133 lines
4.0 KiB
C
133 lines
4.0 KiB
C
/*
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* Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
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* Copyright (c) 2002-2008 Atheros Communications, Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* $FreeBSD$
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*/
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#include "opt_ah.h"
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#include "ah.h"
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#include "ah_internal.h"
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#include "ah_devid.h"
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#include "ar5416/ar5416.h"
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#include "ar5416/ar5416reg.h"
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#include "ar5416/ar5416phy.h"
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/* IQ Cal aliases */
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#define totalPowerMeasI(i) caldata[0][i].u
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#define totalPowerMeasQ(i) caldata[1][i].u
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#define totalIqCorrMeas(i) caldata[2][i].s
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/*
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* Collect data from HW to later perform IQ Mismatch Calibration
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*/
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void
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ar5416IQCalCollect(struct ath_hal *ah)
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{
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struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
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int i;
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/*
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* Accumulate IQ cal measures for active chains
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*/
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for (i = 0; i < AR5416_MAX_CHAINS; i++) {
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cal->totalPowerMeasI(i) +=
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OS_REG_READ(ah, AR_PHY_CAL_MEAS_0(i));
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cal->totalPowerMeasQ(i) +=
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OS_REG_READ(ah, AR_PHY_CAL_MEAS_1(i));
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cal->totalIqCorrMeas(i) += (int32_t)
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OS_REG_READ(ah, AR_PHY_CAL_MEAS_2(i));
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HALDEBUG(ah, HAL_DEBUG_PERCAL,
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"%d: Chn %d pmi=0x%08x;pmq=0x%08x;iqcm=0x%08x;\n",
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cal->calSamples, i, cal->totalPowerMeasI(i),
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cal->totalPowerMeasQ(i), cal->totalIqCorrMeas(i));
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}
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}
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/*
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* Use HW data to do IQ Mismatch Calibration
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*/
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void
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ar5416IQCalibration(struct ath_hal *ah, uint8_t numChains)
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{
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struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
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int i;
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for (i = 0; i < numChains; i++) {
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uint32_t powerMeasI = cal->totalPowerMeasI(i);
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uint32_t powerMeasQ = cal->totalPowerMeasQ(i);
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uint32_t iqCorrMeas = cal->totalIqCorrMeas(i);
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uint32_t qCoffDenom, iCoffDenom;
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int iqCorrNeg;
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HALDEBUG(ah, HAL_DEBUG_PERCAL,
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"Start IQ Cal and Correction for Chain %d\n", i);
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HALDEBUG(ah, HAL_DEBUG_PERCAL,
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"Orignal: iq_corr_meas = 0x%08x\n", iqCorrMeas);
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iqCorrNeg = 0;
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/* iqCorrMeas is always negative. */
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if (iqCorrMeas > 0x80000000) {
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iqCorrMeas = (0xffffffff - iqCorrMeas) + 1;
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iqCorrNeg = 1;
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}
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HALDEBUG(ah, HAL_DEBUG_PERCAL, " pwr_meas_i = 0x%08x\n",
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powerMeasI);
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HALDEBUG(ah, HAL_DEBUG_PERCAL, " pwr_meas_q = 0x%08x\n",
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powerMeasQ);
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HALDEBUG(ah, HAL_DEBUG_PERCAL, " iqCorrNeg is 0x%08x\n",
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iqCorrNeg);
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iCoffDenom = (powerMeasI/2 + powerMeasQ/2)/ 128;
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qCoffDenom = powerMeasQ / 64;
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/* Protect against divide-by-0 */
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if (powerMeasQ != 0) {
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/* IQ corr_meas is already negated if iqcorr_neg == 1 */
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int32_t iCoff = iqCorrMeas/iCoffDenom;
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int32_t qCoff = powerMeasI/qCoffDenom - 64;
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HALDEBUG(ah, HAL_DEBUG_PERCAL, " iCoff = 0x%08x\n",
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iCoff);
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HALDEBUG(ah, HAL_DEBUG_PERCAL, " qCoff = 0x%08x\n",
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qCoff);
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/* Negate iCoff if iqCorrNeg == 0 */
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iCoff = iCoff & 0x3f;
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HALDEBUG(ah, HAL_DEBUG_PERCAL,
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"New: iCoff = 0x%08x\n", iCoff);
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if (iqCorrNeg == 0x0)
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iCoff = 0x40 - iCoff;
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if (qCoff > 15)
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qCoff = 15;
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else if (qCoff <= -16)
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qCoff = 16;
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HALDEBUG(ah, HAL_DEBUG_PERCAL,
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" : iCoff = 0x%x qCoff = 0x%x\n", iCoff, qCoff);
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OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4_CHAIN(i),
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AR_PHY_TIMING_CTRL4_IQCORR_Q_I_COFF, iCoff);
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OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4_CHAIN(i),
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AR_PHY_TIMING_CTRL4_IQCORR_Q_Q_COFF, qCoff);
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HALDEBUG(ah, HAL_DEBUG_PERCAL,
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"IQ Cal and Correction done for Chain %d\n", i);
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}
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}
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OS_REG_SET_BIT(ah, AR_PHY_TIMING_CTRL4,
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AR_PHY_TIMING_CTRL4_IQCORR_ENABLE);
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}
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