2 * SPDX-License-Identifier: ISC
4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
5 * Copyright (c) 2002-2008 Atheros Communications, Inc.
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
24 #include "ah_internal.h"
26 #include "ar5416/ar5416.h"
27 #include "ar5416/ar5416reg.h"
28 #include "ar5416/ar5416phy.h"
30 #define TU_TO_USEC(_tu) ((_tu) << 10)
31 #define ONE_EIGHTH_TU_TO_USEC(_tu8) ((_tu8) << 7)
34 * Return the hardware NextTBTT in TSF
37 ar5416GetNextTBTT(struct ath_hal *ah)
39 return OS_REG_READ(ah, AR_NEXT_TBTT);
43 * Initialize all of the hardware registers used to
44 * send beacons. Note that for station operation the
45 * driver calls ar5416SetStaBeaconTimers instead.
48 ar5416SetBeaconTimers(struct ath_hal *ah, const HAL_BEACON_TIMERS *bt)
51 struct ath_hal_5212 *ahp = AH5212(ah);
53 OS_REG_WRITE(ah, AR_NEXT_TBTT, TU_TO_USEC(bt->bt_nexttbtt));
54 OS_REG_WRITE(ah, AR_NEXT_DBA, ONE_EIGHTH_TU_TO_USEC(bt->bt_nextdba));
55 OS_REG_WRITE(ah, AR_NEXT_SWBA, ONE_EIGHTH_TU_TO_USEC(bt->bt_nextswba));
56 OS_REG_WRITE(ah, AR_NEXT_NDP, TU_TO_USEC(bt->bt_nextatim));
58 bperiod = TU_TO_USEC(bt->bt_intval & HAL_BEACON_PERIOD);
59 ahp->ah_beaconInterval = bt->bt_intval & HAL_BEACON_PERIOD;
60 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, bperiod);
61 OS_REG_WRITE(ah, AR_DBA_PERIOD, bperiod);
62 OS_REG_WRITE(ah, AR_SWBA_PERIOD, bperiod);
63 OS_REG_WRITE(ah, AR_NDP_PERIOD, bperiod);
66 * Reset TSF if required.
68 if (bt->bt_intval & AR_BEACON_RESET_TSF)
72 /* NB: flags == 0 handled specially for backwards compatibility */
73 OS_REG_SET_BIT(ah, AR_TIMER_MODE,
74 bt->bt_flags != 0 ? bt->bt_flags :
75 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_DBA | AR_TIMER_MODE_SWBA);
79 * Initializes all of the hardware registers used to
80 * send beacons. Note that for station operation the
81 * driver calls ar5212SetStaBeaconTimers instead.
84 ar5416BeaconInit(struct ath_hal *ah,
85 uint32_t next_beacon, uint32_t beacon_period)
89 bt.bt_nexttbtt = next_beacon;
91 * TIMER1: in AP/adhoc mode this controls the DMA beacon
92 * alert timer; otherwise it controls the next wakeup time.
93 * TIMER2: in AP mode, it controls the SBA beacon alert
94 * interrupt; otherwise it sets the start of the next CFP.
97 switch (AH_PRIVATE(ah)->ah_opmode) {
100 bt.bt_nextdba = 0xffff;
101 bt.bt_nextswba = 0x7ffff;
102 bt.bt_flags |= AR_TIMER_MODE_TBTT;
105 OS_REG_SET_BIT(ah, AR_TXCFG, AR_TXCFG_ATIM_TXPOLICY);
106 bt.bt_flags |= AR_TIMER_MODE_NDP;
109 bt.bt_nextdba = (next_beacon -
110 ah->ah_config.ah_dma_beacon_response_time) << 3; /* 1/8 TU */
111 bt.bt_nextswba = (next_beacon -
112 ah->ah_config.ah_sw_beacon_response_time) << 3; /* 1/8 TU */
113 bt.bt_flags |= AR_TIMER_MODE_TBTT
115 | AR_TIMER_MODE_SWBA;
119 * Set the ATIM window
120 * Our hardware does not support an ATIM window of 0
121 * (beacons will not work). If the ATIM windows is 0,
124 bt.bt_nextatim = next_beacon + 1;
125 bt.bt_intval = beacon_period &
126 (AR_BEACON_PERIOD | AR_BEACON_RESET_TSF | AR_BEACON_EN);
127 ar5416SetBeaconTimers(ah, &bt);
130 #define AR_BEACON_PERIOD_MAX 0xffff
133 ar5416ResetStaBeaconTimers(struct ath_hal *ah)
137 OS_REG_WRITE(ah, AR_NEXT_TBTT, 0); /* no beacons */
138 val = OS_REG_READ(ah, AR_STA_ID1);
139 val |= AR_STA_ID1_PWR_SAV; /* XXX */
140 /* tell the h/w that the associated AP is not PCF capable */
141 OS_REG_WRITE(ah, AR_STA_ID1,
142 val & ~(AR_STA_ID1_USE_DEFANT | AR_STA_ID1_PCF));
143 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, AR_BEACON_PERIOD_MAX);
144 OS_REG_WRITE(ah, AR_DBA_PERIOD, AR_BEACON_PERIOD_MAX);
148 * Set all the beacon related bits on the h/w for stations
149 * i.e. initializes the corresponding h/w timers;
150 * also tells the h/w whether to anticipate PCF beacons
153 ar5416SetStaBeaconTimers(struct ath_hal *ah, const HAL_BEACON_STATE *bs)
155 uint32_t nextTbtt, nextdtim,beaconintval, dtimperiod;
157 HALASSERT(bs->bs_intval != 0);
159 /* NB: no cfp setting since h/w automatically takes care */
161 OS_REG_WRITE(ah, AR_NEXT_TBTT, TU_TO_USEC(bs->bs_nexttbtt));
164 * Start the beacon timers by setting the BEACON register
165 * to the beacon interval; no need to write tim offset since
168 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD,
169 TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD));
170 OS_REG_WRITE(ah, AR_DBA_PERIOD,
171 TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD));
174 * Configure the BMISS interrupt. Note that we
175 * assume the caller blocks interrupts while enabling
178 HALASSERT(bs->bs_bmissthreshold <=
179 (AR_RSSI_THR_BM_THR >> AR_RSSI_THR_BM_THR_S));
180 OS_REG_RMW_FIELD(ah, AR_RSSI_THR,
181 AR_RSSI_THR_BM_THR, bs->bs_bmissthreshold);
184 * Program the sleep registers to correlate with the beacon setup.
188 * Oahu beacons timers on the station were used for power
189 * save operation (waking up in anticipation of a beacon)
190 * and any CFP function; Venice does sleep/power-save timers
191 * differently - so this is the right place to set them up;
192 * don't think the beacon timers are used by venice sta hw
193 * for any useful purpose anymore
194 * Setup venice's sleep related timers
195 * Current implementation assumes sw processing of beacons -
196 * assuming an interrupt is generated every beacon which
197 * causes the hardware to become awake until the sw tells
198 * it to go to sleep again; beacon timeout is to allow for
199 * beacon jitter; cab timeout is max time to wait for cab
200 * after seeing the last DTIM or MORE CAB bit
204 * I've bumped these to 30TU for now.
206 * Some APs (AR933x/AR934x?) in 2GHz especially seem to not always
207 * transmit beacon frames at exactly the right times and with it set
208 * to 10TU, the NIC starts not waking up at the right times to hear
209 * these slightly-larger-jitering beacons. It also never recovers
210 * from that (it doesn't resync? I'm not sure.)
212 * So for now bump this to 30TU. Ideally we'd cap this based on
213 * the beacon interval so the sum of CAB+BEACON timeouts never
214 * exceeded the beacon interval.
216 * Now, since we're doing all the math in the ath(4) driver in TU
217 * rather than TSF, we may be seeing the result of dumb rounding
218 * errors causing the jitter to actually be a much bigger problem.
219 * I'll have to investigate that with a fine tooth comb.
221 #define CAB_TIMEOUT_VAL 10 /* in TU */
222 #define BEACON_TIMEOUT_VAL 10 /* in TU */
223 #define SLEEP_SLOP 3 /* in TU */
226 * For max powersave mode we may want to sleep for longer than a
227 * beacon period and not want to receive all beacons; modify the
228 * timers accordingly; make sure to align the next TIM to the
229 * next DTIM if we decide to wake for DTIMs only
231 beaconintval = bs->bs_intval & HAL_BEACON_PERIOD;
232 HALASSERT(beaconintval != 0);
233 if (bs->bs_sleepduration > beaconintval) {
234 HALASSERT(roundup(bs->bs_sleepduration, beaconintval) ==
235 bs->bs_sleepduration);
236 beaconintval = bs->bs_sleepduration;
238 dtimperiod = bs->bs_dtimperiod;
239 if (bs->bs_sleepduration > dtimperiod) {
240 HALASSERT(dtimperiod == 0 ||
241 roundup(bs->bs_sleepduration, dtimperiod) ==
242 bs->bs_sleepduration);
243 dtimperiod = bs->bs_sleepduration;
245 HALASSERT(beaconintval <= dtimperiod);
246 if (beaconintval == dtimperiod)
247 nextTbtt = bs->bs_nextdtim;
249 nextTbtt = bs->bs_nexttbtt;
250 nextdtim = bs->bs_nextdtim;
252 OS_REG_WRITE(ah, AR_NEXT_DTIM,
253 TU_TO_USEC(bs->bs_nextdtim - SLEEP_SLOP));
254 OS_REG_WRITE(ah, AR_NEXT_TIM, TU_TO_USEC(nextTbtt - SLEEP_SLOP));
256 /* cab timeout is now in 1/8 TU */
257 OS_REG_WRITE(ah, AR5416_SLEEP1,
258 SM((CAB_TIMEOUT_VAL << 3), AR5416_SLEEP1_CAB_TIMEOUT)
259 | AR5416_SLEEP1_ASSUME_DTIM);
261 /* XXX autosleep? Use min beacon timeout; check ath9k -adrian */
262 /* beacon timeout is now in 1/8 TU */
263 OS_REG_WRITE(ah, AR5416_SLEEP2,
264 SM((BEACON_TIMEOUT_VAL << 3), AR5416_SLEEP2_BEACON_TIMEOUT));
266 /* TIM_PERIOD and DTIM_PERIOD are now in uS. */
267 OS_REG_WRITE(ah, AR_TIM_PERIOD, TU_TO_USEC(beaconintval));
268 OS_REG_WRITE(ah, AR_DTIM_PERIOD, TU_TO_USEC(dtimperiod));
270 OS_REG_SET_BIT(ah, AR_TIMER_MODE,
271 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_TIM | AR_TIMER_MODE_DTIM);
273 #define HAL_TSFOOR_THRESHOLD 0x00004240 /* TSF OOR threshold (16k us) */
275 /* TSF out of range threshold */
276 // OS_REG_WRITE(ah, AR_TSFOOR_THRESHOLD, bs->bs_tsfoor_threshold);
277 OS_REG_WRITE(ah, AR_TSFOOR_THRESHOLD, HAL_TSFOOR_THRESHOLD);
279 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next DTIM %d\n",
280 __func__, bs->bs_nextdtim);
281 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next beacon %d\n",
283 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: beacon period %d\n",
284 __func__, beaconintval);
285 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: DTIM period %d\n",
286 __func__, dtimperiod);
287 #undef CAB_TIMEOUT_VAL
288 #undef BEACON_TIMEOUT_VAL