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lo.c

/*

  Broadcom B43 wireless driver

  G PHY LO (LocalOscillator) Measuring and Control routines

  Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
  Copyright (c) 2005, 2006 Stefano Brivio <st3@riseup.net>
  Copyright (c) 2005-2007 Michael Buesch <mb@bu3sch.de>
  Copyright (c) 2005, 2006 Danny van Dyk <kugelfang@gentoo.org>
  Copyright (c) 2005, 2006 Andreas Jaggi <andreas.jaggi@waterwave.ch>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  Boston, MA 02110-1301, USA.

*/

#include "b43.h"
#include "lo.h"
#include "phy.h"
#include "main.h"

#include <linux/delay.h>
#include <linux/sched.h>


/* Define to 1 to always calibrate all possible LO control pairs.
 * This is a workaround until we fix the partial LO calibration optimization. */
#define B43_CALIB_ALL_LOCTLS  1


/* Write the LocalOscillator Control (adjust) value-pair. */
static void b43_lo_write(struct b43_wldev *dev, struct b43_loctl *control)
{
      struct b43_phy *phy = &dev->phy;
      u16 value;
      u16 reg;

      if (B43_DEBUG) {
            if (unlikely(abs(control->i) > 16 || abs(control->q) > 16)) {
                  b43dbg(dev->wl, "Invalid LO control pair "
                         "(I: %d, Q: %d)\n", control->i, control->q);
                  dump_stack();
                  return;
            }
      }

      value = (u8) (control->q);
      value |= ((u8) (control->i)) << 8;

      reg = (phy->type == B43_PHYTYPE_B) ? 0x002F : B43_PHY_LO_CTL;
      b43_phy_write(dev, reg, value);
}

static int assert_rfatt_and_bbatt(const struct b43_rfatt *rfatt,
                          const struct b43_bbatt *bbatt,
                          struct b43_wldev *dev)
{
      int err = 0;

      /* Check the attenuation values against the LO control array sizes. */
      if (unlikely(rfatt->att >= B43_NR_RF)) {
            b43err(dev->wl, "rfatt(%u) >= size of LO array\n", rfatt->att);
            err = -EINVAL;
      }
      if (unlikely(bbatt->att >= B43_NR_BB)) {
            b43err(dev->wl, "bbatt(%u) >= size of LO array\n", bbatt->att);
            err = -EINVAL;
      }

      return err;
}

#if !B43_CALIB_ALL_LOCTLS
static
struct b43_loctl *b43_get_lo_g_ctl_nopadmix(struct b43_wldev *dev,
                                  const struct b43_rfatt *rfatt,
                                  const struct b43_bbatt *bbatt)
{
      struct b43_phy *phy = &dev->phy;
      struct b43_txpower_lo_control *lo = phy->lo_control;

      if (assert_rfatt_and_bbatt(rfatt, bbatt, dev))
            return &(lo->no_padmix[0][0]);      /* Just prevent a crash */
      return &(lo->no_padmix[bbatt->att][rfatt->att]);
}
#endif /* !B43_CALIB_ALL_LOCTLS */

struct b43_loctl *b43_get_lo_g_ctl(struct b43_wldev *dev,
                           const struct b43_rfatt *rfatt,
                           const struct b43_bbatt *bbatt)
{
      struct b43_phy *phy = &dev->phy;
      struct b43_txpower_lo_control *lo = phy->lo_control;

      if (assert_rfatt_and_bbatt(rfatt, bbatt, dev))
            return &(lo->no_padmix[0][0]);      /* Just prevent a crash */
      if (rfatt->with_padmix)
            return &(lo->with_padmix[bbatt->att][rfatt->att]);
      return &(lo->no_padmix[bbatt->att][rfatt->att]);
}

/* Call a function for every possible LO control value-pair. */
static void b43_call_for_each_loctl(struct b43_wldev *dev,
                            void (*func) (struct b43_wldev *,
                                      struct b43_loctl *))
{
      struct b43_phy *phy = &dev->phy;
      struct b43_txpower_lo_control *ctl = phy->lo_control;
      int i, j;

      for (i = 0; i < B43_NR_BB; i++) {
            for (j = 0; j < B43_NR_RF; j++)
                  func(dev, &(ctl->with_padmix[i][j]));
      }
      for (i = 0; i < B43_NR_BB; i++) {
            for (j = 0; j < B43_NR_RF; j++)
                  func(dev, &(ctl->no_padmix[i][j]));
      }
}

static u16 lo_b_r15_loop(struct b43_wldev *dev)
{
      int i;
      u16 ret = 0;

      for (i = 0; i < 10; i++) {
            b43_phy_write(dev, 0x0015, 0xAFA0);
            udelay(1);
            b43_phy_write(dev, 0x0015, 0xEFA0);
            udelay(10);
            b43_phy_write(dev, 0x0015, 0xFFA0);
            udelay(40);
            ret += b43_phy_read(dev, 0x002C);
      }

      return ret;
}

void b43_lo_b_measure(struct b43_wldev *dev)
{
      struct b43_phy *phy = &dev->phy;
      u16 regstack[12] = { 0 };
      u16 mls;
      u16 fval;
      int i, j;

      regstack[0] = b43_phy_read(dev, 0x0015);
      regstack[1] = b43_radio_read16(dev, 0x0052) & 0xFFF0;

      if (phy->radio_ver == 0x2053) {
            regstack[2] = b43_phy_read(dev, 0x000A);
            regstack[3] = b43_phy_read(dev, 0x002A);
            regstack[4] = b43_phy_read(dev, 0x0035);
            regstack[5] = b43_phy_read(dev, 0x0003);
            regstack[6] = b43_phy_read(dev, 0x0001);
            regstack[7] = b43_phy_read(dev, 0x0030);

            regstack[8] = b43_radio_read16(dev, 0x0043);
            regstack[9] = b43_radio_read16(dev, 0x007A);
            regstack[10] = b43_read16(dev, 0x03EC);
            regstack[11] = b43_radio_read16(dev, 0x0052) & 0x00F0;

            b43_phy_write(dev, 0x0030, 0x00FF);
            b43_write16(dev, 0x03EC, 0x3F3F);
            b43_phy_write(dev, 0x0035, regstack[4] & 0xFF7F);
            b43_radio_write16(dev, 0x007A, regstack[9] & 0xFFF0);
      }
      b43_phy_write(dev, 0x0015, 0xB000);
      b43_phy_write(dev, 0x002B, 0x0004);

      if (phy->radio_ver == 0x2053) {
            b43_phy_write(dev, 0x002B, 0x0203);
            b43_phy_write(dev, 0x002A, 0x08A3);
      }

      phy->minlowsig[0] = 0xFFFF;

      for (i = 0; i < 4; i++) {
            b43_radio_write16(dev, 0x0052, regstack[1] | i);
            lo_b_r15_loop(dev);
      }
      for (i = 0; i < 10; i++) {
            b43_radio_write16(dev, 0x0052, regstack[1] | i);
            mls = lo_b_r15_loop(dev) / 10;
            if (mls < phy->minlowsig[0]) {
                  phy->minlowsig[0] = mls;
                  phy->minlowsigpos[0] = i;
            }
      }
      b43_radio_write16(dev, 0x0052, regstack[1] | phy->minlowsigpos[0]);

      phy->minlowsig[1] = 0xFFFF;

      for (i = -4; i < 5; i += 2) {
            for (j = -4; j < 5; j += 2) {
                  if (j < 0)
                        fval = (0x0100 * i) + j + 0x0100;
                  else
                        fval = (0x0100 * i) + j;
                  b43_phy_write(dev, 0x002F, fval);
                  mls = lo_b_r15_loop(dev) / 10;
                  if (mls < phy->minlowsig[1]) {
                        phy->minlowsig[1] = mls;
                        phy->minlowsigpos[1] = fval;
                  }
            }
      }
      phy->minlowsigpos[1] += 0x0101;

      b43_phy_write(dev, 0x002F, phy->minlowsigpos[1]);
      if (phy->radio_ver == 0x2053) {
            b43_phy_write(dev, 0x000A, regstack[2]);
            b43_phy_write(dev, 0x002A, regstack[3]);
            b43_phy_write(dev, 0x0035, regstack[4]);
            b43_phy_write(dev, 0x0003, regstack[5]);
            b43_phy_write(dev, 0x0001, regstack[6]);
            b43_phy_write(dev, 0x0030, regstack[7]);

            b43_radio_write16(dev, 0x0043, regstack[8]);
            b43_radio_write16(dev, 0x007A, regstack[9]);

            b43_radio_write16(dev, 0x0052,
                          (b43_radio_read16(dev, 0x0052) & 0x000F)
                          | regstack[11]);

            b43_write16(dev, 0x03EC, regstack[10]);
      }
      b43_phy_write(dev, 0x0015, regstack[0]);
}

static u16 lo_measure_feedthrough(struct b43_wldev *dev,
                          u16 lna, u16 pga, u16 trsw_rx)
{
      struct b43_phy *phy = &dev->phy;
      u16 rfover;
      u16 feedthrough;

      if (phy->gmode) {
            lna <<= B43_PHY_RFOVERVAL_LNA_SHIFT;
            pga <<= B43_PHY_RFOVERVAL_PGA_SHIFT;

            B43_WARN_ON(lna & ~B43_PHY_RFOVERVAL_LNA);
            B43_WARN_ON(pga & ~B43_PHY_RFOVERVAL_PGA);
/*FIXME This assertion fails        B43_WARN_ON(trsw_rx & ~(B43_PHY_RFOVERVAL_TRSWRX |
                            B43_PHY_RFOVERVAL_BW));
*/
            trsw_rx &= (B43_PHY_RFOVERVAL_TRSWRX | B43_PHY_RFOVERVAL_BW);

            /* Construct the RF Override Value */
            rfover = B43_PHY_RFOVERVAL_UNK;
            rfover |= pga;
            rfover |= lna;
            rfover |= trsw_rx;
            if ((dev->dev->bus->sprom.r1.boardflags_lo & B43_BFL_EXTLNA) &&
                phy->rev > 6)
                  rfover |= B43_PHY_RFOVERVAL_EXTLNA;

            b43_phy_write(dev, B43_PHY_PGACTL, 0xE300);
            b43_phy_write(dev, B43_PHY_RFOVERVAL, rfover);
            udelay(10);
            rfover |= B43_PHY_RFOVERVAL_BW_LBW;
            b43_phy_write(dev, B43_PHY_RFOVERVAL, rfover);
            udelay(10);
            rfover |= B43_PHY_RFOVERVAL_BW_LPF;
            b43_phy_write(dev, B43_PHY_RFOVERVAL, rfover);
            udelay(10);
            b43_phy_write(dev, B43_PHY_PGACTL, 0xF300);
      } else {
            pga |= B43_PHY_PGACTL_UNKNOWN;
            b43_phy_write(dev, B43_PHY_PGACTL, pga);
            udelay(10);
            pga |= B43_PHY_PGACTL_LOWBANDW;
            b43_phy_write(dev, B43_PHY_PGACTL, pga);
            udelay(10);
            pga |= B43_PHY_PGACTL_LPF;
            b43_phy_write(dev, B43_PHY_PGACTL, pga);
      }
      udelay(21);
      feedthrough = b43_phy_read(dev, B43_PHY_LO_LEAKAGE);

      /* This is a good place to check if we need to relax a bit,
       * as this is the main function called regularly
       * in the LO calibration. */
      cond_resched();

      return feedthrough;
}

/* TXCTL Register and Value Table.
 * Returns the "TXCTL Register".
 * "value" is the "TXCTL Value".
 * "pad_mix_gain" is the PAD Mixer Gain.
 */
static u16 lo_txctl_register_table(struct b43_wldev *dev,
                           u16 * value, u16 * pad_mix_gain)
{
      struct b43_phy *phy = &dev->phy;
      u16 reg, v, padmix;

      if (phy->type == B43_PHYTYPE_B) {
            v = 0x30;
            if (phy->radio_rev <= 5) {
                  reg = 0x43;
                  padmix = 0;
            } else {
                  reg = 0x52;
                  padmix = 5;
            }
      } else {
            if (phy->rev >= 2 && phy->radio_rev == 8) {
                  reg = 0x43;
                  v = 0x10;
                  padmix = 2;
            } else {
                  reg = 0x52;
                  v = 0x30;
                  padmix = 5;
            }
      }
      if (value)
            *value = v;
      if (pad_mix_gain)
            *pad_mix_gain = padmix;

      return reg;
}

static void lo_measure_txctl_values(struct b43_wldev *dev)
{
      struct b43_phy *phy = &dev->phy;
      struct b43_txpower_lo_control *lo = phy->lo_control;
      u16 reg, mask;
      u16 trsw_rx, pga;
      u16 radio_pctl_reg;

      static const u8 tx_bias_values[] = {
            0x09, 0x08, 0x0A, 0x01, 0x00,
            0x02, 0x05, 0x04, 0x06,
      };
      static const u8 tx_magn_values[] = {
            0x70, 0x40,
      };

      if (!has_loopback_gain(phy)) {
            radio_pctl_reg = 6;
            trsw_rx = 2;
            pga = 0;
      } else {
            int lb_gain;      /* Loopback gain (in dB) */

            trsw_rx = 0;
            lb_gain = phy->max_lb_gain / 2;
            if (lb_gain > 10) {
                  radio_pctl_reg = 0;
                  pga = abs(10 - lb_gain) / 6;
                  pga = limit_value(pga, 0, 15);
            } else {
                  int cmp_val;
                  int tmp;

                  pga = 0;
                  cmp_val = 0x24;
                  if ((phy->rev >= 2) &&
                      (phy->radio_ver == 0x2050) && (phy->radio_rev == 8))
                        cmp_val = 0x3C;
                  tmp = lb_gain;
                  if ((10 - lb_gain) < cmp_val)
                        tmp = (10 - lb_gain);
                  if (tmp < 0)
                        tmp += 6;
                  else
                        tmp += 3;
                  cmp_val /= 4;
                  tmp /= 4;
                  if (tmp >= cmp_val)
                        radio_pctl_reg = cmp_val;
                  else
                        radio_pctl_reg = tmp;
            }
      }
      b43_radio_write16(dev, 0x43, (b43_radio_read16(dev, 0x43)
                              & 0xFFF0) | radio_pctl_reg);
      b43_phy_set_baseband_attenuation(dev, 2);

      reg = lo_txctl_register_table(dev, &mask, NULL);
      mask = ~mask;
      b43_radio_write16(dev, reg, b43_radio_read16(dev, reg)
                    & mask);

      if (has_tx_magnification(phy)) {
            int i, j;
            int feedthrough;
            int min_feedth = 0xFFFF;
            u8 tx_magn, tx_bias;

            for (i = 0; i < ARRAY_SIZE(tx_magn_values); i++) {
                  tx_magn = tx_magn_values[i];
                  b43_radio_write16(dev, 0x52,
                                (b43_radio_read16(dev, 0x52)
                                 & 0xFF0F) | tx_magn);
                  for (j = 0; j < ARRAY_SIZE(tx_bias_values); j++) {
                        tx_bias = tx_bias_values[j];
                        b43_radio_write16(dev, 0x52,
                                      (b43_radio_read16(dev, 0x52)
                                       & 0xFFF0) | tx_bias);
                        feedthrough =
                            lo_measure_feedthrough(dev, 0, pga,
                                             trsw_rx);
                        if (feedthrough < min_feedth) {
                              lo->tx_bias = tx_bias;
                              lo->tx_magn = tx_magn;
                              min_feedth = feedthrough;
                        }
                        if (lo->tx_bias == 0)
                              break;
                  }
                  b43_radio_write16(dev, 0x52,
                                (b43_radio_read16(dev, 0x52)
                                 & 0xFF00) | lo->tx_bias | lo->
                                tx_magn);
            }
      } else {
            lo->tx_magn = 0;
            lo->tx_bias = 0;
            b43_radio_write16(dev, 0x52, b43_radio_read16(dev, 0x52)
                          & 0xFFF0);      /* TX bias == 0 */
      }
}

static void lo_read_power_vector(struct b43_wldev *dev)
{
      struct b43_phy *phy = &dev->phy;
      struct b43_txpower_lo_control *lo = phy->lo_control;
      u16 i;
      u64 tmp;
      u64 power_vector = 0;
      int rf_offset, bb_offset;
      struct b43_loctl *loctl;

      for (i = 0; i < 8; i += 2) {
            tmp = b43_shm_read16(dev, B43_SHM_SHARED, 0x310 + i);
            /* Clear the top byte. We get holes in the bitmap... */
            tmp &= 0xFF;
            power_vector |= (tmp << (i * 8));
            /* Clear the vector on the device. */
            b43_shm_write16(dev, B43_SHM_SHARED, 0x310 + i, 0);
      }

      if (power_vector)
            lo->power_vector = power_vector;
      power_vector = lo->power_vector;

      for (i = 0; i < 64; i++) {
            if (power_vector & ((u64) 1ULL << i)) {
                  /* Now figure out which b43_loctl corresponds
                   * to this bit.
                   */
                  rf_offset = i / lo->rfatt_list.len;
                  bb_offset = i % lo->rfatt_list.len; //FIXME?
                  loctl =
                      b43_get_lo_g_ctl(dev,
                                   &lo->rfatt_list.list[rf_offset],
                                   &lo->bbatt_list.list[bb_offset]);
                  /* And mark it as "used", as the device told us
                   * through the bitmap it is using it.
                   */
                  loctl->used = 1;
            }
      }
}

/* 802.11/LO/GPHY/MeasuringGains */
static void lo_measure_gain_values(struct b43_wldev *dev,
                           s16 max_rx_gain, int use_trsw_rx)
{
      struct b43_phy *phy = &dev->phy;
      u16 tmp;

      if (max_rx_gain < 0)
            max_rx_gain = 0;

      if (has_loopback_gain(phy)) {
            int trsw_rx = 0;
            int trsw_rx_gain;

            if (use_trsw_rx) {
                  trsw_rx_gain = phy->trsw_rx_gain / 2;
                  if (max_rx_gain >= trsw_rx_gain) {
                        trsw_rx_gain = max_rx_gain - trsw_rx_gain;
                        trsw_rx = 0x20;
                  }
            } else
                  trsw_rx_gain = max_rx_gain;
            if (trsw_rx_gain < 9) {
                  phy->lna_lod_gain = 0;
            } else {
                  phy->lna_lod_gain = 1;
                  trsw_rx_gain -= 8;
            }
            trsw_rx_gain = limit_value(trsw_rx_gain, 0, 0x2D);
            phy->pga_gain = trsw_rx_gain / 3;
            if (phy->pga_gain >= 5) {
                  phy->pga_gain -= 5;
                  phy->lna_gain = 2;
            } else
                  phy->lna_gain = 0;
      } else {
            phy->lna_gain = 0;
            phy->trsw_rx_gain = 0x20;
            if (max_rx_gain >= 0x14) {
                  phy->lna_lod_gain = 1;
                  phy->pga_gain = 2;
            } else if (max_rx_gain >= 0x12) {
                  phy->lna_lod_gain = 1;
                  phy->pga_gain = 1;
            } else if (max_rx_gain >= 0xF) {
                  phy->lna_lod_gain = 1;
                  phy->pga_gain = 0;
            } else {
                  phy->lna_lod_gain = 0;
                  phy->pga_gain = 0;
            }
      }

      tmp = b43_radio_read16(dev, 0x7A);
      if (phy->lna_lod_gain == 0)
            tmp &= ~0x0008;
      else
            tmp |= 0x0008;
      b43_radio_write16(dev, 0x7A, tmp);
}

struct lo_g_saved_values {
      u8 old_channel;

      /* Core registers */
      u16 reg_3F4;
      u16 reg_3E2;

      /* PHY registers */
      u16 phy_lo_mask;
      u16 phy_extg_01;
      u16 phy_dacctl_hwpctl;
      u16 phy_dacctl;
      u16 phy_base_14;
      u16 phy_hpwr_tssictl;
      u16 phy_analogover;
      u16 phy_analogoverval;
      u16 phy_rfover;
      u16 phy_rfoverval;
      u16 phy_classctl;
      u16 phy_base_3E;
      u16 phy_crs0;
      u16 phy_pgactl;
      u16 phy_base_2A;
      u16 phy_syncctl;
      u16 phy_base_30;
      u16 phy_base_06;

      /* Radio registers */
      u16 radio_43;
      u16 radio_7A;
      u16 radio_52;
};

static void lo_measure_setup(struct b43_wldev *dev,
                       struct lo_g_saved_values *sav)
{
      struct ssb_sprom *sprom = &dev->dev->bus->sprom;
      struct b43_phy *phy = &dev->phy;
      struct b43_txpower_lo_control *lo = phy->lo_control;
      u16 tmp;

      if (b43_has_hardware_pctl(phy)) {
            sav->phy_lo_mask = b43_phy_read(dev, B43_PHY_LO_MASK);
            sav->phy_extg_01 = b43_phy_read(dev, B43_PHY_EXTG(0x01));
            sav->phy_dacctl_hwpctl = b43_phy_read(dev, B43_PHY_DACCTL);
            sav->phy_base_14 = b43_phy_read(dev, B43_PHY_BASE(0x14));
            sav->phy_hpwr_tssictl = b43_phy_read(dev, B43_PHY_HPWR_TSSICTL);

            b43_phy_write(dev, B43_PHY_HPWR_TSSICTL,
                        b43_phy_read(dev, B43_PHY_HPWR_TSSICTL)
                        | 0x100);
            b43_phy_write(dev, B43_PHY_EXTG(0x01),
                        b43_phy_read(dev, B43_PHY_EXTG(0x01))
                        | 0x40);
            b43_phy_write(dev, B43_PHY_DACCTL,
                        b43_phy_read(dev, B43_PHY_DACCTL)
                        | 0x40);
            b43_phy_write(dev, B43_PHY_BASE(0x14),
                        b43_phy_read(dev, B43_PHY_BASE(0x14))
                        | 0x200);
      }
      if (phy->type == B43_PHYTYPE_B &&
          phy->radio_ver == 0x2050 && phy->radio_rev < 6) {
            b43_phy_write(dev, B43_PHY_BASE(0x16), 0x410);
            b43_phy_write(dev, B43_PHY_BASE(0x17), 0x820);
      }
      if (!lo->rebuild && b43_has_hardware_pctl(phy))
            lo_read_power_vector(dev);
      if (phy->rev >= 2) {
            sav->phy_analogover = b43_phy_read(dev, B43_PHY_ANALOGOVER);
            sav->phy_analogoverval =
                b43_phy_read(dev, B43_PHY_ANALOGOVERVAL);
            sav->phy_rfover = b43_phy_read(dev, B43_PHY_RFOVER);
            sav->phy_rfoverval = b43_phy_read(dev, B43_PHY_RFOVERVAL);
            sav->phy_classctl = b43_phy_read(dev, B43_PHY_CLASSCTL);
            sav->phy_base_3E = b43_phy_read(dev, B43_PHY_BASE(0x3E));
            sav->phy_crs0 = b43_phy_read(dev, B43_PHY_CRS0);

            b43_phy_write(dev, B43_PHY_CLASSCTL,
                        b43_phy_read(dev, B43_PHY_CLASSCTL)
                        & 0xFFFC);
            b43_phy_write(dev, B43_PHY_CRS0, b43_phy_read(dev, B43_PHY_CRS0)
                        & 0x7FFF);
            b43_phy_write(dev, B43_PHY_ANALOGOVER,
                        b43_phy_read(dev, B43_PHY_ANALOGOVER)
                        | 0x0003);
            b43_phy_write(dev, B43_PHY_ANALOGOVERVAL,
                        b43_phy_read(dev, B43_PHY_ANALOGOVERVAL)
                        & 0xFFFC);
            if (phy->type == B43_PHYTYPE_G) {
                  if ((phy->rev >= 7) &&
                      (sprom->r1.boardflags_lo & B43_BFL_EXTLNA)) {
                        b43_phy_write(dev, B43_PHY_RFOVER, 0x933);
                  } else {
                        b43_phy_write(dev, B43_PHY_RFOVER, 0x133);
                  }
            } else {
                  b43_phy_write(dev, B43_PHY_RFOVER, 0);
            }
            b43_phy_write(dev, B43_PHY_BASE(0x3E), 0);
      }
      sav->reg_3F4 = b43_read16(dev, 0x3F4);
      sav->reg_3E2 = b43_read16(dev, 0x3E2);
      sav->radio_43 = b43_radio_read16(dev, 0x43);
      sav->radio_7A = b43_radio_read16(dev, 0x7A);
      sav->phy_pgactl = b43_phy_read(dev, B43_PHY_PGACTL);
      sav->phy_base_2A = b43_phy_read(dev, B43_PHY_BASE(0x2A));
      sav->phy_syncctl = b43_phy_read(dev, B43_PHY_SYNCCTL);
      sav->phy_dacctl = b43_phy_read(dev, B43_PHY_DACCTL);

      if (!has_tx_magnification(phy)) {
            sav->radio_52 = b43_radio_read16(dev, 0x52);
            sav->radio_52 &= 0x00F0;
      }
      if (phy->type == B43_PHYTYPE_B) {
            sav->phy_base_30 = b43_phy_read(dev, B43_PHY_BASE(0x30));
            sav->phy_base_06 = b43_phy_read(dev, B43_PHY_BASE(0x06));
            b43_phy_write(dev, B43_PHY_BASE(0x30), 0x00FF);
            b43_phy_write(dev, B43_PHY_BASE(0x06), 0x3F3F);
      } else {
            b43_write16(dev, 0x3E2, b43_read16(dev, 0x3E2)
                      | 0x8000);
      }
      b43_write16(dev, 0x3F4, b43_read16(dev, 0x3F4)
                & 0xF000);

      tmp =
          (phy->type == B43_PHYTYPE_G) ? B43_PHY_LO_MASK : B43_PHY_BASE(0x2E);
      b43_phy_write(dev, tmp, 0x007F);

      tmp = sav->phy_syncctl;
      b43_phy_write(dev, B43_PHY_SYNCCTL, tmp & 0xFF7F);
      tmp = sav->radio_7A;
      b43_radio_write16(dev, 0x007A, tmp & 0xFFF0);

      b43_phy_write(dev, B43_PHY_BASE(0x2A), 0x8A3);
      if (phy->type == B43_PHYTYPE_G ||
          (phy->type == B43_PHYTYPE_B &&
           phy->radio_ver == 0x2050 && phy->radio_rev >= 6)) {
            b43_phy_write(dev, B43_PHY_BASE(0x2B), 0x1003);
      } else
            b43_phy_write(dev, B43_PHY_BASE(0x2B), 0x0802);
      if (phy->rev >= 2)
            b43_dummy_transmission(dev);
      b43_radio_selectchannel(dev, 6, 0);
      b43_radio_read16(dev, 0x51);  /* dummy read */
      if (phy->type == B43_PHYTYPE_G)
            b43_phy_write(dev, B43_PHY_BASE(0x2F), 0);
      if (lo->rebuild)
            lo_measure_txctl_values(dev);
      if (phy->type == B43_PHYTYPE_G && phy->rev >= 3) {
            b43_phy_write(dev, B43_PHY_LO_MASK, 0xC078);
      } else {
            if (phy->type == B43_PHYTYPE_B)
                  b43_phy_write(dev, B43_PHY_BASE(0x2E), 0x8078);
            else
                  b43_phy_write(dev, B43_PHY_LO_MASK, 0x8078);
      }
}

static void lo_measure_restore(struct b43_wldev *dev,
                         struct lo_g_saved_values *sav)
{
      struct b43_phy *phy = &dev->phy;
      struct b43_txpower_lo_control *lo = phy->lo_control;
      u16 tmp;

      if (phy->rev >= 2) {
            b43_phy_write(dev, B43_PHY_PGACTL, 0xE300);
            tmp = (phy->pga_gain << 8);
            b43_phy_write(dev, B43_PHY_RFOVERVAL, tmp | 0xA0);
            udelay(5);
            b43_phy_write(dev, B43_PHY_RFOVERVAL, tmp | 0xA2);
            udelay(2);
            b43_phy_write(dev, B43_PHY_RFOVERVAL, tmp | 0xA3);
      } else {
            tmp = (phy->pga_gain | 0xEFA0);
            b43_phy_write(dev, B43_PHY_PGACTL, tmp);
      }
      if (b43_has_hardware_pctl(phy)) {
            b43_gphy_dc_lt_init(dev);
      } else {
            if (lo->rebuild)
                  b43_lo_g_adjust_to(dev, 3, 2, 0);
            else
                  b43_lo_g_adjust(dev);
      }
      if (phy->type == B43_PHYTYPE_G) {
            if (phy->rev >= 3)
                  b43_phy_write(dev, B43_PHY_BASE(0x2E), 0xC078);
            else
                  b43_phy_write(dev, B43_PHY_BASE(0x2E), 0x8078);
            if (phy->rev >= 2)
                  b43_phy_write(dev, B43_PHY_BASE(0x2F), 0x0202);
            else
                  b43_phy_write(dev, B43_PHY_BASE(0x2F), 0x0101);
      }
      b43_write16(dev, 0x3F4, sav->reg_3F4);
      b43_phy_write(dev, B43_PHY_PGACTL, sav->phy_pgactl);
      b43_phy_write(dev, B43_PHY_BASE(0x2A), sav->phy_base_2A);
      b43_phy_write(dev, B43_PHY_SYNCCTL, sav->phy_syncctl);
      b43_phy_write(dev, B43_PHY_DACCTL, sav->phy_dacctl);
      b43_radio_write16(dev, 0x43, sav->radio_43);
      b43_radio_write16(dev, 0x7A, sav->radio_7A);
      if (!has_tx_magnification(phy)) {
            tmp = sav->radio_52;
            b43_radio_write16(dev, 0x52, (b43_radio_read16(dev, 0x52)
                                    & 0xFF0F) | tmp);
      }
      b43_write16(dev, 0x3E2, sav->reg_3E2);
      if (phy->type == B43_PHYTYPE_B &&
          phy->radio_ver == 0x2050 && phy->radio_rev <= 5) {
            b43_phy_write(dev, B43_PHY_BASE(0x30), sav->phy_base_30);
            b43_phy_write(dev, B43_PHY_BASE(0x06), sav->phy_base_06);
      }
      if (phy->rev >= 2) {
            b43_phy_write(dev, B43_PHY_ANALOGOVER, sav->phy_analogover);
            b43_phy_write(dev, B43_PHY_ANALOGOVERVAL,
                        sav->phy_analogoverval);
            b43_phy_write(dev, B43_PHY_CLASSCTL, sav->phy_classctl);
            b43_phy_write(dev, B43_PHY_RFOVER, sav->phy_rfover);
            b43_phy_write(dev, B43_PHY_RFOVERVAL, sav->phy_rfoverval);
            b43_phy_write(dev, B43_PHY_BASE(0x3E), sav->phy_base_3E);
            b43_phy_write(dev, B43_PHY_CRS0, sav->phy_crs0);
      }
      if (b43_has_hardware_pctl(phy)) {
            tmp = (sav->phy_lo_mask & 0xBFFF);
            b43_phy_write(dev, B43_PHY_LO_MASK, tmp);
            b43_phy_write(dev, B43_PHY_EXTG(0x01), sav->phy_extg_01);
            b43_phy_write(dev, B43_PHY_DACCTL, sav->phy_dacctl_hwpctl);
            b43_phy_write(dev, B43_PHY_BASE(0x14), sav->phy_base_14);
            b43_phy_write(dev, B43_PHY_HPWR_TSSICTL, sav->phy_hpwr_tssictl);
      }
      b43_radio_selectchannel(dev, sav->old_channel, 1);
}

struct b43_lo_g_statemachine {
      int current_state;
      int nr_measured;
      int state_val_multiplier;
      u16 lowest_feedth;
      struct b43_loctl min_loctl;
};

/* Loop over each possible value in this state. */
static int lo_probe_possible_loctls(struct b43_wldev *dev,
                            struct b43_loctl *probe_loctl,
                            struct b43_lo_g_statemachine *d)
{
      struct b43_phy *phy = &dev->phy;
      struct b43_txpower_lo_control *lo = phy->lo_control;
      struct b43_loctl test_loctl;
      struct b43_loctl orig_loctl;
      struct b43_loctl prev_loctl = {
            .i = -100,
            .q = -100,
      };
      int i;
      int begin, end;
      int found_lower = 0;
      u16 feedth;

      static const struct b43_loctl modifiers[] = {
            {.i = 1,.q = 1,},
            {.i = 1,.q = 0,},
            {.i = 1,.q = -1,},
            {.i = 0,.q = -1,},
            {.i = -1,.q = -1,},
            {.i = -1,.q = 0,},
            {.i = -1,.q = 1,},
            {.i = 0,.q = 1,},
      };

      if (d->current_state == 0) {
            begin = 1;
            end = 8;
      } else if (d->current_state % 2 == 0) {
            begin = d->current_state - 1;
            end = d->current_state + 1;
      } else {
            begin = d->current_state - 2;
            end = d->current_state + 2;
      }
      if (begin < 1)
            begin += 8;
      if (end > 8)
            end -= 8;

      memcpy(&orig_loctl, probe_loctl, sizeof(struct b43_loctl));
      i = begin;
      d->current_state = i;
      while (1) {
            B43_WARN_ON(!(i >= 1 && i <= 8));
            memcpy(&test_loctl, &orig_loctl, sizeof(struct b43_loctl));
            test_loctl.i += modifiers[i - 1].i * d->state_val_multiplier;
            test_loctl.q += modifiers[i - 1].q * d->state_val_multiplier;
            if ((test_loctl.i != prev_loctl.i ||
                 test_loctl.q != prev_loctl.q) &&
                (abs(test_loctl.i) <= 16 && abs(test_loctl.q) <= 16)) {
                  b43_lo_write(dev, &test_loctl);
                  feedth = lo_measure_feedthrough(dev, phy->lna_gain,
                                          phy->pga_gain,
                                          phy->trsw_rx_gain);
                  if (feedth < d->lowest_feedth) {
                        memcpy(probe_loctl, &test_loctl,
                               sizeof(struct b43_loctl));
                        found_lower = 1;
                        d->lowest_feedth = feedth;
                        if ((d->nr_measured < 2) &&
                            (!has_loopback_gain(phy) || lo->rebuild))
                              break;
                  }
            }
            memcpy(&prev_loctl, &test_loctl, sizeof(prev_loctl));
            if (i == end)
                  break;
            if (i == 8)
                  i = 1;
            else
                  i++;
            d->current_state = i;
      }

      return found_lower;
}

static void lo_probe_loctls_statemachine(struct b43_wldev *dev,
                               struct b43_loctl *loctl,
                               int *max_rx_gain)
{
      struct b43_phy *phy = &dev->phy;
      struct b43_txpower_lo_control *lo = phy->lo_control;
      struct b43_lo_g_statemachine d;
      u16 feedth;
      int found_lower;
      struct b43_loctl probe_loctl;
      int max_repeat = 1, repeat_cnt = 0;

      d.nr_measured = 0;
      d.state_val_multiplier = 1;
      if (has_loopback_gain(phy) && !lo->rebuild)
            d.state_val_multiplier = 3;

      memcpy(&d.min_loctl, loctl, sizeof(struct b43_loctl));
      if (has_loopback_gain(phy) && lo->rebuild)
            max_repeat = 4;
      do {
            b43_lo_write(dev, &d.min_loctl);
            feedth = lo_measure_feedthrough(dev, phy->lna_gain,
                                    phy->pga_gain,
                                    phy->trsw_rx_gain);
            if (!lo->rebuild && feedth < 0x258) {
                  if (feedth >= 0x12C)
                        *max_rx_gain += 6;
                  else
                        *max_rx_gain += 3;
                  feedth = lo_measure_feedthrough(dev, phy->lna_gain,
                                          phy->pga_gain,
                                          phy->trsw_rx_gain);
            }
            d.lowest_feedth = feedth;

            d.current_state = 0;
            do {
                  B43_WARN_ON(!
                            (d.current_state >= 0
                             && d.current_state <= 8));
                  memcpy(&probe_loctl, &d.min_loctl,
                         sizeof(struct b43_loctl));
                  found_lower =
                      lo_probe_possible_loctls(dev, &probe_loctl, &d);
                  if (!found_lower)
                        break;
                  if ((probe_loctl.i == d.min_loctl.i) &&
                      (probe_loctl.q == d.min_loctl.q))
                        break;
                  memcpy(&d.min_loctl, &probe_loctl,
                         sizeof(struct b43_loctl));
                  d.nr_measured++;
            } while (d.nr_measured < 24);
            memcpy(loctl, &d.min_loctl, sizeof(struct b43_loctl));

            if (has_loopback_gain(phy)) {
                  if (d.lowest_feedth > 0x1194)
                        *max_rx_gain -= 6;
                  else if (d.lowest_feedth < 0x5DC)
                        *max_rx_gain += 3;
                  if (repeat_cnt == 0) {
                        if (d.lowest_feedth <= 0x5DC) {
                              d.state_val_multiplier = 1;
                              repeat_cnt++;
                        } else
                              d.state_val_multiplier = 2;
                  } else if (repeat_cnt == 2)
                        d.state_val_multiplier = 1;
            }
            lo_measure_gain_values(dev, *max_rx_gain,
                               has_loopback_gain(phy));
      } while (++repeat_cnt < max_repeat);
}

#if B43_CALIB_ALL_LOCTLS
static const struct b43_rfatt b43_full_rfatt_list_items[] = {
      { .att = 0, .with_padmix = 0, },
      { .att = 1, .with_padmix = 0, },
      { .att = 2, .with_padmix = 0, },
      { .att = 3, .with_padmix = 0, },
      { .att = 4, .with_padmix = 0, },
      { .att = 5, .with_padmix = 0, },
      { .att = 6, .with_padmix = 0, },
      { .att = 7, .with_padmix = 0, },
      { .att = 8, .with_padmix = 0, },
      { .att = 9, .with_padmix = 0, },
      { .att = 10, .with_padmix = 0, },
      { .att = 11, .with_padmix = 0, },
      { .att = 12, .with_padmix = 0, },
      { .att = 13, .with_padmix = 0, },
      { .att = 14, .with_padmix = 0, },
      { .att = 15, .with_padmix = 0, },
      { .att = 0, .with_padmix = 1, },
      { .att = 1, .with_padmix = 1, },
      { .att = 2, .with_padmix = 1, },
      { .att = 3, .with_padmix = 1, },
      { .att = 4, .with_padmix = 1, },
      { .att = 5, .with_padmix = 1, },
      { .att = 6, .with_padmix = 1, },
      { .att = 7, .with_padmix = 1, },
      { .att = 8, .with_padmix = 1, },
      { .att = 9, .with_padmix = 1, },
      { .att = 10, .with_padmix = 1, },
      { .att = 11, .with_padmix = 1, },
      { .att = 12, .with_padmix = 1, },
      { .att = 13, .with_padmix = 1, },
      { .att = 14, .with_padmix = 1, },
      { .att = 15, .with_padmix = 1, },
};
static const struct b43_rfatt_list b43_full_rfatt_list = {
      .list       = b43_full_rfatt_list_items,
      .len        = ARRAY_SIZE(b43_full_rfatt_list_items),
};

static const struct b43_bbatt b43_full_bbatt_list_items[] = {
      { .att = 0, },
      { .att = 1, },
      { .att = 2, },
      { .att = 3, },
      { .att = 4, },
      { .att = 5, },
      { .att = 6, },
      { .att = 7, },
      { .att = 8, },
      { .att = 9, },
      { .att = 10, },
      { .att = 11, },
};
static const struct b43_bbatt_list b43_full_bbatt_list = {
      .list       = b43_full_bbatt_list_items,
      .len        = ARRAY_SIZE(b43_full_bbatt_list_items),
};
#endif /* B43_CALIB_ALL_LOCTLS */

static void lo_measure(struct b43_wldev *dev)
{
      struct b43_phy *phy = &dev->phy;
      struct b43_txpower_lo_control *lo = phy->lo_control;
      struct b43_loctl loctl = {
            .i = 0,
            .q = 0,
      };
      struct b43_loctl *ploctl;
      int max_rx_gain;
      int rfidx, bbidx;
      const struct b43_bbatt_list *bbatt_list;
      const struct b43_rfatt_list *rfatt_list;

      /* Values from the "TXCTL Register and Value Table" */
      u16 txctl_reg;
      u16 txctl_value;
      u16 pad_mix_gain;

      bbatt_list = &lo->bbatt_list;
      rfatt_list = &lo->rfatt_list;
#if B43_CALIB_ALL_LOCTLS
      bbatt_list = &b43_full_bbatt_list;
      rfatt_list = &b43_full_rfatt_list;
#endif

      txctl_reg = lo_txctl_register_table(dev, &txctl_value, &pad_mix_gain);

      for (rfidx = 0; rfidx < rfatt_list->len; rfidx++) {

            b43_radio_write16(dev, 0x43, (b43_radio_read16(dev, 0x43)
                                    & 0xFFF0) |
                          rfatt_list->list[rfidx].att);
            b43_radio_write16(dev, txctl_reg,
                          (b43_radio_read16(dev, txctl_reg)
                           & ~txctl_value)
                          | (rfatt_list->list[rfidx].with_padmix ?
                             txctl_value : 0));

            for (bbidx = 0; bbidx < bbatt_list->len; bbidx++) {
                  if (lo->rebuild) {
#if B43_CALIB_ALL_LOCTLS
                        ploctl = b43_get_lo_g_ctl(dev,
                                            &rfatt_list->list[rfidx],
                                            &bbatt_list->list[bbidx]);
#else
                        ploctl = b43_get_lo_g_ctl_nopadmix(dev,
                                                   &rfatt_list->
                                                   list[rfidx],
                                                   &bbatt_list->
                                                   list[bbidx]);
#endif
                  } else {
                        ploctl = b43_get_lo_g_ctl(dev,
                                            &rfatt_list->list[rfidx],
                                            &bbatt_list->list[bbidx]);
                        if (!ploctl->used)
                              continue;
                  }
                  memcpy(&loctl, ploctl, sizeof(loctl));
                  loctl.i = 0;
                  loctl.q = 0;

                  max_rx_gain = rfatt_list->list[rfidx].att * 2;
                  max_rx_gain += bbatt_list->list[bbidx].att / 2;
                  if (rfatt_list->list[rfidx].with_padmix)
                        max_rx_gain -= pad_mix_gain;
                  if (has_loopback_gain(phy))
                        max_rx_gain += phy->max_lb_gain;
                  lo_measure_gain_values(dev, max_rx_gain,
                                     has_loopback_gain(phy));

                  b43_phy_set_baseband_attenuation(dev,
                                           bbatt_list->list[bbidx].att);
                  lo_probe_loctls_statemachine(dev, &loctl, &max_rx_gain);
                  if (phy->type == B43_PHYTYPE_B) {
                        loctl.i++;
                        loctl.q++;
                  }
                  b43_loctl_set_calibrated(&loctl, 1);
                  memcpy(ploctl, &loctl, sizeof(loctl));
            }
      }
}

#if B43_DEBUG
static void do_validate_loctl(struct b43_wldev *dev, struct b43_loctl *control)
{
      const int is_initializing = (b43_status(dev) == B43_STAT_UNINIT);
      int i = control->i;
      int q = control->q;

      if (b43_loctl_is_calibrated(control)) {
            if ((abs(i) > 16) || (abs(q) > 16))
                  goto error;
      } else {
            if (control->used)
                  goto error;
            if (dev->phy.lo_control->rebuild) {
                  control->i = 0;
                  control->q = 0;
                  if ((i != B43_LOCTL_POISON) ||
                      (q != B43_LOCTL_POISON))
                        goto error;
            }
      }
      if (is_initializing && control->used)
            goto error;

      return;
error:
      b43err(dev->wl, "LO control pair validation failed "
             "(I: %d, Q: %d, used %u, calib: %u, initing: %d)\n",
             i, q, control->used,
             b43_loctl_is_calibrated(control),
             is_initializing);
}

static void validate_all_loctls(struct b43_wldev *dev)
{
      b43_call_for_each_loctl(dev, do_validate_loctl);
}

static void do_reset_calib(struct b43_wldev *dev, struct b43_loctl *control)
{
      if (dev->phy.lo_control->rebuild ||
          control->used) {
            b43_loctl_set_calibrated(control, 0);
            control->i = B43_LOCTL_POISON;
            control->q = B43_LOCTL_POISON;
      }
}

static void reset_all_loctl_calibration_states(struct b43_wldev *dev)
{
      b43_call_for_each_loctl(dev, do_reset_calib);
}

#else /* B43_DEBUG */
static inline void validate_all_loctls(struct b43_wldev *dev) { }
static inline void reset_all_loctl_calibration_states(struct b43_wldev *dev) { }
#endif /* B43_DEBUG */

void b43_lo_g_measure(struct b43_wldev *dev)
{
      struct b43_phy *phy = &dev->phy;
      struct lo_g_saved_values uninitialized_var(sav);

      B43_WARN_ON((phy->type != B43_PHYTYPE_B) &&
                (phy->type != B43_PHYTYPE_G));

      sav.old_channel = phy->channel;
      lo_measure_setup(dev, &sav);
      reset_all_loctl_calibration_states(dev);
      lo_measure(dev);
      lo_measure_restore(dev, &sav);

      validate_all_loctls(dev);

      phy->lo_control->lo_measured = 1;
      phy->lo_control->rebuild = 0;
}

#if B43_DEBUG
static void validate_loctl_calibration(struct b43_wldev *dev,
                               struct b43_loctl *loctl,
                               struct b43_rfatt *rfatt,
                               struct b43_bbatt *bbatt)
{
      if (b43_loctl_is_calibrated(loctl))
            return;
      if (!dev->phy.lo_control->lo_measured) {
            /* On init we set the attenuation values before we
             * calibrated the LO. I guess that's OK. */
            return;
      }
      b43err(dev->wl, "Adjusting Local Oscillator to an uncalibrated "
             "control pair: rfatt=%u,%spadmix bbatt=%u\n",
             rfatt->att,
             (rfatt->with_padmix) ? "" : "no-",
             bbatt->att);
}
#else
static inline void validate_loctl_calibration(struct b43_wldev *dev,
                                    struct b43_loctl *loctl,
                                    struct b43_rfatt *rfatt,
                                    struct b43_bbatt *bbatt)
{
}
#endif

static inline void fixup_rfatt_for_txcontrol(struct b43_rfatt *rf,
                                   u8 tx_control)
{
      if (tx_control & B43_TXCTL_TXMIX) {
            if (rf->att < 5)
                  rf->att = 4;
      }
}

void b43_lo_g_adjust(struct b43_wldev *dev)
{
      struct b43_phy *phy = &dev->phy;
      struct b43_rfatt rf;
      struct b43_loctl *loctl;

      memcpy(&rf, &phy->rfatt, sizeof(rf));
      fixup_rfatt_for_txcontrol(&rf, phy->tx_control);

      loctl = b43_get_lo_g_ctl(dev, &rf, &phy->bbatt);
      validate_loctl_calibration(dev, loctl, &rf, &phy->bbatt);
      b43_lo_write(dev, loctl);
}

void b43_lo_g_adjust_to(struct b43_wldev *dev,
                  u16 rfatt, u16 bbatt, u16 tx_control)
{
      struct b43_rfatt rf;
      struct b43_bbatt bb;
      struct b43_loctl *loctl;

      memset(&rf, 0, sizeof(rf));
      memset(&bb, 0, sizeof(bb));
      rf.att = rfatt;
      bb.att = bbatt;
      fixup_rfatt_for_txcontrol(&rf, tx_control);
      loctl = b43_get_lo_g_ctl(dev, &rf, &bb);
      validate_loctl_calibration(dev, loctl, &rf, &bb);
      b43_lo_write(dev, loctl);
}

static void do_mark_unused(struct b43_wldev *dev, struct b43_loctl *control)
{
      control->used = 0;
}

void b43_lo_g_ctl_mark_all_unused(struct b43_wldev *dev)
{
      struct b43_phy *phy = &dev->phy;
      struct b43_txpower_lo_control *lo = phy->lo_control;

      b43_call_for_each_loctl(dev, do_mark_unused);
      lo->rebuild = 1;
}

void b43_lo_g_ctl_mark_cur_used(struct b43_wldev *dev)
{
      struct b43_phy *phy = &dev->phy;
      struct b43_rfatt rf;

      memcpy(&rf, &phy->rfatt, sizeof(rf));
      fixup_rfatt_for_txcontrol(&rf, phy->tx_control);

      b43_get_lo_g_ctl(dev, &rf, &phy->bbatt)->used = 1;
}

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