2 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
3 * Copyright (c) 2002-2008 Atheros Communications, Inc.
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.
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.
17 * $FreeBSD: head/sys/dev/ath/ath_hal/ar5416/ar5416_cal_iq.c 203158 2010-01-29 10:07:17Z rpaulo $
23 #include "ah_internal.h"
26 #include "ar5416/ar5416.h"
27 #include "ar5416/ar5416reg.h"
28 #include "ar5416/ar5416phy.h"
31 #define totalPowerMeasI(i) caldata[0][i].u
32 #define totalPowerMeasQ(i) caldata[1][i].u
33 #define totalIqCorrMeas(i) caldata[2][i].s
36 * Collect data from HW to later perform IQ Mismatch Calibration
39 ar5416IQCalCollect(struct ath_hal *ah)
41 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
45 * Accumulate IQ cal measures for active chains
47 for (i = 0; i < AR5416_MAX_CHAINS; i++) {
48 cal->totalPowerMeasI(i) +=
49 OS_REG_READ(ah, AR_PHY_CAL_MEAS_0(i));
50 cal->totalPowerMeasQ(i) +=
51 OS_REG_READ(ah, AR_PHY_CAL_MEAS_1(i));
52 cal->totalIqCorrMeas(i) += (int32_t)
53 OS_REG_READ(ah, AR_PHY_CAL_MEAS_2(i));
54 HALDEBUG(ah, HAL_DEBUG_PERCAL,
55 "%d: Chn %d pmi=0x%08x;pmq=0x%08x;iqcm=0x%08x;\n",
56 cal->calSamples, i, cal->totalPowerMeasI(i),
57 cal->totalPowerMeasQ(i), cal->totalIqCorrMeas(i));
62 * Use HW data to do IQ Mismatch Calibration
65 ar5416IQCalibration(struct ath_hal *ah, uint8_t numChains)
67 struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
70 for (i = 0; i < numChains; i++) {
71 uint32_t powerMeasI = cal->totalPowerMeasI(i);
72 uint32_t powerMeasQ = cal->totalPowerMeasQ(i);
73 uint32_t iqCorrMeas = cal->totalIqCorrMeas(i);
74 uint32_t qCoffDenom, iCoffDenom;
77 HALDEBUG(ah, HAL_DEBUG_PERCAL,
78 "Start IQ Cal and Correction for Chain %d\n", i);
79 HALDEBUG(ah, HAL_DEBUG_PERCAL,
80 "Orignal: iq_corr_meas = 0x%08x\n", iqCorrMeas);
83 /* iqCorrMeas is always negative. */
84 if (iqCorrMeas > 0x80000000) {
85 iqCorrMeas = (0xffffffff - iqCorrMeas) + 1;
89 HALDEBUG(ah, HAL_DEBUG_PERCAL, " pwr_meas_i = 0x%08x\n",
91 HALDEBUG(ah, HAL_DEBUG_PERCAL, " pwr_meas_q = 0x%08x\n",
93 HALDEBUG(ah, HAL_DEBUG_PERCAL, " iqCorrNeg is 0x%08x\n",
96 iCoffDenom = (powerMeasI/2 + powerMeasQ/2)/ 128;
97 qCoffDenom = powerMeasQ / 64;
98 /* Protect against divide-by-0 */
99 if (powerMeasQ != 0) {
100 /* IQ corr_meas is already negated if iqcorr_neg == 1 */
101 int32_t iCoff = iqCorrMeas/iCoffDenom;
102 int32_t qCoff = powerMeasI/qCoffDenom - 64;
104 HALDEBUG(ah, HAL_DEBUG_PERCAL, " iCoff = 0x%08x\n",
106 HALDEBUG(ah, HAL_DEBUG_PERCAL, " qCoff = 0x%08x\n",
109 /* Negate iCoff if iqCorrNeg == 0 */
110 iCoff = iCoff & 0x3f;
111 HALDEBUG(ah, HAL_DEBUG_PERCAL,
112 "New: iCoff = 0x%08x\n", iCoff);
114 if (iqCorrNeg == 0x0)
115 iCoff = 0x40 - iCoff;
118 else if (qCoff <= -16)
120 HALDEBUG(ah, HAL_DEBUG_PERCAL,
121 " : iCoff = 0x%x qCoff = 0x%x\n", iCoff, qCoff);
123 OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4_CHAIN(i),
124 AR_PHY_TIMING_CTRL4_IQCORR_Q_I_COFF, iCoff);
125 OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4_CHAIN(i),
126 AR_PHY_TIMING_CTRL4_IQCORR_Q_Q_COFF, qCoff);
127 HALDEBUG(ah, HAL_DEBUG_PERCAL,
128 "IQ Cal and Correction done for Chain %d\n", i);
131 OS_REG_SET_BIT(ah, AR_PHY_TIMING_CTRL4,
132 AR_PHY_TIMING_CTRL4_IQCORR_ENABLE);