ath5k_phy.c

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/*
 * PHY functions
 *
 * Copyright (c) 2004-2007 Reyk Floeter <reyk@openbsd.org>
 * Copyright (c) 2006-2009 Nick Kossifidis <mickflemm@gmail.com>
 * Copyright (c) 2007-2008 Jiri Slaby <jirislaby@gmail.com>
 * Copyright (c) 2008-2009 Felix Fietkau <nbd@openwrt.org>
 *
 * Lightly modified for gPXE, July 2009, by Joshua Oreman <oremanj@rwcr.net>.
 *
 * Permission to use, copy, modify, and 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.
 *
 */

FILE_LICENCE ( MIT );

#define _ATH5K_PHY

#include <unistd.h>
#include <stdlib.h>

#include "ath5k.h"
#include "reg.h"
#include "base.h"
#include "rfbuffer.h"
#include "rfgain.h"

static inline int min(int x, int y)
{
        return (x < y) ? x : y;
}

static inline int max(int x, int y)
{
        return (x > y) ? x : y;
}

/*
 * Used to modify RF Banks before writing them to AR5K_RF_BUFFER
 */
static unsigned int ath5k_hw_rfb_op(struct ath5k_hw *ah,
                                        const struct ath5k_rf_reg *rf_regs,
                                        u32 val, u8 reg_id, int set)
{
        const struct ath5k_rf_reg *rfreg = NULL;
        u8 offset, bank, num_bits, col, position;
        u16 entry;
        u32 mask, data, last_bit, bits_shifted, first_bit;
        u32 *rfb;
        s32 bits_left;
        unsigned i;

        data = 0;
        rfb = ah->ah_rf_banks;

        for (i = 0; i < ah->ah_rf_regs_count; i++) {
                if (rf_regs[i].index == reg_id) {
                        rfreg = &rf_regs[i];
                        break;
                }
        }

        if (rfb == NULL || rfreg == NULL) {
                DBG("ath5k: RF register not found!\n");
                /* should not happen */
                return 0;
        }

        bank = rfreg->bank;
        num_bits = rfreg->field.len;
        first_bit = rfreg->field.pos;
        col = rfreg->field.col;

        /* first_bit is an offset from bank's
         * start. Since we have all banks on
         * the same array, we use this offset
         * to mark each bank's start */
        offset = ah->ah_offset[bank];

        /* Boundary check */
        if (!(col <= 3 && num_bits <= 32 && first_bit + num_bits <= 319)) {
                DBG("ath5k: RF invalid values at offset %d\n", offset);
                return 0;
        }

        entry = ((first_bit - 1) / 8) + offset;
        position = (first_bit - 1) % 8;

        if (set)
                data = ath5k_hw_bitswap(val, num_bits);

        for (bits_shifted = 0, bits_left = num_bits; bits_left > 0;
        position = 0, entry++) {

                last_bit = (position + bits_left > 8) ? 8 :
                                        position + bits_left;

                mask = (((1 << last_bit) - 1) ^ ((1 << position) - 1)) <<
                                                                (col * 8);

                if (set) {
                        rfb[entry] &= ~mask;
                        rfb[entry] |= ((data << position) << (col * 8)) & mask;
                        data >>= (8 - position);
                } else {
                        data |= (((rfb[entry] & mask) >> (col * 8)) >> position)
                                << bits_shifted;
                        bits_shifted += last_bit - position;
                }

                bits_left -= 8 - position;
        }

        data = set ? 1 : ath5k_hw_bitswap(data, num_bits);

        return data;
}

/**********************\
* RF Gain optimization *
\**********************/

/*
 * This code is used to optimize rf gain on different environments
 * (temprature mostly) based on feedback from a power detector.
 *
 * It's only used on RF5111 and RF5112, later RF chips seem to have
 * auto adjustment on hw -notice they have a much smaller BANK 7 and
 * no gain optimization ladder-.
 *
 * For more infos check out this patent doc
 * http://www.freepatentsonline.com/7400691.html
 *
 * This paper describes power drops as seen on the receiver due to
 * probe packets
 * http://www.cnri.dit.ie/publications/ICT08%20-%20Practical%20Issues
 * %20of%20Power%20Control.pdf
 *
 * And this is the MadWiFi bug entry related to the above
 * http://madwifi-project.org/ticket/1659
 * with various measurements and diagrams
 *
 * TODO: Deal with power drops due to probes by setting an apropriate
 * tx power on the probe packets ! Make this part of the calibration process.
 */

/* Initialize ah_gain durring attach */
int ath5k_hw_rfgain_opt_init(struct ath5k_hw *ah)
{
        /* Initialize the gain optimization values */
        switch (ah->ah_radio) {
        case AR5K_RF5111:
                ah->ah_gain.g_step_idx = rfgain_opt_5111.go_default;
                ah->ah_gain.g_low = 20;
                ah->ah_gain.g_high = 35;
                ah->ah_gain.g_state = AR5K_RFGAIN_ACTIVE;
                break;
        case AR5K_RF5112:
                ah->ah_gain.g_step_idx = rfgain_opt_5112.go_default;
                ah->ah_gain.g_low = 20;
                ah->ah_gain.g_high = 85;
                ah->ah_gain.g_state = AR5K_RFGAIN_ACTIVE;
                break;
        default:
                return -EINVAL;
        }

        return 0;
}

/* Schedule a gain probe check on the next transmited packet.
 * That means our next packet is going to be sent with lower
 * tx power and a Peak to Average Power Detector (PAPD) will try
 * to measure the gain.
 *
 * TODO: Use propper tx power setting for the probe packet so
 * that we don't observe a serious power drop on the receiver
 *
 * XXX:  How about forcing a tx packet (bypassing PCU arbitrator etc)
 * just after we enable the probe so that we don't mess with
 * standard traffic ? Maybe it's time to use sw interrupts and
 * a probe tasklet !!!
 */
static void ath5k_hw_request_rfgain_probe(struct ath5k_hw *ah)
{

        /* Skip if gain calibration is inactive or
         * we already handle a probe request */
        if (ah->ah_gain.g_state != AR5K_RFGAIN_ACTIVE)
                return;

        /* Send the packet with 2dB below max power as
         * patent doc suggest */
        ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txpower.txp_max_pwr - 4,
                        AR5K_PHY_PAPD_PROBE_TXPOWER) |
                        AR5K_PHY_PAPD_PROBE_TX_NEXT, AR5K_PHY_PAPD_PROBE);

        ah->ah_gain.g_state = AR5K_RFGAIN_READ_REQUESTED;

}

/* Calculate gain_F measurement correction
 * based on the current step for RF5112 rev. 2 */
static u32 ath5k_hw_rf_gainf_corr(struct ath5k_hw *ah)
{
        u32 mix, step;
        u32 *rf;
        const struct ath5k_gain_opt *go;
        const struct ath5k_gain_opt_step *g_step;
        const struct ath5k_rf_reg *rf_regs;

        /* Only RF5112 Rev. 2 supports it */
        if ((ah->ah_radio != AR5K_RF5112) ||
        (ah->ah_radio_5ghz_revision <= AR5K_SREV_RAD_5112A))
                return 0;

        go = &rfgain_opt_5112;
        rf_regs = rf_regs_5112a;
        ah->ah_rf_regs_count = ARRAY_SIZE(rf_regs_5112a);

        g_step = &go->go_step[ah->ah_gain.g_step_idx];

        if (ah->ah_rf_banks == NULL)
                return 0;

        rf = ah->ah_rf_banks;
        ah->ah_gain.g_f_corr = 0;

        /* No VGA (Variable Gain Amplifier) override, skip */
        if (ath5k_hw_rfb_op(ah, rf_regs, 0, AR5K_RF_MIXVGA_OVR, 0) != 1)
                return 0;

        /* Mix gain stepping */
        step = ath5k_hw_rfb_op(ah, rf_regs, 0, AR5K_RF_MIXGAIN_STEP, 0);

        /* Mix gain override */
        mix = g_step->gos_param[0];

        switch (mix) {
        case 3:
                ah->ah_gain.g_f_corr = step * 2;
                break;
        case 2:
                ah->ah_gain.g_f_corr = (step - 5) * 2;
                break;
        case 1:
                ah->ah_gain.g_f_corr = step;
                break;
        default:
                ah->ah_gain.g_f_corr = 0;
                break;
        }

        return ah->ah_gain.g_f_corr;
}

/* Check if current gain_F measurement is in the range of our
 * power detector windows. If we get a measurement outside range
 * we know it's not accurate (detectors can't measure anything outside
 * their detection window) so we must ignore it */
static int ath5k_hw_rf_check_gainf_readback(struct ath5k_hw *ah)
{
        const struct ath5k_rf_reg *rf_regs;
        u32 step, mix_ovr, level[4];
        u32 *rf;

        if (ah->ah_rf_banks == NULL)
                return 0;

        rf = ah->ah_rf_banks;

        if (ah->ah_radio == AR5K_RF5111) {

                rf_regs = rf_regs_5111;
                ah->ah_rf_regs_count = ARRAY_SIZE(rf_regs_5111);

                step = ath5k_hw_rfb_op(ah, rf_regs, 0, AR5K_RF_RFGAIN_STEP,
                        0);

                level[0] = 0;
                level[1] = (step == 63) ? 50 : step + 4;
                level[2] = (step != 63) ? 64 : level[0];
                level[3] = level[2] + 50 ;

                ah->ah_gain.g_high = level[3] -
                        (step == 63 ? AR5K_GAIN_DYN_ADJUST_HI_MARGIN : -5);
                ah->ah_gain.g_low = level[0] +
                        (step == 63 ? AR5K_GAIN_DYN_ADJUST_LO_MARGIN : 0);
        } else {

                rf_regs = rf_regs_5112;
                ah->ah_rf_regs_count = ARRAY_SIZE(rf_regs_5112);

                mix_ovr = ath5k_hw_rfb_op(ah, rf_regs, 0, AR5K_RF_MIXVGA_OVR,
                        0);

                level[0] = level[2] = 0;

                if (mix_ovr == 1) {
                        level[1] = level[3] = 83;
                } else {
                        level[1] = level[3] = 107;
                        ah->ah_gain.g_high = 55;
                }
        }

        return (ah->ah_gain.g_current >= level[0] &&
                        ah->ah_gain.g_current <= level[1]) ||
                (ah->ah_gain.g_current >= level[2] &&
                        ah->ah_gain.g_current <= level[3]);
}

/* Perform gain_F adjustment by choosing the right set
 * of parameters from rf gain optimization ladder */
static s8 ath5k_hw_rf_gainf_adjust(struct ath5k_hw *ah)
{
        const struct ath5k_gain_opt *go;
        const struct ath5k_gain_opt_step *g_step;
        int ret = 0;

        switch (ah->ah_radio) {
        case AR5K_RF5111:
                go = &rfgain_opt_5111;
                break;
        case AR5K_RF5112:
                go = &rfgain_opt_5112;
                break;
        default:
                return 0;
        }

        g_step = &go->go_step[ah->ah_gain.g_step_idx];

        if (ah->ah_gain.g_current >= ah->ah_gain.g_high) {

                /* Reached maximum */
                if (ah->ah_gain.g_step_idx == 0)
                        return -1;

                for (ah->ah_gain.g_target = ah->ah_gain.g_current;
                                ah->ah_gain.g_target >=  ah->ah_gain.g_high &&
                                ah->ah_gain.g_step_idx > 0;
                                g_step = &go->go_step[ah->ah_gain.g_step_idx])
                        ah->ah_gain.g_target -= 2 *
                            (go->go_step[--(ah->ah_gain.g_step_idx)].gos_gain -
                            g_step->gos_gain);

                ret = 1;
                goto done;
        }

        if (ah->ah_gain.g_current <= ah->ah_gain.g_low) {

                /* Reached minimum */
                if (ah->ah_gain.g_step_idx == (go->go_steps_count - 1))
                        return -2;

                for (ah->ah_gain.g_target = ah->ah_gain.g_current;
                                ah->ah_gain.g_target <= ah->ah_gain.g_low &&
                                ah->ah_gain.g_step_idx < go->go_steps_count-1;
                                g_step = &go->go_step[ah->ah_gain.g_step_idx])
                        ah->ah_gain.g_target -= 2 *
                            (go->go_step[++ah->ah_gain.g_step_idx].gos_gain -
                            g_step->gos_gain);

                ret = 2;
                goto done;
        }

done:
        DBG2("ath5k RF adjust: ret %d, gain step %d, current gain %d, "
             "target gain %d\n", ret, ah->ah_gain.g_step_idx,
             ah->ah_gain.g_current, ah->ah_gain.g_target);

        return ret;
}

/* Main callback for thermal rf gain calibration engine
 * Check for a new gain reading and schedule an adjustment
 * if needed.
 *
 * TODO: Use sw interrupt to schedule reset if gain_F needs
 * adjustment */
enum ath5k_rfgain ath5k_hw_gainf_calibrate(struct ath5k_hw *ah)
{
        u32 data, type;
        struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;

        if (ah->ah_rf_banks == NULL ||
        ah->ah_gain.g_state == AR5K_RFGAIN_INACTIVE)
                return AR5K_RFGAIN_INACTIVE;

        /* No check requested, either engine is inactive
         * or an adjustment is already requested */
        if (ah->ah_gain.g_state != AR5K_RFGAIN_READ_REQUESTED)
                goto done;

        /* Read the PAPD (Peak to Average Power Detector)
         * register */
        data = ath5k_hw_reg_read(ah, AR5K_PHY_PAPD_PROBE);

        /* No probe is scheduled, read gain_F measurement */
        if (!(data & AR5K_PHY_PAPD_PROBE_TX_NEXT)) {
                ah->ah_gain.g_current = data >> AR5K_PHY_PAPD_PROBE_GAINF_S;
                type = AR5K_REG_MS(data, AR5K_PHY_PAPD_PROBE_TYPE);

                /* If tx packet is CCK correct the gain_F measurement
                 * by cck ofdm gain delta */
                if (type == AR5K_PHY_PAPD_PROBE_TYPE_CCK) {
                        if (ah->ah_radio_5ghz_revision >= AR5K_SREV_RAD_5112A)
                                ah->ah_gain.g_current +=
                                        ee->ee_cck_ofdm_gain_delta;
                        else
                                ah->ah_gain.g_current +=
                                        AR5K_GAIN_CCK_PROBE_CORR;
                }

                /* Further correct gain_F measurement for
                 * RF5112A radios */
                if (ah->ah_radio_5ghz_revision >= AR5K_SREV_RAD_5112A) {
                        ath5k_hw_rf_gainf_corr(ah);
                        ah->ah_gain.g_current =
                                ah->ah_gain.g_current >= ah->ah_gain.g_f_corr ?
                                (ah->ah_gain.g_current-ah->ah_gain.g_f_corr) :
                                0;
                }

                /* Check if measurement is ok and if we need
                 * to adjust gain, schedule a gain adjustment,
                 * else switch back to the acive state */
                if (ath5k_hw_rf_check_gainf_readback(ah) &&
                AR5K_GAIN_CHECK_ADJUST(&ah->ah_gain) &&
                ath5k_hw_rf_gainf_adjust(ah)) {
                        ah->ah_gain.g_state = AR5K_RFGAIN_NEED_CHANGE;
                } else {
                        ah->ah_gain.g_state = AR5K_RFGAIN_ACTIVE;
                }
        }

done:
        return ah->ah_gain.g_state;
}

/* Write initial rf gain table to set the RF sensitivity
 * this one works on all RF chips and has nothing to do
 * with gain_F calibration */
int ath5k_hw_rfgain_init(struct ath5k_hw *ah, unsigned int freq)
{
        const struct ath5k_ini_rfgain *ath5k_rfg;
        unsigned int i, size;

        switch (ah->ah_radio) {
        case AR5K_RF5111:
                ath5k_rfg = rfgain_5111;
                size = ARRAY_SIZE(rfgain_5111);
                break;
        case AR5K_RF5112:
                ath5k_rfg = rfgain_5112;
                size = ARRAY_SIZE(rfgain_5112);
                break;
        case AR5K_RF2413:
                ath5k_rfg = rfgain_2413;
                size = ARRAY_SIZE(rfgain_2413);
                break;
        case AR5K_RF2316:
                ath5k_rfg = rfgain_2316;
                size = ARRAY_SIZE(rfgain_2316);
                break;
        case AR5K_RF5413:
                ath5k_rfg = rfgain_5413;
                size = ARRAY_SIZE(rfgain_5413);
                break;
        case AR5K_RF2317:
        case AR5K_RF2425:
                ath5k_rfg = rfgain_2425;
                size = ARRAY_SIZE(rfgain_2425);
                break;
        default:
                return -EINVAL;
        }

        switch (freq) {
        case AR5K_INI_RFGAIN_2GHZ:
        case AR5K_INI_RFGAIN_5GHZ:
                break;
        default:
                return -EINVAL;
        }

        for (i = 0; i < size; i++) {
                AR5K_REG_WAIT(i);
                ath5k_hw_reg_write(ah, ath5k_rfg[i].rfg_value[freq],
                        (u32)ath5k_rfg[i].rfg_register);
        }

        return 0;
}



/********************\
* RF Registers setup *
\********************/


/*
 * Setup RF registers by writing rf buffer on hw
 */
int ath5k_hw_rfregs_init(struct ath5k_hw *ah, struct net80211_channel *channel,
                unsigned int mode)
{
        const struct ath5k_rf_reg *rf_regs;
        const struct ath5k_ini_rfbuffer *ini_rfb;
        const struct ath5k_gain_opt *go = NULL;
        const struct ath5k_gain_opt_step *g_step;
        struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
        u8 ee_mode = 0;
        u32 *rfb;
        int obdb = -1, bank = -1;
        unsigned i;

        switch (ah->ah_radio) {
        case AR5K_RF5111:
                rf_regs = rf_regs_5111;
                ah->ah_rf_regs_count = ARRAY_SIZE(rf_regs_5111);
                ini_rfb = rfb_5111;
                ah->ah_rf_banks_size = ARRAY_SIZE(rfb_5111);
                go = &rfgain_opt_5111;
                break;
        case AR5K_RF5112:
                if (ah->ah_radio_5ghz_revision >= AR5K_SREV_RAD_5112A) {
                        rf_regs = rf_regs_5112a;
                        ah->ah_rf_regs_count = ARRAY_SIZE(rf_regs_5112a);
                        ini_rfb = rfb_5112a;
                        ah->ah_rf_banks_size = ARRAY_SIZE(rfb_5112a);
                } else {
                        rf_regs = rf_regs_5112;
                        ah->ah_rf_regs_count = ARRAY_SIZE(rf_regs_5112);
                        ini_rfb = rfb_5112;
                        ah->ah_rf_banks_size = ARRAY_SIZE(rfb_5112);
                }
                go = &rfgain_opt_5112;
                break;
        case AR5K_RF2413:
                rf_regs = rf_regs_2413;
                ah->ah_rf_regs_count = ARRAY_SIZE(rf_regs_2413);
                ini_rfb = rfb_2413;
                ah->ah_rf_banks_size = ARRAY_SIZE(rfb_2413);
                break;
        case AR5K_RF2316:
                rf_regs = rf_regs_2316;
                ah->ah_rf_regs_count = ARRAY_SIZE(rf_regs_2316);
                ini_rfb = rfb_2316;
                ah->ah_rf_banks_size = ARRAY_SIZE(rfb_2316);
                break;
        case AR5K_RF5413:
                rf_regs = rf_regs_5413;
                ah->ah_rf_regs_count = ARRAY_SIZE(rf_regs_5413);
                ini_rfb = rfb_5413;
                ah->ah_rf_banks_size = ARRAY_SIZE(rfb_5413);
                break;
        case AR5K_RF2317:
                rf_regs = rf_regs_2425;
                ah->ah_rf_regs_count = ARRAY_SIZE(rf_regs_2425);
                ini_rfb = rfb_2317;
                ah->ah_rf_banks_size = ARRAY_SIZE(rfb_2317);
                break;
        case AR5K_RF2425:
                rf_regs = rf_regs_2425;
                ah->ah_rf_regs_count = ARRAY_SIZE(rf_regs_2425);
                if (ah->ah_mac_srev < AR5K_SREV_AR2417) {
                        ini_rfb = rfb_2425;
                        ah->ah_rf_banks_size = ARRAY_SIZE(rfb_2425);
                } else {
                        ini_rfb = rfb_2417;
                        ah->ah_rf_banks_size = ARRAY_SIZE(rfb_2417);
                }
                break;
        default:
                return -EINVAL;
        }

        /* If it's the first time we set rf buffer, allocate
         * ah->ah_rf_banks based on ah->ah_rf_banks_size
         * we set above */
        if (ah->ah_rf_banks == NULL) {
                ah->ah_rf_banks = malloc(sizeof(u32) * ah->ah_rf_banks_size);
                if (ah->ah_rf_banks == NULL) {
                        return -ENOMEM;
                }
        }

        /* Copy values to modify them */
        rfb = ah->ah_rf_banks;

        for (i = 0; i < ah->ah_rf_banks_size; i++) {
                if (ini_rfb[i].rfb_bank >= AR5K_MAX_RF_BANKS) {
                        DBG("ath5k: invalid RF register bank\n");
                        return -EINVAL;
                }

                /* Bank changed, write down the offset */
                if (bank != ini_rfb[i].rfb_bank) {
                        bank = ini_rfb[i].rfb_bank;
                        ah->ah_offset[bank] = i;
                }

                rfb[i] = ini_rfb[i].rfb_mode_data[mode];
        }

        /* Set Output and Driver bias current (OB/DB) */
        if (channel->hw_value & CHANNEL_2GHZ) {

                if (channel->hw_value & CHANNEL_CCK)
                        ee_mode = AR5K_EEPROM_MODE_11B;
                else
                        ee_mode = AR5K_EEPROM_MODE_11G;

                /* For RF511X/RF211X combination we
                 * use b_OB and b_DB parameters stored
                 * in eeprom on ee->ee_ob[ee_mode][0]
                 *
                 * For all other chips we use OB/DB for 2Ghz
                 * stored in the b/g modal section just like
                 * 802.11a on ee->ee_ob[ee_mode][1] */
                if ((ah->ah_radio == AR5K_RF5111) ||
                (ah->ah_radio == AR5K_RF5112))
                        obdb = 0;
                else
                        obdb = 1;

                ath5k_hw_rfb_op(ah, rf_regs, ee->ee_ob[ee_mode][obdb],
                                                AR5K_RF_OB_2GHZ, 1);

                ath5k_hw_rfb_op(ah, rf_regs, ee->ee_db[ee_mode][obdb],
                                                AR5K_RF_DB_2GHZ, 1);

        /* RF5111 always needs OB/DB for 5GHz, even if we use 2GHz */
        } else if ((channel->hw_value & CHANNEL_5GHZ) ||
                        (ah->ah_radio == AR5K_RF5111)) {

                /* For 11a, Turbo and XR we need to choose
                 * OB/DB based on frequency range */
                ee_mode = AR5K_EEPROM_MODE_11A;
                obdb =   channel->center_freq >= 5725 ? 3 :
                        (channel->center_freq >= 5500 ? 2 :
                        (channel->center_freq >= 5260 ? 1 :
                         (channel->center_freq > 4000 ? 0 : -1)));

                if (obdb < 0)
                        return -EINVAL;

                ath5k_hw_rfb_op(ah, rf_regs, ee->ee_ob[ee_mode][obdb],
                                                AR5K_RF_OB_5GHZ, 1);

                ath5k_hw_rfb_op(ah, rf_regs, ee->ee_db[ee_mode][obdb],
                                                AR5K_RF_DB_5GHZ, 1);
        }

        g_step = &go->go_step[ah->ah_gain.g_step_idx];

        /* Bank Modifications (chip-specific) */
        if (ah->ah_radio == AR5K_RF5111) {

                /* Set gain_F settings according to current step */
                if (channel->hw_value & CHANNEL_OFDM) {

                        AR5K_REG_WRITE_BITS(ah, AR5K_PHY_FRAME_CTL,
                                        AR5K_PHY_FRAME_CTL_TX_CLIP,
                                        g_step->gos_param[0]);

                        ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[1],
                                                        AR5K_RF_PWD_90, 1);

                        ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[2],
                                                        AR5K_RF_PWD_84, 1);

                        ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[3],
                                                AR5K_RF_RFGAIN_SEL, 1);

                        /* We programmed gain_F parameters, switch back
                         * to active state */
                        ah->ah_gain.g_state = AR5K_RFGAIN_ACTIVE;

                }

                /* Bank 6/7 setup */

                ath5k_hw_rfb_op(ah, rf_regs, !ee->ee_xpd[ee_mode],
                                                AR5K_RF_PWD_XPD, 1);

                ath5k_hw_rfb_op(ah, rf_regs, ee->ee_x_gain[ee_mode],
                                                AR5K_RF_XPD_GAIN, 1);

                ath5k_hw_rfb_op(ah, rf_regs, ee->ee_i_gain[ee_mode],
                                                AR5K_RF_GAIN_I, 1);

                ath5k_hw_rfb_op(ah, rf_regs, ee->ee_xpd[ee_mode],
                                                AR5K_RF_PLO_SEL, 1);

                /* TODO: Half/quarter channel support */
        }

        if (ah->ah_radio == AR5K_RF5112) {

                /* Set gain_F settings according to current step */
                if (channel->hw_value & CHANNEL_OFDM) {

                        ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[0],
                                                AR5K_RF_MIXGAIN_OVR, 1);

                        ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[1],
                                                AR5K_RF_PWD_138, 1);

                        ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[2],
                                                AR5K_RF_PWD_137, 1);

                        ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[3],
                                                AR5K_RF_PWD_136, 1);

                        ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[4],
                                                AR5K_RF_PWD_132, 1);

                        ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[5],
                                                AR5K_RF_PWD_131, 1);

                        ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[6],
                                                AR5K_RF_PWD_130, 1);

                        /* We programmed gain_F parameters, switch back
                         * to active state */
                        ah->ah_gain.g_state = AR5K_RFGAIN_ACTIVE;
                }

                /* Bank 6/7 setup */

                ath5k_hw_rfb_op(ah, rf_regs, ee->ee_xpd[ee_mode],
                                                AR5K_RF_XPD_SEL, 1);

                if (ah->ah_radio_5ghz_revision < AR5K_SREV_RAD_5112A) {
                        /* Rev. 1 supports only one xpd */
                        ath5k_hw_rfb_op(ah, rf_regs,
                                                ee->ee_x_gain[ee_mode],
                                                AR5K_RF_XPD_GAIN, 1);

                } else {
                        /* TODO: Set high and low gain bits */
                        ath5k_hw_rfb_op(ah, rf_regs,
                                                ee->ee_x_gain[ee_mode],
                                                AR5K_RF_PD_GAIN_LO, 1);
                        ath5k_hw_rfb_op(ah, rf_regs,
                                                ee->ee_x_gain[ee_mode],
                                                AR5K_RF_PD_GAIN_HI, 1);

                        /* Lower synth voltage on Rev 2 */
                        ath5k_hw_rfb_op(ah, rf_regs, 2,
                                        AR5K_RF_HIGH_VC_CP, 1);

                        ath5k_hw_rfb_op(ah, rf_regs, 2,
                                        AR5K_RF_MID_VC_CP, 1);

                        ath5k_hw_rfb_op(ah, rf_regs, 2,
                                        AR5K_RF_LOW_VC_CP, 1);

                        ath5k_hw_rfb_op(ah, rf_regs, 2,
                                        AR5K_RF_PUSH_UP, 1);

                        /* Decrease power consumption on 5213+ BaseBand */
                        if (ah->ah_phy_revision >= AR5K_SREV_PHY_5212A) {
                                ath5k_hw_rfb_op(ah, rf_regs, 1,
                                                AR5K_RF_PAD2GND, 1);

                                ath5k_hw_rfb_op(ah, rf_regs, 1,
                                                AR5K_RF_XB2_LVL, 1);

                                ath5k_hw_rfb_op(ah, rf_regs, 1,
                                                AR5K_RF_XB5_LVL, 1);

                                ath5k_hw_rfb_op(ah, rf_regs, 1,
                                                AR5K_RF_PWD_167, 1);

                                ath5k_hw_rfb_op(ah, rf_regs, 1,
                                                AR5K_RF_PWD_166, 1);
                        }
                }

                ath5k_hw_rfb_op(ah, rf_regs, ee->ee_i_gain[ee_mode],
                                                AR5K_RF_GAIN_I, 1);

                /* TODO: Half/quarter channel support */

        }

        if (ah->ah_radio == AR5K_RF5413 &&
        channel->hw_value & CHANNEL_2GHZ) {

                ath5k_hw_rfb_op(ah, rf_regs, 1, AR5K_RF_DERBY_CHAN_SEL_MODE,
                                                                        1);

                /* Set optimum value for early revisions (on pci-e chips) */
                if (ah->ah_mac_srev >= AR5K_SREV_AR5424 &&
                ah->ah_mac_srev < AR5K_SREV_AR5413)
                        ath5k_hw_rfb_op(ah, rf_regs, ath5k_hw_bitswap(6, 3),
                                                AR5K_RF_PWD_ICLOBUF_2G, 1);

        }

        /* Write RF banks on hw */
        for (i = 0; i < ah->ah_rf_banks_size; i++) {
                AR5K_REG_WAIT(i);
                ath5k_hw_reg_write(ah, rfb[i], ini_rfb[i].rfb_ctrl_register);
        }

        return 0;
}


/**************************\
  PHY/RF channel functions
\**************************/

/*
 * Check if a channel is supported
 */
int ath5k_channel_ok(struct ath5k_hw *ah, u16 freq, unsigned int flags)
{
        /* Check if the channel is in our supported range */
        if (flags & CHANNEL_2GHZ) {
                if ((freq >= ah->ah_capabilities.cap_range.range_2ghz_min) &&
                    (freq <= ah->ah_capabilities.cap_range.range_2ghz_max))
                        return 1;
        } else if (flags & CHANNEL_5GHZ)
                if ((freq >= ah->ah_capabilities.cap_range.range_5ghz_min) &&
                    (freq <= ah->ah_capabilities.cap_range.range_5ghz_max))
                        return 1;

        return 0;
}

/*
 * Convertion needed for RF5110
 */
static u32 ath5k_hw_rf5110_chan2athchan(struct net80211_channel *channel)
{
        u32 athchan;

        /*
         * Convert IEEE channel/MHz to an internal channel value used
         * by the AR5210 chipset. This has not been verified with
         * newer chipsets like the AR5212A who have a completely
         * different RF/PHY part.
         */
        athchan = (ath5k_hw_bitswap((ath5k_freq_to_channel(channel->center_freq)
                                     - 24) / 2, 5) << 1)
                | (1 << 6) | 0x1;
        return athchan;
}

/*
 * Set channel on RF5110
 */
static int ath5k_hw_rf5110_channel(struct ath5k_hw *ah,
                struct net80211_channel *channel)
{
        u32 data;

        /*
         * Set the channel and wait
         */
        data = ath5k_hw_rf5110_chan2athchan(channel);
        ath5k_hw_reg_write(ah, data, AR5K_RF_BUFFER);
        ath5k_hw_reg_write(ah, 0, AR5K_RF_BUFFER_CONTROL_0);
        mdelay(1);

        return 0;
}

/*
 * Convertion needed for 5111
 */
static int ath5k_hw_rf5111_chan2athchan(unsigned int ieee,
                struct ath5k_athchan_2ghz *athchan)
{
        int channel;

        /* Cast this value to catch negative channel numbers (>= -19) */
        channel = (int)ieee;

        /*
         * Map 2GHz IEEE channel to 5GHz Atheros channel
         */
        if (channel <= 13) {
                athchan->a2_athchan = 115 + channel;
                athchan->a2_flags = 0x46;
        } else if (channel == 14) {
                athchan->a2_athchan = 124;
                athchan->a2_flags = 0x44;
        } else if (channel >= 15 && channel <= 26) {
                athchan->a2_athchan = ((channel - 14) * 4) + 132;
                athchan->a2_flags = 0x46;
        } else
                return -EINVAL;

        return 0;
}

/*
 * Set channel on 5111
 */
static int ath5k_hw_rf5111_channel(struct ath5k_hw *ah,
                struct net80211_channel *channel)
{
        struct ath5k_athchan_2ghz ath5k_channel_2ghz;
        unsigned int ath5k_channel = ath5k_freq_to_channel(channel->center_freq);
        u32 data0, data1, clock;
        int ret;

        /*
         * Set the channel on the RF5111 radio
         */
        data0 = data1 = 0;

        if (channel->hw_value & CHANNEL_2GHZ) {
                /* Map 2GHz channel to 5GHz Atheros channel ID */
                ret = ath5k_hw_rf5111_chan2athchan(ath5k_channel,
                                                   &ath5k_channel_2ghz);
                if (ret)
                        return ret;

                ath5k_channel = ath5k_channel_2ghz.a2_athchan;
                data0 = ((ath5k_hw_bitswap(ath5k_channel_2ghz.a2_flags, 8) & 0xff)
                    << 5) | (1 << 4);
        }

        if (ath5k_channel < 145 || !(ath5k_channel & 1)) {
                clock = 1;
                data1 = ((ath5k_hw_bitswap(ath5k_channel - 24, 8) & 0xff) << 2) |
                        (clock << 1) | (1 << 10) | 1;
        } else {
                clock = 0;
                data1 = ((ath5k_hw_bitswap((ath5k_channel - 24) / 2, 8) & 0xff)
                        << 2) | (clock << 1) | (1 << 10) | 1;
        }

        ath5k_hw_reg_write(ah, (data1 & 0xff) | ((data0 & 0xff) << 8),
                        AR5K_RF_BUFFER);
        ath5k_hw_reg_write(ah, ((data1 >> 8) & 0xff) | (data0 & 0xff00),
                        AR5K_RF_BUFFER_CONTROL_3);

        return 0;
}

/*
 * Set channel on 5112 and newer
 */
static int ath5k_hw_rf5112_channel(struct ath5k_hw *ah,
                struct net80211_channel *channel)
{
        u32 data, data0, data1, data2;
        u16 c;

        data = data0 = data1 = data2 = 0;
        c = channel->center_freq;

        if (c < 4800) {
                if (!((c - 2224) % 5)) {
                        data0 = ((2 * (c - 704)) - 3040) / 10;
                        data1 = 1;
                } else if (!((c - 2192) % 5)) {
                        data0 = ((2 * (c - 672)) - 3040) / 10;
                        data1 = 0;
                } else
                        return -EINVAL;

                data0 = ath5k_hw_bitswap((data0 << 2) & 0xff, 8);
        } else if ((c - (c % 5)) != 2 || c > 5435) {
                if (!(c % 20) && c >= 5120) {
                        data0 = ath5k_hw_bitswap(((c - 4800) / 20 << 2), 8);
                        data2 = ath5k_hw_bitswap(3, 2);
                } else if (!(c % 10)) {
                        data0 = ath5k_hw_bitswap(((c - 4800) / 10 << 1), 8);
                        data2 = ath5k_hw_bitswap(2, 2);
                } else if (!(c % 5)) {
                        data0 = ath5k_hw_bitswap((c - 4800) / 5, 8);
                        data2 = ath5k_hw_bitswap(1, 2);
                } else
                        return -EINVAL;
        } else {
                data0 = ath5k_hw_bitswap((10 * (c - 2) - 4800) / 25 + 1, 8);
                data2 = ath5k_hw_bitswap(0, 2);
        }

        data = (data0 << 4) | (data1 << 1) | (data2 << 2) | 0x1001;

        ath5k_hw_reg_write(ah, data & 0xff, AR5K_RF_BUFFER);
        ath5k_hw_reg_write(ah, (data >> 8) & 0x7f, AR5K_RF_BUFFER_CONTROL_5);

        return 0;
}

/*
 * Set the channel on the RF2425
 */
static int ath5k_hw_rf2425_channel(struct ath5k_hw *ah,
                struct net80211_channel *channel)
{
        u32 data, data0, data2;
        u16 c;

        data = data0 = data2 = 0;
        c = channel->center_freq;

        if (c < 4800) {
                data0 = ath5k_hw_bitswap((c - 2272), 8);
                data2 = 0;
        /* ? 5GHz ? */
        } else if ((c - (c % 5)) != 2 || c > 5435) {
                if (!(c % 20) && c < 5120)
                        data0 = ath5k_hw_bitswap(((c - 4800) / 20 << 2), 8);
                else if (!(c % 10))
                        data0 = ath5k_hw_bitswap(((c - 4800) / 10 << 1), 8);
                else if (!(c % 5))
                        data0 = ath5k_hw_bitswap((c - 4800) / 5, 8);
                else
                        return -EINVAL;
                data2 = ath5k_hw_bitswap(1, 2);
        } else {
                data0 = ath5k_hw_bitswap((10 * (c - 2) - 4800) / 25 + 1, 8);
                data2 = ath5k_hw_bitswap(0, 2);
        }

        data = (data0 << 4) | data2 << 2 | 0x1001;

        ath5k_hw_reg_write(ah, data & 0xff, AR5K_RF_BUFFER);
        ath5k_hw_reg_write(ah, (data >> 8) & 0x7f, AR5K_RF_BUFFER_CONTROL_5);

        return 0;
}

/*
 * Set a channel on the radio chip
 */
int ath5k_hw_channel(struct ath5k_hw *ah, struct net80211_channel *channel)
{
        int ret;
        /*
         * Check bounds supported by the PHY (we don't care about regultory
         * restrictions at this point). Note: hw_value already has the band
         * (CHANNEL_2GHZ, or CHANNEL_5GHZ) so we inform ath5k_channel_ok()
         * of the band by that */
        if (!ath5k_channel_ok(ah, channel->center_freq, channel->hw_value)) {
                DBG("ath5k: channel frequency (%d MHz) out of supported "
                    "range\n", channel->center_freq);
                return -EINVAL;
        }

        /*
         * Set the channel and wait
         */
        switch (ah->ah_radio) {
        case AR5K_RF5110:
                ret = ath5k_hw_rf5110_channel(ah, channel);
                break;
        case AR5K_RF5111:
                ret = ath5k_hw_rf5111_channel(ah, channel);
                break;
        case AR5K_RF2425:
                ret = ath5k_hw_rf2425_channel(ah, channel);
                break;
        default:
                ret = ath5k_hw_rf5112_channel(ah, channel);
                break;
        }

        if (ret) {
                DBG("ath5k: setting channel failed: %s\n", strerror(ret));
                return ret;
        }

        /* Set JAPAN setting for channel 14 */
        if (channel->center_freq == 2484) {
                AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_CCKTXCTL,
                                AR5K_PHY_CCKTXCTL_JAPAN);
        } else {
                AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_CCKTXCTL,
                                AR5K_PHY_CCKTXCTL_WORLD);
        }

        ah->ah_current_channel = channel;
        ah->ah_turbo = (channel->hw_value == CHANNEL_T ? 1 : 0);

        return 0;
}

/*****************\
  PHY calibration
\*****************/

/**
 * ath5k_hw_noise_floor_calibration - perform PHY noise floor calibration
 *
 * @ah: struct ath5k_hw pointer we are operating on
 * @freq: the channel frequency, just used for error logging
 *
 * This function performs a noise floor calibration of the PHY and waits for
 * it to complete. Then the noise floor value is compared to some maximum
 * noise floor we consider valid.
 *
 * Note that this is different from what the madwifi HAL does: it reads the
 * noise floor and afterwards initiates the calibration. Since the noise floor
 * calibration can take some time to finish, depending on the current channel
 * use, that avoids the occasional timeout warnings we are seeing now.
 *
 * See the following link for an Atheros patent on noise floor calibration:
 * http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL \
 * &p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=7245893.PN.&OS=PN/7
 *
 * XXX: Since during noise floor calibration antennas are detached according to
 * the patent, we should stop tx queues here.
 */
int
ath5k_hw_noise_floor_calibration(struct ath5k_hw *ah, short freq)
{
        int ret;
        unsigned int i;
        s32 noise_floor;

        /*
         * Enable noise floor calibration
         */
        AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_AGCCTL,
                                AR5K_PHY_AGCCTL_NF);

        ret = ath5k_hw_register_timeout(ah, AR5K_PHY_AGCCTL,
                        AR5K_PHY_AGCCTL_NF, 0, 0);

        if (ret) {
                DBG("ath5k: noise floor calibration timeout (%d MHz)\n", freq);
                return -EAGAIN;
        }

        /* Wait until the noise floor is calibrated and read the value */
        for (i = 20; i > 0; i--) {
                mdelay(1);
                noise_floor = ath5k_hw_reg_read(ah, AR5K_PHY_NF);
                noise_floor = AR5K_PHY_NF_RVAL(noise_floor);
                if (noise_floor & AR5K_PHY_NF_ACTIVE) {
                        noise_floor = AR5K_PHY_NF_AVAL(noise_floor);

                        if (noise_floor <= AR5K_TUNE_NOISE_FLOOR)
                                break;
                }
        }

        DBG2("ath5k: noise floor %d\n", noise_floor);

        if (noise_floor > AR5K_TUNE_NOISE_FLOOR) {
                DBG("ath5k: noise floor calibration failed (%d MHz)\n", freq);
                return -EAGAIN;
        }

        ah->ah_noise_floor = noise_floor;

        return 0;
}

/*
 * Perform a PHY calibration on RF5110
 * -Fix BPSK/QAM Constellation (I/Q correction)
 * -Calculate Noise Floor
 */
static int ath5k_hw_rf5110_calibrate(struct ath5k_hw *ah,
                struct net80211_channel *channel)
{
        u32 phy_sig, phy_agc, phy_sat, beacon;
        int ret;

        /*
         * Disable beacons and RX/TX queues, wait
         */
        AR5K_REG_ENABLE_BITS(ah, AR5K_DIAG_SW_5210,
                AR5K_DIAG_SW_DIS_TX | AR5K_DIAG_SW_DIS_RX_5210);
        beacon = ath5k_hw_reg_read(ah, AR5K_BEACON_5210);
        ath5k_hw_reg_write(ah, beacon & ~AR5K_BEACON_ENABLE, AR5K_BEACON_5210);

        mdelay(2);

        /*
         * Set the channel (with AGC turned off)
         */
        AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_AGC, AR5K_PHY_AGC_DISABLE);
        udelay(10);
        ret = ath5k_hw_channel(ah, channel);

        /*
         * Activate PHY and wait
         */
        ath5k_hw_reg_write(ah, AR5K_PHY_ACT_ENABLE, AR5K_PHY_ACT);
        mdelay(1);

        AR5K_REG_DISABLE_BITS(ah, AR5K_PHY_AGC, AR5K_PHY_AGC_DISABLE);

        if (ret)
                return ret;

        /*
         * Calibrate the radio chip
         */

        /* Remember normal state */
        phy_sig = ath5k_hw_reg_read(ah, AR5K_PHY_SIG);
        phy_agc = ath5k_hw_reg_read(ah, AR5K_PHY_AGCCOARSE);
        phy_sat = ath5k_hw_reg_read(ah, AR5K_PHY_ADCSAT);

        /* Update radio registers */
        ath5k_hw_reg_write(ah, (phy_sig & ~(AR5K_PHY_SIG_FIRPWR)) |
                AR5K_REG_SM(-1, AR5K_PHY_SIG_FIRPWR), AR5K_PHY_SIG);

        ath5k_hw_reg_write(ah, (phy_agc & ~(AR5K_PHY_AGCCOARSE_HI |
                        AR5K_PHY_AGCCOARSE_LO)) |
                AR5K_REG_SM(-1, AR5K_PHY_AGCCOARSE_HI) |
                AR5K_REG_SM(-127, AR5K_PHY_AGCCOARSE_LO), AR5K_PHY_AGCCOARSE);

        ath5k_hw_reg_write(ah, (phy_sat & ~(AR5K_PHY_ADCSAT_ICNT |
                        AR5K_PHY_ADCSAT_THR)) |
                AR5K_REG_SM(2, AR5K_PHY_ADCSAT_ICNT) |
                AR5K_REG_SM(12, AR5K_PHY_ADCSAT_THR), AR5K_PHY_ADCSAT);

        udelay(20);

        AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_AGC, AR5K_PHY_AGC_DISABLE);
        udelay(10);
        ath5k_hw_reg_write(ah, AR5K_PHY_RFSTG_DISABLE, AR5K_PHY_RFSTG);
        AR5K_REG_DISABLE_BITS(ah, AR5K_PHY_AGC, AR5K_PHY_AGC_DISABLE);

        mdelay(1);

        /*
         * Enable calibration and wait until completion
         */
        AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_AGCCTL, AR5K_PHY_AGCCTL_CAL);

        ret = ath5k_hw_register_timeout(ah, AR5K_PHY_AGCCTL,
                        AR5K_PHY_AGCCTL_CAL, 0, 0);

        /* Reset to normal state */
        ath5k_hw_reg_write(ah, phy_sig, AR5K_PHY_SIG);
        ath5k_hw_reg_write(ah, phy_agc, AR5K_PHY_AGCCOARSE);
        ath5k_hw_reg_write(ah, phy_sat, AR5K_PHY_ADCSAT);

        if (ret) {
                DBG("ath5k: calibration timeout (%d MHz)\n",
                    channel->center_freq);
                return ret;
        }

        ath5k_hw_noise_floor_calibration(ah, channel->center_freq);

        /*
         * Re-enable RX/TX and beacons
         */
        AR5K_REG_DISABLE_BITS(ah, AR5K_DIAG_SW_5210,
                AR5K_DIAG_SW_DIS_TX | AR5K_DIAG_SW_DIS_RX_5210);
        ath5k_hw_reg_write(ah, beacon, AR5K_BEACON_5210);

        return 0;
}

/*
 * Perform a PHY calibration on RF5111/5112 and newer chips
 */
static int ath5k_hw_rf511x_calibrate(struct ath5k_hw *ah,
                struct net80211_channel *channel)
{
        u32 i_pwr, q_pwr;
        s32 iq_corr, i_coff, i_coffd, q_coff, q_coffd;
        int i;

        if (!ah->ah_calibration ||
                ath5k_hw_reg_read(ah, AR5K_PHY_IQ) & AR5K_PHY_IQ_RUN)
                goto done;

        /* Calibration has finished, get the results and re-run */
        for (i = 0; i <= 10; i++) {
                iq_corr = ath5k_hw_reg_read(ah, AR5K_PHY_IQRES_CAL_CORR);
                i_pwr = ath5k_hw_reg_read(ah, AR5K_PHY_IQRES_CAL_PWR_I);
                q_pwr = ath5k_hw_reg_read(ah, AR5K_PHY_IQRES_CAL_PWR_Q);
        }

        i_coffd = ((i_pwr >> 1) + (q_pwr >> 1)) >> 7;
        q_coffd = q_pwr >> 7;

        /* No correction */
        if (i_coffd == 0 || q_coffd == 0)
                goto done;

        i_coff = ((-iq_corr) / i_coffd) & 0x3f;

        /* Boundary check */
        if (i_coff > 31)
                i_coff = 31;
        if (i_coff < -32)
                i_coff = -32;

        q_coff = (((s32)i_pwr / q_coffd) - 128) & 0x1f;

        /* Boundary check */
        if (q_coff > 15)
                q_coff = 15;
        if (q_coff < -16)
                q_coff = -16;

        /* Commit new I/Q value */
        AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_IQ, AR5K_PHY_IQ_CORR_ENABLE |
                ((u32)q_coff) | ((u32)i_coff << AR5K_PHY_IQ_CORR_Q_I_COFF_S));

        /* Re-enable calibration -if we don't we'll commit
         * the same values again and again */
        AR5K_REG_WRITE_BITS(ah, AR5K_PHY_IQ,
                        AR5K_PHY_IQ_CAL_NUM_LOG_MAX, 15);
        AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_IQ, AR5K_PHY_IQ_RUN);

done:

        /* TODO: Separate noise floor calibration from I/Q calibration
         * since noise floor calibration interrupts rx path while I/Q
         * calibration doesn't. We don't need to run noise floor calibration
         * as often as I/Q calibration.*/
        ath5k_hw_noise_floor_calibration(ah, channel->center_freq);

        /* Initiate a gain_F calibration */
        ath5k_hw_request_rfgain_probe(ah);

        return 0;
}

/*
 * Perform a PHY calibration
 */
int ath5k_hw_phy_calibrate(struct ath5k_hw *ah,
                struct net80211_channel *channel)
{
        int ret;

        if (ah->ah_radio == AR5K_RF5110)
                ret = ath5k_hw_rf5110_calibrate(ah, channel);
        else
                ret = ath5k_hw_rf511x_calibrate(ah, channel);

        return ret;
}

int ath5k_hw_phy_disable(struct ath5k_hw *ah)
{
        ath5k_hw_reg_write(ah, AR5K_PHY_ACT_DISABLE, AR5K_PHY_ACT);

        return 0;
}

/********************\
  Misc PHY functions
\********************/

/*
 * Get the PHY Chip revision
 */
u16 ath5k_hw_radio_revision(struct ath5k_hw *ah, unsigned int chan)
{
        unsigned int i;
        u32 srev;
        u16 ret;

        /*
         * Set the radio chip access register
         */
        switch (chan) {
        case CHANNEL_2GHZ:
                ath5k_hw_reg_write(ah, AR5K_PHY_SHIFT_2GHZ, AR5K_PHY(0));
                break;
        case CHANNEL_5GHZ:
                ath5k_hw_reg_write(ah, AR5K_PHY_SHIFT_5GHZ, AR5K_PHY(0));
                break;
        default:
                return 0;
        }

        mdelay(2);

        /* ...wait until PHY is ready and read the selected radio revision */
        ath5k_hw_reg_write(ah, 0x00001c16, AR5K_PHY(0x34));

        for (i = 0; i < 8; i++)
                ath5k_hw_reg_write(ah, 0x00010000, AR5K_PHY(0x20));

        if (ah->ah_version == AR5K_AR5210) {
                srev = ath5k_hw_reg_read(ah, AR5K_PHY(256) >> 28) & 0xf;
                ret = (u16)ath5k_hw_bitswap(srev, 4) + 1;
        } else {
                srev = (ath5k_hw_reg_read(ah, AR5K_PHY(0x100)) >> 24) & 0xff;
                ret = (u16)ath5k_hw_bitswap(((srev & 0xf0) >> 4) |
                                ((srev & 0x0f) << 4), 8);
        }

        /* Reset to the 5GHz mode */
        ath5k_hw_reg_write(ah, AR5K_PHY_SHIFT_5GHZ, AR5K_PHY(0));

        return ret;
}

void /*TODO:Boundary check*/
ath5k_hw_set_def_antenna(struct ath5k_hw *ah, unsigned int ant)
{
        if (ah->ah_version != AR5K_AR5210)
                ath5k_hw_reg_write(ah, ant, AR5K_DEFAULT_ANTENNA);
}

unsigned int ath5k_hw_get_def_antenna(struct ath5k_hw *ah)
{
        if (ah->ah_version != AR5K_AR5210)
                return ath5k_hw_reg_read(ah, AR5K_DEFAULT_ANTENNA);

        return 0; /*XXX: What do we return for 5210 ?*/
}


/****************\
* TX power setup *
\****************/

/*
 * Helper functions
 */

/*
 * Do linear interpolation between two given (x, y) points
 */
static s16
ath5k_get_interpolated_value(s16 target, s16 x_left, s16 x_right,
                                        s16 y_left, s16 y_right)
{
        s16 ratio, result;

        /* Avoid divide by zero and skip interpolation
         * if we have the same point */
        if ((x_left == x_right) || (y_left == y_right))
                return y_left;

        /*
         * Since we use ints and not fps, we need to scale up in
         * order to get a sane ratio value (or else we 'll eg. get
         * always 1 instead of 1.25, 1.75 etc). We scale up by 100
         * to have some accuracy both for 0.5 and 0.25 steps.
         */
        ratio = ((100 * y_right - 100 * y_left)/(x_right - x_left));

        /* Now scale down to be in range */
        result = y_left + (ratio * (target - x_left) / 100);

        return result;
}

/*
 * Find vertical boundary (min pwr) for the linear PCDAC curve.
 *
 * Since we have the top of the curve and we draw the line below
 * until we reach 1 (1 pcdac step) we need to know which point
 * (x value) that is so that we don't go below y axis and have negative
 * pcdac values when creating the curve, or fill the table with zeroes.
 */
static s16
ath5k_get_linear_pcdac_min(const u8 *stepL, const u8 *stepR,
                                const s16 *pwrL, const s16 *pwrR)
{
        s8 tmp;
        s16 min_pwrL, min_pwrR;
        s16 pwr_i;

        if (pwrL[0] == pwrL[1])
                min_pwrL = pwrL[0];
        else {
                pwr_i = pwrL[0];
                do {
                        pwr_i--;
                        tmp = (s8) ath5k_get_interpolated_value(pwr_i,
                                                        pwrL[0], pwrL[1],
                                                        stepL[0], stepL[1]);
                } while (tmp > 1);

                min_pwrL = pwr_i;
        }

        if (pwrR[0] == pwrR[1])
                min_pwrR = pwrR[0];
        else {
                pwr_i = pwrR[0];
                do {
                        pwr_i--;
                        tmp = (s8) ath5k_get_interpolated_value(pwr_i,
                                                        pwrR[0], pwrR[1],
                                                        stepR[0], stepR[1]);
                } while (tmp > 1);

                min_pwrR = pwr_i;
        }

        /* Keep the right boundary so that it works for both curves */
        return max(min_pwrL, min_pwrR);
}

/*
 * Interpolate (pwr,vpd) points to create a Power to PDADC or a
 * Power to PCDAC curve.
 *
 * Each curve has power on x axis (in 0.5dB units) and PCDAC/PDADC
 * steps (offsets) on y axis. Power can go up to 31.5dB and max
 * PCDAC/PDADC step for each curve is 64 but we can write more than
 * one curves on hw so we can go up to 128 (which is the max step we
 * can write on the final table).
 *
 * We write y values (PCDAC/PDADC steps) on hw.
 */
static void
ath5k_create_power_curve(s16 pmin, s16 pmax,
                        const s16 *pwr, const u8 *vpd,
                        u8 num_points,
                        u8 *vpd_table, u8 type)
{
        u8 idx[2] = { 0, 1 };
        s16 pwr_i = 2*pmin;
        int i;

        if (num_points < 2)
                return;

        /* We want the whole line, so adjust boundaries
         * to cover the entire power range. Note that
         * power values are already 0.25dB so no need
         * to multiply pwr_i by 2 */
        if (type == AR5K_PWRTABLE_LINEAR_PCDAC) {
                pwr_i = pmin;
                pmin = 0;
                pmax = 63;
        }

        /* Find surrounding turning points (TPs)
         * and interpolate between them */
        for (i = 0; (i <= (u16) (pmax - pmin)) &&
        (i < AR5K_EEPROM_POWER_TABLE_SIZE); i++) {

                /* We passed the right TP, move to the next set of TPs
                 * if we pass the last TP, extrapolate above using the last
                 * two TPs for ratio */
                if ((pwr_i > pwr[idx[1]]) && (idx[1] < num_points - 1)) {
                        idx[0]++;
                        idx[1]++;
                }

                vpd_table[i] = (u8) ath5k_get_interpolated_value(pwr_i,
                                                pwr[idx[0]], pwr[idx[1]],
                                                vpd[idx[0]], vpd[idx[1]]);

                /* Increase by 0.5dB
                 * (0.25 dB units) */
                pwr_i += 2;
        }
}

/*
 * Get the surrounding per-channel power calibration piers
 * for a given frequency so that we can interpolate between
 * them and come up with an apropriate dataset for our current
 * channel.
 */
static void
ath5k_get_chan_pcal_surrounding_piers(struct ath5k_hw *ah,
                        struct net80211_channel *channel,
                        struct ath5k_chan_pcal_info **pcinfo_l,
                        struct ath5k_chan_pcal_info **pcinfo_r)
{
        struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
        struct ath5k_chan_pcal_info *pcinfo;
        u8 idx_l, idx_r;
        u8 mode, max, i;
        u32 target = channel->center_freq;

        idx_l = 0;
        idx_r = 0;

        if (!(channel->hw_value & CHANNEL_OFDM)) {
                pcinfo = ee->ee_pwr_cal_b;
                mode = AR5K_EEPROM_MODE_11B;
        } else if (channel->hw_value & CHANNEL_2GHZ) {
                pcinfo = ee->ee_pwr_cal_g;
                mode = AR5K_EEPROM_MODE_11G;
        } else {
                pcinfo = ee->ee_pwr_cal_a;
                mode = AR5K_EEPROM_MODE_11A;
        }
        max = ee->ee_n_piers[mode] - 1;

        /* Frequency is below our calibrated
         * range. Use the lowest power curve
         * we have */
        if (target < pcinfo[0].freq) {
                idx_l = idx_r = 0;
                goto done;
        }

        /* Frequency is above our calibrated
         * range. Use the highest power curve
         * we have */
        if (target > pcinfo[max].freq) {
                idx_l = idx_r = max;
                goto done;
        }

        /* Frequency is inside our calibrated
         * channel range. Pick the surrounding
         * calibration piers so that we can
         * interpolate */
        for (i = 0; i <= max; i++) {

                /* Frequency matches one of our calibration
                 * piers, no need to interpolate, just use
                 * that calibration pier */
                if (pcinfo[i].freq == target) {
                        idx_l = idx_r = i;
                        goto done;
                }

                /* We found a calibration pier that's above
                 * frequency, use this pier and the previous
                 * one to interpolate */
                if (target < pcinfo[i].freq) {
                        idx_r = i;
                        idx_l = idx_r - 1;
                        goto done;
                }
        }

done:
        *pcinfo_l = &pcinfo[idx_l];
        *pcinfo_r = &pcinfo[idx_r];

        return;
}

/*
 * Get the surrounding per-rate power calibration data
 * for a given frequency and interpolate between power
 * values to set max target power supported by hw for
 * each rate.
 */
static void
ath5k_get_rate_pcal_data(struct ath5k_hw *ah,
                        struct net80211_channel *channel,
                        struct ath5k_rate_pcal_info *rates)
{
        struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
        struct ath5k_rate_pcal_info *rpinfo;
        u8 idx_l, idx_r;
        u8 mode, max, i;
        u32 target = channel->center_freq;

        idx_l = 0;
        idx_r = 0;

        if (!(channel->hw_value & CHANNEL_OFDM)) {
                rpinfo = ee->ee_rate_tpwr_b;
                mode = AR5K_EEPROM_MODE_11B;
        } else if (channel->hw_value & CHANNEL_2GHZ) {
                rpinfo = ee->ee_rate_tpwr_g;
                mode = AR5K_EEPROM_MODE_11G;
        } else {
                rpinfo = ee->ee_rate_tpwr_a;
                mode = AR5K_EEPROM_MODE_11A;
        }
        max = ee->ee_rate_target_pwr_num[mode] - 1;

        /* Get the surrounding calibration
         * piers - same as above */
        if (target < rpinfo[0].freq) {
                idx_l = idx_r = 0;
                goto done;
        }

        if (target > rpinfo[max].freq) {
                idx_l = idx_r = max;
                goto done;
        }

        for (i = 0; i <= max; i++) {

                if (rpinfo[i].freq == target) {
                        idx_l = idx_r = i;
                        goto done;
                }

                if (target < rpinfo[i].freq) {
                        idx_r = i;
                        idx_l = idx_r - 1;
                        goto done;
                }
        }

done:
        /* Now interpolate power value, based on the frequency */
        rates->freq = target;

        rates->target_power_6to24 =
                ath5k_get_interpolated_value(target, rpinfo[idx_l].freq,
                                        rpinfo[idx_r].freq,
                                        rpinfo[idx_l].target_power_6to24,
                                        rpinfo[idx_r].target_power_6to24);

        rates->target_power_36 =
                ath5k_get_interpolated_value(target, rpinfo[idx_l].freq,
                                        rpinfo[idx_r].freq,
                                        rpinfo[idx_l].target_power_36,
                                        rpinfo[idx_r].target_power_36);

        rates->target_power_48 =
                ath5k_get_interpolated_value(target, rpinfo[idx_l].freq,
                                        rpinfo[idx_r].freq,
                                        rpinfo[idx_l].target_power_48,
                                        rpinfo[idx_r].target_power_48);

        rates->target_power_54 =
                ath5k_get_interpolated_value(target, rpinfo[idx_l].freq,
                                        rpinfo[idx_r].freq,
                                        rpinfo[idx_l].target_power_54,
                                        rpinfo[idx_r].target_power_54);
}

/*
 * Get the max edge power for this channel if
 * we have such data from EEPROM's Conformance Test
 * Limits (CTL), and limit max power if needed.
 *
 * FIXME: Only works for world regulatory domains
 */
static void
ath5k_get_max_ctl_power(struct ath5k_hw *ah,
                        struct net80211_channel *channel)
{
        struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
        struct ath5k_edge_power *rep = ee->ee_ctl_pwr;
        u8 *ctl_val = ee->ee_ctl;
        s16 max_chan_pwr = ah->ah_txpower.txp_max_pwr / 4;
        s16 edge_pwr = 0;
        u8 rep_idx;
        u8 i, ctl_mode;
        u8 ctl_idx = 0xFF;
        u32 target = channel->center_freq;

        /* Find out a CTL for our mode that's not mapped
         * on a specific reg domain.
         *
         * TODO: Map our current reg domain to one of the 3 available
         * reg domain ids so that we can support more CTLs. */
        switch (channel->hw_value & CHANNEL_MODES) {
        case CHANNEL_A:
                ctl_mode = AR5K_CTL_11A | AR5K_CTL_NO_REGDOMAIN;
                break;
        case CHANNEL_G:
                ctl_mode = AR5K_CTL_11G | AR5K_CTL_NO_REGDOMAIN;
                break;
        case CHANNEL_B:
                ctl_mode = AR5K_CTL_11B | AR5K_CTL_NO_REGDOMAIN;
                break;
        case CHANNEL_T:
                ctl_mode = AR5K_CTL_TURBO | AR5K_CTL_NO_REGDOMAIN;
                break;
        case CHANNEL_TG:
                ctl_mode = AR5K_CTL_TURBOG | AR5K_CTL_NO_REGDOMAIN;
                break;
        case CHANNEL_XR:
                /* Fall through */
        default:
                return;
        }

        for (i = 0; i < ee->ee_ctls; i++) {
                if (ctl_val[i] == ctl_mode) {
                        ctl_idx = i;
                        break;
                }
        }

        /* If we have a CTL dataset available grab it and find the
         * edge power for our frequency */
        if (ctl_idx == 0xFF)
                return;

        /* Edge powers are sorted by frequency from lower
         * to higher. Each CTL corresponds to 8 edge power
         * measurements. */
        rep_idx = ctl_idx * AR5K_EEPROM_N_EDGES;

        /* Don't do boundaries check because we
         * might have more that one bands defined
         * for this mode */

        /* Get the edge power that's closer to our
         * frequency */
        for (i = 0; i < AR5K_EEPROM_N_EDGES; i++) {
                rep_idx += i;
                if (target <= rep[rep_idx].freq)
                        edge_pwr = (s16) rep[rep_idx].edge;
        }

        if (edge_pwr) {
                ah->ah_txpower.txp_max_pwr = 4*min(edge_pwr, max_chan_pwr);
        }
}


/*
 * Power to PCDAC table functions
 */

/*
 * Fill Power to PCDAC table on RF5111
 *
 * No further processing is needed for RF5111, the only thing we have to
 * do is fill the values below and above calibration range since eeprom data
 * may not cover the entire PCDAC table.
 */
static void
ath5k_fill_pwr_to_pcdac_table(struct ath5k_hw *ah, s16* table_min,
                                                        s16 *table_max)
{
        u8      *pcdac_out = ah->ah_txpower.txp_pd_table;
        u8      *pcdac_tmp = ah->ah_txpower.tmpL[0];
        u8      pcdac_0, pcdac_n, pcdac_i, pwr_idx, i;
        s16     min_pwr, max_pwr;

        /* Get table boundaries */
        min_pwr = table_min[0];
        pcdac_0 = pcdac_tmp[0];

        max_pwr = table_max[0];
        pcdac_n = pcdac_tmp[table_max[0] - table_min[0]];

        /* Extrapolate below minimum using pcdac_0 */
        pcdac_i = 0;
        for (i = 0; i < min_pwr; i++)
                pcdac_out[pcdac_i++] = pcdac_0;

        /* Copy values from pcdac_tmp */
        pwr_idx = min_pwr;
        for (i = 0 ; pwr_idx <= max_pwr &&
        pcdac_i < AR5K_EEPROM_POWER_TABLE_SIZE; i++) {
                pcdac_out[pcdac_i++] = pcdac_tmp[i];
                pwr_idx++;
        }

        /* Extrapolate above maximum */
        while (pcdac_i < AR5K_EEPROM_POWER_TABLE_SIZE)
                pcdac_out[pcdac_i++] = pcdac_n;

}

/*
 * Combine available XPD Curves and fill Linear Power to PCDAC table
 * on RF5112
 *
 * RFX112 can have up to 2 curves (one for low txpower range and one for
 * higher txpower range). We need to put them both on pcdac_out and place
 * them in the correct location. In case we only have one curve available
 * just fit it on pcdac_out (it's supposed to cover the entire range of
 * available pwr levels since it's always the higher power curve). Extrapolate
 * below and above final table if needed.
 */
static void
ath5k_combine_linear_pcdac_curves(struct ath5k_hw *ah, s16* table_min,
                                                s16 *table_max, u8 pdcurves)
{
        u8      *pcdac_out = ah->ah_txpower.txp_pd_table;
        u8      *pcdac_low_pwr;
        u8      *pcdac_high_pwr;
        u8      *pcdac_tmp;
        u8      pwr;
        s16     max_pwr_idx;
        s16     min_pwr_idx;
        s16     mid_pwr_idx = 0;
        /* Edge flag turs on the 7nth bit on the PCDAC
         * to delcare the higher power curve (force values
         * to be greater than 64). If we only have one curve
         * we don't need to set this, if we have 2 curves and
         * fill the table backwards this can also be used to
         * switch from higher power curve to lower power curve */
        u8      edge_flag;
        int     i;

        /* When we have only one curve available
         * that's the higher power curve. If we have
         * two curves the first is the high power curve
         * and the next is the low power curve. */
        if (pdcurves > 1) {
                pcdac_low_pwr = ah->ah_txpower.tmpL[1];
                pcdac_high_pwr = ah->ah_txpower.tmpL[0];
                mid_pwr_idx = table_max[1] - table_min[1] - 1;
                max_pwr_idx = (table_max[0] - table_min[0]) / 2;

                /* If table size goes beyond 31.5dB, keep the
                 * upper 31.5dB range when setting tx power.
                 * Note: 126 = 31.5 dB in quarter dB steps */
                if (table_max[0] - table_min[1] > 126)
                        min_pwr_idx = table_max[0] - 126;
                else
                        min_pwr_idx = table_min[1];

                /* Since we fill table backwards
                 * start from high power curve */
                pcdac_tmp = pcdac_high_pwr;

                edge_flag = 0x40;
        } else {
                pcdac_low_pwr = ah->ah_txpower.tmpL[1]; /* Zeroed */
                pcdac_high_pwr = ah->ah_txpower.tmpL[0];
                min_pwr_idx = table_min[0];
                max_pwr_idx = (table_max[0] - table_min[0]) / 2;
                pcdac_tmp = pcdac_high_pwr;
                edge_flag = 0;
        }

        /* This is used when setting tx power*/
        ah->ah_txpower.txp_min_idx = min_pwr_idx/2;

        /* Fill Power to PCDAC table backwards */
        pwr = max_pwr_idx;
        for (i = 63; i >= 0; i--) {
                /* Entering lower power range, reset
                 * edge flag and set pcdac_tmp to lower
                 * power curve.*/
                if (edge_flag == 0x40 &&
                (2*pwr <= (table_max[1] - table_min[0]) || pwr == 0)) {
                        edge_flag = 0x00;
                        pcdac_tmp = pcdac_low_pwr;
                        pwr = mid_pwr_idx/2;
                }

                /* Don't go below 1, extrapolate below if we have
                 * already swithced to the lower power curve -or
                 * we only have one curve and edge_flag is zero
                 * anyway */
                if (pcdac_tmp[pwr] < 1 && (edge_flag == 0x00)) {
                        while (i >= 0) {
                                pcdac_out[i] = pcdac_out[i + 1];
                                i--;
                        }
                        break;
                }

                pcdac_out[i] = pcdac_tmp[pwr] | edge_flag;

                /* Extrapolate above if pcdac is greater than
                 * 126 -this can happen because we OR pcdac_out
                 * value with edge_flag on high power curve */
                if (pcdac_out[i] > 126)
                        pcdac_out[i] = 126;

                /* Decrease by a 0.5dB step */
                pwr--;
        }
}

/* Write PCDAC values on hw */
static void
ath5k_setup_pcdac_table(struct ath5k_hw *ah)
{
        u8      *pcdac_out = ah->ah_txpower.txp_pd_table;
        int     i;

        /*
         * Write TX power values
         */
        for (i = 0; i < (AR5K_EEPROM_POWER_TABLE_SIZE / 2); i++) {
                ath5k_hw_reg_write(ah,
                        (((pcdac_out[2*i + 0] << 8 | 0xff) & 0xffff) << 0) |
                        (((pcdac_out[2*i + 1] << 8 | 0xff) & 0xffff) << 16),
                        AR5K_PHY_PCDAC_TXPOWER(i));
        }
}


/*
 * Power to PDADC table functions
 */

/*
 * Set the gain boundaries and create final Power to PDADC table
 *
 * We can have up to 4 pd curves, we need to do a simmilar process
 * as we do for RF5112. This time we don't have an edge_flag but we
 * set the gain boundaries on a separate register.
 */
static void
ath5k_combine_pwr_to_pdadc_curves(struct ath5k_hw *ah,
                        s16 *pwr_min, s16 *pwr_max, u8 pdcurves)
{
        u8 gain_boundaries[AR5K_EEPROM_N_PD_GAINS];
        u8 *pdadc_out = ah->ah_txpower.txp_pd_table;
        u8 *pdadc_tmp;
        s16 pdadc_0;
        u8 pdadc_i, pdadc_n, pwr_step, pdg, max_idx, table_size;
        u8 pd_gain_overlap;

        /* Note: Register value is initialized on initvals
         * there is no feedback from hw.
         * XXX: What about pd_gain_overlap from EEPROM ? */
        pd_gain_overlap = (u8) ath5k_hw_reg_read(ah, AR5K_PHY_TPC_RG5) &
                AR5K_PHY_TPC_RG5_PD_GAIN_OVERLAP;

        /* Create final PDADC table */
        for (pdg = 0, pdadc_i = 0; pdg < pdcurves; pdg++) {
                pdadc_tmp = ah->ah_txpower.tmpL[pdg];

                if (pdg == pdcurves - 1)
                        /* 2 dB boundary stretch for last
                         * (higher power) curve */
                        gain_boundaries[pdg] = pwr_max[pdg] + 4;
                else
                        /* Set gain boundary in the middle
                         * between this curve and the next one */
                        gain_boundaries[pdg] =
                                (pwr_max[pdg] + pwr_min[pdg + 1]) / 2;

                /* Sanity check in case our 2 db stretch got out of
                 * range. */
                if (gain_boundaries[pdg] > AR5K_TUNE_MAX_TXPOWER)
                        gain_boundaries[pdg] = AR5K_TUNE_MAX_TXPOWER;

                /* For the first curve (lower power)
                 * start from 0 dB */
                if (pdg == 0)
                        pdadc_0 = 0;
                else
                        /* For the other curves use the gain overlap */
                        pdadc_0 = (gain_boundaries[pdg - 1] - pwr_min[pdg]) -
                                                        pd_gain_overlap;

                /* Force each power step to be at least 0.5 dB */
                if ((pdadc_tmp[1] - pdadc_tmp[0]) > 1)
                        pwr_step = pdadc_tmp[1] - pdadc_tmp[0];
                else
                        pwr_step = 1;

                /* If pdadc_0 is negative, we need to extrapolate
                 * below this pdgain by a number of pwr_steps */
                while ((pdadc_0 < 0) && (pdadc_i < 128)) {
                        s16 tmp = pdadc_tmp[0] + pdadc_0 * pwr_step;
                        pdadc_out[pdadc_i++] = (tmp < 0) ? 0 : (u8) tmp;
                        pdadc_0++;
                }

                /* Set last pwr level, using gain boundaries */
                pdadc_n = gain_boundaries[pdg] + pd_gain_overlap - pwr_min[pdg];
                /* Limit it to be inside pwr range */
                table_size = pwr_max[pdg] - pwr_min[pdg];
                max_idx = (pdadc_n < table_size) ? pdadc_n : table_size;

                /* Fill pdadc_out table */
                while (pdadc_0 < max_idx)
                        pdadc_out[pdadc_i++] = pdadc_tmp[pdadc_0++];

                /* Need to extrapolate above this pdgain? */
                if (pdadc_n <= max_idx)
                        continue;

                /* Force each power step to be at least 0.5 dB */
                if ((pdadc_tmp[table_size - 1] - pdadc_tmp[table_size - 2]) > 1)
                        pwr_step = pdadc_tmp[table_size - 1] -
                                                pdadc_tmp[table_size - 2];
                else
                        pwr_step = 1;

                /* Extrapolate above */
                while ((pdadc_0 < (s16) pdadc_n) &&
                (pdadc_i < AR5K_EEPROM_POWER_TABLE_SIZE * 2)) {
                        s16 tmp = pdadc_tmp[table_size - 1] +
                                        (pdadc_0 - max_idx) * pwr_step;
                        pdadc_out[pdadc_i++] = (tmp > 127) ? 127 : (u8) tmp;
                        pdadc_0++;
                }
        }

        while (pdg < AR5K_EEPROM_N_PD_GAINS) {
                gain_boundaries[pdg] = gain_boundaries[pdg - 1];
                pdg++;
        }

        while (pdadc_i < AR5K_EEPROM_POWER_TABLE_SIZE * 2) {
                pdadc_out[pdadc_i] = pdadc_out[pdadc_i - 1];
                pdadc_i++;
        }

        /* Set gain boundaries */
        ath5k_hw_reg_write(ah,
                AR5K_REG_SM(pd_gain_overlap,
                        AR5K_PHY_TPC_RG5_PD_GAIN_OVERLAP) |
                AR5K_REG_SM(gain_boundaries[0],
                        AR5K_PHY_TPC_RG5_PD_GAIN_BOUNDARY_1) |
                AR5K_REG_SM(gain_boundaries[1],
                        AR5K_PHY_TPC_RG5_PD_GAIN_BOUNDARY_2) |
                AR5K_REG_SM(gain_boundaries[2],
                        AR5K_PHY_TPC_RG5_PD_GAIN_BOUNDARY_3) |
                AR5K_REG_SM(gain_boundaries[3],
                        AR5K_PHY_TPC_RG5_PD_GAIN_BOUNDARY_4),
                AR5K_PHY_TPC_RG5);

        /* Used for setting rate power table */
        ah->ah_txpower.txp_min_idx = pwr_min[0];

}

/* Write PDADC values on hw */
static void
ath5k_setup_pwr_to_pdadc_table(struct ath5k_hw *ah,
                        u8 pdcurves, u8 *pdg_to_idx)
{
        u8 *pdadc_out = ah->ah_txpower.txp_pd_table;
        u32 reg;
        u8 i;

        /* Select the right pdgain curves */

        /* Clear current settings */
        reg = ath5k_hw_reg_read(ah, AR5K_PHY_TPC_RG1);
        reg &= ~(AR5K_PHY_TPC_RG1_PDGAIN_1 |
                AR5K_PHY_TPC_RG1_PDGAIN_2 |
                AR5K_PHY_TPC_RG1_PDGAIN_3 |
                AR5K_PHY_TPC_RG1_NUM_PD_GAIN);

        /*
         * Use pd_gains curve from eeprom
         *
         * This overrides the default setting from initvals
         * in case some vendors (e.g. Zcomax) don't use the default
         * curves. If we don't honor their settings we 'll get a
         * 5dB (1 * gain overlap ?) drop.
         */
        reg |= AR5K_REG_SM(pdcurves, AR5K_PHY_TPC_RG1_NUM_PD_GAIN);

        switch (pdcurves) {
        case 3:
                reg |= AR5K_REG_SM(pdg_to_idx[2], AR5K_PHY_TPC_RG1_PDGAIN_3);
                /* Fall through */
        case 2:
                reg |= AR5K_REG_SM(pdg_to_idx[1], AR5K_PHY_TPC_RG1_PDGAIN_2);
                /* Fall through */
        case 1:
                reg |= AR5K_REG_SM(pdg_to_idx[0], AR5K_PHY_TPC_RG1_PDGAIN_1);
                break;
        }
        ath5k_hw_reg_write(ah, reg, AR5K_PHY_TPC_RG1);

        /*
         * Write TX power values
         */
        for (i = 0; i < (AR5K_EEPROM_POWER_TABLE_SIZE / 2); i++) {
                ath5k_hw_reg_write(ah,
                        ((pdadc_out[4*i + 0] & 0xff) << 0) |
                        ((pdadc_out[4*i + 1] & 0xff) << 8) |
                        ((pdadc_out[4*i + 2] & 0xff) << 16) |
                        ((pdadc_out[4*i + 3] & 0xff) << 24),
                        AR5K_PHY_PDADC_TXPOWER(i));
        }
}


/*
 * Common code for PCDAC/PDADC tables
 */

/*
 * This is the main function that uses all of the above
 * to set PCDAC/PDADC table on hw for the current channel.
 * This table is used for tx power calibration on the basband,
 * without it we get weird tx power levels and in some cases
 * distorted spectral mask
 */
static int
ath5k_setup_channel_powertable(struct ath5k_hw *ah,
                        struct net80211_channel *channel,
                        u8 ee_mode, u8 type)
{
        struct ath5k_pdgain_info *pdg_L, *pdg_R;
        struct ath5k_chan_pcal_info *pcinfo_L;
        struct ath5k_chan_pcal_info *pcinfo_R;
        struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
        u8 *pdg_curve_to_idx = ee->ee_pdc_to_idx[ee_mode];
        s16 table_min[AR5K_EEPROM_N_PD_GAINS];
        s16 table_max[AR5K_EEPROM_N_PD_GAINS];
        u8 *tmpL;
        u8 *tmpR;
        u32 target = channel->center_freq;
        int pdg, i;

        /* Get surounding freq piers for this channel */
        ath5k_get_chan_pcal_surrounding_piers(ah, channel,
                                                &pcinfo_L,
                                                &pcinfo_R);

        /* Loop over pd gain curves on
         * surounding freq piers by index */
        for (pdg = 0; pdg < ee->ee_pd_gains[ee_mode]; pdg++) {

                /* Fill curves in reverse order
                 * from lower power (max gain)
                 * to higher power. Use curve -> idx
                 * backmaping we did on eeprom init */
                u8 idx = pdg_curve_to_idx[pdg];

                /* Grab the needed curves by index */
                pdg_L = &pcinfo_L->pd_curves[idx];
                pdg_R = &pcinfo_R->pd_curves[idx];

                /* Initialize the temp tables */
                tmpL = ah->ah_txpower.tmpL[pdg];
                tmpR = ah->ah_txpower.tmpR[pdg];

                /* Set curve's x boundaries and create
                 * curves so that they cover the same
                 * range (if we don't do that one table
                 * will have values on some range and the
                 * other one won't have any so interpolation
                 * will fail) */
                table_min[pdg] = min(pdg_L->pd_pwr[0],
                                        pdg_R->pd_pwr[0]) / 2;

                table_max[pdg] = max(pdg_L->pd_pwr[pdg_L->pd_points - 1],
                                pdg_R->pd_pwr[pdg_R->pd_points - 1]) / 2;

                /* Now create the curves on surrounding channels
                 * and interpolate if needed to get the final
                 * curve for this gain on this channel */
                switch (type) {
                case AR5K_PWRTABLE_LINEAR_PCDAC:
                        /* Override min/max so that we don't loose
                         * accuracy (don't divide by 2) */
                        table_min[pdg] = min(pdg_L->pd_pwr[0],
                                                pdg_R->pd_pwr[0]);

                        table_max[pdg] =
                                max(pdg_L->pd_pwr[pdg_L->pd_points - 1],
                                        pdg_R->pd_pwr[pdg_R->pd_points - 1]);

                        /* Override minimum so that we don't get
                         * out of bounds while extrapolating
                         * below. Don't do this when we have 2
                         * curves and we are on the high power curve
                         * because table_min is ok in this case */
                        if (!(ee->ee_pd_gains[ee_mode] > 1 && pdg == 0)) {

                                table_min[pdg] =
                                        ath5k_get_linear_pcdac_min(pdg_L->pd_step,
                                                                pdg_R->pd_step,
                                                                pdg_L->pd_pwr,
                                                                pdg_R->pd_pwr);

                                /* Don't go too low because we will
                                 * miss the upper part of the curve.
                                 * Note: 126 = 31.5dB (max power supported)
                                 * in 0.25dB units */
                                if (table_max[pdg] - table_min[pdg] > 126)
                                        table_min[pdg] = table_max[pdg] - 126;
                        }

                        /* Fall through */
                case AR5K_PWRTABLE_PWR_TO_PCDAC:
                case AR5K_PWRTABLE_PWR_TO_PDADC:

                        ath5k_create_power_curve(table_min[pdg],
                                                table_max[pdg],
                                                pdg_L->pd_pwr,
                                                pdg_L->pd_step,
                                                pdg_L->pd_points, tmpL, type);

                        /* We are in a calibration
                         * pier, no need to interpolate
                         * between freq piers */
                        if (pcinfo_L == pcinfo_R)
                                continue;

                        ath5k_create_power_curve(table_min[pdg],
                                                table_max[pdg],
                                                pdg_R->pd_pwr,
                                                pdg_R->pd_step,
                                                pdg_R->pd_points, tmpR, type);
                        break;
                default:
                        return -EINVAL;
                }

                /* Interpolate between curves
                 * of surounding freq piers to
                 * get the final curve for this
                 * pd gain. Re-use tmpL for interpolation
                 * output */
                for (i = 0; (i < (u16) (table_max[pdg] - table_min[pdg])) &&
                (i < AR5K_EEPROM_POWER_TABLE_SIZE); i++) {
                        tmpL[i] = (u8) ath5k_get_interpolated_value(target,
                                                        (s16) pcinfo_L->freq,
                                                        (s16) pcinfo_R->freq,
                                                        (s16) tmpL[i],
                                                        (s16) tmpR[i]);
                }
        }

        /* Now we have a set of curves for this
         * channel on tmpL (x range is table_max - table_min
         * and y values are tmpL[pdg][]) sorted in the same
         * order as EEPROM (because we've used the backmaping).
         * So for RF5112 it's from higher power to lower power
         * and for RF2413 it's from lower power to higher power.
         * For RF5111 we only have one curve. */

        /* Fill min and max power levels for this
         * channel by interpolating the values on
         * surounding channels to complete the dataset */
        ah->ah_txpower.txp_min_pwr = ath5k_get_interpolated_value(target,
                                        (s16) pcinfo_L->freq,
                                        (s16) pcinfo_R->freq,
                                        pcinfo_L->min_pwr, pcinfo_R->min_pwr);

        ah->ah_txpower.txp_max_pwr = ath5k_get_interpolated_value(target,
                                        (s16) pcinfo_L->freq,
                                        (s16) pcinfo_R->freq,
                                        pcinfo_L->max_pwr, pcinfo_R->max_pwr);

        /* We are ready to go, fill PCDAC/PDADC
         * table and write settings on hardware */
        switch (type) {
        case AR5K_PWRTABLE_LINEAR_PCDAC:
                /* For RF5112 we can have one or two curves
                 * and each curve covers a certain power lvl
                 * range so we need to do some more processing */
                ath5k_combine_linear_pcdac_curves(ah, table_min, table_max,
                                                ee->ee_pd_gains[ee_mode]);

                /* Set txp.offset so that we can
                 * match max power value with max
                 * table index */
                ah->ah_txpower.txp_offset = 64 - (table_max[0] / 2);

                /* Write settings on hw */
                ath5k_setup_pcdac_table(ah);
                break;
        case AR5K_PWRTABLE_PWR_TO_PCDAC:
                /* We are done for RF5111 since it has only
                 * one curve, just fit the curve on the table */
                ath5k_fill_pwr_to_pcdac_table(ah, table_min, table_max);

                /* No rate powertable adjustment for RF5111 */
                ah->ah_txpower.txp_min_idx = 0;
                ah->ah_txpower.txp_offset = 0;

                /* Write settings on hw */
                ath5k_setup_pcdac_table(ah);
                break;
        case AR5K_PWRTABLE_PWR_TO_PDADC:
                /* Set PDADC boundaries and fill
                 * final PDADC table */
                ath5k_combine_pwr_to_pdadc_curves(ah, table_min, table_max,
                                                ee->ee_pd_gains[ee_mode]);

                /* Write settings on hw */
                ath5k_setup_pwr_to_pdadc_table(ah, pdg, pdg_curve_to_idx);

                /* Set txp.offset, note that table_min
                 * can be negative */
                ah->ah_txpower.txp_offset = table_min[0];
                break;
        default:
                return -EINVAL;
        }

        return 0;
}


/*
 * Per-rate tx power setting
 *
 * This is the code that sets the desired tx power (below
 * maximum) on hw for each rate (we also have TPC that sets
 * power per packet). We do that by providing an index on the
 * PCDAC/PDADC table we set up.
 */

/*
 * Set rate power table
 *
 * For now we only limit txpower based on maximum tx power
 * supported by hw (what's inside rate_info). We need to limit
 * this even more, based on regulatory domain etc.
 *
 * Rate power table contains indices to PCDAC/PDADC table (0.5dB steps)
 * and is indexed as follows:
 * rates[0] - rates[7] -> OFDM rates
 * rates[8] - rates[14] -> CCK rates
 * rates[15] -> XR rates (they all have the same power)
 */
static void
ath5k_setup_rate_powertable(struct ath5k_hw *ah, u16 max_pwr,
                        struct ath5k_rate_pcal_info *rate_info,
                        u8 ee_mode)
{
        unsigned int i;
        u16 *rates;

        /* max_pwr is power level we got from driver/user in 0.5dB
         * units, switch to 0.25dB units so we can compare */
        max_pwr *= 2;
        max_pwr = min(max_pwr, (u16) ah->ah_txpower.txp_max_pwr) / 2;

        /* apply rate limits */
        rates = ah->ah_txpower.txp_rates_power_table;

        /* OFDM rates 6 to 24Mb/s */
        for (i = 0; i < 5; i++)
                rates[i] = min(max_pwr, rate_info->target_power_6to24);

        /* Rest OFDM rates */
        rates[5] = min(rates[0], rate_info->target_power_36);
        rates[6] = min(rates[0], rate_info->target_power_48);
        rates[7] = min(rates[0], rate_info->target_power_54);

        /* CCK rates */
        /* 1L */
        rates[8] = min(rates[0], rate_info->target_power_6to24);
        /* 2L */
        rates[9] = min(rates[0], rate_info->target_power_36);
        /* 2S */
        rates[10] = min(rates[0], rate_info->target_power_36);
        /* 5L */
        rates[11] = min(rates[0], rate_info->target_power_48);
        /* 5S */
        rates[12] = min(rates[0], rate_info->target_power_48);
        /* 11L */
        rates[13] = min(rates[0], rate_info->target_power_54);
        /* 11S */
        rates[14] = min(rates[0], rate_info->target_power_54);

        /* XR rates */
        rates[15] = min(rates[0], rate_info->target_power_6to24);

        /* CCK rates have different peak to average ratio
         * so we have to tweak their power so that gainf
         * correction works ok. For this we use OFDM to
         * CCK delta from eeprom */
        if ((ee_mode == AR5K_EEPROM_MODE_11G) &&
        (ah->ah_phy_revision < AR5K_SREV_PHY_5212A))
                for (i = 8; i <= 15; i++)
                        rates[i] -= ah->ah_txpower.txp_cck_ofdm_gainf_delta;

        ah->ah_txpower.txp_min_pwr = rates[7];
        ah->ah_txpower.txp_max_pwr = rates[0];
        ah->ah_txpower.txp_ofdm = rates[7];
}


/*
 * Set transmition power
 */
int
ath5k_hw_txpower(struct ath5k_hw *ah, struct net80211_channel *channel,
                u8 ee_mode, u8 txpower)
{
        struct ath5k_rate_pcal_info rate_info;
        u8 type;
        int ret;

        if (txpower > AR5K_TUNE_MAX_TXPOWER) {
                DBG("ath5k: invalid tx power %d\n", txpower);
                return -EINVAL;
        }
        if (txpower == 0)
                txpower = AR5K_TUNE_DEFAULT_TXPOWER;

        /* Reset TX power values */
        memset(&ah->ah_txpower, 0, sizeof(ah->ah_txpower));
        ah->ah_txpower.txp_tpc = AR5K_TUNE_TPC_TXPOWER;
        ah->ah_txpower.txp_min_pwr = 0;
        ah->ah_txpower.txp_max_pwr = AR5K_TUNE_MAX_TXPOWER;

        /* Initialize TX power table */
        switch (ah->ah_radio) {
        case AR5K_RF5111:
                type = AR5K_PWRTABLE_PWR_TO_PCDAC;
                break;
        case AR5K_RF5112:
                type = AR5K_PWRTABLE_LINEAR_PCDAC;
                break;
        case AR5K_RF2413:
        case AR5K_RF5413:
        case AR5K_RF2316:
        case AR5K_RF2317:
        case AR5K_RF2425:
                type = AR5K_PWRTABLE_PWR_TO_PDADC;
                break;
        default:
                return -EINVAL;
        }

        /* FIXME: Only on channel/mode change */
        ret = ath5k_setup_channel_powertable(ah, channel, ee_mode, type);
        if (ret)
                return ret;

        /* Limit max power if we have a CTL available */
        ath5k_get_max_ctl_power(ah, channel);

        /* FIXME: Tx power limit for this regdomain
         * XXX: Mac80211/CRDA will do that anyway ? */

        /* FIXME: Antenna reduction stuff */

        /* FIXME: Limit power on turbo modes */

        /* FIXME: TPC scale reduction */

        /* Get surounding channels for per-rate power table
         * calibration */
        ath5k_get_rate_pcal_data(ah, channel, &rate_info);

        /* Setup rate power table */
        ath5k_setup_rate_powertable(ah, txpower, &rate_info, ee_mode);

        /* Write rate power table on hw */
        ath5k_hw_reg_write(ah, AR5K_TXPOWER_OFDM(3, 24) |
                AR5K_TXPOWER_OFDM(2, 16) | AR5K_TXPOWER_OFDM(1, 8) |
                AR5K_TXPOWER_OFDM(0, 0), AR5K_PHY_TXPOWER_RATE1);

        ath5k_hw_reg_write(ah, AR5K_TXPOWER_OFDM(7, 24) |
                AR5K_TXPOWER_OFDM(6, 16) | AR5K_TXPOWER_OFDM(5, 8) |
                AR5K_TXPOWER_OFDM(4, 0), AR5K_PHY_TXPOWER_RATE2);

        ath5k_hw_reg_write(ah, AR5K_TXPOWER_CCK(10, 24) |
                AR5K_TXPOWER_CCK(9, 16) | AR5K_TXPOWER_CCK(15, 8) |
                AR5K_TXPOWER_CCK(8, 0), AR5K_PHY_TXPOWER_RATE3);

        ath5k_hw_reg_write(ah, AR5K_TXPOWER_CCK(14, 24) |
                AR5K_TXPOWER_CCK(13, 16) | AR5K_TXPOWER_CCK(12, 8) |
                AR5K_TXPOWER_CCK(11, 0), AR5K_PHY_TXPOWER_RATE4);

        /* FIXME: TPC support */
        if (ah->ah_txpower.txp_tpc) {
                ath5k_hw_reg_write(ah, AR5K_PHY_TXPOWER_RATE_MAX_TPC_ENABLE |
                        AR5K_TUNE_MAX_TXPOWER, AR5K_PHY_TXPOWER_RATE_MAX);

                ath5k_hw_reg_write(ah,
                        AR5K_REG_MS(AR5K_TUNE_MAX_TXPOWER, AR5K_TPC_ACK) |
                        AR5K_REG_MS(AR5K_TUNE_MAX_TXPOWER, AR5K_TPC_CTS) |
                        AR5K_REG_MS(AR5K_TUNE_MAX_TXPOWER, AR5K_TPC_CHIRP),
                        AR5K_TPC);
        } else {
                ath5k_hw_reg_write(ah, AR5K_PHY_TXPOWER_RATE_MAX |
                        AR5K_TUNE_MAX_TXPOWER, AR5K_PHY_TXPOWER_RATE_MAX);
        }

        return 0;
}

int ath5k_hw_set_txpower_limit(struct ath5k_hw *ah, u8 mode, u8 txpower)
{
        struct net80211_channel *channel = ah->ah_current_channel;

        DBG2("ath5k: changing txpower to %d\n", txpower);

        return ath5k_hw_txpower(ah, channel, mode, txpower);
}

#undef _ATH5K_PHY