133 lines
4.0 KiB
C
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);
|
|
}
|