1 /*- 2 * SPDX-License-Identifier: ISC 3 * 4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 5 * Copyright (c) 2002-2008 Atheros Communications, Inc. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 #include "opt_ah.h" 20 21 #include "ah.h" 22 #include "ah_internal.h" 23 #include "ah_devid.h" 24 25 #include "ar5416/ar5416.h" 26 #include "ar5416/ar5416reg.h" 27 #include "ar5416/ar5416phy.h" 28 29 /* IQ Cal aliases */ 30 #define totalPowerMeasI(i) caldata[0][i].u 31 #define totalPowerMeasQ(i) caldata[1][i].u 32 #define totalIqCorrMeas(i) caldata[2][i].s 33 34 /* 35 * Collect data from HW to later perform IQ Mismatch Calibration 36 */ 37 void 38 ar5416IQCalCollect(struct ath_hal *ah) 39 { 40 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 41 int i; 42 43 /* 44 * Accumulate IQ cal measures for active chains 45 */ 46 for (i = 0; i < AR5416_MAX_CHAINS; i++) { 47 cal->totalPowerMeasI(i) += 48 OS_REG_READ(ah, AR_PHY_CAL_MEAS_0(i)); 49 cal->totalPowerMeasQ(i) += 50 OS_REG_READ(ah, AR_PHY_CAL_MEAS_1(i)); 51 cal->totalIqCorrMeas(i) += (int32_t) 52 OS_REG_READ(ah, AR_PHY_CAL_MEAS_2(i)); 53 HALDEBUG(ah, HAL_DEBUG_PERCAL, 54 "%d: Chn %d pmi=0x%08x;pmq=0x%08x;iqcm=0x%08x;\n", 55 cal->calSamples, i, cal->totalPowerMeasI(i), 56 cal->totalPowerMeasQ(i), cal->totalIqCorrMeas(i)); 57 } 58 } 59 60 /* 61 * Use HW data to do IQ Mismatch Calibration 62 */ 63 void 64 ar5416IQCalibration(struct ath_hal *ah, uint8_t numChains) 65 { 66 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal; 67 int i; 68 69 for (i = 0; i < numChains; i++) { 70 uint32_t powerMeasI = cal->totalPowerMeasI(i); 71 uint32_t powerMeasQ = cal->totalPowerMeasQ(i); 72 uint32_t iqCorrMeas = cal->totalIqCorrMeas(i); 73 uint32_t qCoffDenom, iCoffDenom; 74 int iqCorrNeg; 75 76 HALDEBUG(ah, HAL_DEBUG_PERCAL, 77 "Start IQ Cal and Correction for Chain %d\n", i); 78 HALDEBUG(ah, HAL_DEBUG_PERCAL, 79 "Orignal: iq_corr_meas = 0x%08x\n", iqCorrMeas); 80 81 iqCorrNeg = 0; 82 /* iqCorrMeas is always negative. */ 83 if (iqCorrMeas > 0x80000000) { 84 iqCorrMeas = (0xffffffff - iqCorrMeas) + 1; 85 iqCorrNeg = 1; 86 } 87 88 HALDEBUG(ah, HAL_DEBUG_PERCAL, " pwr_meas_i = 0x%08x\n", 89 powerMeasI); 90 HALDEBUG(ah, HAL_DEBUG_PERCAL, " pwr_meas_q = 0x%08x\n", 91 powerMeasQ); 92 HALDEBUG(ah, HAL_DEBUG_PERCAL, " iqCorrNeg is 0x%08x\n", 93 iqCorrNeg); 94 95 iCoffDenom = (powerMeasI/2 + powerMeasQ/2)/ 128; 96 qCoffDenom = powerMeasQ / 64; 97 /* Protect against divide-by-0 */ 98 if (powerMeasQ != 0) { 99 /* IQ corr_meas is already negated if iqcorr_neg == 1 */ 100 int32_t iCoff = iqCorrMeas/iCoffDenom; 101 int32_t qCoff = powerMeasI/qCoffDenom - 64; 102 103 HALDEBUG(ah, HAL_DEBUG_PERCAL, " iCoff = 0x%08x\n", 104 iCoff); 105 HALDEBUG(ah, HAL_DEBUG_PERCAL, " qCoff = 0x%08x\n", 106 qCoff); 107 108 /* Negate iCoff if iqCorrNeg == 0 */ 109 iCoff = iCoff & 0x3f; 110 HALDEBUG(ah, HAL_DEBUG_PERCAL, 111 "New: iCoff = 0x%08x\n", iCoff); 112 113 if (iqCorrNeg == 0x0) 114 iCoff = 0x40 - iCoff; 115 if (qCoff > 15) 116 qCoff = 15; 117 else if (qCoff <= -16) 118 qCoff = -16; 119 HALDEBUG(ah, HAL_DEBUG_PERCAL, 120 " : iCoff = 0x%x qCoff = 0x%x\n", iCoff, qCoff); 121 122 OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4_CHAIN(i), 123 AR_PHY_TIMING_CTRL4_IQCORR_Q_I_COFF, iCoff); 124 OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4_CHAIN(i), 125 AR_PHY_TIMING_CTRL4_IQCORR_Q_Q_COFF, qCoff); 126 HALDEBUG(ah, HAL_DEBUG_PERCAL, 127 "IQ Cal and Correction done for Chain %d\n", i); 128 } 129 } 130 OS_REG_SET_BIT(ah, AR_PHY_TIMING_CTRL4, 131 AR_PHY_TIMING_CTRL4_IQCORR_ENABLE); 132 } 133