ipxe/src/drivers/net/ath5k/ath5k_phy.c

/*
 * 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