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

   1 /*
   2  * Copyright (c) 2010 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
  25         if (val) {
  26                 ah->paprd_table_write_done = true;
  27
  28                 ah->eep_ops->set_txpower(ah, chan,
  29                                 ath9k_regd_get_ctl(regulatory, chan),
  30                                 chan->chan->max_antenna_gain * 2,
  31                                 chan->chan->max_power * 2,
  32                                 min((u32) MAX_RATE_POWER,
  33                                 (u32) regulatory->power_limit), false);
  34         }
  35
  36         REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B0,
  37                       AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
  38         if (ah->caps.tx_chainmask & BIT(1))
  39                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B1,
  40                               AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
  41         if (ah->caps.tx_chainmask & BIT(2))
  42                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B2,
  43                               AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
  44 }
  45 EXPORT_SYMBOL(ar9003_paprd_enable);
  46
  47 static int ar9003_get_training_power_2g(struct ath_hw *ah)
  48 {
  49         struct ar9300_eeprom *eep = &ah->eeprom.ar9300_eep;
  50         struct ar9300_modal_eep_header *hdr = &eep->modalHeader2G;
  51         unsigned int power, scale, delta;
  52
  53         scale = MS(le32_to_cpu(hdr->papdRateMaskHt20), AR9300_PAPRD_SCALE_1);
  54         power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE5,
  55                                AR_PHY_POWERTX_RATE5_POWERTXHT20_0);
  56
  57         delta = abs((int) ah->paprd_target_power - (int) power);
  58         if (delta > scale)
  59                 return -1;
  60
  61         if (delta < 4)
  62                 power -= 4 - delta;
  63
  64         return power;
  65 }
  66
  67 static int ar9003_get_training_power_5g(struct ath_hw *ah)
  68 {
  69         struct ath_common *common = ath9k_hw_common(ah);
  70         struct ar9300_eeprom *eep = &ah->eeprom.ar9300_eep;
  71         struct ar9300_modal_eep_header *hdr = &eep->modalHeader5G;
  72         struct ath9k_channel *chan = ah->curchan;
  73         unsigned int power, scale, delta;
  74
  75         if (chan->channel >= 5700)
  76                 scale = MS(le32_to_cpu(hdr->papdRateMaskHt20),
  77                            AR9300_PAPRD_SCALE_1);
  78         else if (chan->channel >= 5400)
  79                 scale = MS(le32_to_cpu(hdr->papdRateMaskHt40),
  80                            AR9300_PAPRD_SCALE_2);
  81         else
  82                 scale = MS(le32_to_cpu(hdr->papdRateMaskHt40),
  83                            AR9300_PAPRD_SCALE_1);
  84
  85         if (IS_CHAN_HT40(chan))
  86                 power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE8,
  87                         AR_PHY_POWERTX_RATE8_POWERTXHT40_5);
  88         else
  89                 power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE6,
  90                         AR_PHY_POWERTX_RATE6_POWERTXHT20_5);
  91
  92         power += scale;
  93         delta = abs((int) ah->paprd_target_power - (int) power);
  94         if (delta > scale)
  95                 return -1;
  96
  97         power += 2 * get_streams(common->tx_chainmask);
  98         return power;
  99 }
 100
 101 static int ar9003_paprd_setup_single_table(struct ath_hw *ah)
 102 {
 103         struct ath_common *common = ath9k_hw_common(ah);
 104         static const u32 ctrl0[3] = {
 105                 AR_PHY_PAPRD_CTRL0_B0,
 106                 AR_PHY_PAPRD_CTRL0_B1,
 107                 AR_PHY_PAPRD_CTRL0_B2
 108         };
 109         static const u32 ctrl1[3] = {
 110                 AR_PHY_PAPRD_CTRL1_B0,
 111                 AR_PHY_PAPRD_CTRL1_B1,
 112                 AR_PHY_PAPRD_CTRL1_B2
 113         };
 114         int training_power;
 115         int i;
 116
 117         if (IS_CHAN_2GHZ(ah->curchan))
 118                 training_power = ar9003_get_training_power_2g(ah);
 119         else
 120                 training_power = ar9003_get_training_power_5g(ah);
 121
 122         if (training_power < 0) {
 123                 ath_dbg(common, ATH_DBG_CALIBRATE,
 124                         "PAPRD target power delta out of range");
 125                 return -ERANGE;
 126         }
 127         ah->paprd_training_power = training_power;
 128         ath_dbg(common, ATH_DBG_CALIBRATE,
 129                 "Training power: %d, Target power: %d\n",
 130                 ah->paprd_training_power, ah->paprd_target_power);
 131
 132         REG_RMW_FIELD(ah, AR_PHY_PAPRD_AM2AM, AR_PHY_PAPRD_AM2AM_MASK,
 133                       ah->paprd_ratemask);
 134         REG_RMW_FIELD(ah, AR_PHY_PAPRD_AM2PM, AR_PHY_PAPRD_AM2PM_MASK,
 135                       ah->paprd_ratemask);
 136         REG_RMW_FIELD(ah, AR_PHY_PAPRD_HT40, AR_PHY_PAPRD_HT40_MASK,
 137                       ah->paprd_ratemask_ht40);
 138
 139         for (i = 0; i < ah->caps.max_txchains; i++) {
 140                 REG_RMW_FIELD(ah, ctrl0[i],
 141                               AR_PHY_PAPRD_CTRL0_USE_SINGLE_TABLE_MASK, 1);
 142                 REG_RMW_FIELD(ah, ctrl1[i],
 143                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_AM2PM_ENABLE, 1);
 144                 REG_RMW_FIELD(ah, ctrl1[i],
 145                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_AM2AM_ENABLE, 1);
 146                 REG_RMW_FIELD(ah, ctrl1[i],
 147                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_SCALING_ENA, 0);
 148                 REG_RMW_FIELD(ah, ctrl1[i],
 149                               AR_PHY_PAPRD_CTRL1_PA_GAIN_SCALE_FACT_MASK, 181);
 150                 REG_RMW_FIELD(ah, ctrl1[i],
 151                               AR_PHY_PAPRD_CTRL1_PAPRD_MAG_SCALE_FACT, 361);
 152                 REG_RMW_FIELD(ah, ctrl1[i],
 153                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_SCALING_ENA, 0);
 154                 REG_RMW_FIELD(ah, ctrl0[i],
 155                               AR_PHY_PAPRD_CTRL0_PAPRD_MAG_THRSH, 3);
 156         }
 157
 158         ar9003_paprd_enable(ah, false);
 159
 160         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 161                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_LB_SKIP, 0x30);
 162         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 163                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_LB_ENABLE, 1);
 164         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 165                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_TX_GAIN_FORCE, 1);
 166         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 167                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_RX_BB_GAIN_FORCE, 0);
 168         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 169                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_IQCORR_ENABLE, 0);
 170         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 171                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_AGC2_SETTLING, 28);
 172         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 173                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_CF_PAPRD_TRAIN_ENABLE, 1);
 174         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL2,
 175                       AR_PHY_PAPRD_TRAINER_CNTL2_CF_PAPRD_INIT_RX_BB_GAIN, 147);
 176         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 177                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_FINE_CORR_LEN, 4);
 178         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 179                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_COARSE_CORR_LEN, 4);
 180         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 181                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_NUM_CORR_STAGES, 7);
 182         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 183                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_MIN_LOOPBACK_DEL, 1);
 184         if (AR_SREV_9485(ah))
 185                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 186                               AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
 187                               -3);
 188         else
 189                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 190                               AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
 191                               -6);
 192         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 193                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_ADC_DESIRED_SIZE,
 194                       -15);
 195         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 196                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_BBTXMIX_DISABLE, 1);
 197         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
 198                       AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_SAFETY_DELTA, 0);
 199         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
 200                       AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_MIN_CORR, 400);
 201         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
 202                       AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_NUM_TRAIN_SAMPLES,
 203                       100);
 204         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_0_B0,
 205                       AR_PHY_PAPRD_PRE_POST_SCALING, 261376);
 206         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_1_B0,
 207                       AR_PHY_PAPRD_PRE_POST_SCALING, 248079);
 208         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_2_B0,
 209                       AR_PHY_PAPRD_PRE_POST_SCALING, 233759);
 210         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_3_B0,
 211                       AR_PHY_PAPRD_PRE_POST_SCALING, 220464);
 212         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_4_B0,
 213                       AR_PHY_PAPRD_PRE_POST_SCALING, 208194);
 214         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_5_B0,
 215                       AR_PHY_PAPRD_PRE_POST_SCALING, 196949);
 216         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_6_B0,
 217                       AR_PHY_PAPRD_PRE_POST_SCALING, 185706);
 218         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_7_B0,
 219                       AR_PHY_PAPRD_PRE_POST_SCALING, 175487);
 220         return 0;
 221 }
 222
 223 static void ar9003_paprd_get_gain_table(struct ath_hw *ah)
 224 {
 225         u32 *entry = ah->paprd_gain_table_entries;
 226         u8 *index = ah->paprd_gain_table_index;
 227         u32 reg = AR_PHY_TXGAIN_TABLE;
 228         int i;
 229
 230         memset(entry, 0, sizeof(ah->paprd_gain_table_entries));
 231         memset(index, 0, sizeof(ah->paprd_gain_table_index));
 232
 233         for (i = 0; i < 32; i++) {
 234                 entry[i] = REG_READ(ah, reg);
 235                 index[i] = (entry[i] >> 24) & 0xff;
 236                 reg += 4;
 237         }
 238 }
 239
 240 static unsigned int ar9003_get_desired_gain(struct ath_hw *ah, int chain,
 241                                             int target_power)
 242 {
 243         int olpc_gain_delta = 0;
 244         int alpha_therm, alpha_volt;
 245         int therm_cal_value, volt_cal_value;
 246         int therm_value, volt_value;
 247         int thermal_gain_corr, voltage_gain_corr;
 248         int desired_scale, desired_gain = 0;
 249         u32 reg;
 250
 251         REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 252                     AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 253         desired_scale = REG_READ_FIELD(ah, AR_PHY_TPC_12,
 254                                        AR_PHY_TPC_12_DESIRED_SCALE_HT40_5);
 255         alpha_therm = REG_READ_FIELD(ah, AR_PHY_TPC_19,
 256                                      AR_PHY_TPC_19_ALPHA_THERM);
 257         alpha_volt = REG_READ_FIELD(ah, AR_PHY_TPC_19,
 258                                     AR_PHY_TPC_19_ALPHA_VOLT);
 259         therm_cal_value = REG_READ_FIELD(ah, AR_PHY_TPC_18,
 260                                          AR_PHY_TPC_18_THERM_CAL_VALUE);
 261         volt_cal_value = REG_READ_FIELD(ah, AR_PHY_TPC_18,
 262                                         AR_PHY_TPC_18_VOLT_CAL_VALUE);
 263         therm_value = REG_READ_FIELD(ah, AR_PHY_BB_THERM_ADC_4,
 264                                      AR_PHY_BB_THERM_ADC_4_LATEST_THERM_VALUE);
 265         volt_value = REG_READ_FIELD(ah, AR_PHY_BB_THERM_ADC_4,
 266                                     AR_PHY_BB_THERM_ADC_4_LATEST_VOLT_VALUE);
 267
 268         if (chain == 0)
 269                 reg = AR_PHY_TPC_11_B0;
 270         else if (chain == 1)
 271                 reg = AR_PHY_TPC_11_B1;
 272         else
 273                 reg = AR_PHY_TPC_11_B2;
 274
 275         olpc_gain_delta = REG_READ_FIELD(ah, reg,
 276                                          AR_PHY_TPC_11_OLPC_GAIN_DELTA);
 277
 278         if (olpc_gain_delta >= 128)
 279                 olpc_gain_delta = olpc_gain_delta - 256;
 280
 281         thermal_gain_corr = (alpha_therm * (therm_value - therm_cal_value) +
 282                              (256 / 2)) / 256;
 283         voltage_gain_corr = (alpha_volt * (volt_value - volt_cal_value) +
 284                              (128 / 2)) / 128;
 285         desired_gain = target_power - olpc_gain_delta - thermal_gain_corr -
 286             voltage_gain_corr + desired_scale;
 287
 288         return desired_gain;
 289 }
 290
 291 static void ar9003_tx_force_gain(struct ath_hw *ah, unsigned int gain_index)
 292 {
 293         int selected_gain_entry, txbb1dbgain, txbb6dbgain, txmxrgain;
 294         int padrvgnA, padrvgnB, padrvgnC, padrvgnD;
 295         u32 *gain_table_entries = ah->paprd_gain_table_entries;
 296
 297         selected_gain_entry = gain_table_entries[gain_index];
 298         txbb1dbgain = selected_gain_entry & 0x7;
 299         txbb6dbgain = (selected_gain_entry >> 3) & 0x3;
 300         txmxrgain = (selected_gain_entry >> 5) & 0xf;
 301         padrvgnA = (selected_gain_entry >> 9) & 0xf;
 302         padrvgnB = (selected_gain_entry >> 13) & 0xf;
 303         padrvgnC = (selected_gain_entry >> 17) & 0xf;
 304         padrvgnD = (selected_gain_entry >> 21) & 0x3;
 305
 306         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 307                       AR_PHY_TX_FORCED_GAIN_FORCED_TXBB1DBGAIN, txbb1dbgain);
 308         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 309                       AR_PHY_TX_FORCED_GAIN_FORCED_TXBB6DBGAIN, txbb6dbgain);
 310         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 311                       AR_PHY_TX_FORCED_GAIN_FORCED_TXMXRGAIN, txmxrgain);
 312         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 313                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNA, padrvgnA);
 314         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 315                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNB, padrvgnB);
 316         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 317                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNC, padrvgnC);
 318         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 319                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGND, padrvgnD);
 320         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 321                       AR_PHY_TX_FORCED_GAIN_FORCED_ENABLE_PAL, 0);
 322         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 323                       AR_PHY_TX_FORCED_GAIN_FORCE_TX_GAIN, 0);
 324         REG_RMW_FIELD(ah, AR_PHY_TPC_1, AR_PHY_TPC_1_FORCED_DAC_GAIN, 0);
 325         REG_RMW_FIELD(ah, AR_PHY_TPC_1, AR_PHY_TPC_1_FORCE_DAC_GAIN, 0);
 326 }
 327
 328 static inline int find_expn(int num)
 329 {
 330         return fls(num) - 1;
 331 }
 332
 333 static inline int find_proper_scale(int expn, int N)
 334 {
 335         return (expn > N) ? expn - 10 : 0;
 336 }
 337
 338 #define NUM_BIN 23
 339
 340 static bool create_pa_curve(u32 *data_L, u32 *data_U, u32 *pa_table, u16 *gain)
 341 {
 342         unsigned int thresh_accum_cnt;
 343         int x_est[NUM_BIN + 1], Y[NUM_BIN + 1], theta[NUM_BIN + 1];
 344         int PA_in[NUM_BIN + 1];
 345         int B1_tmp[NUM_BIN + 1], B2_tmp[NUM_BIN + 1];
 346         unsigned int B1_abs_max, B2_abs_max;
 347         int max_index, scale_factor;
 348         int y_est[NUM_BIN + 1];
 349         int x_est_fxp1_nonlin, x_tilde[NUM_BIN + 1];
 350         unsigned int x_tilde_abs;
 351         int G_fxp, Y_intercept, order_x_by_y, M, I, L, sum_y_sqr, sum_y_quad;
 352         int Q_x, Q_B1, Q_B2, beta_raw, alpha_raw, scale_B;
 353         int Q_scale_B, Q_beta, Q_alpha, alpha, beta, order_1, order_2;
 354         int order1_5x, order2_3x, order1_5x_rem, order2_3x_rem;
 355         int y5, y3, tmp;
 356         int theta_low_bin = 0;
 357         int i;
 358
 359         /* disregard any bin that contains <= 16 samples */
 360         thresh_accum_cnt = 16;
 361         scale_factor = 5;
 362         max_index = 0;
 363         memset(theta, 0, sizeof(theta));
 364         memset(x_est, 0, sizeof(x_est));
 365         memset(Y, 0, sizeof(Y));
 366         memset(y_est, 0, sizeof(y_est));
 367         memset(x_tilde, 0, sizeof(x_tilde));
 368
 369         for (i = 0; i < NUM_BIN; i++) {
 370                 s32 accum_cnt, accum_tx, accum_rx, accum_ang;
 371
 372                 /* number of samples */
 373                 accum_cnt = data_L[i] & 0xffff;
 374
 375                 if (accum_cnt <= thresh_accum_cnt)
 376                         continue;
 377
 378                 /* sum(tx amplitude) */
 379                 accum_tx = ((data_L[i] >> 16) & 0xffff) |
 380                     ((data_U[i] & 0x7ff) << 16);
 381
 382                 /* sum(rx amplitude distance to lower bin edge) */
 383                 accum_rx = ((data_U[i] >> 11) & 0x1f) |
 384                     ((data_L[i + 23] & 0xffff) << 5);
 385
 386                 /* sum(angles) */
 387                 accum_ang = ((data_L[i + 23] >> 16) & 0xffff) |
 388                     ((data_U[i + 23] & 0x7ff) << 16);
 389
 390                 accum_tx <<= scale_factor;
 391                 accum_rx <<= scale_factor;
 392                 x_est[i + 1] = (((accum_tx + accum_cnt) / accum_cnt) + 32) >>
 393                     scale_factor;
 394
 395                 Y[i + 1] = ((((accum_rx + accum_cnt) / accum_cnt) + 32) >>
 396                             scale_factor) +
 397                             (1 << scale_factor) * max_index + 16;
 398
 399                 if (accum_ang >= (1 << 26))
 400                         accum_ang -= 1 << 27;
 401
 402                 theta[i + 1] = ((accum_ang * (1 << scale_factor)) + accum_cnt) /
 403                     accum_cnt;
 404
 405                 max_index++;
 406         }
 407
 408         /*
 409          * Find average theta of first 5 bin and all of those to same value.
 410          * Curve is linear at that range.
 411          */
 412         for (i = 1; i < 6; i++)
 413                 theta_low_bin += theta[i];
 414
 415         theta_low_bin = theta_low_bin / 5;
 416         for (i = 1; i < 6; i++)
 417                 theta[i] = theta_low_bin;
 418
 419         /* Set values at origin */
 420         theta[0] = theta_low_bin;
 421         for (i = 0; i <= max_index; i++)
 422                 theta[i] -= theta_low_bin;
 423
 424         x_est[0] = 0;
 425         Y[0] = 0;
 426         scale_factor = 8;
 427
 428         /* low signal gain */
 429         if (x_est[6] == x_est[3])
 430                 return false;
 431
 432         G_fxp =
 433             (((Y[6] - Y[3]) * 1 << scale_factor) +
 434              (x_est[6] - x_est[3])) / (x_est[6] - x_est[3]);
 435
 436         /* prevent division by zero */
 437         if (G_fxp == 0)
 438                 return false;
 439
 440         Y_intercept =
 441             (G_fxp * (x_est[0] - x_est[3]) +
 442              (1 << scale_factor)) / (1 << scale_factor) + Y[3];
 443
 444         for (i = 0; i <= max_index; i++)
 445                 y_est[i] = Y[i] - Y_intercept;
 446
 447         for (i = 0; i <= 3; i++) {
 448                 y_est[i] = i * 32;
 449                 x_est[i] = ((y_est[i] * 1 << scale_factor) + G_fxp) / G_fxp;
 450         }
 451
 452         if (y_est[max_index] == 0)
 453                 return false;
 454
 455         x_est_fxp1_nonlin =
 456             x_est[max_index] - ((1 << scale_factor) * y_est[max_index] +
 457                                 G_fxp) / G_fxp;
 458
 459         order_x_by_y =
 460             (x_est_fxp1_nonlin + y_est[max_index]) / y_est[max_index];
 461
 462         if (order_x_by_y == 0)
 463                 M = 10;
 464         else if (order_x_by_y == 1)
 465                 M = 9;
 466         else
 467                 M = 8;
 468
 469         I = (max_index > 15) ? 7 : max_index >> 1;
 470         L = max_index - I;
 471         scale_factor = 8;
 472         sum_y_sqr = 0;
 473         sum_y_quad = 0;
 474         x_tilde_abs = 0;
 475
 476         for (i = 0; i <= L; i++) {
 477                 unsigned int y_sqr;
 478                 unsigned int y_quad;
 479                 unsigned int tmp_abs;
 480
 481                 /* prevent division by zero */
 482                 if (y_est[i + I] == 0)
 483                         return false;
 484
 485                 x_est_fxp1_nonlin =
 486                     x_est[i + I] - ((1 << scale_factor) * y_est[i + I] +
 487                                     G_fxp) / G_fxp;
 488
 489                 x_tilde[i] =
 490                     (x_est_fxp1_nonlin * (1 << M) + y_est[i + I]) / y_est[i +
 491                                                                           I];
 492                 x_tilde[i] =
 493                     (x_tilde[i] * (1 << M) + y_est[i + I]) / y_est[i + I];
 494                 x_tilde[i] =
 495                     (x_tilde[i] * (1 << M) + y_est[i + I]) / y_est[i + I];
 496                 y_sqr =
 497                     (y_est[i + I] * y_est[i + I] +
 498                      (scale_factor * scale_factor)) / (scale_factor *
 499                                                        scale_factor);
 500                 tmp_abs = abs(x_tilde[i]);
 501                 if (tmp_abs > x_tilde_abs)
 502                         x_tilde_abs = tmp_abs;
 503
 504                 y_quad = y_sqr * y_sqr;
 505                 sum_y_sqr = sum_y_sqr + y_sqr;
 506                 sum_y_quad = sum_y_quad + y_quad;
 507                 B1_tmp[i] = y_sqr * (L + 1);
 508                 B2_tmp[i] = y_sqr;
 509         }
 510
 511         B1_abs_max = 0;
 512         B2_abs_max = 0;
 513         for (i = 0; i <= L; i++) {
 514                 int abs_val;
 515
 516                 B1_tmp[i] -= sum_y_sqr;
 517                 B2_tmp[i] = sum_y_quad - sum_y_sqr * B2_tmp[i];
 518
 519                 abs_val = abs(B1_tmp[i]);
 520                 if (abs_val > B1_abs_max)
 521                         B1_abs_max = abs_val;
 522
 523                 abs_val = abs(B2_tmp[i]);
 524                 if (abs_val > B2_abs_max)
 525                         B2_abs_max = abs_val;
 526         }
 527
 528         Q_x = find_proper_scale(find_expn(x_tilde_abs), 10);
 529         Q_B1 = find_proper_scale(find_expn(B1_abs_max), 10);
 530         Q_B2 = find_proper_scale(find_expn(B2_abs_max), 10);
 531
 532         beta_raw = 0;
 533         alpha_raw = 0;
 534         for (i = 0; i <= L; i++) {
 535                 x_tilde[i] = x_tilde[i] / (1 << Q_x);
 536                 B1_tmp[i] = B1_tmp[i] / (1 << Q_B1);
 537                 B2_tmp[i] = B2_tmp[i] / (1 << Q_B2);
 538                 beta_raw = beta_raw + B1_tmp[i] * x_tilde[i];
 539                 alpha_raw = alpha_raw + B2_tmp[i] * x_tilde[i];
 540         }
 541
 542         scale_B =
 543             ((sum_y_quad / scale_factor) * (L + 1) -
 544              (sum_y_sqr / scale_factor) * sum_y_sqr) * scale_factor;
 545
 546         Q_scale_B = find_proper_scale(find_expn(abs(scale_B)), 10);
 547         scale_B = scale_B / (1 << Q_scale_B);
 548         if (scale_B == 0)
 549                 return false;
 550         Q_beta = find_proper_scale(find_expn(abs(beta_raw)), 10);
 551         Q_alpha = find_proper_scale(find_expn(abs(alpha_raw)), 10);
 552         beta_raw = beta_raw / (1 << Q_beta);
 553         alpha_raw = alpha_raw / (1 << Q_alpha);
 554         alpha = (alpha_raw << 10) / scale_B;
 555         beta = (beta_raw << 10) / scale_B;
 556         order_1 = 3 * M - Q_x - Q_B1 - Q_beta + 10 + Q_scale_B;
 557         order_2 = 3 * M - Q_x - Q_B2 - Q_alpha + 10 + Q_scale_B;
 558         order1_5x = order_1 / 5;
 559         order2_3x = order_2 / 3;
 560         order1_5x_rem = order_1 - 5 * order1_5x;
 561         order2_3x_rem = order_2 - 3 * order2_3x;
 562
 563         for (i = 0; i < PAPRD_TABLE_SZ; i++) {
 564                 tmp = i * 32;
 565                 y5 = ((beta * tmp) >> 6) >> order1_5x;
 566                 y5 = (y5 * tmp) >> order1_5x;
 567                 y5 = (y5 * tmp) >> order1_5x;
 568                 y5 = (y5 * tmp) >> order1_5x;
 569                 y5 = (y5 * tmp) >> order1_5x;
 570                 y5 = y5 >> order1_5x_rem;
 571                 y3 = (alpha * tmp) >> order2_3x;
 572                 y3 = (y3 * tmp) >> order2_3x;
 573                 y3 = (y3 * tmp) >> order2_3x;
 574                 y3 = y3 >> order2_3x_rem;
 575                 PA_in[i] = y5 + y3 + (256 * tmp) / G_fxp;
 576
 577                 if (i >= 2) {
 578                         tmp = PA_in[i] - PA_in[i - 1];
 579                         if (tmp < 0)
 580                                 PA_in[i] =
 581                                     PA_in[i - 1] + (PA_in[i - 1] -
 582                                                     PA_in[i - 2]);
 583                 }
 584
 585                 PA_in[i] = (PA_in[i] < 1400) ? PA_in[i] : 1400;
 586         }
 587
 588         beta_raw = 0;
 589         alpha_raw = 0;
 590
 591         for (i = 0; i <= L; i++) {
 592                 int theta_tilde =
 593                     ((theta[i + I] << M) + y_est[i + I]) / y_est[i + I];
 594                 theta_tilde =
 595                     ((theta_tilde << M) + y_est[i + I]) / y_est[i + I];
 596                 theta_tilde =
 597                     ((theta_tilde << M) + y_est[i + I]) / y_est[i + I];
 598                 beta_raw = beta_raw + B1_tmp[i] * theta_tilde;
 599                 alpha_raw = alpha_raw + B2_tmp[i] * theta_tilde;
 600         }
 601
 602         Q_beta = find_proper_scale(find_expn(abs(beta_raw)), 10);
 603         Q_alpha = find_proper_scale(find_expn(abs(alpha_raw)), 10);
 604         beta_raw = beta_raw / (1 << Q_beta);
 605         alpha_raw = alpha_raw / (1 << Q_alpha);
 606
 607         alpha = (alpha_raw << 10) / scale_B;
 608         beta = (beta_raw << 10) / scale_B;
 609         order_1 = 3 * M - Q_x - Q_B1 - Q_beta + 10 + Q_scale_B + 5;
 610         order_2 = 3 * M - Q_x - Q_B2 - Q_alpha + 10 + Q_scale_B + 5;
 611         order1_5x = order_1 / 5;
 612         order2_3x = order_2 / 3;
 613         order1_5x_rem = order_1 - 5 * order1_5x;
 614         order2_3x_rem = order_2 - 3 * order2_3x;
 615
 616         for (i = 0; i < PAPRD_TABLE_SZ; i++) {
 617                 int PA_angle;
 618
 619                 /* pa_table[4] is calculated from PA_angle for i=5 */
 620                 if (i == 4)
 621                         continue;
 622
 623                 tmp = i * 32;
 624                 if (beta > 0)
 625                         y5 = (((beta * tmp - 64) >> 6) -
 626                               (1 << order1_5x)) / (1 << order1_5x);
 627                 else
 628                         y5 = ((((beta * tmp - 64) >> 6) +
 629                                (1 << order1_5x)) / (1 << order1_5x));
 630
 631                 y5 = (y5 * tmp) / (1 << order1_5x);
 632                 y5 = (y5 * tmp) / (1 << order1_5x);
 633                 y5 = (y5 * tmp) / (1 << order1_5x);
 634                 y5 = (y5 * tmp) / (1 << order1_5x);
 635                 y5 = y5 / (1 << order1_5x_rem);
 636
 637                 if (beta > 0)
 638                         y3 = (alpha * tmp -
 639                               (1 << order2_3x)) / (1 << order2_3x);
 640                 else
 641                         y3 = (alpha * tmp +
 642                               (1 << order2_3x)) / (1 << order2_3x);
 643                 y3 = (y3 * tmp) / (1 << order2_3x);
 644                 y3 = (y3 * tmp) / (1 << order2_3x);
 645                 y3 = y3 / (1 << order2_3x_rem);
 646
 647                 if (i < 4) {
 648                         PA_angle = 0;
 649                 } else {
 650                         PA_angle = y5 + y3;
 651                         if (PA_angle < -150)
 652                                 PA_angle = -150;
 653                         else if (PA_angle > 150)
 654                                 PA_angle = 150;
 655                 }
 656
 657                 pa_table[i] = ((PA_in[i] & 0x7ff) << 11) + (PA_angle & 0x7ff);
 658                 if (i == 5) {
 659                         PA_angle = (PA_angle + 2) >> 1;
 660                         pa_table[i - 1] = ((PA_in[i - 1] & 0x7ff) << 11) +
 661                             (PA_angle & 0x7ff);
 662                 }
 663         }
 664
 665         *gain = G_fxp;
 666         return true;
 667 }
 668
 669 void ar9003_paprd_populate_single_table(struct ath_hw *ah,
 670                                         struct ath9k_hw_cal_data *caldata,
 671                                         int chain)
 672 {
 673         u32 *paprd_table_val = caldata->pa_table[chain];
 674         u32 small_signal_gain = caldata->small_signal_gain[chain];
 675         u32 training_power = ah->paprd_training_power;
 676         u32 reg = 0;
 677         int i;
 678
 679         if (chain == 0)
 680                 reg = AR_PHY_PAPRD_MEM_TAB_B0;
 681         else if (chain == 1)
 682                 reg = AR_PHY_PAPRD_MEM_TAB_B1;
 683         else if (chain == 2)
 684                 reg = AR_PHY_PAPRD_MEM_TAB_B2;
 685
 686         for (i = 0; i < PAPRD_TABLE_SZ; i++) {
 687                 REG_WRITE(ah, reg, paprd_table_val[i]);
 688                 reg = reg + 4;
 689         }
 690
 691         if (chain == 0)
 692                 reg = AR_PHY_PA_GAIN123_B0;
 693         else if (chain == 1)
 694                 reg = AR_PHY_PA_GAIN123_B1;
 695         else
 696                 reg = AR_PHY_PA_GAIN123_B2;
 697
 698         REG_RMW_FIELD(ah, reg, AR_PHY_PA_GAIN123_PA_GAIN1, small_signal_gain);
 699
 700         REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B0,
 701                       AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
 702                       training_power);
 703
 704         if (ah->caps.tx_chainmask & BIT(1))
 705                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B1,
 706                               AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
 707                               training_power);
 708
 709         if (ah->caps.tx_chainmask & BIT(2))
 710                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B2,
 711                               AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
 712                               training_power);
 713 }
 714 EXPORT_SYMBOL(ar9003_paprd_populate_single_table);
 715
 716 int ar9003_paprd_setup_gain_table(struct ath_hw *ah, int chain)
 717 {
 718         unsigned int i, desired_gain, gain_index;
 719         unsigned int train_power = ah->paprd_training_power;
 720
 721         desired_gain = ar9003_get_desired_gain(ah, chain, train_power);
 722
 723         gain_index = 0;
 724         for (i = 0; i < 32; i++) {
 725                 if (ah->paprd_gain_table_index[i] >= desired_gain)
 726                         break;
 727                 gain_index++;
 728         }
 729
 730         ar9003_tx_force_gain(ah, gain_index);
 731
 732         REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 733                         AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 734
 735         return 0;
 736 }
 737 EXPORT_SYMBOL(ar9003_paprd_setup_gain_table);
 738
 739 int ar9003_paprd_create_curve(struct ath_hw *ah,
 740                               struct ath9k_hw_cal_data *caldata, int chain)
 741 {
 742         u16 *small_signal_gain = &caldata->small_signal_gain[chain];
 743         u32 *pa_table = caldata->pa_table[chain];
 744         u32 *data_L, *data_U;
 745         int i, status = 0;
 746         u32 *buf;
 747         u32 reg;
 748
 749         memset(caldata->pa_table[chain], 0, sizeof(caldata->pa_table[chain]));
 750
 751         buf = kmalloc(2 * 48 * sizeof(u32), GFP_ATOMIC);
 752         if (!buf)
 753                 return -ENOMEM;
 754
 755         data_L = &buf[0];
 756         data_U = &buf[48];
 757
 758         REG_CLR_BIT(ah, AR_PHY_CHAN_INFO_MEMORY,
 759                     AR_PHY_CHAN_INFO_MEMORY_CHANINFOMEM_S2_READ);
 760
 761         reg = AR_PHY_CHAN_INFO_TAB_0;
 762         for (i = 0; i < 48; i++)
 763                 data_L[i] = REG_READ(ah, reg + (i << 2));
 764
 765         REG_SET_BIT(ah, AR_PHY_CHAN_INFO_MEMORY,
 766                     AR_PHY_CHAN_INFO_MEMORY_CHANINFOMEM_S2_READ);
 767
 768         for (i = 0; i < 48; i++)
 769                 data_U[i] = REG_READ(ah, reg + (i << 2));
 770
 771         if (!create_pa_curve(data_L, data_U, pa_table, small_signal_gain))
 772                 status = -2;
 773
 774         REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 775                     AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 776
 777         kfree(buf);
 778
 779         return status;
 780 }
 781 EXPORT_SYMBOL(ar9003_paprd_create_curve);
 782
 783 int ar9003_paprd_init_table(struct ath_hw *ah)
 784 {
 785         int ret;
 786
 787         ret = ar9003_paprd_setup_single_table(ah);
 788         if (ret < 0)
 789             return ret;
 790
 791         ar9003_paprd_get_gain_table(ah);
 792         return 0;
 793 }
 794 EXPORT_SYMBOL(ar9003_paprd_init_table);
 795
 796 bool ar9003_paprd_is_done(struct ath_hw *ah)
 797 {
 798         return !!REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 799                                 AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 800 }
 801 EXPORT_SYMBOL(ar9003_paprd_is_done);