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freebsd-skq/sys/dev/ath/if_ath_lna_div.c
adrian ad69138108 Initial AR9485/AR933x 1x1 LNA diversity work. 
* Add the LNA configuration table entries for AR933x/AR9485
* Add a chip-dependent LNA signal level delta in the startup path
* Add a TODO list for the stuff I haven't yet ported over but
  I haven't.

Tested:

* AR9462 with LNA diversity enabled
2013-06-14 03:42:10 +00:00

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/*-
* Copyright (c) 2013 Adrian Chadd <adrian@FreeBSD.org>
* All rights reserved.
*
* 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,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
* redistribution must be conditioned upon including a substantially
* similar Disclaimer requirement for further binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* This module handles LNA diversity for those chips which implement LNA
* mixing (AR9285/AR9485.)
*/
#include "opt_ath.h"
#include "opt_inet.h"
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/errno.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/bus.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/if_arp.h>
#include <net/ethernet.h> /* XXX for ether_sprintf */
#include <net80211/ieee80211_var.h>
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif
#include <dev/ath/if_athvar.h>
#include <dev/ath/if_ath_debug.h>
#include <dev/ath/if_ath_lna_div.h>
/* Linux compability macros */
/*
* XXX these don't handle rounding, underflow, overflow, wrapping!
*/
#define msecs_to_jiffies(a) ( (a) * hz / 1000 )
/*
* Methods which are required
*/
/*
* Attach the LNA diversity to the given interface
*/
int
ath_lna_div_attach(struct ath_softc *sc)
{
struct if_ath_ant_comb_state *ss;
HAL_ANT_COMB_CONFIG div_ant_conf;
/* Only do this if diversity is enabled */
if (! ath_hal_hasdivantcomb(sc->sc_ah))
return (0);
ss = malloc(sizeof(struct if_ath_ant_comb_state),
M_TEMP, M_WAITOK | M_ZERO);
if (ss == NULL) {
device_printf(sc->sc_dev, "%s: failed to allocate\n",
__func__);
/* Don't fail at this point */
return (0);
}
/* Fetch the hardware configuration */
OS_MEMZERO(&div_ant_conf, sizeof(div_ant_conf));
ath_hal_div_comb_conf_get(sc->sc_ah, &div_ant_conf);
/* Figure out what the hardware specific bits should be */
if ((div_ant_conf.antdiv_configgroup == HAL_ANTDIV_CONFIG_GROUP_1) ||
(div_ant_conf.antdiv_configgroup == HAL_ANTDIV_CONFIG_GROUP_2)) {
ss->lna1_lna2_delta = -9;
} else {
ss->lna1_lna2_delta = -3;
}
/* Let's flip this on */
sc->sc_lna_div = ss;
sc->sc_dolnadiv = 1;
return (0);
}
/*
* Detach the LNA diversity state from the given interface
*/
int
ath_lna_div_detach(struct ath_softc *sc)
{
if (sc->sc_lna_div != NULL) {
free(sc->sc_lna_div, M_TEMP);
sc->sc_lna_div = NULL;
}
sc->sc_dolnadiv = 0;
return (0);
}
/*
* Enable LNA diversity on the current channel if it's required.
*/
int
ath_lna_div_enable(struct ath_softc *sc, const struct ieee80211_channel *chan)
{
return (0);
}
/*
* Handle ioctl requests from the diagnostic interface.
*
* The initial part of this code resembles ath_ioctl_diag();
* it's likely a good idea to reduce duplication between
* these two routines.
*/
int
ath_lna_div_ioctl(struct ath_softc *sc, struct ath_diag *ad)
{
unsigned int id = ad->ad_id & ATH_DIAG_ID;
void *indata = NULL;
void *outdata = NULL;
u_int32_t insize = ad->ad_in_size;
u_int32_t outsize = ad->ad_out_size;
int error = 0;
// int val;
if (ad->ad_id & ATH_DIAG_IN) {
/*
* Copy in data.
*/
indata = malloc(insize, M_TEMP, M_NOWAIT);
if (indata == NULL) {
error = ENOMEM;
goto bad;
}
error = copyin(ad->ad_in_data, indata, insize);
if (error)
goto bad;
}
if (ad->ad_id & ATH_DIAG_DYN) {
/*
* Allocate a buffer for the results (otherwise the HAL
* returns a pointer to a buffer where we can read the
* results). Note that we depend on the HAL leaving this
* pointer for us to use below in reclaiming the buffer;
* may want to be more defensive.
*/
outdata = malloc(outsize, M_TEMP, M_NOWAIT);
if (outdata == NULL) {
error = ENOMEM;
goto bad;
}
}
switch (id) {
default:
error = EINVAL;
}
if (outsize < ad->ad_out_size)
ad->ad_out_size = outsize;
if (outdata && copyout(outdata, ad->ad_out_data, ad->ad_out_size))
error = EFAULT;
bad:
if ((ad->ad_id & ATH_DIAG_IN) && indata != NULL)
free(indata, M_TEMP);
if ((ad->ad_id & ATH_DIAG_DYN) && outdata != NULL)
free(outdata, M_TEMP);
return (error);
}
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 if_ath_ant_comb_state *antcomb,
HAL_ANT_COMB_CONFIG *ant_conf, int main_rssi_avg)
{
antcomb->quick_scan_cnt = 0;
if (ant_conf->main_lna_conf == HAL_ANT_DIV_COMB_LNA2)
antcomb->rssi_lna2 = main_rssi_avg;
else if (ant_conf->main_lna_conf == HAL_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 = HAL_ANT_DIV_COMB_LNA1_MINUS_LNA2;
antcomb->first_quick_scan_conf =
HAL_ANT_DIV_COMB_LNA1_PLUS_LNA2;
antcomb->second_quick_scan_conf = HAL_ANT_DIV_COMB_LNA1;
break;
case (0x20): /* LNA1 A-B */
antcomb->main_conf = HAL_ANT_DIV_COMB_LNA1_MINUS_LNA2;
antcomb->first_quick_scan_conf =
HAL_ANT_DIV_COMB_LNA1_PLUS_LNA2;
antcomb->second_quick_scan_conf = HAL_ANT_DIV_COMB_LNA2;
break;
case (0x21): /* LNA1 LNA2 */
antcomb->main_conf = HAL_ANT_DIV_COMB_LNA2;
antcomb->first_quick_scan_conf =
HAL_ANT_DIV_COMB_LNA1_MINUS_LNA2;
antcomb->second_quick_scan_conf =
HAL_ANT_DIV_COMB_LNA1_PLUS_LNA2;
break;
case (0x12): /* LNA2 LNA1 */
antcomb->main_conf = HAL_ANT_DIV_COMB_LNA1;
antcomb->first_quick_scan_conf =
HAL_ANT_DIV_COMB_LNA1_MINUS_LNA2;
antcomb->second_quick_scan_conf =
HAL_ANT_DIV_COMB_LNA1_PLUS_LNA2;
break;
case (0x13): /* LNA2 A+B */
antcomb->main_conf = HAL_ANT_DIV_COMB_LNA1_PLUS_LNA2;
antcomb->first_quick_scan_conf =
HAL_ANT_DIV_COMB_LNA1_MINUS_LNA2;
antcomb->second_quick_scan_conf = HAL_ANT_DIV_COMB_LNA1;
break;
case (0x23): /* LNA1 A+B */
antcomb->main_conf = HAL_ANT_DIV_COMB_LNA1_PLUS_LNA2;
antcomb->first_quick_scan_conf =
HAL_ANT_DIV_COMB_LNA1_MINUS_LNA2;
antcomb->second_quick_scan_conf = HAL_ANT_DIV_COMB_LNA2;
break;
default:
break;
}
}
static void
ath_select_ant_div_from_quick_scan(struct if_ath_ant_comb_state *antcomb,
HAL_ANT_COMB_CONFIG *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 == HAL_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 == HAL_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 == HAL_ANT_DIV_COMB_LNA1)
antcomb->rssi_lna1 = alt_rssi_avg;
else if (antcomb->second_quick_scan_conf ==
HAL_ANT_DIV_COMB_LNA2)
antcomb->rssi_lna2 = alt_rssi_avg;
else if (antcomb->second_quick_scan_conf ==
HAL_ANT_DIV_COMB_LNA1_PLUS_LNA2) {
if (antcomb->main_conf == HAL_ANT_DIV_COMB_LNA2)
antcomb->rssi_lna2 = main_rssi_avg;
else if (antcomb->main_conf == HAL_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 = HAL_ANT_DIV_COMB_LNA2;
else
div_ant_conf->main_lna_conf = HAL_ANT_DIV_COMB_LNA1;
if (antcomb->main_conf == HAL_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 == HAL_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 ==
HAL_ANT_DIV_COMB_LNA1) ||
(antcomb->first_quick_scan_conf ==
HAL_ANT_DIV_COMB_LNA2))
/* Set alt LNA1 or LNA2*/
if (div_ant_conf->main_lna_conf ==
HAL_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
HAL_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 ==
HAL_ANT_DIV_COMB_LNA1) ||
(antcomb->second_quick_scan_conf ==
HAL_ANT_DIV_COMB_LNA2)) {
/* Set alt LNA1 or LNA2 */
if (div_ant_conf->main_lna_conf ==
HAL_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
HAL_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 ==
HAL_ANT_DIV_COMB_LNA1) ||
(antcomb->first_quick_scan_conf ==
HAL_ANT_DIV_COMB_LNA2))
/* Set alt LNA1 or LNA2 */
if (div_ant_conf->main_lna_conf ==
HAL_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
HAL_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 ==
HAL_ANT_DIV_COMB_LNA1) ||
(antcomb->second_quick_scan_conf ==
HAL_ANT_DIV_COMB_LNA2))
/* Set alt LNA1 or LNA2 */
if (div_ant_conf->main_lna_conf ==
HAL_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
HAL_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 == HAL_ANT_DIV_COMB_LNA1) ||
(antcomb->main_conf == HAL_ANT_DIV_COMB_LNA2))
/* Set alt LNA1 or LNA2 */
if (div_ant_conf->main_lna_conf ==
HAL_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
HAL_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_adjust_fast_divbias(struct if_ath_ant_comb_state *antcomb,
int alt_ratio, int alt_ant_ratio_th, u_int config_group,
HAL_ANT_COMB_CONFIG *pdiv_ant_conf)
{
if (config_group == HAL_ANTDIV_CONFIG_GROUP_1) {
switch ((pdiv_ant_conf->main_lna_conf << 4)
| pdiv_ant_conf->alt_lna_conf) {
case (0x01): //A-B LNA2
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x02): //A-B LNA1
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x03): //A-B A+B
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x10): //LNA2 A-B
if ((antcomb->scan == 0)
&& (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)) {
pdiv_ant_conf->fast_div_bias = 0x3f;
} else {
pdiv_ant_conf->fast_div_bias = 0x1;
}
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x12): //LNA2 LNA1
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x13): //LNA2 A+B
if ((antcomb->scan == 0)
&& (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)) {
pdiv_ant_conf->fast_div_bias = 0x3f;
} else {
pdiv_ant_conf->fast_div_bias = 0x1;
}
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x20): //LNA1 A-B
if ((antcomb->scan == 0)
&& (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)) {
pdiv_ant_conf->fast_div_bias = 0x3f;
} else {
pdiv_ant_conf->fast_div_bias = 0x1;
}
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x21): //LNA1 LNA2
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x23): //LNA1 A+B
if ((antcomb->scan == 0)
&& (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)) {
pdiv_ant_conf->fast_div_bias = 0x3f;
} else {
pdiv_ant_conf->fast_div_bias = 0x1;
}
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x30): //A+B A-B
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x31): //A+B LNA2
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x32): //A+B LNA1
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
default:
break;
}
} else if (config_group == HAL_ANTDIV_CONFIG_GROUP_2) {
switch ((pdiv_ant_conf->main_lna_conf << 4)
| pdiv_ant_conf->alt_lna_conf) {
case (0x01): //A-B LNA2
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x02): //A-B LNA1
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x03): //A-B A+B
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x10): //LNA2 A-B
if ((antcomb->scan == 0)
&& (alt_ratio > alt_ant_ratio_th)) {
pdiv_ant_conf->fast_div_bias = 0x1;
} else {
pdiv_ant_conf->fast_div_bias = 0x2;
}
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x12): //LNA2 LNA1
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x13): //LNA2 A+B
if ((antcomb->scan == 0)
&& (alt_ratio > alt_ant_ratio_th)) {
pdiv_ant_conf->fast_div_bias = 0x1;
} else {
pdiv_ant_conf->fast_div_bias = 0x2;
}
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x20): //LNA1 A-B
if ((antcomb->scan == 0)
&& (alt_ratio > alt_ant_ratio_th)) {
pdiv_ant_conf->fast_div_bias = 0x1;
} else {
pdiv_ant_conf->fast_div_bias = 0x2;
}
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x21): //LNA1 LNA2
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x23): //LNA1 A+B
if ((antcomb->scan == 0)
&& (alt_ratio > alt_ant_ratio_th)) {
pdiv_ant_conf->fast_div_bias = 0x1;
} else {
pdiv_ant_conf->fast_div_bias = 0x2;
}
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x30): //A+B A-B
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x31): //A+B LNA2
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
case (0x32): //A+B LNA1
pdiv_ant_conf->fast_div_bias = 0x1;
pdiv_ant_conf->main_gaintb = 0;
pdiv_ant_conf->alt_gaintb = 0;
break;
default:
break;
}
} else { /* DEFAULT_ANTDIV_CONFIG_GROUP */
switch ((pdiv_ant_conf->main_lna_conf << 4) | pdiv_ant_conf->alt_lna_conf) {
case (0x01): //A-B LNA2
pdiv_ant_conf->fast_div_bias = 0x3b;
break;
case (0x02): //A-B LNA1
pdiv_ant_conf->fast_div_bias = 0x3d;
break;
case (0x03): //A-B A+B
pdiv_ant_conf->fast_div_bias = 0x1;
break;
case (0x10): //LNA2 A-B
pdiv_ant_conf->fast_div_bias = 0x7;
break;
case (0x12): //LNA2 LNA1
pdiv_ant_conf->fast_div_bias = 0x2;
break;
case (0x13): //LNA2 A+B
pdiv_ant_conf->fast_div_bias = 0x7;
break;
case (0x20): //LNA1 A-B
pdiv_ant_conf->fast_div_bias = 0x6;
break;
case (0x21): //LNA1 LNA2
pdiv_ant_conf->fast_div_bias = 0x0;
break;
case (0x23): //LNA1 A+B
pdiv_ant_conf->fast_div_bias = 0x6;
break;
case (0x30): //A+B A-B
pdiv_ant_conf->fast_div_bias = 0x1;
break;
case (0x31): //A+B LNA2
pdiv_ant_conf->fast_div_bias = 0x3b;
break;
case (0x32): //A+B LNA1
pdiv_ant_conf->fast_div_bias = 0x3d;
break;
default:
break;
}
}
}
/*
* AR9485/AR933x TODO:
* + Select a ratio based on whether RSSI is low or not; but I need
* to figure out what "low_rssi_th" is sourced from.
* + What's ath_ant_div_comb_alt_check() in the reference driver do?
* + .. and there's likely a bunch of other things to include in this.
*/
/* Antenna diversity and combining */
void
ath_lna_rx_comb_scan(struct ath_softc *sc, struct ath_rx_status *rs,
unsigned long ticks, int hz)
{
HAL_ANT_COMB_CONFIG div_ant_conf;
struct if_ath_ant_comb_state *antcomb = sc->sc_lna_div;
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
DPRINTF(sc, ATH_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 LNA diversity combining isn't enabled, don't run this.
*/
if (! sc->sc_dolnadiv)
return;
/*
* XXX this is ugly, but the HAL code attaches the
* LNA diversity to the TX antenna settings.
* I don't know why.
*/
if (sc->sc_txantenna != HAL_ANT_VARIABLE)
return;
/* 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 0
DPRINTF(sc, ATH_DEBUG_DIVERSITY,
"%s: total pkt=%d, aggr=%d, short_scan=%d\n",
__func__,
antcomb->total_pkt_count,
!! (rs->rs_moreaggr),
!! (short_scan));
#endif
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);
}
OS_MEMZERO(&div_ant_conf, sizeof(div_ant_conf));
ath_hal_div_comb_conf_get(sc->sc_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 == HAL_ANT_DIV_COMB_LNA2) {
/* Switch main and alt LNA */
div_ant_conf.main_lna_conf =
HAL_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1;
} else if (curr_alt_set == HAL_ANT_DIV_COMB_LNA1) {
div_ant_conf.main_lna_conf =
HAL_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
HAL_ANT_DIV_COMB_LNA2;
}
goto div_comb_done;
} else if ((curr_alt_set != HAL_ANT_DIV_COMB_LNA1) &&
(curr_alt_set != HAL_ANT_DIV_COMB_LNA2)) {
/* Set alt to another LNA */
if (curr_main_set == HAL_ANT_DIV_COMB_LNA2)
div_ant_conf.alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1;
else if (curr_main_set == HAL_ANT_DIV_COMB_LNA1)
div_ant_conf.alt_lna_conf =
HAL_ANT_DIV_COMB_LNA2;
goto div_comb_done;
}
if ((alt_rssi_avg < (main_rssi_avg +
antcomb->lna1_lna2_delta)))
goto div_comb_done;
}
if (!antcomb->scan_not_start) {
switch (curr_alt_set) {
case HAL_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 =
HAL_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1_PLUS_LNA2;
break;
case HAL_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 = HAL_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1_PLUS_LNA2;
break;
case HAL_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 =
HAL_ANT_DIV_COMB_LNA1_MINUS_LNA2;
break;
case HAL_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 =
HAL_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1_PLUS_LNA2;
} else if (antcomb->rssi_sub >
antcomb->rssi_lna1) {
/* set to A-B */
div_ant_conf.main_lna_conf =
HAL_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1_MINUS_LNA2;
} else {
/* set to LNA1 */
div_ant_conf.main_lna_conf =
HAL_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
HAL_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 =
HAL_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1_PLUS_LNA2;
} else if (antcomb->rssi_sub >
antcomb->rssi_lna1) {
/* set to A-B */
div_ant_conf.main_lna_conf =
HAL_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1_MINUS_LNA2;
} else {
/* set to LNA2 */
div_ant_conf.main_lna_conf =
HAL_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
HAL_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 == HAL_ANT_DIV_COMB_LNA2) {
div_ant_conf.main_lna_conf =
HAL_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
HAL_ANT_DIV_COMB_LNA1;
} else if (curr_main_set == HAL_ANT_DIV_COMB_LNA1) {
div_ant_conf.main_lna_conf =
HAL_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
HAL_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:
#if 0
ath_ant_div_conf_fast_divbias(&div_ant_conf);
#endif
ath_ant_adjust_fast_divbias(antcomb,
alt_ratio,
ATH_ANT_DIV_COMB_ALT_ANT_RATIO,
div_ant_conf.antdiv_configgroup,
&div_ant_conf);
ath_hal_div_comb_conf_set(sc->sc_ah, &div_ant_conf);
DPRINTF(sc, ATH_DEBUG_DIVERSITY, "%s: total_pkt_count=%d\n",
__func__, antcomb->total_pkt_count);
DPRINTF(sc, ATH_DEBUG_DIVERSITY, "%s: main_total_rssi=%d\n",
__func__, antcomb->main_total_rssi);
DPRINTF(sc, ATH_DEBUG_DIVERSITY, "%s: alt_total_rssi=%d\n",
__func__, antcomb->alt_total_rssi);
DPRINTF(sc, ATH_DEBUG_DIVERSITY, "%s: main_rssi_avg=%d\n",
__func__, main_rssi_avg);
DPRINTF(sc, ATH_DEBUG_DIVERSITY, "%s: alt_alt_rssi_avg=%d\n",
__func__, alt_rssi_avg);
DPRINTF(sc, ATH_DEBUG_DIVERSITY, "%s: main_recv_cnt=%d\n",
__func__, antcomb->main_recv_cnt);
DPRINTF(sc, ATH_DEBUG_DIVERSITY, "%s: alt_recv_cnt=%d\n",
__func__, antcomb->alt_recv_cnt);
// if (curr_alt_set != div_ant_conf.alt_lna_conf)
DPRINTF(sc, ATH_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)
DPRINTF(sc, ATH_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)
DPRINTF(sc, ATH_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;
}
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