--- /dev/null
+/*
+ * Copyright (c) 2008-2011 Atheros Communications Inc.
+ *
+ * Modified for iPXE by Scott K Logan <logans@cottsay.net> July 2011
+ * Original from Linux kernel 3.0.1
+ *
+ * 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.
+ */
+
+#include "hw.h"
+#include "hw-ops.h"
+
+/* Common calibration code */
+
+#define ATH9K_NF_TOO_HIGH -60
+
+static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer)
+{
+ int16_t nfval;
+ int16_t sort[ATH9K_NF_CAL_HIST_MAX];
+ int i, j;
+
+ for (i = 0; i < ATH9K_NF_CAL_HIST_MAX; i++)
+ sort[i] = nfCalBuffer[i];
+
+ for (i = 0; i < ATH9K_NF_CAL_HIST_MAX - 1; i++) {
+ for (j = 1; j < ATH9K_NF_CAL_HIST_MAX - i; j++) {
+ if (sort[j] > sort[j - 1]) {
+ nfval = sort[j];
+ sort[j] = sort[j - 1];
+ sort[j - 1] = nfval;
+ }
+ }
+ }
+ nfval = sort[(ATH9K_NF_CAL_HIST_MAX - 1) >> 1];
+
+ return nfval;
+}
+
+static struct ath_nf_limits *ath9k_hw_get_nf_limits(struct ath_hw *ah,
+ struct ath9k_channel *chan)
+{
+ struct ath_nf_limits *limit;
+
+ if (!chan || IS_CHAN_2GHZ(chan))
+ limit = &ah->nf_2g;
+ else
+ limit = &ah->nf_5g;
+
+ return limit;
+}
+
+static s16 ath9k_hw_get_default_nf(struct ath_hw *ah,
+ struct ath9k_channel *chan)
+{
+ return ath9k_hw_get_nf_limits(ah, chan)->nominal;
+}
+
+
+static void ath9k_hw_update_nfcal_hist_buffer(struct ath_hw *ah,
+ struct ath9k_hw_cal_data *cal,
+ int16_t *nfarray)
+{
+ struct ath_nf_limits *limit;
+ struct ath9k_nfcal_hist *h;
+ int high_nf_mid = 0;
+ u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask;
+ int i;
+
+ h = cal->nfCalHist;
+ limit = ath9k_hw_get_nf_limits(ah, ah->curchan);
+
+ for (i = 0; i < NUM_NF_READINGS; i++) {
+ if (!(chainmask & (1 << i)) ||
+ (i >= AR5416_MAX_CHAINS))
+ continue;
+
+ h[i].nfCalBuffer[h[i].currIndex] = nfarray[i];
+
+ if (++h[i].currIndex >= ATH9K_NF_CAL_HIST_MAX)
+ h[i].currIndex = 0;
+
+ if (h[i].invalidNFcount > 0) {
+ h[i].invalidNFcount--;
+ h[i].privNF = nfarray[i];
+ } else {
+ h[i].privNF =
+ ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer);
+ }
+
+ if (!h[i].privNF)
+ continue;
+
+ if (h[i].privNF > limit->max) {
+ high_nf_mid = 1;
+
+ DBG2("ath9k: "
+ "NFmid[%d] (%d) > MAX (%d), %s\n",
+ i, h[i].privNF, limit->max,
+ (cal->nfcal_interference ?
+ "not corrected (due to interference)" :
+ "correcting to MAX"));
+
+ /*
+ * Normally we limit the average noise floor by the
+ * hardware specific maximum here. However if we have
+ * encountered stuck beacons because of interference,
+ * we bypass this limit here in order to better deal
+ * with our environment.
+ */
+ if (!cal->nfcal_interference)
+ h[i].privNF = limit->max;
+ }
+ }
+
+ /*
+ * If the noise floor seems normal for all chains, assume that
+ * there is no significant interference in the environment anymore.
+ * Re-enable the enforcement of the NF maximum again.
+ */
+ if (!high_nf_mid)
+ cal->nfcal_interference = 0;
+}
+
+static int ath9k_hw_get_nf_thresh(struct ath_hw *ah,
+ int band,
+ int16_t *nft)
+{
+ switch (band) {
+ case NET80211_BAND_5GHZ:
+ *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_5);
+ break;
+ case NET80211_BAND_2GHZ:
+ *nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_2);
+ break;
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+void ath9k_hw_reset_calibration(struct ath_hw *ah,
+ struct ath9k_cal_list *currCal)
+{
+ int i;
+
+ ath9k_hw_setup_calibration(ah, currCal);
+
+ currCal->calState = CAL_RUNNING;
+
+ for (i = 0; i < AR5416_MAX_CHAINS; i++) {
+ ah->meas0.sign[i] = 0;
+ ah->meas1.sign[i] = 0;
+ ah->meas2.sign[i] = 0;
+ ah->meas3.sign[i] = 0;
+ }
+
+ ah->cal_samples = 0;
+}
+
+/* This is done for the currently configured channel */
+int ath9k_hw_reset_calvalid(struct ath_hw *ah)
+{
+ struct ath9k_cal_list *currCal = ah->cal_list_curr;
+
+ if (!ah->caldata)
+ return 1;
+
+ if (!AR_SREV_9100(ah) && !AR_SREV_9160_10_OR_LATER(ah))
+ return 1;
+
+ if (currCal == NULL)
+ return 1;
+
+ if (currCal->calState != CAL_DONE) {
+ DBG("ath9k: "
+ "Calibration state incorrect, %d\n",
+ currCal->calState);
+ return 1;
+ }
+
+ if (!(ah->supp_cals & currCal->calData->calType))
+ return 1;
+
+ DBG("ath9k: "
+ "Resetting Cal %d state for channel %d\n",
+ currCal->calData->calType, (ah->dev->channels + ah->dev->channel)->center_freq);
+
+ ah->caldata->CalValid &= ~currCal->calData->calType;
+ currCal->calState = CAL_WAITING;
+
+ return 0;
+}
+
+void ath9k_hw_start_nfcal(struct ath_hw *ah, int update)
+{
+ if (ah->caldata)
+ ah->caldata->nfcal_pending = 1;
+
+ REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
+ AR_PHY_AGC_CONTROL_ENABLE_NF);
+
+ if (update)
+ REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
+ AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
+ else
+ REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
+ AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
+
+ REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
+}
+
+void ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
+{
+ struct ath9k_nfcal_hist *h = NULL;
+ unsigned i, j;
+ int32_t val;
+ u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask;
+ s16 default_nf = ath9k_hw_get_default_nf(ah, chan);
+
+ if (ah->caldata)
+ h = ah->caldata->nfCalHist;
+
+ for (i = 0; i < NUM_NF_READINGS; i++) {
+ if (chainmask & (1 << i)) {
+ s16 nfval;
+
+ if (i >= AR5416_MAX_CHAINS)
+ continue;
+
+ if (h)
+ nfval = h[i].privNF;
+ else
+ nfval = default_nf;
+
+ val = REG_READ(ah, ah->nf_regs[i]);
+ val &= 0xFFFFFE00;
+ val |= (((u32) nfval << 1) & 0x1ff);
+ REG_WRITE(ah, ah->nf_regs[i], val);
+ }
+ }
+
+ /*
+ * Load software filtered NF value into baseband internal minCCApwr
+ * variable.
+ */
+ REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
+ AR_PHY_AGC_CONTROL_ENABLE_NF);
+ REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
+ AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
+ 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.
+ * The max delay was changed from an original 250us to 10000us
+ * since 250us often results in NF load timeout and causes deaf
+ * condition during stress testing 12/12/2009
+ */
+ for (j = 0; j < 10000; j++) {
+ if ((REG_READ(ah, AR_PHY_AGC_CONTROL) &
+ AR_PHY_AGC_CONTROL_NF) == 0)
+ break;
+ udelay(10);
+ }
+
+ /*
+ * We timed out waiting for the noisefloor to load, probably due to an
+ * in-progress rx. Simply return here and allow the load plenty of time
+ * to complete before the next calibration interval. We need to avoid
+ * trying to load -50 (which happens below) while the previous load is
+ * still in progress as this can cause rx deafness. Instead by returning
+ * here, the baseband nf cal will just be capped by our present
+ * noisefloor until the next calibration timer.
+ */
+ if (j == 10000) {
+ DBG("ath9k: "
+ "Timeout while waiting for nf to load: AR_PHY_AGC_CONTROL=0x%x\n",
+ REG_READ(ah, AR_PHY_AGC_CONTROL));
+ return;
+ }
+
+ /*
+ * 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.
+ */
+ ENABLE_REGWRITE_BUFFER(ah);
+ for (i = 0; i < NUM_NF_READINGS; i++) {
+ if (chainmask & (1 << i)) {
+ if (i >= AR5416_MAX_CHAINS)
+ continue;
+
+ val = REG_READ(ah, ah->nf_regs[i]);
+ val &= 0xFFFFFE00;
+ val |= (((u32) (-50) << 1) & 0x1ff);
+ REG_WRITE(ah, ah->nf_regs[i], val);
+ }
+ }
+ REGWRITE_BUFFER_FLUSH(ah);
+}
+
+
+static void ath9k_hw_nf_sanitize(struct ath_hw *ah, s16 *nf)
+{
+ struct ath_nf_limits *limit;
+ int i;
+
+ if (IS_CHAN_2GHZ(ah->curchan))
+ limit = &ah->nf_2g;
+ else
+ limit = &ah->nf_5g;
+
+ for (i = 0; i < NUM_NF_READINGS; i++) {
+ if (!nf[i])
+ continue;
+
+ DBG2("ath9k: "
+ "NF calibrated [%s] [chain %d] is %d\n",
+ (i >= 3 ? "ext" : "ctl"), i % 3, nf[i]);
+
+ if (nf[i] > ATH9K_NF_TOO_HIGH) {
+ DBG("ath9k: "
+ "NF[%d] (%d) > MAX (%d), correcting to MAX\n",
+ i, nf[i], ATH9K_NF_TOO_HIGH);
+ nf[i] = limit->max;
+ } else if (nf[i] < limit->min) {
+ DBG("ath9k: "
+ "NF[%d] (%d) < MIN (%d), correcting to NOM\n",
+ i, nf[i], limit->min);
+ nf[i] = limit->nominal;
+ }
+ }
+}
+
+int ath9k_hw_getnf(struct ath_hw *ah, struct ath9k_channel *chan)
+{
+ int16_t nf, nfThresh;
+ int16_t nfarray[NUM_NF_READINGS] = { 0 };
+ struct ath9k_nfcal_hist *h;
+ struct net80211_channel *c = chan->chan;
+ struct ath9k_hw_cal_data *caldata = ah->caldata;
+
+ chan->channelFlags &= (~CHANNEL_CW_INT);
+ if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) {
+ DBG("ath9k: "
+ "NF did not complete in calibration window\n");
+ return 0;
+ }
+
+ ath9k_hw_do_getnf(ah, nfarray);
+ ath9k_hw_nf_sanitize(ah, nfarray);
+ nf = nfarray[0];
+ if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh)
+ && nf > nfThresh) {
+ DBG2("ath9k: "
+ "noise floor failed detected; detected %d, threshold %d\n",
+ nf, nfThresh);
+ chan->channelFlags |= CHANNEL_CW_INT;
+ }
+
+ if (!caldata) {
+ chan->noisefloor = nf;
+ return 0;
+ }
+
+ h = caldata->nfCalHist;
+ caldata->nfcal_pending = 0;
+ ath9k_hw_update_nfcal_hist_buffer(ah, caldata, nfarray);
+ chan->noisefloor = h[0].privNF;
+ return 1;
+}
+
+void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah,
+ struct ath9k_channel *chan)
+{
+ struct ath9k_nfcal_hist *h;
+ s16 default_nf;
+ int i, j;
+
+ ah->caldata->channel = chan->channel;
+ ah->caldata->channelFlags = chan->channelFlags & ~CHANNEL_CW_INT;
+ h = ah->caldata->nfCalHist;
+ default_nf = ath9k_hw_get_default_nf(ah, chan);
+ for (i = 0; i < NUM_NF_READINGS; i++) {
+ h[i].currIndex = 0;
+ h[i].privNF = default_nf;
+ h[i].invalidNFcount = AR_PHY_CCA_FILTERWINDOW_LENGTH;
+ for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) {
+ h[i].nfCalBuffer[j] = default_nf;
+ }
+ }
+}
Code Review / kvmfornfv.git / blobdiff