| 1 | /* |
| 2 | * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting |
| 3 | * Copyright (c) 2002-2008 Atheros Communications, Inc. |
| 4 | * |
| 5 | * Permission to use, copy, modify, and/or distribute this software for any |
| 6 | * purpose with or without fee is hereby granted, provided that the above |
| 7 | * copyright notice and this permission notice appear in all copies. |
| 8 | * |
| 9 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 15 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 16 | * |
| 17 | * $Id: ar5416_cal_iq.c,v 1.2 2011/03/07 11:25:44 cegger Exp $ |
| 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 | |