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/*
* Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
* Copyright (c) 2002-2008 Atheros Communications, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* $FreeBSD: release/9.1.0/sys/dev/ath/ath_hal/ar5212/ar5212_rfgain.c 188197 2009-02-05 21:13:31Z sam $
*/
#include "opt_ah.h"
#include "ah.h"
#include "ah_internal.h"
#include "ah_devid.h"
#include "ar5212/ar5212.h"
#include "ar5212/ar5212reg.h"
#include "ar5212/ar5212phy.h"
#include "ah_eeprom_v3.h"
static const GAIN_OPTIMIZATION_LADDER gainLadder = {
9, /* numStepsInLadder */
4, /* defaultStepNum */
{ { {4, 1, 1, 1}, 6, "FG8"},
{ {4, 0, 1, 1}, 4, "FG7"},
{ {3, 1, 1, 1}, 3, "FG6"},
{ {4, 0, 0, 1}, 1, "FG5"},
{ {4, 1, 1, 0}, 0, "FG4"}, /* noJack */
{ {4, 0, 1, 0}, -2, "FG3"}, /* halfJack */
{ {3, 1, 1, 0}, -3, "FG2"}, /* clip3 */
{ {4, 0, 0, 0}, -4, "FG1"}, /* noJack */
{ {2, 1, 1, 0}, -6, "FG0"} /* clip2 */
}
};
static const GAIN_OPTIMIZATION_LADDER gainLadder5112 = {
8, /* numStepsInLadder */
1, /* defaultStepNum */
{ { {3, 0,0,0, 0,0,0}, 6, "FG7"}, /* most fixed gain */
{ {2, 0,0,0, 0,0,0}, 0, "FG6"},
{ {1, 0,0,0, 0,0,0}, -3, "FG5"},
{ {0, 0,0,0, 0,0,0}, -6, "FG4"},
{ {0, 1,1,0, 0,0,0}, -8, "FG3"},
{ {0, 1,1,0, 1,1,0}, -10, "FG2"},
{ {0, 1,0,1, 1,1,0}, -13, "FG1"},
{ {0, 1,0,1, 1,0,1}, -16, "FG0"}, /* least fixed gain */
}
};
/*
* Initialize the gain structure to good values
*/
void
ar5212InitializeGainValues(struct ath_hal *ah)
{
struct ath_hal_5212 *ahp = AH5212(ah);
GAIN_VALUES *gv = &ahp->ah_gainValues;
/* initialize gain optimization values */
if (IS_RAD5112_ANY(ah)) {
gv->currStepNum = gainLadder5112.defaultStepNum;
gv->currStep =
&gainLadder5112.optStep[gainLadder5112.defaultStepNum];
gv->active = AH_TRUE;
gv->loTrig = 20;
gv->hiTrig = 85;
} else {
gv->currStepNum = gainLadder.defaultStepNum;
gv->currStep = &gainLadder.optStep[gainLadder.defaultStepNum];
gv->active = AH_TRUE;
gv->loTrig = 20;
gv->hiTrig = 35;
}
}
#define MAX_ANALOG_START 319 /* XXX */
/*
* Find analog bits of given parameter data and return a reversed value
*/
static uint32_t
ar5212GetRfField(uint32_t *rfBuf, uint32_t numBits, uint32_t firstBit, uint32_t column)
{
uint32_t reg32 = 0, mask, arrayEntry, lastBit;
uint32_t bitPosition, bitsShifted;
int32_t bitsLeft;
HALASSERT(column <= 3);
HALASSERT(numBits <= 32);
HALASSERT(firstBit + numBits <= MAX_ANALOG_START);
arrayEntry = (firstBit - 1) / 8;
bitPosition = (firstBit - 1) % 8;
bitsLeft = numBits;
bitsShifted = 0;
while (bitsLeft > 0) {
lastBit = (bitPosition + bitsLeft > 8) ?
(8) : (bitPosition + bitsLeft);
mask = (((1 << lastBit) - 1) ^ ((1 << bitPosition) - 1)) <<
(column * 8);
reg32 |= (((rfBuf[arrayEntry] & mask) >> (column * 8)) >>
bitPosition) << bitsShifted;
bitsShifted += lastBit - bitPosition;
bitsLeft -= (8 - bitPosition);
bitPosition = 0;
arrayEntry++;
}
reg32 = ath_hal_reverseBits(reg32, numBits);
return reg32;
}
static HAL_BOOL
ar5212InvalidGainReadback(struct ath_hal *ah, GAIN_VALUES *gv)
{
uint32_t gStep, g, mixOvr;
uint32_t L1, L2, L3, L4;
if (IS_RAD5112_ANY(ah)) {
mixOvr = ar5212GetRfField(ar5212GetRfBank(ah, 7), 1, 36, 0);
L1 = 0;
L2 = 107;
L3 = 0;
L4 = 107;
if (mixOvr == 1) {
L2 = 83;
L4 = 83;
gv->hiTrig = 55;
}
} else {
gStep = ar5212GetRfField(ar5212GetRfBank(ah, 7), 6, 37, 0);
L1 = 0;
L2 = (gStep == 0x3f) ? 50 : gStep + 4;
L3 = (gStep != 0x3f) ? 0x40 : L1;
L4 = L3 + 50;
gv->loTrig = L1 + (gStep == 0x3f ? DYN_ADJ_LO_MARGIN : 0);
/* never adjust if != 0x3f */
gv->hiTrig = L4 - (gStep == 0x3f ? DYN_ADJ_UP_MARGIN : -5);
}
g = gv->currGain;
return !((g >= L1 && g<= L2) || (g >= L3 && g <= L4));
}
/*
* Enable the probe gain check on the next packet
*/
void
ar5212RequestRfgain(struct ath_hal *ah)
{
struct ath_hal_5212 *ahp = AH5212(ah);
uint32_t probePowerIndex;
/* Enable the gain readback probe */
probePowerIndex = ahp->ah_ofdmTxPower + ahp->ah_txPowerIndexOffset;
OS_REG_WRITE(ah, AR_PHY_PAPD_PROBE,
SM(probePowerIndex, AR_PHY_PAPD_PROBE_POWERTX)
| AR_PHY_PAPD_PROBE_NEXT_TX);
ahp->ah_rfgainState = HAL_RFGAIN_READ_REQUESTED;
}
/*
* Check to see if our readback gain level sits within the linear
* region of our current variable attenuation window
*/
static HAL_BOOL
ar5212IsGainAdjustNeeded(struct ath_hal *ah, const GAIN_VALUES *gv)
{
return (gv->currGain <= gv->loTrig || gv->currGain >= gv->hiTrig);
}
/*
* Move the rabbit ears in the correct direction.
*/
static int32_t
ar5212AdjustGain(struct ath_hal *ah, GAIN_VALUES *gv)
{
const GAIN_OPTIMIZATION_LADDER *gl;
if (IS_RAD5112_ANY(ah))
gl = &gainLadder5112;
else
gl = &gainLadder;
gv->currStep = &gl->optStep[gv->currStepNum];
if (gv->currGain >= gv->hiTrig) {
if (gv->currStepNum == 0) {
HALDEBUG(ah, HAL_DEBUG_ANY, "%s: Max gain limit.\n",
__func__);
return -1;
}
HALDEBUG(ah, HAL_DEBUG_RFPARAM,
"%s: Adding gain: currG=%d [%s] --> ",
__func__, gv->currGain, gv->currStep->stepName);
gv->targetGain = gv->currGain;
while (gv->targetGain >= gv->hiTrig && gv->currStepNum > 0) {
gv->targetGain -= 2 * (gl->optStep[--(gv->currStepNum)].stepGain -
gv->currStep->stepGain);
gv->currStep = &gl->optStep[gv->currStepNum];
}
HALDEBUG(ah, HAL_DEBUG_RFPARAM, "targG=%d [%s]\n",
gv->targetGain, gv->currStep->stepName);
return 1;
}
if (gv->currGain <= gv->loTrig) {
if (gv->currStepNum == gl->numStepsInLadder-1) {
HALDEBUG(ah, HAL_DEBUG_RFPARAM,
"%s: Min gain limit.\n", __func__);
return -2;
}
HALDEBUG(ah, HAL_DEBUG_RFPARAM,
"%s: Deducting gain: currG=%d [%s] --> ",
__func__, gv->currGain, gv->currStep->stepName);
gv->targetGain = gv->currGain;
while (gv->targetGain <= gv->loTrig &&
gv->currStepNum < (gl->numStepsInLadder - 1)) {
gv->targetGain -= 2 *
(gl->optStep[++(gv->currStepNum)].stepGain - gv->currStep->stepGain);
gv->currStep = &gl->optStep[gv->currStepNum];
}
HALDEBUG(ah, HAL_DEBUG_RFPARAM, "targG=%d [%s]\n",
gv->targetGain, gv->currStep->stepName);
return 2;
}
return 0; /* caller didn't call needAdjGain first */
}
/*
* Read rf register to determine if gainF needs correction
*/
static uint32_t
ar5212GetGainFCorrection(struct ath_hal *ah)
{
struct ath_hal_5212 *ahp = AH5212(ah);
uint32_t correction;
HALASSERT(IS_RADX112_REV2(ah));
correction = 0;
if (ar5212GetRfField(ar5212GetRfBank(ah, 7), 1, 36, 0) == 1) {
const GAIN_VALUES *gv = &ahp->ah_gainValues;
uint32_t mixGain = gv->currStep->paramVal[0];
uint32_t gainStep =
ar5212GetRfField(ar5212GetRfBank(ah, 7), 4, 32, 0);
switch (mixGain) {
case 0 :
correction = 0;
break;
case 1 :
correction = gainStep;
break;
case 2 :
correction = 2 * gainStep - 5;
break;
case 3 :
correction = 2 * gainStep;
break;
}
}
return correction;
}
/*
* Exported call to check for a recent gain reading and return
* the current state of the thermal calibration gain engine.
*/
HAL_RFGAIN
ar5212GetRfgain(struct ath_hal *ah)
{
struct ath_hal_5212 *ahp = AH5212(ah);
GAIN_VALUES *gv = &ahp->ah_gainValues;
uint32_t rddata, probeType;
/* NB: beware of touching the BB when PHY is powered down */
if (!gv->active || !ahp->ah_phyPowerOn)
return HAL_RFGAIN_INACTIVE;
if (ahp->ah_rfgainState == HAL_RFGAIN_READ_REQUESTED) {
/* Caller had asked to setup a new reading. Check it. */
rddata = OS_REG_READ(ah, AR_PHY_PAPD_PROBE);
if ((rddata & AR_PHY_PAPD_PROBE_NEXT_TX) == 0) {
/* bit got cleared, we have a new reading. */
gv->currGain = rddata >> AR_PHY_PAPD_PROBE_GAINF_S;
probeType = MS(rddata, AR_PHY_PAPD_PROBE_TYPE);
if (probeType == AR_PHY_PAPD_PROBE_TYPE_CCK) {
const HAL_EEPROM *ee = AH_PRIVATE(ah)->ah_eeprom;
HALASSERT(IS_RAD5112_ANY(ah));
HALASSERT(ah->ah_magic == AR5212_MAGIC);
if (AH_PRIVATE(ah)->ah_phyRev >= AR_PHY_CHIP_ID_REV_2)
gv->currGain += ee->ee_cckOfdmGainDelta;
else
gv->currGain += PHY_PROBE_CCK_CORRECTION;
}
if (IS_RADX112_REV2(ah)) {
uint32_t correct = ar5212GetGainFCorrection(ah);
if (gv->currGain >= correct)
gv->currGain -= correct;
else
gv->currGain = 0;
}
/* inactive by default */
ahp->ah_rfgainState = HAL_RFGAIN_INACTIVE;
if (!ar5212InvalidGainReadback(ah, gv) &&
ar5212IsGainAdjustNeeded(ah, gv) &&
ar5212AdjustGain(ah, gv) > 0) {
/*
* Change needed. Copy ladder info
* into eeprom info.
*/
ahp->ah_rfgainState = HAL_RFGAIN_NEED_CHANGE;
/* for ap51 */
ahp->ah_cwCalRequire = AH_TRUE;
/* Request IQ recalibration for temperature chang */
ahp->ah_bIQCalibration = IQ_CAL_INACTIVE;
}
}
}
return ahp->ah_rfgainState;
}