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#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 36static void ar5416StartNFCal(struct ath_hal *ah); 37static HAL_BOOL ar5416LoadNF(struct ath_hal *ah, const struct ieee80211_channel *); 38static int16_t ar5416GetNf(struct ath_hal *, struct ieee80211_channel *); 39 40static uint16_t ar5416GetDefaultNF(struct ath_hal *ah, const struct ieee80211_channel *chan); 41static 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 */ 63static OS_INLINE HAL_BOOL 64ar5416IsCalSupp(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 */ 96static void 97ar5416SetupMeasurement(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 */ 134static void 135ar5416ResetMeasurement(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 */ 154static HAL_BOOL 155ar5416RunInitCals(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 * AGC calibration for the AR5416, AR9130, AR9160, AR9280. 199 */ 200HAL_BOOL 201ar5416InitCalHardware(struct ath_hal *ah, const struct ieee80211_channel *chan) 202{ 203 204 if (AR_SREV_MERLIN_10_OR_LATER(ah)) { 205 /* Disable ADC */ 206 OS_REG_CLR_BIT(ah, AR_PHY_ADC_CTL, 207 AR_PHY_ADC_CTL_OFF_PWDADC); 208 209 /* Enable Rx Filter Cal */ 210 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, 211 AR_PHY_AGC_CONTROL_FLTR_CAL); 212 } 213 214 /* Calibrate the AGC */ 215 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL); 216 217 /* Poll for offset calibration complete */ 218 if (!ath_hal_wait(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL, 0)) { 219 HALDEBUG(ah, HAL_DEBUG_ANY, 220 "%s: offset calibration did not complete in 1ms; " 221 "noisy environment?\n", __func__); 222 return AH_FALSE; 223 } 224 225 if (AR_SREV_MERLIN_10_OR_LATER(ah)) { 226 /* Enable ADC */ 227 OS_REG_SET_BIT(ah, AR_PHY_ADC_CTL, 228 AR_PHY_ADC_CTL_OFF_PWDADC); 229 230 /* Disable Rx Filter Cal */ 231 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, 232 AR_PHY_AGC_CONTROL_FLTR_CAL); 233 } 234 235 return AH_TRUE; 236} 237 238/* 239 * Initialize Calibration infrastructure. 240 */ 241#define MAX_CAL_CHECK 32 242HAL_BOOL 243ar5416InitCal(struct ath_hal *ah, const struct ieee80211_channel *chan) 244{ 245 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 246 HAL_CHANNEL_INTERNAL *ichan; 247 248 ichan = ath_hal_checkchannel(ah, chan); 249 HALASSERT(ichan != AH_NULL); 250 251 /* Do initial chipset-specific calibration */ 252 if (! AH5416(ah)->ah_cal_initcal(ah, chan)) { 253 HALDEBUG(ah, HAL_DEBUG_ANY, 254 "%s: initial chipset calibration did " 255 "not complete in time; noisy environment?\n", __func__); 256 return AH_FALSE; 257 } 258 259 /* If there's PA Cal, do it */ 260 if (AH5416(ah)->ah_cal_pacal) 261 AH5416(ah)->ah_cal_pacal(ah, AH_TRUE); 262 263 /* 264 * Do NF calibration after DC offset and other CALs. 265 * Per system engineers, noise floor value can sometimes be 20 dB 266 * higher than normal value if DC offset and noise floor cal are 267 * triggered at the same time. 268 */ 269 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 270 271 /* 272 * This may take a while to run; make sure subsequent 273 * calibration routines check that this has completed 274 * before reading the value and triggering a subsequent 275 * calibration. 276 */ 277 278 /* Initialize list pointers */ 279 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL; 280 281 /* 282 * Enable IQ, ADC Gain, ADC DC Offset Cals 283 */ 284 if (AR_SREV_HOWL(ah) || AR_SREV_SOWL_10_OR_LATER(ah)) { 285 /* Setup all non-periodic, init time only calibrations */ 286 /* XXX: Init DC Offset not working yet */ 287#if 0 288 if (ar5416IsCalSupp(ah, chan, ADC_DC_INIT_CAL)) { 289 INIT_CAL(&cal->adcDcCalInitData); 290 INSERT_CAL(cal, &cal->adcDcCalInitData); 291 } 292 /* Initialize current pointer to first element in list */ 293 cal->cal_curr = cal->cal_list; 294 295 if (cal->ah_cal_curr != AH_NULL && !ar5416RunInitCals(ah, 0)) 296 return AH_FALSE; 297#endif 298 } 299 300 /* If Cals are supported, add them to list via INIT/INSERT_CAL */ 301 if (ar5416IsCalSupp(ah, chan, ADC_GAIN_CAL)) { 302 INIT_CAL(&cal->adcGainCalData); 303 INSERT_CAL(cal, &cal->adcGainCalData); 304 HALDEBUG(ah, HAL_DEBUG_PERCAL, 305 "%s: enable ADC Gain Calibration.\n", __func__); 306 } 307 if (ar5416IsCalSupp(ah, chan, ADC_DC_CAL)) { 308 INIT_CAL(&cal->adcDcCalData); 309 INSERT_CAL(cal, &cal->adcDcCalData); 310 HALDEBUG(ah, HAL_DEBUG_PERCAL, 311 "%s: enable ADC DC Calibration.\n", __func__); 312 } 313 if (ar5416IsCalSupp(ah, chan, IQ_MISMATCH_CAL)) { 314 INIT_CAL(&cal->iqCalData); 315 INSERT_CAL(cal, &cal->iqCalData); 316 HALDEBUG(ah, HAL_DEBUG_PERCAL, 317 "%s: enable IQ Calibration.\n", __func__); 318 } 319 /* Initialize current pointer to first element in list */ 320 cal->cal_curr = cal->cal_list; 321 322 /* Kick off measurements for the first cal */ 323 if (cal->cal_curr != AH_NULL) 324 ar5416ResetMeasurement(ah, cal->cal_curr); 325 326 /* Mark all calibrations on this channel as being invalid */ 327 ichan->calValid = 0; 328 329 return AH_TRUE; 330#undef MAX_CAL_CHECK 331} 332 333/* 334 * Entry point for upper layers to restart current cal. 335 * Reset the calibration valid bit in channel. 336 */ 337HAL_BOOL 338ar5416ResetCalValid(struct ath_hal *ah, const struct ieee80211_channel *chan) 339{ 340 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 341 HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan); 342 HAL_CAL_LIST *currCal = cal->cal_curr; 343 344 if (!AR_SREV_SOWL_10_OR_LATER(ah)) 345 return AH_FALSE; 346 if (currCal == AH_NULL) 347 return AH_FALSE; 348 if (ichan == AH_NULL) { 349 HALDEBUG(ah, HAL_DEBUG_ANY, 350 "%s: invalid channel %u/0x%x; no mapping\n", 351 __func__, chan->ic_freq, chan->ic_flags); 352 return AH_FALSE; 353 } 354 /* 355 * Expected that this calibration has run before, post-reset. 356 * Current state should be done 357 */ 358 if (currCal->calState != CAL_DONE) { 359 HALDEBUG(ah, HAL_DEBUG_ANY, 360 "%s: Calibration state incorrect, %d\n", 361 __func__, currCal->calState); 362 return AH_FALSE; 363 } 364 365 /* Verify Cal is supported on this channel */ 366 if (!ar5416IsCalSupp(ah, chan, currCal->calData->calType)) 367 return AH_FALSE; 368 369 HALDEBUG(ah, HAL_DEBUG_PERCAL, 370 "%s: Resetting Cal %d state for channel %u/0x%x\n", 371 __func__, currCal->calData->calType, chan->ic_freq, 372 chan->ic_flags); 373 374 /* Disable cal validity in channel */ 375 ichan->calValid &= ~currCal->calData->calType; 376 currCal->calState = CAL_WAITING; 377 378 return AH_TRUE; 379} 380 381/* 382 * Recalibrate the lower PHY chips to account for temperature/environment 383 * changes. 384 */ 385static void 386ar5416DoCalibration(struct ath_hal *ah, HAL_CHANNEL_INTERNAL *ichan, 387 uint8_t rxchainmask, HAL_CAL_LIST *currCal, HAL_BOOL *isCalDone) 388{ 389 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 390 391 /* Cal is assumed not done until explicitly set below */ 392 *isCalDone = AH_FALSE; 393 394 HALDEBUG(ah, HAL_DEBUG_PERCAL, 395 "%s: %s Calibration, state %d, calValid 0x%x\n", 396 __func__, currCal->calData->calName, currCal->calState, 397 ichan->calValid); 398 399 /* Calibration in progress. */ 400 if (currCal->calState == CAL_RUNNING) { 401 /* Check to see if it has finished. */ 402 if (!(OS_REG_READ(ah, AR_PHY_TIMING_CTRL4) & AR_PHY_TIMING_CTRL4_DO_CAL)) { 403 HALDEBUG(ah, HAL_DEBUG_PERCAL, 404 "%s: sample %d of %d finished\n", 405 __func__, cal->calSamples, 406 currCal->calData->calNumSamples); 407 /* 408 * Collect measurements for active chains. 409 */ 410 currCal->calData->calCollect(ah); 411 if (++cal->calSamples >= currCal->calData->calNumSamples) { 412 int i, numChains = 0; 413 for (i = 0; i < AR5416_MAX_CHAINS; i++) { 414 if (rxchainmask & (1 << i)) 415 numChains++; 416 } 417 /* 418 * Process accumulated data 419 */ 420 currCal->calData->calPostProc(ah, numChains); 421 422 /* Calibration has finished. */ 423 ichan->calValid |= currCal->calData->calType; 424 currCal->calState = CAL_DONE; 425 *isCalDone = AH_TRUE; 426 } else { 427 /* 428 * Set-up to collect of another sub-sample. 429 */ 430 ar5416SetupMeasurement(ah, currCal); 431 } 432 } 433 } else if (!(ichan->calValid & currCal->calData->calType)) { 434 /* If current cal is marked invalid in channel, kick it off */ 435 ar5416ResetMeasurement(ah, currCal); 436 } 437} 438 439/* 440 * Internal interface to schedule periodic calibration work. 441 */ 442HAL_BOOL 443ar5416PerCalibrationN(struct ath_hal *ah, struct ieee80211_channel *chan, 444 u_int rxchainmask, HAL_BOOL longcal, HAL_BOOL *isCalDone) 445{ 446 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 447 HAL_CAL_LIST *currCal = cal->cal_curr; 448 HAL_CHANNEL_INTERNAL *ichan; 449 int r; 450 451 OS_MARK(ah, AH_MARK_PERCAL, chan->ic_freq); 452 453 *isCalDone = AH_TRUE; 454 455 /* 456 * Since ath_hal calls the PerCal method with rxchainmask=0x1; 457 * override it with the current chainmask. The upper levels currently 458 * doesn't know about the chainmask. 459 */ 460 rxchainmask = AH5416(ah)->ah_rx_chainmask; 461 462 /* Invalid channel check */ 463 ichan = ath_hal_checkchannel(ah, chan); 464 if (ichan == AH_NULL) { 465 HALDEBUG(ah, HAL_DEBUG_ANY, 466 "%s: invalid channel %u/0x%x; no mapping\n", 467 __func__, chan->ic_freq, chan->ic_flags); 468 return AH_FALSE; 469 } 470 471 /* 472 * For given calibration: 473 * 1. Call generic cal routine 474 * 2. When this cal is done (isCalDone) if we have more cals waiting 475 * (eg after reset), mask this to upper layers by not propagating 476 * isCalDone if it is set to TRUE. 477 * Instead, change isCalDone to FALSE and setup the waiting cal(s) 478 * to be run. 479 */ 480 if (currCal != AH_NULL && 481 (currCal->calState == CAL_RUNNING || 482 currCal->calState == CAL_WAITING)) { 483 ar5416DoCalibration(ah, ichan, rxchainmask, currCal, isCalDone); 484 if (*isCalDone == AH_TRUE) { 485 cal->cal_curr = currCal = currCal->calNext; 486 if (currCal->calState == CAL_WAITING) { 487 *isCalDone = AH_FALSE; 488 ar5416ResetMeasurement(ah, currCal); 489 } 490 } 491 } 492 493 /* Do NF cal only at longer intervals */ 494 if (longcal) { 495 /* Do PA calibration if the chipset supports */ 496 if (AH5416(ah)->ah_cal_pacal) 497 AH5416(ah)->ah_cal_pacal(ah, AH_FALSE); 498 499 /* Do open-loop temperature compensation if the chipset needs it */ 500 if (ath_hal_eepromGetFlag(ah, AR_EEP_OL_PWRCTRL)) 501 AH5416(ah)->ah_olcTempCompensation(ah); 502 503 /* 504 * Get the value from the previous NF cal 505 * and update the history buffer. 506 */ 507 r = ar5416GetNf(ah, chan); 508 if (r == 0 || r == -1) { 509 /* NF calibration result isn't valid */ 510 HALDEBUG(ah, HAL_DEBUG_UNMASKABLE, "%s: NF calibration" 511 " didn't finish; delaying CCA\n", __func__); 512 } else { 513 int ret; 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 ret = ar5416LoadNF(ah, AH_PRIVATE(ah)->ah_curchan); 522 523 /* start NF calibration, without updating BB NF register*/ 524 ar5416StartNFCal(ah); 525 526 /* 527 * If we failed calibration then tell the driver 528 * we failed and it should do a full chip reset 529 */ 530 if (! ret) 531 return AH_FALSE; 532 } 533 } 534 return AH_TRUE; 535} 536 537/* 538 * Recalibrate the lower PHY chips to account for temperature/environment 539 * changes. 540 */ 541HAL_BOOL 542ar5416PerCalibration(struct ath_hal *ah, struct ieee80211_channel *chan, 543 HAL_BOOL *isIQdone) 544{ 545 struct ath_hal_5416 *ahp = AH5416(ah); 546 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 547 HAL_CAL_LIST *curCal = cal->cal_curr; 548 549 if (curCal != AH_NULL && curCal->calData->calType == IQ_MISMATCH_CAL) { 550 return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask, 551 AH_TRUE, isIQdone); 552 } else { 553 HAL_BOOL isCalDone; 554 555 *isIQdone = AH_FALSE; 556 return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask, 557 AH_TRUE, &isCalDone); 558 } 559} 560 561static HAL_BOOL 562ar5416GetEepromNoiseFloorThresh(struct ath_hal *ah, 563 const struct ieee80211_channel *chan, int16_t *nft) 564{ 565 if (IEEE80211_IS_CHAN_5GHZ(chan)) { 566 ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_5, nft); 567 return AH_TRUE; 568 } 569 if (IEEE80211_IS_CHAN_2GHZ(chan)) { 570 ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_2, nft); 571 return AH_TRUE; 572 } 573 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: invalid channel flags 0x%x\n", 574 __func__, chan->ic_flags); 575 return AH_FALSE; 576} 577 578static void 579ar5416StartNFCal(struct ath_hal *ah) 580{ 581 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF); 582 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 583 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 584} 585 586static HAL_BOOL 587ar5416LoadNF(struct ath_hal *ah, const struct ieee80211_channel *chan) 588{ 589 static const uint32_t ar5416_cca_regs[] = { 590 AR_PHY_CCA, 591 AR_PHY_CH1_CCA, 592 AR_PHY_CH2_CCA, 593 AR_PHY_EXT_CCA, 594 AR_PHY_CH1_EXT_CCA, 595 AR_PHY_CH2_EXT_CCA 596 }; 597 struct ar5212NfCalHist *h; 598 int i; 599 int32_t val; 600 uint8_t chainmask; 601 int16_t default_nf = ar5416GetDefaultNF(ah, chan); 602 603 /* 604 * Force NF calibration for all chains. 605 */ 606 if (AR_SREV_KITE(ah)) { 607 /* Kite has only one chain */ 608 chainmask = 0x9; 609 } else if (AR_SREV_MERLIN(ah) || AR_SREV_KIWI(ah)) { 610 /* Merlin/Kiwi has only two chains */ 611 chainmask = 0x1B; 612 } else { 613 chainmask = 0x3F; 614 } 615 616 /* 617 * Write filtered NF values into maxCCApwr register parameter 618 * so we can load below. 619 */ 620 h = AH5416(ah)->ah_cal.nfCalHist; 621 HALDEBUG(ah, HAL_DEBUG_NFCAL, "CCA: "); 622 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 623 /* Don't write to EXT radio CCA registers unless in HT/40 mode */ 624 /* XXX this check should really be cleaner! */ 625 if (i > 2 && !IEEE80211_IS_CHAN_HT40(chan)) 626 continue; 627 628 if (chainmask & (1 << i)) { 629 int16_t nf_val; 630 631 if (h) 632 nf_val = h[i].privNF; 633 else 634 nf_val = default_nf; 635 636 val = OS_REG_READ(ah, ar5416_cca_regs[i]); 637 val &= 0xFFFFFE00; 638 val |= (((uint32_t) nf_val << 1) & 0x1ff); 639 HALDEBUG(ah, HAL_DEBUG_NFCAL, "[%d: %d]", i, nf_val); 640 OS_REG_WRITE(ah, ar5416_cca_regs[i], val); 641 } 642 } 643 HALDEBUG(ah, HAL_DEBUG_NFCAL, "\n"); 644 645 /* Load software filtered NF value into baseband internal minCCApwr variable. */ 646 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF); 647 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 648 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 649 650 /* Wait for load to complete, should be fast, a few 10s of us. */ 651 if (! ar5212WaitNFCalComplete(ah, 1000)) { 652 /* 653 * We timed out waiting for the noisefloor to load, probably due to an 654 * in-progress rx. Simply return here and allow the load plenty of time 655 * to complete before the next calibration interval. We need to avoid 656 * trying to load -50 (which happens below) while the previous load is 657 * still in progress as this can cause rx deafness. Instead by returning 658 * here, the baseband nf cal will just be capped by our present 659 * noisefloor until the next calibration timer. 660 */ 661 HALDEBUG(ah, HAL_DEBUG_UNMASKABLE, "Timeout while waiting for " 662 "nf to load: AR_PHY_AGC_CONTROL=0x%x\n", 663 OS_REG_READ(ah, AR_PHY_AGC_CONTROL)); 664 return AH_FALSE; 665 } 666 667 /* 668 * Restore maxCCAPower register parameter again so that we're not capped 669 * by the median we just loaded. This will be initial (and max) value 670 * of next noise floor calibration the baseband does. 671 */ 672 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 673 /* Don't write to EXT radio CCA registers unless in HT/40 mode */ 674 /* XXX this check should really be cleaner! */ 675 if (i > 2 && !IEEE80211_IS_CHAN_HT40(chan)) 676 continue; 677 678 if (chainmask & (1 << i)) { 679 val = OS_REG_READ(ah, ar5416_cca_regs[i]); 680 val &= 0xFFFFFE00; 681 val |= (((uint32_t)(-50) << 1) & 0x1ff); 682 OS_REG_WRITE(ah, ar5416_cca_regs[i], val); 683 } 684 } 685 return AH_TRUE; 686} 687 688/* 689 * This just initialises the "good" values for AR5416 which 690 * may not be right; it'lll be overridden by ar5416SanitizeNF() 691 * to nominal values. 692 */ 693void 694ar5416InitNfHistBuff(struct ar5212NfCalHist *h) 695{ 696 int i, j; 697 698 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 699 h[i].currIndex = 0; 700 h[i].privNF = AR5416_CCA_MAX_GOOD_VALUE; 701 h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX; 702 for (j = 0; j < AR512_NF_CAL_HIST_MAX; j ++) 703 h[i].nfCalBuffer[j] = AR5416_CCA_MAX_GOOD_VALUE; 704 } 705} 706 707/* 708 * Update the noise floor buffer as a ring buffer 709 */ 710static void 711ar5416UpdateNFHistBuff(struct ath_hal *ah, struct ar5212NfCalHist *h, 712 int16_t *nfarray) 713{ 714 int i; 715 716 /* XXX TODO: don't record nfarray[] entries for inactive chains */ 717 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 718 h[i].nfCalBuffer[h[i].currIndex] = nfarray[i]; 719 720 if (++h[i].currIndex >= AR512_NF_CAL_HIST_MAX) 721 h[i].currIndex = 0; 722 if (h[i].invalidNFcount > 0) { 723 if (nfarray[i] < AR5416_CCA_MIN_BAD_VALUE || 724 nfarray[i] > AR5416_CCA_MAX_HIGH_VALUE) { 725 h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX; 726 } else { 727 h[i].invalidNFcount--; 728 h[i].privNF = nfarray[i]; 729 } 730 } else { 731 h[i].privNF = ar5212GetNfHistMid(h[i].nfCalBuffer); 732 } 733 } 734} 735 736static uint16_t 737ar5416GetDefaultNF(struct ath_hal *ah, const struct ieee80211_channel *chan) 738{ 739 struct ar5416NfLimits *limit; 740 741 if (!chan || IEEE80211_IS_CHAN_2GHZ(chan)) 742 limit = &AH5416(ah)->nf_2g; 743 else 744 limit = &AH5416(ah)->nf_5g; 745 746 return limit->nominal; 747} 748 749static void 750ar5416SanitizeNF(struct ath_hal *ah, int16_t *nf) 751{ 752 753 struct ar5416NfLimits *limit; 754 int i; 755 756 if (IEEE80211_IS_CHAN_2GHZ(AH_PRIVATE(ah)->ah_curchan)) 757 limit = &AH5416(ah)->nf_2g; 758 else 759 limit = &AH5416(ah)->nf_5g; 760 761 for (i = 0; i < AR5416_NUM_NF_READINGS; i++) { 762 if (!nf[i]) 763 continue; 764 765 if (nf[i] > limit->max) { 766 HALDEBUG(ah, HAL_DEBUG_NFCAL, 767 "NF[%d] (%d) > MAX (%d), correcting to MAX\n", 768 i, nf[i], limit->max); 769 nf[i] = limit->max; 770 } else if (nf[i] < limit->min) { 771 HALDEBUG(ah, HAL_DEBUG_NFCAL, 772 "NF[%d] (%d) < MIN (%d), correcting to NOM\n", 773 i, nf[i], limit->min); 774 nf[i] = limit->nominal; 775 } 776 } 777} 778 779/* 780 * Read the NF and check it against the noise floor threshold 781 * 782 * Return 0 if the NF calibration hadn't finished, 0 if it was 783 * invalid, or > 0 for a valid NF reading. 784 */ 785static int16_t 786ar5416GetNf(struct ath_hal *ah, struct ieee80211_channel *chan) 787{ 788 int16_t nf, nfThresh; 789 int i; 790 int retval = 0; 791 792 if (ar5212IsNFCalInProgress(ah)) { 793 HALDEBUG(ah, HAL_DEBUG_ANY, 794 "%s: NF didn't complete in calibration window\n", __func__); 795 nf = 0; 796 retval = -1; /* NF didn't finish */ 797 } else { 798 /* Finished NF cal, check against threshold */ 799 int16_t nfarray[NUM_NOISEFLOOR_READINGS] = { 0 }; 800 HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan); 801 802 /* TODO - enhance for multiple chains and ext ch */ 803 ath_hal_getNoiseFloor(ah, nfarray); 804 nf = nfarray[0]; 805 ar5416SanitizeNF(ah, nfarray); 806 if (ar5416GetEepromNoiseFloorThresh(ah, chan, &nfThresh)) { 807 if (nf > nfThresh) { 808 HALDEBUG(ah, HAL_DEBUG_UNMASKABLE, 809 "%s: noise floor failed detected; " 810 "detected %d, threshold %d\n", __func__, 811 nf, nfThresh); 812 /* 813 * NB: Don't discriminate 2.4 vs 5Ghz, if this 814 * happens it indicates a problem regardless 815 * of the band. 816 */ 817 chan->ic_state |= IEEE80211_CHANSTATE_CWINT; 818 nf = 0; 819 retval = 0; 820 } 821 } else { 822 nf = 0; 823 retval = 0; 824 } 825 /* Update MIMO channel statistics, regardless of validity or not (for now) */ 826 for (i = 0; i < 3; i++) { 827 ichan->noiseFloorCtl[i] = nfarray[i]; 828 ichan->noiseFloorExt[i] = nfarray[i + 3]; 829 } 830 ichan->privFlags |= CHANNEL_MIMO_NF_VALID; 831 832 ar5416UpdateNFHistBuff(ah, AH5416(ah)->ah_cal.nfCalHist, nfarray); 833 ichan->rawNoiseFloor = nf; 834 retval = nf; 835 } 836 return retval; 837} 838