path: root/drivers/net/wireless/ath/ath9k/ar9003_calib.c

/*
 * Copyright (c) 2010-2011 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 "ar9003_phy.h"
#include "ar9003_rtt.h"
#include "ar9003_mci.h"

#define MAX_MEASUREMENT	MAX_IQCAL_MEASUREMENT
#define MAX_MAG_DELTA	11
#define MAX_PHS_DELTA	10

struct coeff {
	int mag_coeff[AR9300_MAX_CHAINS][MAX_MEASUREMENT];
	int phs_coeff[AR9300_MAX_CHAINS][MAX_MEASUREMENT];
	int iqc_coeff[2];
};

enum ar9003_cal_types {
	IQ_MISMATCH_CAL = BIT(0),
	TEMP_COMP_CAL = BIT(1),
};

static void ar9003_hw_setup_calibration(struct ath_hw *ah,
					struct ath9k_cal_list *currCal)
{
	struct ath_common *common = ath9k_hw_common(ah);

	/* Select calibration to run */
	switch (currCal->calData->calType) {
	case IQ_MISMATCH_CAL:
		/*
		 * Start calibration with
		 * 2^(INIT_IQCAL_LOG_COUNT_MAX+1) samples
		 */
		REG_RMW_FIELD(ah, AR_PHY_TIMING4,
			      AR_PHY_TIMING4_IQCAL_LOG_COUNT_MAX,
		currCal->calData->calCountMax);
		REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_IQ);

		ath_dbg(common, CALIBRATE,
			"starting IQ Mismatch Calibration\n");

		/* Kick-off cal */
		REG_SET_BIT(ah, AR_PHY_TIMING4, AR_PHY_TIMING4_DO_CAL);
		break;
	case TEMP_COMP_CAL:
		REG_RMW_FIELD(ah, AR_PHY_65NM_CH0_THERM,
			      AR_PHY_65NM_CH0_THERM_LOCAL, 1);
		REG_RMW_FIELD(ah, AR_PHY_65NM_CH0_THERM,
			      AR_PHY_65NM_CH0_THERM_START, 1);

		ath_dbg(common, CALIBRATE,
			"starting Temperature Compensation Calibration\n");
		break;
	}
}

/*
 * Generic calibration routine.
 * Recalibrate the lower PHY chips to account for temperature/environment
 * changes.
 */
static bool ar9003_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;
	/* Cal is assumed not done until explicitly set below */
	bool iscaldone = false;

	/* Calibration in progress. */
	if (currCal->calState == CAL_RUNNING) {
		/* Check to see if it has finished. */
		if (!(REG_READ(ah, AR_PHY_TIMING4) & AR_PHY_TIMING4_DO_CAL)) {
			/*
			* Accumulate cal measures for active chains
			*/
			currCal->calData->calCollect(ah);
			ah->cal_samples++;

			if (ah->cal_samples >=
			    currCal->calData->calNumSamples) {
				unsigned int i, numChains = 0;
				for (i = 0; i < AR9300_MAX_CHAINS; i++) {
					if (rxchainmask & (1 << i))
						numChains++;
				}

				/*
				* Process accumulated data
				*/
				currCal->calData->calPostProc(ah, numChains);

				/* Calibration has finished. */
				caldata->CalValid |= currCal->calData->calType;
				currCal->calState = CAL_DONE;
				iscaldone = true;
			} else {
			/*
			 * Set-up collection of another sub-sample until we
			 * get desired number
			 */
			ar9003_hw_setup_calibration(ah, currCal);
			}
		}
	} else if (!(caldata->CalValid & currCal->