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Diffstat (limited to 'ar5416/ar5416_cal_iq.c')
| -rw-r--r-- | ar5416/ar5416_cal_iq.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/ar5416/ar5416_cal_iq.c b/ar5416/ar5416_cal_iq.c new file mode 100644 index 0000000..7b9ca14 --- /dev/null +++ b/ar5416/ar5416_cal_iq.c @@ -0,0 +1,135 @@ +/* + * 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" + +#ifdef AH_SUPPORT_AR5416 + +#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); +} +#endif /* AH_SUPPORT_AR5416 */ |
