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 1.1.1.1 2008/12/11 04:46:47 alc 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 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 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 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 139 ar5416SetStaBeaconTimers(struct ath_hal *ah, const HAL_BEACON_STATE *bs) 140 { 141 uint32_t nextTbtt, nextdtim,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 nextdtim = bs->bs_nextdtim; 218 219 OS_REG_WRITE(ah, AR_NEXT_DTIM, 220 TU_TO_USEC(bs->bs_nextdtim - SLEEP_SLOP)); 221 OS_REG_WRITE(ah, AR_NEXT_TIM, TU_TO_USEC(nextTbtt - SLEEP_SLOP)); 222 223 /* cab timeout is now in 1/8 TU */ 224 OS_REG_WRITE(ah, AR_SLEEP1, 225 SM((CAB_TIMEOUT_VAL << 3), AR5416_SLEEP1_CAB_TIMEOUT) 226 | AR_SLEEP1_ASSUME_DTIM); 227 /* beacon timeout is now in 1/8 TU */ 228 OS_REG_WRITE(ah, AR_SLEEP2, 229 SM((BEACON_TIMEOUT_VAL << 3), AR5416_SLEEP2_BEACON_TIMEOUT)); 230 231 OS_REG_WRITE(ah, AR_TIM_PERIOD, beaconintval); 232 OS_REG_WRITE(ah, AR_DTIM_PERIOD, dtimperiod); 233 OS_REG_SET_BIT(ah, AR_TIMER_MODE, 234 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_TIM | AR_TIMER_MODE_DTIM); 235 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next DTIM %d\n", 236 __func__, bs->bs_nextdtim); 237 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next beacon %d\n", 238 __func__, nextTbtt); 239 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: beacon period %d\n", 240 __func__, beaconintval); 241 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: DTIM period %d\n", 242 __func__, dtimperiod); 243 #undef CAB_TIMEOUT_VAL 244 #undef BEACON_TIMEOUT_VAL 245 #undef SLEEP_SLOP 246 } 247