ar5416_cal.c

最新之atheros芯片driver source code, 基于linux操作系统,內含atheros芯片HAL全部代码

	struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;

	/* Cal is assumed not done until explicitly set below */
	*isCalDone = AH_FALSE;

	HALDEBUG(ah, HAL_DEBUG_PERCAL,
	    "%s: %s Calibration, state %d, calValid 0x%x\n",
	    __func__, currCal->calData->calName, currCal->calState,
	    ichan->calValid);

	/* Calibration in progress. */
	if (currCal->calState == CAL_RUNNING) {
		/* Check to see if it has finished. */
		if (!(OS_REG_READ(ah, AR_PHY_TIMING_CTRL4) & AR_PHY_TIMING_CTRL4_DO_CAL)) {
			HALDEBUG(ah, HAL_DEBUG_PERCAL,
			    "%s: sample %d of %d finished\n",
			    __func__, cal->calSamples,
			    currCal->calData->calNumSamples);
			/* 
			 * Collect measurements for active chains.
			 */
			currCal->calData->calCollect(ah);
			if (++cal->calSamples >= currCal->calData->calNumSamples) {
				int i, numChains = 0;
				for (i = 0; i < AR5416_MAX_CHAINS; i++) {
					if (rxchainmask & (1 << i))
						numChains++;
				}
				/* 
				 * Process accumulated data
				 */
				currCal->calData->calPostProc(ah, numChains);

				/* Calibration has finished. */
				ichan->calValid |= currCal->calData->calType;
				currCal->calState = CAL_DONE;
				*isCalDone = AH_TRUE;
			} else {
				/*
				 * Set-up to collect of another sub-sample.
				 */
				ar5416SetupMeasurement(ah, currCal);
			}
		}
	} else if (!(ichan->calValid & currCal->calData->calType)) {
		/* If current cal is marked invalid in channel, kick it off */
		ar5416ResetMeasurement(ah, currCal);
	}
}

/*
 * Internal interface to schedule periodic calibration work.
 */
HAL_BOOL
ar5416PerCalibrationN(struct ath_hal *ah,  HAL_CHANNEL *chan,
	u_int rxchainmask, HAL_BOOL longcal, HAL_BOOL *isCalDone)
{
	struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
	HAL_CAL_LIST *currCal = cal->cal_curr;
	HAL_CHANNEL_INTERNAL *ichan;

	OS_MARK(ah, AH_MARK_PERCAL, chan->channel);

	*isCalDone = AH_TRUE;

	/* Invalid channel check */
	ichan = ath_hal_checkchannel(ah, chan);
	if (ichan == AH_NULL) {
		HALDEBUG(ah, HAL_DEBUG_ANY,
		    "%s: invalid channel %u/0x%x; no mapping\n",
		    __func__, chan->channel, chan->channelFlags);
		return AH_FALSE;
	}

	/*
	 * For given calibration:
	 * 1. Call generic cal routine
	 * 2. When this cal is done (isCalDone) if we have more cals waiting
	 *    (eg after reset), mask this to upper layers by not propagating
	 *    isCalDone if it is set to TRUE.
	 *    Instead, change isCalDone to FALSE and setup the waiting cal(s)
	 *    to be run.
	 */
	if (currCal != AH_NULL &&
	    (currCal->calState == CAL_RUNNING ||
	     currCal->calState == CAL_WAITING)) {
		ar5416DoCalibration(ah, ichan, rxchainmask, currCal, isCalDone);
		if (*isCalDone == AH_TRUE) {
			cal->cal_curr = currCal = currCal->calNext;
			if (currCal->calState == CAL_WAITING) {
				*isCalDone = AH_FALSE;
				ar5416ResetMeasurement(ah, currCal);
			}
		}
	}

	/* Do NF cal only at longer intervals */
	if (longcal) {
		/*
		 * Get the value from the previous NF cal
		 * and update the history buffer.
		 */
		ar5416GetNf(ah, ichan);

		/* 
		 * Load the NF from history buffer of the current channel.
		 * NF is slow time-variant, so it is OK to use a
		 * historical value.
		 */
		ar5416LoadNF(ah, AH_PRIVATE(ah)->ah_curchan);

		/* start NF calibration, without updating BB NF register*/
		ar5416StartNFCal(ah);

		if ((ichan->channelFlags & CHANNEL_CW_INT) != 0) {
			/* report up and clear internal state */
			chan->channelFlags |= CHANNEL_CW_INT;
			ichan->channelFlags &= ~CHANNEL_CW_INT;
		}
	}
	return AH_TRUE;
}

/*
 * Recalibrate the lower PHY chips to account for temperature/environment
 * changes.
 */
HAL_BOOL
ar5416PerCalibration(struct ath_hal *ah,  HAL_CHANNEL *chan, HAL_BOOL *isIQdone)
{
	struct ath_hal_5416 *ahp = AH5416(ah);
	struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
	HAL_CAL_LIST *curCal = cal->cal_curr;

	if (curCal != AH_NULL && curCal->calData->calType == IQ_MISMATCH_CAL) {
		return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask,
		    AH_TRUE, isIQdone);
	} else {
		HAL_BOOL isCalDone;

		*isIQdone = AH_FALSE;
		return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask,
		    AH_TRUE, &isCalDone);
	}
}

static HAL_BOOL
ar5416GetEepromNoiseFloorThresh(struct ath_hal *ah,
	const HAL_CHANNEL_INTERNAL *chan, int16_t *nft)
{
	switch (chan->channelFlags & CHANNEL_ALL_NOTURBO) {
	case CHANNEL_A:
	case CHANNEL_A_HT20:
	case CHANNEL_A_HT40PLUS:
	case CHANNEL_A_HT40MINUS:
		ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_5, nft);
		break;
	case CHANNEL_B:
	case CHANNEL_G:
	case CHANNEL_G_HT20:
	case CHANNEL_G_HT40PLUS:
	case CHANNEL_G_HT40MINUS:
		ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_2, nft);
		break;
	default:
		HALDEBUG(ah, HAL_DEBUG_ANY,
		    "%s: invalid channel flags 0x%x\n",
		    __func__, chan->channelFlags);
		return AH_FALSE;
	}
	return AH_TRUE;
}

static void
ar5416StartNFCal(struct ath_hal *ah)
{
	OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF);
	OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
	OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
}

static void
ar5416LoadNF(struct ath_hal *ah, HAL_CHANNEL_INTERNAL *chan)
{
	static const uint32_t ar5416_cca_regs[] = {
		AR_PHY_CCA,
		AR_PHY_CH1_CCA,
		AR_PHY_CH2_CCA,
		AR_PHY_EXT_CCA,
		AR_PHY_CH1_EXT_CCA,
		AR_PHY_CH2_EXT_CCA
	};
	struct ar5212NfCalHist *h;
	int i, j;
	int32_t val;
	uint8_t chainmask;

	/*
	 * Force NF calibration for all chains.
	 */
	if (AR_SREV_KITE(ah)) {
		/* Kite has only one chain */
		chainmask = 0x9;
	} else if (AR_SREV_MERLIN(ah)) {
		/* Merlin has only two chains */
		chainmask = 0x1B;
	} else {
		chainmask = 0x3F;
	}

	/*
	 * Write filtered NF values into maxCCApwr register parameter
	 * so we can load below.
	 */
	h = AH5416(ah)->ah_cal.nfCalHist;
	for (i = 0; i < AR5416_NUM_NF_READINGS; i ++)
		if (chainmask & (1 << i)) { 
			val = OS_REG_READ(ah, ar5416_cca_regs[i]);
			val &= 0xFFFFFE00;
			val |= (((uint32_t)(h[i].privNF) << 1) & 0x1ff);
			OS_REG_WRITE(ah, ar5416_cca_regs[i], val);
		}

	/* Load software filtered NF value into baseband internal minCCApwr variable. */
	OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF);
	OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
	OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);

	/* Wait for load to complete, should be fast, a few 10s of us. */
	for (j = 0; j < 1000; j++) {
		if ((OS_REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) == 0)
			break;
		OS_DELAY(10);
	}

	/*
	 * Restore maxCCAPower register parameter again so that we're not capped
	 * by the median we just loaded.  This will be initial (and max) value
	 * of next noise floor calibration the baseband does.  
	 */
	for (i = 0; i < AR5416_NUM_NF_READINGS; i ++)
		if (chainmask & (1 << i)) {	
			val = OS_REG_READ(ah, ar5416_cca_regs[i]);
			val &= 0xFFFFFE00;
			val |= (((uint32_t)(-50) << 1) & 0x1ff);
			OS_REG_WRITE(ah, ar5416_cca_regs[i], val);
		}
}

void
ar5416InitNfHistBuff(struct ar5212NfCalHist *h)
{
	int i, j;

	for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) {
		h[i].currIndex = 0;
		h[i].privNF = AR5416_CCA_MAX_GOOD_VALUE;
		h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX;
		for (j = 0; j < AR512_NF_CAL_HIST_MAX; j ++)
			h[i].nfCalBuffer[j] = AR5416_CCA_MAX_GOOD_VALUE;
	}
}

/*
 * Update the noise floor buffer as a ring buffer
 */
static void
ar5416UpdateNFHistBuff(struct ar5212NfCalHist *h, int16_t *nfarray)
{
	int i;

	for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) {
		h[i].nfCalBuffer[h[i].currIndex] = nfarray[i];

		if (++h[i].currIndex >= AR512_NF_CAL_HIST_MAX)
			h[i].currIndex = 0;
		if (h[i].invalidNFcount > 0) {
			if (nfarray[i] < AR5416_CCA_MIN_BAD_VALUE ||
			    nfarray[i] > AR5416_CCA_MAX_HIGH_VALUE) {
				h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX;
			} else {
				h[i].invalidNFcount--;
				h[i].privNF = nfarray[i];
			}
		} else {
			h[i].privNF = ar5212GetNfHistMid(h[i].nfCalBuffer);
		}
	}
}   

/*
 * Read the NF and check it against the noise floor threshhold
 */
static int16_t
ar5416GetNf(struct ath_hal *ah, HAL_CHANNEL_INTERNAL *chan)
{
	int16_t nf, nfThresh;

	if (OS_REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) {
		HALDEBUG(ah, HAL_DEBUG_ANY,
		    "%s: NF didn't complete in calibration window\n", __func__);
		nf = 0;
	} else {
		/* Finished NF cal, check against threshold */
		int16_t nfarray[NUM_NOISEFLOOR_READINGS] = { 0 };
			
		/* TODO - enhance for multiple chains and ext ch */
		ath_hal_getNoiseFloor(ah, nfarray);
		nf = nfarray[0];
		if (ar5416GetEepromNoiseFloorThresh(ah, chan, &nfThresh)) {
			if (nf > nfThresh) {
				HALDEBUG(ah, HAL_DEBUG_ANY,
				    "%s: noise floor failed detected; "
				    "detected %d, threshold %d\n", __func__,
				    nf, nfThresh);
				/*
				 * NB: Don't discriminate 2.4 vs 5Ghz, if this
				 *     happens it indicates a problem regardless
				 *     of the band.
				 */
				chan->channelFlags |= CHANNEL_CW_INT;
				nf = 0;
			}
		} else {
			nf = 0;
		}
		ar5416UpdateNFHistBuff(AH5416(ah)->ah_cal.nfCalHist, nfarray);
		chan->rawNoiseFloor = nf;
	}
	return nf;
}