ar5416_cal.c revision 218068
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: head/sys/dev/ath/ath_hal/ar5416/ar5416_cal.c 218068 2011-01-29 14:27:20Z adrian $ 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 void 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 /* Run ADC Gain Cal for non-CCK & non 2GHz-HT20 only */ 76 return !IEEE80211_IS_CHAN_B(chan) && 77 !(IEEE80211_IS_CHAN_2GHZ(chan) && IEEE80211_IS_CHAN_HT20(chan)); 78 } 79 return AH_FALSE; 80} 81 82/* 83 * Setup HW to collect samples used for current cal 84 */ 85static void 86ar5416SetupMeasurement(struct ath_hal *ah, HAL_CAL_LIST *currCal) 87{ 88 /* Start calibration w/ 2^(INIT_IQCAL_LOG_COUNT_MAX+1) samples */ 89 OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4, 90 AR_PHY_TIMING_CTRL4_IQCAL_LOG_COUNT_MAX, 91 currCal->calData->calCountMax); 92 93 /* Select calibration to run */ 94 switch (currCal->calData->calType) { 95 case IQ_MISMATCH_CAL: 96 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_IQ); 97 HALDEBUG(ah, HAL_DEBUG_PERCAL, 98 "%s: start IQ Mismatch calibration\n", __func__); 99 break; 100 case ADC_GAIN_CAL: 101 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_GAIN); 102 HALDEBUG(ah, HAL_DEBUG_PERCAL, 103 "%s: start ADC Gain calibration\n", __func__); 104 break; 105 case ADC_DC_CAL: 106 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_DC_PER); 107 HALDEBUG(ah, HAL_DEBUG_PERCAL, 108 "%s: start ADC DC calibration\n", __func__); 109 break; 110 case ADC_DC_INIT_CAL: 111 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_DC_INIT); 112 HALDEBUG(ah, HAL_DEBUG_PERCAL, 113 "%s: start Init ADC DC calibration\n", __func__); 114 break; 115 } 116 /* Kick-off cal */ 117 OS_REG_SET_BIT(ah, AR_PHY_TIMING_CTRL4, AR_PHY_TIMING_CTRL4_DO_CAL); 118} 119 120/* 121 * Initialize shared data structures and prepare a cal to be run. 122 */ 123static void 124ar5416ResetMeasurement(struct ath_hal *ah, HAL_CAL_LIST *currCal) 125{ 126 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 127 128 /* Reset data structures shared between different calibrations */ 129 OS_MEMZERO(cal->caldata, sizeof(cal->caldata)); 130 cal->calSamples = 0; 131 132 /* Setup HW for new calibration */ 133 ar5416SetupMeasurement(ah, currCal); 134 135 /* Change SW state to RUNNING for this calibration */ 136 currCal->calState = CAL_RUNNING; 137} 138 139#if 0 140/* 141 * Run non-periodic calibrations. 142 */ 143static HAL_BOOL 144ar5416RunInitCals(struct ath_hal *ah, int init_cal_count) 145{ 146 struct ath_hal_5416 *ahp = AH5416(ah); 147 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 148 HAL_CHANNEL_INTERNAL ichan; /* XXX bogus */ 149 HAL_CAL_LIST *curCal = ahp->ah_cal_curr; 150 HAL_BOOL isCalDone; 151 int i; 152 153 if (curCal == AH_NULL) 154 return AH_FALSE; 155 156 ichan.calValid = 0; 157 for (i = 0; i < init_cal_count; i++) { 158 /* Reset this Cal */ 159 ar5416ResetMeasurement(ah, curCal); 160 /* Poll for offset calibration complete */ 161 if (!ath_hal_wait(ah, AR_PHY_TIMING_CTRL4, AR_PHY_TIMING_CTRL4_DO_CAL, 0)) { 162 HALDEBUG(ah, HAL_DEBUG_ANY, 163 "%s: Cal %d failed to finish in 100ms.\n", 164 __func__, curCal->calData->calType); 165 /* Re-initialize list pointers for periodic cals */ 166 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL; 167 return AH_FALSE; 168 } 169 /* Run this cal */ 170 ar5416DoCalibration(ah, &ichan, ahp->ah_rxchainmask, 171 curCal, &isCalDone); 172 if (!isCalDone) 173 HALDEBUG(ah, HAL_DEBUG_ANY, 174 "%s: init cal %d did not complete.\n", 175 __func__, curCal->calData->calType); 176 if (curCal->calNext != AH_NULL) 177 curCal = curCal->calNext; 178 } 179 180 /* Re-initialize list pointers for periodic cals */ 181 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL; 182 return AH_TRUE; 183} 184#endif 185 186/* 187 * Initialize Calibration infrastructure. 188 */ 189HAL_BOOL 190ar5416InitCal(struct ath_hal *ah, const struct ieee80211_channel *chan) 191{ 192 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 193 HAL_CHANNEL_INTERNAL *ichan; 194 195 ichan = ath_hal_checkchannel(ah, chan); 196 HALASSERT(ichan != AH_NULL); 197 198 if (AR_SREV_MERLIN_10_OR_LATER(ah)) { 199 /* Enable Rx Filter Cal */ 200 OS_REG_CLR_BIT(ah, AR_PHY_ADC_CTL, AR_PHY_ADC_CTL_OFF_PWDADC); 201 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, 202 AR_PHY_AGC_CONTROL_FLTR_CAL); 203 204 /* Clear the carrier leak cal bit */ 205 OS_REG_CLR_BIT(ah, AR_PHY_CL_CAL_CTL, AR_PHY_CL_CAL_ENABLE); 206 207 /* kick off the cal */ 208 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL); 209 210 /* Poll for offset calibration complete */ 211 if (!ath_hal_wait(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL, 0)) { 212 HALDEBUG(ah, HAL_DEBUG_ANY, 213 "%s: offset calibration failed to complete in 1ms; " 214 "noisy environment?\n", __func__); 215 return AH_FALSE; 216 } 217 218 /* Set the cl cal bit and rerun the cal a 2nd time */ 219 /* Enable Rx Filter Cal */ 220 OS_REG_CLR_BIT(ah, AR_PHY_ADC_CTL, AR_PHY_ADC_CTL_OFF_PWDADC); 221 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, 222 AR_PHY_AGC_CONTROL_FLTR_CAL); 223 224 OS_REG_SET_BIT(ah, AR_PHY_CL_CAL_CTL, AR_PHY_CL_CAL_ENABLE); 225 } 226 227 /* Calibrate the AGC */ 228 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL); 229 230 /* Poll for offset calibration complete */ 231 if (!ath_hal_wait(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL, 0)) { 232 HALDEBUG(ah, HAL_DEBUG_ANY, 233 "%s: offset calibration did not complete in 1ms; " 234 "noisy environment?\n", __func__); 235 return AH_FALSE; 236 } 237 238 /* 239 * Do NF calibration after DC offset and other CALs. 240 * Per system engineers, noise floor value can sometimes be 20 dB 241 * higher than normal value if DC offset and noise floor cal are 242 * triggered at the same time. 243 */ 244 /* XXX this actually kicks off a NF calibration -adrian */ 245 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 246 /* 247 * Try to make sure the above NF cal completes, just so 248 * it doesn't clash with subsequent percals -adrian 249 */ 250 if (! ar5212WaitNFCalComplete(ah, 10000)) { 251 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: initial NF calibration did " 252 "not complete in time; noisy environment?\n", __func__); 253 return AH_FALSE; 254 } 255 256 /* Initialize list pointers */ 257 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL; 258 259 /* 260 * Enable IQ, ADC Gain, ADC DC Offset Cals 261 */ 262 if (AR_SREV_SOWL_10_OR_LATER(ah)) { 263 /* Setup all non-periodic, init time only calibrations */ 264 /* XXX: Init DC Offset not working yet */ 265#if 0 266 if (ar5416IsCalSupp(ah, chan, ADC_DC_INIT_CAL)) { 267 INIT_CAL(&cal->adcDcCalInitData); 268 INSERT_CAL(cal, &cal->adcDcCalInitData); 269 } 270 /* Initialize current pointer to first element in list */ 271 cal->cal_curr = cal->cal_list; 272 273 if (cal->ah_cal_curr != AH_NULL && !ar5416RunInitCals(ah, 0)) 274 return AH_FALSE; 275#endif 276 } 277 278 /* If Cals are supported, add them to list via INIT/INSERT_CAL */ 279 if (ar5416IsCalSupp(ah, chan, ADC_GAIN_CAL)) { 280 INIT_CAL(&cal->adcGainCalData); 281 INSERT_CAL(cal, &cal->adcGainCalData); 282 HALDEBUG(ah, HAL_DEBUG_PERCAL, 283 "%s: enable ADC Gain Calibration.\n", __func__); 284 } 285 if (ar5416IsCalSupp(ah, chan, ADC_DC_CAL)) { 286 INIT_CAL(&cal->adcDcCalData); 287 INSERT_CAL(cal, &cal->adcDcCalData); 288 HALDEBUG(ah, HAL_DEBUG_PERCAL, 289 "%s: enable ADC DC Calibration.\n", __func__); 290 } 291 if (ar5416IsCalSupp(ah, chan, IQ_MISMATCH_CAL)) { 292 INIT_CAL(&cal->iqCalData); 293 INSERT_CAL(cal, &cal->iqCalData); 294 HALDEBUG(ah, HAL_DEBUG_PERCAL, 295 "%s: enable IQ Calibration.\n", __func__); 296 } 297 /* Initialize current pointer to first element in list */ 298 cal->cal_curr = cal->cal_list; 299 300 /* Kick off measurements for the first cal */ 301 if (cal->cal_curr != AH_NULL) 302 ar5416ResetMeasurement(ah, cal->cal_curr); 303 304 /* Mark all calibrations on this channel as being invalid */ 305 ichan->calValid = 0; 306 307 return AH_TRUE; 308} 309 310/* 311 * Entry point for upper layers to restart current cal. 312 * Reset the calibration valid bit in channel. 313 */ 314HAL_BOOL 315ar5416ResetCalValid(struct ath_hal *ah, const struct ieee80211_channel *chan) 316{ 317 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 318 HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan); 319 HAL_CAL_LIST *currCal = cal->cal_curr; 320 321 if (!AR_SREV_SOWL_10_OR_LATER(ah)) 322 return AH_FALSE; 323 if (currCal == AH_NULL) 324 return AH_FALSE; 325 if (ichan == AH_NULL) { 326 HALDEBUG(ah, HAL_DEBUG_ANY, 327 "%s: invalid channel %u/0x%x; no mapping\n", 328 __func__, chan->ic_freq, chan->ic_flags); 329 return AH_FALSE; 330 } 331 /* 332 * Expected that this calibration has run before, post-reset. 333 * Current state should be done 334 */ 335 if (currCal->calState != CAL_DONE) { 336 HALDEBUG(ah, HAL_DEBUG_ANY, 337 "%s: Calibration state incorrect, %d\n", 338 __func__, currCal->calState); 339 return AH_FALSE; 340 } 341 342 /* Verify Cal is supported on this channel */ 343 if (!ar5416IsCalSupp(ah, chan, currCal->calData->calType)) 344 return AH_FALSE; 345 346 HALDEBUG(ah, HAL_DEBUG_PERCAL, 347 "%s: Resetting Cal %d state for channel %u/0x%x\n", 348 __func__, currCal->calData->calType, chan->ic_freq, 349 chan->ic_flags); 350 351 /* Disable cal validity in channel */ 352 ichan->calValid &= ~currCal->calData->calType; 353 currCal->calState = CAL_WAITING; 354 355 return AH_TRUE; 356} 357 358/* 359 * Recalibrate the lower PHY chips to account for temperature/environment 360 * changes. 361 */ 362static void 363ar5416DoCalibration(struct ath_hal *ah, HAL_CHANNEL_INTERNAL *ichan, 364 uint8_t rxchainmask, HAL_CAL_LIST *currCal, HAL_BOOL *isCalDone) 365{ 366 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 367 368 /* Cal is assumed not done until explicitly set below */ 369 *isCalDone = AH_FALSE; 370 371 HALDEBUG(ah, HAL_DEBUG_PERCAL, 372 "%s: %s Calibration, state %d, calValid 0x%x\n", 373 __func__, currCal->calData->calName, currCal->calState, 374 ichan->calValid); 375 376 /* Calibration in progress. */ 377 if (currCal->calState == CAL_RUNNING) { 378 /* Check to see if it has finished. */ 379 if (!(OS_REG_READ(ah, AR_PHY_TIMING_CTRL4) & AR_PHY_TIMING_CTRL4_DO_CAL)) { 380 HALDEBUG(ah, HAL_DEBUG_PERCAL, 381 "%s: sample %d of %d finished\n", 382 __func__, cal->calSamples, 383 currCal->calData->calNumSamples); 384 /* 385 * Collect measurements for active chains. 386 */ 387 currCal->calData->calCollect(ah); 388 if (++cal->calSamples >= currCal->calData->calNumSamples) { 389 int i, numChains = 0; 390 for (i = 0; i < AR5416_MAX_CHAINS; i++) { 391 if (rxchainmask & (1 << i)) 392 numChains++; 393 } 394 /* 395 * Process accumulated data 396 */ 397 currCal->calData->calPostProc(ah, numChains); 398 399 /* Calibration has finished. */ 400 ichan->calValid |= currCal->calData->calType; 401 currCal->calState = CAL_DONE; 402 *isCalDone = AH_TRUE; 403 } else { 404 /* 405 * Set-up to collect of another sub-sample. 406 */ 407 ar5416SetupMeasurement(ah, currCal); 408 } 409 } 410 } else if (!(ichan->calValid & currCal->calData->calType)) { 411 /* If current cal is marked invalid in channel, kick it off */ 412 ar5416ResetMeasurement(ah, currCal); 413 } 414} 415 416/* 417 * Internal interface to schedule periodic calibration work. 418 */ 419HAL_BOOL 420ar5416PerCalibrationN(struct ath_hal *ah, struct ieee80211_channel *chan, 421 u_int rxchainmask, HAL_BOOL longcal, HAL_BOOL *isCalDone) 422{ 423 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 424 HAL_CAL_LIST *currCal = cal->cal_curr; 425 HAL_CHANNEL_INTERNAL *ichan; 426 427 OS_MARK(ah, AH_MARK_PERCAL, chan->ic_freq); 428 429 *isCalDone = AH_TRUE; 430 431 /* 432 * Since ath_hal calls the PerCal method with rxchainmask=0x1; 433 * override it with the current chainmask. The upper levels currently 434 * doesn't know about the chainmask. 435 */ 436 rxchainmask = AH5416(ah)->ah_rx_chainmask; 437 438 /* Invalid channel check */ 439 ichan = ath_hal_checkchannel(ah, chan); 440 if (ichan == AH_NULL) { 441 HALDEBUG(ah, HAL_DEBUG_ANY, 442 "%s: invalid channel %u/0x%x; no mapping\n", 443 __func__, chan->ic_freq, chan->ic_flags); 444 return AH_FALSE; 445 } 446 447 /* 448 * For given calibration: 449 * 1. Call generic cal routine 450 * 2. When this cal is done (isCalDone) if we have more cals waiting 451 * (eg after reset), mask this to upper layers by not propagating 452 * isCalDone if it is set to TRUE. 453 * Instead, change isCalDone to FALSE and setup the waiting cal(s) 454 * to be run. 455 */ 456 if (currCal != AH_NULL && 457 (currCal->calState == CAL_RUNNING || 458 currCal->calState == CAL_WAITING)) { 459 ar5416DoCalibration(ah, ichan, rxchainmask, currCal, isCalDone); 460 if (*isCalDone == AH_TRUE) { 461 cal->cal_curr = currCal = currCal->calNext; 462 if (currCal->calState == CAL_WAITING) { 463 *isCalDone = AH_FALSE; 464 ar5416ResetMeasurement(ah, currCal); 465 } 466 } 467 } 468 469 /* Do NF cal only at longer intervals */ 470 if (longcal) { 471 /* 472 * Get the value from the previous NF cal 473 * and update the history buffer. 474 */ 475 ar5416GetNf(ah, chan); 476 477 /* 478 * Load the NF from history buffer of the current channel. 479 * NF is slow time-variant, so it is OK to use a 480 * historical value. 481 */ 482 ar5416LoadNF(ah, AH_PRIVATE(ah)->ah_curchan); 483 484 /* start NF calibration, without updating BB NF register*/ 485 ar5416StartNFCal(ah); 486 } 487 return AH_TRUE; 488} 489 490/* 491 * Recalibrate the lower PHY chips to account for temperature/environment 492 * changes. 493 */ 494HAL_BOOL 495ar5416PerCalibration(struct ath_hal *ah, struct ieee80211_channel *chan, 496 HAL_BOOL *isIQdone) 497{ 498 struct ath_hal_5416 *ahp = AH5416(ah); 499 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 500 HAL_CAL_LIST *curCal = cal->cal_curr; 501 502 if (curCal != AH_NULL && curCal->calData->calType == IQ_MISMATCH_CAL) { 503 return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask, 504 AH_TRUE, isIQdone); 505 } else { 506 HAL_BOOL isCalDone; 507 508 *isIQdone = AH_FALSE; 509 return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask, 510 AH_TRUE, &isCalDone); 511 } 512} 513 514static HAL_BOOL 515ar5416GetEepromNoiseFloorThresh(struct ath_hal *ah, 516 const struct ieee80211_channel *chan, int16_t *nft) 517{ 518 if (IEEE80211_IS_CHAN_5GHZ(chan)) { 519 ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_5, nft); 520 return AH_TRUE; 521 } 522 if (IEEE80211_IS_CHAN_2GHZ(chan)) { 523 ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_2, nft); 524 return AH_TRUE; 525 } 526 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: invalid channel flags 0x%x\n", 527 __func__, chan->ic_flags); 528 return AH_FALSE; 529} 530 531static void 532ar5416StartNFCal(struct ath_hal *ah) 533{ 534 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF); 535 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 536 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 537} 538 539static void 540ar5416LoadNF(struct ath_hal *ah, const struct ieee80211_channel *chan) 541{ 542 static const uint32_t ar5416_cca_regs[] = { 543 AR_PHY_CCA, 544 AR_PHY_CH1_CCA, 545 AR_PHY_CH2_CCA, 546 AR_PHY_EXT_CCA, 547 AR_PHY_CH1_EXT_CCA, 548 AR_PHY_CH2_EXT_CCA 549 }; 550 struct ar5212NfCalHist *h; 551 int i; 552 int32_t val; 553 uint8_t chainmask; 554 int16_t default_nf = ar5416GetDefaultNF(ah, chan); 555 556 /* 557 * Force NF calibration for all chains. 558 */ 559 if (AR_SREV_KITE(ah)) { 560 /* Kite has only one chain */ 561 chainmask = 0x9; 562 } else if (AR_SREV_MERLIN(ah)) { 563 /* Merlin has only two chains */ 564 chainmask = 0x1B; 565 } else { 566 chainmask = 0x3F; 567 } 568 569 /* 570 * Write filtered NF values into maxCCApwr register parameter 571 * so we can load below. 572 */ 573 h = AH5416(ah)->ah_cal.nfCalHist; 574 HALDEBUG(ah, HAL_DEBUG_NFCAL, "CCA: "); 575 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 576 if (chainmask & (1 << i)) { 577 int16_t nf_val; 578 579 if (h) 580 nf_val = h[i].privNF; 581 else 582 nf_val = default_nf; 583 584 val = OS_REG_READ(ah, ar5416_cca_regs[i]); 585 val &= 0xFFFFFE00; 586 val |= (((uint32_t) nf_val << 1) & 0x1ff); 587 HALDEBUG(ah, HAL_DEBUG_NFCAL, "[%d: %d]", i, nf_val); 588 OS_REG_WRITE(ah, ar5416_cca_regs[i], val); 589 } 590 } 591 HALDEBUG(ah, HAL_DEBUG_NFCAL, "\n"); 592 593 /* Load software filtered NF value into baseband internal minCCApwr variable. */ 594 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF); 595 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 596 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 597 598 /* Wait for load to complete, should be fast, a few 10s of us. */ 599 if (! ar5212WaitNFCalComplete(ah, 1000)) { 600 /* 601 * We timed out waiting for the noisefloor to load, probably due to an 602 * in-progress rx. Simply return here and allow the load plenty of time 603 * to complete before the next calibration interval. We need to avoid 604 * trying to load -50 (which happens below) while the previous load is 605 * still in progress as this can cause rx deafness. Instead by returning 606 * here, the baseband nf cal will just be capped by our present 607 * noisefloor until the next calibration timer. 608 */ 609 HALDEBUG(ah, HAL_DEBUG_ANY, "Timeout while waiting for nf " 610 "to load: AR_PHY_AGC_CONTROL=0x%x\n", 611 OS_REG_READ(ah, AR_PHY_AGC_CONTROL)); 612 return; 613 } 614 615 /* 616 * Restore maxCCAPower register parameter again so that we're not capped 617 * by the median we just loaded. This will be initial (and max) value 618 * of next noise floor calibration the baseband does. 619 */ 620 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) 621 if (chainmask & (1 << i)) { 622 val = OS_REG_READ(ah, ar5416_cca_regs[i]); 623 val &= 0xFFFFFE00; 624 val |= (((uint32_t)(-50) << 1) & 0x1ff); 625 OS_REG_WRITE(ah, ar5416_cca_regs[i], val); 626 } 627} 628 629/* 630 * This just initialises the "good" values for AR5416 which 631 * may not be right; it'lll be overridden by ar5416SanitizeNF() 632 * to nominal values. 633 */ 634void 635ar5416InitNfHistBuff(struct ar5212NfCalHist *h) 636{ 637 int i, j; 638 639 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 640 h[i].currIndex = 0; 641 h[i].privNF = AR5416_CCA_MAX_GOOD_VALUE; 642 h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX; 643 for (j = 0; j < AR512_NF_CAL_HIST_MAX; j ++) 644 h[i].nfCalBuffer[j] = AR5416_CCA_MAX_GOOD_VALUE; 645 } 646} 647 648/* 649 * Update the noise floor buffer as a ring buffer 650 */ 651static void 652ar5416UpdateNFHistBuff(struct ar5212NfCalHist *h, int16_t *nfarray) 653{ 654 int i; 655 656 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 657 h[i].nfCalBuffer[h[i].currIndex] = nfarray[i]; 658 659 if (++h[i].currIndex >= AR512_NF_CAL_HIST_MAX) 660 h[i].currIndex = 0; 661 if (h[i].invalidNFcount > 0) { 662 if (nfarray[i] < AR5416_CCA_MIN_BAD_VALUE || 663 nfarray[i] > AR5416_CCA_MAX_HIGH_VALUE) { 664 h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX; 665 } else { 666 h[i].invalidNFcount--; 667 h[i].privNF = nfarray[i]; 668 } 669 } else { 670 h[i].privNF = ar5212GetNfHistMid(h[i].nfCalBuffer); 671 } 672 } 673} 674 675static uint16_t 676ar5416GetDefaultNF(struct ath_hal *ah, const struct ieee80211_channel *chan) 677{ 678 struct ar5416NfLimits *limit; 679 680 if (!chan || IEEE80211_IS_CHAN_2GHZ(chan)) 681 limit = &AH5416(ah)->nf_2g; 682 else 683 limit = &AH5416(ah)->nf_5g; 684 685 return limit->nominal; 686} 687 688static void 689ar5416SanitizeNF(struct ath_hal *ah, int16_t *nf) 690{ 691 692 struct ar5416NfLimits *limit; 693 int i; 694 695 if (IEEE80211_IS_CHAN_2GHZ(AH_PRIVATE(ah)->ah_curchan)) 696 limit = &AH5416(ah)->nf_2g; 697 else 698 limit = &AH5416(ah)->nf_5g; 699 700 for (i = 0; i < AR5416_NUM_NF_READINGS; i++) { 701 if (!nf[i]) 702 continue; 703 704 if (nf[i] > limit->max) { 705 HALDEBUG(ah, HAL_DEBUG_NFCAL, 706 "NF[%d] (%d) > MAX (%d), correcting to MAX\n", 707 i, nf[i], limit->max); 708 nf[i] = limit->max; 709 } else if (nf[i] < limit->min) { 710 HALDEBUG(ah, HAL_DEBUG_NFCAL, 711 "NF[%d] (%d) < MIN (%d), correcting to NOM\n", 712 i, nf[i], limit->min); 713 nf[i] = limit->nominal; 714 } 715 } 716} 717 718 719/* 720 * Read the NF and check it against the noise floor threshhold 721 */ 722static int16_t 723ar5416GetNf(struct ath_hal *ah, struct ieee80211_channel *chan) 724{ 725 int16_t nf, nfThresh; 726 727 if (ar5212IsNFCalInProgress(ah)) { 728 HALDEBUG(ah, HAL_DEBUG_ANY, 729 "%s: NF didn't complete in calibration window\n", __func__); 730 nf = 0; 731 } else { 732 /* Finished NF cal, check against threshold */ 733 int16_t nfarray[NUM_NOISEFLOOR_READINGS] = { 0 }; 734 HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan); 735 736 /* TODO - enhance for multiple chains and ext ch */ 737 ath_hal_getNoiseFloor(ah, nfarray); 738 nf = nfarray[0]; 739 ar5416SanitizeNF(ah, nfarray); 740 if (ar5416GetEepromNoiseFloorThresh(ah, chan, &nfThresh)) { 741 if (nf > nfThresh) { 742 HALDEBUG(ah, HAL_DEBUG_ANY, 743 "%s: noise floor failed detected; " 744 "detected %d, threshold %d\n", __func__, 745 nf, nfThresh); 746 /* 747 * NB: Don't discriminate 2.4 vs 5Ghz, if this 748 * happens it indicates a problem regardless 749 * of the band. 750 */ 751 chan->ic_state |= IEEE80211_CHANSTATE_CWINT; 752 nf = 0; 753 } 754 } else { 755 nf = 0; 756 } 757 ar5416UpdateNFHistBuff(AH5416(ah)->ah_cal.nfCalHist, nfarray); 758 ichan->rawNoiseFloor = nf; 759 } 760 return nf; 761} 762