1 /*- 2 * SPDX-License-Identifier: ISC 3 * 4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 5 * Copyright (c) 2002-2004 Atheros Communications, Inc. 6 * 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. 10 * 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. 18 * 19 * $FreeBSD$ 20 */ 21 #include "opt_ah.h" 22 23 #include "ah.h" 24 #include "ah_internal.h" 25 #include "ah_desc.h" 26 27 #include "ar5210/ar5210.h" 28 #include "ar5210/ar5210reg.h" 29 #include "ar5210/ar5210desc.h" 30 31 /* 32 * Return the hardware NextTBTT in TSF 33 */ 34 uint64_t 35 ar5210GetNextTBTT(struct ath_hal *ah) 36 { 37 #define TU_TO_TSF(_tu) (((uint64_t)(_tu)) << 10) 38 return TU_TO_TSF(OS_REG_READ(ah, AR_TIMER0)); 39 #undef TU_TO_TSF 40 } 41 42 /* 43 * Initialize all of the hardware registers used to send beacons. 44 */ 45 void 46 ar5210SetBeaconTimers(struct ath_hal *ah, const HAL_BEACON_TIMERS *bt) 47 { 48 49 OS_REG_WRITE(ah, AR_TIMER0, bt->bt_nexttbtt); 50 OS_REG_WRITE(ah, AR_TIMER1, bt->bt_nextdba); 51 OS_REG_WRITE(ah, AR_TIMER2, bt->bt_nextswba); 52 OS_REG_WRITE(ah, AR_TIMER3, bt->bt_nextatim); 53 /* 54 * Set the Beacon register after setting all timers. 55 */ 56 OS_REG_WRITE(ah, AR_BEACON, bt->bt_intval); 57 } 58 59 /* 60 * Legacy api to Initialize all of the beacon registers. 61 */ 62 void 63 ar5210BeaconInit(struct ath_hal *ah, 64 uint32_t next_beacon, uint32_t beacon_period) 65 { 66 HAL_BEACON_TIMERS bt; 67 68 bt.bt_nexttbtt = next_beacon; 69 70 if (AH_PRIVATE(ah)->ah_opmode != HAL_M_STA) { 71 bt.bt_nextdba = (next_beacon - 72 ah->ah_config.ah_dma_beacon_response_time) << 3; /* 1/8 TU */ 73 bt.bt_nextswba = (next_beacon - 74 ah->ah_config.ah_sw_beacon_response_time) << 3; /* 1/8 TU */ 75 /* 76 * The SWBA interrupt is not used for beacons in ad hoc mode 77 * as we don't yet support ATIMs. So since the beacon never 78 * changes, the beacon descriptor is set up once and read 79 * into a special HW buffer, from which it will be 80 * automagically retrieved at each DMA Beacon Alert (DBA). 81 */ 82 83 /* Set the ATIM window */ 84 bt.bt_nextatim = next_beacon + 0; /* NB: no ATIMs */ 85 } else { 86 bt.bt_nextdba = ~0; 87 bt.bt_nextswba = ~0; 88 bt.bt_nextatim = 1; 89 } 90 bt.bt_intval = beacon_period & 91 (AR_BEACON_PERIOD | AR_BEACON_RESET_TSF | AR_BEACON_EN); 92 ar5210SetBeaconTimers(ah, &bt); 93 } 94 95 void 96 ar5210ResetStaBeaconTimers(struct ath_hal *ah) 97 { 98 uint32_t val; 99 100 OS_REG_WRITE(ah, AR_TIMER0, 0); /* no beacons */ 101 val = OS_REG_READ(ah, AR_STA_ID1); 102 val |= AR_STA_ID1_NO_PSPOLL; /* XXX */ 103 /* tell the h/w that the associated AP is not PCF capable */ 104 OS_REG_WRITE(ah, AR_STA_ID1, 105 val & ~(AR_STA_ID1_DEFAULT_ANTENNA | AR_STA_ID1_PCF)); 106 OS_REG_WRITE(ah, AR_BEACON, AR_BEACON_PERIOD); 107 } 108 109 /* 110 * Set all the beacon related bits on the h/w for stations 111 * i.e. initializes the corresponding h/w timers; 112 * also tells the h/w whether to anticipate PCF beacons 113 * 114 * dtim_count and cfp_count from the current beacon - their current 115 * values aren't necessarily maintained in the device struct 116 */ 117 void 118 ar5210SetStaBeaconTimers(struct ath_hal *ah, const HAL_BEACON_STATE *bs) 119 { 120 struct ath_hal_5210 *ahp = AH5210(ah); 121 122 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: setting beacon timers\n", __func__); 123 124 HALASSERT(bs->bs_intval != 0); 125 /* if the AP will do PCF */ 126 if (bs->bs_cfpmaxduration != 0) { 127 /* tell the h/w that the associated AP is PCF capable */ 128 OS_REG_WRITE(ah, AR_STA_ID1, 129 (OS_REG_READ(ah, AR_STA_ID1) &~ AR_STA_ID1_DEFAULT_ANTENNA) 130 | AR_STA_ID1_PCF); 131 132 /* set CFP_PERIOD(1.024ms) register */ 133 OS_REG_WRITE(ah, AR_CFP_PERIOD, bs->bs_cfpperiod); 134 135 /* set CFP_DUR(1.024ms) register to max cfp duration */ 136 OS_REG_WRITE(ah, AR_CFP_DUR, bs->bs_cfpmaxduration); 137 138 /* set TIMER2(128us) to anticipated time of next CFP */ 139 OS_REG_WRITE(ah, AR_TIMER2, bs->bs_cfpnext << 3); 140 } else { 141 /* tell the h/w that the associated AP is not PCF capable */ 142 OS_REG_WRITE(ah, AR_STA_ID1, 143 OS_REG_READ(ah, AR_STA_ID1) &~ (AR_STA_ID1_DEFAULT_ANTENNA | AR_STA_ID1_PCF)); 144 } 145 146 /* 147 * Set TIMER0(1.024ms) to the anticipated time of the next beacon. 148 */ 149 OS_REG_WRITE(ah, AR_TIMER0, bs->bs_nexttbtt); 150 151 /* 152 * Start the beacon timers by setting the BEACON register 153 * to the beacon interval; also write the tim offset which 154 * we should know by now. The code, in ar5211WriteAssocid, 155 * also sets the tim offset once the AID is known which can 156 * be left as such for now. 157 */ 158 OS_REG_WRITE(ah, AR_BEACON, 159 (OS_REG_READ(ah, AR_BEACON) &~ (AR_BEACON_PERIOD|AR_BEACON_TIM)) 160 | SM(bs->bs_intval, AR_BEACON_PERIOD) 161 | SM(bs->bs_timoffset ? bs->bs_timoffset + 4 : 0, AR_BEACON_TIM) 162 ); 163 164 /* 165 * Configure the BMISS interrupt. Note that we 166 * assume the caller blocks interrupts while enabling 167 * the threshold. 168 */ 169 170 /* 171 * Interrupt works only on Crete. 172 */ 173 if (AH_PRIVATE(ah)->ah_macRev < AR_SREV_CRETE) 174 return; 175 /* 176 * Counter is only 3-bits. 177 * Count of 0 with BMISS interrupt enabled will hang the system 178 * with too many interrupts 179 */ 180 if (AH_PRIVATE(ah)->ah_macRev >= AR_SREV_CRETE && 181 (bs->bs_bmissthreshold&7) == 0) { 182 #ifdef AH_DEBUG 183 ath_hal_printf(ah, "%s: invalid beacon miss threshold %u\n", 184 __func__, bs->bs_bmissthreshold); 185 #endif 186 return; 187 } 188 #define BMISS_MAX (AR_RSSI_THR_BM_THR >> AR_RSSI_THR_BM_THR_S) 189 /* 190 * Configure the BMISS interrupt. Note that we 191 * assume the caller blocks interrupts while enabling 192 * the threshold. 193 * 194 * NB: the beacon miss count field is only 3 bits which 195 * is much smaller than what's found on later parts; 196 * clamp overflow values as a safeguard. 197 */ 198 ahp->ah_rssiThr = (ahp->ah_rssiThr &~ AR_RSSI_THR_BM_THR) 199 | SM(bs->bs_bmissthreshold > BMISS_MAX ? 200 BMISS_MAX : bs->bs_bmissthreshold, 201 AR_RSSI_THR_BM_THR); 202 OS_REG_WRITE(ah, AR_RSSI_THR, ahp->ah_rssiThr); 203 #undef BMISS_MAX 204 } 205