Signed-off-by: Oleksij Rempel <linux@rempel-privat.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>tirimbino
Oleksij Rempel
11 years ago
committed by
John W. Linville
parent
a2030b9dbc
commit
cbbdf2ae2d
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/*
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* Copyright (c) 2008-2011 Atheros Communications Inc. |
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* |
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* Permission to use, copy, modify, and/or distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include "common.h" |
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#define FUDGE 2 |
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/* Calculate the modulo of a 64 bit TSF snapshot with a TU divisor */ |
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static u32 ath9k_mod_tsf64_tu(u64 tsf, u32 div_tu) |
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{ |
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u32 tsf_mod, tsf_hi, tsf_lo, mod_hi, mod_lo; |
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tsf_mod = tsf & (BIT(10) - 1); |
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tsf_hi = tsf >> 32; |
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tsf_lo = ((u32) tsf) >> 10; |
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mod_hi = tsf_hi % div_tu; |
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mod_lo = ((mod_hi << 22) + tsf_lo) % div_tu; |
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return (mod_lo << 10) | tsf_mod; |
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} |
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static u32 ath9k_get_next_tbtt(struct ath_hw *ah, u64 tsf, |
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unsigned int interval) |
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{ |
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unsigned int offset; |
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tsf += TU_TO_USEC(FUDGE + ah->config.sw_beacon_response_time); |
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offset = ath9k_mod_tsf64_tu(tsf, interval); |
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return (u32) tsf + TU_TO_USEC(interval) - offset; |
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} |
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/*
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* This sets up the beacon timers according to the timestamp of the last |
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* received beacon and the current TSF, configures PCF and DTIM |
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* handling, programs the sleep registers so the hardware will wakeup in |
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* time to receive beacons, and configures the beacon miss handling so |
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* we'll receive a BMISS interrupt when we stop seeing beacons from the AP |
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* we've associated with. |
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*/ |
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int ath9k_cmn_beacon_config_sta(struct ath_hw *ah, |
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struct ath_beacon_config *conf, |
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struct ath9k_beacon_state *bs) |
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{ |
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struct ath_common *common = ath9k_hw_common(ah); |
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int dtim_intval; |
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u64 tsf; |
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/* No need to configure beacon if we are not associated */ |
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if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags)) { |
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ath_dbg(common, BEACON, |
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"STA is not yet associated..skipping beacon config\n"); |
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return -EPERM; |
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} |
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memset(bs, 0, sizeof(*bs)); |
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conf->intval = conf->beacon_interval; |
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/*
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* Setup dtim parameters according to |
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* last beacon we received (which may be none). |
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*/ |
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dtim_intval = conf->intval * conf->dtim_period; |
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/*
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* Pull nexttbtt forward to reflect the current |
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* TSF and calculate dtim state for the result. |
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*/ |
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tsf = ath9k_hw_gettsf64(ah); |
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conf->nexttbtt = ath9k_get_next_tbtt(ah, tsf, conf->intval); |
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bs->bs_intval = TU_TO_USEC(conf->intval); |
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bs->bs_dtimperiod = conf->dtim_period * bs->bs_intval; |
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bs->bs_nexttbtt = conf->nexttbtt; |
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bs->bs_nextdtim = conf->nexttbtt; |
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if (conf->dtim_period > 1) |
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bs->bs_nextdtim = ath9k_get_next_tbtt(ah, tsf, dtim_intval); |
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/*
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* Calculate the number of consecutive beacons to miss* before taking |
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* a BMISS interrupt. The configuration is specified in TU so we only |
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* need calculate based on the beacon interval. Note that we clamp the |
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* result to at most 15 beacons. |
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*/ |
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bs->bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, conf->intval); |
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if (bs->bs_bmissthreshold > 15) |
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bs->bs_bmissthreshold = 15; |
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else if (bs->bs_bmissthreshold <= 0) |
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bs->bs_bmissthreshold = 1; |
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/*
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* Calculate sleep duration. The configuration is given in ms. |
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* We ensure a multiple of the beacon period is used. Also, if the sleep |
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* duration is greater than the DTIM period then it makes senses |
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* to make it a multiple of that. |
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* |
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* XXX fixed at 100ms |
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*/ |
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bs->bs_sleepduration = TU_TO_USEC(roundup(IEEE80211_MS_TO_TU(100), |
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conf->intval)); |
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if (bs->bs_sleepduration > bs->bs_dtimperiod) |
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bs->bs_sleepduration = bs->bs_dtimperiod; |
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/* TSF out of range threshold fixed at 1 second */ |
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bs->bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; |
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ath_dbg(common, BEACON, "bmiss: %u sleep: %u\n", |
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bs->bs_bmissthreshold, bs->bs_sleepduration); |
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return 0; |
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} |
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EXPORT_SYMBOL(ath9k_cmn_beacon_config_sta); |
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@ -0,0 +1,21 @@ |
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/*
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* Copyright (c) 2009-2011 Atheros Communications Inc. |
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* |
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* Permission to use, copy, modify, and/or distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
||||
* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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struct ath_beacon_config; |
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int ath9k_cmn_beacon_config_sta(struct ath_hw *ah, |
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struct ath_beacon_config *conf, |
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struct ath9k_beacon_state *bs); |
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