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 * $FreeBSD$ 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 36 static void ar5416StartNFCal(struct ath_hal *ah); 37 static void ar5416LoadNF(struct ath_hal *ah, const struct ieee80211_channel *); 38 static int16_t ar5416GetNf(struct ath_hal *, struct ieee80211_channel *); 39 40 /* 41 * Determine if calibration is supported by device and channel flags 42 */ 43 static OS_INLINE HAL_BOOL 44 ar5416IsCalSupp(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 */ 65 static void 66 ar5416SetupMeasurement(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 */ 103 static void 104 ar5416ResetMeasurement(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 */ 123 static HAL_BOOL 124 ar5416RunInitCals(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 */ 169 HAL_BOOL 170 ar5416InitCal(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 /* XXX this actually kicks off a NF calibration -adrian */ 225 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 226 /* 227 * Try to make sure the above NF cal completes, just so 228 * it doesn't clash with subsequent percals -adrian 229 */ 230 if (! ar5212WaitNFCalComplete(ah, 10000)) { 231 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: initial NF calibration did " 232 "not complete in time; noisy environment?\n", __func__); 233 return AH_FALSE; 234 } 235 236 /* Initialize list pointers */ 237 cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL; 238 239 /* 240 * Enable IQ, ADC Gain, ADC DC Offset Cals 241 */ 242 if (AR_SREV_SOWL_10_OR_LATER(ah)) { 243 /* Setup all non-periodic, init time only calibrations */ 244 /* XXX: Init DC Offset not working yet */ 245 #if 0 246 if (ar5416IsCalSupp(ah, chan, ADC_DC_INIT_CAL)) { 247 INIT_CAL(&cal->adcDcCalInitData); 248 INSERT_CAL(cal, &cal->adcDcCalInitData); 249 } 250 /* Initialize current pointer to first element in list */ 251 cal->cal_curr = cal->cal_list; 252 253 if (cal->ah_cal_curr != AH_NULL && !ar5416RunInitCals(ah, 0)) 254 return AH_FALSE; 255 #endif 256 } 257 258 /* If Cals are supported, add them to list via INIT/INSERT_CAL */ 259 if (ar5416IsCalSupp(ah, chan, ADC_GAIN_CAL)) { 260 INIT_CAL(&cal->adcGainCalData); 261 INSERT_CAL(cal, &cal->adcGainCalData); 262 HALDEBUG(ah, HAL_DEBUG_PERCAL, 263 "%s: enable ADC Gain Calibration.\n", __func__); 264 } 265 if (ar5416IsCalSupp(ah, chan, ADC_DC_CAL)) { 266 INIT_CAL(&cal->adcDcCalData); 267 INSERT_CAL(cal, &cal->adcDcCalData); 268 HALDEBUG(ah, HAL_DEBUG_PERCAL, 269 "%s: enable ADC DC Calibration.\n", __func__); 270 } 271 if (ar5416IsCalSupp(ah, chan, IQ_MISMATCH_CAL)) { 272 INIT_CAL(&cal->iqCalData); 273 INSERT_CAL(cal, &cal->iqCalData); 274 HALDEBUG(ah, HAL_DEBUG_PERCAL, 275 "%s: enable IQ Calibration.\n", __func__); 276 } 277 /* Initialize current pointer to first element in list */ 278 cal->cal_curr = cal->cal_list; 279 280 /* Kick off measurements for the first cal */ 281 if (cal->cal_curr != AH_NULL) 282 ar5416ResetMeasurement(ah, cal->cal_curr); 283 284 /* Mark all calibrations on this channel as being invalid */ 285 ichan->calValid = 0; 286 287 return AH_TRUE; 288 } 289 290 /* 291 * Entry point for upper layers to restart current cal. 292 * Reset the calibration valid bit in channel. 293 */ 294 HAL_BOOL 295 ar5416ResetCalValid(struct ath_hal *ah, const struct ieee80211_channel *chan) 296 { 297 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 298 HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan); 299 HAL_CAL_LIST *currCal = cal->cal_curr; 300 301 if (!AR_SREV_SOWL_10_OR_LATER(ah)) 302 return AH_FALSE; 303 if (currCal == AH_NULL) 304 return AH_FALSE; 305 if (ichan == AH_NULL) { 306 HALDEBUG(ah, HAL_DEBUG_ANY, 307 "%s: invalid channel %u/0x%x; no mapping\n", 308 __func__, chan->ic_freq, chan->ic_flags); 309 return AH_FALSE; 310 } 311 /* 312 * Expected that this calibration has run before, post-reset. 313 * Current state should be done 314 */ 315 if (currCal->calState != CAL_DONE) { 316 HALDEBUG(ah, HAL_DEBUG_ANY, 317 "%s: Calibration state incorrect, %d\n", 318 __func__, currCal->calState); 319 return AH_FALSE; 320 } 321 322 /* Verify Cal is supported on this channel */ 323 if (!ar5416IsCalSupp(ah, chan, currCal->calData->calType)) 324 return AH_FALSE; 325 326 HALDEBUG(ah, HAL_DEBUG_PERCAL, 327 "%s: Resetting Cal %d state for channel %u/0x%x\n", 328 __func__, currCal->calData->calType, chan->ic_freq, 329 chan->ic_flags); 330 331 /* Disable cal validity in channel */ 332 ichan->calValid &= ~currCal->calData->calType; 333 currCal->calState = CAL_WAITING; 334 335 return AH_TRUE; 336 } 337 338 /* 339 * Recalibrate the lower PHY chips to account for temperature/environment 340 * changes. 341 */ 342 static void 343 ar5416DoCalibration(struct ath_hal *ah, HAL_CHANNEL_INTERNAL *ichan, 344 uint8_t rxchainmask, HAL_CAL_LIST *currCal, HAL_BOOL *isCalDone) 345 { 346 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 347 348 /* Cal is assumed not done until explicitly set below */ 349 *isCalDone = AH_FALSE; 350 351 HALDEBUG(ah, HAL_DEBUG_PERCAL, 352 "%s: %s Calibration, state %d, calValid 0x%x\n", 353 __func__, currCal->calData->calName, currCal->calState, 354 ichan->calValid); 355 356 /* Calibration in progress. */ 357 if (currCal->calState == CAL_RUNNING) { 358 /* Check to see if it has finished. */ 359 if (!(OS_REG_READ(ah, AR_PHY_TIMING_CTRL4) & AR_PHY_TIMING_CTRL4_DO_CAL)) { 360 HALDEBUG(ah, HAL_DEBUG_PERCAL, 361 "%s: sample %d of %d finished\n", 362 __func__, cal->calSamples, 363 currCal->calData->calNumSamples); 364 /* 365 * Collect measurements for active chains. 366 */ 367 currCal->calData->calCollect(ah); 368 if (++cal->calSamples >= currCal->calData->calNumSamples) { 369 int i, numChains = 0; 370 for (i = 0; i < AR5416_MAX_CHAINS; i++) { 371 if (rxchainmask & (1 << i)) 372 numChains++; 373 } 374 /* 375 * Process accumulated data 376 */ 377 currCal->calData->calPostProc(ah, numChains); 378 379 /* Calibration has finished. */ 380 ichan->calValid |= currCal->calData->calType; 381 currCal->calState = CAL_DONE; 382 *isCalDone = AH_TRUE; 383 } else { 384 /* 385 * Set-up to collect of another sub-sample. 386 */ 387 ar5416SetupMeasurement(ah, currCal); 388 } 389 } 390 } else if (!(ichan->calValid & currCal->calData->calType)) { 391 /* If current cal is marked invalid in channel, kick it off */ 392 ar5416ResetMeasurement(ah, currCal); 393 } 394 } 395 396 /* 397 * Internal interface to schedule periodic calibration work. 398 */ 399 HAL_BOOL 400 ar5416PerCalibrationN(struct ath_hal *ah, struct ieee80211_channel *chan, 401 u_int rxchainmask, HAL_BOOL longcal, HAL_BOOL *isCalDone) 402 { 403 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 404 HAL_CAL_LIST *currCal = cal->cal_curr; 405 HAL_CHANNEL_INTERNAL *ichan; 406 407 OS_MARK(ah, AH_MARK_PERCAL, chan->ic_freq); 408 409 *isCalDone = AH_TRUE; 410 411 /* 412 * Since ath_hal calls the PerCal method with rxchainmask=0x1; 413 * override it with the current chainmask. The upper levels currently 414 * doesn't know about the chainmask. 415 */ 416 rxchainmask = AH5416(ah)->ah_rx_chainmask; 417 418 /* Invalid channel check */ 419 ichan = ath_hal_checkchannel(ah, chan); 420 if (ichan == AH_NULL) { 421 HALDEBUG(ah, HAL_DEBUG_ANY, 422 "%s: invalid channel %u/0x%x; no mapping\n", 423 __func__, chan->ic_freq, chan->ic_flags); 424 return AH_FALSE; 425 } 426 427 /* 428 * For given calibration: 429 * 1. Call generic cal routine 430 * 2. When this cal is done (isCalDone) if we have more cals waiting 431 * (eg after reset), mask this to upper layers by not propagating 432 * isCalDone if it is set to TRUE. 433 * Instead, change isCalDone to FALSE and setup the waiting cal(s) 434 * to be run. 435 */ 436 if (currCal != AH_NULL && 437 (currCal->calState == CAL_RUNNING || 438 currCal->calState == CAL_WAITING)) { 439 ar5416DoCalibration(ah, ichan, rxchainmask, currCal, isCalDone); 440 if (*isCalDone == AH_TRUE) { 441 cal->cal_curr = currCal = currCal->calNext; 442 if (currCal->calState == CAL_WAITING) { 443 *isCalDone = AH_FALSE; 444 ar5416ResetMeasurement(ah, currCal); 445 } 446 } 447 } 448 449 /* Do NF cal only at longer intervals */ 450 if (longcal) { 451 /* 452 * Get the value from the previous NF cal 453 * and update the history buffer. 454 */ 455 ar5416GetNf(ah, chan); 456 457 /* 458 * Load the NF from history buffer of the current channel. 459 * NF is slow time-variant, so it is OK to use a 460 * historical value. 461 */ 462 ar5416LoadNF(ah, AH_PRIVATE(ah)->ah_curchan); 463 464 /* start NF calibration, without updating BB NF register*/ 465 ar5416StartNFCal(ah); 466 } 467 return AH_TRUE; 468 } 469 470 /* 471 * Recalibrate the lower PHY chips to account for temperature/environment 472 * changes. 473 */ 474 HAL_BOOL 475 ar5416PerCalibration(struct ath_hal *ah, struct ieee80211_channel *chan, 476 HAL_BOOL *isIQdone) 477 { 478 struct ath_hal_5416 *ahp = AH5416(ah); 479 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 480 HAL_CAL_LIST *curCal = cal->cal_curr; 481 482 if (curCal != AH_NULL && curCal->calData->calType == IQ_MISMATCH_CAL) { 483 return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask, 484 AH_TRUE, isIQdone); 485 } else { 486 HAL_BOOL isCalDone; 487 488 *isIQdone = AH_FALSE; 489 return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask, 490 AH_TRUE, &isCalDone); 491 } 492 } 493 494 static HAL_BOOL 495 ar5416GetEepromNoiseFloorThresh(struct ath_hal *ah, 496 const struct ieee80211_channel *chan, int16_t *nft) 497 { 498 if (IEEE80211_IS_CHAN_5GHZ(chan)) { 499 ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_5, nft); 500 return AH_TRUE; 501 } 502 if (IEEE80211_IS_CHAN_2GHZ(chan)) { 503 ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_2, nft); 504 return AH_TRUE; 505 } 506 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: invalid channel flags 0x%x\n", 507 __func__, chan->ic_flags); 508 return AH_FALSE; 509 } 510 511 static void 512 ar5416StartNFCal(struct ath_hal *ah) 513 { 514 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF); 515 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 516 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 517 } 518 519 static void 520 ar5416LoadNF(struct ath_hal *ah, const struct ieee80211_channel *chan) 521 { 522 static const uint32_t ar5416_cca_regs[] = { 523 AR_PHY_CCA, 524 AR_PHY_CH1_CCA, 525 AR_PHY_CH2_CCA, 526 AR_PHY_EXT_CCA, 527 AR_PHY_CH1_EXT_CCA, 528 AR_PHY_CH2_EXT_CCA 529 }; 530 struct ar5212NfCalHist *h; 531 int i; 532 int32_t val; 533 uint8_t chainmask; 534 535 /* 536 * Force NF calibration for all chains. 537 */ 538 if (AR_SREV_KITE(ah)) { 539 /* Kite has only one chain */ 540 chainmask = 0x9; 541 } else if (AR_SREV_MERLIN(ah)) { 542 /* Merlin has only two chains */ 543 chainmask = 0x1B; 544 } else { 545 chainmask = 0x3F; 546 } 547 548 /* 549 * Write filtered NF values into maxCCApwr register parameter 550 * so we can load below. 551 */ 552 h = AH5416(ah)->ah_cal.nfCalHist; 553 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) 554 if (chainmask & (1 << i)) { 555 val = OS_REG_READ(ah, ar5416_cca_regs[i]); 556 val &= 0xFFFFFE00; 557 val |= (((uint32_t)(h[i].privNF) << 1) & 0x1ff); 558 OS_REG_WRITE(ah, ar5416_cca_regs[i], val); 559 } 560 561 /* Load software filtered NF value into baseband internal minCCApwr variable. */ 562 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF); 563 OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 564 OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 565 566 /* Wait for load to complete, should be fast, a few 10s of us. */ 567 if (! ar5212WaitNFCalComplete(ah, 1000)) { 568 /* 569 * We timed out waiting for the noisefloor to load, probably due to an 570 * in-progress rx. Simply return here and allow the load plenty of time 571 * to complete before the next calibration interval. We need to avoid 572 * trying to load -50 (which happens below) while the previous load is 573 * still in progress as this can cause rx deafness. Instead by returning 574 * here, the baseband nf cal will just be capped by our present 575 * noisefloor until the next calibration timer. 576 */ 577 HALDEBUG(ah, HAL_DEBUG_ANY, "Timeout while waiting for nf " 578 "to load: AR_PHY_AGC_CONTROL=0x%x\n", 579 OS_REG_READ(ah, AR_PHY_AGC_CONTROL)); 580 return; 581 } 582 583 /* 584 * Restore maxCCAPower register parameter again so that we're not capped 585 * by the median we just loaded. This will be initial (and max) value 586 * of next noise floor calibration the baseband does. 587 */ 588 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) 589 if (chainmask & (1 << i)) { 590 val = OS_REG_READ(ah, ar5416_cca_regs[i]); 591 val &= 0xFFFFFE00; 592 val |= (((uint32_t)(-50) << 1) & 0x1ff); 593 OS_REG_WRITE(ah, ar5416_cca_regs[i], val); 594 } 595 } 596 597 void 598 ar5416InitNfHistBuff(struct ar5212NfCalHist *h) 599 { 600 int i, j; 601 602 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 603 h[i].currIndex = 0; 604 h[i].privNF = AR5416_CCA_MAX_GOOD_VALUE; 605 h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX; 606 for (j = 0; j < AR512_NF_CAL_HIST_MAX; j ++) 607 h[i].nfCalBuffer[j] = AR5416_CCA_MAX_GOOD_VALUE; 608 } 609 } 610 611 /* 612 * Update the noise floor buffer as a ring buffer 613 */ 614 static void 615 ar5416UpdateNFHistBuff(struct ar5212NfCalHist *h, int16_t *nfarray) 616 { 617 int i; 618 619 for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) { 620 h[i].nfCalBuffer[h[i].currIndex] = nfarray[i]; 621 622 if (++h[i].currIndex >= AR512_NF_CAL_HIST_MAX) 623 h[i].currIndex = 0; 624 if (h[i].invalidNFcount > 0) { 625 if (nfarray[i] < AR5416_CCA_MIN_BAD_VALUE || 626 nfarray[i] > AR5416_CCA_MAX_HIGH_VALUE) { 627 h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX; 628 } else { 629 h[i].invalidNFcount--; 630 h[i].privNF = nfarray[i]; 631 } 632 } else { 633 h[i].privNF = ar5212GetNfHistMid(h[i].nfCalBuffer); 634 } 635 } 636 } 637 638 /* 639 * Read the NF and check it against the noise floor threshhold 640 */ 641 static int16_t 642 ar5416GetNf(struct ath_hal *ah, struct ieee80211_channel *chan) 643 { 644 int16_t nf, nfThresh; 645 646 if (ar5212IsNFCalInProgress(ah)) { 647 HALDEBUG(ah, HAL_DEBUG_ANY, 648 "%s: NF didn't complete in calibration window\n", __func__); 649 nf = 0; 650 } else { 651 /* Finished NF cal, check against threshold */ 652 int16_t nfarray[NUM_NOISEFLOOR_READINGS] = { 0 }; 653 HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan); 654 655 /* TODO - enhance for multiple chains and ext ch */ 656 ath_hal_getNoiseFloor(ah, nfarray); 657 nf = nfarray[0]; 658 if (ar5416GetEepromNoiseFloorThresh(ah, chan, &nfThresh)) { 659 if (nf > nfThresh) { 660 HALDEBUG(ah, HAL_DEBUG_ANY, 661 "%s: noise floor failed detected; " 662 "detected %d, threshold %d\n", __func__, 663 nf, nfThresh); 664 /* 665 * NB: Don't discriminate 2.4 vs 5Ghz, if this 666 * happens it indicates a problem regardless 667 * of the band. 668 */ 669 chan->ic_state |= IEEE80211_CHANSTATE_CWINT; 670 nf = 0; 671 } 672 } else { 673 nf = 0; 674 } 675 ar5416UpdateNFHistBuff(AH5416(ah)->ah_cal.nfCalHist, nfarray); 676 ichan->rawNoiseFloor = nf; 677 } 678 return nf; 679 } 680