ar9003_paprd.c

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/*
 * Copyright (c) 2010-2011 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/export.h>
#include "hw.h"
#include "ar9003_phy.h"

void ar9003_paprd_enable(struct ath_hw *ah, bool val)
{
    struct ath9k_channel *chan = ah->curchan;
    struct ar9300_eeprom *eep = &ah->eeprom.ar9300_eep;

    /*
     * 3 bits for modalHeader5G.papdRateMaskHt20
     * is used for sub-band disabling of PAPRD.
     * 5G band is divided into 3 sub-bands -- upper,
     * middle, lower.
     * if bit 30 of modalHeader5G.papdRateMaskHt20 is set
     * -- disable PAPRD for upper band 5GHz
     * if bit 29 of modalHeader5G.papdRateMaskHt20 is set
     * -- disable PAPRD for middle band 5GHz
     * if bit 28 of modalHeader5G.papdRateMaskHt20 is set
     * -- disable PAPRD for lower band 5GHz
     */

    if (IS_CHAN_5GHZ(chan)) {
        if (chan->channel >= UPPER_5G_SUB_BAND_START) {
            if (le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20)
                                  & BIT(30))
                val = false;
        } else if (chan->channel >= MID_5G_SUB_BAND_START) {
            if (le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20)
                                  & BIT(29))
                val = false;
        } else {
            if (le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20)
                                  & BIT(28))
                val = false;
        }
    }

    if (val) {
        ah->paprd_table_write_done = true;
        ath9k_hw_apply_txpower(ah, chan, false);
    }

    REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B0,
              AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
    if (ah->caps.tx_chainmask & BIT(1))
        REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B1,
                  AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
    if (ah->caps.tx_chainmask & BIT(2))
        REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B2,
                  AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
}
EXPORT_SYMBOL(ar9003_paprd_enable);

static int ar9003_get_training_power_2g(struct ath_hw *ah)
{
    struct ath9k_channel *chan = ah->curchan;
    unsigned int power, scale, delta;

    scale = ar9003_get_paprd_scale_factor(ah, chan);
    power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE5,
                   AR_PHY_POWERTX_RATE5_POWERTXHT20_0);

    delta = abs((int) ah->paprd_target_power - (int) power);
    if (delta > scale)
        return -1;

    if (delta < 4)
        power -= 4 - delta;

    return power;
}

static int ar9003_get_training_power_5g(struct ath_hw *ah)
{
    struct ath_common *common = ath9k_hw_common(ah);
    struct ath9k_channel *chan = ah->curchan;
    unsigned int power, scale, delta;

    scale = ar9003_get_paprd_scale_factor(ah, chan);

    if (IS_CHAN_HT40(chan))
        power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE8,
            AR_PHY_POWERTX_RATE8_POWERTXHT40_5);
    else
        power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE6,
            AR_PHY_POWERTX_RATE6_POWERTXHT20_5);

    power += scale;
    delta = abs((int) ah->paprd_target_power - (int) power);
    if (delta > scale)
        return -1;

    switch (get_streams(ah->txchainmask)) {
    case 1:
        delta = 6;
        break;
    case 2:
        delta = 4;
        break;
    case 3:
        delta = 2;
        break;
    default:
        delta = 0;
        ath_dbg(common, CALIBRATE, "Invalid tx-chainmask: %u\n",
            ah->txchainmask);
    }

    power += delta;
    return power;
}

static int ar9003_paprd_setup_single_table(struct ath_hw *ah)
{
    struct ath_common *common = ath9k_hw_common(ah);
    static const u32 ctrl0[3] = {
        AR_PHY_PAPRD_CTRL0_B0,
        AR_PHY_PAPRD_CTRL0_B1,
        AR_PHY_PAPRD_CTRL0_B2
    };
    static const u32 ctrl1[3] = {
        AR_PHY_PAPRD_CTRL1_B0,
        AR_PHY_PAPRD_CTRL1_B1,
        AR_PHY_PAPRD_CTRL1_B2
    };
    int training_power;
    int i, val;
    u32 am2pm_mask = ah->paprd_ratemask;

    if (IS_CHAN_2GHZ(ah->curchan))
        training_power = ar9003_get_training_power_2g(ah);
    else
        training_power = ar9003_get_training_power_5g(ah);

    ath_dbg(common, CALIBRATE, "Training power: %d, Target power: %d\n",
        training_power, ah->paprd_target_power);

    if (training_power < 0) {
        ath_dbg(common, CALIBRATE,
            "PAPRD target power delta out of range\n");
        return -ERANGE;
    }
    ah->paprd_training_power = training_power;

    if (AR_SREV_9330(ah))
        am2pm_mask = 0;

    REG_RMW_FIELD(ah, AR_PHY_PAPRD_AM2AM, AR_PHY_PAPRD_AM2AM_MASK,
              ah->paprd_ratemask);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_AM2PM, AR_PHY_PAPRD_AM2PM_MASK,
              am2pm_mask);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_HT40, AR_PHY_PAPRD_HT40_MASK,
              ah->paprd_ratemask_ht40);

    for (i = 0; i < ah->caps.max_txchains; i++) {
        REG_RMW_FIELD(ah, ctrl0[i],
                  AR_PHY_PAPRD_CTRL0_USE_SINGLE_TABLE_MASK, 1);
        REG_RMW_FIELD(ah, ctrl1[i],
                  AR_PHY_PAPRD_CTRL1_ADAPTIVE_AM2PM_ENABLE, 1);
        REG_RMW_FIELD(ah, ctrl1[i],
                  AR_PHY_PAPRD_CTRL1_ADAPTIVE_AM2AM_ENABLE, 1);
        REG_RMW_FIELD(ah, ctrl1[i],
                  AR_PHY_PAPRD_CTRL1_ADAPTIVE_SCALING_ENA, 0);
        REG_RMW_FIELD(ah, ctrl1[i],
                  AR_PHY_PAPRD_CTRL1_PA_GAIN_SCALE_FACT_MASK, 181);
        REG_RMW_FIELD(ah, ctrl1[i],
                  AR_PHY_PAPRD_CTRL1_PAPRD_MAG_SCALE_FACT, 361);
        REG_RMW_FIELD(ah, ctrl1[i],
                  AR_PHY_PAPRD_CTRL1_ADAPTIVE_SCALING_ENA, 0);
        REG_RMW_FIELD(ah, ctrl0[i],
                  AR_PHY_PAPRD_CTRL0_PAPRD_MAG_THRSH, 3);
    }

    ar9003_paprd_enable(ah, false);

    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
              AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_LB_SKIP, 0x30);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
              AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_LB_ENABLE, 1);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
              AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_TX_GAIN_FORCE, 1);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
              AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_RX_BB_GAIN_FORCE, 0);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
              AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_IQCORR_ENABLE, 0);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
              AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_AGC2_SETTLING, 28);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
              AR_PHY_PAPRD_TRAINER_CNTL1_CF_CF_PAPRD_TRAIN_ENABLE, 1);
    val = AR_SREV_9462(ah) ? 0x91 : 147;
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL2,
              AR_PHY_PAPRD_TRAINER_CNTL2_CF_PAPRD_INIT_RX_BB_GAIN, val);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
              AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_FINE_CORR_LEN, 4);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
              AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_COARSE_CORR_LEN, 4);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
              AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_NUM_CORR_STAGES, 7);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
              AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_MIN_LOOPBACK_DEL, 1);
    if (AR_SREV_9485(ah) || AR_SREV_9462(ah) || AR_SREV_9550(ah))
        REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
                  AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
                  -3);
    else
        REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
                  AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
                  -6);
    val = AR_SREV_9462(ah) ? -10 : -15;
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
              AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_ADC_DESIRED_SIZE,
              val);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
              AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_BBTXMIX_DISABLE, 1);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
              AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_SAFETY_DELTA, 0);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
              AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_MIN_CORR, 400);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
              AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_NUM_TRAIN_SAMPLES,
              100);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_0_B0,
              AR_PHY_PAPRD_PRE_POST_SCALING, 261376);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_1_B0,
              AR_PHY_PAPRD_PRE_POST_SCALING, 248079);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_2_B0,
              AR_PHY_PAPRD_PRE_POST_SCALING, 233759);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_3_B0,
              AR_PHY_PAPRD_PRE_POST_SCALING, 220464);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_4_B0,
              AR_PHY_PAPRD_PRE_POST_SCALING, 208194);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_5_B0,
              AR_PHY_PAPRD_PRE_POST_SCALING, 196949);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_6_B0,
              AR_PHY_PAPRD_PRE_POST_SCALING, 185706);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_7_B0,
              AR_PHY_PAPRD_PRE_POST_SCALING, 175487);
    return 0;
}

static void ar9003_paprd_get_gain_table(struct ath_hw *ah)
{
    u32 *entry = ah->paprd_gain_table_entries;
    u8 *index = ah->paprd_gain_table_index;
    u32 reg = AR_PHY_TXGAIN_TABLE;
    int i;

    memset(entry, 0, sizeof(ah->paprd_gain_table_entries));
    memset(index, 0, sizeof(ah->paprd_gain_table_index));

    for (i = 0; i < PAPRD_GAIN_TABLE_ENTRIES; i++) {
        entry[i] = REG_READ(ah, reg);
        index[i] = (entry[i] >> 24) & 0xff;
        reg += 4;
    }
}

static unsigned int ar9003_get_desired_gain(struct ath_hw *ah, int chain,
                        int target_power)
{
    int olpc_gain_delta = 0, cl_gain_mod;
    int alpha_therm, alpha_volt;
    int therm_cal_value, volt_cal_value;
    int therm_value, volt_value;
    int thermal_gain_corr, voltage_gain_corr;
    int desired_scale, desired_gain = 0;
    u32 reg_olpc  = 0, reg_cl_gain  = 0;

    REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
            AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
    desired_scale = REG_READ_FIELD(ah, AR_PHY_TPC_12,
                       AR_PHY_TPC_12_DESIRED_SCALE_HT40_5);
    alpha_therm = REG_READ_FIELD(ah, AR_PHY_TPC_19,
                     AR_PHY_TPC_19_ALPHA_THERM);
    alpha_volt = REG_READ_FIELD(ah, AR_PHY_TPC_19,
                    AR_PHY_TPC_19_ALPHA_VOLT);
    therm_cal_value = REG_READ_FIELD(ah, AR_PHY_TPC_18,
                     AR_PHY_TPC_18_THERM_CAL_VALUE);
    volt_cal_value = REG_READ_FIELD(ah, AR_PHY_TPC_18,
                    AR_PHY_TPC_18_VOLT_CAL_VALUE);
    therm_value = REG_READ_FIELD(ah, AR_PHY_BB_THERM_ADC_4,
                     AR_PHY_BB_THERM_ADC_4_LATEST_THERM_VALUE);
    volt_value = REG_READ_FIELD(ah, AR_PHY_BB_THERM_ADC_4,
                    AR_PHY_BB_THERM_ADC_4_LATEST_VOLT_VALUE);

    switch (chain) {
    case 0:
        reg_olpc = AR_PHY_TPC_11_B0;
        reg_cl_gain = AR_PHY_CL_TAB_0;
        break;
    case 1:
        reg_olpc = AR_PHY_TPC_11_B1;
        reg_cl_gain = AR_PHY_CL_TAB_1;
        break;
    case 2:
        reg_olpc = AR_PHY_TPC_11_B2;
        reg_cl_gain = AR_PHY_CL_TAB_2;
        break;
    default:
        ath_dbg(ath9k_hw_common(ah), CALIBRATE,
            "Invalid chainmask: %d\n", chain);
        break;
    }

    olpc_gain_delta = REG_READ_FIELD(ah, reg_olpc,
                     AR_PHY_TPC_11_OLPC_GAIN_DELTA);
    cl_gain_mod = REG_READ_FIELD(ah, reg_cl_gain,
                     AR_PHY_CL_TAB_CL_GAIN_MOD);

    if (olpc_gain_delta >= 128)
        olpc_gain_delta = olpc_gain_delta - 256;

    thermal_gain_corr = (alpha_therm * (therm_value - therm_cal_value) +
                 (256 / 2)) / 256;
    voltage_gain_corr = (alpha_volt * (volt_value - volt_cal_value) +
                 (128 / 2)) / 128;
    desired_gain = target_power - olpc_gain_delta - thermal_gain_corr -
        voltage_gain_corr + desired_scale + cl_gain_mod;

    return desired_gain;
}

static void ar9003_tx_force_gain(struct ath_hw *ah, unsigned int gain_index)
{
    int selected_gain_entry, txbb1dbgain, txbb6dbgain, txmxrgain;
    int padrvgnA, padrvgnB, padrvgnC, padrvgnD;
    u32 *gain_table_entries = ah->paprd_gain_table_entries;

    selected_gain_entry = gain_table_entries[gain_index];
    txbb1dbgain = selected_gain_entry & 0x7;
    txbb6dbgain = (selected_gain_entry >> 3) & 0x3;
    txmxrgain = (selected_gain_entry >> 5) & 0xf;
    padrvgnA = (selected_gain_entry >> 9) & 0xf;
    padrvgnB = (selected_gain_entry >> 13) & 0xf;
    padrvgnC = (selected_gain_entry >> 17) & 0xf;
    padrvgnD = (selected_gain_entry >> 21) & 0x3;

    REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
              AR_PHY_TX_FORCED_GAIN_FORCED_TXBB1DBGAIN, txbb1dbgain);
    REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
              AR_PHY_TX_FORCED_GAIN_FORCED_TXBB6DBGAIN, txbb6dbgain);
    REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
              AR_PHY_TX_FORCED_GAIN_FORCED_TXMXRGAIN, txmxrgain);
    REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
              AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNA, padrvgnA);
    REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
              AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNB, padrvgnB);
    REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
              AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNC, padrvgnC);
    REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
              AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGND, padrvgnD);
    REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
              AR_PHY_TX_FORCED_GAIN_FORCED_ENABLE_PAL, 0);
    REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
              AR_PHY_TX_FORCED_GAIN_FORCE_TX_GAIN, 0);
    REG_RMW_FIELD(ah, AR_PHY_TPC_1, AR_PHY_TPC_1_FORCED_DAC_GAIN, 0);
    REG_RMW_FIELD(ah, AR_PHY_TPC_1, AR_PHY_TPC_1_FORCE_DAC_GAIN, 0);
}

static inline int find_expn(int num)
{
    return fls(num) - 1;
}

static inline int find_proper_scale(int expn, int N)
{
    return (expn > N) ? expn - 10 : 0;
}

#define NUM_BIN 23

static bool create_pa_curve(u32 *data_L, u32 *data_U, u32 *pa_table, u16 *gain)
{
    unsigned int thresh_accum_cnt;
    int x_est[NUM_BIN + 1], Y[NUM_BIN + 1], theta[NUM_BIN + 1];
    int PA_in[NUM_BIN + 1];
    int B1_tmp[NUM_BIN + 1], B2_tmp[NUM_BIN + 1];
    unsigned int B1_abs_max, B2_abs_max;
    int max_index, scale_factor;
    int y_est[NUM_BIN + 1];
    int x_est_fxp1_nonlin, x_tilde[NUM_BIN + 1];
    unsigned int x_tilde_abs;
    int G_fxp, Y_intercept, order_x_by_y, M, I, L, sum_y_sqr, sum_y_quad;
    int Q_x, Q_B1, Q_B2, beta_raw, alpha_raw, scale_B;
    int Q_scale_B, Q_beta, Q_alpha, alpha, beta, order_1, order_2;
    int order1_5x, order2_3x, order1_5x_rem, order2_3x_rem;
    int y5, y3, tmp;
    int theta_low_bin = 0;
    int i;

    /* disregard any bin that contains <= 16 samples */
    thresh_accum_cnt = 16;
    scale_factor = 5;
    max_index = 0;
    memset(theta, 0, sizeof(theta));
    memset(x_est, 0, sizeof(x_est));
    memset(Y, 0, sizeof(Y));
    memset(y_est, 0, sizeof(y_est));
    memset(x_tilde, 0, sizeof(x_tilde));

    for (i = 0; i < NUM_BIN; i++) {
        s32 accum_cnt, accum_tx, accum_rx, accum_ang;

        /* number of samples */
        accum_cnt = data_L[i] & 0xffff;

        if (accum_cnt <= thresh_accum_cnt)
            continue;

        /* sum(tx amplitude) */
        accum_tx = ((data_L[i] >> 16) & 0xffff) |
            ((data_U[i] & 0x7ff) << 16);

        /* sum(rx amplitude distance to lower bin edge) */
        accum_rx = ((data_U[i] >> 11) & 0x1f) |
            ((data_L[i + 23] & 0xffff) << 5);

        /* sum(angles) */
        accum_ang = ((data_L[i + 23] >> 16) & 0xffff) |
            ((data_U[i + 23] & 0x7ff) << 16);

        accum_tx <<= scale_factor;
        accum_rx <<= scale_factor;
        x_est[i + 1] = (((accum_tx + accum_cnt) / accum_cnt) + 32) >>
            scale_factor;

        Y[i + 1] = ((((accum_rx + accum_cnt) / accum_cnt) + 32) >>
                scale_factor) +
                (1 << scale_factor) * max_index + 16;

        if (accum_ang >= (1 << 26))
            accum_ang -= 1 << 27;

        theta[i + 1] = ((accum_ang * (1 << scale_factor)) + accum_cnt) /
            accum_cnt;

        max_index++;
    }

    /*
     * Find average theta of first 5 bin and all of those to same value.
     * Curve is linear at that range.
     */
    for (i = 1; i < 6; i++)
        theta_low_bin += theta[i];

    theta_low_bin = theta_low_bin / 5;
    for (i = 1; i < 6; i++)
        theta[i] = theta_low_bin;

    /* Set values at origin */
    theta[0] = theta_low_bin;
    for (i = 0; i <= max_index; i++)
        theta[i] -= theta_low_bin;

    x_est[0] = 0;
    Y[0] = 0;
    scale_factor = 8;

    /* low signal gain */
    if (x_est[6] == x_est[3])
        return false;

    G_fxp =
        (((Y[6] - Y[3]) * 1 << scale_factor) +
         (x_est[6] - x_est[3])) / (x_est[6] - x_est[3]);

    /* prevent division by zero */
    if (G_fxp == 0)
        return false;

    Y_intercept =
        (G_fxp * (x_est[0] - x_est[3]) +
         (1 << scale_factor)) / (1 << scale_factor) + Y[3];

    for (i = 0; i <= max_index; i++)
        y_est[i] = Y[i] - Y_intercept;

    for (i = 0; i <= 3; i++) {
        y_est[i] = i * 32;
        x_est[i] = ((y_est[i] * 1 << scale_factor) + G_fxp) / G_fxp;
    }

    if (y_est[max_index] == 0)
        return false;

    x_est_fxp1_nonlin =
        x_est[max_index] - ((1 << scale_factor) * y_est[max_index] +
                G_fxp) / G_fxp;

    order_x_by_y =
        (x_est_fxp1_nonlin + y_est[max_index]) / y_est[max_index];

    if (order_x_by_y == 0)
        M = 10;
    else if (order_x_by_y == 1)
        M = 9;
    else
        M = 8;

    I = (max_index > 15) ? 7 : max_index >> 1;
    L = max_index - I;
    scale_factor = 8;
    sum_y_sqr = 0;
    sum_y_quad = 0;
    x_tilde_abs = 0;

    for (i = 0; i <= L; i++) {
        unsigned int y_sqr;
        unsigned int y_quad;
        unsigned int tmp_abs;

        /* prevent division by zero */
        if (y_est[i + I] == 0)
            return false;

        x_est_fxp1_nonlin =
            x_est[i + I] - ((1 << scale_factor) * y_est[i + I] +
                    G_fxp) / G_fxp;

        x_tilde[i] =
            (x_est_fxp1_nonlin * (1 << M) + y_est[i + I]) / y_est[i +
                                      I];
        x_tilde[i] =
            (x_tilde[i] * (1 << M) + y_est[i + I]) / y_est[i + I];
        x_tilde[i] =
            (x_tilde[i] * (1 << M) + y_est[i + I]) / y_est[i + I];
        y_sqr =
            (y_est[i + I] * y_est[i + I] +
             (scale_factor * scale_factor)) / (scale_factor *
                               scale_factor);
        tmp_abs = abs(x_tilde[i]);
        if (tmp_abs > x_tilde_abs)
            x_tilde_abs = tmp_abs;

        y_quad = y_sqr * y_sqr;
        sum_y_sqr = sum_y_sqr + y_sqr;
        sum_y_quad = sum_y_quad + y_quad;
        B1_tmp[i] = y_sqr * (L + 1);
        B2_tmp[i] = y_sqr;
    }

    B1_abs_max = 0;
    B2_abs_max = 0;
    for (i = 0; i <= L; i++) {
        int abs_val;

        B1_tmp[i] -= sum_y_sqr;
        B2_tmp[i] = sum_y_quad - sum_y_sqr * B2_tmp[i];

        abs_val = abs(B1_tmp[i]);
        if (abs_val > B1_abs_max)
            B1_abs_max = abs_val;

        abs_val = abs(B2_tmp[i]);
        if (abs_val > B2_abs_max)
            B2_abs_max = abs_val;
    }

    Q_x = find_proper_scale(find_expn(x_tilde_abs), 10);
    Q_B1 = find_proper_scale(find_expn(B1_abs_max), 10);
    Q_B2 = find_proper_scale(find_expn(B2_abs_max), 10);

    beta_raw = 0;
    alpha_raw = 0;
    for (i = 0; i <= L; i++) {
        x_tilde[i] = x_tilde[i] / (1 << Q_x);
        B1_tmp[i] = B1_tmp[i] / (1 << Q_B1);
        B2_tmp[i] = B2_tmp[i] / (1 << Q_B2);
        beta_raw = beta_raw + B1_tmp[i] * x_tilde[i];
        alpha_raw = alpha_raw + B2_tmp[i] * x_tilde[i];
    }

    scale_B =
        ((sum_y_quad / scale_factor) * (L + 1) -
         (sum_y_sqr / scale_factor) * sum_y_sqr) * scale_factor;

    Q_scale_B = find_proper_scale(find_expn(abs(scale_B)), 10);
    scale_B = scale_B / (1 << Q_scale_B);
    if (scale_B == 0)
        return false;
    Q_beta = find_proper_scale(find_expn(abs(beta_raw)), 10);
    Q_alpha = find_proper_scale(find_expn(abs(alpha_raw)), 10);
    beta_raw = beta_raw / (1 << Q_beta);
    alpha_raw = alpha_raw / (1 << Q_alpha);
    alpha = (alpha_raw << 10) / scale_B;
    beta = (beta_raw << 10) / scale_B;
    order_1 = 3 * M - Q_x - Q_B1 - Q_beta + 10 + Q_scale_B;
    order_2 = 3 * M - Q_x - Q_B2 - Q_alpha + 10 + Q_scale_B;
    order1_5x = order_1 / 5;
    order2_3x = order_2 / 3;
    order1_5x_rem = order_1 - 5 * order1_5x;
    order2_3x_rem = order_2 - 3 * order2_3x;

    for (i = 0; i < PAPRD_TABLE_SZ; i++) {
        tmp = i * 32;
        y5 = ((beta * tmp) >> 6) >> order1_5x;
        y5 = (y5 * tmp) >> order1_5x;
        y5 = (y5 * tmp) >> order1_5x;
        y5 = (y5 * tmp) >> order1_5x;
        y5 = (y5 * tmp) >> order1_5x;
        y5 = y5 >> order1_5x_rem;
        y3 = (alpha * tmp) >> order2_3x;
        y3 = (y3 * tmp) >> order2_3x;
        y3 = (y3 * tmp) >> order2_3x;
        y3 = y3 >> order2_3x_rem;
        PA_in[i] = y5 + y3 + (256 * tmp) / G_fxp;

        if (i >= 2) {
            tmp = PA_in[i] - PA_in[i - 1];
            if (tmp < 0)
                PA_in[i] =
                    PA_in[i - 1] + (PA_in[i - 1] -
                            PA_in[i - 2]);
        }

        PA_in[i] = (PA_in[i] < 1400) ? PA_in[i] : 1400;
    }

    beta_raw = 0;
    alpha_raw = 0;

    for (i = 0; i <= L; i++) {
        int theta_tilde =
            ((theta[i + I] << M) + y_est[i + I]) / y_est[i + I];
        theta_tilde =
            ((theta_tilde << M) + y_est[i + I]) / y_est[i + I];
        theta_tilde =
            ((theta_tilde << M) + y_est[i + I]) / y_est[i + I];
        beta_raw = beta_raw + B1_tmp[i] * theta_tilde;
        alpha_raw = alpha_raw + B2_tmp[i] * theta_tilde;
    }

    Q_beta = find_proper_scale(find_expn(abs(beta_raw)), 10);
    Q_alpha = find_proper_scale(find_expn(abs(alpha_raw)), 10);
    beta_raw = beta_raw / (1 << Q_beta);
    alpha_raw = alpha_raw / (1 << Q_alpha);

    alpha = (alpha_raw << 10) / scale_B;
    beta = (beta_raw << 10) / scale_B;
    order_1 = 3 * M - Q_x - Q_B1 - Q_beta + 10 + Q_scale_B + 5;
    order_2 = 3 * M - Q_x - Q_B2 - Q_alpha + 10 + Q_scale_B + 5;
    order1_5x = order_1 / 5;
    order2_3x = order_2 / 3;
    order1_5x_rem = order_1 - 5 * order1_5x;
    order2_3x_rem = order_2 - 3 * order2_3x;

    for (i = 0; i < PAPRD_TABLE_SZ; i++) {
        int PA_angle;

        /* pa_table[4] is calculated from PA_angle for i=5 */
        if (i == 4)
            continue;

        tmp = i * 32;
        if (beta > 0)
            y5 = (((beta * tmp - 64) >> 6) -
                  (1 << order1_5x)) / (1 << order1_5x);
        else
            y5 = ((((beta * tmp - 64) >> 6) +
                   (1 << order1_5x)) / (1 << order1_5x));

        y5 = (y5 * tmp) / (1 << order1_5x);
        y5 = (y5 * tmp) / (1 << order1_5x);
        y5 = (y5 * tmp) / (1 << order1_5x);
        y5 = (y5 * tmp) / (1 << order1_5x);
        y5 = y5 / (1 << order1_5x_rem);

        if (beta > 0)
            y3 = (alpha * tmp -
                  (1 << order2_3x)) / (1 << order2_3x);
        else
            y3 = (alpha * tmp +
                  (1 << order2_3x)) / (1 << order2_3x);
        y3 = (y3 * tmp) / (1 << order2_3x);
        y3 = (y3 * tmp) / (1 << order2_3x);
        y3 = y3 / (1 << order2_3x_rem);

        if (i < 4) {
            PA_angle = 0;
        } else {
            PA_angle = y5 + y3;
            if (PA_angle < -150)
                PA_angle = -150;
            else if (PA_angle > 150)
                PA_angle = 150;
        }

        pa_table[i] = ((PA_in[i] & 0x7ff) << 11) + (PA_angle & 0x7ff);
        if (i == 5) {
            PA_angle = (PA_angle + 2) >> 1;
            pa_table[i - 1] = ((PA_in[i - 1] & 0x7ff) << 11) +
                (PA_angle & 0x7ff);
        }
    }

    *gain = G_fxp;
    return true;
}

void ar9003_paprd_populate_single_table(struct ath_hw *ah,
                    struct ath9k_hw_cal_data *caldata,
                    int chain)
{
    u32 *paprd_table_val = caldata->pa_table[chain];
    u32 small_signal_gain = caldata->small_signal_gain[chain];
    u32 training_power = ah->paprd_training_power;
    u32 reg = 0;
    int i;

    if (chain == 0)
        reg = AR_PHY_PAPRD_MEM_TAB_B0;
    else if (chain == 1)
        reg = AR_PHY_PAPRD_MEM_TAB_B1;
    else if (chain == 2)
        reg = AR_PHY_PAPRD_MEM_TAB_B2;

    for (i = 0; i < PAPRD_TABLE_SZ; i++) {
        REG_WRITE(ah, reg, paprd_table_val[i]);
        reg = reg + 4;
    }

    if (chain == 0)
        reg = AR_PHY_PA_GAIN123_B0;
    else if (chain == 1)
        reg = AR_PHY_PA_GAIN123_B1;
    else
        reg = AR_PHY_PA_GAIN123_B2;

    REG_RMW_FIELD(ah, reg, AR_PHY_PA_GAIN123_PA_GAIN1, small_signal_gain);

    REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B0,
              AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
              training_power);

    if (ah->caps.tx_chainmask & BIT(1))
        REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B1,
                  AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
                  training_power);

    if (ah->caps.tx_chainmask & BIT(2))
        /* val AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL correct? */
        REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B2,
                  AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
                  training_power);
}
EXPORT_SYMBOL(ar9003_paprd_populate_single_table);

int ar9003_paprd_setup_gain_table(struct ath_hw *ah, int chain)
{
    unsigned int i, desired_gain, gain_index;
    unsigned int train_power = ah->paprd_training_power;

    desired_gain = ar9003_get_desired_gain(ah, chain, train_power);

    gain_index = 0;
    for (i = 0; i < PAPRD_GAIN_TABLE_ENTRIES; i++) {
        if (ah->paprd_gain_table_index[i] >= desired_gain)
            break;
        gain_index++;
    }

    ar9003_tx_force_gain(ah, gain_index);

    REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
            AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);

    return 0;
}
EXPORT_SYMBOL(ar9003_paprd_setup_gain_table);

static bool ar9003_paprd_retrain_pa_in(struct ath_hw *ah,
                       struct ath9k_hw_cal_data *caldata,
                       int chain)
{
    u32 *pa_in = caldata->pa_table[chain];
    int capdiv_offset, quick_drop_offset;
    int capdiv2g, quick_drop;
    int count = 0;
    int i;

    if (!AR_SREV_9485(ah) && !AR_SREV_9330(ah))
        return false;

    capdiv2g = REG_READ_FIELD(ah, AR_PHY_65NM_CH0_TXRF3,
                  AR_PHY_65NM_CH0_TXRF3_CAPDIV2G);

    quick_drop = REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
                    AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP);

    if (quick_drop)
        quick_drop -= 0x40;

    for (i = 0; i < NUM_BIN + 1; i++) {
        if (pa_in[i] == 1400)
            count++;
    }

    if (AR_SREV_9485(ah)) {
        if (pa_in[23] < 800) {
            capdiv_offset = (int)((1000 - pa_in[23] + 75) / 150);
            capdiv2g += capdiv_offset;
            if (capdiv2g > 7) {
                capdiv2g = 7;
                if (pa_in[23] < 600) {
                    quick_drop++;
                    if (quick_drop > 0)
                        quick_drop = 0;
                }
            }
        } else if (pa_in[23] == 1400) {
            quick_drop_offset = min_t(int, count / 3, 2);
            quick_drop += quick_drop_offset;
            capdiv2g += quick_drop_offset / 2;

            if (capdiv2g > 7)
                capdiv2g = 7;

            if (quick_drop > 0) {
                quick_drop = 0;
                capdiv2g -= quick_drop_offset;
                if (capdiv2g < 0)
                    capdiv2g = 0;
            }
        } else {
            return false;
        }
    } else if (AR_SREV_9330(ah)) {
        if (pa_in[23] < 1000) {
            capdiv_offset = (1000 - pa_in[23]) / 100;
            capdiv2g += capdiv_offset;
            if (capdiv_offset > 3) {
                capdiv_offset = 1;
                quick_drop--;
            }

            capdiv2g += capdiv_offset;
            if (capdiv2g > 6)
                capdiv2g = 6;
            if (quick_drop < -4)
                quick_drop = -4;
        } else if (pa_in[23] == 1400) {
            if (count > 3) {
                quick_drop++;
                capdiv2g -= count / 4;
                if (quick_drop > -2)
                    quick_drop = -2;
            } else {
                capdiv2g--;
            }

            if (capdiv2g < 0)
                capdiv2g = 0;
        } else {
            return false;
        }
    }

    REG_RMW_FIELD(ah, AR_PHY_65NM_CH0_TXRF3,
              AR_PHY_65NM_CH0_TXRF3_CAPDIV2G, capdiv2g);
    REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
              AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
              quick_drop);

    return true;
}

int ar9003_paprd_create_curve(struct ath_hw *ah,
                  struct ath9k_hw_cal_data *caldata, int chain)
{
    u16 *small_signal_gain = &caldata->small_signal_gain[chain];
    u32 *pa_table = caldata->pa_table[chain];
    u32 *data_L, *data_U;
    int i, status = 0;
    u32 *buf;
    u32 reg;

    memset(caldata->pa_table[chain], 0, sizeof(caldata->pa_table[chain]));

    buf = kmalloc(2 * 48 * sizeof(u32), GFP_ATOMIC);
    if (!buf)
        return -ENOMEM;

    data_L = &buf[0];
    data_U = &buf[48];

    REG_CLR_BIT(ah, AR_PHY_CHAN_INFO_MEMORY,
            AR_PHY_CHAN_INFO_MEMORY_CHANINFOMEM_S2_READ);

    reg = AR_PHY_CHAN_INFO_TAB_0;
    for (i = 0; i < 48; i++)
        data_L[i] = REG_READ(ah, reg + (i << 2));

    REG_SET_BIT(ah, AR_PHY_CHAN_INFO_MEMORY,
            AR_PHY_CHAN_INFO_MEMORY_CHANINFOMEM_S2_READ);

    for (i = 0; i < 48; i++)
        data_U[i] = REG_READ(ah, reg + (i << 2));

    if (!create_pa_curve(data_L, data_U, pa_table, small_signal_gain))
        status = -2;

    if (ar9003_paprd_retrain_pa_in(ah, caldata, chain))
        status = -EINPROGRESS;

    REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
            AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);

    kfree(buf);

    return status;
}
EXPORT_SYMBOL(ar9003_paprd_create_curve);

int ar9003_paprd_init_table(struct ath_hw *ah)
{
    int ret;

    ret = ar9003_paprd_setup_single_table(ah);
    if (ret < 0)
        return ret;

    ar9003_paprd_get_gain_table(ah);
    return 0;
}
EXPORT_SYMBOL(ar9003_paprd_init_table);

bool ar9003_paprd_is_done(struct ath_hw *ah)
{
    int paprd_done, agc2_pwr;
    paprd_done = REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_STAT1,
                AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);

    if (paprd_done == 0x1) {
        agc2_pwr = REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_STAT1,
                AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_AGC2_PWR);

        ath_dbg(ath9k_hw_common(ah), CALIBRATE,
            "AGC2_PWR = 0x%x training done = 0x%x\n",
            agc2_pwr, paprd_done);
    /*
     * agc2_pwr range should not be less than 'IDEAL_AGC2_PWR_CHANGE'
     * when the training is completely done, otherwise retraining is
     * done to make sure the value is in ideal range
     */
        if (agc2_pwr <= PAPRD_IDEAL_AGC2_PWR_RANGE)
            paprd_done = 0;
    }

    return !!paprd_done;
}
EXPORT_SYMBOL(ar9003_paprd_is_done);