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[ath_hal] [ar9300] initial radar decode for AR9380 and later chips.

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This commit is contained in:
Adrian Chadd 2017-02-03 03:57:06 +00:00
parent b3b5bfeb22
commit c15fdc23c7
1 changed files with 196 additions and 1 deletions
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197
sys/contrib/dev/ath/ath_hal/ar9300/ar9300_freebsd.c
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@ -109,6 +109,201 @@ ar9300_freebsd_set_tsf64(struct ath_hal *ah, uint64_t tsf64)
OS_REG_WRITE(ah, AR_TSF_U32, (tsf64 >> 32) & 0xffffffff);
}
/* Flags for pulse_bw_info */
#define PRI_CH_RADAR_FOUND 0x01
#define EXT_CH_RADAR_FOUND 0x02
#define EXT_CH_RADAR_EARLY_FOUND 0x04
static HAL_BOOL
ar9300_freebsd_proc_radar_event(struct ath_hal *ah, struct ath_rx_status *rxs,
uint64_t fulltsf, const char *buf, HAL_DFS_EVENT *event)
{
HAL_BOOL doDfsExtCh;
HAL_BOOL doDfsEnhanced;
HAL_BOOL doDfsCombinedRssi;
uint8_t rssi = 0, ext_rssi = 0;
uint8_t pulse_bw_info = 0, pulse_length_ext = 0, pulse_length_pri = 0;
uint32_t dur = 0;
int pri_found = 1, ext_found = 0;
int early_ext = 0;
int is_dc = 0;
uint16_t datalen; /* length from the RX status field */
/* Check whether the given phy error is a radar event */
if ((rxs->rs_phyerr != HAL_PHYERR_RADAR) &&
(rxs->rs_phyerr != HAL_PHYERR_FALSE_RADAR_EXT)) {
return AH_FALSE;
}
/* Grab copies of the capabilities; just to make the code clearer */
doDfsExtCh = AH_PRIVATE(ah)->ah_caps.halExtChanDfsSupport;
doDfsEnhanced = AH_PRIVATE(ah)->ah_caps.halEnhancedDfsSupport;
doDfsCombinedRssi = AH_PRIVATE(ah)->ah_caps.halUseCombinedRadarRssi;
datalen = rxs->rs_datalen;
/* If hardware supports it, use combined RSSI, else use chain 0 RSSI */
if (doDfsCombinedRssi)
rssi = (uint8_t) rxs->rs_rssi;
else
rssi = (uint8_t) rxs->rs_rssi_ctl[0];
/* Set this; but only use it if doDfsExtCh is set */
ext_rssi = (uint8_t) rxs->rs_rssi_ext[0];
/* Cap it at 0 if the RSSI is a negative number */
if (rssi & 0x80)
rssi = 0;
if (ext_rssi & 0x80)
ext_rssi = 0;
/*
* Fetch the relevant data from the frame
*/
if (doDfsExtCh) {
if (datalen < 3)
return AH_FALSE;
/* Last three bytes of the frame are of interest */
pulse_length_pri = *(buf + datalen - 3);
pulse_length_ext = *(buf + datalen - 2);
pulse_bw_info = *(buf + datalen - 1);
HALDEBUG(ah, HAL_DEBUG_DFS, "%s: rssi=%d, ext_rssi=%d, pulse_length_pri=%d,"
" pulse_length_ext=%d, pulse_bw_info=%x\n",
__func__, rssi, ext_rssi, pulse_length_pri, pulse_length_ext,
pulse_bw_info);
} else {
/* The pulse width is byte 0 of the data */
if (datalen >= 1)
dur = ((uint8_t) buf[0]) & 0xff;
else
dur = 0;
if (dur == 0 && rssi == 0) {
HALDEBUG(ah, HAL_DEBUG_DFS, "%s: dur and rssi are 0\n", __func__);
return AH_FALSE;
}
HALDEBUG(ah, HAL_DEBUG_DFS, "%s: rssi=%d, dur=%d\n", __func__, rssi, dur);
/* Single-channel only */
pri_found = 1;
ext_found = 0;
}
/*
* If doing extended channel data, pulse_bw_info must
* have one of the flags set.
*/
if (doDfsExtCh && pulse_bw_info == 0x0)
return AH_FALSE;
/*
* If the extended channel data is available, calculate
* which to pay attention to.
*/
if (doDfsExtCh) {
/* If pulse is on DC, take the larger duration of the two */
if ((pulse_bw_info & EXT_CH_RADAR_FOUND) &&
(pulse_bw_info & PRI_CH_RADAR_FOUND)) {
is_dc = 1;
if (pulse_length_ext > pulse_length_pri) {
dur = pulse_length_ext;
pri_found = 0;
ext_found = 1;
} else {
dur = pulse_length_pri;
pri_found = 1;
ext_found = 0;
}
} else if (pulse_bw_info & EXT_CH_RADAR_EARLY_FOUND) {
dur = pulse_length_ext;
pri_found = 0;
ext_found = 1;
early_ext = 1;
} else if (pulse_bw_info & PRI_CH_RADAR_FOUND) {
dur = pulse_length_pri;
pri_found = 1;
ext_found = 0;
} else if (pulse_bw_info & EXT_CH_RADAR_FOUND) {
dur = pulse_length_ext;
pri_found = 0;
ext_found = 1;
}
}
/*
* For enhanced DFS (Merlin and later), pulse_bw_info has
* implications for selecting the correct RSSI value.
*/
if (doDfsEnhanced) {
switch (pulse_bw_info & 0x03) {
case 0:
/* No radar? */
rssi = 0;
break;
case PRI_CH_RADAR_FOUND:
/* Radar in primary channel */
/* Cannot use ctrl channel RSSI if ext channel is stronger */
if (ext_rssi >= (rssi + 3)) {
rssi = 0;
}
break;
case EXT_CH_RADAR_FOUND:
/* Radar in extended channel */
/* Cannot use ext channel RSSI if ctrl channel is stronger */
if (rssi >= (ext_rssi + 12)) {
rssi = 0;
} else {
rssi = ext_rssi;
}
break;
case (PRI_CH_RADAR_FOUND | EXT_CH_RADAR_FOUND):
/* When both are present, use stronger one */
if (rssi < ext_rssi)
rssi = ext_rssi;
break;
}
}
/*
* If not doing enhanced DFS, choose the ext channel if
* it is stronger than the main channel
*/
if (doDfsExtCh && !doDfsEnhanced) {
if ((ext_rssi > rssi) && (ext_rssi < 128))
rssi = ext_rssi;
}
/*
* XXX what happens if the above code decides the RSSI
* XXX wasn't valid, an sets it to 0?
*/
/*
* Fill out dfs_event structure.
*/
event->re_full_ts = fulltsf;
event->re_ts = rxs->rs_tstamp;
event->re_rssi = rssi;
event->re_dur = dur;
event->re_flags = 0;
if (pri_found)
event->re_flags |= HAL_DFS_EVENT_PRICH;
if (ext_found)
event->re_flags |= HAL_DFS_EVENT_EXTCH;
if (early_ext)
event->re_flags |= HAL_DFS_EVENT_EXTEARLY;
if (is_dc)
event->re_flags |= HAL_DFS_EVENT_ISDC;
return AH_TRUE;
}
void
ar9300_attach_freebsd_ops(struct ath_hal *ah)
{
@ -220,7 +415,7 @@ ar9300_attach_freebsd_ops(struct ath_hal *ah)
ah->ah_enableDfs = ar9300_enable_dfs;
ah->ah_getDfsThresh = ar9300_get_dfs_thresh;
ah->ah_getDfsDefaultThresh = ar9300_get_default_dfs_thresh;
// procradarevent
ah->ah_procRadarEvent = ar9300_freebsd_proc_radar_event;
ah->ah_isFastClockEnabled = ar9300_is_fast_clock_enabled;
ah->ah_get11nExtBusy = ar9300_get_11n_ext_busy;