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freebsd-skq/sys/dev/ath/ath_hal/ar9002/ar9285_diversity.c
Adrian Chadd 68b3f39d74 Some diversity changes relating to AR9285. 
* grab the main, alt and selected LNA config
* add some optional / disabled logging code
* add a check to reject packets with an invalid main rssi too,
  in case the alt is the active receive chain and main is -ve.

Note: The software-controlled combined diversity code is still disabled.
2011-05-13 09:57:12 +00:00

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/*
* Copyright (c) 2008-2010 Atheros Communications Inc.
* Copyright (c) 2011 Adrian Chadd, Xenion Pty Ltd.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include "opt_ah.h"
#include "ah.h"
#include "ah_desc.h"
#include "ah_internal.h"
#include "ah_eeprom_v4k.h"
#include "ar9002/ar9280.h"
#include "ar9002/ar9285_diversity.h"
#include "ar9002/ar9285.h"
#include "ar5416/ar5416reg.h"
#include "ar5416/ar5416phy.h"
#include "ar9002/ar9285phy.h"
#include "ar9002/ar9285_phy.h"
/* Linux compability macros */
/*
* XXX these don't handle rounding, underflow, overflow, wrapping!
*/
#define msecs_to_jiffies(a) ( (a) * hz / 1000 )
#define time_after(a, b) ( (long) (b) - (long) (a) < 0 )
static HAL_BOOL
ath_is_alt_ant_ratio_better(int alt_ratio, int maxdelta, int mindelta,
int main_rssi_avg, int alt_rssi_avg, int pkt_count)
{
return (((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
(alt_rssi_avg > main_rssi_avg + maxdelta)) ||
(alt_rssi_avg > main_rssi_avg + mindelta)) && (pkt_count > 50);
}
static void
ath_lnaconf_alt_good_scan(struct ar9285_ant_comb *antcomb,
struct ar9285_antcomb_conf ant_conf, int main_rssi_avg)
{
antcomb->quick_scan_cnt = 0;
if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA2)
antcomb->rssi_lna2 = main_rssi_avg;
else if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA1)
antcomb->rssi_lna1 = main_rssi_avg;
switch ((ant_conf.main_lna_conf << 4) | ant_conf.alt_lna_conf) {
case (0x10): /* LNA2 A-B */
antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
antcomb->first_quick_scan_conf =
ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1;
break;
case (0x20): /* LNA1 A-B */
antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
antcomb->first_quick_scan_conf =
ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2;
break;
case (0x21): /* LNA1 LNA2 */
antcomb->main_conf = ATH_ANT_DIV_COMB_LNA2;
antcomb->first_quick_scan_conf =
ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
antcomb->second_quick_scan_conf =
ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
break;
case (0x12): /* LNA2 LNA1 */
antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1;
antcomb->first_quick_scan_conf =
ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
antcomb->second_quick_scan_conf =
ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
break;
case (0x13): /* LNA2 A+B */
antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
antcomb->first_quick_scan_conf =
ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1;
break;
case (0x23): /* LNA1 A+B */
antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
antcomb->first_quick_scan_conf =
ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2;
break;
default:
break;
}
}
static void
ath_select_ant_div_from_quick_scan(struct ar9285_ant_comb *antcomb,
struct ar9285_antcomb_conf *div_ant_conf, int main_rssi_avg,
int alt_rssi_avg, int alt_ratio)
{
/* alt_good */
switch (antcomb->quick_scan_cnt) {
case 0:
/* set alt to main, and alt to first conf */
div_ant_conf->main_lna_conf = antcomb->main_conf;
div_ant_conf->alt_lna_conf = antcomb->first_quick_scan_conf;
break;
case 1:
/* set alt to main, and alt to first conf */
div_ant_conf->main_lna_conf = antcomb->main_conf;
div_ant_conf->alt_lna_conf = antcomb->second_quick_scan_conf;
antcomb->rssi_first = main_rssi_avg;
antcomb->rssi_second = alt_rssi_avg;
if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) {
/* main is LNA1 */
if (ath_is_alt_ant_ratio_better(alt_ratio,
ATH_ANT_DIV_COMB_LNA1_DELTA_HI,
ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
main_rssi_avg, alt_rssi_avg,
antcomb->total_pkt_count))
antcomb->first_ratio = AH_TRUE;
else
antcomb->first_ratio = AH_FALSE;
} else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) {
if (ath_is_alt_ant_ratio_better(alt_ratio,
ATH_ANT_DIV_COMB_LNA1_DELTA_MID,
ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
main_rssi_avg, alt_rssi_avg,
antcomb->total_pkt_count))
antcomb->first_ratio = AH_TRUE;
else
antcomb->first_ratio = AH_FALSE;
} else {
if ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
(alt_rssi_avg > main_rssi_avg +
ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) ||
(alt_rssi_avg > main_rssi_avg)) &&
(antcomb->total_pkt_count > 50))
antcomb->first_ratio = AH_TRUE;
else
antcomb->first_ratio = AH_FALSE;
}
break;
case 2:
antcomb->alt_good = AH_FALSE;
antcomb->scan_not_start = AH_FALSE;
antcomb->scan = AH_FALSE;
antcomb->rssi_first = main_rssi_avg;
antcomb->rssi_third = alt_rssi_avg;
if (antcomb->second_quick_scan_conf == ATH_ANT_DIV_COMB_LNA1)
antcomb->rssi_lna1 = alt_rssi_avg;
else if (antcomb->second_quick_scan_conf ==
ATH_ANT_DIV_COMB_LNA2)
antcomb->rssi_lna2 = alt_rssi_avg;
else if (antcomb->second_quick_scan_conf ==
ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2) {
if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2)
antcomb->rssi_lna2 = main_rssi_avg;
else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1)
antcomb->rssi_lna1 = main_rssi_avg;
}
if (antcomb->rssi_lna2 > antcomb->rssi_lna1 +
ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA)
div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA2;
else
div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA1;
if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) {
if (ath_is_alt_ant_ratio_better(alt_ratio,
ATH_ANT_DIV_COMB_LNA1_DELTA_HI,
ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
main_rssi_avg, alt_rssi_avg,
antcomb->total_pkt_count))
antcomb->second_ratio = AH_TRUE;
else
antcomb->second_ratio = AH_FALSE;
} else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) {
if (ath_is_alt_ant_ratio_better(alt_ratio,
ATH_ANT_DIV_COMB_LNA1_DELTA_MID,
ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
main_rssi_avg, alt_rssi_avg,
antcomb->total_pkt_count))
antcomb->second_ratio = AH_TRUE;
else
antcomb->second_ratio = AH_FALSE;
} else {
if ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
(alt_rssi_avg > main_rssi_avg +
ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) ||
(alt_rssi_avg > main_rssi_avg)) &&
(antcomb->total_pkt_count > 50))
antcomb->second_ratio = AH_TRUE;
else
antcomb->second_ratio = AH_FALSE;
}
/* set alt to the conf with maximun ratio */
if (antcomb->first_ratio && antcomb->second_ratio) {
if (antcomb->rssi_second > antcomb->rssi_third) {
/* first alt*/
if ((antcomb->first_quick_scan_conf ==
ATH_ANT_DIV_COMB_LNA1) ||
(antcomb->first_quick_scan_conf ==
ATH_ANT_DIV_COMB_LNA2))
/* Set alt LNA1 or LNA2*/
if (div_ant_conf->main_lna_conf ==
ATH_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
else
/* Set alt to A+B or A-B */
div_ant_conf->alt_lna_conf =
antcomb->first_quick_scan_conf;
} else if ((antcomb->second_quick_scan_conf ==
ATH_ANT_DIV_COMB_LNA1) ||
(antcomb->second_quick_scan_conf ==
ATH_ANT_DIV_COMB_LNA2)) {
/* Set alt LNA1 or LNA2 */
if (div_ant_conf->main_lna_conf ==
ATH_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
} else {
/* Set alt to A+B or A-B */
div_ant_conf->alt_lna_conf =
antcomb->second_quick_scan_conf;
}
} else if (antcomb->first_ratio) {
/* first alt */
if ((antcomb->first_quick_scan_conf ==
ATH_ANT_DIV_COMB_LNA1) ||
(antcomb->first_quick_scan_conf ==
ATH_ANT_DIV_COMB_LNA2))
/* Set alt LNA1 or LNA2 */
if (div_ant_conf->main_lna_conf ==
ATH_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
else
/* Set alt to A+B or A-B */
div_ant_conf->alt_lna_conf =
antcomb->first_quick_scan_conf;
} else if (antcomb->second_ratio) {
/* second alt */
if ((antcomb->second_quick_scan_conf ==
ATH_ANT_DIV_COMB_LNA1) ||
(antcomb->second_quick_scan_conf ==
ATH_ANT_DIV_COMB_LNA2))
/* Set alt LNA1 or LNA2 */
if (div_ant_conf->main_lna_conf ==
ATH_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
else
/* Set alt to A+B or A-B */
div_ant_conf->alt_lna_conf =
antcomb->second_quick_scan_conf;
} else {
/* main is largest */
if ((antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) ||
(antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2))
/* Set alt LNA1 or LNA2 */
if (div_ant_conf->main_lna_conf ==
ATH_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
else
/* Set alt to A+B or A-B */
div_ant_conf->alt_lna_conf = antcomb->main_conf;
}
break;
default:
break;
}
}
static void
ath_ant_div_conf_fast_divbias(struct ar9285_antcomb_conf *ant_conf)
{
/* Adjust the fast_div_bias based on main and alt lna conf */
switch ((ant_conf->main_lna_conf << 4) | ant_conf->alt_lna_conf) {
case (0x01): /* A-B LNA2 */
ant_conf->fast_div_bias = 0x3b;
break;
case (0x02): /* A-B LNA1 */
ant_conf->fast_div_bias = 0x3d;
break;
case (0x03): /* A-B A+B */
ant_conf->fast_div_bias = 0x1;
break;
case (0x10): /* LNA2 A-B */
ant_conf->fast_div_bias = 0x7;
break;
case (0x12): /* LNA2 LNA1 */
ant_conf->fast_div_bias = 0x2;
break;
case (0x13): /* LNA2 A+B */
ant_conf->fast_div_bias = 0x7;
break;
case (0x20): /* LNA1 A-B */
ant_conf->fast_div_bias = 0x6;
break;
case (0x21): /* LNA1 LNA2 */
ant_conf->fast_div_bias = 0x0;
break;
case (0x23): /* LNA1 A+B */
ant_conf->fast_div_bias = 0x6;
break;
case (0x30): /* A+B A-B */
ant_conf->fast_div_bias = 0x1;
break;
case (0x31): /* A+B LNA2 */
ant_conf->fast_div_bias = 0x3b;
break;
case (0x32): /* A+B LNA1 */
ant_conf->fast_div_bias = 0x3d;
break;
default:
break;
}
}
/* Antenna diversity and combining */
void
ar9285_ant_comb_scan(struct ath_hal *ah, struct ath_rx_status *rs,
unsigned long ticks, int hz)
{
struct ar9285_antcomb_conf div_ant_conf;
struct ar9285_ant_comb *antcomb = &AH9285(ah)->ant_comb;
int alt_ratio = 0, alt_rssi_avg = 0, main_rssi_avg = 0, curr_alt_set;
int curr_main_set, curr_bias;
int main_rssi = rs->rs_rssi_ctl[0];
int alt_rssi = rs->rs_rssi_ctl[1];
int rx_ant_conf, main_ant_conf, alt_ant_conf;
HAL_BOOL short_scan = AH_FALSE;
rx_ant_conf = (rs->rs_rssi_ctl[2] >> 4) & ATH_ANT_RX_MASK;
main_ant_conf = (rs->rs_rssi_ctl[2] >> 2) & ATH_ANT_RX_MASK;
alt_ant_conf = (rs->rs_rssi_ctl[2] >> 0) & ATH_ANT_RX_MASK;
#if 0
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: RSSI %d/%d, conf %x/%x, rxconf %x, LNA: %d; ANT: %d; FastDiv: %d\n",
__func__, main_rssi, alt_rssi, main_ant_conf,alt_ant_conf, rx_ant_conf,
!!(rs->rs_rssi_ctl[2] & 0x80), !!(rs->rs_rssi_ctl[2] & 0x40), !!(rs->rs_rssi_ext[2] & 0x40));
#endif
if (! ar9285_check_div_comb(ah))
return;
if (AH5212(ah)->ah_diversity == AH_FALSE)
return;
#if 0
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: main: %d, alt: %d, rx_ant_conf: %x, main_ant_conf: %x\n",
__func__, main_rssi, alt_rssi, rx_ant_conf, main_ant_conf);
#endif
/* Record packet only when alt_rssi is positive */
if (main_rssi > 0 && alt_rssi > 0) {
antcomb->total_pkt_count++;
antcomb->main_total_rssi += main_rssi;
antcomb->alt_total_rssi += alt_rssi;
if (main_ant_conf == rx_ant_conf)
antcomb->main_recv_cnt++;
else
antcomb->alt_recv_cnt++;
}
/* Short scan check */
if (antcomb->scan && antcomb->alt_good) {
if (time_after(ticks, antcomb->scan_start_time +
msecs_to_jiffies(ATH_ANT_DIV_COMB_SHORT_SCAN_INTR)))
short_scan = AH_TRUE;
else
if (antcomb->total_pkt_count ==
ATH_ANT_DIV_COMB_SHORT_SCAN_PKTCOUNT) {
alt_ratio = ((antcomb->alt_recv_cnt * 100) /
antcomb->total_pkt_count);
if (alt_ratio < ATH_ANT_DIV_COMB_ALT_ANT_RATIO)
short_scan = AH_TRUE;
}
}
if (((antcomb->total_pkt_count < ATH_ANT_DIV_COMB_MAX_PKTCOUNT) ||
rs->rs_moreaggr) && !short_scan)
return;
if (antcomb->total_pkt_count) {
alt_ratio = ((antcomb->alt_recv_cnt * 100) /
antcomb->total_pkt_count);
main_rssi_avg = (antcomb->main_total_rssi /
antcomb->total_pkt_count);
alt_rssi_avg = (antcomb->alt_total_rssi /
antcomb->total_pkt_count);
}
ar9285_antdiv_comb_conf_get(ah, &div_ant_conf);
curr_alt_set = div_ant_conf.alt_lna_conf;
curr_main_set = div_ant_conf.main_lna_conf;
curr_bias = div_ant_conf.fast_div_bias;
antcomb->count++;
if (antcomb->count == ATH_ANT_DIV_COMB_MAX_COUNT) {
if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) {
ath_lnaconf_alt_good_scan(antcomb, div_ant_conf,
main_rssi_avg);
antcomb->alt_good = AH_TRUE;
} else {
antcomb->alt_good = AH_FALSE;
}
antcomb->count = 0;
antcomb->scan = AH_TRUE;
antcomb->scan_not_start = AH_TRUE;
}
if (!antcomb->scan) {
if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) {
if (curr_alt_set == ATH_ANT_DIV_COMB_LNA2) {
/* Switch main and alt LNA */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
} else if (curr_alt_set == ATH_ANT_DIV_COMB_LNA1) {
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
}
goto div_comb_done;
} else if ((curr_alt_set != ATH_ANT_DIV_COMB_LNA1) &&
(curr_alt_set != ATH_ANT_DIV_COMB_LNA2)) {
/* Set alt to another LNA */
if (curr_main_set == ATH_ANT_DIV_COMB_LNA2)
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1)
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
goto div_comb_done;
}
if ((alt_rssi_avg < (main_rssi_avg +
ATH_ANT_DIV_COMB_LNA1_LNA2_DELTA)))
goto div_comb_done;
}
if (!antcomb->scan_not_start) {
switch (curr_alt_set) {
case ATH_ANT_DIV_COMB_LNA2:
antcomb->rssi_lna2 = alt_rssi_avg;
antcomb->rssi_lna1 = main_rssi_avg;
antcomb->scan = AH_TRUE;
/* set to A+B */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
break;
case ATH_ANT_DIV_COMB_LNA1:
antcomb->rssi_lna1 = alt_rssi_avg;
antcomb->rssi_lna2 = main_rssi_avg;
antcomb->scan = AH_TRUE;
/* set to A+B */
div_ant_conf.main_lna_conf = ATH_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
break;
case ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2:
antcomb->rssi_add = alt_rssi_avg;
antcomb->scan = AH_TRUE;
/* set to A-B */
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
break;
case ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2:
antcomb->rssi_sub = alt_rssi_avg;
antcomb->scan = AH_FALSE;
if (antcomb->rssi_lna2 >
(antcomb->rssi_lna1 +
ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA)) {
/* use LNA2 as main LNA */
if ((antcomb->rssi_add > antcomb->rssi_lna1) &&
(antcomb->rssi_add > antcomb->rssi_sub)) {
/* set to A+B */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
} else if (antcomb->rssi_sub >
antcomb->rssi_lna1) {
/* set to A-B */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
} else {
/* set to LNA1 */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
}
} else {
/* use LNA1 as main LNA */
if ((antcomb->rssi_add > antcomb->rssi_lna2) &&
(antcomb->rssi_add > antcomb->rssi_sub)) {
/* set to A+B */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
} else if (antcomb->rssi_sub >
antcomb->rssi_lna1) {
/* set to A-B */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
} else {
/* set to LNA2 */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
}
}
break;
default:
break;
}
} else {
if (!antcomb->alt_good) {
antcomb->scan_not_start = AH_FALSE;
/* Set alt to another LNA */
if (curr_main_set == ATH_ANT_DIV_COMB_LNA2) {
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
} else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1) {
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
}
goto div_comb_done;
}
}
ath_select_ant_div_from_quick_scan(antcomb, &div_ant_conf,
main_rssi_avg, alt_rssi_avg,
alt_ratio);
antcomb->quick_scan_cnt++;
div_comb_done:
ath_ant_div_conf_fast_divbias(&div_ant_conf);
ar9285_antdiv_comb_conf_set(ah, &div_ant_conf);
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: total_pkt_count=%d\n",
__func__, antcomb->total_pkt_count);
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: main_total_rssi=%d\n",
__func__, antcomb->main_total_rssi);
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: alt_total_rssi=%d\n",
__func__, antcomb->alt_total_rssi);
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: main_rssi_avg=%d\n",
__func__, main_rssi_avg);
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: alt_alt_rssi_avg=%d\n",
__func__, alt_rssi_avg);
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: main_recv_cnt=%d\n",
__func__, antcomb->main_recv_cnt);
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: alt_recv_cnt=%d\n",
__func__, antcomb->alt_recv_cnt);
// if (curr_alt_set != div_ant_conf.alt_lna_conf)
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: lna_conf: %x -> %x\n",
__func__, curr_alt_set, div_ant_conf.alt_lna_conf);
// if (curr_main_set != div_ant_conf.main_lna_conf)
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: main_lna_conf: %x -> %x\n",
__func__, curr_main_set, div_ant_conf.main_lna_conf);
// if (curr_bias != div_ant_conf.fast_div_bias)
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: fast_div_bias: %x -> %x\n",
__func__, curr_bias, div_ant_conf.fast_div_bias);
antcomb->scan_start_time = ticks;
antcomb->total_pkt_count = 0;
antcomb->main_total_rssi = 0;
antcomb->alt_total_rssi = 0;
antcomb->main_recv_cnt = 0;
antcomb->alt_recv_cnt = 0;
}
/*
* Set the antenna switch to control RX antenna diversity.
*
* If a fixed configuration is used, the LNA and div bias
* settings are fixed and the antenna diversity scanning routine
* is disabled.
*
* If a variable configuration is used, a default is programmed
* in and sampling commences per RXed packet.
*
* Since this is called from ar9285SetBoardValues() to setup
* diversity, it means that after a reset or scan, any current
* software diversity combining settings will be lost and won't
* re-appear until after the first successful sample run.
* Please keep this in mind if you're seeing weird performance
* that happens to relate to scan/diversity timing.
*/
HAL_BOOL
ar9285SetAntennaSwitch(struct ath_hal *ah, HAL_ANT_SETTING settings)
{
int regVal;
const HAL_EEPROM_v4k *ee = AH_PRIVATE(ah)->ah_eeprom;
const MODAL_EEP4K_HEADER *pModal = &ee->ee_base.modalHeader;
uint8_t ant_div_control1, ant_div_control2;
if (pModal->version < 3) {
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: not supported\n",
__func__);
return AH_FALSE; /* Can't do diversity */
}
/* Store settings */
AH5212(ah)->ah_antControl = settings;
AH5212(ah)->ah_diversity = (settings == HAL_ANT_VARIABLE);
/* XXX don't fiddle if the PHY is in sleep mode or ! chan */
/* Begin setting the relevant registers */
ant_div_control1 = pModal->antdiv_ctl1;
ant_div_control2 = pModal->antdiv_ctl2;
regVal = OS_REG_READ(ah, AR_PHY_MULTICHAIN_GAIN_CTL);
regVal &= (~(AR_PHY_9285_ANT_DIV_CTL_ALL));
/* enable antenna diversity only if diversityControl == HAL_ANT_VARIABLE */
if (settings == HAL_ANT_VARIABLE)
regVal |= SM(ant_div_control1, AR_PHY_9285_ANT_DIV_CTL);
if (settings == HAL_ANT_VARIABLE) {
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: HAL_ANT_VARIABLE\n",
__func__);
regVal |= SM(ant_div_control2, AR_PHY_9285_ANT_DIV_ALT_LNACONF);
regVal |= SM((ant_div_control2 >> 2), AR_PHY_9285_ANT_DIV_MAIN_LNACONF);
regVal |= SM((ant_div_control1 >> 1), AR_PHY_9285_ANT_DIV_ALT_GAINTB);
regVal |= SM((ant_div_control1 >> 2), AR_PHY_9285_ANT_DIV_MAIN_GAINTB);
} else {
if (settings == HAL_ANT_FIXED_A) {
/* Diversity disabled, RX = LNA1 */
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: HAL_ANT_FIXED_A\n",
__func__);
regVal |= SM(ATH_ANT_DIV_COMB_LNA2, AR_PHY_9285_ANT_DIV_ALT_LNACONF);
regVal |= SM(ATH_ANT_DIV_COMB_LNA1, AR_PHY_9285_ANT_DIV_MAIN_LNACONF);
regVal |= SM(AR_PHY_9285_ANT_DIV_GAINTB_0, AR_PHY_9285_ANT_DIV_ALT_GAINTB);
regVal |= SM(AR_PHY_9285_ANT_DIV_GAINTB_1, AR_PHY_9285_ANT_DIV_MAIN_GAINTB);
}
else if (settings == HAL_ANT_FIXED_B) {
/* Diversity disabled, RX = LNA2 */
HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: HAL_ANT_FIXED_B\n",
__func__);
regVal |= SM(ATH_ANT_DIV_COMB_LNA1, AR_PHY_9285_ANT_DIV_ALT_LNACONF);
regVal |= SM(ATH_ANT_DIV_COMB_LNA2, AR_PHY_9285_ANT_DIV_MAIN_LNACONF);
regVal |= SM(AR_PHY_9285_ANT_DIV_GAINTB_1, AR_PHY_9285_ANT_DIV_ALT_GAINTB);
regVal |= SM(AR_PHY_9285_ANT_DIV_GAINTB_0, AR_PHY_9285_ANT_DIV_MAIN_GAINTB);
}
}
OS_REG_WRITE(ah, AR_PHY_MULTICHAIN_GAIN_CTL, regVal);
regVal = OS_REG_READ(ah, AR_PHY_MULTICHAIN_GAIN_CTL);
regVal = OS_REG_READ(ah, AR_PHY_CCK_DETECT);
regVal &= (~AR_PHY_CCK_DETECT_BB_ENABLE_ANT_FAST_DIV);
if (settings == HAL_ANT_VARIABLE)
regVal |= SM((ant_div_control1 >> 3), AR_PHY_CCK_DETECT_BB_ENABLE_ANT_FAST_DIV);
OS_REG_WRITE(ah, AR_PHY_CCK_DETECT, regVal);
regVal = OS_REG_READ(ah, AR_PHY_CCK_DETECT);
/*
* If Diversity combining is available and the diversity setting
* is to allow variable diversity, enable it by default.
*
* This will be eventually overridden by the software antenna
* diversity logic.
*
* Note that yes, this following section overrides the above
* settings for the LNA configuration and fast-bias.
*/
if (ar9285_check_div_comb(ah) && AH5212(ah)->ah_diversity == AH_TRUE) {
// If support DivComb, set MAIN to LNA1 and ALT to LNA2 at the first beginning
HALDEBUG(ah, HAL_DEBUG_DIVERSITY,
"%s: Enable initial settings for combined diversity\n",
__func__);
regVal = OS_REG_READ(ah, AR_PHY_MULTICHAIN_GAIN_CTL);
regVal &= (~(AR_PHY_9285_ANT_DIV_MAIN_LNACONF | AR_PHY_9285_ANT_DIV_ALT_LNACONF));
regVal |= (ATH_ANT_DIV_COMB_LNA1 << AR_PHY_9285_ANT_DIV_MAIN_LNACONF_S);
regVal |= (ATH_ANT_DIV_COMB_LNA2 << AR_PHY_9285_ANT_DIV_ALT_LNACONF_S);
regVal &= (~(AR_PHY_9285_FAST_DIV_BIAS));
regVal |= (0 << AR_PHY_9285_FAST_DIV_BIAS_S);
OS_REG_WRITE(ah, AR_PHY_MULTICHAIN_GAIN_CTL, regVal);
}
return AH_TRUE;
}
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