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 */
23 #define ATH9K_NF_TOO_HIGH -60
25 static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer
)
28 int16_t sort
[ATH9K_NF_CAL_HIST_MAX
];
31 for (i
= 0; i
< ATH9K_NF_CAL_HIST_MAX
; i
++)
32 sort
[i
] = nfCalBuffer
[i
];
34 for (i
= 0; i
< ATH9K_NF_CAL_HIST_MAX
- 1; i
++) {
35 for (j
= 1; j
< ATH9K_NF_CAL_HIST_MAX
- i
; j
++) {
36 if (sort
[j
] > sort
[j
- 1]) {
38 sort
[j
] = sort
[j
- 1];
43 nfval
= sort
[(ATH9K_NF_CAL_HIST_MAX
- 1) >> 1];
48 static struct ath_nf_limits
*ath9k_hw_get_nf_limits(struct ath_hw
*ah
,
49 struct ath9k_channel
*chan
)
51 struct ath_nf_limits
*limit
;
53 if (!chan
|| IS_CHAN_2GHZ(chan
))
61 static s16
ath9k_hw_get_default_nf(struct ath_hw
*ah
,
62 struct ath9k_channel
*chan
)
64 return ath9k_hw_get_nf_limits(ah
, chan
)->nominal
;
67 s16
ath9k_hw_getchan_noise(struct ath_hw
*ah
, struct ath9k_channel
*chan
)
69 s8 noise
= ATH_DEFAULT_NOISE_FLOOR
;
71 if (chan
&& chan
->noisefloor
) {
72 s8 delta
= chan
->noisefloor
-
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
, ATH_DBG_CALIBRATE
,
120 "NFmid[%d] (%d) > MAX (%d), %s\n",
121 i
, h
[i
].privNF
, limit
->max
,
122 (cal
->nfcal_interference
?
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 (!cal
->nfcal_interference
)
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 cal
->nfcal_interference
= false;
147 static bool ath9k_hw_get_nf_thresh(struct ath_hw
*ah
,
148 enum ieee80211_band band
,
152 case IEEE80211_BAND_5GHZ
:
153 *nft
= (int8_t)ah
->eep_ops
->get_eeprom(ah
, EEP_NFTHRESH_5
);
155 case IEEE80211_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 ieee80211_conf
*conf
= &common
->hw
->conf
;
190 struct ath9k_cal_list
*currCal
= ah
->cal_list_curr
;
195 if (!AR_SREV_9100(ah
) && !AR_SREV_9160_10_OR_LATER(ah
))
201 if (currCal
->calState
!= CAL_DONE
) {
202 ath_dbg(common
, ATH_DBG_CALIBRATE
,
203 "Calibration state incorrect, %d\n",
208 if (!(ah
->supp_cals
& currCal
->calData
->calType
))
211 ath_dbg(common
, ATH_DBG_CALIBRATE
,
212 "Resetting Cal %d state for channel %u\n",
213 currCal
->calData
->calType
, conf
->channel
->center_freq
);
215 ah
->caldata
->CalValid
&= ~currCal
->calData
->calType
;
216 currCal
->calState
= CAL_WAITING
;
220 EXPORT_SYMBOL(ath9k_hw_reset_calvalid
);
222 void ath9k_hw_start_nfcal(struct ath_hw
*ah
, bool update
)
225 ah
->caldata
->nfcal_pending
= true;
227 REG_SET_BIT(ah
, AR_PHY_AGC_CONTROL
,
228 AR_PHY_AGC_CONTROL_ENABLE_NF
);
231 REG_CLR_BIT(ah
, AR_PHY_AGC_CONTROL
,
232 AR_PHY_AGC_CONTROL_NO_UPDATE_NF
);
234 REG_SET_BIT(ah
, AR_PHY_AGC_CONTROL
,
235 AR_PHY_AGC_CONTROL_NO_UPDATE_NF
);
237 REG_SET_BIT(ah
, AR_PHY_AGC_CONTROL
, AR_PHY_AGC_CONTROL_NF
);
240 void ath9k_hw_loadnf(struct ath_hw
*ah
, struct ath9k_channel
*chan
)
242 struct ath9k_nfcal_hist
*h
= NULL
;
245 u8 chainmask
= (ah
->rxchainmask
<< 3) | ah
->rxchainmask
;
246 struct ath_common
*common
= ath9k_hw_common(ah
);
247 struct ieee80211_conf
*conf
= &common
->hw
->conf
;
248 s16 default_nf
= ath9k_hw_get_default_nf(ah
, chan
);
251 h
= ah
->caldata
->nfCalHist
;
253 for (i
= 0; i
< NUM_NF_READINGS
; i
++) {
254 if (chainmask
& (1 << i
)) {
257 if ((i
>= AR5416_MAX_CHAINS
) && !conf_is_ht40(conf
))
265 val
= REG_READ(ah
, ah
->nf_regs
[i
]);
267 val
|= (((u32
) nfval
<< 1) & 0x1ff);
268 REG_WRITE(ah
, ah
->nf_regs
[i
], val
);
273 * Load software filtered NF value into baseband internal minCCApwr
276 REG_CLR_BIT(ah
, AR_PHY_AGC_CONTROL
,
277 AR_PHY_AGC_CONTROL_ENABLE_NF
);
278 REG_CLR_BIT(ah
, AR_PHY_AGC_CONTROL
,
279 AR_PHY_AGC_CONTROL_NO_UPDATE_NF
);
280 REG_SET_BIT(ah
, AR_PHY_AGC_CONTROL
, AR_PHY_AGC_CONTROL_NF
);
283 * Wait for load to complete, should be fast, a few 10s of us.
284 * The max delay was changed from an original 250us to 10000us
285 * since 250us often results in NF load timeout and causes deaf
286 * condition during stress testing 12/12/2009
288 for (j
= 0; j
< 10000; j
++) {
289 if ((REG_READ(ah
, AR_PHY_AGC_CONTROL
) &
290 AR_PHY_AGC_CONTROL_NF
) == 0)
296 * We timed out waiting for the noisefloor to load, probably due to an
297 * in-progress rx. Simply return here and allow the load plenty of time
298 * to complete before the next calibration interval. We need to avoid
299 * trying to load -50 (which happens below) while the previous load is
300 * still in progress as this can cause rx deafness. Instead by returning
301 * here, the baseband nf cal will just be capped by our present
302 * noisefloor until the next calibration timer.
305 ath_dbg(common
, ATH_DBG_ANY
,
306 "Timeout while waiting for nf to load: AR_PHY_AGC_CONTROL=0x%x\n",
307 REG_READ(ah
, AR_PHY_AGC_CONTROL
));
312 * Restore maxCCAPower register parameter again so that we're not capped
313 * by the median we just loaded. This will be initial (and max) value
314 * of next noise floor calibration the baseband does.
316 ENABLE_REGWRITE_BUFFER(ah
);
317 for (i
= 0; i
< NUM_NF_READINGS
; i
++) {
318 if (chainmask
& (1 << i
)) {
319 if ((i
>= AR5416_MAX_CHAINS
) && !conf_is_ht40(conf
))
322 val
= REG_READ(ah
, ah
->nf_regs
[i
]);
324 val
|= (((u32
) (-50) << 1) & 0x1ff);
325 REG_WRITE(ah
, ah
->nf_regs
[i
], val
);
328 REGWRITE_BUFFER_FLUSH(ah
);
332 static void ath9k_hw_nf_sanitize(struct ath_hw
*ah
, s16
*nf
)
334 struct ath_common
*common
= ath9k_hw_common(ah
);
335 struct ath_nf_limits
*limit
;
338 if (IS_CHAN_2GHZ(ah
->curchan
))
343 for (i
= 0; i
< NUM_NF_READINGS
; i
++) {
347 ath_dbg(common
, ATH_DBG_CALIBRATE
,
348 "NF calibrated [%s] [chain %d] is %d\n",
349 (i
>= 3 ? "ext" : "ctl"), i
% 3, nf
[i
]);
351 if (nf
[i
] > ATH9K_NF_TOO_HIGH
) {
352 ath_dbg(common
, ATH_DBG_CALIBRATE
,
353 "NF[%d] (%d) > MAX (%d), correcting to MAX\n",
354 i
, nf
[i
], ATH9K_NF_TOO_HIGH
);
356 } else if (nf
[i
] < limit
->min
) {
357 ath_dbg(common
, ATH_DBG_CALIBRATE
,
358 "NF[%d] (%d) < MIN (%d), correcting to NOM\n",
359 i
, nf
[i
], limit
->min
);
360 nf
[i
] = limit
->nominal
;
365 bool ath9k_hw_getnf(struct ath_hw
*ah
, struct ath9k_channel
*chan
)
367 struct ath_common
*common
= ath9k_hw_common(ah
);
368 int16_t nf
, nfThresh
;
369 int16_t nfarray
[NUM_NF_READINGS
] = { 0 };
370 struct ath9k_nfcal_hist
*h
;
371 struct ieee80211_channel
*c
= chan
->chan
;
372 struct ath9k_hw_cal_data
*caldata
= ah
->caldata
;
374 chan
->channelFlags
&= (~CHANNEL_CW_INT
);
375 if (REG_READ(ah
, AR_PHY_AGC_CONTROL
) & AR_PHY_AGC_CONTROL_NF
) {
376 ath_dbg(common
, ATH_DBG_CALIBRATE
,
377 "NF did not complete in calibration window\n");
381 ath9k_hw_do_getnf(ah
, nfarray
);
382 ath9k_hw_nf_sanitize(ah
, nfarray
);
384 if (ath9k_hw_get_nf_thresh(ah
, c
->band
, &nfThresh
)
386 ath_dbg(common
, ATH_DBG_CALIBRATE
,
387 "noise floor failed detected; detected %d, threshold %d\n",
389 chan
->channelFlags
|= CHANNEL_CW_INT
;
393 chan
->noisefloor
= nf
;
394 ah
->noise
= ath9k_hw_getchan_noise(ah
, chan
);
398 h
= caldata
->nfCalHist
;
399 caldata
->nfcal_pending
= false;
400 ath9k_hw_update_nfcal_hist_buffer(ah
, caldata
, nfarray
);
401 chan
->noisefloor
= h
[0].privNF
;
402 ah
->noise
= ath9k_hw_getchan_noise(ah
, chan
);
405 EXPORT_SYMBOL(ath9k_hw_getnf
);
407 void ath9k_init_nfcal_hist_buffer(struct ath_hw
*ah
,
408 struct ath9k_channel
*chan
)
410 struct ath9k_nfcal_hist
*h
;
414 ah
->caldata
->channel
= chan
->channel
;
415 ah
->caldata
->channelFlags
= chan
->channelFlags
& ~CHANNEL_CW_INT
;
416 h
= ah
->caldata
->nfCalHist
;
417 default_nf
= ath9k_hw_get_default_nf(ah
, chan
);
418 for (i
= 0; i
< NUM_NF_READINGS
; i
++) {
420 h
[i
].privNF
= default_nf
;
421 h
[i
].invalidNFcount
= AR_PHY_CCA_FILTERWINDOW_LENGTH
;
422 for (j
= 0; j
< ATH9K_NF_CAL_HIST_MAX
; j
++) {
423 h
[i
].nfCalBuffer
[j
] = default_nf
;
429 void ath9k_hw_bstuck_nfcal(struct ath_hw
*ah
)
431 struct ath9k_hw_cal_data
*caldata
= ah
->caldata
;
433 if (unlikely(!caldata
))
437 * If beacons are stuck, the most likely cause is interference.
438 * Triggering a noise floor calibration at this point helps the
439 * hardware adapt to a noisy environment much faster.
440 * To ensure that we recover from stuck beacons quickly, let
441 * the baseband update the internal NF value itself, similar to
442 * what is being done after a full reset.
444 if (!caldata
->nfcal_pending
)
445 ath9k_hw_start_nfcal(ah
, true);
446 else if (!(REG_READ(ah
, AR_PHY_AGC_CONTROL
) & AR_PHY_AGC_CONTROL_NF
))
447 ath9k_hw_getnf(ah
, ah
->curchan
);
449 caldata
->nfcal_interference
= true;
451 EXPORT_SYMBOL(ath9k_hw_bstuck_nfcal
);