ar5416_cal_iq.c revision 185380
1185380Ssam/* 2185380Ssam * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 3185380Ssam * Copyright (c) 2002-2008 Atheros Communications, Inc. 4185380Ssam * 5185380Ssam * Permission to use, copy, modify, and/or distribute this software for any 6185380Ssam * purpose with or without fee is hereby granted, provided that the above 7185380Ssam * copyright notice and this permission notice appear in all copies. 8185380Ssam * 9185380Ssam * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10185380Ssam * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11185380Ssam * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12185380Ssam * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13185380Ssam * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14185380Ssam * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15185380Ssam * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16185380Ssam * 17185380Ssam * $Id: ar5416_cal_iq.c,v 1.2 2008/11/11 17:43:23 sam Exp $ 18185380Ssam */ 19185380Ssam#include "opt_ah.h" 20185380Ssam 21185380Ssam#ifdef AH_SUPPORT_AR5416 22185380Ssam 23185380Ssam#include "ah.h" 24185380Ssam#include "ah_internal.h" 25185380Ssam#include "ah_devid.h" 26185380Ssam 27185380Ssam#include "ar5416/ar5416.h" 28185380Ssam#include "ar5416/ar5416reg.h" 29185380Ssam#include "ar5416/ar5416phy.h" 30185380Ssam 31185380Ssam/* IQ Cal aliases */ 32185380Ssam#define totalPowerMeasI(i) caldata[0][i].u 33185380Ssam#define totalPowerMeasQ(i) caldata[1][i].u 34185380Ssam#define totalIqCorrMeas(i) caldata[2][i].s 35185380Ssam 36185380Ssam/* 37185380Ssam * Collect data from HW to later perform IQ Mismatch Calibration 38185380Ssam */ 39185380Ssamvoid 40185380Ssamar5416IQCalCollect(struct ath_hal *ah) 41185380Ssam{ 42185380Ssam struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 43185380Ssam int i; 44185380Ssam 45185380Ssam /* 46185380Ssam * Accumulate IQ cal measures for active chains 47185380Ssam */ 48185380Ssam for (i = 0; i < AR5416_MAX_CHAINS; i++) { 49185380Ssam cal->totalPowerMeasI(i) += 50185380Ssam OS_REG_READ(ah, AR_PHY_CAL_MEAS_0(i)); 51185380Ssam cal->totalPowerMeasQ(i) += 52185380Ssam OS_REG_READ(ah, AR_PHY_CAL_MEAS_1(i)); 53185380Ssam cal->totalIqCorrMeas(i) += (int32_t) 54185380Ssam OS_REG_READ(ah, AR_PHY_CAL_MEAS_2(i)); 55185380Ssam HALDEBUG(ah, HAL_DEBUG_PERCAL, 56185380Ssam "%d: Chn %d pmi=0x%08x;pmq=0x%08x;iqcm=0x%08x;\n", 57185380Ssam cal->calSamples, i, cal->totalPowerMeasI(i), 58185380Ssam cal->totalPowerMeasQ(i), cal->totalIqCorrMeas(i)); 59185380Ssam } 60185380Ssam} 61185380Ssam 62185380Ssam/* 63185380Ssam * Use HW data to do IQ Mismatch Calibration 64185380Ssam */ 65185380Ssamvoid 66185380Ssamar5416IQCalibration(struct ath_hal *ah, uint8_t numChains) 67185380Ssam{ 68185380Ssam struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 69185380Ssam int i; 70185380Ssam 71185380Ssam for (i = 0; i < numChains; i++) { 72185380Ssam uint32_t powerMeasI = cal->totalPowerMeasI(i); 73185380Ssam uint32_t powerMeasQ = cal->totalPowerMeasQ(i); 74185380Ssam uint32_t iqCorrMeas = cal->totalIqCorrMeas(i); 75185380Ssam uint32_t qCoffDenom, iCoffDenom; 76185380Ssam int iqCorrNeg; 77185380Ssam 78185380Ssam HALDEBUG(ah, HAL_DEBUG_PERCAL, 79185380Ssam "Start IQ Cal and Correction for Chain %d\n", i); 80185380Ssam HALDEBUG(ah, HAL_DEBUG_PERCAL, 81185380Ssam "Orignal: iq_corr_meas = 0x%08x\n", iqCorrMeas); 82185380Ssam 83185380Ssam iqCorrNeg = 0; 84185380Ssam /* iqCorrMeas is always negative. */ 85185380Ssam if (iqCorrMeas > 0x80000000) { 86185380Ssam iqCorrMeas = (0xffffffff - iqCorrMeas) + 1; 87185380Ssam iqCorrNeg = 1; 88185380Ssam } 89185380Ssam 90185380Ssam HALDEBUG(ah, HAL_DEBUG_PERCAL, " pwr_meas_i = 0x%08x\n", 91185380Ssam powerMeasI); 92185380Ssam HALDEBUG(ah, HAL_DEBUG_PERCAL, " pwr_meas_q = 0x%08x\n", 93185380Ssam powerMeasQ); 94185380Ssam HALDEBUG(ah, HAL_DEBUG_PERCAL, " iqCorrNeg is 0x%08x\n", 95185380Ssam iqCorrNeg); 96185380Ssam 97185380Ssam iCoffDenom = (powerMeasI/2 + powerMeasQ/2)/ 128; 98185380Ssam qCoffDenom = powerMeasQ / 64; 99185380Ssam /* Protect against divide-by-0 */ 100185380Ssam if (powerMeasQ != 0) { 101185380Ssam /* IQ corr_meas is already negated if iqcorr_neg == 1 */ 102185380Ssam int32_t iCoff = iqCorrMeas/iCoffDenom; 103185380Ssam int32_t qCoff = powerMeasI/qCoffDenom - 64; 104185380Ssam 105185380Ssam HALDEBUG(ah, HAL_DEBUG_PERCAL, " iCoff = 0x%08x\n", 106185380Ssam iCoff); 107185380Ssam HALDEBUG(ah, HAL_DEBUG_PERCAL, " qCoff = 0x%08x\n", 108185380Ssam qCoff); 109185380Ssam 110185380Ssam /* Negate iCoff if iqCorrNeg == 0 */ 111185380Ssam iCoff = iCoff & 0x3f; 112185380Ssam HALDEBUG(ah, HAL_DEBUG_PERCAL, 113185380Ssam "New: iCoff = 0x%08x\n", iCoff); 114185380Ssam 115185380Ssam if (iqCorrNeg == 0x0) 116185380Ssam iCoff = 0x40 - iCoff; 117185380Ssam if (qCoff > 15) 118185380Ssam qCoff = 15; 119185380Ssam else if (qCoff <= -16) 120185380Ssam qCoff = 16; 121185380Ssam HALDEBUG(ah, HAL_DEBUG_PERCAL, 122185380Ssam " : iCoff = 0x%x qCoff = 0x%x\n", iCoff, qCoff); 123185380Ssam 124185380Ssam OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4_CHAIN(i), 125185380Ssam AR_PHY_TIMING_CTRL4_IQCORR_Q_I_COFF, iCoff); 126185380Ssam OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4_CHAIN(i), 127185380Ssam AR_PHY_TIMING_CTRL4_IQCORR_Q_Q_COFF, qCoff); 128185380Ssam HALDEBUG(ah, HAL_DEBUG_PERCAL, 129185380Ssam "IQ Cal and Correction done for Chain %d\n", i); 130185380Ssam } 131185380Ssam } 132185380Ssam OS_REG_SET_BIT(ah, AR_PHY_TIMING_CTRL4, 133185380Ssam AR_PHY_TIMING_CTRL4_IQCORR_ENABLE); 134185380Ssam} 135185380Ssam#endif /* AH_SUPPORT_AR5416 */ 136