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      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_adcgain.c,v 1.1.1.1 2008/12/11 04:46:48 alc 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 /* Adc Gain Cal aliases */
     30 #define	totalAdcIOddPhase(i)	caldata[0][i].u
     31 #define	totalAdcIEvenPhase(i)	caldata[1][i].u
     32 #define	totalAdcQOddPhase(i)	caldata[2][i].u
     33 #define	totalAdcQEvenPhase(i)	caldata[3][i].u
     34 
     35 /*
     36  * Collect data from HW to later perform ADC Gain Calibration
     37  */
     38 void
     39 ar5416AdcGainCalCollect(struct ath_hal *ah)
     40 {
     41 	struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
     42 	int i;
     43 
     44 	/*
     45 	* Accumulate ADC Gain cal measures for active chains
     46 	*/
     47 	for (i = 0; i < AR5416_MAX_CHAINS; i++) {
     48 		cal->totalAdcIOddPhase(i) +=
     49 		    OS_REG_READ(ah, AR_PHY_CAL_MEAS_0(i));
     50 		cal->totalAdcIEvenPhase(i) +=
     51 		    OS_REG_READ(ah, AR_PHY_CAL_MEAS_1(i));
     52 		cal->totalAdcQOddPhase(i) +=
     53 		    OS_REG_READ(ah, AR_PHY_CAL_MEAS_2(i));
     54 		cal->totalAdcQEvenPhase(i) +=
     55 		    OS_REG_READ(ah, AR_PHY_CAL_MEAS_3(i));
     56 
     57 		HALDEBUG(ah, HAL_DEBUG_PERCAL,
     58 		    "%d: Chn %d oddi=0x%08x; eveni=0x%08x; oddq=0x%08x; evenq=0x%08x;\n",
     59 		    cal->calSamples, i, cal->totalAdcIOddPhase(i),
     60 		    cal->totalAdcIEvenPhase(i), cal->totalAdcQOddPhase(i),
     61 		    cal->totalAdcQEvenPhase(i));
     62 	}
     63 }
     64 
     65 /*
     66  * Use HW data to do ADC Gain Calibration
     67  */
     68 void
     69 ar5416AdcGainCalibration(struct ath_hal *ah, uint8_t numChains)
     70 {
     71 	struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
     72 	uint32_t i;
     73 
     74 	for (i = 0; i < numChains; i++) {
     75 		uint32_t iOddMeasOffset  = cal->totalAdcIOddPhase(i);
     76 		uint32_t iEvenMeasOffset = cal->totalAdcIEvenPhase(i);
     77 		uint32_t qOddMeasOffset  = cal->totalAdcQOddPhase(i);
     78 		uint32_t qEvenMeasOffset = cal->totalAdcQEvenPhase(i);
     79 
     80 		HALDEBUG(ah, HAL_DEBUG_PERCAL,
     81 		    "Start ADC Gain Cal for Chain %d\n", i);
     82 		HALDEBUG(ah, HAL_DEBUG_PERCAL,
     83 		    "  pwr_meas_odd_i = 0x%08x\n", iOddMeasOffset);
     84 		HALDEBUG(ah, HAL_DEBUG_PERCAL,
     85 		    "  pwr_meas_even_i = 0x%08x\n", iEvenMeasOffset);
     86 		HALDEBUG(ah, HAL_DEBUG_PERCAL,
     87 		    "  pwr_meas_odd_q = 0x%08x\n", qOddMeasOffset);
     88 		HALDEBUG(ah, HAL_DEBUG_PERCAL,
     89 		    "  pwr_meas_even_q = 0x%08x\n", qEvenMeasOffset);
     90 
     91 		if (iOddMeasOffset != 0 && qEvenMeasOffset != 0) {
     92 			uint32_t iGainMismatch =
     93 			    ((iEvenMeasOffset*32)/iOddMeasOffset) & 0x3f;
     94 			uint32_t qGainMismatch =
     95 			    ((qOddMeasOffset*32)/qEvenMeasOffset) & 0x3f;
     96 			uint32_t val;
     97 
     98 			HALDEBUG(ah, HAL_DEBUG_PERCAL,
     99 			    " gain_mismatch_i = 0x%08x\n",
    100 			    iGainMismatch);
    101 			HALDEBUG(ah, HAL_DEBUG_PERCAL,
    102 			    " gain_mismatch_q = 0x%08x\n",
    103 			    qGainMismatch);
    104 
    105 			val = OS_REG_READ(ah, AR_PHY_NEW_ADC_DC_GAIN_CORR(i));
    106 			val &= 0xfffff000;
    107 			val |= (qGainMismatch) | (iGainMismatch << 6);
    108 			OS_REG_WRITE(ah, AR_PHY_NEW_ADC_DC_GAIN_CORR(i), val);
    109 
    110 			HALDEBUG(ah,  HAL_DEBUG_PERCAL,
    111 			    "ADC Gain Cal done for Chain %d\n", i);
    112 		}
    113 	}
    114 	OS_REG_SET_BIT(ah, AR_PHY_NEW_ADC_DC_GAIN_CORR(0),
    115 	    AR_PHY_NEW_ADC_GAIN_CORR_ENABLE);
    116 }
    117