ar5416_cal.c revision 211211
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 211211 2010-08-12 06:20:54Z 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 40/* 41 * Determine if calibration is supported by device and channel flags 42 */ 43static OS_INLINE HAL_BOOL 44ar5416IsCalSupp(struct ath_hal *ah, const struct ieee80211_channel *chan, 45 HAL_CAL_TYPE calType) 46{ 47 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 48 49 switch (calType & cal->suppCals) { 50 case IQ_MISMATCH_CAL: 51 /* Run IQ Mismatch for non-CCK only */ 52 return !IEEE80211_IS_CHAN_B(chan); 53 case ADC_GAIN_CAL: 54 case ADC_DC_CAL: 55 /* Run ADC Gain Cal for non-CCK & non 2GHz-HT20 only */ 56 return !IEEE80211_IS_CHAN_B(chan) && 57 !(IEEE80211_IS_CHAN_2GHZ(chan) && IEEE80211_IS_CHAN_HT20(chan)); 58 } 59 return AH_FALSE; 60} 61 62/* 63 * Setup HW to collect samples used for current cal 64 */ 65static void 66ar5416SetupMeasurement(struct ath_hal *ah, HAL_CAL_LIST *currCal) 67{ 68 /* Start calibration w/ 2^(INIT_IQCAL_LOG_COUNT_MAX+1) samples */ 69 OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4, 70 AR_PHY_TIMING_CTRL4_IQCAL_LOG_COUNT_MAX, 71 currCal->calData->calCountMax); 72 73 /* Select calibration to run */ 74 switch (currCal->calData->calType) { 75 case IQ_MISMATCH_CAL: 76 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_IQ); 77 HALDEBUG(ah, HAL_DEBUG_PERCAL, 78 "%s: start IQ Mismatch calibration\n", __func__); 79 break; 80 case ADC_GAIN_CAL: 81 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_GAIN); 82 HALDEBUG(ah, HAL_DEBUG_PERCAL, 83 "%s: start ADC Gain calibration\n", __func__); 84 break; 85 case ADC_DC_CAL: 86 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_DC_PER); 87 HALDEBUG(ah, HAL_DEBUG_PERCAL, 88 "%s: start ADC DC calibration\n", __func__); 89 break; 90 case ADC_DC_INIT_CAL: 91 OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_DC_INIT); 92 HALDEBUG(ah, HAL_DEBUG_PERCAL, 93 "%s: start Init ADC DC calibration\n", __func__); 94 break; 95 } 96 /* Kick-off cal */ 97 OS_REG_SET_BIT(ah, AR_PHY_TIMING_CTRL4, AR_PHY_TIMING_CTRL4_DO_CAL); 98} 99 100/* 101 * Initialize shared data structures and prepare a cal to be run. 102 */ 103static void 104ar5416ResetMeasurement(struct ath_hal *ah, HAL_CAL_LIST *currCal) 105{ 106 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 107 108 /* Reset data structures shared between different calibrations */ 109 OS_MEMZERO(cal->caldata, sizeof(cal->caldata)); 110 cal->calSamples = 0; 111 112 /* Setup HW for new calibration */ 113 ar5416SetupMeasurement(ah, currCal); 114 115 /* Change SW state to RUNNING for this calibration */ 116 currCal->calState = CAL_RUNNING; 117} 118 119#if 0 120/* 121 * Run non-periodic calibrations. 122 */ 123static HAL_BOOL 124ar5416RunInitCals(struct ath_hal *ah, int init_cal_count) 125{ 126 struct ath_hal_5416 *ahp = AH5416(ah); 127 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 128 HAL_CHANNEL_INTERNAL ichan; /* XXX bogus */ 129 HAL_CAL_LIST *curCal = ahp->ah_cal_curr; 130 HAL_BOOL isCalDone; 131 int i; 132 133 if (curCal == AH_NULL) 134 return AH_FALSE; 135 136 ichan.calValid = 0; 137 for (i = 0; i < init_cal_count; i++) { 138 /* Reset this Cal */ 139 ar5416ResetMeasurement(ah, curCal); 140 /* Poll for offset calibration complete */ 141 if (!ath_hal_wait(ah, AR_PHY_TIMING_CTRL4, AR_PHY_TIMING_CTRL4_DO_CAL, 0)) { 142 HALDEBUG(ah, HAL_DEBUG_ANY, 143 "%s: Cal %d failed to finish in 100ms.\n", 144 __func__, curCal->calData->calType); 145 /* Re-initialize list pointers for periodic cals */ 146 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL; 147 return AH_FALSE; 148 } 149 /* Run this cal */ 150 ar5416DoCalibration(ah, &ichan, ahp->ah_rxchainmask, 151 curCal, &isCalDone); 152 if (!isCalDone) 153 HALDEBUG(ah, HAL_DEBUG_ANY, 154 "%s: init cal %d did not complete.\n", 155 __func__, curCal->calData->calType); 156 if (curCal->calNext != AH_NULL) 157 curCal = curCal->calNext; 158 } 159 160 /* Re-initialize list pointers for periodic cals */ 161 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL; 162 return AH_TRUE; 163} 164#endif 165 166/* 167 * Initialize Calibration infrastructure. 168 */ 169HAL_BOOL 170ar5416InitCal(struct ath_hal *ah, const struct ieee80211_channel *chan) 171{ 172 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 173 HAL_CHANNEL_INTERNAL *ichan; 174 175 ichan = ath_hal_checkchannel(ah, chan); 176 HALASSERT(ichan != AH_NULL); 177 178 if (AR_SREV_MERLIN_10_OR_LATER(ah)) { 179 /* Enable Rx Filter Cal */ 180 OS_REG_CLR_BIT(ah, AR_PHY_ADC_CTL, AR_PHY_ADC_CTL_OFF_PWDADC); 181 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, 182 AR_PHY_AGC_CONTROL_FLTR_CAL); 183 184 /* Clear the carrier leak cal bit */ 185 OS_REG_CLR_BIT(ah, AR_PHY_CL_CAL_CTL, AR_PHY_CL_CAL_ENABLE); 186 187 /* kick off the cal */ 188 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL); 189 190 /* Poll for offset calibration complete */ 191 if (!ath_hal_wait(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL, 0)) { 192 HALDEBUG(ah, HAL_DEBUG_ANY, 193 "%s: offset calibration failed to complete in 1ms; " 194 "noisy environment?\n", __func__); 195 return AH_FALSE; 196 } 197 198 /* Set the cl cal bit and rerun the cal a 2nd time */ 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 OS_REG_SET_BIT(ah, AR_PHY_CL_CAL_CTL, AR_PHY_CL_CAL_ENABLE); 205 } 206 207 /* Calibrate the AGC */ 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 did not complete in 1ms; " 214 "noisy environment?\n", __func__); 215 return AH_FALSE; 216 } 217 218 /* 219 * Do NF calibration after DC offset and other CALs. 220 * Per system engineers, noise floor value can sometimes be 20 dB 221 * higher than normal value if DC offset and noise floor cal are 222 * triggered at the same time. 223 */ 224 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 225 /* 226 * Try to make sure the above NF cal completes, just so 227 * it doesn't clash with subsequent percals -adrian 228 */ 229 if (! ar5212WaitNFCalComplete(ah, 10000)) { 230 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: initial NF calibration did " 231 "not complete in time; noisy environment?\n", __func__); 232 return AH_FALSE; 233 } 234 235 /* Initialize list pointers */ 236 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL; 237 238 /* 239 * Enable IQ, ADC Gain, ADC DC Offset Cals 240 */ 241 if (AR_SREV_SOWL_10_OR_LATER(ah)) { 242 /* Setup all non-periodic, init time only calibrations */ 243 /* XXX: Init DC Offset not working yet */ 244#if 0 245 if (ar5416IsCalSupp(ah, chan, ADC_DC_INIT_CAL)) { 246 INIT_CAL(&cal->adcDcCalInitData); 247 INSERT_CAL(cal, &cal->adcDcCalInitData); 248 } 249 /* Initialize current pointer to first element in list */ 250 cal->cal_curr = cal->cal_list; 251 252 if (cal->ah_cal_curr != AH_NULL && !ar5416RunInitCals(ah, 0)) 253 return AH_FALSE; 254#endif 255 } 256 257 /* If Cals are supported, add them to list via INIT/INSERT_CAL */ 258 if (ar5416IsCalSupp(ah, chan, ADC_GAIN_CAL)) { 259 INIT_CAL(&cal->adcGainCalData); 260 INSERT_CAL(cal, &cal->adcGainCalData); 261 HALDEBUG(ah, HAL_DEBUG_PERCAL, 262 "%s: enable ADC Gain Calibration.\n", __func__); 263 } 264 if (ar5416IsCalSupp(ah, chan, ADC_DC_CAL)) { 265 INIT_CAL(&cal->adcDcCalData); 266 INSERT_CAL(cal, &cal->adcDcCalData); 267 HALDEBUG(ah, HAL_DEBUG_PERCAL, 268 "%s: enable ADC DC Calibration.\n", __func__); 269 } 270 if (ar5416IsCalSupp(ah, chan, IQ_MISMATCH_CAL)) { 271 INIT_CAL(&cal->iqCalData); 272 INSERT_CAL(cal, &cal->iqCalData); 273 HALDEBUG(ah, HAL_DEBUG_PERCAL, 274 "%s: enable IQ Calibration.\n", __func__); 275 } 276 /* Initialize current pointer to first element in list */ 277 cal->cal_curr = cal->cal_list; 278 279 /* Kick off measurements for the first cal */ 280 if (cal->cal_curr != AH_NULL) 281 ar5416ResetMeasurement(ah, cal->cal_curr); 282 283 /* Mark all calibrations on this channel as being invalid */ 284 ichan->calValid = 0; 285 286 return AH_TRUE; 287} 288 289/* 290 * Entry point for upper layers to restart current cal. 291 * Reset the calibration valid bit in channel. 292 */ 293HAL_BOOL 294ar5416ResetCalValid(struct ath_hal *ah, const struct ieee80211_channel *chan) 295{ 296 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 297 HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan); 298 HAL_CAL_LIST *currCal = cal->cal_curr; 299 300 if (!AR_SREV_SOWL_10_OR_LATER(ah)) 301 return AH_FALSE; 302 if (currCal == AH_NULL) 303 return AH_FALSE; 304 if (ichan == AH_NULL) { 305 HALDEBUG(ah, HAL_DEBUG_ANY, 306 "%s: invalid channel %u/0x%x; no mapping\n", 307 __func__, chan->ic_freq, chan->ic_flags); 308 return AH_FALSE; 309 } 310 /* 311 * Expected that this calibration has run before, post-reset. 312 * Current state should be done 313 */ 314 if (currCal->calState != CAL_DONE) { 315 HALDEBUG(ah, HAL_DEBUG_ANY, 316 "%s: Calibration state incorrect, %d\n", 317 __func__, currCal->calState); 318 return AH_FALSE; 319 } 320 321 /* Verify Cal is supported on this channel */ 322 if (!ar5416IsCalSupp(ah, chan, currCal->calData->calType)) 323 return AH_FALSE; 324 325 HALDEBUG(ah, HAL_DEBUG_PERCAL, 326 "%s: Resetting Cal %d state for channel %u/0x%x\n", 327 __func__, currCal->calData->calType, chan->ic_freq, 328 chan->ic_flags); 329 330 /* Disable cal validity in channel */ 331 ichan->calValid &= ~currCal->calData->calType; 332 currCal->calState = CAL_WAITING; 333 334 return AH_TRUE; 335} 336 337/* 338 * Recalibrate the lower PHY chips to account for temperature/environment 339 * changes. 340 */ 341static void 342ar5416DoCalibration(struct ath_hal *ah, HAL_CHANNEL_INTERNAL *ichan, 343 uint8_t rxchainmask, HAL_CAL_LIST *currCal, HAL_BOOL *isCalDone) 344{ 345 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 346 347 /* Cal is assumed not done until explicitly set below */ 348 *isCalDone = AH_FALSE; 349 350 HALDEBUG(ah, HAL_DEBUG_PERCAL, 351 "%s: %s Calibration, state %d, calValid 0x%x\n", 352 __func__, currCal->calData->calName, currCal->calState, 353 ichan->calValid); 354 355 /* Calibration in progress. */ 356 if (currCal->calState == CAL_RUNNING) { 357 /* Check to see if it has finished. */ 358 if (!(OS_REG_READ(ah, AR_PHY_TIMING_CTRL4) & AR_PHY_TIMING_CTRL4_DO_CAL)) { 359 HALDEBUG(ah, HAL_DEBUG_PERCAL, 360 "%s: sample %d of %d finished\n", 361 __func__, cal->calSamples, 362 currCal->calData->calNumSamples); 363 /* 364 * Collect measurements for active chains. 365 */ 366 currCal->calData->calCollect(ah); 367 if (++cal->calSamples >= currCal->calData->calNumSamples) { 368 int i, numChains = 0; 369 for (i = 0; i < AR5416_MAX_CHAINS; i++) { 370 if (rxchainmask & (1 << i)) 371 numChains++; 372 } 373 /* 374 * Process accumulated data 375 */ 376 currCal->calData->calPostProc(ah, numChains); 377 378 /* Calibration has finished. */ 379 ichan->calValid |= currCal->calData->calType; 380 currCal->calState = CAL_DONE; 381 *isCalDone = AH_TRUE; 382 } else { 383 /* 384 * Set-up to collect of another sub-sample. 385 */ 386 ar5416SetupMeasurement(ah, currCal); 387 } 388 } 389 } else if (!(ichan->calValid & currCal->calData->calType)) { 390 /* If current cal is marked invalid in channel, kick it off */ 391 ar5416ResetMeasurement(ah, currCal); 392 } 393} 394 395/* 396 * Internal interface to schedule periodic calibration work. 397 */ 398HAL_BOOL 399ar5416PerCalibrationN(struct ath_hal *ah, struct ieee80211_channel *chan, 400 u_int rxchainmask, HAL_BOOL longcal, HAL_BOOL *isCalDone) 401{ 402 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 403 HAL_CAL_LIST *currCal = cal->cal_curr; 404 HAL_CHANNEL_INTERNAL *ichan; 405 406 OS_MARK(ah, AH_MARK_PERCAL, chan->ic_freq); 407 408 *isCalDone = AH_TRUE; 409 410 /* 411 * Since ath_hal calls the PerCal method with rxchainmask=0x1; 412 * override it with the current chainmask. The upper levels currently 413 * doesn't know about the chainmask. 414 */ 415 rxchainmask = AH5416(ah)->ah_rx_chainmask; 416 417 /* Invalid channel check */ 418 ichan = ath_hal_checkchannel(ah, chan); 419 if (ichan == AH_NULL) { 420 HALDEBUG(ah, HAL_DEBUG_ANY, 421 "%s: invalid channel %u/0x%x; no mapping\n", 422 __func__, chan->ic_freq, chan->ic_flags); 423 return AH_FALSE; 424 } 425 426 /* 427 * For given calibration: 428 * 1. Call generic cal routine 429 * 2. When this cal is done (isCalDone) if we have more cals waiting 430 * (eg after reset), mask this to upper layers by not propagating 431 * isCalDone if it is set to TRUE. 432 * Instead, change isCalDone to FALSE and setup the waiting cal(s) 433 * to be run. 434 */ 435 if (currCal != AH_NULL && 436 (currCal->calState == CAL_RUNNING || 437 currCal->calState == CAL_WAITING)) { 438 ar5416DoCalibration(ah, ichan, rxchainmask, currCal, isCalDone); 439 if (*isCalDone == AH_TRUE) { 440 cal->cal_curr = currCal = currCal->calNext; 441 if (currCal->calState == CAL_WAITING) { 442 *isCalDone = AH_FALSE; 443 ar5416ResetMeasurement(ah, currCal); 444 } 445 } 446 } 447 448 /* Do NF cal only at longer intervals */ 449 if (longcal) { 450 /* 451 * Get the value from the previous NF cal 452 * and update the history buffer. 453 */ 454 ar5416GetNf(ah, chan); 455 456 /* 457 * Load the NF from history buffer of the current channel. 458 * NF is slow time-variant, so it is OK to use a 459 * historical value. 460 */ 461 ar5416LoadNF(ah, AH_PRIVATE(ah)->ah_curchan); 462 463 /* start NF calibration, without updating BB NF register*/ 464 ar5416StartNFCal(ah); 465 } 466 return AH_TRUE; 467} 468 469/* 470 * Recalibrate the lower PHY chips to account for temperature/environment 471 * changes. 472 */ 473HAL_BOOL 474ar5416PerCalibration(struct ath_hal *ah, struct ieee80211_channel *chan, 475 HAL_BOOL *isIQdone) 476{ 477 struct ath_hal_5416 *ahp = AH5416(ah); 478 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 479 HAL_CAL_LIST *curCal = cal->cal_curr; 480 481 if (curCal != AH_NULL && curCal->calData->calType == IQ_MISMATCH_CAL) { 482 return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask, 483 AH_TRUE, isIQdone); 484 } else { 485 HAL_BOOL isCalDone; 486 487 *isIQdone = AH_FALSE; 488 return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask, 489 AH_TRUE, &isCalDone); 490 } 491} 492 493static HAL_BOOL 494ar5416GetEepromNoiseFloorThresh(struct ath_hal *ah, 495 const struct ieee80211_channel *chan, int16_t *nft) 496{ 497 if (IEEE80211_IS_CHAN_5GHZ(chan)) { 498 ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_5, nft); 499 return AH_TRUE; 500 } 501 if (IEEE80211_IS_CHAN_2GHZ(chan)) { 502 ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_2, nft); 503 return AH_TRUE; 504 } 505 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: invalid channel flags 0x%x\n", 506 __func__, chan->ic_flags); 507 return AH_FALSE; 508} 509 510static void 511ar5416StartNFCal(struct ath_hal *ah) 512{ 513 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF); 514 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 515 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 516} 517 518static void 519ar5416LoadNF(struct ath_hal *ah, const struct ieee80211_channel *chan) 520{ 521 static const uint32_t ar5416_cca_regs[] = { 522 AR_PHY_CCA, 523 AR_PHY_CH1_CCA, 524 AR_PHY_CH2_CCA, 525 AR_PHY_EXT_CCA, 526 AR_PHY_CH1_EXT_CCA, 527 AR_PHY_CH2_EXT_CCA 528 }; 529 struct ar5212NfCalHist *h; 530 int i; 531 int32_t val; 532 uint8_t chainmask; 533 534 /* 535 * Force NF calibration for all chains. 536 */ 537 if (AR_SREV_KITE(ah)) { 538 /* Kite has only one chain */ 539 chainmask = 0x9; 540 } else if (AR_SREV_MERLIN(ah)) { 541 /* Merlin has only two chains */ 542 chainmask = 0x1B; 543 } else { 544 chainmask = 0x3F; 545 } 546 547 /* 548 * Write filtered NF values into maxCCApwr register parameter 549 * so we can load below. 550 */ 551 h = AH5416(ah)->ah_cal.nfCalHist; 552 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) 553 if (chainmask & (1 << i)) { 554 val = OS_REG_READ(ah, ar5416_cca_regs[i]); 555 val &= 0xFFFFFE00; 556 val |= (((uint32_t)(h[i].privNF) << 1) & 0x1ff); 557 OS_REG_WRITE(ah, ar5416_cca_regs[i], val); 558 } 559 560 /* Load software filtered NF value into baseband internal minCCApwr variable. */ 561 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF); 562 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 563 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 564 565 if (! ar5212WaitNFCalComplete(ah, 1000)) { 566 /* 567 * We timed out waiting for the noisefloor to load, probably due to an 568 * in-progress rx. Simply return here and allow the load plenty of time 569 * to complete before the next calibration interval. We need to avoid 570 * trying to load -50 (which happens below) while the previous load is 571 * still in progress as this can cause rx deafness. Instead by returning 572 * here, the baseband nf cal will just be capped by our present 573 * noisefloor until the next calibration timer. 574 */ 575 HALDEBUG(ah, HAL_DEBUG_ANY, "Timeout while waiting for nf " 576 "to load: AR_PHY_AGC_CONTROL=0x%x\n", 577 OS_REG_READ(ah, AR_PHY_AGC_CONTROL)); 578 return; 579 } 580 581 /* 582 * Restore maxCCAPower register parameter again so that we're not capped 583 * by the median we just loaded. This will be initial (and max) value 584 * of next noise floor calibration the baseband does. 585 */ 586 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) 587 if (chainmask & (1 << i)) { 588 val = OS_REG_READ(ah, ar5416_cca_regs[i]); 589 val &= 0xFFFFFE00; 590 val |= (((uint32_t)(-50) << 1) & 0x1ff); 591 OS_REG_WRITE(ah, ar5416_cca_regs[i], val); 592 } 593} 594 595void 596ar5416InitNfHistBuff(struct ar5212NfCalHist *h) 597{ 598 int i, j; 599 600 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 601 h[i].currIndex = 0; 602 h[i].privNF = AR5416_CCA_MAX_GOOD_VALUE; 603 h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX; 604 for (j = 0; j < AR512_NF_CAL_HIST_MAX; j ++) 605 h[i].nfCalBuffer[j] = AR5416_CCA_MAX_GOOD_VALUE; 606 } 607} 608 609/* 610 * Update the noise floor buffer as a ring buffer 611 */ 612static void 613ar5416UpdateNFHistBuff(struct ar5212NfCalHist *h, int16_t *nfarray) 614{ 615 int i; 616 617 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 618 h[i].nfCalBuffer[h[i].currIndex] = nfarray[i]; 619 620 if (++h[i].currIndex >= AR512_NF_CAL_HIST_MAX) 621 h[i].currIndex = 0; 622 if (h[i].invalidNFcount > 0) { 623 if (nfarray[i] < AR5416_CCA_MIN_BAD_VALUE || 624 nfarray[i] > AR5416_CCA_MAX_HIGH_VALUE) { 625 h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX; 626 } else { 627 h[i].invalidNFcount--; 628 h[i].privNF = nfarray[i]; 629 } 630 } else { 631 h[i].privNF = ar5212GetNfHistMid(h[i].nfCalBuffer); 632 } 633 } 634} 635 636/* 637 * Read the NF and check it against the noise floor threshhold 638 */ 639static int16_t 640ar5416GetNf(struct ath_hal *ah, struct ieee80211_channel *chan) 641{ 642 int16_t nf, nfThresh; 643 644 if (ar5212IsNFCalInProgress(ah)) { 645 HALDEBUG(ah, HAL_DEBUG_ANY, 646 "%s: NF didn't complete in calibration window\n", __func__); 647 nf = 0; 648 } else { 649 /* Finished NF cal, check against threshold */ 650 int16_t nfarray[NUM_NOISEFLOOR_READINGS] = { 0 }; 651 HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan); 652 653 /* TODO - enhance for multiple chains and ext ch */ 654 ath_hal_getNoiseFloor(ah, nfarray); 655 nf = nfarray[0]; 656 if (ar5416GetEepromNoiseFloorThresh(ah, chan, &nfThresh)) { 657 if (nf > nfThresh) { 658 HALDEBUG(ah, HAL_DEBUG_ANY, 659 "%s: noise floor failed detected; " 660 "detected %d, threshold %d\n", __func__, 661 nf, nfThresh); 662 /* 663 * NB: Don't discriminate 2.4 vs 5Ghz, if this 664 * happens it indicates a problem regardless 665 * of the band. 666 */ 667 chan->ic_state |= IEEE80211_CHANSTATE_CWINT; 668 nf = 0; 669 } 670 } else { 671 nf = 0; 672 } 673 ar5416UpdateNFHistBuff(AH5416(ah)->ah_cal.nfCalHist, nfarray); 674 ichan->rawNoiseFloor = nf; 675 } 676 return nf; 677} 678