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sys/dev/ath/ath_hal/ar5416/ar5416_cal.c
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1 /*- 2 * SPDX-License-Identifier: ISC 3 * 4 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 5 * Copyright (c) 2002-2008 Atheros Communications, Inc. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 * 19 * $FreeBSD$ 20 */ 21 #include "opt_ah.h" 22 23 #include "ah.h" 24 #include "ah_internal.h" 25 #include "ah_devid.h" 26 27 #include "ah_eeprom_v14.h" 28 29 #include "ar5212/ar5212.h" /* for NF cal related declarations */ 30 31 #include "ar5416/ar5416.h" 32 #include "ar5416/ar5416reg.h" 33 #include "ar5416/ar5416phy.h" 34 35 /* Owl specific stuff */ 36 #define NUM_NOISEFLOOR_READINGS 6 /* 3 chains * (ctl + ext) */ 37 38 static void ar5416StartNFCal(struct ath_hal *ah); 39 static HAL_BOOL ar5416LoadNF(struct ath_hal *ah, const struct ieee80211_channel *); 40 static int16_t ar5416GetNf(struct ath_hal *, struct ieee80211_channel *); 41 42 static uint16_t ar5416GetDefaultNF(struct ath_hal *ah, const struct ieee80211_channel *chan); 43 static void ar5416SanitizeNF(struct ath_hal *ah, int16_t *nf); 44 45 /* 46 * Determine if calibration is supported by device and channel flags 47 */ 48 49 /* 50 * ADC GAIN/DC offset calibration is for calibrating two ADCs that 51 * are acting as one by interleaving incoming symbols. This isn't 52 * relevant for 2.4GHz 20MHz wide modes because, as far as I can tell, 53 * the secondary ADC is never enabled. It is enabled however for 54 * 5GHz modes. 55 * 56 * It hasn't been confirmed whether doing this calibration is needed 57 * at all in the above modes and/or whether it's actually harmful. 58 * So for now, let's leave it enabled and just remember to get 59 * confirmation that it needs to be clarified. 60 * 61 * See US Patent No: US 7,541,952 B1: 62 * " Method and Apparatus for Offset and Gain Compensation for 63 * Analog-to-Digital Converters." 64 */ 65 static OS_INLINE HAL_BOOL 66 ar5416IsCalSupp(struct ath_hal *ah, const struct ieee80211_channel *chan, 67 HAL_CAL_TYPE calType) 68 { 69 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 70 71 switch (calType & cal->suppCals) { 72 case IQ_MISMATCH_CAL: 73 /* Run IQ Mismatch for non-CCK only */ 74 return !IEEE80211_IS_CHAN_B(chan); 75 case ADC_GAIN_CAL: 76 case ADC_DC_CAL: 77 /* 78 * Run ADC Gain Cal for either 5ghz any or 2ghz HT40. 79 * 80 * Don't run ADC calibrations for 5ghz fast clock mode 81 * in HT20 - only one ADC is used. 82 */ 83 if (IEEE80211_IS_CHAN_HT20(chan) && 84 (IS_5GHZ_FAST_CLOCK_EN(ah, chan))) 85 return AH_FALSE; 86 if (IEEE80211_IS_CHAN_5GHZ(chan)) 87 return AH_TRUE; 88 if (IEEE80211_IS_CHAN_HT40(chan)) 89 return AH_TRUE; 90 return AH_FALSE; 91 } 92 return AH_FALSE; 93 } 94 95 /* 96 * Setup HW to collect samples used for current cal 97 */ 98 static void 99 ar5416SetupMeasurement(struct ath_hal *ah, HAL_CAL_LIST *currCal) 100 { 101 /* Start calibration w/ 2^(INIT_IQCAL_LOG_COUNT_MAX+1) samples */ 102 OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4, 103 AR_PHY_TIMING_CTRL4_IQCAL_LOG_COUNT_MAX, 104 currCal->calData->calCountMax); 105 106 /* Select calibration to run */ 107 switch (currCal->calData->calType) { 108 case IQ_MISMATCH_CAL: 109 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_IQ); 110 HALDEBUG(ah, HAL_DEBUG_PERCAL, 111 "%s: start IQ Mismatch calibration\n", __func__); 112 break; 113 case ADC_GAIN_CAL: 114 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_GAIN); 115 HALDEBUG(ah, HAL_DEBUG_PERCAL, 116 "%s: start ADC Gain calibration\n", __func__); 117 break; 118 case ADC_DC_CAL: 119 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_DC_PER); 120 HALDEBUG(ah, HAL_DEBUG_PERCAL, 121 "%s: start ADC DC calibration\n", __func__); 122 break; 123 case ADC_DC_INIT_CAL: 124 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_DC_INIT); 125 HALDEBUG(ah, HAL_DEBUG_PERCAL, 126 "%s: start Init ADC DC calibration\n", __func__); 127 break; 128 } 129 /* Kick-off cal */ 130 OS_REG_SET_BIT(ah, AR_PHY_TIMING_CTRL4, AR_PHY_TIMING_CTRL4_DO_CAL); 131 } 132 133 /* 134 * Initialize shared data structures and prepare a cal to be run. 135 */ 136 static void 137 ar5416ResetMeasurement(struct ath_hal *ah, HAL_CAL_LIST *currCal) 138 { 139 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 140 141 /* Reset data structures shared between different calibrations */ 142 OS_MEMZERO(cal->caldata, sizeof(cal->caldata)); 143 cal->calSamples = 0; 144 145 /* Setup HW for new calibration */ 146 ar5416SetupMeasurement(ah, currCal); 147 148 /* Change SW state to RUNNING for this calibration */ 149 currCal->calState = CAL_RUNNING; 150 } 151 152 #if 0 153 /* 154 * Run non-periodic calibrations. 155 */ 156 static HAL_BOOL 157 ar5416RunInitCals(struct ath_hal *ah, int init_cal_count) 158 { 159 struct ath_hal_5416 *ahp = AH5416(ah); 160 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 161 HAL_CHANNEL_INTERNAL ichan; /* XXX bogus */ 162 HAL_CAL_LIST *curCal = ahp->ah_cal_curr; 163 HAL_BOOL isCalDone; 164 int i; 165 166 if (curCal == AH_NULL) 167 return AH_FALSE; 168 169 ichan.calValid = 0; 170 for (i = 0; i < init_cal_count; i++) { 171 /* Reset this Cal */ 172 ar5416ResetMeasurement(ah, curCal); 173 /* Poll for offset calibration complete */ 174 if (!ath_hal_wait(ah, AR_PHY_TIMING_CTRL4, AR_PHY_TIMING_CTRL4_DO_CAL, 0)) { 175 HALDEBUG(ah, HAL_DEBUG_ANY, 176 "%s: Cal %d failed to finish in 100ms.\n", 177 __func__, curCal->calData->calType); 178 /* Re-initialize list pointers for periodic cals */ 179 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL; 180 return AH_FALSE; 181 } 182 /* Run this cal */ 183 ar5416DoCalibration(ah, &ichan, ahp->ah_rxchainmask, 184 curCal, &isCalDone); 185 if (!isCalDone) 186 HALDEBUG(ah, HAL_DEBUG_ANY, 187 "%s: init cal %d did not complete.\n", 188 __func__, curCal->calData->calType); 189 if (curCal->calNext != AH_NULL) 190 curCal = curCal->calNext; 191 } 192 193 /* Re-initialize list pointers for periodic cals */ 194 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL; 195 return AH_TRUE; 196 } 197 #endif 198 199 /* 200 * AGC calibration for the AR5416, AR9130, AR9160, AR9280. 201 */ 202 HAL_BOOL 203 ar5416InitCalHardware(struct ath_hal *ah, const struct ieee80211_channel *chan) 204 { 205 206 if (AR_SREV_MERLIN_10_OR_LATER(ah)) { 207 /* Disable ADC */ 208 OS_REG_CLR_BIT(ah, AR_PHY_ADC_CTL, 209 AR_PHY_ADC_CTL_OFF_PWDADC); 210 211 /* Enable Rx Filter Cal */ 212 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, 213 AR_PHY_AGC_CONTROL_FLTR_CAL); 214 } 215 216 /* Calibrate the AGC */ 217 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL); 218 219 /* Poll for offset calibration complete */ 220 if (!ath_hal_wait(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL, 0)) { 221 HALDEBUG(ah, HAL_DEBUG_ANY, 222 "%s: offset calibration did not complete in 1ms; " 223 "noisy environment?\n", __func__); 224 return AH_FALSE; 225 } 226 227 if (AR_SREV_MERLIN_10_OR_LATER(ah)) { 228 /* Enable ADC */ 229 OS_REG_SET_BIT(ah, AR_PHY_ADC_CTL, 230 AR_PHY_ADC_CTL_OFF_PWDADC); 231 232 /* Disable Rx Filter Cal */ 233 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, 234 AR_PHY_AGC_CONTROL_FLTR_CAL); 235 } 236 237 return AH_TRUE; 238 } 239 240 /* 241 * Initialize Calibration infrastructure. 242 */ 243 #define MAX_CAL_CHECK 32 244 HAL_BOOL 245 ar5416InitCal(struct ath_hal *ah, const struct ieee80211_channel *chan) 246 { 247 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 248 HAL_CHANNEL_INTERNAL *ichan; 249 250 ichan = ath_hal_checkchannel(ah, chan); 251 HALASSERT(ichan != AH_NULL); 252 253 /* Do initial chipset-specific calibration */ 254 if (! AH5416(ah)->ah_cal_initcal(ah, chan)) { 255 HALDEBUG(ah, HAL_DEBUG_ANY, 256 "%s: initial chipset calibration did " 257 "not complete in time; noisy environment?\n", __func__); 258 return AH_FALSE; 259 } 260 261 /* If there's PA Cal, do it */ 262 if (AH5416(ah)->ah_cal_pacal) 263 AH5416(ah)->ah_cal_pacal(ah, AH_TRUE); 264 265 /* 266 * Do NF calibration after DC offset and other CALs. 267 * Per system engineers, noise floor value can sometimes be 20 dB 268 * higher than normal value if DC offset and noise floor cal are 269 * triggered at the same time. 270 */ 271 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 272 273 /* 274 * This may take a while to run; make sure subsequent 275 * calibration routines check that this has completed 276 * before reading the value and triggering a subsequent 277 * calibration. 278 */ 279 280 /* Initialize list pointers */ 281 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL; 282 283 /* 284 * Enable IQ, ADC Gain, ADC DC Offset Cals 285 */ 286 if (AR_SREV_HOWL(ah) || AR_SREV_SOWL_10_OR_LATER(ah)) { 287 /* Setup all non-periodic, init time only calibrations */ 288 /* XXX: Init DC Offset not working yet */ 289 #if 0 290 if (ar5416IsCalSupp(ah, chan, ADC_DC_INIT_CAL)) { 291 INIT_CAL(&cal->adcDcCalInitData); 292 INSERT_CAL(cal, &cal->adcDcCalInitData); 293 } 294 /* Initialize current pointer to first element in list */ 295 cal->cal_curr = cal->cal_list; 296 297 if (cal->ah_cal_curr != AH_NULL && !ar5416RunInitCals(ah, 0)) 298 return AH_FALSE; 299 #endif 300 } 301 302 /* If Cals are supported, add them to list via INIT/INSERT_CAL */ 303 if (ar5416IsCalSupp(ah, chan, ADC_GAIN_CAL)) { 304 INIT_CAL(&cal->adcGainCalData); 305 INSERT_CAL(cal, &cal->adcGainCalData); 306 HALDEBUG(ah, HAL_DEBUG_PERCAL, 307 "%s: enable ADC Gain Calibration.\n", __func__); 308 } 309 if (ar5416IsCalSupp(ah, chan, ADC_DC_CAL)) { 310 INIT_CAL(&cal->adcDcCalData); 311 INSERT_CAL(cal, &cal->adcDcCalData); 312 HALDEBUG(ah, HAL_DEBUG_PERCAL, 313 "%s: enable ADC DC Calibration.\n", __func__); 314 } 315 if (ar5416IsCalSupp(ah, chan, IQ_MISMATCH_CAL)) { 316 INIT_CAL(&cal->iqCalData); 317 INSERT_CAL(cal, &cal->iqCalData); 318 HALDEBUG(ah, HAL_DEBUG_PERCAL, 319 "%s: enable IQ Calibration.\n", __func__); 320 } 321 /* Initialize current pointer to first element in list */ 322 cal->cal_curr = cal->cal_list; 323 324 /* Kick off measurements for the first cal */ 325 if (cal->cal_curr != AH_NULL) 326 ar5416ResetMeasurement(ah, cal->cal_curr); 327 328 /* Mark all calibrations on this channel as being invalid */ 329 ichan->calValid = 0; 330 331 return AH_TRUE; 332 #undef MAX_CAL_CHECK 333 } 334 335 /* 336 * Entry point for upper layers to restart current cal. 337 * Reset the calibration valid bit in channel. 338 */ 339 HAL_BOOL 340 ar5416ResetCalValid(struct ath_hal *ah, const struct ieee80211_channel *chan) 341 { 342 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 343 HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan); 344 HAL_CAL_LIST *currCal = cal->cal_curr; 345 346 if (!AR_SREV_SOWL_10_OR_LATER(ah)) 347 return AH_FALSE; 348 if (currCal == AH_NULL) 349 return AH_FALSE; 350 if (ichan == AH_NULL) { 351 HALDEBUG(ah, HAL_DEBUG_ANY, 352 "%s: invalid channel %u/0x%x; no mapping\n", 353 __func__, chan->ic_freq, chan->ic_flags); 354 return AH_FALSE; 355 } 356 /* 357 * Expected that this calibration has run before, post-reset. 358 * Current state should be done 359 */ 360 if (currCal->calState != CAL_DONE) { 361 HALDEBUG(ah, HAL_DEBUG_ANY, 362 "%s: Calibration state incorrect, %d\n", 363 __func__, currCal->calState); 364 return AH_FALSE; 365 } 366 367 /* Verify Cal is supported on this channel */ 368 if (!ar5416IsCalSupp(ah, chan, currCal->calData->calType)) 369 return AH_FALSE; 370 371 HALDEBUG(ah, HAL_DEBUG_PERCAL, 372 "%s: Resetting Cal %d state for channel %u/0x%x\n", 373 __func__, currCal->calData->calType, chan->ic_freq, 374 chan->ic_flags); 375 376 /* Disable cal validity in channel */ 377 ichan->calValid &= ~currCal->calData->calType; 378 currCal->calState = CAL_WAITING; 379 380 return AH_TRUE; 381 } 382 383 /* 384 * Recalibrate the lower PHY chips to account for temperature/environment 385 * changes. 386 */ 387 static void 388 ar5416DoCalibration(struct ath_hal *ah, HAL_CHANNEL_INTERNAL *ichan, 389 uint8_t rxchainmask, HAL_CAL_LIST *currCal, HAL_BOOL *isCalDone) 390 { 391 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 392 393 /* Cal is assumed not done until explicitly set below */ 394 *isCalDone = AH_FALSE; 395 396 HALDEBUG(ah, HAL_DEBUG_PERCAL, 397 "%s: %s Calibration, state %d, calValid 0x%x\n", 398 __func__, currCal->calData->calName, currCal->calState, 399 ichan->calValid); 400 401 /* Calibration in progress. */ 402 if (currCal->calState == CAL_RUNNING) { 403 /* Check to see if it has finished. */ 404 if (!(OS_REG_READ(ah, AR_PHY_TIMING_CTRL4) & AR_PHY_TIMING_CTRL4_DO_CAL)) { 405 HALDEBUG(ah, HAL_DEBUG_PERCAL, 406 "%s: sample %d of %d finished\n", 407 __func__, cal->calSamples, 408 currCal->calData->calNumSamples); 409 /* 410 * Collect measurements for active chains. 411 */ 412 currCal->calData->calCollect(ah); 413 if (++cal->calSamples >= currCal->calData->calNumSamples) { 414 int i, numChains = 0; 415 for (i = 0; i < AR5416_MAX_CHAINS; i++) { 416 if (rxchainmask & (1 << i)) 417 numChains++; 418 } 419 /* 420 * Process accumulated data 421 */ 422 currCal->calData->calPostProc(ah, numChains); 423 424 /* Calibration has finished. */ 425 ichan->calValid |= currCal->calData->calType; 426 currCal->calState = CAL_DONE; 427 *isCalDone = AH_TRUE; 428 } else { 429 /* 430 * Set-up to collect of another sub-sample. 431 */ 432 ar5416SetupMeasurement(ah, currCal); 433 } 434 } 435 } else if (!(ichan->calValid & currCal->calData->calType)) { 436 /* If current cal is marked invalid in channel, kick it off */ 437 ar5416ResetMeasurement(ah, currCal); 438 } 439 } 440 441 /* 442 * Internal interface to schedule periodic calibration work. 443 */ 444 HAL_BOOL 445 ar5416PerCalibrationN(struct ath_hal *ah, struct ieee80211_channel *chan, 446 u_int rxchainmask, HAL_BOOL longcal, HAL_BOOL *isCalDone) 447 { 448 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 449 HAL_CAL_LIST *currCal = cal->cal_curr; 450 HAL_CHANNEL_INTERNAL *ichan; 451 int r; 452 453 OS_MARK(ah, AH_MARK_PERCAL, chan->ic_freq); 454 455 *isCalDone = AH_TRUE; 456 457 /* 458 * Since ath_hal calls the PerCal method with rxchainmask=0x1; 459 * override it with the current chainmask. The upper levels currently 460 * doesn't know about the chainmask. 461 */ 462 rxchainmask = AH5416(ah)->ah_rx_chainmask; 463 464 /* Invalid channel check */ 465 ichan = ath_hal_checkchannel(ah, chan); 466 if (ichan == AH_NULL) { 467 HALDEBUG(ah, HAL_DEBUG_ANY, 468 "%s: invalid channel %u/0x%x; no mapping\n", 469 __func__, chan->ic_freq, chan->ic_flags); 470 return AH_FALSE; 471 } 472 473 /* 474 * For given calibration: 475 * 1. Call generic cal routine 476 * 2. When this cal is done (isCalDone) if we have more cals waiting 477 * (eg after reset), mask this to upper layers by not propagating 478 * isCalDone if it is set to TRUE. 479 * Instead, change isCalDone to FALSE and setup the waiting cal(s) 480 * to be run. 481 */ 482 if (currCal != AH_NULL && 483 (currCal->calState == CAL_RUNNING || 484 currCal->calState == CAL_WAITING)) { 485 ar5416DoCalibration(ah, ichan, rxchainmask, currCal, isCalDone); 486 if (*isCalDone == AH_TRUE) { 487 cal->cal_curr = currCal = currCal->calNext; 488 if (currCal->calState == CAL_WAITING) { 489 *isCalDone = AH_FALSE; 490 ar5416ResetMeasurement(ah, currCal); 491 } 492 } 493 } 494 495 /* Do NF cal only at longer intervals */ 496 if (longcal) { 497 /* Do PA calibration if the chipset supports */ 498 if (AH5416(ah)->ah_cal_pacal) 499 AH5416(ah)->ah_cal_pacal(ah, AH_FALSE); 500 501 /* Do open-loop temperature compensation if the chipset needs it */ 502 if (ath_hal_eepromGetFlag(ah, AR_EEP_OL_PWRCTRL)) 503 AH5416(ah)->ah_olcTempCompensation(ah); 504 505 /* 506 * Get the value from the previous NF cal 507 * and update the history buffer. 508 */ 509 r = ar5416GetNf(ah, chan); 510 if (r == 0 || r == -1) { 511 /* NF calibration result isn't valid */ 512 HALDEBUG(ah, HAL_DEBUG_UNMASKABLE, "%s: NF calibration" 513 " didn't finish; delaying CCA\n", __func__); 514 } else { 515 int ret; 516 /* 517 * NF calibration result is valid. 518 * 519 * Load the NF from history buffer of the current channel. 520 * NF is slow time-variant, so it is OK to use a 521 * historical value. 522 */ 523 ret = ar5416LoadNF(ah, AH_PRIVATE(ah)->ah_curchan); 524 525 /* start NF calibration, without updating BB NF register*/ 526 ar5416StartNFCal(ah); 527 528 /* 529 * If we failed calibration then tell the driver 530 * we failed and it should do a full chip reset 531 */ 532 if (! ret) 533 return AH_FALSE; 534 } 535 } 536 return AH_TRUE; 537 } 538 539 /* 540 * Recalibrate the lower PHY chips to account for temperature/environment 541 * changes. 542 */ 543 HAL_BOOL 544 ar5416PerCalibration(struct ath_hal *ah, struct ieee80211_channel *chan, 545 HAL_BOOL *isIQdone) 546 { 547 struct ath_hal_5416 *ahp = AH5416(ah); 548 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 549 HAL_CAL_LIST *curCal = cal->cal_curr; 550 551 if (curCal != AH_NULL && curCal->calData->calType == IQ_MISMATCH_CAL) { 552 return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask, 553 AH_TRUE, isIQdone); 554 } else { 555 HAL_BOOL isCalDone; 556 557 *isIQdone = AH_FALSE; 558 return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask, 559 AH_TRUE, &isCalDone); 560 } 561 } 562 563 static HAL_BOOL 564 ar5416GetEepromNoiseFloorThresh(struct ath_hal *ah, 565 const struct ieee80211_channel *chan, int16_t *nft) 566 { 567 if (IEEE80211_IS_CHAN_5GHZ(chan)) { 568 ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_5, nft); 569 return AH_TRUE; 570 } 571 if (IEEE80211_IS_CHAN_2GHZ(chan)) { 572 ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_2, nft); 573 return AH_TRUE; 574 } 575 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: invalid channel flags 0x%x\n", 576 __func__, chan->ic_flags); 577 return AH_FALSE; 578 } 579 580 static void 581 ar5416StartNFCal(struct ath_hal *ah) 582 { 583 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF); 584 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 585 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 586 } 587 588 static HAL_BOOL 589 ar5416LoadNF(struct ath_hal *ah, const struct ieee80211_channel *chan) 590 { 591 static const uint32_t ar5416_cca_regs[] = { 592 AR_PHY_CCA, 593 AR_PHY_CH1_CCA, 594 AR_PHY_CH2_CCA, 595 AR_PHY_EXT_CCA, 596 AR_PHY_CH1_EXT_CCA, 597 AR_PHY_CH2_EXT_CCA 598 }; 599 struct ar5212NfCalHist *h; 600 int i; 601 int32_t val; 602 uint8_t chainmask; 603 int16_t default_nf = ar5416GetDefaultNF(ah, chan); 604 605 /* 606 * Force NF calibration for all chains. 607 */ 608 if (AR_SREV_KITE(ah)) { 609 /* Kite has only one chain */ 610 chainmask = 0x9; 611 } else if (AR_SREV_MERLIN(ah) || AR_SREV_KIWI(ah)) { 612 /* Merlin/Kiwi has only two chains */ 613 chainmask = 0x1B; 614 } else { 615 chainmask = 0x3F; 616 } 617 618 /* 619 * Write filtered NF values into maxCCApwr register parameter 620 * so we can load below. 621 */ 622 h = AH5416(ah)->ah_cal.nfCalHist; 623 HALDEBUG(ah, HAL_DEBUG_NFCAL, "CCA: "); 624 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 625 /* Don't write to EXT radio CCA registers unless in HT/40 mode */ 626 /* XXX this check should really be cleaner! */ 627 if (i > 2 && !IEEE80211_IS_CHAN_HT40(chan)) 628 continue; 629 630 if (chainmask & (1 << i)) { 631 int16_t nf_val; 632 633 if (h) 634 nf_val = h[i].privNF; 635 else 636 nf_val = default_nf; 637 638 val = OS_REG_READ(ah, ar5416_cca_regs[i]); 639 val &= 0xFFFFFE00; 640 val |= (((uint32_t) nf_val << 1) & 0x1ff); 641 HALDEBUG(ah, HAL_DEBUG_NFCAL, "[%d: %d]", i, nf_val); 642 OS_REG_WRITE(ah, ar5416_cca_regs[i], val); 643 } 644 } 645 HALDEBUG(ah, HAL_DEBUG_NFCAL, "\n"); 646 647 /* Load software filtered NF value into baseband internal minCCApwr variable. */ 648 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF); 649 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 650 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 651 652 /* Wait for load to complete, should be fast, a few 10s of us. */ 653 if (! ar5212WaitNFCalComplete(ah, 1000)) { 654 /* 655 * We timed out waiting for the noisefloor to load, probably due to an 656 * in-progress rx. Simply return here and allow the load plenty of time 657 * to complete before the next calibration interval. We need to avoid 658 * trying to load -50 (which happens below) while the previous load is 659 * still in progress as this can cause rx deafness. Instead by returning 660 * here, the baseband nf cal will just be capped by our present 661 * noisefloor until the next calibration timer. 662 */ 663 HALDEBUG(ah, HAL_DEBUG_UNMASKABLE, "Timeout while waiting for " 664 "nf to load: AR_PHY_AGC_CONTROL=0x%x\n", 665 OS_REG_READ(ah, AR_PHY_AGC_CONTROL)); 666 return AH_FALSE; 667 } 668 669 /* 670 * Restore maxCCAPower register parameter again so that we're not capped 671 * by the median we just loaded. This will be initial (and max) value 672 * of next noise floor calibration the baseband does. 673 */ 674 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 675 /* Don't write to EXT radio CCA registers unless in HT/40 mode */ 676 /* XXX this check should really be cleaner! */ 677 if (i > 2 && !IEEE80211_IS_CHAN_HT40(chan)) 678 continue; 679 680 if (chainmask & (1 << i)) { 681 val = OS_REG_READ(ah, ar5416_cca_regs[i]); 682 val &= 0xFFFFFE00; 683 val |= (((uint32_t)(-50) << 1) & 0x1ff); 684 OS_REG_WRITE(ah, ar5416_cca_regs[i], val); 685 } 686 } 687 return AH_TRUE; 688 } 689 690 /* 691 * This just initialises the "good" values for AR5416 which 692 * may not be right; it'lll be overridden by ar5416SanitizeNF() 693 * to nominal values. 694 */ 695 void 696 ar5416InitNfHistBuff(struct ar5212NfCalHist *h) 697 { 698 int i, j; 699 700 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 701 h[i].currIndex = 0; 702 h[i].privNF = AR5416_CCA_MAX_GOOD_VALUE; 703 h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX; 704 for (j = 0; j < AR512_NF_CAL_HIST_MAX; j ++) 705 h[i].nfCalBuffer[j] = AR5416_CCA_MAX_GOOD_VALUE; 706 } 707 } 708 709 /* 710 * Update the noise floor buffer as a ring buffer 711 */ 712 static void 713 ar5416UpdateNFHistBuff(struct ath_hal *ah, struct ar5212NfCalHist *h, 714 int16_t *nfarray) 715 { 716 int i; 717 718 /* XXX TODO: don't record nfarray[] entries for inactive chains */ 719 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 720 h[i].nfCalBuffer[h[i].currIndex] = nfarray[i]; 721 722 if (++h[i].currIndex >= AR512_NF_CAL_HIST_MAX) 723 h[i].currIndex = 0; 724 if (h[i].invalidNFcount > 0) { 725 if (nfarray[i] < AR5416_CCA_MIN_BAD_VALUE || 726 nfarray[i] > AR5416_CCA_MAX_HIGH_VALUE) { 727 h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX; 728 } else { 729 h[i].invalidNFcount--; 730 h[i].privNF = nfarray[i]; 731 } 732 } else { 733 h[i].privNF = ar5212GetNfHistMid(h[i].nfCalBuffer); 734 } 735 } 736 } 737 738 static uint16_t 739 ar5416GetDefaultNF(struct ath_hal *ah, const struct ieee80211_channel *chan) 740 { 741 struct ar5416NfLimits *limit; 742 743 if (!chan || IEEE80211_IS_CHAN_2GHZ(chan)) 744 limit = &AH5416(ah)->nf_2g; 745 else 746 limit = &AH5416(ah)->nf_5g; 747 748 return limit->nominal; 749 } 750 751 static void 752 ar5416SanitizeNF(struct ath_hal *ah, int16_t *nf) 753 { 754 755 struct ar5416NfLimits *limit; 756 int i; 757 758 if (IEEE80211_IS_CHAN_2GHZ(AH_PRIVATE(ah)->ah_curchan)) 759 limit = &AH5416(ah)->nf_2g; 760 else 761 limit = &AH5416(ah)->nf_5g; 762 763 for (i = 0; i < AR5416_NUM_NF_READINGS; i++) { 764 if (!nf[i]) 765 continue; 766 767 if (nf[i] > limit->max) { 768 HALDEBUG(ah, HAL_DEBUG_NFCAL, 769 "NF[%d] (%d) > MAX (%d), correcting to MAX\n", 770 i, nf[i], limit->max); 771 nf[i] = limit->max; 772 } else if (nf[i] < limit->min) { 773 HALDEBUG(ah, HAL_DEBUG_NFCAL, 774 "NF[%d] (%d) < MIN (%d), correcting to NOM\n", 775 i, nf[i], limit->min); 776 nf[i] = limit->nominal; 777 } 778 } 779 } 780 781 /* 782 * Read the NF and check it against the noise floor threshold 783 * 784 * Return 0 if the NF calibration hadn't finished, 0 if it was 785 * invalid, or > 0 for a valid NF reading. 786 */ 787 static int16_t 788 ar5416GetNf(struct ath_hal *ah, struct ieee80211_channel *chan) 789 { 790 int16_t nf, nfThresh; 791 int i; 792 int retval = 0; 793 794 if (ar5212IsNFCalInProgress(ah)) { 795 HALDEBUG(ah, HAL_DEBUG_ANY, 796 "%s: NF didn't complete in calibration window\n", __func__); 797 nf = 0; 798 retval = -1; /* NF didn't finish */ 799 } else { 800 /* Finished NF cal, check against threshold */ 801 int16_t nfarray[NUM_NOISEFLOOR_READINGS] = { 0 }; 802 HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan); 803 804 /* TODO - enhance for multiple chains and ext ch */ 805 ath_hal_getNoiseFloor(ah, nfarray); 806 nf = nfarray[0]; 807 ar5416SanitizeNF(ah, nfarray); 808 if (ar5416GetEepromNoiseFloorThresh(ah, chan, &nfThresh)) { 809 if (nf > nfThresh) { 810 HALDEBUG(ah, HAL_DEBUG_UNMASKABLE, 811 "%s: noise floor failed detected; " 812 "detected %d, threshold %d\n", __func__, 813 nf, nfThresh); 814 /* 815 * NB: Don't discriminate 2.4 vs 5Ghz, if this 816 * happens it indicates a problem regardless 817 * of the band. 818 */ 819 chan->ic_state |= IEEE80211_CHANSTATE_CWINT; 820 nf = 0; 821 retval = 0; 822 } 823 } else { 824 nf = 0; 825 retval = 0; 826 } 827 /* Update MIMO channel statistics, regardless of validity or not (for now) */ 828 for (i = 0; i < 3; i++) { 829 ichan->noiseFloorCtl[i] = nfarray[i]; 830 ichan->noiseFloorExt[i] = nfarray[i + 3]; 831 } 832 ichan->privFlags |= CHANNEL_MIMO_NF_VALID; 833 834 ar5416UpdateNFHistBuff(ah, AH5416(ah)->ah_cal.nfCalHist, nfarray); 835 ichan->rawNoiseFloor = nf; 836 retval = nf; 837 } 838 return retval; 839 }
Cache object: 5e635123af3033dfa9201c07c4e1cd38
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