phy.c 81.7 KB
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/*
 * PHY functions
 *
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 * Copyright (c) 2004-2007 Reyk Floeter <reyk@openbsd.org>
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 * Copyright (c) 2006-2009 Nick Kossifidis <mickflemm@gmail.com>
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 * Copyright (c) 2007-2008 Jiri Slaby <jirislaby@gmail.com>
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 * Copyright (c) 2008-2009 Felix Fietkau <nbd@openwrt.org>
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 *
 * 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.
 *
 */

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#define _ATH5K_PHY

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#include <linux/delay.h>

#include "ath5k.h"
#include "reg.h"
#include "base.h"
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#include "rfbuffer.h"
#include "rfgain.h"
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/*
 * Used to modify RF Banks before writing them to AR5K_RF_BUFFER
 */
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static unsigned int ath5k_hw_rfb_op(struct ath5k_hw *ah,
					const struct ath5k_rf_reg *rf_regs,
					u32 val, u8 reg_id, bool set)
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{
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	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;
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	int i;

	data = 0;
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	rfb = ah->ah_rf_banks;
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	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) {
		ATH5K_PRINTF("Rf register not found!\n");
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		/* should not happen */
		return 0;
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	}

	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];
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	/* Boundary check */
	if (!(col <= 3 && num_bits <= 32 && first_bit + num_bits <= 319)) {
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		ATH5K_PRINTF("invalid values at offset %u\n", offset);
		return 0;
	}

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	entry = ((first_bit - 1) / 8) + offset;
	position = (first_bit - 1) % 8;
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	if (set)
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		data = ath5k_hw_bitswap(val, num_bits);
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	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);
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		if (set) {
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			rfb[entry] &= ~mask;
			rfb[entry] |= ((data << position) << (col * 8)) & mask;
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			data >>= (8 - position);
		} else {
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			data |= (((rfb[entry] & mask) >> (col * 8)) >> position)
				<< bits_shifted;
			bits_shifted += last_bit - position;
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		}

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		bits_left -= 8 - position;
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	}

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

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/**********************\
* 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.
 *
 * 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;

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	/* Send the packet with 2dB below max power as
	 * patent doc suggest */
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	ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txpower.txp_ofdm - 4,
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			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)
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{
	u32 mix, step;
	u32 *rf;
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	const struct ath5k_gain_opt *go;
	const struct ath5k_gain_opt_step *g_step;
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	const struct ath5k_rf_reg *rf_regs;
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	/* 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;
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	rf_regs = rf_regs_5112a;
	ah->ah_rf_regs_count = ARRAY_SIZE(rf_regs_5112a);
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	g_step = &go->go_step[ah->ah_gain.g_step_idx];
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	if (ah->ah_rf_banks == NULL)
		return 0;

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

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

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	/* Mix gain stepping */
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	step = ath5k_hw_rfb_op(ah, rf_regs, 0, AR5K_RF_MIXGAIN_STEP, false);
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	/* Mix gain override */
	mix = g_step->gos_param[0];
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	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;
}

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/* 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 bool ath5k_hw_rf_check_gainf_readback(struct ath5k_hw *ah)
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{
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	const struct ath5k_rf_reg *rf_regs;
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	u32 step, mix_ovr, level[4];
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	u32 *rf;

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

	rf = ah->ah_rf_banks;

	if (ah->ah_radio == AR5K_RF5111) {
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		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,
			false);

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		level[0] = 0;
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		level[1] = (step == 63) ? 50 : step + 4;
		level[2] = (step != 63) ? 64 : level[0];
		level[3] = level[2] + 50 ;
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		ah->ah_gain.g_high = level[3] -
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			(step == 63 ? AR5K_GAIN_DYN_ADJUST_HI_MARGIN : -5);
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		ah->ah_gain.g_low = level[0] +
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			(step == 63 ? AR5K_GAIN_DYN_ADJUST_LO_MARGIN : 0);
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	} else {
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		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,
			false);

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

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		if (mix_ovr == 1) {
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			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]);
}

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/* 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)
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{
	const struct ath5k_gain_opt *go;
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	const struct ath5k_gain_opt_step *g_step;
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	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;
	}

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	g_step = &go->go_step[ah->ah_gain.g_step_idx];
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	if (ah->ah_gain.g_current >= ah->ah_gain.g_high) {
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		/* Reached maximum */
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		if (ah->ah_gain.g_step_idx == 0)
			return -1;
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		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;
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				g_step = &go->go_step[ah->ah_gain.g_step_idx])
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			ah->ah_gain.g_target -= 2 *
			    (go->go_step[--(ah->ah_gain.g_step_idx)].gos_gain -
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			    g_step->gos_gain);
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		ret = 1;
		goto done;
	}

	if (ah->ah_gain.g_current <= ah->ah_gain.g_low) {
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		/* Reached minimum */
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		if (ah->ah_gain.g_step_idx == (go->go_steps_count - 1))
			return -2;
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		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;
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				g_step = &go->go_step[ah->ah_gain.g_step_idx])
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			ah->ah_gain.g_target -= 2 *
			    (go->go_step[++ah->ah_gain.g_step_idx].gos_gain -
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			    g_step->gos_gain);
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		ret = 2;
		goto done;
	}

done:
	ATH5K_DBG(ah->ah_sc, ATH5K_DEBUG_CALIBRATE,
		"ret %d, gain step %u, current gain %u, target gain %u\n",
		ret, ah->ah_gain.g_step_idx, ah->ah_gain.g_current,
		ah->ah_gain.g_target);

	return ret;
}

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/* 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;

	ATH5K_TRACE(ah->ah_sc);

	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 *
\********************/

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/*
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 * Setup RF registers by writing rf buffer on hw
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 */
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int ath5k_hw_rfregs_init(struct ath5k_hw *ah, struct ieee80211_channel *channel,
		unsigned int mode)
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{
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	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;
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	struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
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	u8 ee_mode = 0;
	u32 *rfb;
	int i, obdb = -1, bank = -1;
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	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;
	}
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	/* 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 = kmalloc(sizeof(u32) * ah->ah_rf_banks_size,
								GFP_KERNEL);
		if (ah->ah_rf_banks == NULL) {
			ATH5K_ERR(ah->ah_sc, "out of memory\n");
			return -ENOMEM;
		}
	}
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	/* Copy values to modify them */
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	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) {
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			ATH5K_ERR(ah->ah_sc, "invalid bank\n");
			return -EINVAL;
		}

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

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

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	/* Set Output and Driver bias current (OB/DB) */
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	if (channel->hw_value & CHANNEL_2GHZ) {
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		if (channel->hw_value & CHANNEL_CCK)
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			ee_mode = AR5K_EEPROM_MODE_11B;
		else
			ee_mode = AR5K_EEPROM_MODE_11G;

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		/* 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;
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		ath5k_hw_rfb_op(ah, rf_regs, ee->ee_ob[ee_mode][obdb],
						AR5K_RF_OB_2GHZ, true);
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		ath5k_hw_rfb_op(ah, rf_regs, ee->ee_db[ee_mode][obdb],
						AR5K_RF_DB_2GHZ, true);

	/* 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 */
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		ee_mode = AR5K_EEPROM_MODE_11A;
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		obdb =	 channel->center_freq >= 5725 ? 3 :
			(channel->center_freq >= 5500 ? 2 :
			(channel->center_freq >= 5260 ? 1 :
			 (channel->center_freq > 4000 ? 0 : -1)));
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		if (obdb < 0)
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			return -EINVAL;

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

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

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	g_step = &go->go_step[ah->ah_gain.g_step_idx];
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	/* Bank Modifications (chip-specific) */
	if (ah->ah_radio == AR5K_RF5111) {
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		/* Set gain_F settings according to current step */
		if (channel->hw_value & CHANNEL_OFDM) {
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			AR5K_REG_WRITE_BITS(ah, AR5K_PHY_FRAME_CTL,
					AR5K_PHY_FRAME_CTL_TX_CLIP,
					g_step->gos_param[0]);
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			ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[1],
							AR5K_RF_PWD_90, true);
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			ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[2],
							AR5K_RF_PWD_84, true);
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			ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[3],
						AR5K_RF_RFGAIN_SEL, true);
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			/* We programmed gain_F parameters, switch back
			 * to active state */
			ah->ah_gain.g_state = AR5K_RFGAIN_ACTIVE;
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		}
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		/* Bank 6/7 setup */
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		ath5k_hw_rfb_op(ah, rf_regs, !ee->ee_xpd[ee_mode],
						AR5K_RF_PWD_XPD, true);
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		ath5k_hw_rfb_op(ah, rf_regs, ee->ee_x_gain[ee_mode],
						AR5K_RF_XPD_GAIN, true);
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		ath5k_hw_rfb_op(ah, rf_regs, ee->ee_i_gain[ee_mode],
						AR5K_RF_GAIN_I, true);
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		ath5k_hw_rfb_op(ah, rf_regs, ee->ee_xpd[ee_mode],
						AR5K_RF_PLO_SEL, true);
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		/* TODO: Half/quarter channel support */
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	}

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	if (ah->ah_radio == AR5K_RF5112) {
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		/* Set gain_F settings according to current step */
		if (channel->hw_value & CHANNEL_OFDM) {
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			ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[0],
						AR5K_RF_MIXGAIN_OVR, true);
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			ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[1],
						AR5K_RF_PWD_138, true);
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			ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[2],
						AR5K_RF_PWD_137, true);
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			ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[3],
						AR5K_RF_PWD_136, true);
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			ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[4],
						AR5K_RF_PWD_132, true);
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			ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[5],
						AR5K_RF_PWD_131, true);
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			ath5k_hw_rfb_op(ah, rf_regs, g_step->gos_param[6],
						AR5K_RF_PWD_130, true);
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			/* We programmed gain_F parameters, switch back
			 * to active state */
			ah->ah_gain.g_state = AR5K_RFGAIN_ACTIVE;
		}
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		/* Bank 6/7 setup */
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		ath5k_hw_rfb_op(ah, rf_regs, ee->ee_xpd[ee_mode],
						AR5K_RF_XPD_SEL, true);
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		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, true);
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		} else {
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			u8 *pdg_curve_to_idx = ee->ee_pdc_to_idx[ee_mode];
			if (ee->ee_pd_gains[ee_mode] > 1) {
				ath5k_hw_rfb_op(ah, rf_regs,
						pdg_curve_to_idx[0],
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						AR5K_RF_PD_GAIN_LO, true);
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				ath5k_hw_rfb_op(ah, rf_regs,
						pdg_curve_to_idx[1],
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						AR5K_RF_PD_GAIN_HI, true);
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			} else {
				ath5k_hw_rfb_op(ah, rf_regs,
						pdg_curve_to_idx[0],
						AR5K_RF_PD_GAIN_LO, true);
				ath5k_hw_rfb_op(ah, rf_regs,
						pdg_curve_to_idx[0],
						AR5K_RF_PD_GAIN_HI, true);
			}
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			/* Lower synth voltage on Rev 2 */
			ath5k_hw_rfb_op(ah, rf_regs, 2,
					AR5K_RF_HIGH_VC_CP, true);
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			ath5k_hw_rfb_op(ah, rf_regs, 2,
					AR5K_RF_MID_VC_CP, true);
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			ath5k_hw_rfb_op(ah, rf_regs, 2,
					AR5K_RF_LOW_VC_CP, true);
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			ath5k_hw_rfb_op(ah, rf_regs, 2,
					AR5K_RF_PUSH_UP, true);
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			/* 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, true);
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				ath5k_hw_rfb_op(ah, rf_regs, 1,
						AR5K_RF_XB2_LVL, true);
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				ath5k_hw_rfb_op(ah, rf_regs, 1,
						AR5K_RF_XB5_LVL, true);
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				ath5k_hw_rfb_op(ah, rf_regs, 1,
						AR5K_RF_PWD_167, true);
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				ath5k_hw_rfb_op(ah, rf_regs, 1,
						AR5K_RF_PWD_166, true);
			}
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		}

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		ath5k_hw_rfb_op(ah, rf_regs, ee->ee_i_gain[ee_mode],
						AR5K_RF_GAIN_I, true);
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		/* TODO: Half/quarter channel support */
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	}
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	if (ah->ah_radio == AR5K_RF5413 &&
	channel->hw_value & CHANNEL_2GHZ) {
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		ath5k_hw_rfb_op(ah, rf_regs, 1, AR5K_RF_DERBY_CHAN_SEL_MODE,
									true);
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		/* 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, true);
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	}

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	/* 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);
	}
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	return 0;
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}


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

/*
 * Check if a channel is supported
 */
bool 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 true;
	} 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 true;

	return false;
}

/*
 * Convertion needed for RF5110
 */
static u32 ath5k_hw_rf5110_chan2athchan(struct ieee80211_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.
	 */
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	athchan = (ath5k_hw_bitswap(
			(ieee80211_frequency_to_channel(
				channel->center_freq) - 24) / 2, 5)
				<< 1) | (1 << 6) | 0x1;
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	return athchan;
}

/*
 * Set channel on RF5110
 */
static int ath5k_hw_rf5110_channel(struct ath5k_hw *ah,
		struct ieee80211_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 ieee80211_channel *channel)
{
	struct ath5k_athchan_2ghz ath5k_channel_2ghz;
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	unsigned int ath5k_channel =
		ieee80211_frequency_to_channel(channel->center_freq);
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	u32 data0, data1, clock;
	int ret;

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

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	if (channel->hw_value & CHANNEL_2GHZ) {
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		/* Map 2GHz channel to 5GHz Atheros channel ID */
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		ret = ath5k_hw_rf5111_chan2athchan(
			ieee80211_frequency_to_channel(channel->center_freq),
			&ath5k_channel_2ghz);
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		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 ieee80211_channel *channel)
{
	u32 data, data0, data1, data2;
	u16 c;

	data = data0 = data1 = data2 = 0;
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	c = channel->center_freq;
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	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);
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	} else if ((c - (c % 5)) != 2 || c > 5435) {
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		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;
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	} else {
		data0 = ath5k_hw_bitswap((10 * (c - 2) - 4800) / 25 + 1, 8);
		data2 = ath5k_hw_bitswap(0, 2);
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	}

	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;
}

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/*
 * Set the channel on the RF2425
 */
static int ath5k_hw_rf2425_channel(struct ath5k_hw *ah,
		struct ieee80211_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;
}

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/*
 * Set a channel on the radio chip
 */
int ath5k_hw_channel(struct ath5k_hw *ah, struct ieee80211_channel *channel)
{
	int ret;
	/*
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	 * 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)) {
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		ATH5K_ERR(ah->ah_sc,
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			"channel frequency (%u MHz) out of supported "
			"band range\n",
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			channel->center_freq);
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			return -EINVAL;
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	}

	/*
	 * 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;
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	case AR5K_RF2425:
		ret = ath5k_hw_rf2425_channel(ah, channel);
		break;
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	default:
		ret = ath5k_hw_rf5112_channel(ah, channel);
		break;
	}

	if (ret)
		return ret;

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	/* 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);
	}

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	ah->ah_current_channel = channel;
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	ah->ah_turbo = channel->hw_value == CHANNEL_T ? true : false;
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	return 0;
}

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

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void
ath5k_hw_calibration_poll(struct ath5k_hw *ah)
{
	/* Calibration interval in jiffies */
	unsigned long cal_intval;

	cal_intval = msecs_to_jiffies(ah->ah_cal_intval * 1000);

	/* Initialize timestamp if needed */
	if (!ah->ah_cal_tstamp)
		ah->ah_cal_tstamp = jiffies;

	/* For now we always do full calibration
	 * Mark software interrupt mask and fire software
	 * interrupt (bit gets auto-cleared) */
	if (time_is_before_eq_jiffies(ah->ah_cal_tstamp + cal_intval)) {
		ah->ah_cal_tstamp = jiffies;
		ah->ah_swi_mask = AR5K_SWI_FULL_CALIBRATION;
		AR5K_REG_ENABLE_BITS(ah, AR5K_CR, AR5K_CR_SWI);
	}
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}
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static int sign_extend(int val, const int nbits)
{
	int order = BIT(nbits-1);
	return (val ^ order) - order;
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}

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static s32 ath5k_hw_read_measured_noise_floor(struct ath5k_hw *ah)
{
	s32 val;

	val = ath5k_hw_reg_read(ah, AR5K_PHY_NF);
	return sign_extend(AR5K_REG_MS(val, AR5K_PHY_NF_MINCCA_PWR), 9);
}

void ath5k_hw_init_nfcal_hist(struct ath5k_hw *ah)
{
	int i;

	ah->ah_nfcal_hist.index = 0;
	for (i = 0; i < ATH5K_NF_CAL_HIST_MAX; i++)
		ah->ah_nfcal_hist.nfval[i] = AR5K_TUNE_CCA_MAX_GOOD_VALUE;
}

static void ath5k_hw_update_nfcal_hist(struct ath5k_hw *ah, s16 noise_floor)
{
	struct ath5k_nfcal_hist *hist = &ah->ah_nfcal_hist;
	hist->index = (hist->index + 1) & (ATH5K_NF_CAL_HIST_MAX-1);
	hist->nfval[hist->index] = noise_floor;
}

static s16 ath5k_hw_get_median_noise_floor(struct ath5k_hw *ah)
{
	s16 sort[ATH5K_NF_CAL_HIST_MAX];
	s16 tmp;
	int i, j;

	memcpy(sort, ah->ah_nfcal_hist.nfval, sizeof(sort));
	for (i = 0; i < ATH5K_NF_CAL_HIST_MAX - 1; i++) {
		for (j = 1; j < ATH5K_NF_CAL_HIST_MAX - i; j++) {
			if (sort[j] > sort[j-1]) {
				tmp = sort[j];
				sort[j] = sort[j-1];
				sort[j-1] = tmp;
			}
		}
	}
	for (i = 0; i < ATH5K_NF_CAL_HIST_MAX; i++) {
		ATH5K_DBG(ah->ah_sc, ATH5K_DEBUG_CALIBRATE,
			"cal %d:%d\n", i, sort[i]);
	}
	return sort[(ATH5K_NF_CAL_HIST_MAX-1) / 2];
}

/*
 * When we tell the hardware to perform a noise floor calibration
 * by setting the AR5K_PHY_AGCCTL_NF bit, it will periodically
 * sample-and-hold the minimum noise level seen at the antennas.
 * This value is then stored in a ring buffer of recently measured
 * noise floor values so we have a moving window of the last few
 * samples.
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 * The median of the values in the history is then loaded into the
 * hardware for its own use for RSSI and CCA measurements.
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 */
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void ath5k_hw_update_noise_floor(struct ath5k_hw *ah)
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{
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	struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
	u32 val;
	s16 nf, threshold;
	u8 ee_mode;
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	/* keep last value if calibration hasn't completed */
	if (ath5k_hw_reg_read(ah, AR5K_PHY_AGCCTL) & AR5K_PHY_AGCCTL_NF) {
		ATH5K_DBG(ah->ah_sc, ATH5K_DEBUG_CALIBRATE,
			"NF did not complete in calibration window\n");
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		return;
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	}

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	switch (ah->ah_current_channel->hw_value & CHANNEL_MODES) {
	case CHANNEL_A:
	case CHANNEL_T:
	case CHANNEL_XR:
		ee_mode = AR5K_EEPROM_MODE_11A;
		break;
	case CHANNEL_G:
	case CHANNEL_TG:
		ee_mode = AR5K_EEPROM_MODE_11G;
		break;
	default:
	case CHANNEL_B:
		ee_mode = AR5K_EEPROM_MODE_11B;
		break;
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	}


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	/* completed NF calibration, test threshold */
	nf = ath5k_hw_read_measured_noise_floor(ah);
	threshold = ee->ee_noise_floor_thr[ee_mode];

	if (nf > threshold) {
		ATH5K_DBG(ah->ah_sc, ATH5K_DEBUG_CALIBRATE,
			"noise floor failure detected; "
			"read %d, threshold %d\n",
			nf, threshold);

		nf = AR5K_TUNE_CCA_MAX_GOOD_VALUE;
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	}

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	ath5k_hw_update_nfcal_hist(ah, nf);
	nf = ath5k_hw_get_median_noise_floor(ah);
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	/* load noise floor (in .5 dBm) so the hardware will use it */
	val = ath5k_hw_reg_read(ah, AR5K_PHY_NF) & ~AR5K_PHY_NF_M;
	val |= (nf * 2) & AR5K_PHY_NF_M;
	ath5k_hw_reg_write(ah, val, AR5K_PHY_NF);

	AR5K_REG_MASKED_BITS(ah, AR5K_PHY_AGCCTL, AR5K_PHY_AGCCTL_NF,
		~(AR5K_PHY_AGCCTL_NF_EN | AR5K_PHY_AGCCTL_NF_NOUPDATE));

	ath5k_hw_register_timeout(ah, AR5K_PHY_AGCCTL, AR5K_PHY_AGCCTL_NF,
		0, false);

	/*
	 * Load a high max CCA Power value (-50 dBm in .5 dBm units)
	 * so that we're not capped by the median we just loaded.
	 * This will be used as the initial value for the next noise
	 * floor calibration.
	 */
	val = (val & ~AR5K_PHY_NF_M) | ((-50 * 2) & AR5K_PHY_NF_M);
	ath5k_hw_reg_write(ah, val, AR5K_PHY_NF);
	AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_AGCCTL,
		AR5K_PHY_AGCCTL_NF_EN |
		AR5K_PHY_AGCCTL_NF_NOUPDATE |
		AR5K_PHY_AGCCTL_NF);

	ah->ah_noise_floor = nf;

	ATH5K_DBG(ah->ah_sc, ATH5K_DEBUG_CALIBRATE,
		"noise floor calibrated: %d\n", nf);
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}

/*
 * 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 ieee80211_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);

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	mdelay(2);
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	/*
	 * 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, false);

	/* 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) {
		ATH5K_ERR(ah->ah_sc, "calibration timeout (%uMHz)\n",
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		return ret;
	}

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	/*
	 * 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;
}

/*
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 */
static int ath5k_hw_rf511x_calibrate(struct ath5k_hw *ah,
		struct ieee80211_channel *channel)
{
	u32 i_pwr, q_pwr;
	s32 iq_corr, i_coff, i_coffd, q_coff, q_coffd;
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	ATH5K_TRACE(ah->ah_sc);

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	if (!ah->ah_calibration ||
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		goto done;

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	/* 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);
	}
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	i_coffd = ((i_pwr >> 1) + (q_pwr >> 1)) >> 7;
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	q_coffd = q_pwr >> 7;
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	/* No correction */
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	if (i_coffd == 0 || q_coffd == 0)
		goto done;

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

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	q_coff = (((s32)i_pwr / q_coffd) - 128);
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	/* Boundary check */
	if (q_coff > 15)
		q_coff = 15;
	if (q_coff < -16)
		q_coff = -16;

	/* Commit new I/Q value */
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	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));

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	/* 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);

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	/* 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.*/
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	ath5k_hw_update_noise_floor(ah);
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	/* Initiate a gain_F calibration */
	ath5k_hw_request_rfgain_probe(ah);
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	return 0;
}

/*
 * Perform a PHY calibration
 */
int ath5k_hw_phy_calibrate(struct ath5k_hw *ah,
		struct ieee80211_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;
}

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