path: root/drivers/net/wireless/ath/ath9k/ar9002_calib.c

/*
 * Copyright (c) 2008-2011 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or 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.
 */

#include "hw.h"
#include "hw-ops.h"
#include "ar9002_phy.h"

#define AR9285_CLCAL_REDO_THRESH    1

enum ar9002_cal_types {
	ADC_GAIN_CAL = BIT(0),
	ADC_DC_CAL = BIT(1),
	IQ_MISMATCH_CAL = BIT(2),
};

static bool ar9002_hw_is_cal_supported(struct ath_hw *ah,
				struct ath9k_channel *chan,
				enum ar9002_cal_types cal_type)
{
	bool supported = false;
	switch (ah->supp_cals & cal_type) {
	case IQ_MISMATCH_CAL:
		/* Run IQ Mismatch for non-CCK only */
		if (!IS_CHAN_B(chan))
			supported = true;
		break;
	case ADC_GAIN_CAL:
	case ADC_DC_CAL:
		/* Run ADC Gain Cal for non-CCK & non 2GHz-HT20 only */
		if (!IS_CHAN_B(chan) &&
		    !((IS_CHAN_2GHZ(chan) || IS_CHAN_A_FAST_CLOCK(ah, chan)) &&
		      IS_CHAN_HT20(chan)))
			supported = true;
		break;
	}
	return supported;
}

static void ar9002_hw_setup_calibration(struct ath_hw *ah,
					struct ath9k_cal_list *currCal)
{
	struct ath_common *common = ath9k_hw_common(ah);

	REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4(0),
		      AR_PHY_TIMING_CTRL4_IQCAL_LOG_COUNT_MAX,
		      currCal->calData->calCountMax);

	switch (currCal->calData->calType) {
	case IQ_MISMATCH_CAL:
		REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_IQ);
		ath_dbg(common, ATH_DBG_CALIBRATE,
			"starting IQ Mismatch Calibration\n");
		break;
	case ADC_GAIN_CAL:
		REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_GAIN);
		ath_dbg(common, ATH_DBG_CALIBRATE,
			"starting ADC Gain Calibration\n");
		break;
	case ADC_DC_CAL:
		REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_DC_PER);
		ath_dbg(common, ATH_DBG_CALIBRATE,
			"starting ADC DC Calibration\n");
		break;
	}

	REG_SET_BIT(ah, AR_PHY_TIMING_CTRL4(0),
		    AR_PHY_TIMING_CTRL4_DO_CAL);
}

static bool ar9002_hw_per_calibration(struct ath_hw *ah,
				      struct ath9k_channel *ichan,
				      u8 rxchainmask,
				      struct ath9k_cal_list *currCal)
{
	struct ath9k_hw_cal_data *caldata = ah->caldata;
	bool iscaldone = false;

	if (currCal->calState == CAL_RUNNING) {
		if (!(REG_READ(ah, AR_PHY_TIMING_CTRL4(0)) &
		      AR_PHY_TIMING_CTRL4_DO_CAL)) {

			currCal->calData->calCollect(ah);
			ah->cal_samples++;

			if (ah->cal_samples >=
			    currCal->calData->calNumSamples) {
				int i, numChains = 0;
				for (i = 0; i < AR5416_MAX_CHAINS; i++) {
					if (rxchainmask & (1 << i))
						numChains++;
				}

				currCal->calData->calPostProc(ah, numChains);
				caldata->CalValid |= currCal->calData->calType;
				currCal->calState = CAL_DONE;
				iscaldone = true;
			} else {
				ar9002_hw_setup_calibration(ah, currCal);
			}
		}
	} else if (!(caldata->CalValid & currCal->calData->calType)) {
		ath9k_hw_reset_calibration(ah, currCal);
	}

	return iscaldone;
}

static void ar9002_hw_iqcal_collect(struct ath_hw *ah)
{
	int i;

	for (i = 0; i < AR5416_MAX_CHAINS; i++) {
		ah->totalPowerMeasI[i] +=
			REG_READ(ah, AR_PHY_CAL_MEAS_0(i));
		ah->totalPowerMeasQ[i] +=
			REG_READ(ah, AR_PHY_CAL_MEAS_1(i));
		ah->totalIqCorrMeas[i] +=
			(int32_t) REG_READ(ah, AR_PHY_CAL_MEAS_2(i));
		ath_dbg(ath9k_hw_common(ah), ATH_DBG_CALIBRATE,
			"%d: Chn %d pmi=0x%08x;pmq=0x%08x;iqcm=0x%08x;\n",
			ah->cal_samples, i, ah->totalPowerMeasI[i],