2 * Copyright (c) 2008-2011 Atheros Communications Inc.
3 * Copyright (c) 2011 Neratec Solutions AG
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 #include "dfs_debug.h"
25 * TODO: move into or synchronize this with generic header
26 * as soon as IF is defined
28 struct dfs_radar_pulse {
35 /* internal struct to pass radar data */
36 struct ath_radar_data {
44 /* convert pulse duration to usecs, considering clock mode */
45 static u32 dur_to_usecs(struct ath_hw *ah, u32 dur)
47 const u32 AR93X_NSECS_PER_DUR = 800;
48 const u32 AR93X_NSECS_PER_DUR_FAST = (8000 / 11);
51 if (IS_CHAN_A_FAST_CLOCK(ah, ah->curchan))
52 nsecs = dur * AR93X_NSECS_PER_DUR_FAST;
54 nsecs = dur * AR93X_NSECS_PER_DUR;
56 return (nsecs + 500) / 1000;
59 #define PRI_CH_RADAR_FOUND 0x01
60 #define EXT_CH_RADAR_FOUND 0x02
62 ath9k_postprocess_radar_event(struct ath_softc *sc,
63 struct ath_radar_data *are,
64 struct dfs_radar_pulse *drp)
69 ath_dbg(ath9k_hw_common(sc->sc_ah), DFS,
70 "pulse_bw_info=0x%x, pri,ext len/rssi=(%u/%u, %u/%u)\n",
72 are->pulse_length_pri, are->rssi,
73 are->pulse_length_ext, are->ext_rssi);
76 * Only the last 2 bits of the BW info are relevant, they indicate
77 * which channel the radar was detected in.
79 are->pulse_bw_info &= 0x03;
81 switch (are->pulse_bw_info) {
82 case PRI_CH_RADAR_FOUND:
83 /* radar in ctrl channel */
84 dur = are->pulse_length_pri;
85 DFS_STAT_INC(sc, pri_phy_errors);
87 * cannot use ctrl channel RSSI
88 * if extension channel is stronger
90 rssi = (are->ext_rssi >= (are->rssi + 3)) ? 0 : are->rssi;
92 case EXT_CH_RADAR_FOUND:
93 /* radar in extension channel */
94 dur = are->pulse_length_ext;
95 DFS_STAT_INC(sc, ext_phy_errors);
97 * cannot use extension channel RSSI
98 * if control channel is stronger
100 rssi = (are->rssi >= (are->ext_rssi + 12)) ? 0 : are->ext_rssi;
102 case (PRI_CH_RADAR_FOUND | EXT_CH_RADAR_FOUND):
104 * Conducted testing, when pulse is on DC, both pri and ext
105 * durations are reported to be same
107 * Radiated testing, when pulse is on DC, different pri and
108 * ext durations are reported, so take the larger of the two
110 if (are->pulse_length_ext >= are->pulse_length_pri)
111 dur = are->pulse_length_ext;
113 dur = are->pulse_length_pri;
114 DFS_STAT_INC(sc, dc_phy_errors);
116 /* when both are present use stronger one */
117 rssi = (are->rssi < are->ext_rssi) ? are->ext_rssi : are->rssi;
121 * Bogus bandwidth info was received in descriptor,
122 * so ignore this PHY error
124 DFS_STAT_INC(sc, bwinfo_discards);
129 DFS_STAT_INC(sc, rssi_discards);
134 * TODO: check chirping pulses
135 * checks for chirping are dependent on the DFS regulatory domain
136 * used, which is yet TBD
139 /* convert duration to usecs */
140 drp->width = dur_to_usecs(sc->sc_ah, dur);
143 DFS_STAT_INC(sc, pulses_detected);
146 #undef PRI_CH_RADAR_FOUND
147 #undef EXT_CH_RADAR_FOUND
150 * DFS: check PHY-error for radar pulse and feed the detector
152 void ath9k_dfs_process_phyerr(struct ath_softc *sc, void *data,
153 struct ath_rx_status *rs, u64 mactime)
155 struct ath_radar_data ard;
158 struct dfs_radar_pulse drp;
159 struct ath_hw *ah = sc->sc_ah;
160 struct ath_common *common = ath9k_hw_common(ah);
162 if ((!(rs->rs_phyerr != ATH9K_PHYERR_RADAR)) &&
163 (!(rs->rs_phyerr != ATH9K_PHYERR_FALSE_RADAR_EXT))) {
165 "Error: rs_phyer=0x%x not a radar error\n",
170 datalen = rs->rs_datalen;
172 DFS_STAT_INC(sc, datalen_discards);
176 ard.rssi = rs->rs_rssi_ctl0;
177 ard.ext_rssi = rs->rs_rssi_ext0;
180 * hardware stores this as 8 bit signed value.
181 * we will cap it at 0 if it is a negative number
185 if (ard.ext_rssi & 0x80)
188 vdata_end = (char *)data + datalen;
189 ard.pulse_bw_info = vdata_end[-1];
190 ard.pulse_length_ext = vdata_end[-2];
191 ard.pulse_length_pri = vdata_end[-3];
194 "bw_info=%d, length_pri=%d, length_ext=%d, "
195 "rssi_pri=%d, rssi_ext=%d\n",
196 ard.pulse_bw_info, ard.pulse_length_pri, ard.pulse_length_ext,
197 ard.rssi, ard.ext_rssi);
199 drp.freq = ah->curchan->channel;
201 if (ath9k_postprocess_radar_event(sc, &ard, &drp)) {
204 "ath9k_dfs_process_phyerr: channel=%d, ts=%llu, "
205 "width=%d, rssi=%d, delta_ts=%llu\n",
206 drp.freq, drp.ts, drp.width, drp.rssi, drp.ts-last_ts);
209 * TODO: forward pulse to pattern detector
211 * ieee80211_add_radar_pulse(drp.freq, drp.ts,
212 * drp.width, drp.rssi);