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 ath_regulatory *regulatory = ath9k_hw_regulatory(ah);
  23         struct ath9k_channel *chan = ah->curchan;
  24         struct ar9300_eeprom *eep = &ah->eeprom.ar9300_eep;
  25
  26         /*
  27          * 3 bits for modalHeader5G.papdRateMaskHt20
  28          * is used for sub-band disabling of PAPRD.
  29          * 5G band is divided into 3 sub-bands -- upper,
  30          * middle, lower.
  31          * if bit 30 of modalHeader5G.papdRateMaskHt20 is set
  32          * -- disable PAPRD for upper band 5GHz
  33          * if bit 29 of modalHeader5G.papdRateMaskHt20 is set
  34          * -- disable PAPRD for middle band 5GHz
  35          * if bit 28 of modalHeader5G.papdRateMaskHt20 is set
  36          * -- disable PAPRD for lower band 5GHz
  37          */
  38
  39         if (IS_CHAN_5GHZ(chan)) {
  40                 if (chan->channel >= UPPER_5G_SUB_BAND_START) {
  41                         if (le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20)
  42                                                                   & BIT(30))
  43                                 val = false;
  44                 } else if (chan->channel >= MID_5G_SUB_BAND_START) {
  45                         if (le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20)
  46                                                                   & BIT(29))
  47                                 val = false;
  48                 } else {
  49                         if (le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20)
  50                                                                   & BIT(28))
  51                                 val = false;
  52                 }
  53         }
  54
  55         if (val) {
  56                 ah->paprd_table_write_done = true;
  57
  58                 ah->eep_ops->set_txpower(ah, chan,
  59                                 ath9k_regd_get_ctl(regulatory, chan),
  60                                 chan->chan->max_antenna_gain * 2,
  61                                 chan->chan->max_power * 2,
  62                                 min((u32) MAX_RATE_POWER,
  63                                 (u32) regulatory->power_limit), false);
  64         }
  65
  66         REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B0,
  67                       AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
  68         if (ah->caps.tx_chainmask & BIT(1))
  69                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B1,
  70                               AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
  71         if (ah->caps.tx_chainmask & BIT(2))
  72                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B2,
  73                               AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
  74 }
  75 EXPORT_SYMBOL(ar9003_paprd_enable);
  76
  77 static int ar9003_get_training_power_2g(struct ath_hw *ah)
  78 {
  79         struct ath9k_channel *chan = ah->curchan;
  80         unsigned int power, scale, delta;
  81
  82         scale = ar9003_get_paprd_scale_factor(ah, chan);
  83         power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE5,
  84                                AR_PHY_POWERTX_RATE5_POWERTXHT20_0);
  85
  86         delta = abs((int) ah->paprd_target_power - (int) power);
  87         if (delta > scale)
  88                 return -1;
  89
  90         if (delta < 4)
  91                 power -= 4 - delta;
  92
  93         return power;
  94 }
  95
  96 static int ar9003_get_training_power_5g(struct ath_hw *ah)
  97 {
  98         struct ath_common *common = ath9k_hw_common(ah);
  99         struct ath9k_channel *chan = ah->curchan;
 100         unsigned int power, scale, delta;
 101
 102         scale = ar9003_get_paprd_scale_factor(ah, chan);
 103
 104         if (IS_CHAN_HT40(chan))
 105                 power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE8,
 106                         AR_PHY_POWERTX_RATE8_POWERTXHT40_5);
 107         else
 108                 power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE6,
 109                         AR_PHY_POWERTX_RATE6_POWERTXHT20_5);
 110
 111         power += scale;
 112         delta = abs((int) ah->paprd_target_power - (int) power);
 113         if (delta > scale)
 114                 return -1;
 115
 116         switch (get_streams(common->tx_chainmask)) {
 117         case 1:
 118                 delta = 6;
 119                 break;
 120         case 2:
 121                 delta = 4;
 122                 break;
 123         case 3:
 124                 delta = 2;
 125                 break;
 126         default:
 127                 delta = 0;
 128                 ath_dbg(common, ATH_DBG_CALIBRATE,
 129                 "Invalid tx-chainmask: %u\n", common->tx_chainmask);
 130         }
 131
 132         power += delta;
 133         return power;
 134 }
 135
 136 static int ar9003_paprd_setup_single_table(struct ath_hw *ah)
 137 {
 138         struct ath_common *common = ath9k_hw_common(ah);
 139         static const u32 ctrl0[3] = {
 140                 AR_PHY_PAPRD_CTRL0_B0,
 141                 AR_PHY_PAPRD_CTRL0_B1,
 142                 AR_PHY_PAPRD_CTRL0_B2
 143         };
 144         static const u32 ctrl1[3] = {
 145                 AR_PHY_PAPRD_CTRL1_B0,
 146                 AR_PHY_PAPRD_CTRL1_B1,
 147                 AR_PHY_PAPRD_CTRL1_B2
 148         };
 149         int training_power;
 150         int i;
 151
 152         if (IS_CHAN_2GHZ(ah->curchan))
 153                 training_power = ar9003_get_training_power_2g(ah);
 154         else
 155                 training_power = ar9003_get_training_power_5g(ah);
 156
 157         ath_dbg(common, ATH_DBG_CALIBRATE,
 158                 "Training power: %d, Target power: %d\n",
 159                 training_power, ah->paprd_target_power);
 160
 161         if (training_power < 0) {
 162                 ath_dbg(common, ATH_DBG_CALIBRATE,
 163                         "PAPRD target power delta out of range");
 164                 return -ERANGE;
 165         }
 166         ah->paprd_training_power = training_power;
 167
 168         REG_RMW_FIELD(ah, AR_PHY_PAPRD_AM2AM, AR_PHY_PAPRD_AM2AM_MASK,
 169                       ah->paprd_ratemask);
 170         REG_RMW_FIELD(ah, AR_PHY_PAPRD_AM2PM, AR_PHY_PAPRD_AM2PM_MASK,
 171                       ah->paprd_ratemask);
 172         REG_RMW_FIELD(ah, AR_PHY_PAPRD_HT40, AR_PHY_PAPRD_HT40_MASK,
 173                       ah->paprd_ratemask_ht40);
 174
 175         for (i = 0; i < ah->caps.max_txchains; i++) {
 176                 REG_RMW_FIELD(ah, ctrl0[i],
 177                               AR_PHY_PAPRD_CTRL0_USE_SINGLE_TABLE_MASK, 1);
 178                 REG_RMW_FIELD(ah, ctrl1[i],
 179                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_AM2PM_ENABLE, 1);
 180                 REG_RMW_FIELD(ah, ctrl1[i],
 181                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_AM2AM_ENABLE, 1);
 182                 REG_RMW_FIELD(ah, ctrl1[i],
 183                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_SCALING_ENA, 0);
 184                 REG_RMW_FIELD(ah, ctrl1[i],
 185                               AR_PHY_PAPRD_CTRL1_PA_GAIN_SCALE_FACT_MASK, 181);
 186                 REG_RMW_FIELD(ah, ctrl1[i],
 187                               AR_PHY_PAPRD_CTRL1_PAPRD_MAG_SCALE_FACT, 361);
 188                 REG_RMW_FIELD(ah, ctrl1[i],
 189                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_SCALING_ENA, 0);
 190                 REG_RMW_FIELD(ah, ctrl0[i],
 191                               AR_PHY_PAPRD_CTRL0_PAPRD_MAG_THRSH, 3);
 192         }
 193
 194         ar9003_paprd_enable(ah, false);
 195
 196         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 197                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_LB_SKIP, 0x30);
 198         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 199                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_LB_ENABLE, 1);
 200         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 201                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_TX_GAIN_FORCE, 1);
 202         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 203                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_RX_BB_GAIN_FORCE, 0);
 204         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 205                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_IQCORR_ENABLE, 0);
 206         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 207                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_AGC2_SETTLING, 28);
 208         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 209                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_CF_PAPRD_TRAIN_ENABLE, 1);
 210         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL2,
 211                       AR_PHY_PAPRD_TRAINER_CNTL2_CF_PAPRD_INIT_RX_BB_GAIN, 147);
 212         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 213                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_FINE_CORR_LEN, 4);
 214         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 215                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_COARSE_CORR_LEN, 4);
 216         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 217                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_NUM_CORR_STAGES, 7);
 218         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 219                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_MIN_LOOPBACK_DEL, 1);
 220         if (AR_SREV_9485(ah))
 221                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 222                               AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
 223                               -3);
 224         else
 225                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 226                               AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
 227                               -6);
 228         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 229                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_ADC_DESIRED_SIZE,
 230                       -15);
 231         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 232                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_BBTXMIX_DISABLE, 1);
 233         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
 234                       AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_SAFETY_DELTA, 0);
 235         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
 236                       AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_MIN_CORR, 400);
 237         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
 238                       AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_NUM_TRAIN_SAMPLES,
 239                       100);
 240         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_0_B0,
 241                       AR_PHY_PAPRD_PRE_POST_SCALING, 261376);
 242         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_1_B0,
 243                       AR_PHY_PAPRD_PRE_POST_SCALING, 248079);
 244         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_2_B0,
 245                       AR_PHY_PAPRD_PRE_POST_SCALING, 233759);
 246         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_3_B0,
 247                       AR_PHY_PAPRD_PRE_POST_SCALING, 220464);
 248         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_4_B0,
 249                       AR_PHY_PAPRD_PRE_POST_SCALING, 208194);
 250         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_5_B0,
 251                       AR_PHY_PAPRD_PRE_POST_SCALING, 196949);
 252         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_6_B0,
 253                       AR_PHY_PAPRD_PRE_POST_SCALING, 185706);
 254         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_7_B0,
 255                       AR_PHY_PAPRD_PRE_POST_SCALING, 175487);
 256         return 0;
 257 }
 258
 259 static void ar9003_paprd_get_gain_table(struct ath_hw *ah)
 260 {
 261         u32 *entry = ah->paprd_gain_table_entries;
 262         u8 *index = ah->paprd_gain_table_index;
 263         u32 reg = AR_PHY_TXGAIN_TABLE;
 264         int i;
 265
 266         memset(entry, 0, sizeof(ah->paprd_gain_table_entries));
 267         memset(index, 0, sizeof(ah->paprd_gain_table_index));
 268
 269         for (i = 0; i < PAPRD_GAIN_TABLE_ENTRIES; i++) {
 270                 entry[i] = REG_READ(ah, reg);
 271                 index[i] = (entry[i] >> 24) & 0xff;
 272                 reg += 4;
 273         }
 274 }
 275
 276 static unsigned int ar9003_get_desired_gain(struct ath_hw *ah, int chain,
 277                                             int target_power)
 278 {
 279         int olpc_gain_delta = 0, cl_gain_mod;
 280         int alpha_therm, alpha_volt;
 281         int therm_cal_value, volt_cal_value;
 282         int therm_value, volt_value;
 283         int thermal_gain_corr, voltage_gain_corr;
 284         int desired_scale, desired_gain = 0;
 285         u32 reg_olpc  = 0, reg_cl_gain  = 0;
 286
 287         REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 288                     AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 289         desired_scale = REG_READ_FIELD(ah, AR_PHY_TPC_12,
 290                                        AR_PHY_TPC_12_DESIRED_SCALE_HT40_5);
 291         alpha_therm = REG_READ_FIELD(ah, AR_PHY_TPC_19,
 292                                      AR_PHY_TPC_19_ALPHA_THERM);
 293         alpha_volt = REG_READ_FIELD(ah, AR_PHY_TPC_19,
 294                                     AR_PHY_TPC_19_ALPHA_VOLT);
 295         therm_cal_value = REG_READ_FIELD(ah, AR_PHY_TPC_18,
 296                                          AR_PHY_TPC_18_THERM_CAL_VALUE);
 297         volt_cal_value = REG_READ_FIELD(ah, AR_PHY_TPC_18,
 298                                         AR_PHY_TPC_18_VOLT_CAL_VALUE);
 299         therm_value = REG_READ_FIELD(ah, AR_PHY_BB_THERM_ADC_4,
 300                                      AR_PHY_BB_THERM_ADC_4_LATEST_THERM_VALUE);
 301         volt_value = REG_READ_FIELD(ah, AR_PHY_BB_THERM_ADC_4,
 302                                     AR_PHY_BB_THERM_ADC_4_LATEST_VOLT_VALUE);
 303
 304         switch (chain) {
 305         case 0:
 306                 reg_olpc = AR_PHY_TPC_11_B0;
 307                 reg_cl_gain = AR_PHY_CL_TAB_0;
 308                 break;
 309         case 1:
 310                 reg_olpc = AR_PHY_TPC_11_B1;
 311                 reg_cl_gain = AR_PHY_CL_TAB_1;
 312                 break;
 313         case 2:
 314                 reg_olpc = AR_PHY_TPC_11_B2;
 315                 reg_cl_gain = AR_PHY_CL_TAB_2;
 316                 break;
 317         default:
 318                 ath_dbg(ath9k_hw_common(ah), ATH_DBG_CALIBRATE,
 319                 "Invalid chainmask: %d\n", chain);
 320                 break;
 321         }
 322
 323         olpc_gain_delta = REG_READ_FIELD(ah, reg_olpc,
 324                                          AR_PHY_TPC_11_OLPC_GAIN_DELTA);
 325         cl_gain_mod = REG_READ_FIELD(ah, reg_cl_gain,
 326                                          AR_PHY_CL_TAB_CL_GAIN_MOD);
 327
 328         if (olpc_gain_delta >= 128)
 329                 olpc_gain_delta = olpc_gain_delta - 256;
 330
 331         thermal_gain_corr = (alpha_therm * (therm_value - therm_cal_value) +
 332                              (256 / 2)) / 256;
 333         voltage_gain_corr = (alpha_volt * (volt_value - volt_cal_value) +
 334                              (128 / 2)) / 128;
 335         desired_gain = target_power - olpc_gain_delta - thermal_gain_corr -
 336             voltage_gain_corr + desired_scale + cl_gain_mod;
 337
 338         return desired_gain;
 339 }
 340
 341 static void ar9003_tx_force_gain(struct ath_hw *ah, unsigned int gain_index)
 342 {
 343         int selected_gain_entry, txbb1dbgain, txbb6dbgain, txmxrgain;
 344         int padrvgnA, padrvgnB, padrvgnC, padrvgnD;
 345         u32 *gain_table_entries = ah->paprd_gain_table_entries;
 346
 347         selected_gain_entry = gain_table_entries[gain_index];
 348         txbb1dbgain = selected_gain_entry & 0x7;
 349         txbb6dbgain = (selected_gain_entry >> 3) & 0x3;
 350         txmxrgain = (selected_gain_entry >> 5) & 0xf;
 351         padrvgnA = (selected_gain_entry >> 9) & 0xf;
 352         padrvgnB = (selected_gain_entry >> 13) & 0xf;
 353         padrvgnC = (selected_gain_entry >> 17) & 0xf;
 354         padrvgnD = (selected_gain_entry >> 21) & 0x3;
 355
 356         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 357                       AR_PHY_TX_FORCED_GAIN_FORCED_TXBB1DBGAIN, txbb1dbgain);
 358         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 359                       AR_PHY_TX_FORCED_GAIN_FORCED_TXBB6DBGAIN, txbb6dbgain);
 360         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 361                       AR_PHY_TX_FORCED_GAIN_FORCED_TXMXRGAIN, txmxrgain);
 362         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 363                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNA, padrvgnA);
 364         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 365                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNB, padrvgnB);
 366         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 367                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNC, padrvgnC);
 368         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 369                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGND, padrvgnD);
 370         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 371                       AR_PHY_TX_FORCED_GAIN_FORCED_ENABLE_PAL, 0);
 372         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 373                       AR_PHY_TX_FORCED_GAIN_FORCE_TX_GAIN, 0);
 374         REG_RMW_FIELD(ah, AR_PHY_TPC_1, AR_PHY_TPC_1_FORCED_DAC_GAIN, 0);
 375         REG_RMW_FIELD(ah, AR_PHY_TPC_1, AR_PHY_TPC_1_FORCE_DAC_GAIN, 0);
 376 }
 377
 378 static inline int find_expn(int num)
 379 {
 380         return fls(num) - 1;
 381 }
 382
 383 static inline int find_proper_scale(int expn, int N)
 384 {
 385         return (expn > N) ? expn - 10 : 0;
 386 }
 387
 388 #define NUM_BIN 23
 389
 390 static bool create_pa_curve(u32 *data_L, u32 *data_U, u32 *pa_table, u16 *gain)
 391 {
 392         unsigned int thresh_accum_cnt;
 393         int x_est[NUM_BIN + 1], Y[NUM_BIN + 1], theta[NUM_BIN + 1];
 394         int PA_in[NUM_BIN + 1];
 395         int B1_tmp[NUM_BIN + 1], B2_tmp[NUM_BIN + 1];
 396         unsigned int B1_abs_max, B2_abs_max;
 397         int max_index, scale_factor;
 398         int y_est[NUM_BIN + 1];
 399         int x_est_fxp1_nonlin, x_tilde[NUM_BIN + 1];
 400         unsigned int x_tilde_abs;
 401         int G_fxp, Y_intercept, order_x_by_y, M, I, L, sum_y_sqr, sum_y_quad;
 402         int Q_x, Q_B1, Q_B2, beta_raw, alpha_raw, scale_B;
 403         int Q_scale_B, Q_beta, Q_alpha, alpha, beta, order_1, order_2;
 404         int order1_5x, order2_3x, order1_5x_rem, order2_3x_rem;
 405         int y5, y3, tmp;
 406         int theta_low_bin = 0;
 407         int i;
 408
 409         /* disregard any bin that contains <= 16 samples */
 410         thresh_accum_cnt = 16;
 411         scale_factor = 5;
 412         max_index = 0;
 413         memset(theta, 0, sizeof(theta));
 414         memset(x_est, 0, sizeof(x_est));
 415         memset(Y, 0, sizeof(Y));
 416         memset(y_est, 0, sizeof(y_est));
 417         memset(x_tilde, 0, sizeof(x_tilde));
 418
 419         for (i = 0; i < NUM_BIN; i++) {
 420                 s32 accum_cnt, accum_tx, accum_rx, accum_ang;
 421
 422                 /* number of samples */
 423                 accum_cnt = data_L[i] & 0xffff;
 424
 425                 if (accum_cnt <= thresh_accum_cnt)
 426                         continue;
 427
 428                 /* sum(tx amplitude) */
 429                 accum_tx = ((data_L[i] >> 16) & 0xffff) |
 430                     ((data_U[i] & 0x7ff) << 16);
 431
 432                 /* sum(rx amplitude distance to lower bin edge) */
 433                 accum_rx = ((data_U[i] >> 11) & 0x1f) |
 434                     ((data_L[i + 23] & 0xffff) << 5);
 435
 436                 /* sum(angles) */
 437                 accum_ang = ((data_L[i + 23] >> 16) & 0xffff) |
 438                     ((data_U[i + 23] & 0x7ff) << 16);
 439
 440                 accum_tx <<= scale_factor;
 441                 accum_rx <<= scale_factor;
 442                 x_est[i + 1] = (((accum_tx + accum_cnt) / accum_cnt) + 32) >>
 443                     scale_factor;
 444
 445                 Y[i + 1] = ((((accum_rx + accum_cnt) / accum_cnt) + 32) >>
 446                             scale_factor) +
 447                             (1 << scale_factor) * max_index + 16;
 448
 449                 if (accum_ang >= (1 << 26))
 450                         accum_ang -= 1 << 27;
 451
 452                 theta[i + 1] = ((accum_ang * (1 << scale_factor)) + accum_cnt) /
 453                     accum_cnt;
 454
 455                 max_index++;
 456         }
 457
 458         /*
 459          * Find average theta of first 5 bin and all of those to same value.
 460          * Curve is linear at that range.
 461          */
 462         for (i = 1; i < 6; i++)
 463                 theta_low_bin += theta[i];
 464
 465         theta_low_bin = theta_low_bin / 5;
 466         for (i = 1; i < 6; i++)
 467                 theta[i] = theta_low_bin;
 468
 469         /* Set values at origin */
 470         theta[0] = theta_low_bin;
 471         for (i = 0; i <= max_index; i++)
 472                 theta[i] -= theta_low_bin;
 473
 474         x_est[0] = 0;
 475         Y[0] = 0;
 476         scale_factor = 8;
 477
 478         /* low signal gain */
 479         if (x_est[6] == x_est[3])
 480                 return false;
 481
 482         G_fxp =
 483             (((Y[6] - Y[3]) * 1 << scale_factor) +
 484              (x_est[6] - x_est[3])) / (x_est[6] - x_est[3]);
 485
 486         /* prevent division by zero */
 487         if (G_fxp == 0)
 488                 return false;
 489
 490         Y_intercept =
 491             (G_fxp * (x_est[0] - x_est[3]) +
 492              (1 << scale_factor)) / (1 << scale_factor) + Y[3];
 493
 494         for (i = 0; i <= max_index; i++)
 495                 y_est[i] = Y[i] - Y_intercept;
 496
 497         for (i = 0; i <= 3; i++) {
 498                 y_est[i] = i * 32;
 499                 x_est[i] = ((y_est[i] * 1 << scale_factor) + G_fxp) / G_fxp;
 500         }
 501
 502         if (y_est[max_index] == 0)
 503                 return false;
 504
 505         x_est_fxp1_nonlin =
 506             x_est[max_index] - ((1 << scale_factor) * y_est[max_index] +
 507                                 G_fxp) / G_fxp;
 508
 509         order_x_by_y =
 510             (x_est_fxp1_nonlin + y_est[max_index]) / y_est[max_index];
 511
 512         if (order_x_by_y == 0)
 513                 M = 10;
 514         else if (order_x_by_y == 1)
 515                 M = 9;
 516         else
 517                 M = 8;
 518
 519         I = (max_index > 15) ? 7 : max_index >> 1;
 520         L = max_index - I;
 521         scale_factor = 8;
 522         sum_y_sqr = 0;
 523         sum_y_quad = 0;
 524         x_tilde_abs = 0;
 525
 526         for (i = 0; i <= L; i++) {
 527                 unsigned int y_sqr;
 528                 unsigned int y_quad;
 529                 unsigned int tmp_abs;
 530
 531                 /* prevent division by zero */
 532                 if (y_est[i + I] == 0)
 533                         return false;
 534
 535                 x_est_fxp1_nonlin =
 536                     x_est[i + I] - ((1 << scale_factor) * y_est[i + I] +
 537                                     G_fxp) / G_fxp;
 538
 539                 x_tilde[i] =
 540                     (x_est_fxp1_nonlin * (1 << M) + y_est[i + I]) / y_est[i +
 541                                                                           I];
 542                 x_tilde[i] =
 543                     (x_tilde[i] * (1 << M) + y_est[i + I]) / y_est[i + I];
 544                 x_tilde[i] =
 545                     (x_tilde[i] * (1 << M) + y_est[i + I]) / y_est[i + I];
 546                 y_sqr =
 547                     (y_est[i + I] * y_est[i + I] +
 548                      (scale_factor * scale_factor)) / (scale_factor *
 549                                                        scale_factor);
 550                 tmp_abs = abs(x_tilde[i]);
 551                 if (tmp_abs > x_tilde_abs)
 552                         x_tilde_abs = tmp_abs;
 553
 554                 y_quad = y_sqr * y_sqr;
 555                 sum_y_sqr = sum_y_sqr + y_sqr;
 556                 sum_y_quad = sum_y_quad + y_quad;
 557                 B1_tmp[i] = y_sqr * (L + 1);
 558                 B2_tmp[i] = y_sqr;
 559         }
 560
 561         B1_abs_max = 0;
 562         B2_abs_max = 0;
 563         for (i = 0; i <= L; i++) {
 564                 int abs_val;
 565
 566                 B1_tmp[i] -= sum_y_sqr;
 567                 B2_tmp[i] = sum_y_quad - sum_y_sqr * B2_tmp[i];
 568
 569                 abs_val = abs(B1_tmp[i]);
 570                 if (abs_val > B1_abs_max)
 571                         B1_abs_max = abs_val;
 572
 573                 abs_val = abs(B2_tmp[i]);
 574                 if (abs_val > B2_abs_max)
 575                         B2_abs_max = abs_val;
 576         }
 577
 578         Q_x = find_proper_scale(find_expn(x_tilde_abs), 10);
 579         Q_B1 = find_proper_scale(find_expn(B1_abs_max), 10);
 580         Q_B2 = find_proper_scale(find_expn(B2_abs_max), 10);
 581
 582         beta_raw = 0;
 583         alpha_raw = 0;
 584         for (i = 0; i <= L; i++) {
 585                 x_tilde[i] = x_tilde[i] / (1 << Q_x);
 586                 B1_tmp[i] = B1_tmp[i] / (1 << Q_B1);
 587                 B2_tmp[i] = B2_tmp[i] / (1 << Q_B2);
 588                 beta_raw = beta_raw + B1_tmp[i] * x_tilde[i];
 589                 alpha_raw = alpha_raw + B2_tmp[i] * x_tilde[i];
 590         }
 591
 592         scale_B =
 593             ((sum_y_quad / scale_factor) * (L + 1) -
 594              (sum_y_sqr / scale_factor) * sum_y_sqr) * scale_factor;
 595
 596         Q_scale_B = find_proper_scale(find_expn(abs(scale_B)), 10);
 597         scale_B = scale_B / (1 << Q_scale_B);
 598         if (scale_B == 0)
 599                 return false;
 600         Q_beta = find_proper_scale(find_expn(abs(beta_raw)), 10);
 601         Q_alpha = find_proper_scale(find_expn(abs(alpha_raw)), 10);
 602         beta_raw = beta_raw / (1 << Q_beta);
 603         alpha_raw = alpha_raw / (1 << Q_alpha);
 604         alpha = (alpha_raw << 10) / scale_B;
 605         beta = (beta_raw << 10) / scale_B;
 606         order_1 = 3 * M - Q_x - Q_B1 - Q_beta + 10 + Q_scale_B;
 607         order_2 = 3 * M - Q_x - Q_B2 - Q_alpha + 10 + Q_scale_B;
 608         order1_5x = order_1 / 5;
 609         order2_3x = order_2 / 3;
 610         order1_5x_rem = order_1 - 5 * order1_5x;
 611         order2_3x_rem = order_2 - 3 * order2_3x;
 612
 613         for (i = 0; i < PAPRD_TABLE_SZ; i++) {
 614                 tmp = i * 32;
 615                 y5 = ((beta * tmp) >> 6) >> order1_5x;
 616                 y5 = (y5 * tmp) >> order1_5x;
 617                 y5 = (y5 * tmp) >> order1_5x;
 618                 y5 = (y5 * tmp) >> order1_5x;
 619                 y5 = (y5 * tmp) >> order1_5x;
 620                 y5 = y5 >> order1_5x_rem;
 621                 y3 = (alpha * tmp) >> order2_3x;
 622                 y3 = (y3 * tmp) >> order2_3x;
 623                 y3 = (y3 * tmp) >> order2_3x;
 624                 y3 = y3 >> order2_3x_rem;
 625                 PA_in[i] = y5 + y3 + (256 * tmp) / G_fxp;
 626
 627                 if (i >= 2) {
 628                         tmp = PA_in[i] - PA_in[i - 1];
 629                         if (tmp < 0)
 630                                 PA_in[i] =
 631                                     PA_in[i - 1] + (PA_in[i - 1] -
 632                                                     PA_in[i - 2]);
 633                 }
 634
 635                 PA_in[i] = (PA_in[i] < 1400) ? PA_in[i] : 1400;
 636         }
 637
 638         beta_raw = 0;
 639         alpha_raw = 0;
 640
 641         for (i = 0; i <= L; i++) {
 642                 int theta_tilde =
 643                     ((theta[i + I] << M) + y_est[i + I]) / y_est[i + I];
 644                 theta_tilde =
 645                     ((theta_tilde << M) + y_est[i + I]) / y_est[i + I];
 646                 theta_tilde =
 647                     ((theta_tilde << M) + y_est[i + I]) / y_est[i + I];
 648                 beta_raw = beta_raw + B1_tmp[i] * theta_tilde;
 649                 alpha_raw = alpha_raw + B2_tmp[i] * theta_tilde;
 650         }
 651
 652         Q_beta = find_proper_scale(find_expn(abs(beta_raw)), 10);
 653         Q_alpha = find_proper_scale(find_expn(abs(alpha_raw)), 10);
 654         beta_raw = beta_raw / (1 << Q_beta);
 655         alpha_raw = alpha_raw / (1 << Q_alpha);
 656
 657         alpha = (alpha_raw << 10) / scale_B;
 658         beta = (beta_raw << 10) / scale_B;
 659         order_1 = 3 * M - Q_x - Q_B1 - Q_beta + 10 + Q_scale_B + 5;
 660         order_2 = 3 * M - Q_x - Q_B2 - Q_alpha + 10 + Q_scale_B + 5;
 661         order1_5x = order_1 / 5;
 662         order2_3x = order_2 / 3;
 663         order1_5x_rem = order_1 - 5 * order1_5x;
 664         order2_3x_rem = order_2 - 3 * order2_3x;
 665
 666         for (i = 0; i < PAPRD_TABLE_SZ; i++) {
 667                 int PA_angle;
 668
 669                 /* pa_table[4] is calculated from PA_angle for i=5 */
 670                 if (i == 4)
 671                         continue;
 672
 673                 tmp = i * 32;
 674                 if (beta > 0)
 675                         y5 = (((beta * tmp - 64) >> 6) -
 676                               (1 << order1_5x)) / (1 << order1_5x);
 677                 else
 678                         y5 = ((((beta * tmp - 64) >> 6) +
 679                                (1 << order1_5x)) / (1 << order1_5x));
 680
 681                 y5 = (y5 * tmp) / (1 << order1_5x);
 682                 y5 = (y5 * tmp) / (1 << order1_5x);
 683                 y5 = (y5 * tmp) / (1 << order1_5x);
 684                 y5 = (y5 * tmp) / (1 << order1_5x);
 685                 y5 = y5 / (1 << order1_5x_rem);
 686
 687                 if (beta > 0)
 688                         y3 = (alpha * tmp -
 689                               (1 << order2_3x)) / (1 << order2_3x);
 690                 else
 691                         y3 = (alpha * tmp +
 692                               (1 << order2_3x)) / (1 << order2_3x);
 693                 y3 = (y3 * tmp) / (1 << order2_3x);
 694                 y3 = (y3 * tmp) / (1 << order2_3x);
 695                 y3 = y3 / (1 << order2_3x_rem);
 696
 697                 if (i < 4) {
 698                         PA_angle = 0;
 699                 } else {
 700                         PA_angle = y5 + y3;
 701                         if (PA_angle < -150)
 702                                 PA_angle = -150;
 703                         else if (PA_angle > 150)
 704                                 PA_angle = 150;
 705                 }
 706
 707                 pa_table[i] = ((PA_in[i] & 0x7ff) << 11) + (PA_angle & 0x7ff);
 708                 if (i == 5) {
 709                         PA_angle = (PA_angle + 2) >> 1;
 710                         pa_table[i - 1] = ((PA_in[i - 1] & 0x7ff) << 11) +
 711                             (PA_angle & 0x7ff);
 712                 }
 713         }
 714
 715         *gain = G_fxp;
 716         return true;
 717 }
 718
 719 void ar9003_paprd_populate_single_table(struct ath_hw *ah,
 720                                         struct ath9k_hw_cal_data *caldata,
 721                                         int chain)
 722 {
 723         u32 *paprd_table_val = caldata->pa_table[chain];
 724         u32 small_signal_gain = caldata->small_signal_gain[chain];
 725         u32 training_power = ah->paprd_training_power;
 726         u32 reg = 0;
 727         int i;
 728
 729         if (chain == 0)
 730                 reg = AR_PHY_PAPRD_MEM_TAB_B0;
 731         else if (chain == 1)
 732                 reg = AR_PHY_PAPRD_MEM_TAB_B1;
 733         else if (chain == 2)
 734                 reg = AR_PHY_PAPRD_MEM_TAB_B2;
 735
 736         for (i = 0; i < PAPRD_TABLE_SZ; i++) {
 737                 REG_WRITE(ah, reg, paprd_table_val[i]);
 738                 reg = reg + 4;
 739         }
 740
 741         if (chain == 0)
 742                 reg = AR_PHY_PA_GAIN123_B0;
 743         else if (chain == 1)
 744                 reg = AR_PHY_PA_GAIN123_B1;
 745         else
 746                 reg = AR_PHY_PA_GAIN123_B2;
 747
 748         REG_RMW_FIELD(ah, reg, AR_PHY_PA_GAIN123_PA_GAIN1, small_signal_gain);
 749
 750         REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B0,
 751                       AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
 752                       training_power);
 753
 754         if (ah->caps.tx_chainmask & BIT(1))
 755                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B1,
 756                               AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
 757                               training_power);
 758
 759         if (ah->caps.tx_chainmask & BIT(2))
 760                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B2,
 761                               AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
 762                               training_power);
 763 }
 764 EXPORT_SYMBOL(ar9003_paprd_populate_single_table);
 765
 766 int ar9003_paprd_setup_gain_table(struct ath_hw *ah, int chain)
 767 {
 768         unsigned int i, desired_gain, gain_index;
 769         unsigned int train_power = ah->paprd_training_power;
 770
 771         desired_gain = ar9003_get_desired_gain(ah, chain, train_power);
 772
 773         gain_index = 0;
 774         for (i = 0; i < PAPRD_GAIN_TABLE_ENTRIES; i++) {
 775                 if (ah->paprd_gain_table_index[i] >= desired_gain)
 776                         break;
 777                 gain_index++;
 778         }
 779
 780         ar9003_tx_force_gain(ah, gain_index);
 781
 782         REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 783                         AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 784
 785         return 0;
 786 }
 787 EXPORT_SYMBOL(ar9003_paprd_setup_gain_table);
 788
 789 int ar9003_paprd_create_curve(struct ath_hw *ah,
 790                               struct ath9k_hw_cal_data *caldata, int chain)
 791 {
 792         u16 *small_signal_gain = &caldata->small_signal_gain[chain];
 793         u32 *pa_table = caldata->pa_table[chain];
 794         u32 *data_L, *data_U;
 795         int i, status = 0;
 796         u32 *buf;
 797         u32 reg;
 798
 799         memset(caldata->pa_table[chain], 0, sizeof(caldata->pa_table[chain]));
 800
 801         buf = kmalloc(2 * 48 * sizeof(u32), GFP_ATOMIC);
 802         if (!buf)
 803                 return -ENOMEM;
 804
 805         data_L = &buf[0];
 806         data_U = &buf[48];
 807
 808         REG_CLR_BIT(ah, AR_PHY_CHAN_INFO_MEMORY,
 809                     AR_PHY_CHAN_INFO_MEMORY_CHANINFOMEM_S2_READ);
 810
 811         reg = AR_PHY_CHAN_INFO_TAB_0;
 812         for (i = 0; i < 48; i++)
 813                 data_L[i] = REG_READ(ah, reg + (i << 2));
 814
 815         REG_SET_BIT(ah, AR_PHY_CHAN_INFO_MEMORY,
 816                     AR_PHY_CHAN_INFO_MEMORY_CHANINFOMEM_S2_READ);
 817
 818         for (i = 0; i < 48; i++)
 819                 data_U[i] = REG_READ(ah, reg + (i << 2));
 820
 821         if (!create_pa_curve(data_L, data_U, pa_table, small_signal_gain))
 822                 status = -2;
 823
 824         REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 825                     AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 826
 827         kfree(buf);
 828
 829         return status;
 830 }
 831 EXPORT_SYMBOL(ar9003_paprd_create_curve);
 832
 833 int ar9003_paprd_init_table(struct ath_hw *ah)
 834 {
 835         int ret;
 836
 837         ret = ar9003_paprd_setup_single_table(ah);
 838         if (ret < 0)
 839             return ret;
 840
 841         ar9003_paprd_get_gain_table(ah);
 842         return 0;
 843 }
 844 EXPORT_SYMBOL(ar9003_paprd_init_table);
 845
 846 bool ar9003_paprd_is_done(struct ath_hw *ah)
 847 {
 848         int paprd_done, agc2_pwr;
 849         paprd_done = REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 850                                 AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 851
 852         if (paprd_done == 0x1) {
 853                 agc2_pwr = REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 854                                 AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_AGC2_PWR);
 855
 856                 ath_dbg(ath9k_hw_common(ah), ATH_DBG_CALIBRATE,
 857                         "AGC2_PWR = 0x%x training done = 0x%x\n",
 858                         agc2_pwr, paprd_done);
 859         /*
 860          * agc2_pwr range should not be less than 'IDEAL_AGC2_PWR_CHANGE'
 861          * when the training is completely done, otherwise retraining is
 862          * done to make sure the value is in ideal range
 863          */
 864                 if (agc2_pwr <= PAPRD_IDEAL_AGC2_PWR_RANGE)
 865                         paprd_done = 0;
 866         }
 867
 868         return !!paprd_done;
 869 }
 870 EXPORT_SYMBOL(ar9003_paprd_is_done);