2 * SPDX-License-Identifier: ISC
4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
5 * Copyright (c) 2002-2008 Atheros Communications, Inc.
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.
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.
24 #include "ah_internal.h"
27 #include "ar5416/ar5416.h"
28 #include "ar5416/ar5416reg.h"
29 #include "ar5416/ar5416phy.h"
32 #define totalPowerMeasI(i) caldata[0][i].u
33 #define totalPowerMeasQ(i) caldata[1][i].u
34 #define totalIqCorrMeas(i) caldata[2][i].s
37 * Collect data from HW to later perform IQ Mismatch Calibration
40 ar5416IQCalCollect(struct ath_hal *ah)
42 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
46 * Accumulate IQ cal measures for active chains
48 for (i = 0; i < AR5416_MAX_CHAINS; i++) {
49 cal->totalPowerMeasI(i) +=
50 OS_REG_READ(ah, AR_PHY_CAL_MEAS_0(i));
51 cal->totalPowerMeasQ(i) +=
52 OS_REG_READ(ah, AR_PHY_CAL_MEAS_1(i));
53 cal->totalIqCorrMeas(i) += (int32_t)
54 OS_REG_READ(ah, AR_PHY_CAL_MEAS_2(i));
55 HALDEBUG(ah, HAL_DEBUG_PERCAL,
56 "%d: Chn %d pmi=0x%08x;pmq=0x%08x;iqcm=0x%08x;\n",
57 cal->calSamples, i, cal->totalPowerMeasI(i),
58 cal->totalPowerMeasQ(i), cal->totalIqCorrMeas(i));
63 * Use HW data to do IQ Mismatch Calibration
66 ar5416IQCalibration(struct ath_hal *ah, uint8_t numChains)
68 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
71 for (i = 0; i < numChains; i++) {
72 uint32_t powerMeasI = cal->totalPowerMeasI(i);
73 uint32_t powerMeasQ = cal->totalPowerMeasQ(i);
74 uint32_t iqCorrMeas = cal->totalIqCorrMeas(i);
75 uint32_t qCoffDenom, iCoffDenom;
78 HALDEBUG(ah, HAL_DEBUG_PERCAL,
79 "Start IQ Cal and Correction for Chain %d\n", i);
80 HALDEBUG(ah, HAL_DEBUG_PERCAL,
81 "Orignal: iq_corr_meas = 0x%08x\n", iqCorrMeas);
84 /* iqCorrMeas is always negative. */
85 if (iqCorrMeas > 0x80000000) {
86 iqCorrMeas = (0xffffffff - iqCorrMeas) + 1;
90 HALDEBUG(ah, HAL_DEBUG_PERCAL, " pwr_meas_i = 0x%08x\n",
92 HALDEBUG(ah, HAL_DEBUG_PERCAL, " pwr_meas_q = 0x%08x\n",
94 HALDEBUG(ah, HAL_DEBUG_PERCAL, " iqCorrNeg is 0x%08x\n",
97 iCoffDenom = (powerMeasI/2 + powerMeasQ/2)/ 128;
98 qCoffDenom = powerMeasQ / 64;
99 /* Protect against divide-by-0 */
100 if (powerMeasQ != 0) {
101 /* IQ corr_meas is already negated if iqcorr_neg == 1 */
102 int32_t iCoff = iqCorrMeas/iCoffDenom;
103 int32_t qCoff = powerMeasI/qCoffDenom - 64;
105 HALDEBUG(ah, HAL_DEBUG_PERCAL, " iCoff = 0x%08x\n",
107 HALDEBUG(ah, HAL_DEBUG_PERCAL, " qCoff = 0x%08x\n",
110 /* Negate iCoff if iqCorrNeg == 0 */
111 iCoff = iCoff & 0x3f;
112 HALDEBUG(ah, HAL_DEBUG_PERCAL,
113 "New: iCoff = 0x%08x\n", iCoff);
115 if (iqCorrNeg == 0x0)
116 iCoff = 0x40 - iCoff;
119 else if (qCoff <= -16)
121 HALDEBUG(ah, HAL_DEBUG_PERCAL,
122 " : iCoff = 0x%x qCoff = 0x%x\n", iCoff, qCoff);
124 OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4_CHAIN(i),
125 AR_PHY_TIMING_CTRL4_IQCORR_Q_I_COFF, iCoff);
126 OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4_CHAIN(i),
127 AR_PHY_TIMING_CTRL4_IQCORR_Q_Q_COFF, qCoff);
128 HALDEBUG(ah, HAL_DEBUG_PERCAL,
129 "IQ Cal and Correction done for Chain %d\n", i);
132 OS_REG_SET_BIT(ah, AR_PHY_TIMING_CTRL4,
133 AR_PHY_TIMING_CTRL4_IQCORR_ENABLE);