lo.c

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/*

  Broadcom B43 wireless driver

  G PHY LO (LocalOscillator) Measuring and Control routines

  Copyright (c) 2005 Martin Langer <[email protected]>,
  Copyright (c) 2005, 2006 Stefano Brivio <[email protected]>
  Copyright (c) 2005-2007 Michael Buesch <[email protected]>
  Copyright (c) 2005, 2006 Danny van Dyk <[email protected]>
  Copyright (c) 2005, 2006 Andreas Jaggi <[email protected]>

  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_g.h"
#include "main.h"

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


static struct b43_lo_calib *b43_find_lo_calib(struct b43_txpower_lo_control *lo,
                          const struct b43_bbatt *bbatt,
                           const struct b43_rfatt *rfatt)
{
    struct b43_lo_calib *c;

    list_for_each_entry(c, &lo->calib_list, list) {
        if (!b43_compare_bbatt(&c->bbatt, bbatt))
            continue;
        if (!b43_compare_rfatt(&c->rfatt, rfatt))
            continue;
        return c;
    }

    return NULL;
}

/* 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;

    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;
        }
    }
    B43_WARN_ON(phy->type != B43_PHYTYPE_G);

    value = (u8) (control->q);
    value |= ((u8) (control->i)) << 8;
    b43_phy_write(dev, B43_PHY_LO_CTL, value);
}

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->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_phy_g *gphy = phy->g;
    struct b43_txpower_lo_control *lo = gphy->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 = gphy->max_lb_gain / 2;
        if (lb_gain > 10) {
            radio_pctl_reg = 0;
            pga = abs(10 - lb_gain) / 6;
            pga = clamp_val(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_maskset(dev, 0x43, 0xFFF0, radio_pctl_reg);
    b43_gphy_set_baseband_attenuation(dev, 2);

    reg = lo_txctl_register_table(dev, &mask, NULL);
    mask = ~mask;
    b43_radio_mask(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_maskset(dev, 0x52, 0xFF0F, tx_magn);
            for (j = 0; j < ARRAY_SIZE(tx_bias_values); j++) {
                tx_bias = tx_bias_values[j];
                b43_radio_maskset(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_mask(dev, 0x52, 0xFFF0);  /* TX bias == 0 */
    }
    lo->txctl_measured_time = jiffies;
}

static void lo_read_power_vector(struct b43_wldev *dev)
{
    struct b43_phy *phy = &dev->phy;
    struct b43_phy_g *gphy = phy->g;
    struct b43_txpower_lo_control *lo = gphy->lo_control;
    int i;
    u64 tmp;
    u64 power_vector = 0;

    for (i = 0; i < 8; i += 2) {
        tmp = b43_shm_read16(dev, B43_SHM_SHARED, 0x310 + i);
        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;
    lo->pwr_vec_read_time = jiffies;
}

/* 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;
    struct b43_phy_g *gphy = phy->g;
    u16 tmp;

    if (max_rx_gain < 0)
        max_rx_gain = 0;

    if (has_loopback_gain(phy)) {
        int trsw_rx_gain;

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

    tmp = b43_radio_read16(dev, 0x7A);
    if (gphy->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_cck_14;
    u16 phy_hpwr_tssictl;
    u16 phy_analogover;
    u16 phy_analogoverval;
    u16 phy_rfover;
    u16 phy_rfoverval;
    u16 phy_classctl;
    u16 phy_cck_3E;
    u16 phy_crs0;
    u16 phy_pgactl;
    u16 phy_cck_2A;
    u16 phy_syncctl;
    u16 phy_cck_30;
    u16 phy_cck_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_phy_g *gphy = phy->g;
    struct b43_txpower_lo_control *lo = gphy->lo_control;
    u16 tmp;

    if (b43_has_hardware_pctl(dev)) {
        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_cck_14 = b43_phy_read(dev, B43_PHY_CCK(0x14));
        sav->phy_hpwr_tssictl = b43_phy_read(dev, B43_PHY_HPWR_TSSICTL);

        b43_phy_set(dev, B43_PHY_HPWR_TSSICTL, 0x100);
        b43_phy_set(dev, B43_PHY_EXTG(0x01), 0x40);
        b43_phy_set(dev, B43_PHY_DACCTL, 0x40);
        b43_phy_set(dev, B43_PHY_CCK(0x14), 0x200);
    }
    if (phy->type == B43_PHYTYPE_B &&
        phy->radio_ver == 0x2050 && phy->radio_rev < 6) {
        b43_phy_write(dev, B43_PHY_CCK(0x16), 0x410);
        b43_phy_write(dev, B43_PHY_CCK(0x17), 0x820);
    }
    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_cck_3E = b43_phy_read(dev, B43_PHY_CCK(0x3E));
        sav->phy_crs0 = b43_phy_read(dev, B43_PHY_CRS0);

        b43_phy_mask(dev, B43_PHY_CLASSCTL, 0xFFFC);
        b43_phy_mask(dev, B43_PHY_CRS0, 0x7FFF);
        b43_phy_set(dev, B43_PHY_ANALOGOVER, 0x0003);
        b43_phy_mask(dev, B43_PHY_ANALOGOVERVAL, 0xFFFC);
        if (phy->type == B43_PHYTYPE_G) {
            if ((phy->rev >= 7) &&
                (sprom->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_CCK(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_cck_2A = b43_phy_read(dev, B43_PHY_CCK(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_cck_30 = b43_phy_read(dev, B43_PHY_CCK(0x30));
        sav->phy_cck_06 = b43_phy_read(dev, B43_PHY_CCK(0x06));
        b43_phy_write(dev, B43_PHY_CCK(0x30), 0x00FF);
        b43_phy_write(dev, B43_PHY_CCK(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_CCK(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_CCK(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_CCK(0x2B), 0x1003);
    } else
        b43_phy_write(dev, B43_PHY_CCK(0x2B), 0x0802);
    if (phy->rev >= 2)
        b43_dummy_transmission(dev, false, true);
    b43_gphy_channel_switch(dev, 6, 0);
    b43_radio_read16(dev, 0x51);    /* dummy read */
    if (phy->type == B43_PHYTYPE_G)
        b43_phy_write(dev, B43_PHY_CCK(0x2F), 0);

    /* Re-measure the txctl values, if needed. */
    if (time_before(lo->txctl_measured_time,
            jiffies - B43_LO_TXCTL_EXPIRE))
        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_CCK(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_phy_g *gphy = phy->g;
    u16 tmp;

    if (phy->rev >= 2) {
        b43_phy_write(dev, B43_PHY_PGACTL, 0xE300);
        tmp = (gphy->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 = (gphy->pga_gain | 0xEFA0);
        b43_phy_write(dev, B43_PHY_PGACTL, tmp);
    }
    if (phy->type == B43_PHYTYPE_G) {
        if (phy->rev >= 3)
            b43_phy_write(dev, B43_PHY_CCK(0x2E), 0xC078);
        else
            b43_phy_write(dev, B43_PHY_CCK(0x2E), 0x8078);
        if (phy->rev >= 2)
            b43_phy_write(dev, B43_PHY_CCK(0x2F), 0x0202);
        else
            b43_phy_write(dev, B43_PHY_CCK(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_CCK(0x2A), sav->phy_cck_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_maskset(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_CCK(0x30), sav->phy_cck_30);
        b43_phy_write(dev, B43_PHY_CCK(0x06), sav->phy_cck_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_CCK(0x3E), sav->phy_cck_3E);
        b43_phy_write(dev, B43_PHY_CRS0, sav->phy_crs0);
    }
    if (b43_has_hardware_pctl(dev)) {
        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_CCK(0x14), sav->phy_cck_14);
        b43_phy_write(dev, B43_PHY_HPWR_TSSICTL, sav->phy_hpwr_tssictl);
    }
    b43_gphy_channel_switch(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_phy_g *gphy = phy->g;
    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, gphy->lna_gain,
                            gphy->pga_gain,
                            gphy->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))
                    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_phy_g *gphy = phy->g;
    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))
        d.state_val_multiplier = 3;

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

static
struct b43_lo_calib *b43_calibrate_lo_setting(struct b43_wldev *dev,
                          const struct b43_bbatt *bbatt,
                          const struct b43_rfatt *rfatt)
{
    struct b43_phy *phy = &dev->phy;
    struct b43_phy_g *gphy = phy->g;
    struct b43_loctl loctl = {
        .i = 0,
        .q = 0,
    };
    int max_rx_gain;
    struct b43_lo_calib *cal;
    struct lo_g_saved_values uninitialized_var(saved_regs);
    /* Values from the "TXCTL Register and Value Table" */
    u16 txctl_reg;
    u16 txctl_value;
    u16 pad_mix_gain;

    saved_regs.old_channel = phy->channel;
    b43_mac_suspend(dev);
    lo_measure_setup(dev, &saved_regs);

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

    b43_radio_maskset(dev, 0x43, 0xFFF0, rfatt->att);
    b43_radio_maskset(dev, txctl_reg, ~txctl_value, (rfatt->with_padmix ? txctl_value :0));

    max_rx_gain = rfatt->att * 2;
    max_rx_gain += bbatt->att / 2;
    if (rfatt->with_padmix)
        max_rx_gain -= pad_mix_gain;
    if (has_loopback_gain(phy))
        max_rx_gain += gphy->max_lb_gain;
    lo_measure_gain_values(dev, max_rx_gain,
                   has_loopback_gain(phy));

    b43_gphy_set_baseband_attenuation(dev, bbatt->att);
    lo_probe_loctls_statemachine(dev, &loctl, &max_rx_gain);

    lo_measure_restore(dev, &saved_regs);
    b43_mac_enable(dev);

    if (b43_debug(dev, B43_DBG_LO)) {
        b43dbg(dev->wl, "LO: Calibrated for BB(%u), RF(%u,%u) "
               "=> I=%d Q=%d\n",
               bbatt->att, rfatt->att, rfatt->with_padmix,
               loctl.i, loctl.q);
    }

    cal = kmalloc(sizeof(*cal), GFP_KERNEL);
    if (!cal) {
        b43warn(dev->wl, "LO calib: out of memory\n");
        return NULL;
    }
    memcpy(&cal->bbatt, bbatt, sizeof(*bbatt));
    memcpy(&cal->rfatt, rfatt, sizeof(*rfatt));
    memcpy(&cal->ctl, &loctl, sizeof(loctl));
    cal->calib_time = jiffies;
    INIT_LIST_HEAD(&cal->list);

    return cal;
}

/* Get a calibrated LO setting for the given attenuation values.
 * Might return a NULL pointer under OOM! */
static
struct b43_lo_calib *b43_get_calib_lo_settings(struct b43_wldev *dev,
                           const struct b43_bbatt *bbatt,
                           const struct b43_rfatt *rfatt)
{
    struct b43_txpower_lo_control *lo = dev->phy.g->lo_control;
    struct b43_lo_calib *c;

    c = b43_find_lo_calib(lo, bbatt, rfatt);
    if (c)
        return c;
    /* Not in the list of calibrated LO settings.
     * Calibrate it now. */
    c = b43_calibrate_lo_setting(dev, bbatt, rfatt);
    if (!c)
        return NULL;
    list_add(&c->list, &lo->calib_list);

    return c;
}

void b43_gphy_dc_lt_init(struct b43_wldev *dev, bool update_all)
{
    struct b43_phy *phy = &dev->phy;
    struct b43_phy_g *gphy = phy->g;
    struct b43_txpower_lo_control *lo = gphy->lo_control;
    int i;
    int rf_offset, bb_offset;
    const struct b43_rfatt *rfatt;
    const struct b43_bbatt *bbatt;
    u64 power_vector;
    bool table_changed = false;

    BUILD_BUG_ON(B43_DC_LT_SIZE != 32);
    B43_WARN_ON(lo->rfatt_list.len * lo->bbatt_list.len > 64);

    power_vector = lo->power_vector;
    if (!update_all && !power_vector)
        return; /* Nothing to do. */

    /* Suspend the MAC now to avoid continuous suspend/enable
     * cycles in the loop. */
    b43_mac_suspend(dev);

    for (i = 0; i < B43_DC_LT_SIZE * 2; i++) {
        struct b43_lo_calib *cal;
        int idx;
        u16 val;

        if (!update_all && !(power_vector & (((u64)1ULL) << i)))
            continue;
        /* Update the table entry for this power_vector bit.
         * The table rows are RFatt entries and columns are BBatt. */
        bb_offset = i / lo->rfatt_list.len;
        rf_offset = i % lo->rfatt_list.len;
        bbatt = &(lo->bbatt_list.list[bb_offset]);
        rfatt = &(lo->rfatt_list.list[rf_offset]);

        cal = b43_calibrate_lo_setting(dev, bbatt, rfatt);
        if (!cal) {
            b43warn(dev->wl, "LO: Could not "
                "calibrate DC table entry\n");
            continue;
        }
        /*FIXME: Is Q really in the low nibble? */
        val = (u8)(cal->ctl.q);
        val |= ((u8)(cal->ctl.i)) << 4;
        kfree(cal);

        /* Get the index into the hardware DC LT. */
        idx = i / 2;
        /* Change the table in memory. */
        if (i % 2) {
            /* Change the high byte. */
            lo->dc_lt[idx] = (lo->dc_lt[idx] & 0x00FF)
                     | ((val & 0x00FF) << 8);
        } else {
            /* Change the low byte. */
            lo->dc_lt[idx] = (lo->dc_lt[idx] & 0xFF00)
                     | (val & 0x00FF);
        }
        table_changed = true;
    }
    if (table_changed) {
        /* The table changed in memory. Update the hardware table. */
        for (i = 0; i < B43_DC_LT_SIZE; i++)
            b43_phy_write(dev, 0x3A0 + i, lo->dc_lt[i]);
    }
    b43_mac_enable(dev);
}

/* Fixup the RF attenuation value for the case where we are
 * using the PAD mixer. */
static inline void b43_lo_fixup_rfatt(struct b43_rfatt *rf)
{
    if (!rf->with_padmix)
        return;
    if ((rf->att != 1) && (rf->att != 2) && (rf->att != 3))
        rf->att = 4;
}

void b43_lo_g_adjust(struct b43_wldev *dev)
{
    struct b43_phy_g *gphy = dev->phy.g;
    struct b43_lo_calib *cal;
    struct b43_rfatt rf;

    memcpy(&rf, &gphy->rfatt, sizeof(rf));
    b43_lo_fixup_rfatt(&rf);

    cal = b43_get_calib_lo_settings(dev, &gphy->bbatt, &rf);
    if (!cal)
        return;
    b43_lo_write(dev, &cal->ctl);
}

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_lo_calib *cal;

    memset(&rf, 0, sizeof(rf));
    memset(&bb, 0, sizeof(bb));
    rf.att = rfatt;
    bb.att = bbatt;
    b43_lo_fixup_rfatt(&rf);
    cal = b43_get_calib_lo_settings(dev, &bb, &rf);
    if (!cal)
        return;
    b43_lo_write(dev, &cal->ctl);
}

/* Periodic LO maintanance work */
void b43_lo_g_maintanance_work(struct b43_wldev *dev)
{
    struct b43_phy *phy = &dev->phy;
    struct b43_phy_g *gphy = phy->g;
    struct b43_txpower_lo_control *lo = gphy->lo_control;
    unsigned long now;
    unsigned long expire;
    struct b43_lo_calib *cal, *tmp;
    bool current_item_expired = false;
    bool hwpctl;

    if (!lo)
        return;
    now = jiffies;
    hwpctl = b43_has_hardware_pctl(dev);

    if (hwpctl) {
        /* Read the power vector and update it, if needed. */
        expire = now - B43_LO_PWRVEC_EXPIRE;
        if (time_before(lo->pwr_vec_read_time, expire)) {
            lo_read_power_vector(dev);
            b43_gphy_dc_lt_init(dev, 0);
        }
        //FIXME Recalc the whole DC table from time to time?
    }

    if (hwpctl)
        return;
    /* Search for expired LO settings. Remove them.
     * Recalibrate the current setting, if expired. */
    expire = now - B43_LO_CALIB_EXPIRE;
    list_for_each_entry_safe(cal, tmp, &lo->calib_list, list) {
        if (!time_before(cal->calib_time, expire))
            continue;
        /* This item expired. */
        if (b43_compare_bbatt(&cal->bbatt, &gphy->bbatt) &&
            b43_compare_rfatt(&cal->rfatt, &gphy->rfatt)) {
            B43_WARN_ON(current_item_expired);
            current_item_expired = true;
        }
        if (b43_debug(dev, B43_DBG_LO)) {
            b43dbg(dev->wl, "LO: Item BB(%u), RF(%u,%u), "
                   "I=%d, Q=%d expired\n",
                   cal->bbatt.att, cal->rfatt.att,
                   cal->rfatt.with_padmix,
                   cal->ctl.i, cal->ctl.q);
        }
        list_del(&cal->list);
        kfree(cal);
    }
    if (current_item_expired || unlikely(list_empty(&lo->calib_list))) {
        /* Recalibrate currently used LO setting. */
        if (b43_debug(dev, B43_DBG_LO))
            b43dbg(dev->wl, "LO: Recalibrating current LO setting\n");
        cal = b43_calibrate_lo_setting(dev, &gphy->bbatt, &gphy->rfatt);
        if (cal) {
            list_add(&cal->list, &lo->calib_list);
            b43_lo_write(dev, &cal->ctl);
        } else
            b43warn(dev->wl, "Failed to recalibrate current LO setting\n");
    }
}

void b43_lo_g_cleanup(struct b43_wldev *dev)
{
    struct b43_txpower_lo_control *lo = dev->phy.g->lo_control;
    struct b43_lo_calib *cal, *tmp;

    if (!lo)
        return;
    list_for_each_entry_safe(cal, tmp, &lo->calib_list, list) {
        list_del(&cal->list);
        kfree(cal);
    }
}

/* LO Initialization */
void b43_lo_g_init(struct b43_wldev *dev)
{
    if (b43_has_hardware_pctl(dev)) {
        lo_read_power_vector(dev);
        b43_gphy_dc_lt_init(dev, 1);
    }
}