freebsd-nq/sys/dev/ath/ath_hal/ar5416/ar5416_cal_iq.c
2008-12-01 16:43:08 +00:00

133 lines
4.0 KiB
C

/*
* Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
* Copyright (c) 2002-2008 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.
*
* $Id: ar5416_cal_iq.c,v 1.2 2008/11/11 17:43:23 sam Exp $
*/
#include "opt_ah.h"
#include "ah.h"
#include "ah_internal.h"
#include "ah_devid.h"
#include "ar5416/ar5416.h"
#include "ar5416/ar5416reg.h"
#include "ar5416/ar5416phy.h"
/* IQ Cal aliases */
#define totalPowerMeasI(i) caldata[0][i].u
#define totalPowerMeasQ(i) caldata[1][i].u
#define totalIqCorrMeas(i) caldata[2][i].s
/*
* Collect data from HW to later perform IQ Mismatch Calibration
*/
void
ar5416IQCalCollect(struct ath_hal *ah)
{
struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
int i;
/*
* Accumulate IQ cal measures for active chains
*/
for (i = 0; i < AR5416_MAX_CHAINS; i++) {
cal->totalPowerMeasI(i) +=
OS_REG_READ(ah, AR_PHY_CAL_MEAS_0(i));
cal->totalPowerMeasQ(i) +=
OS_REG_READ(ah, AR_PHY_CAL_MEAS_1(i));
cal->totalIqCorrMeas(i) += (int32_t)
OS_REG_READ(ah, AR_PHY_CAL_MEAS_2(i));
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"%d: Chn %d pmi=0x%08x;pmq=0x%08x;iqcm=0x%08x;\n",
cal->calSamples, i, cal->totalPowerMeasI(i),
cal->totalPowerMeasQ(i), cal->totalIqCorrMeas(i));
}
}
/*
* Use HW data to do IQ Mismatch Calibration
*/
void
ar5416IQCalibration(struct ath_hal *ah, uint8_t numChains)
{
struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
int i;
for (i = 0; i < numChains; i++) {
uint32_t powerMeasI = cal->totalPowerMeasI(i);
uint32_t powerMeasQ = cal->totalPowerMeasQ(i);
uint32_t iqCorrMeas = cal->totalIqCorrMeas(i);
uint32_t qCoffDenom, iCoffDenom;
int iqCorrNeg;
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"Start IQ Cal and Correction for Chain %d\n", i);
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"Orignal: iq_corr_meas = 0x%08x\n", iqCorrMeas);
iqCorrNeg = 0;
/* iqCorrMeas is always negative. */
if (iqCorrMeas > 0x80000000) {
iqCorrMeas = (0xffffffff - iqCorrMeas) + 1;
iqCorrNeg = 1;
}
HALDEBUG(ah, HAL_DEBUG_PERCAL, " pwr_meas_i = 0x%08x\n",
powerMeasI);
HALDEBUG(ah, HAL_DEBUG_PERCAL, " pwr_meas_q = 0x%08x\n",
powerMeasQ);
HALDEBUG(ah, HAL_DEBUG_PERCAL, " iqCorrNeg is 0x%08x\n",
iqCorrNeg);
iCoffDenom = (powerMeasI/2 + powerMeasQ/2)/ 128;
qCoffDenom = powerMeasQ / 64;
/* Protect against divide-by-0 */
if (powerMeasQ != 0) {
/* IQ corr_meas is already negated if iqcorr_neg == 1 */
int32_t iCoff = iqCorrMeas/iCoffDenom;
int32_t qCoff = powerMeasI/qCoffDenom - 64;
HALDEBUG(ah, HAL_DEBUG_PERCAL, " iCoff = 0x%08x\n",
iCoff);
HALDEBUG(ah, HAL_DEBUG_PERCAL, " qCoff = 0x%08x\n",
qCoff);
/* Negate iCoff if iqCorrNeg == 0 */
iCoff = iCoff & 0x3f;
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"New: iCoff = 0x%08x\n", iCoff);
if (iqCorrNeg == 0x0)
iCoff = 0x40 - iCoff;
if (qCoff > 15)
qCoff = 15;
else if (qCoff <= -16)
qCoff = 16;
HALDEBUG(ah, HAL_DEBUG_PERCAL,
" : iCoff = 0x%x qCoff = 0x%x\n", iCoff, qCoff);
OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4_CHAIN(i),
AR_PHY_TIMING_CTRL4_IQCORR_Q_I_COFF, iCoff);
OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4_CHAIN(i),
AR_PHY_TIMING_CTRL4_IQCORR_Q_Q_COFF, qCoff);
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"IQ Cal and Correction done for Chain %d\n", i);
}
}
OS_REG_SET_BIT(ah, AR_PHY_TIMING_CTRL4,
AR_PHY_TIMING_CTRL4_IQCORR_ENABLE);
}