if (!(chainmask
& (1 << i
)) ||
97 ((i
>= AR5416_MAX_CHAINS
) && !IS_CHAN_HT40(ah
->curchan
)))
100 h
[i
].nfCalBuffer
[h
[i
].currIndex
] = nfarray
[i
];
102 if (++h
[i
].currIndex
>= ATH9K_NF_CAL_HIST_MAX
)
105 if (h
[i
].invalidNFcount
> 0) {
106 h
[i
].invalidNFcount
--;
107 h
[i
].privNF
= nfarray
[i
];
110 ath9k_hw_get_nf_hist_mid(h
[i
].nfCalBuffer
);
116 if (h
[i
].privNF
> limit
->max
) {
119 ath_dbg(common
, CALIBRATE
,
120 "NFmid[%d] (%d) > MAX (%d), %s\n",
121 i
, h
[i
].privNF
, limit
->max
,
122 (test_bit(NFCAL_INTF
, &cal
->cal_flags
) ?
123 "not corrected (due to interference)" :
124 "correcting to MAX"));
127 * Normally we limit the average noise floor by the
128 * hardware specific maximum here. However if we have
129 * encountered stuck beacons because of interference,
130 * we bypass this limit here in order to better deal
131 * with our environment.
133 if (!test_bit(NFCAL_INTF
, &cal
->cal_flags
))
134 h
[i
].privNF
= limit
->max
;
139 * If the noise floor seems normal for all chains, assume that
140 * there is no significant interference in the environment anymore.
141 * Re-enable the enforcement of the NF maximum again.
144 clear_bit(NFCAL_INTF
, &cal
->cal_flags
);
147 static bool ath9k_hw_get_nf_thresh(struct ath_hw
*ah
,
148 enum nl80211_band band
,
152 case NL80211_BAND_5GHZ
:
153 *nft
= (int8_t)ah
->eep_ops
->get_eeprom(ah
, EEP_NFTHRESH_5
);
155 case NL80211_BAND_2GHZ
:
156 *nft
= (int8_t)ah
->eep_ops
->get_eeprom(ah
, EEP_NFTHRESH_2
);
166 void ath9k_hw_reset_calibration(struct ath_hw
*ah
,
167 struct ath9k_cal_list
*currCal
)
171 ath9k_hw_setup_calibration(ah
, currCal
);
173 currCal
->calState
= CAL_RUNNING
;
175 for (i
= 0; i
< AR5416_MAX_CHAINS
; i
++) {
176 ah
->meas0
.sign
[i
] = 0;
177 ah
->meas1
.sign
[i
] = 0;
178 ah
->meas2
.sign
[i
] = 0;
179 ah
->meas3
.sign
[i
] = 0;
185 /* This is done for the currently configured channel */
186 bool ath9k_hw_reset_calvalid(struct ath_hw
*ah
)
188 struct ath_common
*common
= ath9k_hw_common(ah
);
189 struct ath9k_cal_list
*currCal
= ah
->cal_list_curr
;
194 if (!AR_SREV_9100(ah
) && !AR_SREV_9160_10_OR_LATER(ah
))
200 if (currCal
->calState
!= CAL_DONE
) {
201 ath_dbg(common
, CALIBRATE
, "Calibration state incorrect, %d\n",
206 if (!(ah
->supp_cals
& currCal
->calData
->calType
))
209 ath_dbg(common
, CALIBRATE
, "Resetting Cal %d state for channel %u\n",
210 currCal
->calData
->calType
, ah
->curchan
->chan
->center_freq
);
212 ah
->caldata
->CalValid
&= ~currCal
->calData
->calType
;
213 currCal
->calState
= CAL_WAITING
;
217 EXPORT_SYMBOL(ath9k_hw_reset_calvalid
);
219 void ath9k_hw_start_nfcal(struct ath_hw
*ah
, bool update
)
222 set_bit(NFCAL_PENDING
, &ah
->caldata
->cal_flags
);
224 REG_SET_BIT(ah
, AR_PHY_AGC_CONTROL
,
225 AR_PHY_AGC_CONTROL_ENABLE_NF
);
228 REG_CLR_BIT(ah
, AR_PHY_AGC_CONTROL
,
229 AR_PHY_AGC_CONTROL_NO_UPDATE_NF
);
231 REG_SET_BIT(ah
, AR_PHY_AGC_CONTROL
,
232 AR_PHY_AGC_CONTROL_NO_UPDATE_NF
);
234 REG_SET_BIT(ah
, AR_PHY_AGC_CONTROL
, AR_PHY_AGC_CONTROL_NF
);
237 int ath9k_hw_loadnf(struct ath_hw
*ah
, struct ath9k_channel
*chan
)
239 struct ath9k_nfcal_hist
*h
= NULL
;
241 u8 chainmask
= (ah
->rxchainmask
<< 3) | ah
->rxchainmask
;
242 struct ath_common
*common
= ath9k_hw_common(ah
);
243 s16 default_nf
= ath9k_hw_get_default_nf(ah
, chan
);
244 u32 bb_agc_ctl
= REG_READ(ah
, AR_PHY_AGC_CONTROL
);
247 h
= ah
->caldata
->nfCalHist
;
249 ENABLE_REG_RMW_BUFFER(ah
);
250 for (i
= 0; i
< NUM_NF_READINGS
; i
++) {
251 if (chainmask
& (1 << i
)) {
254 if ((i
>= AR5416_MAX_CHAINS
) && !IS_CHAN_HT40(chan
))
262 REG_RMW(ah
, ah
->nf_regs
[i
],
263 (((u32
) nfval
<< 1) & 0x1ff), 0x1ff);
268 * stop NF cal if ongoing to ensure NF load completes immediately
269 * (or after end rx/tx frame if ongoing)
271 if (bb_agc_ctl
& AR_PHY_AGC_CONTROL_NF
) {
272 REG_CLR_BIT(ah
, AR_PHY_AGC_CONTROL
, AR_PHY_AGC_CONTROL_NF
);
273 REG_RMW_BUFFER_FLUSH(ah
);
274 ENABLE_REG_RMW_BUFFER(ah
);
278 * Load software filtered NF value into baseband internal minCCApwr
281 REG_CLR_BIT(ah
, AR_PHY_AGC_CONTROL
,
282 AR_PHY_AGC_CONTROL_ENABLE_NF
);
283 REG_CLR_BIT(ah
, AR_PHY_AGC_CONTROL
,
284 AR_PHY_AGC_CONTROL_NO_UPDATE_NF
);
285 REG_SET_BIT(ah
, AR_PHY_AGC_CONTROL
, AR_PHY_AGC_CONTROL_NF
);
286 REG_RMW_BUFFER_FLUSH(ah
);
289 * Wait for load to complete, should be fast, a few 10s of us.
290 * The max delay was changed from an original 250us to 22.2 msec.
291 * This would increase timeout to the longest possible frame
292 * (11n max length 22.1 msec)
294 for (j
= 0; j
< 22200; j
++) {
295 if ((REG_READ(ah
, AR_PHY_AGC_CONTROL
) &
296 AR_PHY_AGC_CONTROL_NF
) == 0)
302 * Restart NF so it can continue.
304 if (bb_agc_ctl
& AR_PHY_AGC_CONTROL_NF
) {
305 ENABLE_REG_RMW_BUFFER(ah
);
306 if (bb_agc_ctl
& AR_PHY_AGC_CONTROL_ENABLE_NF
)
307 REG_SET_BIT(ah
, AR_PHY_AGC_CONTROL
,
308 AR_PHY_AGC_CONTROL_ENABLE_NF
);
309 if (bb_agc_ctl
& AR_PHY_AGC_CONTROL_NO_UPDATE_NF
)
310 REG_SET_BIT(ah
, AR_PHY_AGC_CONTROL
,
311 AR_PHY_AGC_CONTROL_NO_UPDATE_NF
);
312 REG_SET_BIT(ah
, AR_PHY_AGC_CONTROL
, AR_PHY_AGC_CONTROL_NF
);
313 REG_RMW_BUFFER_FLUSH(ah
);
317 * We timed out waiting for the noisefloor to load, probably due to an
318 * in-progress rx. Simply return here and allow the load plenty of time
319 * to complete before the next calibration interval. We need to avoid
320 * trying to load -50 (which happens below) while the previous load is
321 * still in progress as this can cause rx deafness. Instead by returning
322 * here, the baseband nf cal will just be capped by our present
323 * noisefloor until the next calibration timer.
327 "Timeout while waiting for nf to load: AR_PHY_AGC_CONTROL=0x%x\n",
328 REG_READ(ah
, AR_PHY_AGC_CONTROL
));
333 * Restore maxCCAPower register parameter again so that we're not capped
334 * by the median we just loaded. This will be initial (and max) value
335 * of next noise floor calibration the baseband does.
337 ENABLE_REG_RMW_BUFFER(ah
);
338 for (i
= 0; i
< NUM_NF_READINGS
; i
++) {
339 if (chainmask
& (1 << i
)) {
340 if ((i
>= AR5416_MAX_CHAINS
) && !IS_CHAN_HT40(chan
))
343 REG_RMW(ah
, ah
->nf_regs
[i
],
344 (((u32
) (-50) << 1) & 0x1ff), 0x1ff);
347 REG_RMW_BUFFER_FLUSH(ah
);
353 static void ath9k_hw_nf_sanitize(struct ath_hw
*ah
, s16
*nf
)
355 struct ath_common
*common
= ath9k_hw_common(ah
);
356 struct ath_nf_limits
*limit
;
359 if (IS_CHAN_2GHZ(ah
->curchan
))
364 for (i
= 0; i
< NUM_NF_READINGS
; i
++) {
368 ath_dbg(common
, CALIBRATE
,
369 "NF calibrated [%s] [chain %d] is %d\n",
370 (i
>= 3 ? "ext" : "ctl"), i
% 3, nf
[i
]);
372 if (nf
[i
] > limit
->max
) {
373 ath_dbg(common
, CALIBRATE
,
374 "NF[%d] (%d) > MAX (%d), correcting to MAX\n",
375 i
, nf
[i
], limit
->max
);
377 } else if (nf
[i
] < limit
->min
) {
378 ath_dbg(common
, CALIBRATE
,
379 "NF[%d] (%d) < MIN (%d), correcting to NOM\n",
380 i
, nf
[i
], limit
->min
);
381 nf
[i
] = limit
->nominal
;
386 bool ath9k_hw_getnf(struct ath_hw
*ah
, struct ath9k_channel
*chan
)
388 struct ath_common
*common
= ath9k_hw_common(ah
);
389 int16_t nf
, nfThresh
;
390 int16_t nfarray
[NUM_NF_READINGS
] = { 0 };
391 struct ath9k_nfcal_hist
*h
;
392 struct ieee80211_channel
*c
= chan
->chan
;
393 struct ath9k_hw_cal_data
*caldata
= ah
->caldata
;
395 if (REG_READ(ah
, AR_PHY_AGC_CONTROL
) & AR_PHY_AGC_CONTROL_NF
) {
396 ath_dbg(common
, CALIBRATE
,
397 "NF did not complete in calibration window\n");
401 ath9k_hw_do_getnf(ah
, nfarray
);
402 ath9k_hw_nf_sanitize(ah
, nfarray
);
404 if (ath9k_hw_get_nf_thresh(ah
, c
->band
, &nfThresh
)
406 ath_dbg(common
, CALIBRATE
,
407 "noise floor failed detected; detected %d, threshold %d\n",
412 chan
->noisefloor
= nf
;
416 h
= caldata
->nfCalHist
;
417 clear_bit(NFCAL_PENDING
, &caldata
->cal_flags
);
418 ath9k_hw_update_nfcal_hist_buffer(ah
, caldata
, nfarray
);
419 chan
->noisefloor
= h
[0].privNF
;
420 ah
->noise
= ath9k_hw_getchan_noise(ah
, chan
, chan
->noisefloor
);
423 EXPORT_SYMBOL(ath9k_hw_getnf
);
425 void ath9k_init_nfcal_hist_buffer(struct ath_hw
*ah
,
426 struct ath9k_channel
*chan
)
428 struct ath9k_nfcal_hist
*h
;
432 ah
->caldata
->channel
= chan
->channel
;
433 ah
->caldata
->channelFlags
= chan
->channelFlags
;
434 h
= ah
->caldata
->nfCalHist
;
435 default_nf
= ath9k_hw_get_default_nf(ah
, chan
);
436 for (i
= 0; i
< NUM_NF_READINGS
; i
++) {
438 h
[i
].privNF
= default_nf
;
439 h
[i
].invalidNFcount
= AR_PHY_CCA_FILTERWINDOW_LENGTH
;
440 for (j
= 0; j
< ATH9K_NF_CAL_HIST_MAX
; j
++) {
441 h
[i
].nfCalBuffer
[j
] = default_nf
;
447 void ath9k_hw_bstuck_nfcal(struct ath_hw
*ah
)
449 struct ath9k_hw_cal_data
*caldata
= ah
->caldata
;
451 if (unlikely(!caldata
))
455 * If beacons are stuck, the most likely cause is interference.
456 * Triggering a noise floor calibration at this point helps the
457 * hardware adapt to a noisy environment much faster.
458 * To ensure that we recover from stuck beacons quickly, let
459 * the baseband update the internal NF value itself, similar to
460 * what is being done after a full reset.
462 if (!test_bit(NFCAL_PENDING
, &caldata
->cal_flags
))
463 ath9k_hw_start_nfcal(ah
, true);
464 else if (!(REG_READ(ah
, AR_PHY_AGC_CONTROL
) & AR_PHY_AGC_CONTROL_NF
))
465 ath9k_hw_getnf(ah
, ah
->curchan
);
467 set_bit(NFCAL_INTF
, &caldata
->cal_flags
);
469 EXPORT_SYMBOL(ath9k_hw_bstuck_nfcal
);