286 lines
8.2 KiB
C
286 lines
8.2 KiB
C
/*
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* Copyright (c) 2010 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 "htc.h"
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#define FUDGE 2
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static void ath9k_htc_beacon_config_sta(struct ath9k_htc_priv *priv,
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struct htc_beacon_config *bss_conf)
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{
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struct ath_common *common = ath9k_hw_common(priv->ah);
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struct ath9k_beacon_state bs;
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enum ath9k_int imask = 0;
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int dtimperiod, dtimcount, sleepduration;
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int cfpperiod, cfpcount, bmiss_timeout;
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u32 nexttbtt = 0, intval, tsftu;
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__be32 htc_imask = 0;
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u64 tsf;
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int num_beacons, offset, dtim_dec_count, cfp_dec_count;
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int ret;
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u8 cmd_rsp;
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memset(&bs, 0, sizeof(bs));
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intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
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bmiss_timeout = (ATH_DEFAULT_BMISS_LIMIT * bss_conf->beacon_interval);
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/*
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* Setup dtim and cfp parameters according to
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* last beacon we received (which may be none).
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*/
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dtimperiod = bss_conf->dtim_period;
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if (dtimperiod <= 0) /* NB: 0 if not known */
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dtimperiod = 1;
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dtimcount = 1;
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if (dtimcount >= dtimperiod) /* NB: sanity check */
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dtimcount = 0;
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cfpperiod = 1; /* NB: no PCF support yet */
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cfpcount = 0;
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sleepduration = intval;
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if (sleepduration <= 0)
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sleepduration = intval;
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/*
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* Pull nexttbtt forward to reflect the current
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* TSF and calculate dtim+cfp state for the result.
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*/
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tsf = ath9k_hw_gettsf64(priv->ah);
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tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
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num_beacons = tsftu / intval + 1;
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offset = tsftu % intval;
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nexttbtt = tsftu - offset;
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if (offset)
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nexttbtt += intval;
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/* DTIM Beacon every dtimperiod Beacon */
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dtim_dec_count = num_beacons % dtimperiod;
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/* CFP every cfpperiod DTIM Beacon */
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cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
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if (dtim_dec_count)
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cfp_dec_count++;
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dtimcount -= dtim_dec_count;
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if (dtimcount < 0)
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dtimcount += dtimperiod;
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cfpcount -= cfp_dec_count;
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if (cfpcount < 0)
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cfpcount += cfpperiod;
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bs.bs_intval = intval;
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bs.bs_nexttbtt = nexttbtt;
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bs.bs_dtimperiod = dtimperiod*intval;
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bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
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bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
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bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
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bs.bs_cfpmaxduration = 0;
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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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if (sleepduration > intval) {
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bs.bs_bmissthreshold = ATH_DEFAULT_BMISS_LIMIT / 2;
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} else {
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bs.bs_bmissthreshold = DIV_ROUND_UP(bmiss_timeout, 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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/*
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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 = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
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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, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
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ath_dbg(common, ATH_DBG_BEACON,
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"bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
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bs.bs_bmissthreshold, bs.bs_sleepduration,
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bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
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/* Set the computed STA beacon timers */
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WMI_CMD(WMI_DISABLE_INTR_CMDID);
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ath9k_hw_set_sta_beacon_timers(priv->ah, &bs);
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imask |= ATH9K_INT_BMISS;
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htc_imask = cpu_to_be32(imask);
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WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
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}
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static void ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv *priv,
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struct htc_beacon_config *bss_conf)
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{
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struct ath_common *common = ath9k_hw_common(priv->ah);
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enum ath9k_int imask = 0;
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u32 nexttbtt, intval;
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__be32 htc_imask = 0;
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int ret;
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u8 cmd_rsp;
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intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
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nexttbtt = intval;
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intval |= ATH9K_BEACON_ENA;
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if (priv->op_flags & OP_ENABLE_BEACON)
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imask |= ATH9K_INT_SWBA;
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ath_dbg(common, ATH_DBG_BEACON,
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"IBSS Beacon config, intval: %d, imask: 0x%x\n",
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bss_conf->beacon_interval, imask);
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WMI_CMD(WMI_DISABLE_INTR_CMDID);
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ath9k_hw_beaconinit(priv->ah, nexttbtt, intval);
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priv->bmiss_cnt = 0;
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htc_imask = cpu_to_be32(imask);
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WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
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}
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void ath9k_htc_beaconep(void *drv_priv, struct sk_buff *skb,
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enum htc_endpoint_id ep_id, bool txok)
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{
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dev_kfree_skb_any(skb);
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}
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void ath9k_htc_swba(struct ath9k_htc_priv *priv, u8 beacon_pending)
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{
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struct ath9k_htc_vif *avp = (void *)priv->vif->drv_priv;
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struct tx_beacon_header beacon_hdr;
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struct ath9k_htc_tx_ctl tx_ctl;
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struct ieee80211_tx_info *info;
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struct sk_buff *beacon;
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u8 *tx_fhdr;
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memset(&beacon_hdr, 0, sizeof(struct tx_beacon_header));
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memset(&tx_ctl, 0, sizeof(struct ath9k_htc_tx_ctl));
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/* FIXME: Handle BMISS */
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if (beacon_pending != 0) {
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priv->bmiss_cnt++;
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return;
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}
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spin_lock_bh(&priv->beacon_lock);
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if (unlikely(priv->op_flags & OP_SCANNING)) {
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spin_unlock_bh(&priv->beacon_lock);
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return;
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}
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/* Get a new beacon */
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beacon = ieee80211_beacon_get(priv->hw, priv->vif);
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if (!beacon) {
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spin_unlock_bh(&priv->beacon_lock);
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return;
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}
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info = IEEE80211_SKB_CB(beacon);
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if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
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struct ieee80211_hdr *hdr =
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(struct ieee80211_hdr *) beacon->data;
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priv->seq_no += 0x10;
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hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
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hdr->seq_ctrl |= cpu_to_le16(priv->seq_no);
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}
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tx_ctl.type = ATH9K_HTC_NORMAL;
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beacon_hdr.vif_index = avp->index;
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tx_fhdr = skb_push(beacon, sizeof(beacon_hdr));
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memcpy(tx_fhdr, (u8 *) &beacon_hdr, sizeof(beacon_hdr));
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htc_send(priv->htc, beacon, priv->beacon_ep, &tx_ctl);
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spin_unlock_bh(&priv->beacon_lock);
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}
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/* Currently, only for IBSS */
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void ath9k_htc_beaconq_config(struct ath9k_htc_priv *priv)
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{
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struct ath_hw *ah = priv->ah;
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struct ath9k_tx_queue_info qi, qi_be;
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int qnum = priv->hwq_map[WME_AC_BE];
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memset(&qi, 0, sizeof(struct ath9k_tx_queue_info));
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memset(&qi_be, 0, sizeof(struct ath9k_tx_queue_info));
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ath9k_hw_get_txq_props(ah, qnum, &qi_be);
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qi.tqi_aifs = qi_be.tqi_aifs;
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/* For WIFI Beacon Distribution
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* Long slot time : 2x cwmin
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* Short slot time : 4x cwmin
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*/
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if (ah->slottime == ATH9K_SLOT_TIME_20)
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qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
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else
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qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
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qi.tqi_cwmax = qi_be.tqi_cwmax;
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if (!ath9k_hw_set_txq_props(ah, priv->beaconq, &qi)) {
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ath_err(ath9k_hw_common(ah),
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"Unable to update beacon queue %u!\n", qnum);
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} else {
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ath9k_hw_resettxqueue(ah, priv->beaconq);
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}
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}
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void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,
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struct ieee80211_vif *vif)
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{
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struct ath_common *common = ath9k_hw_common(priv->ah);
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struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
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struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
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cur_conf->beacon_interval = bss_conf->beacon_int;
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if (cur_conf->beacon_interval == 0)
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cur_conf->beacon_interval = 100;
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cur_conf->dtim_period = bss_conf->dtim_period;
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cur_conf->listen_interval = 1;
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cur_conf->dtim_count = 1;
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cur_conf->bmiss_timeout =
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ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
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switch (vif->type) {
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case NL80211_IFTYPE_STATION:
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ath9k_htc_beacon_config_sta(priv, cur_conf);
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break;
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case NL80211_IFTYPE_ADHOC:
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ath9k_htc_beacon_config_adhoc(priv, cur_conf);
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break;
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default:
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ath_dbg(common, ATH_DBG_CONFIG,
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"Unsupported beaconing mode\n");
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return;
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}
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}
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