ar5416_beacon.c revision 225444
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 * $FreeBSD: head/sys/dev/ath/ath_hal/ar5416/ar5416_beacon.c 225444 2011-09-08 01:23:05Z adrian $ 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#define ONE_EIGHTH_TU_TO_USEC(_tu8) ((_tu8) << 7) 30 31/* 32 * Return the hardware NextTBTT in TSF 33 */ 34uint64_t 35ar5416GetNextTBTT(struct ath_hal *ah) 36{ 37 return OS_REG_READ(ah, AR_NEXT_TBTT); 38} 39 40/* 41 * Initialize all of the hardware registers used to 42 * send beacons. Note that for station operation the 43 * driver calls ar5416SetStaBeaconTimers instead. 44 */ 45void 46ar5416SetBeaconTimers(struct ath_hal *ah, const HAL_BEACON_TIMERS *bt) 47{ 48 uint32_t bperiod; 49 50 OS_REG_WRITE(ah, AR_NEXT_TBTT, TU_TO_USEC(bt->bt_nexttbtt)); 51 OS_REG_WRITE(ah, AR_NEXT_DBA, ONE_EIGHTH_TU_TO_USEC(bt->bt_nextdba)); 52 OS_REG_WRITE(ah, AR_NEXT_SWBA, ONE_EIGHTH_TU_TO_USEC(bt->bt_nextswba)); 53 OS_REG_WRITE(ah, AR_NEXT_NDP, TU_TO_USEC(bt->bt_nextatim)); 54 55 bperiod = TU_TO_USEC(bt->bt_intval & HAL_BEACON_PERIOD); 56 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, bperiod); 57 OS_REG_WRITE(ah, AR_DBA_PERIOD, bperiod); 58 OS_REG_WRITE(ah, AR_SWBA_PERIOD, bperiod); 59 OS_REG_WRITE(ah, AR_NDP_PERIOD, bperiod); 60 61 /* 62 * Reset TSF if required. 63 */ 64 if (bt->bt_intval & AR_BEACON_RESET_TSF) 65 ar5416ResetTsf(ah); 66 67 /* enable timers */ 68 /* NB: flags == 0 handled specially for backwards compatibility */ 69 OS_REG_SET_BIT(ah, AR_TIMER_MODE, 70 bt->bt_flags != 0 ? bt->bt_flags : 71 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_DBA | AR_TIMER_MODE_SWBA); 72} 73 74/* 75 * Initializes all of the hardware registers used to 76 * send beacons. Note that for station operation the 77 * driver calls ar5212SetStaBeaconTimers instead. 78 */ 79void 80ar5416BeaconInit(struct ath_hal *ah, 81 uint32_t next_beacon, uint32_t beacon_period) 82{ 83 HAL_BEACON_TIMERS bt; 84 85 bt.bt_nexttbtt = next_beacon; 86 /* 87 * TIMER1: in AP/adhoc mode this controls the DMA beacon 88 * alert timer; otherwise it controls the next wakeup time. 89 * TIMER2: in AP mode, it controls the SBA beacon alert 90 * interrupt; otherwise it sets the start of the next CFP. 91 */ 92 bt.bt_flags = 0; 93 switch (AH_PRIVATE(ah)->ah_opmode) { 94 case HAL_M_STA: 95 case HAL_M_MONITOR: 96 bt.bt_nextdba = 0xffff; 97 bt.bt_nextswba = 0x7ffff; 98 bt.bt_flags |= AR_TIMER_MODE_TBTT; 99 break; 100 case HAL_M_IBSS: 101 OS_REG_SET_BIT(ah, AR_TXCFG, AR_TXCFG_ATIM_TXPOLICY); 102 bt.bt_flags |= AR_TIMER_MODE_NDP; 103 /* fall thru... */ 104 case HAL_M_HOSTAP: 105 bt.bt_nextdba = (next_beacon - 106 ah->ah_config.ah_dma_beacon_response_time) << 3; /* 1/8 TU */ 107 bt.bt_nextswba = (next_beacon - 108 ah->ah_config.ah_sw_beacon_response_time) << 3; /* 1/8 TU */ 109 bt.bt_flags |= AR_TIMER_MODE_TBTT 110 | AR_TIMER_MODE_DBA 111 | AR_TIMER_MODE_SWBA; 112 break; 113 } 114 /* 115 * Set the ATIM window 116 * Our hardware does not support an ATIM window of 0 117 * (beacons will not work). If the ATIM windows is 0, 118 * force it to 1. 119 */ 120 bt.bt_nextatim = next_beacon + 1; 121 bt.bt_intval = beacon_period & 122 (AR_BEACON_PERIOD | AR_BEACON_RESET_TSF | AR_BEACON_EN); 123 ar5416SetBeaconTimers(ah, &bt); 124} 125 126#define AR_BEACON_PERIOD_MAX 0xffff 127 128void 129ar5416ResetStaBeaconTimers(struct ath_hal *ah) 130{ 131 uint32_t val; 132 133 OS_REG_WRITE(ah, AR_NEXT_TBTT, 0); /* no beacons */ 134 val = OS_REG_READ(ah, AR_STA_ID1); 135 val |= AR_STA_ID1_PWR_SAV; /* XXX */ 136 /* tell the h/w that the associated AP is not PCF capable */ 137 OS_REG_WRITE(ah, AR_STA_ID1, 138 val & ~(AR_STA_ID1_USE_DEFANT | AR_STA_ID1_PCF)); 139 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, AR_BEACON_PERIOD_MAX); 140 OS_REG_WRITE(ah, AR_DBA_PERIOD, AR_BEACON_PERIOD_MAX); 141} 142 143/* 144 * Set all the beacon related bits on the h/w for stations 145 * i.e. initializes the corresponding h/w timers; 146 * also tells the h/w whether to anticipate PCF beacons 147 */ 148void 149ar5416SetStaBeaconTimers(struct ath_hal *ah, const HAL_BEACON_STATE *bs) 150{ 151 uint32_t nextTbtt, nextdtim,beaconintval, dtimperiod; 152 153 HALASSERT(bs->bs_intval != 0); 154 155 /* NB: no cfp setting since h/w automatically takes care */ 156 157 OS_REG_WRITE(ah, AR_NEXT_TBTT, TU_TO_USEC(bs->bs_nexttbtt)); 158 159 /* 160 * Start the beacon timers by setting the BEACON register 161 * to the beacon interval; no need to write tim offset since 162 * h/w parses IEs. 163 */ 164 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, 165 TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD)); 166 OS_REG_WRITE(ah, AR_DBA_PERIOD, 167 TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD)); 168 169 /* 170 * Configure the BMISS interrupt. Note that we 171 * assume the caller blocks interrupts while enabling 172 * the threshold. 173 */ 174 HALASSERT(bs->bs_bmissthreshold <= 175 (AR_RSSI_THR_BM_THR >> AR_RSSI_THR_BM_THR_S)); 176 OS_REG_RMW_FIELD(ah, AR_RSSI_THR, 177 AR_RSSI_THR_BM_THR, bs->bs_bmissthreshold); 178 179 /* 180 * Program the sleep registers to correlate with the beacon setup. 181 */ 182 183 /* 184 * Oahu beacons timers on the station were used for power 185 * save operation (waking up in anticipation of a beacon) 186 * and any CFP function; Venice does sleep/power-save timers 187 * differently - so this is the right place to set them up; 188 * don't think the beacon timers are used by venice sta hw 189 * for any useful purpose anymore 190 * Setup venice's sleep related timers 191 * Current implementation assumes sw processing of beacons - 192 * assuming an interrupt is generated every beacon which 193 * causes the hardware to become awake until the sw tells 194 * it to go to sleep again; beacon timeout is to allow for 195 * beacon jitter; cab timeout is max time to wait for cab 196 * after seeing the last DTIM or MORE CAB bit 197 */ 198#define CAB_TIMEOUT_VAL 10 /* in TU */ 199#define BEACON_TIMEOUT_VAL 10 /* in TU */ 200#define SLEEP_SLOP 3 /* in TU */ 201 202 /* 203 * For max powersave mode we may want to sleep for longer than a 204 * beacon period and not want to receive all beacons; modify the 205 * timers accordingly; make sure to align the next TIM to the 206 * next DTIM if we decide to wake for DTIMs only 207 */ 208 beaconintval = bs->bs_intval & HAL_BEACON_PERIOD; 209 HALASSERT(beaconintval != 0); 210 if (bs->bs_sleepduration > beaconintval) { 211 HALASSERT(roundup(bs->bs_sleepduration, beaconintval) == 212 bs->bs_sleepduration); 213 beaconintval = bs->bs_sleepduration; 214 } 215 dtimperiod = bs->bs_dtimperiod; 216 if (bs->bs_sleepduration > dtimperiod) { 217 HALASSERT(dtimperiod == 0 || 218 roundup(bs->bs_sleepduration, dtimperiod) == 219 bs->bs_sleepduration); 220 dtimperiod = bs->bs_sleepduration; 221 } 222 HALASSERT(beaconintval <= dtimperiod); 223 if (beaconintval == dtimperiod) 224 nextTbtt = bs->bs_nextdtim; 225 else 226 nextTbtt = bs->bs_nexttbtt; 227 nextdtim = bs->bs_nextdtim; 228 229 OS_REG_WRITE(ah, AR_NEXT_DTIM, 230 TU_TO_USEC(bs->bs_nextdtim - SLEEP_SLOP)); 231 OS_REG_WRITE(ah, AR_NEXT_TIM, TU_TO_USEC(nextTbtt - SLEEP_SLOP)); 232 233 /* cab timeout is now in 1/8 TU */ 234 OS_REG_WRITE(ah, AR5416_SLEEP1, 235 SM((CAB_TIMEOUT_VAL << 3), AR5416_SLEEP1_CAB_TIMEOUT) 236 | AR5416_SLEEP1_ASSUME_DTIM); 237 238 /* XXX autosleep? Use min beacon timeout; check ath9k -adrian */ 239 /* beacon timeout is now in 1/8 TU */ 240 OS_REG_WRITE(ah, AR5416_SLEEP2, 241 SM((BEACON_TIMEOUT_VAL << 3), AR5416_SLEEP2_BEACON_TIMEOUT)); 242 243 /* TIM_PERIOD and DTIM_PERIOD are now in uS. */ 244 OS_REG_WRITE(ah, AR_TIM_PERIOD, TU_TO_USEC(beaconintval)); 245 OS_REG_WRITE(ah, AR_DTIM_PERIOD, TU_TO_USEC(dtimperiod)); 246 247 OS_REG_SET_BIT(ah, AR_TIMER_MODE, 248 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_TIM | AR_TIMER_MODE_DTIM); 249 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next DTIM %d\n", 250 __func__, bs->bs_nextdtim); 251 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next beacon %d\n", 252 __func__, nextTbtt); 253 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: beacon period %d\n", 254 __func__, beaconintval); 255 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: DTIM period %d\n", 256 __func__, dtimperiod); 257#undef CAB_TIMEOUT_VAL 258#undef BEACON_TIMEOUT_VAL 259#undef SLEEP_SLOP 260} 261