[net-next-2.6.git] / drivers / net / wireless / ath / ath9k / calib.c

/*
 * Copyright (c) 2008-2009 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.
 */

#include "hw.h"
#include "hw-ops.h"

/* Common calibration code */

/* We can tune this as we go by monitoring really low values */
#define ATH9K_NF_TOO_LOW	-60

/* AR5416 may return very high value (like -31 dBm), in those cases the nf
 * is incorrect and we should use the static NF value. Later we can try to
 * find out why they are reporting these values */

static bool ath9k_hw_nf_in_range(struct ath_hw *ah, s16 nf)
{
	if (nf > ATH9K_NF_TOO_LOW) {
		ath_print(ath9k_hw_common(ah), ATH_DBG_CALIBRATE,
			  "noise floor value detected (%d) is "
			  "lower than what we think is a "
			  "reasonable value (%d)\n",
			  nf, ATH9K_NF_TOO_LOW);
		return false;
	}
	return true;
}

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 void ath9k_hw_update_nfcal_hist_buffer(struct ath9k_nfcal_hist *h,
					      int16_t *nfarray)
{
	int i;

	for (i = 0; i < NUM_NF_READINGS; i++) {
		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) {
			if (nfarray[i] < AR_PHY_CCA_MIN_BAD_VALUE ||
			    nfarray[i] > AR_PHY_CCA_MAX_HIGH_VALUE) {
				h[i].invalidNFcount = ATH9K_NF_CAL_HIST_MAX;
			} else {
				h[i].invalidNFcount--;
				h[i].privNF = nfarray[i];
			}
		} else {
			h[i].privNF =
				ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer);
		}
	}
	return;
}

static bool ath9k_hw_get_nf_thresh(struct ath_hw *ah,
				   enum ieee80211_band band,
				   int16_t *nft)
{
	switch (band) {
	case IEEE80211_BAND_5GHZ:
		*nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_5);
		break;
	case IEEE80211_BAND_2GHZ:
		*nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_2);
		break;
	default:
		BUG_ON(1);
		return false;
	}

	return true;
}

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 */
bool ath9k_hw_reset_calvalid(struct ath_hw *ah)
{
	struct ath_common *common = ath9k_hw_common(ah);
	struct ieee80211_conf *conf = &common->hw->conf;
	struct ath9k_cal_list *currCal = ah->cal_list_curr;

	if (!ah->curchan)
		return true;

	if (!AR_SREV_9100(ah) && !AR_SREV_9160_10_OR_LATER(ah))
		return true;

	if (currCal == NULL)
		return true;

	if (currCal->calState != CAL_DONE) {
		ath_print(common, ATH_DBG_CALIBRATE,
			  "Calibration state incorrect, %d\n",
			  currCal->calState);
		return true;
	}

	if (!ath9k_hw_iscal_supported(ah, currCal->calData->calType))
		return true;

	ath_print(common, ATH_DBG_CALIBRATE,
		  "Resetting Cal %d state for channel %u\n",
		  currCal->calData->calType, conf->channel->center_freq);

	ah->curchan->CalValid &= ~currCal->calData->calType;
	currCal->calState = CAL_WAITING;

	return false;
}
EXPORT_SYMBOL(ath9k_hw_reset_calvalid);

void ath9k_hw_start_nfcal(struct ath_hw *ah)
{
	REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
		    AR_PHY_AGC_CONTROL_ENABLE_NF);
	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);
}

int16_t ath9k_hw_getnf(struct ath_hw *ah,
		       struct ath9k_channel *chan)
{
	struct ath_common *common = ath9k_hw_common(ah);
	int16_t nf, nfThresh;
	int16_t nfarray[NUM_NF_READINGS] = { 0 };
	struct ath9k_nfcal_hist *h;
	struct ieee80211_channel *c = chan->chan;

	chan->channelFlags &= (~CHANNEL_CW_INT);
	if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) {
		ath_print(common, ATH_DBG_CALIBRATE,
			  "NF did not complete in calibration window\n");
		nf = 0;
		chan->rawNoiseFloor = nf;
		return chan->rawNoiseFloor;
	} else {
		ath9k_hw_do_getnf(ah, nfarray);
		nf = nfarray[0];
		if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh)
		    && nf > nfThresh) {
			ath_print(common, ATH_DBG_CALIBRATE,
				  "noise floor failed detected; "
				  "detected %d, threshold %d\n",
				  nf, nfThresh);
			chan->channelFlags |= CHANNEL_CW_INT;
		}
	}

	h = ah->nfCalHist;

	ath9k_hw_update_nfcal_hist_buffer(h, nfarray);
	chan->rawNoiseFloor = h[0].privNF;

	return chan->rawNoiseFloor;
}

void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah)
{
	int i, j;
	s16 noise_floor;

	if (AR_SREV_9280(ah))
		noise_floor = AR_PHY_CCA_MAX_AR9280_GOOD_VALUE;
	else if (AR_SREV_9285(ah) || AR_SREV_9271(ah))
		noise_floor = AR_PHY_CCA_MAX_AR9285_GOOD_VALUE;
	else if (AR_SREV_9287(ah))
		noise_floor = AR_PHY_CCA_MAX_AR9287_GOOD_VALUE;
	else
		noise_floor = AR_PHY_CCA_MAX_AR5416_GOOD_VALUE;

	for (i = 0; i < NUM_NF_READINGS; i++) {
		ah->nfCalHist[i].currIndex = 0;
		ah->nfCalHist[i].privNF = noise_floor;
		ah->nfCalHist[i].invalidNFcount =
			AR_PHY_CCA_FILTERWINDOW_LENGTH;
		for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) {
			ah->nfCalHist[i].nfCalBuffer[j] = noise_floor;
		}
	}
}

s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan)
{
	s16 nf;

	if (chan->rawNoiseFloor == 0)
		nf = -96;
	else
		nf = chan->rawNoiseFloor;

	if (!ath9k_hw_nf_in_range(ah, nf))
		nf = ATH_DEFAULT_NOISE_FLOOR;

	return nf;
}
EXPORT_SYMBOL(ath9k_hw_getchan_noise);
Commit	Line	Data
f1dc5600	1	/*
cee075a2	2	* Copyright (c) 2008-2009 Atheros Communications Inc.
f1dc5600 S	3	*
	4	* Permission to use, copy, modify, and/or distribute this software for any
	5	* purpose with or without fee is hereby granted, provided that the above
	6	* copyright notice and this permission notice appear in all copies.
	7	*
	8	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	9	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	10	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	11	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	12	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	13	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	14	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	15	*/
	16
c46917bb	17	#include "hw.h"
641d9921	18	#include "hw-ops.h"
f1dc5600	19
795f5e2c LR	20	/* Common calibration code */
795f5e2c LR	21
f1dc5600 S	22	/* We can tune this as we go by monitoring really low values */
	23	#define ATH9K_NF_TOO_LOW -60
	24
	25	/* AR5416 may return very high value (like -31 dBm), in those cases the nf
	26	* is incorrect and we should use the static NF value. Later we can try to
	27	* find out why they are reporting these values */
	28
cbe61d8a	29	static bool ath9k_hw_nf_in_range(struct ath_hw *ah, s16 nf)
f1dc5600 S	30	{
f1dc5600 S	31	if (nf > ATH9K_NF_TOO_LOW) {
c46917bb LR	32	ath_print(ath9k_hw_common(ah), ATH_DBG_CALIBRATE,
	33	"noise floor value detected (%d) is "
	34	"lower than what we think is a "
	35	"reasonable value (%d)\n",
	36	nf, ATH9K_NF_TOO_LOW);
f1dc5600 S	37	return false;
	38	}
	39	return true;
	40	}
	41
	42	static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer)
	43	{
	44	int16_t nfval;
	45	int16_t sort[ATH9K_NF_CAL_HIST_MAX];
	46	int i, j;
	47
	48	for (i = 0; i < ATH9K_NF_CAL_HIST_MAX; i++)
	49	sort[i] = nfCalBuffer[i];
	50
	51	for (i = 0; i < ATH9K_NF_CAL_HIST_MAX - 1; i++) {
	52	for (j = 1; j < ATH9K_NF_CAL_HIST_MAX - i; j++) {
	53	if (sort[j] > sort[j - 1]) {
	54	nfval = sort[j];
	55	sort[j] = sort[j - 1];
	56	sort[j - 1] = nfval;
	57	}
	58	}
	59	}
	60	nfval = sort[(ATH9K_NF_CAL_HIST_MAX - 1) >> 1];
	61
	62	return nfval;
	63	}
	64
	65	static void ath9k_hw_update_nfcal_hist_buffer(struct ath9k_nfcal_hist *h,
	66	int16_t *nfarray)
	67	{
	68	int i;
	69
	70	for (i = 0; i < NUM_NF_READINGS; i++) {
	71	h[i].nfCalBuffer[h[i].currIndex] = nfarray[i];
	72
	73	if (++h[i].currIndex >= ATH9K_NF_CAL_HIST_MAX)
	74	h[i].currIndex = 0;
	75
	76	if (h[i].invalidNFcount > 0) {
	77	if (nfarray[i] < AR_PHY_CCA_MIN_BAD_VALUE \|\|
	78	nfarray[i] > AR_PHY_CCA_MAX_HIGH_VALUE) {
	79	h[i].invalidNFcount = ATH9K_NF_CAL_HIST_MAX;
	80	} else {
	81	h[i].invalidNFcount--;
	82	h[i].privNF = nfarray[i];
	83	}
	84	} else {
	85	h[i].privNF =
	86	ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer);
	87	}
	88	}
	89	return;
	90	}
	91
b43d59fb LR	92	static bool ath9k_hw_get_nf_thresh(struct ath_hw *ah,
	93	enum ieee80211_band band,
	94	int16_t *nft)
f1dc5600	95	{
76061abb LR	96	switch (band) {
76061abb LR	97	case IEEE80211_BAND_5GHZ:
f74df6fb	98	*nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_5);
f1dc5600	99	break;
76061abb	100	case IEEE80211_BAND_2GHZ:
f74df6fb	101	*nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_2);
f1dc5600 S	102	break;
f1dc5600 S	103	default:
76061abb	104	BUG_ON(1);
f1dc5600 S	105	return false;
	106	}
	107
	108	return true;
	109	}
	110
795f5e2c LR	111	void ath9k_hw_reset_calibration(struct ath_hw *ah,
795f5e2c LR	112	struct ath9k_cal_list *currCal)
f1dc5600	113	{
f1dc5600 S	114	int i;
	115
	116	ath9k_hw_setup_calibration(ah, currCal);
	117
	118	currCal->calState = CAL_RUNNING;
	119
	120	for (i = 0; i < AR5416_MAX_CHAINS; i++) {
2660b81a S	121	ah->meas0.sign[i] = 0;
	122	ah->meas1.sign[i] = 0;
	123	ah->meas2.sign[i] = 0;
	124	ah->meas3.sign[i] = 0;
f1dc5600 S	125	}
f1dc5600 S	126
2660b81a	127	ah->cal_samples = 0;
f1dc5600 S	128	}
f1dc5600 S	129
c9e27d94	130	/* This is done for the currently configured channel */
cbe61d8a	131	bool ath9k_hw_reset_calvalid(struct ath_hw *ah)
f1dc5600	132	{
c46917bb LR	133	struct ath_common *common = ath9k_hw_common(ah);
c46917bb LR	134	struct ieee80211_conf *conf = &common->hw->conf;
cbfe9468	135	struct ath9k_cal_list *currCal = ah->cal_list_curr;
f1dc5600	136
2660b81a	137	if (!ah->curchan)
c9e27d94	138	return true;
f1dc5600 S	139
f1dc5600 S	140	if (!AR_SREV_9100(ah) && !AR_SREV_9160_10_OR_LATER(ah))
c9e27d94	141	return true;
f1dc5600 S	142
f1dc5600 S	143	if (currCal == NULL)
c9e27d94	144	return true;
f1dc5600 S	145
f1dc5600 S	146	if (currCal->calState != CAL_DONE) {
c46917bb LR	147	ath_print(common, ATH_DBG_CALIBRATE,
	148	"Calibration state incorrect, %d\n",
	149	currCal->calState);
c9e27d94	150	return true;
f1dc5600 S	151	}
f1dc5600 S	152
c9e27d94 LR	153	if (!ath9k_hw_iscal_supported(ah, currCal->calData->calType))
c9e27d94 LR	154	return true;
f1dc5600	155
c46917bb LR	156	ath_print(common, ATH_DBG_CALIBRATE,
	157	"Resetting Cal %d state for channel %u\n",
	158	currCal->calData->calType, conf->channel->center_freq);
f1dc5600	159
2660b81a	160	ah->curchan->CalValid &= ~currCal->calData->calType;
f1dc5600 S	161	currCal->calState = CAL_WAITING;
f1dc5600 S	162
c9e27d94	163	return false;
f1dc5600	164	}
7322fd19	165	EXPORT_SYMBOL(ath9k_hw_reset_calvalid);
f1dc5600	166
cbe61d8a	167	void ath9k_hw_start_nfcal(struct ath_hw *ah)
f1dc5600 S	168	{
	169	REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
	170	AR_PHY_AGC_CONTROL_ENABLE_NF);
	171	REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
	172	AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
	173	REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
	174	}
	175
cbe61d8a	176	int16_t ath9k_hw_getnf(struct ath_hw *ah,
f1dc5600 S	177	struct ath9k_channel *chan)
f1dc5600 S	178	{
c46917bb	179	struct ath_common *common = ath9k_hw_common(ah);
f1dc5600 S	180	int16_t nf, nfThresh;
	181	int16_t nfarray[NUM_NF_READINGS] = { 0 };
	182	struct ath9k_nfcal_hist *h;
76061abb	183	struct ieee80211_channel *c = chan->chan;
f1dc5600 S	184
	185	chan->channelFlags &= (~CHANNEL_CW_INT);
	186	if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) {
c46917bb LR	187	ath_print(common, ATH_DBG_CALIBRATE,
c46917bb LR	188	"NF did not complete in calibration window\n");
f1dc5600 S	189	nf = 0;
	190	chan->rawNoiseFloor = nf;
	191	return chan->rawNoiseFloor;
	192	} else {
	193	ath9k_hw_do_getnf(ah, nfarray);
	194	nf = nfarray[0];
b43d59fb	195	if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh)
f1dc5600	196	&& nf > nfThresh) {
c46917bb LR	197	ath_print(common, ATH_DBG_CALIBRATE,
	198	"noise floor failed detected; "
	199	"detected %d, threshold %d\n",
	200	nf, nfThresh);
f1dc5600 S	201	chan->channelFlags \|= CHANNEL_CW_INT;
	202	}
	203	}
	204
f1dc5600	205	h = ah->nfCalHist;
f1dc5600 S	206
	207	ath9k_hw_update_nfcal_hist_buffer(h, nfarray);
	208	chan->rawNoiseFloor = h[0].privNF;
	209
	210	return chan->rawNoiseFloor;
	211	}
	212
cbe61d8a	213	void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah)
f1dc5600 S	214	{
f1dc5600 S	215	int i, j;
a59b5a5e SB	216	s16 noise_floor;
	217
	218	if (AR_SREV_9280(ah))
	219	noise_floor = AR_PHY_CCA_MAX_AR9280_GOOD_VALUE;
6398dc03	220	else if (AR_SREV_9285(ah) \|\| AR_SREV_9271(ah))
a59b5a5e	221	noise_floor = AR_PHY_CCA_MAX_AR9285_GOOD_VALUE;
6170cd5c VN	222	else if (AR_SREV_9287(ah))
6170cd5c VN	223	noise_floor = AR_PHY_CCA_MAX_AR9287_GOOD_VALUE;
a59b5a5e SB	224	else
a59b5a5e SB	225	noise_floor = AR_PHY_CCA_MAX_AR5416_GOOD_VALUE;
f1dc5600 S	226
	227	for (i = 0; i < NUM_NF_READINGS; i++) {
	228	ah->nfCalHist[i].currIndex = 0;
a59b5a5e	229	ah->nfCalHist[i].privNF = noise_floor;
f1dc5600 S	230	ah->nfCalHist[i].invalidNFcount =
	231	AR_PHY_CCA_FILTERWINDOW_LENGTH;
	232	for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) {
a59b5a5e	233	ah->nfCalHist[i].nfCalBuffer[j] = noise_floor;
f1dc5600 S	234	}
f1dc5600 S	235	}
f1dc5600 S	236	}
f1dc5600 S	237
cbe61d8a	238	s16 ath9k_hw_getchan_noise(struct ath_hw ah, struct ath9k_channel chan)
f1dc5600	239	{
f1dc5600 S	240	s16 nf;
f1dc5600 S	241
5f8e077c	242	if (chan->rawNoiseFloor == 0)
e56db718 LR	243	nf = -96;
e56db718 LR	244	else
5f8e077c	245	nf = chan->rawNoiseFloor;
f1dc5600 S	246
	247	if (!ath9k_hw_nf_in_range(ah, nf))
	248	nf = ATH_DEFAULT_NOISE_FLOOR;
	249
	250	return nf;
	251	}
7322fd19	252	EXPORT_SYMBOL(ath9k_hw_getchan_noise);