1 /*
2 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
3 * Copyright (c) 2002-2008 Atheros Communications, Inc.
4 *
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.
8 *
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.
16 *
17 * $Id: ar5416_beacon.c,v 1.2 2013/09/12 12:08:49 martin Exp $
18 */
19 #include "opt_ah.h"
20
21 #include "ah.h"
22 #include "ah_internal.h"
23
24 #include "ar5416/ar5416.h"
25 #include "ar5416/ar5416reg.h"
26 #include "ar5416/ar5416phy.h"
27
28 #define TU_TO_USEC(_tu) ((_tu) << 10)
29
30 /*
31 * Initialize all of the hardware registers used to
32 * send beacons. Note that for station operation the
33 * driver calls ar5416SetStaBeaconTimers instead.
34 */
35 void
ar5416SetBeaconTimers(struct ath_hal * ah,const HAL_BEACON_TIMERS * bt)36 ar5416SetBeaconTimers(struct ath_hal *ah, const HAL_BEACON_TIMERS *bt)
37 {
38 uint32_t bperiod;
39
40 OS_REG_WRITE(ah, AR_NEXT_TBTT, TU_TO_USEC(bt->bt_nexttbtt));
41 OS_REG_WRITE(ah, AR_NEXT_DBA, TU_TO_USEC(bt->bt_nextdba) >> 3);
42 OS_REG_WRITE(ah, AR_NEXT_SWBA, TU_TO_USEC(bt->bt_nextswba) >> 3);
43 OS_REG_WRITE(ah, AR_NEXT_NDP, TU_TO_USEC(bt->bt_nextatim));
44
45 bperiod = TU_TO_USEC(bt->bt_intval & HAL_BEACON_PERIOD);
46 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, bperiod);
47 OS_REG_WRITE(ah, AR_DBA_PERIOD, bperiod);
48 OS_REG_WRITE(ah, AR_SWBA_PERIOD, bperiod);
49 OS_REG_WRITE(ah, AR_NDP_PERIOD, bperiod);
50
51 /*
52 * Reset TSF if required.
53 */
54 if (bt->bt_intval & AR_BEACON_RESET_TSF)
55 ar5416ResetTsf(ah);
56
57 /* enable timers */
58 /* NB: flags == 0 handled specially for backwards compatibility */
59 OS_REG_SET_BIT(ah, AR_TIMER_MODE,
60 bt->bt_flags != 0 ? bt->bt_flags :
61 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_DBA | AR_TIMER_MODE_SWBA);
62 }
63
64 /*
65 * Initializes all of the hardware registers used to
66 * send beacons. Note that for station operation the
67 * driver calls ar5212SetStaBeaconTimers instead.
68 */
69 void
ar5416BeaconInit(struct ath_hal * ah,uint32_t next_beacon,uint32_t beacon_period)70 ar5416BeaconInit(struct ath_hal *ah,
71 uint32_t next_beacon, uint32_t beacon_period)
72 {
73 HAL_BEACON_TIMERS bt;
74
75 bt.bt_nexttbtt = next_beacon;
76 /*
77 * TIMER1: in AP/adhoc mode this controls the DMA beacon
78 * alert timer; otherwise it controls the next wakeup time.
79 * TIMER2: in AP mode, it controls the SBA beacon alert
80 * interrupt; otherwise it sets the start of the next CFP.
81 */
82 bt.bt_flags = 0;
83 switch (AH_PRIVATE(ah)->ah_opmode) {
84 case HAL_M_STA:
85 case HAL_M_MONITOR:
86 bt.bt_nextdba = 0xffff;
87 bt.bt_nextswba = 0x7ffff;
88 bt.bt_flags |= AR_TIMER_MODE_TBTT;
89 break;
90 case HAL_M_IBSS:
91 OS_REG_SET_BIT(ah, AR_TXCFG, AR_TXCFG_ATIM_TXPOLICY);
92 bt.bt_flags |= AR_TIMER_MODE_NDP;
93 /* fall thru... */
94 case HAL_M_HOSTAP:
95 bt.bt_nextdba = (next_beacon -
96 ath_hal_dma_beacon_response_time) << 3; /* 1/8 TU */
97 bt.bt_nextswba = (next_beacon -
98 ath_hal_sw_beacon_response_time) << 3; /* 1/8 TU */
99 bt.bt_flags |= AR_TIMER_MODE_TBTT
100 | AR_TIMER_MODE_DBA
101 | AR_TIMER_MODE_SWBA;
102 break;
103 }
104 /*
105 * Set the ATIM window
106 * Our hardware does not support an ATIM window of 0
107 * (beacons will not work). If the ATIM windows is 0,
108 * force it to 1.
109 */
110 bt.bt_nextatim = next_beacon + 1;
111 bt.bt_intval = beacon_period &
112 (AR_BEACON_PERIOD | AR_BEACON_RESET_TSF | AR_BEACON_EN);
113 ar5416SetBeaconTimers(ah, &bt);
114 }
115
116 #define AR_BEACON_PERIOD_MAX 0xffff
117
118 void
ar5416ResetStaBeaconTimers(struct ath_hal * ah)119 ar5416ResetStaBeaconTimers(struct ath_hal *ah)
120 {
121 uint32_t val;
122
123 OS_REG_WRITE(ah, AR_NEXT_TBTT, 0); /* no beacons */
124 val = OS_REG_READ(ah, AR_STA_ID1);
125 val |= AR_STA_ID1_PWR_SAV; /* XXX */
126 /* tell the h/w that the associated AP is not PCF capable */
127 OS_REG_WRITE(ah, AR_STA_ID1,
128 val & ~(AR_STA_ID1_USE_DEFANT | AR_STA_ID1_PCF));
129 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, AR_BEACON_PERIOD_MAX);
130 OS_REG_WRITE(ah, AR_DBA_PERIOD, AR_BEACON_PERIOD_MAX);
131 }
132
133 /*
134 * Set all the beacon related bits on the h/w for stations
135 * i.e. initializes the corresponding h/w timers;
136 * also tells the h/w whether to anticipate PCF beacons
137 */
138 void
ar5416SetStaBeaconTimers(struct ath_hal * ah,const HAL_BEACON_STATE * bs)139 ar5416SetStaBeaconTimers(struct ath_hal *ah, const HAL_BEACON_STATE *bs)
140 {
141 uint32_t nextTbtt,beaconintval, dtimperiod;
142
143 HALASSERT(bs->bs_intval != 0);
144
145 /* NB: no cfp setting since h/w automatically takes care */
146
147 OS_REG_WRITE(ah, AR_NEXT_TBTT, bs->bs_nexttbtt);
148
149 /*
150 * Start the beacon timers by setting the BEACON register
151 * to the beacon interval; no need to write tim offset since
152 * h/w parses IEs.
153 */
154 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD,
155 TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD));
156 OS_REG_WRITE(ah, AR_DBA_PERIOD,
157 TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD));
158
159 /*
160 * Configure the BMISS interrupt. Note that we
161 * assume the caller blocks interrupts while enabling
162 * the threshold.
163 */
164 HALASSERT(bs->bs_bmissthreshold <=
165 (AR_RSSI_THR_BM_THR >> AR_RSSI_THR_BM_THR_S));
166 OS_REG_RMW_FIELD(ah, AR_RSSI_THR,
167 AR_RSSI_THR_BM_THR, bs->bs_bmissthreshold);
168
169 /*
170 * Program the sleep registers to correlate with the beacon setup.
171 */
172
173 /*
174 * Oahu beacons timers on the station were used for power
175 * save operation (waking up in anticipation of a beacon)
176 * and any CFP function; Venice does sleep/power-save timers
177 * differently - so this is the right place to set them up;
178 * don't think the beacon timers are used by venice sta hw
179 * for any useful purpose anymore
180 * Setup venice's sleep related timers
181 * Current implementation assumes sw processing of beacons -
182 * assuming an interrupt is generated every beacon which
183 * causes the hardware to become awake until the sw tells
184 * it to go to sleep again; beacon timeout is to allow for
185 * beacon jitter; cab timeout is max time to wait for cab
186 * after seeing the last DTIM or MORE CAB bit
187 */
188 #define CAB_TIMEOUT_VAL 10 /* in TU */
189 #define BEACON_TIMEOUT_VAL 10 /* in TU */
190 #define SLEEP_SLOP 3 /* in TU */
191
192 /*
193 * For max powersave mode we may want to sleep for longer than a
194 * beacon period and not want to receive all beacons; modify the
195 * timers accordingly; make sure to align the next TIM to the
196 * next DTIM if we decide to wake for DTIMs only
197 */
198 beaconintval = bs->bs_intval & HAL_BEACON_PERIOD;
199 HALASSERT(beaconintval != 0);
200 if (bs->bs_sleepduration > beaconintval) {
201 HALASSERT(roundup(bs->bs_sleepduration, beaconintval) ==
202 bs->bs_sleepduration);
203 beaconintval = bs->bs_sleepduration;
204 }
205 dtimperiod = bs->bs_dtimperiod;
206 if (bs->bs_sleepduration > dtimperiod) {
207 HALASSERT(dtimperiod == 0 ||
208 roundup(bs->bs_sleepduration, dtimperiod) ==
209 bs->bs_sleepduration);
210 dtimperiod = bs->bs_sleepduration;
211 }
212 HALASSERT(beaconintval <= dtimperiod);
213 if (beaconintval == dtimperiod)
214 nextTbtt = bs->bs_nextdtim;
215 else
216 nextTbtt = bs->bs_nexttbtt;
217
218 OS_REG_WRITE(ah, AR_NEXT_DTIM,
219 TU_TO_USEC(bs->bs_nextdtim - SLEEP_SLOP));
220 OS_REG_WRITE(ah, AR_NEXT_TIM, TU_TO_USEC(nextTbtt - SLEEP_SLOP));
221
222 /* cab timeout is now in 1/8 TU */
223 OS_REG_WRITE(ah, AR_SLEEP1,
224 SM((CAB_TIMEOUT_VAL << 3), AR5416_SLEEP1_CAB_TIMEOUT)
225 | AR_SLEEP1_ASSUME_DTIM);
226 /* beacon timeout is now in 1/8 TU */
227 OS_REG_WRITE(ah, AR_SLEEP2,
228 SM((BEACON_TIMEOUT_VAL << 3), AR5416_SLEEP2_BEACON_TIMEOUT));
229
230 OS_REG_WRITE(ah, AR_TIM_PERIOD, beaconintval);
231 OS_REG_WRITE(ah, AR_DTIM_PERIOD, dtimperiod);
232 OS_REG_SET_BIT(ah, AR_TIMER_MODE,
233 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_TIM | AR_TIMER_MODE_DTIM);
234 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next DTIM %d\n",
235 __func__, bs->bs_nextdtim);
236 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next beacon %d\n",
237 __func__, nextTbtt);
238 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: beacon period %d\n",
239 __func__, beaconintval);
240 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: DTIM period %d\n",
241 __func__, dtimperiod);
242 #undef CAB_TIMEOUT_VAL
243 #undef BEACON_TIMEOUT_VAL
244 #undef SLEEP_SLOP
245 }
246