1 /* 2 * Copyright (c) 2008-2011 Atheros Communications Inc. 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 #include "hw.h" 18 #include "hw-ops.h" 19 #include <linux/export.h> 20 21 /* Common calibration code */ 22 23 24 static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer) 25 { 26 int16_t nfval; 27 int16_t sort[ATH9K_NF_CAL_HIST_MAX]; 28 int i, j; 29 30 for (i = 0; i < ATH9K_NF_CAL_HIST_MAX; i++) 31 sort[i] = nfCalBuffer[i]; 32 33 for (i = 0; i < ATH9K_NF_CAL_HIST_MAX - 1; i++) { 34 for (j = 1; j < ATH9K_NF_CAL_HIST_MAX - i; j++) { 35 if (sort[j] > sort[j - 1]) { 36 nfval = sort[j]; 37 sort[j] = sort[j - 1]; 38 sort[j - 1] = nfval; 39 } 40 } 41 } 42 nfval = sort[(ATH9K_NF_CAL_HIST_MAX - 1) >> 1]; 43 44 return nfval; 45 } 46 47 static struct ath_nf_limits *ath9k_hw_get_nf_limits(struct ath_hw *ah, 48 struct ath9k_channel *chan) 49 { 50 struct ath_nf_limits *limit; 51 52 if (!chan || IS_CHAN_2GHZ(chan)) 53 limit = &ah->nf_2g; 54 else 55 limit = &ah->nf_5g; 56 57 return limit; 58 } 59 60 static s16 ath9k_hw_get_default_nf(struct ath_hw *ah, 61 struct ath9k_channel *chan) 62 { 63 return ath9k_hw_get_nf_limits(ah, chan)->nominal; 64 } 65 66 s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan) 67 { 68 s8 noise = ATH_DEFAULT_NOISE_FLOOR; 69 70 if (chan && chan->noisefloor) { 71 s8 delta = chan->noisefloor - 72 ATH9K_NF_CAL_NOISE_THRESH - 73 ath9k_hw_get_default_nf(ah, chan); 74 if (delta > 0) 75 noise += delta; 76 } 77 return noise; 78 } 79 EXPORT_SYMBOL(ath9k_hw_getchan_noise); 80 81 static void ath9k_hw_update_nfcal_hist_buffer(struct ath_hw *ah, 82 struct ath9k_hw_cal_data *cal, 83 int16_t *nfarray) 84 { 85 struct ath_common *common = ath9k_hw_common(ah); 86 struct ath_nf_limits *limit; 87 struct ath9k_nfcal_hist *h; 88 bool high_nf_mid = false; 89 u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask; 90 int i; 91 92 h = cal->nfCalHist; 93 limit = ath9k_hw_get_nf_limits(ah, ah->curchan); 94 95 for (i = 0; i < NUM_NF_READINGS; i++) { 96 if (!(chainmask & (1 << i)) || 97 ((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(ah->curchan))) 98 continue; 99 100 h[i].nfCalBuffer[h[i].currIndex] = nfarray[i]; 101 102 if (++h[i].currIndex >= ATH9K_NF_CAL_HIST_MAX) 103 h[i].currIndex = 0; 104 105 if (h[i].invalidNFcount > 0) { 106 h[i].invalidNFcount--; 107 h[i].privNF = nfarray[i]; 108 } else { 109 h[i].privNF = 110 ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer); 111 } 112 113 if (!h[i].privNF) 114 continue; 115 116 if (h[i].privNF > limit->max) { 117 high_nf_mid = true; 118 119 ath_dbg(common, CALIBRATE, 120 "NFmid[%d] (%d) > MAX (%d), %s\n", 121 i, h[i].privNF, limit->max, 122 (cal->nfcal_interference ? 123 "not corrected (due to interference)" : 124 "correcting to MAX")); 125 126 /* 127 * Normally we limit the average noise floor by the 128 * hardware specific maximum here. However if we have 129 * encountered stuck beacons because of interference, 130 * we bypass this limit here in order to better deal 131 * with our environment. 132 */ 133 if (!cal->nfcal_interference) 134 h[i].privNF = limit->max; 135 } 136 } 137 138 /* 139 * If the noise floor seems normal for all chains, assume that 140 * there is no significant interference in the environment anymore. 141 * Re-enable the enforcement of the NF maximum again. 142 */ 143 if (!high_nf_mid) 144 cal->nfcal_interference = false; 145 } 146 147 static bool ath9k_hw_get_nf_thresh(struct ath_hw *ah, 148 enum ieee80211_band band, 149 int16_t *nft) 150 { 151 switch (band) { 152 case IEEE80211_BAND_5GHZ: 153 *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_5); 154 break; 155 case IEEE80211_BAND_2GHZ: 156 *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_2); 157 break; 158 default: 159 BUG_ON(1); 160 return false; 161 } 162 163 return true; 164 } 165 166 void ath9k_hw_reset_calibration(struct ath_hw *ah, 167 struct ath9k_cal_list *currCal) 168 { 169 int i; 170 171 ath9k_hw_setup_calibration(ah, currCal); 172 173 currCal->calState = CAL_RUNNING; 174 175 for (i = 0; i < AR5416_MAX_CHAINS; i++) { 176 ah->meas0.sign[i] = 0; 177 ah->meas1.sign[i] = 0; 178 ah->meas2.sign[i] = 0; 179 ah->meas3.sign[i] = 0; 180 } 181 182 ah->cal_samples = 0; 183 } 184 185 /* This is done for the currently configured channel */ 186 bool ath9k_hw_reset_calvalid(struct ath_hw *ah) 187 { 188 struct ath_common *common = ath9k_hw_common(ah); 189 struct ieee80211_conf *conf = &common->hw->conf; 190 struct ath9k_cal_list *currCal = ah->cal_list_curr; 191 192 if (!ah->caldata) 193 return true; 194 195 if (!AR_SREV_9100(ah) && !AR_SREV_9160_10_OR_LATER(ah)) 196 return true; 197 198 if (currCal == NULL) 199 return true; 200 201 if (currCal->calState != CAL_DONE) { 202 ath_dbg(common, CALIBRATE, "Calibration state incorrect, %d\n", 203 currCal->calState); 204 return true; 205 } 206 207 if (!(ah->supp_cals & currCal->calData->calType)) 208 return true; 209 210 ath_dbg(common, CALIBRATE, "Resetting Cal %d state for channel %u\n", 211 currCal->calData->calType, conf->chandef.chan->center_freq); 212 213 ah->caldata->CalValid &= ~currCal->calData->calType; 214 currCal->calState = CAL_WAITING; 215 216 return false; 217 } 218 EXPORT_SYMBOL(ath9k_hw_reset_calvalid); 219 220 void ath9k_hw_start_nfcal(struct ath_hw *ah, bool update) 221 { 222 if (ah->caldata) 223 ah->caldata->nfcal_pending = true; 224 225 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, 226 AR_PHY_AGC_CONTROL_ENABLE_NF); 227 228 if (update) 229 REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, 230 AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 231 else 232 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, 233 AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 234 235 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 236 } 237 238 void ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan) 239 { 240 struct ath9k_nfcal_hist *h = NULL; 241 unsigned i, j; 242 int32_t val; 243 u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask; 244 struct ath_common *common = ath9k_hw_common(ah); 245 struct ieee80211_conf *conf = &common->hw->conf; 246 s16 default_nf = ath9k_hw_get_default_nf(ah, chan); 247 248 if (ah->caldata) 249 h = ah->caldata->nfCalHist; 250 251 for (i = 0; i < NUM_NF_READINGS; i++) { 252 if (chainmask & (1 << i)) { 253 s16 nfval; 254 255 if ((i >= AR5416_MAX_CHAINS) && !conf_is_ht40(conf)) 256 continue; 257 258 if (h) 259 nfval = h[i].privNF; 260 else 261 nfval = default_nf; 262 263 val = REG_READ(ah, ah->nf_regs[i]); 264 val &= 0xFFFFFE00; 265 val |= (((u32) nfval << 1) & 0x1ff); 266 REG_WRITE(ah, ah->nf_regs[i], val); 267 } 268 } 269 270 /* 271 * Load software filtered NF value into baseband internal minCCApwr 272 * variable. 273 */ 274 REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, 275 AR_PHY_AGC_CONTROL_ENABLE_NF); 276 REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, 277 AR_PHY_AGC_CONTROL_NO_UPDATE_NF); 278 REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); 279 280 /* 281 * Wait for load to complete, should be fast, a few 10s of us. 282 * The max delay was changed from an original 250us to 10000us 283 * since 250us often results in NF load timeout and causes deaf 284 * condition during stress testing 12/12/2009 285 */ 286 for (j = 0; j < 10000; j++) { 287 if ((REG_READ(ah, AR_PHY_AGC_CONTROL) & 288 AR_PHY_AGC_CONTROL_NF) == 0) 289 break; 290 udelay(10); 291 } 292 293 /* 294 * We timed out waiting for the noisefloor to load, probably due to an 295 * in-progress rx. Simply return here and allow the load plenty of time 296 * to complete before the next calibration interval. We need to avoid 297 * trying to load -50 (which happens below) while the previous load is 298 * still in progress as this can cause rx deafness. Instead by returning 299 * here, the baseband nf cal will just be capped by our present 300 * noisefloor until the next calibration timer. 301 */ 302 if (j == 10000) { 303 ath_dbg(common, ANY, 304 "Timeout while waiting for nf to load: AR_PHY_AGC_CONTROL=0x%x\n", 305 REG_READ(ah, AR_PHY_AGC_CONTROL)); 306 return; 307 } 308 309 /* 310 * Restore maxCCAPower register parameter again so that we're not capped 311 * by the median we just loaded. This will be initial (and max) value 312 * of next noise floor calibration the baseband does. 313 */ 314 ENABLE_REGWRITE_BUFFER(ah); 315 for (i = 0; i < NUM_NF_READINGS; i++) { 316 if (chainmask & (1 << i)) { 317 if ((i >= AR5416_MAX_CHAINS) && !conf_is_ht40(conf)) 318 continue; 319 320 val = REG_READ(ah, ah->nf_regs[i]); 321 val &= 0xFFFFFE00; 322 val |= (((u32) (-50) << 1) & 0x1ff); 323 REG_WRITE(ah, ah->nf_regs[i], val); 324 } 325 } 326 REGWRITE_BUFFER_FLUSH(ah); 327 } 328 329 330 static void ath9k_hw_nf_sanitize(struct ath_hw *ah, s16 *nf) 331 { 332 struct ath_common *common = ath9k_hw_common(ah); 333 struct ath_nf_limits *limit; 334 int i; 335 336 if (IS_CHAN_2GHZ(ah->curchan)) 337 limit = &ah->nf_2g; 338 else 339 limit = &ah->nf_5g; 340 341 for (i = 0; i < NUM_NF_READINGS; i++) { 342 if (!nf[i]) 343 continue; 344 345 ath_dbg(common, CALIBRATE, 346 "NF calibrated [%s] [chain %d] is %d\n", 347 (i >= 3 ? "ext" : "ctl"), i % 3, nf[i]); 348 349 if (nf[i] > limit->max) { 350 ath_dbg(common, CALIBRATE, 351 "NF[%d] (%d) > MAX (%d), correcting to MAX\n", 352 i, nf[i], limit->max); 353 nf[i] = limit->max; 354 } else if (nf[i] < limit->min) { 355 ath_dbg(common, CALIBRATE, 356 "NF[%d] (%d) < MIN (%d), correcting to NOM\n", 357 i, nf[i], limit->min); 358 nf[i] = limit->nominal; 359 } 360 } 361 } 362 363 bool ath9k_hw_getnf(struct ath_hw *ah, struct ath9k_channel *chan) 364 { 365 struct ath_common *common = ath9k_hw_common(ah); 366 int16_t nf, nfThresh; 367 int16_t nfarray[NUM_NF_READINGS] = { 0 }; 368 struct ath9k_nfcal_hist *h; 369 struct ieee80211_channel *c = chan->chan; 370 struct ath9k_hw_cal_data *caldata = ah->caldata; 371 372 if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) { 373 ath_dbg(common, CALIBRATE, 374 "NF did not complete in calibration window\n"); 375 return false; 376 } 377 378 ath9k_hw_do_getnf(ah, nfarray); 379 ath9k_hw_nf_sanitize(ah, nfarray); 380 nf = nfarray[0]; 381 if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh) 382 && nf > nfThresh) { 383 ath_dbg(common, CALIBRATE, 384 "noise floor failed detected; detected %d, threshold %d\n", 385 nf, nfThresh); 386 } 387 388 if (!caldata) { 389 chan->noisefloor = nf; 390 ah->noise = ath9k_hw_getchan_noise(ah, chan); 391 return false; 392 } 393 394 h = caldata->nfCalHist; 395 caldata->nfcal_pending = false; 396 ath9k_hw_update_nfcal_hist_buffer(ah, caldata, nfarray); 397 chan->noisefloor = h[0].privNF; 398 ah->noise = ath9k_hw_getchan_noise(ah, chan); 399 return true; 400 } 401 EXPORT_SYMBOL(ath9k_hw_getnf); 402 403 void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah, 404 struct ath9k_channel *chan) 405 { 406 struct ath9k_nfcal_hist *h; 407 s16 default_nf; 408 int i, j; 409 410 ah->caldata->channel = chan->channel; 411 ah->caldata->channelFlags = chan->channelFlags; 412 ah->caldata->chanmode = chan->chanmode; 413 h = ah->caldata->nfCalHist; 414 default_nf = ath9k_hw_get_default_nf(ah, chan); 415 for (i = 0; i < NUM_NF_READINGS; i++) { 416 h[i].currIndex = 0; 417 h[i].privNF = default_nf; 418 h[i].invalidNFcount = AR_PHY_CCA_FILTERWINDOW_LENGTH; 419 for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) { 420 h[i].nfCalBuffer[j] = default_nf; 421 } 422 } 423 } 424 425 426 void ath9k_hw_bstuck_nfcal(struct ath_hw *ah) 427 { 428 struct ath9k_hw_cal_data *caldata = ah->caldata; 429 430 if (unlikely(!caldata)) 431 return; 432 433 /* 434 * If beacons are stuck, the most likely cause is interference. 435 * Triggering a noise floor calibration at this point helps the 436 * hardware adapt to a noisy environment much faster. 437 * To ensure that we recover from stuck beacons quickly, let 438 * the baseband update the internal NF value itself, similar to 439 * what is being done after a full reset. 440 */ 441 if (!caldata->nfcal_pending) 442 ath9k_hw_start_nfcal(ah, true); 443 else if (!(REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF)) 444 ath9k_hw_getnf(ah, ah->curchan); 445 446 caldata->nfcal_interference = true; 447 } 448 EXPORT_SYMBOL(ath9k_hw_bstuck_nfcal); 449 450