drivers/net/wireless/ath/ath9k/ar9003_paprd.c

   1 /*
   2  * Copyright (c) 2010-2011 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 "ar9003_phy.h"
  19
  20 void ar9003_paprd_enable(struct ath_hw *ah, bool val)
  21 {
  22         struct ath9k_channel *chan = ah->curchan;
  23         struct ar9300_eeprom *eep = &ah->eeprom.ar9300_eep;
  24
  25         /*
  26          * 3 bits for modalHeader5G.papdRateMaskHt20
  27          * is used for sub-band disabling of PAPRD.
  28          * 5G band is divided into 3 sub-bands -- upper,
  29          * middle, lower.
  30          * if bit 30 of modalHeader5G.papdRateMaskHt20 is set
  31          * -- disable PAPRD for upper band 5GHz
  32          * if bit 29 of modalHeader5G.papdRateMaskHt20 is set
  33          * -- disable PAPRD for middle band 5GHz
  34          * if bit 28 of modalHeader5G.papdRateMaskHt20 is set
  35          * -- disable PAPRD for lower band 5GHz
  36          */
  37
  38         if (IS_CHAN_5GHZ(chan)) {
  39                 if (chan->channel >= UPPER_5G_SUB_BAND_START) {
  40                         if (le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20)
  41                                                                   & BIT(30))
  42                                 val = false;
  43                 } else if (chan->channel >= MID_5G_SUB_BAND_START) {
  44                         if (le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20)
  45                                                                   & BIT(29))
  46                                 val = false;
  47                 } else {
  48                         if (le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20)
  49                                                                   & BIT(28))
  50                                 val = false;
  51                 }
  52         }
  53
  54         if (val) {
  55                 ah->paprd_table_write_done = true;
  56                 ath9k_hw_apply_txpower(ah, chan);
  57         }
  58
  59         REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B0,
  60                       AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
  61         if (ah->caps.tx_chainmask & BIT(1))
  62                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B1,
  63                               AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
  64         if (ah->caps.tx_chainmask & BIT(2))
  65                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B2,
  66                               AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
  67 }
  68 EXPORT_SYMBOL(ar9003_paprd_enable);
  69
  70 static int ar9003_get_training_power_2g(struct ath_hw *ah)
  71 {
  72         struct ath9k_channel *chan = ah->curchan;
  73         unsigned int power, scale, delta;
  74
  75         scale = ar9003_get_paprd_scale_factor(ah, chan);
  76         power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE5,
  77                                AR_PHY_POWERTX_RATE5_POWERTXHT20_0);
  78
  79         delta = abs((int) ah->paprd_target_power - (int) power);
  80         if (delta > scale)
  81                 return -1;
  82
  83         if (delta < 4)
  84                 power -= 4 - delta;
  85
  86         return power;
  87 }
  88
  89 static int ar9003_get_training_power_5g(struct ath_hw *ah)
  90 {
  91         struct ath_common *common = ath9k_hw_common(ah);
  92         struct ath9k_channel *chan = ah->curchan;
  93         unsigned int power, scale, delta;
  94
  95         scale = ar9003_get_paprd_scale_factor(ah, chan);
  96
  97         if (IS_CHAN_HT40(chan))
  98                 power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE8,
  99                         AR_PHY_POWERTX_RATE8_POWERTXHT40_5);
 100         else
 101                 power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE6,
 102                         AR_PHY_POWERTX_RATE6_POWERTXHT20_5);
 103
 104         power += scale;
 105         delta = abs((int) ah->paprd_target_power - (int) power);
 106         if (delta > scale)
 107                 return -1;
 108
 109         switch (get_streams(ah->txchainmask)) {
 110         case 1:
 111                 delta = 6;
 112                 break;
 113         case 2:
 114                 delta = 4;
 115                 break;
 116         case 3:
 117                 delta = 2;
 118                 break;
 119         default:
 120                 delta = 0;
 121                 ath_dbg(common, ATH_DBG_CALIBRATE,
 122                 "Invalid tx-chainmask: %u\n", ah->txchainmask);
 123         }
 124
 125         power += delta;
 126         return power;
 127 }
 128
 129 static int ar9003_paprd_setup_single_table(struct ath_hw *ah)
 130 {
 131         struct ath_common *common = ath9k_hw_common(ah);
 132         static const u32 ctrl0[3] = {
 133                 AR_PHY_PAPRD_CTRL0_B0,
 134                 AR_PHY_PAPRD_CTRL0_B1,
 135                 AR_PHY_PAPRD_CTRL0_B2
 136         };
 137         static const u32 ctrl1[3] = {
 138                 AR_PHY_PAPRD_CTRL1_B0,
 139                 AR_PHY_PAPRD_CTRL1_B1,
 140                 AR_PHY_PAPRD_CTRL1_B2
 141         };
 142         int training_power;
 143         int i, val;
 144
 145         if (IS_CHAN_2GHZ(ah->curchan))
 146                 training_power = ar9003_get_training_power_2g(ah);
 147         else
 148                 training_power = ar9003_get_training_power_5g(ah);
 149
 150         ath_dbg(common, ATH_DBG_CALIBRATE,
 151                 "Training power: %d, Target power: %d\n",
 152                 training_power, ah->paprd_target_power);
 153
 154         if (training_power < 0) {
 155                 ath_dbg(common, ATH_DBG_CALIBRATE,
 156                         "PAPRD target power delta out of range");
 157                 return -ERANGE;
 158         }
 159         ah->paprd_training_power = training_power;
 160
 161         REG_RMW_FIELD(ah, AR_PHY_PAPRD_AM2AM, AR_PHY_PAPRD_AM2AM_MASK,
 162                       ah->paprd_ratemask);
 163         REG_RMW_FIELD(ah, AR_PHY_PAPRD_AM2PM, AR_PHY_PAPRD_AM2PM_MASK,
 164                       ah->paprd_ratemask);
 165         REG_RMW_FIELD(ah, AR_PHY_PAPRD_HT40, AR_PHY_PAPRD_HT40_MASK,
 166                       ah->paprd_ratemask_ht40);
 167
 168         for (i = 0; i < ah->caps.max_txchains; i++) {
 169                 REG_RMW_FIELD(ah, ctrl0[i],
 170                               AR_PHY_PAPRD_CTRL0_USE_SINGLE_TABLE_MASK, 1);
 171                 REG_RMW_FIELD(ah, ctrl1[i],
 172                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_AM2PM_ENABLE, 1);
 173                 REG_RMW_FIELD(ah, ctrl1[i],
 174                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_AM2AM_ENABLE, 1);
 175                 REG_RMW_FIELD(ah, ctrl1[i],
 176                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_SCALING_ENA, 0);
 177                 REG_RMW_FIELD(ah, ctrl1[i],
 178                               AR_PHY_PAPRD_CTRL1_PA_GAIN_SCALE_FACT_MASK, 181);
 179                 REG_RMW_FIELD(ah, ctrl1[i],
 180                               AR_PHY_PAPRD_CTRL1_PAPRD_MAG_SCALE_FACT, 361);
 181                 REG_RMW_FIELD(ah, ctrl1[i],
 182                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_SCALING_ENA, 0);
 183                 REG_RMW_FIELD(ah, ctrl0[i],
 184                               AR_PHY_PAPRD_CTRL0_PAPRD_MAG_THRSH, 3);
 185         }
 186
 187         ar9003_paprd_enable(ah, false);
 188
 189         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 190                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_LB_SKIP, 0x30);
 191         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 192                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_LB_ENABLE, 1);
 193         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 194                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_TX_GAIN_FORCE, 1);
 195         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 196                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_RX_BB_GAIN_FORCE, 0);
 197         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 198                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_IQCORR_ENABLE, 0);
 199         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 200                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_AGC2_SETTLING, 28);
 201         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 202                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_CF_PAPRD_TRAIN_ENABLE, 1);
 203         val = AR_SREV_9462(ah) ? 0x91 : 147;
 204         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL2,
 205                       AR_PHY_PAPRD_TRAINER_CNTL2_CF_PAPRD_INIT_RX_BB_GAIN, val);
 206         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 207                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_FINE_CORR_LEN, 4);
 208         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 209                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_COARSE_CORR_LEN, 4);
 210         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 211                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_NUM_CORR_STAGES, 7);
 212         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 213                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_MIN_LOOPBACK_DEL, 1);
 214         if (AR_SREV_9485(ah) || AR_SREV_9462(ah))
 215                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 216                               AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
 217                               -3);
 218         else
 219                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 220                               AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
 221                               -6);
 222         val = AR_SREV_9462(ah) ? -10 : -15;
 223         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 224                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_ADC_DESIRED_SIZE,
 225                       val);
 226         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 227                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_BBTXMIX_DISABLE, 1);
 228         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
 229                       AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_SAFETY_DELTA, 0);
 230         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
 231                       AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_MIN_CORR, 400);
 232         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
 233                       AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_NUM_TRAIN_SAMPLES,
 234                       100);
 235         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_0_B0,
 236                       AR_PHY_PAPRD_PRE_POST_SCALING, 261376);
 237         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_1_B0,
 238                       AR_PHY_PAPRD_PRE_POST_SCALING, 248079);
 239         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_2_B0,
 240                       AR_PHY_PAPRD_PRE_POST_SCALING, 233759);
 241         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_3_B0,
 242                       AR_PHY_PAPRD_PRE_POST_SCALING, 220464);
 243         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_4_B0,
 244                       AR_PHY_PAPRD_PRE_POST_SCALING, 208194);
 245         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_5_B0,
 246                       AR_PHY_PAPRD_PRE_POST_SCALING, 196949);
 247         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_6_B0,
 248                       AR_PHY_PAPRD_PRE_POST_SCALING, 185706);
 249         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_7_B0,
 250                       AR_PHY_PAPRD_PRE_POST_SCALING, 175487);
 251         return 0;
 252 }
 253
 254 static void ar9003_paprd_get_gain_table(struct ath_hw *ah)
 255 {
 256         u32 *entry = ah->paprd_gain_table_entries;
 257         u8 *index = ah->paprd_gain_table_index;
 258         u32 reg = AR_PHY_TXGAIN_TABLE;
 259         int i;
 260
 261         memset(entry, 0, sizeof(ah->paprd_gain_table_entries));
 262         memset(index, 0, sizeof(ah->paprd_gain_table_index));
 263
 264         for (i = 0; i < PAPRD_GAIN_TABLE_ENTRIES; i++) {
 265                 entry[i] = REG_READ(ah, reg);
 266                 index[i] = (entry[i] >> 24) & 0xff;
 267                 reg += 4;
 268         }
 269 }
 270
 271 static unsigned int ar9003_get_desired_gain(struct ath_hw *ah, int chain,
 272                                             int target_power)
 273 {
 274         int olpc_gain_delta = 0, cl_gain_mod;
 275         int alpha_therm, alpha_volt;
 276         int therm_cal_value, volt_cal_value;
 277         int therm_value, volt_value;
 278         int thermal_gain_corr, voltage_gain_corr;
 279         int desired_scale, desired_gain = 0;
 280         u32 reg_olpc  = 0, reg_cl_gain  = 0;
 281
 282         REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 283                     AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 284         desired_scale = REG_READ_FIELD(ah, AR_PHY_TPC_12,
 285                                        AR_PHY_TPC_12_DESIRED_SCALE_HT40_5);
 286         alpha_therm = REG_READ_FIELD(ah, AR_PHY_TPC_19,
 287                                      AR_PHY_TPC_19_ALPHA_THERM);
 288         alpha_volt = REG_READ_FIELD(ah, AR_PHY_TPC_19,
 289                                     AR_PHY_TPC_19_ALPHA_VOLT);
 290         therm_cal_value = REG_READ_FIELD(ah, AR_PHY_TPC_18,
 291                                          AR_PHY_TPC_18_THERM_CAL_VALUE);
 292         volt_cal_value = REG_READ_FIELD(ah, AR_PHY_TPC_18,
 293                                         AR_PHY_TPC_18_VOLT_CAL_VALUE);
 294         therm_value = REG_READ_FIELD(ah, AR_PHY_BB_THERM_ADC_4,
 295                                      AR_PHY_BB_THERM_ADC_4_LATEST_THERM_VALUE);
 296         volt_value = REG_READ_FIELD(ah, AR_PHY_BB_THERM_ADC_4,
 297                                     AR_PHY_BB_THERM_ADC_4_LATEST_VOLT_VALUE);
 298
 299         switch (chain) {
 300         case 0:
 301                 reg_olpc = AR_PHY_TPC_11_B0;
 302                 reg_cl_gain = AR_PHY_CL_TAB_0;
 303                 break;
 304         case 1:
 305                 reg_olpc = AR_PHY_TPC_11_B1;
 306                 reg_cl_gain = AR_PHY_CL_TAB_1;
 307                 break;
 308         case 2:
 309                 reg_olpc = AR_PHY_TPC_11_B2;
 310                 reg_cl_gain = AR_PHY_CL_TAB_2;
 311                 break;
 312         default:
 313                 ath_dbg(ath9k_hw_common(ah), ATH_DBG_CALIBRATE,
 314                 "Invalid chainmask: %d\n", chain);
 315                 break;
 316         }
 317
 318         olpc_gain_delta = REG_READ_FIELD(ah, reg_olpc,
 319                                          AR_PHY_TPC_11_OLPC_GAIN_DELTA);
 320         cl_gain_mod = REG_READ_FIELD(ah, reg_cl_gain,
 321                                          AR_PHY_CL_TAB_CL_GAIN_MOD);
 322
 323         if (olpc_gain_delta >= 128)
 324                 olpc_gain_delta = olpc_gain_delta - 256;
 325
 326         thermal_gain_corr = (alpha_therm * (therm_value - therm_cal_value) +
 327                              (256 / 2)) / 256;
 328         voltage_gain_corr = (alpha_volt * (volt_value - volt_cal_value) +
 329                              (128 / 2)) / 128;
 330         desired_gain = target_power - olpc_gain_delta - thermal_gain_corr -
 331             voltage_gain_corr + desired_scale + cl_gain_mod;
 332
 333         return desired_gain;
 334 }
 335
 336 static void ar9003_tx_force_gain(struct ath_hw *ah, unsigned int gain_index)
 337 {
 338         int selected_gain_entry, txbb1dbgain, txbb6dbgain, txmxrgain;
 339         int padrvgnA, padrvgnB, padrvgnC, padrvgnD;
 340         u32 *gain_table_entries = ah->paprd_gain_table_entries;
 341
 342         selected_gain_entry = gain_table_entries[gain_index];
 343         txbb1dbgain = selected_gain_entry & 0x7;
 344         txbb6dbgain = (selected_gain_entry >> 3) & 0x3;
 345         txmxrgain = (selected_gain_entry >> 5) & 0xf;
 346         padrvgnA = (selected_gain_entry >> 9) & 0xf;
 347         padrvgnB = (selected_gain_entry >> 13) & 0xf;
 348         padrvgnC = (selected_gain_entry >> 17) & 0xf;
 349         padrvgnD = (selected_gain_entry >> 21) & 0x3;
 350
 351         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 352                       AR_PHY_TX_FORCED_GAIN_FORCED_TXBB1DBGAIN, txbb1dbgain);
 353         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 354                       AR_PHY_TX_FORCED_GAIN_FORCED_TXBB6DBGAIN, txbb6dbgain);
 355         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 356                       AR_PHY_TX_FORCED_GAIN_FORCED_TXMXRGAIN, txmxrgain);
 357         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 358                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNA, padrvgnA);
 359         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 360                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNB, padrvgnB);
 361         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 362                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNC, padrvgnC);
 363         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 364                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGND, padrvgnD);
 365         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 366                       AR_PHY_TX_FORCED_GAIN_FORCED_ENABLE_PAL, 0);
 367         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 368                       AR_PHY_TX_FORCED_GAIN_FORCE_TX_GAIN, 0);
 369         REG_RMW_FIELD(ah, AR_PHY_TPC_1, AR_PHY_TPC_1_FORCED_DAC_GAIN, 0);
 370         REG_RMW_FIELD(ah, AR_PHY_TPC_1, AR_PHY_TPC_1_FORCE_DAC_GAIN, 0);
 371 }
 372
 373 static inline int find_expn(int num)
 374 {
 375         return fls(num) - 1;
 376 }
 377
 378 static inline int find_proper_scale(int expn, int N)
 379 {
 380         return (expn > N) ? expn - 10 : 0;
 381 }
 382
 383 #define NUM_BIN 23
 384
 385 static bool create_pa_curve(u32 *data_L, u32 *data_U, u32 *pa_table, u16 *gain)
 386 {
 387         unsigned int thresh_accum_cnt;
 388         int x_est[NUM_BIN + 1], Y[NUM_BIN + 1], theta[NUM_BIN + 1];
 389         int PA_in[NUM_BIN + 1];
 390         int B1_tmp[NUM_BIN + 1], B2_tmp[NUM_BIN + 1];
 391         unsigned int B1_abs_max, B2_abs_max;
 392         int max_index, scale_factor;
 393         int y_est[NUM_BIN + 1];
 394         int x_est_fxp1_nonlin, x_tilde[NUM_BIN + 1];
 395         unsigned int x_tilde_abs;
 396         int G_fxp, Y_intercept, order_x_by_y, M, I, L, sum_y_sqr, sum_y_quad;
 397         int Q_x, Q_B1, Q_B2, beta_raw, alpha_raw, scale_B;
 398         int Q_scale_B, Q_beta, Q_alpha, alpha, beta, order_1, order_2;
 399         int order1_5x, order2_3x, order1_5x_rem, order2_3x_rem;
 400         int y5, y3, tmp;
 401         int theta_low_bin = 0;
 402         int i;
 403
 404         /* disregard any bin that contains <= 16 samples */
 405         thresh_accum_cnt = 16;
 406         scale_factor = 5;
 407         max_index = 0;
 408         memset(theta, 0, sizeof(theta));
 409         memset(x_est, 0, sizeof(x_est));
 410         memset(Y, 0, sizeof(Y));
 411         memset(y_est, 0, sizeof(y_est));
 412         memset(x_tilde, 0, sizeof(x_tilde));
 413
 414         for (i = 0; i < NUM_BIN; i++) {
 415                 s32 accum_cnt, accum_tx, accum_rx, accum_ang;
 416
 417                 /* number of samples */
 418                 accum_cnt = data_L[i] & 0xffff;
 419
 420                 if (accum_cnt <= thresh_accum_cnt)
 421                         continue;
 422
 423                 /* sum(tx amplitude) */
 424                 accum_tx = ((data_L[i] >> 16) & 0xffff) |
 425                     ((data_U[i] & 0x7ff) << 16);
 426
 427                 /* sum(rx amplitude distance to lower bin edge) */
 428                 accum_rx = ((data_U[i] >> 11) & 0x1f) |
 429                     ((data_L[i + 23] & 0xffff) << 5);
 430
 431                 /* sum(angles) */
 432                 accum_ang = ((data_L[i + 23] >> 16) & 0xffff) |
 433                     ((data_U[i + 23] & 0x7ff) << 16);
 434
 435                 accum_tx <<= scale_factor;
 436                 accum_rx <<= scale_factor;
 437                 x_est[i + 1] = (((accum_tx + accum_cnt) / accum_cnt) + 32) >>
 438                     scale_factor;
 439
 440                 Y[i + 1] = ((((accum_rx + accum_cnt) / accum_cnt) + 32) >>
 441                             scale_factor) +
 442                             (1 << scale_factor) * max_index + 16;
 443
 444                 if (accum_ang >= (1 << 26))
 445                         accum_ang -= 1 << 27;
 446
 447                 theta[i + 1] = ((accum_ang * (1 << scale_factor)) + accum_cnt) /
 448                     accum_cnt;
 449
 450                 max_index++;
 451         }
 452
 453         /*
 454          * Find average theta of first 5 bin and all of those to same value.
 455          * Curve is linear at that range.
 456          */
 457         for (i = 1; i < 6; i++)
 458                 theta_low_bin += theta[i];
 459
 460         theta_low_bin = theta_low_bin / 5;
 461         for (i = 1; i < 6; i++)
 462                 theta[i] = theta_low_bin;
 463
 464         /* Set values at origin */
 465         theta[0] = theta_low_bin;
 466         for (i = 0; i <= max_index; i++)
 467                 theta[i] -= theta_low_bin;
 468
 469         x_est[0] = 0;
 470         Y[0] = 0;
 471         scale_factor = 8;
 472
 473         /* low signal gain */
 474         if (x_est[6] == x_est[3])
 475                 return false;
 476
 477         G_fxp =
 478             (((Y[6] - Y[3]) * 1 << scale_factor) +
 479              (x_est[6] - x_est[3])) / (x_est[6] - x_est[3]);
 480
 481         /* prevent division by zero */
 482         if (G_fxp == 0)
 483                 return false;
 484
 485         Y_intercept =
 486             (G_fxp * (x_est[0] - x_est[3]) +
 487              (1 << scale_factor)) / (1 << scale_factor) + Y[3];
 488
 489         for (i = 0; i <= max_index; i++)
 490                 y_est[i] = Y[i] - Y_intercept;
 491
 492         for (i = 0; i <= 3; i++) {
 493                 y_est[i] = i * 32;
 494                 x_est[i] = ((y_est[i] * 1 << scale_factor) + G_fxp) / G_fxp;
 495         }
 496
 497         if (y_est[max_index] == 0)
 498                 return false;
 499
 500         x_est_fxp1_nonlin =
 501             x_est[max_index] - ((1 << scale_factor) * y_est[max_index] +
 502                                 G_fxp) / G_fxp;
 503
 504         order_x_by_y =
 505             (x_est_fxp1_nonlin + y_est[max_index]) / y_est[max_index];
 506
 507         if (order_x_by_y == 0)
 508                 M = 10;
 509         else if (order_x_by_y == 1)
 510                 M = 9;
 511         else
 512                 M = 8;
 513
 514         I = (max_index > 15) ? 7 : max_index >> 1;
 515         L = max_index - I;
 516         scale_factor = 8;
 517         sum_y_sqr = 0;
 518         sum_y_quad = 0;
 519         x_tilde_abs = 0;
 520
 521         for (i = 0; i <= L; i++) {
 522                 unsigned int y_sqr;
 523                 unsigned int y_quad;
 524                 unsigned int tmp_abs;
 525
 526                 /* prevent division by zero */
 527                 if (y_est[i + I] == 0)
 528                         return false;
 529
 530                 x_est_fxp1_nonlin =
 531                     x_est[i + I] - ((1 << scale_factor) * y_est[i + I] +
 532                                     G_fxp) / G_fxp;
 533
 534                 x_tilde[i] =
 535                     (x_est_fxp1_nonlin * (1 << M) + y_est[i + I]) / y_est[i +
 536                                                                           I];
 537                 x_tilde[i] =
 538                     (x_tilde[i] * (1 << M) + y_est[i + I]) / y_est[i + I];
 539                 x_tilde[i] =
 540                     (x_tilde[i] * (1 << M) + y_est[i + I]) / y_est[i + I];
 541                 y_sqr =
 542                     (y_est[i + I] * y_est[i + I] +
 543                      (scale_factor * scale_factor)) / (scale_factor *
 544                                                        scale_factor);
 545                 tmp_abs = abs(x_tilde[i]);
 546                 if (tmp_abs > x_tilde_abs)
 547                         x_tilde_abs = tmp_abs;
 548
 549                 y_quad = y_sqr * y_sqr;
 550                 sum_y_sqr = sum_y_sqr + y_sqr;
 551                 sum_y_quad = sum_y_quad + y_quad;
 552                 B1_tmp[i] = y_sqr * (L + 1);
 553                 B2_tmp[i] = y_sqr;
 554         }
 555
 556         B1_abs_max = 0;
 557         B2_abs_max = 0;
 558         for (i = 0; i <= L; i++) {
 559                 int abs_val;
 560
 561                 B1_tmp[i] -= sum_y_sqr;
 562                 B2_tmp[i] = sum_y_quad - sum_y_sqr * B2_tmp[i];
 563
 564                 abs_val = abs(B1_tmp[i]);
 565                 if (abs_val > B1_abs_max)
 566                         B1_abs_max = abs_val;
 567
 568                 abs_val = abs(B2_tmp[i]);
 569                 if (abs_val > B2_abs_max)
 570                         B2_abs_max = abs_val;
 571         }
 572
 573         Q_x = find_proper_scale(find_expn(x_tilde_abs), 10);
 574         Q_B1 = find_proper_scale(find_expn(B1_abs_max), 10);
 575         Q_B2 = find_proper_scale(find_expn(B2_abs_max), 10);
 576
 577         beta_raw = 0;
 578         alpha_raw = 0;
 579         for (i = 0; i <= L; i++) {
 580                 x_tilde[i] = x_tilde[i] / (1 << Q_x);
 581                 B1_tmp[i] = B1_tmp[i] / (1 << Q_B1);
 582                 B2_tmp[i] = B2_tmp[i] / (1 << Q_B2);
 583                 beta_raw = beta_raw + B1_tmp[i] * x_tilde[i];
 584                 alpha_raw = alpha_raw + B2_tmp[i] * x_tilde[i];
 585         }
 586
 587         scale_B =
 588             ((sum_y_quad / scale_factor) * (L + 1) -
 589              (sum_y_sqr / scale_factor) * sum_y_sqr) * scale_factor;
 590
 591         Q_scale_B = find_proper_scale(find_expn(abs(scale_B)), 10);
 592         scale_B = scale_B / (1 << Q_scale_B);
 593         if (scale_B == 0)
 594                 return false;
 595         Q_beta = find_proper_scale(find_expn(abs(beta_raw)), 10);
 596         Q_alpha = find_proper_scale(find_expn(abs(alpha_raw)), 10);
 597         beta_raw = beta_raw / (1 << Q_beta);
 598         alpha_raw = alpha_raw / (1 << Q_alpha);
 599         alpha = (alpha_raw << 10) / scale_B;
 600         beta = (beta_raw << 10) / scale_B;
 601         order_1 = 3 * M - Q_x - Q_B1 - Q_beta + 10 + Q_scale_B;
 602         order_2 = 3 * M - Q_x - Q_B2 - Q_alpha + 10 + Q_scale_B;
 603         order1_5x = order_1 / 5;
 604         order2_3x = order_2 / 3;
 605         order1_5x_rem = order_1 - 5 * order1_5x;
 606         order2_3x_rem = order_2 - 3 * order2_3x;
 607
 608         for (i = 0; i < PAPRD_TABLE_SZ; i++) {
 609                 tmp = i * 32;
 610                 y5 = ((beta * tmp) >> 6) >> order1_5x;
 611                 y5 = (y5 * tmp) >> order1_5x;
 612                 y5 = (y5 * tmp) >> order1_5x;
 613                 y5 = (y5 * tmp) >> order1_5x;
 614                 y5 = (y5 * tmp) >> order1_5x;
 615                 y5 = y5 >> order1_5x_rem;
 616                 y3 = (alpha * tmp) >> order2_3x;
 617                 y3 = (y3 * tmp) >> order2_3x;
 618                 y3 = (y3 * tmp) >> order2_3x;
 619                 y3 = y3 >> order2_3x_rem;
 620                 PA_in[i] = y5 + y3 + (256 * tmp) / G_fxp;
 621
 622                 if (i >= 2) {
 623                         tmp = PA_in[i] - PA_in[i - 1];
 624                         if (tmp < 0)
 625                                 PA_in[i] =
 626                                     PA_in[i - 1] + (PA_in[i - 1] -
 627                                                     PA_in[i - 2]);
 628                 }
 629
 630                 PA_in[i] = (PA_in[i] < 1400) ? PA_in[i] : 1400;
 631         }
 632
 633         beta_raw = 0;
 634         alpha_raw = 0;
 635
 636         for (i = 0; i <= L; i++) {
 637                 int theta_tilde =
 638                     ((theta[i + I] << M) + y_est[i + I]) / y_est[i + I];
 639                 theta_tilde =
 640                     ((theta_tilde << M) + y_est[i + I]) / y_est[i + I];
 641                 theta_tilde =
 642                     ((theta_tilde << M) + y_est[i + I]) / y_est[i + I];
 643                 beta_raw = beta_raw + B1_tmp[i] * theta_tilde;
 644                 alpha_raw = alpha_raw + B2_tmp[i] * theta_tilde;
 645         }
 646
 647         Q_beta = find_proper_scale(find_expn(abs(beta_raw)), 10);
 648         Q_alpha = find_proper_scale(find_expn(abs(alpha_raw)), 10);
 649         beta_raw = beta_raw / (1 << Q_beta);
 650         alpha_raw = alpha_raw / (1 << Q_alpha);
 651
 652         alpha = (alpha_raw << 10) / scale_B;
 653         beta = (beta_raw << 10) / scale_B;
 654         order_1 = 3 * M - Q_x - Q_B1 - Q_beta + 10 + Q_scale_B + 5;
 655         order_2 = 3 * M - Q_x - Q_B2 - Q_alpha + 10 + Q_scale_B + 5;
 656         order1_5x = order_1 / 5;
 657         order2_3x = order_2 / 3;
 658         order1_5x_rem = order_1 - 5 * order1_5x;
 659         order2_3x_rem = order_2 - 3 * order2_3x;
 660
 661         for (i = 0; i < PAPRD_TABLE_SZ; i++) {
 662                 int PA_angle;
 663
 664                 /* pa_table[4] is calculated from PA_angle for i=5 */
 665                 if (i == 4)
 666                         continue;
 667
 668                 tmp = i * 32;
 669                 if (beta > 0)
 670                         y5 = (((beta * tmp - 64) >> 6) -
 671                               (1 << order1_5x)) / (1 << order1_5x);
 672                 else
 673                         y5 = ((((beta * tmp - 64) >> 6) +
 674                                (1 << order1_5x)) / (1 << order1_5x));
 675
 676                 y5 = (y5 * tmp) / (1 << order1_5x);
 677                 y5 = (y5 * tmp) / (1 << order1_5x);
 678                 y5 = (y5 * tmp) / (1 << order1_5x);
 679                 y5 = (y5 * tmp) / (1 << order1_5x);
 680                 y5 = y5 / (1 << order1_5x_rem);
 681
 682                 if (beta > 0)
 683                         y3 = (alpha * tmp -
 684                               (1 << order2_3x)) / (1 << order2_3x);
 685                 else
 686                         y3 = (alpha * tmp +
 687                               (1 << order2_3x)) / (1 << order2_3x);
 688                 y3 = (y3 * tmp) / (1 << order2_3x);
 689                 y3 = (y3 * tmp) / (1 << order2_3x);
 690                 y3 = y3 / (1 << order2_3x_rem);
 691
 692                 if (i < 4) {
 693                         PA_angle = 0;
 694                 } else {
 695                         PA_angle = y5 + y3;
 696                         if (PA_angle < -150)
 697                                 PA_angle = -150;
 698                         else if (PA_angle > 150)
 699                                 PA_angle = 150;
 700                 }
 701
 702                 pa_table[i] = ((PA_in[i] & 0x7ff) << 11) + (PA_angle & 0x7ff);
 703                 if (i == 5) {
 704                         PA_angle = (PA_angle + 2) >> 1;
 705                         pa_table[i - 1] = ((PA_in[i - 1] & 0x7ff) << 11) +
 706                             (PA_angle & 0x7ff);
 707                 }
 708         }
 709
 710         *gain = G_fxp;
 711         return true;
 712 }
 713
 714 void ar9003_paprd_populate_single_table(struct ath_hw *ah,
 715                                         struct ath9k_hw_cal_data *caldata,
 716                                         int chain)
 717 {
 718         u32 *paprd_table_val = caldata->pa_table[chain];
 719         u32 small_signal_gain = caldata->small_signal_gain[chain];
 720         u32 training_power = ah->paprd_training_power;
 721         u32 reg = 0;
 722         int i;
 723
 724         if (chain == 0)
 725                 reg = AR_PHY_PAPRD_MEM_TAB_B0;
 726         else if (chain == 1)
 727                 reg = AR_PHY_PAPRD_MEM_TAB_B1;
 728         else if (chain == 2)
 729                 reg = AR_PHY_PAPRD_MEM_TAB_B2;
 730
 731         for (i = 0; i < PAPRD_TABLE_SZ; i++) {
 732                 REG_WRITE(ah, reg, paprd_table_val[i]);
 733                 reg = reg + 4;
 734         }
 735
 736         if (chain == 0)
 737                 reg = AR_PHY_PA_GAIN123_B0;
 738         else if (chain == 1)
 739                 reg = AR_PHY_PA_GAIN123_B1;
 740         else
 741                 reg = AR_PHY_PA_GAIN123_B2;
 742
 743         REG_RMW_FIELD(ah, reg, AR_PHY_PA_GAIN123_PA_GAIN1, small_signal_gain);
 744
 745         REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B0,
 746                       AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
 747                       training_power);
 748
 749         if (ah->caps.tx_chainmask & BIT(1))
 750                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B1,
 751                               AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
 752                               training_power);
 753
 754         if (ah->caps.tx_chainmask & BIT(2))
 755                 /* val AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL correct? */
 756                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B2,
 757                               AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
 758                               training_power);
 759 }
 760 EXPORT_SYMBOL(ar9003_paprd_populate_single_table);
 761
 762 int ar9003_paprd_setup_gain_table(struct ath_hw *ah, int chain)
 763 {
 764         unsigned int i, desired_gain, gain_index;
 765         unsigned int train_power = ah->paprd_training_power;
 766
 767         desired_gain = ar9003_get_desired_gain(ah, chain, train_power);
 768
 769         gain_index = 0;
 770         for (i = 0; i < PAPRD_GAIN_TABLE_ENTRIES; i++) {
 771                 if (ah->paprd_gain_table_index[i] >= desired_gain)
 772                         break;
 773                 gain_index++;
 774         }
 775
 776         ar9003_tx_force_gain(ah, gain_index);
 777
 778         REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 779                         AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 780
 781         return 0;
 782 }
 783 EXPORT_SYMBOL(ar9003_paprd_setup_gain_table);
 784
 785 int ar9003_paprd_create_curve(struct ath_hw *ah,
 786                               struct ath9k_hw_cal_data *caldata, int chain)
 787 {
 788         u16 *small_signal_gain = &caldata->small_signal_gain[chain];
 789         u32 *pa_table = caldata->pa_table[chain];
 790         u32 *data_L, *data_U;
 791         int i, status = 0;
 792         u32 *buf;
 793         u32 reg;
 794
 795         memset(caldata->pa_table[chain], 0, sizeof(caldata->pa_table[chain]));
 796
 797         buf = kmalloc(2 * 48 * sizeof(u32), GFP_ATOMIC);
 798         if (!buf)
 799                 return -ENOMEM;
 800
 801         data_L = &buf[0];
 802         data_U = &buf[48];
 803
 804         REG_CLR_BIT(ah, AR_PHY_CHAN_INFO_MEMORY,
 805                     AR_PHY_CHAN_INFO_MEMORY_CHANINFOMEM_S2_READ);
 806
 807         reg = AR_PHY_CHAN_INFO_TAB_0;
 808         for (i = 0; i < 48; i++)
 809                 data_L[i] = REG_READ(ah, reg + (i << 2));
 810
 811         REG_SET_BIT(ah, AR_PHY_CHAN_INFO_MEMORY,
 812                     AR_PHY_CHAN_INFO_MEMORY_CHANINFOMEM_S2_READ);
 813
 814         for (i = 0; i < 48; i++)
 815                 data_U[i] = REG_READ(ah, reg + (i << 2));
 816
 817         if (!create_pa_curve(data_L, data_U, pa_table, small_signal_gain))
 818                 status = -2;
 819
 820         REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 821                     AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 822
 823         kfree(buf);
 824
 825         return status;
 826 }
 827 EXPORT_SYMBOL(ar9003_paprd_create_curve);
 828
 829 int ar9003_paprd_init_table(struct ath_hw *ah)
 830 {
 831         int ret;
 832
 833         ret = ar9003_paprd_setup_single_table(ah);
 834         if (ret < 0)
 835             return ret;
 836
 837         ar9003_paprd_get_gain_table(ah);
 838         return 0;
 839 }
 840 EXPORT_SYMBOL(ar9003_paprd_init_table);
 841
 842 bool ar9003_paprd_is_done(struct ath_hw *ah)
 843 {
 844         int paprd_done, agc2_pwr;
 845         paprd_done = REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 846                                 AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 847
 848         if (paprd_done == 0x1) {
 849                 agc2_pwr = REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 850                                 AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_AGC2_PWR);
 851
 852                 ath_dbg(ath9k_hw_common(ah), ATH_DBG_CALIBRATE,
 853                         "AGC2_PWR = 0x%x training done = 0x%x\n",
 854                         agc2_pwr, paprd_done);
 855         /*
 856          * agc2_pwr range should not be less than 'IDEAL_AGC2_PWR_CHANGE'
 857          * when the training is completely done, otherwise retraining is
 858          * done to make sure the value is in ideal range
 859          */
 860                 if (agc2_pwr <= PAPRD_IDEAL_AGC2_PWR_RANGE)
 861                         paprd_done = 0;
 862         }
 863
 864         return !!paprd_done;
 865 }
 866 EXPORT_SYMBOL(ar9003_paprd_is_done);