drivers/net/wireless/ath/ath9k/htc_drv_beacon.c

   1 /*
   2  * Copyright (c) 2010 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "htc.h"
  18
  19 #define FUDGE 2
  20
  21 static void ath9k_htc_beacon_config_sta(struct ath9k_htc_priv *priv,
  22                                         struct htc_beacon_config *bss_conf)
  23 {
  24         struct ath_common *common = ath9k_hw_common(priv->ah);
  25         struct ath9k_beacon_state bs;
  26         enum ath9k_int imask = 0;
  27         int dtimperiod, dtimcount, sleepduration;
  28         int cfpperiod, cfpcount, bmiss_timeout;
  29         u32 nexttbtt = 0, intval, tsftu;
  30         __be32 htc_imask = 0;
  31         u64 tsf;
  32         int num_beacons, offset, dtim_dec_count, cfp_dec_count;
  33         int ret;
  34         u8 cmd_rsp;
  35
  36         memset(&bs, 0, sizeof(bs));
  37
  38         intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
  39         bmiss_timeout = (ATH_DEFAULT_BMISS_LIMIT * bss_conf->beacon_interval);
  40
  41         /*
  42          * Setup dtim and cfp parameters according to
  43          * last beacon we received (which may be none).
  44          */
  45         dtimperiod = bss_conf->dtim_period;
  46         if (dtimperiod <= 0)            /* NB: 0 if not known */
  47                 dtimperiod = 1;
  48         dtimcount = 1;
  49         if (dtimcount >= dtimperiod)    /* NB: sanity check */
  50                 dtimcount = 0;
  51         cfpperiod = 1;                  /* NB: no PCF support yet */
  52         cfpcount = 0;
  53
  54         sleepduration = intval;
  55         if (sleepduration <= 0)
  56                 sleepduration = intval;
  57
  58         /*
  59          * Pull nexttbtt forward to reflect the current
  60          * TSF and calculate dtim+cfp state for the result.
  61          */
  62         tsf = ath9k_hw_gettsf64(priv->ah);
  63         tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
  64
  65         num_beacons = tsftu / intval + 1;
  66         offset = tsftu % intval;
  67         nexttbtt = tsftu - offset;
  68         if (offset)
  69                 nexttbtt += intval;
  70
  71         /* DTIM Beacon every dtimperiod Beacon */
  72         dtim_dec_count = num_beacons % dtimperiod;
  73         /* CFP every cfpperiod DTIM Beacon */
  74         cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
  75         if (dtim_dec_count)
  76                 cfp_dec_count++;
  77
  78         dtimcount -= dtim_dec_count;
  79         if (dtimcount < 0)
  80                 dtimcount += dtimperiod;
  81
  82         cfpcount -= cfp_dec_count;
  83         if (cfpcount < 0)
  84                 cfpcount += cfpperiod;
  85
  86         bs.bs_intval = intval;
  87         bs.bs_nexttbtt = nexttbtt;
  88         bs.bs_dtimperiod = dtimperiod*intval;
  89         bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
  90         bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
  91         bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
  92         bs.bs_cfpmaxduration = 0;
  93
  94         /*
  95          * Calculate the number of consecutive beacons to miss* before taking
  96          * a BMISS interrupt. The configuration is specified in TU so we only
  97          * need calculate based on the beacon interval.  Note that we clamp the
  98          * result to at most 15 beacons.
  99          */
 100         if (sleepduration > intval) {
 101                 bs.bs_bmissthreshold = ATH_DEFAULT_BMISS_LIMIT / 2;
 102         } else {
 103                 bs.bs_bmissthreshold = DIV_ROUND_UP(bmiss_timeout, intval);
 104                 if (bs.bs_bmissthreshold > 15)
 105                         bs.bs_bmissthreshold = 15;
 106                 else if (bs.bs_bmissthreshold <= 0)
 107                         bs.bs_bmissthreshold = 1;
 108         }
 109
 110         /*
 111          * Calculate sleep duration. The configuration is given in ms.
 112          * We ensure a multiple of the beacon period is used. Also, if the sleep
 113          * duration is greater than the DTIM period then it makes senses
 114          * to make it a multiple of that.
 115          *
 116          * XXX fixed at 100ms
 117          */
 118
 119         bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
 120         if (bs.bs_sleepduration > bs.bs_dtimperiod)
 121                 bs.bs_sleepduration = bs.bs_dtimperiod;
 122
 123         /* TSF out of range threshold fixed at 1 second */
 124         bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
 125
 126         ath_print(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
 127         ath_print(common, ATH_DBG_BEACON,
 128                   "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
 129                   bs.bs_bmissthreshold, bs.bs_sleepduration,
 130                   bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
 131
 132         /* Set the computed STA beacon timers */
 133
 134         WMI_CMD(WMI_DISABLE_INTR_CMDID);
 135         ath9k_hw_set_sta_beacon_timers(priv->ah, &bs);
 136         imask |= ATH9K_INT_BMISS;
 137         htc_imask = cpu_to_be32(imask);
 138         WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
 139 }
 140
 141 static void ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv *priv,
 142                                           struct htc_beacon_config *bss_conf)
 143 {
 144         struct ath_common *common = ath9k_hw_common(priv->ah);
 145         enum ath9k_int imask = 0;
 146         u32 nexttbtt, intval;
 147         __be32 htc_imask = 0;
 148         int ret;
 149         u8 cmd_rsp;
 150
 151         intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
 152         nexttbtt = intval;
 153         intval |= ATH9K_BEACON_ENA;
 154         if (priv->op_flags & OP_ENABLE_BEACON)
 155                 imask |= ATH9K_INT_SWBA;
 156
 157         ath_print(common, ATH_DBG_BEACON,
 158                   "IBSS Beacon config, intval: %d, imask: 0x%x\n",
 159                   bss_conf->beacon_interval, imask);
 160
 161         WMI_CMD(WMI_DISABLE_INTR_CMDID);
 162         ath9k_hw_beaconinit(priv->ah, nexttbtt, intval);
 163         priv->bmiss_cnt = 0;
 164         htc_imask = cpu_to_be32(imask);
 165         WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
 166 }
 167
 168 void ath9k_htc_beacon_update(struct ath9k_htc_priv *priv,
 169                              struct ieee80211_vif *vif)
 170 {
 171         struct ath_common *common = ath9k_hw_common(priv->ah);
 172
 173         spin_lock_bh(&priv->beacon_lock);
 174
 175         if (priv->beacon)
 176                 dev_kfree_skb_any(priv->beacon);
 177
 178         priv->beacon = ieee80211_beacon_get(priv->hw, vif);
 179         if (!priv->beacon)
 180                 ath_print(common, ATH_DBG_BEACON,
 181                           "Unable to allocate beacon\n");
 182
 183         spin_unlock_bh(&priv->beacon_lock);
 184 }
 185
 186 void ath9k_htc_swba(struct ath9k_htc_priv *priv, u8 beacon_pending)
 187 {
 188         struct ath9k_htc_vif *avp = (void *)priv->vif->drv_priv;
 189         struct tx_beacon_header beacon_hdr;
 190         struct ath9k_htc_tx_ctl tx_ctl;
 191         struct ieee80211_tx_info *info;
 192         u8 *tx_fhdr;
 193
 194         memset(&beacon_hdr, 0, sizeof(struct tx_beacon_header));
 195         memset(&tx_ctl, 0, sizeof(struct ath9k_htc_tx_ctl));
 196
 197         /* FIXME: Handle BMISS */
 198         if (beacon_pending != 0) {
 199                 priv->bmiss_cnt++;
 200                 return;
 201         }
 202
 203         spin_lock_bh(&priv->beacon_lock);
 204
 205         if (unlikely(priv->op_flags & OP_SCANNING)) {
 206                 spin_unlock_bh(&priv->beacon_lock);
 207                 return;
 208         }
 209
 210         if (unlikely(priv->beacon == NULL)) {
 211                 spin_unlock_bh(&priv->beacon_lock);
 212                 return;
 213         }
 214
 215         /* Free the old SKB first */
 216         dev_kfree_skb_any(priv->beacon);
 217
 218         /* Get a new beacon */
 219         priv->beacon = ieee80211_beacon_get(priv->hw, priv->vif);
 220         if (!priv->beacon) {
 221                 spin_unlock_bh(&priv->beacon_lock);
 222                 return;
 223         }
 224
 225         info = IEEE80211_SKB_CB(priv->beacon);
 226         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
 227                 struct ieee80211_hdr *hdr =
 228                         (struct ieee80211_hdr *) priv->beacon->data;
 229                 priv->seq_no += 0x10;
 230                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
 231                 hdr->seq_ctrl |= cpu_to_le16(priv->seq_no);
 232         }
 233
 234         tx_ctl.type = ATH9K_HTC_NORMAL;
 235         beacon_hdr.vif_index = avp->index;
 236         tx_fhdr = skb_push(priv->beacon, sizeof(beacon_hdr));
 237         memcpy(tx_fhdr, (u8 *) &beacon_hdr, sizeof(beacon_hdr));
 238
 239         htc_send(priv->htc, priv->beacon, priv->beacon_ep, &tx_ctl);
 240
 241         spin_unlock_bh(&priv->beacon_lock);
 242 }
 243
 244
 245 void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,
 246                              struct ieee80211_vif *vif)
 247 {
 248         struct ath_common *common = ath9k_hw_common(priv->ah);
 249         struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
 250         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
 251
 252         cur_conf->beacon_interval = bss_conf->beacon_int;
 253         if (cur_conf->beacon_interval == 0)
 254                 cur_conf->beacon_interval = 100;
 255
 256         cur_conf->dtim_period = bss_conf->dtim_period;
 257         cur_conf->listen_interval = 1;
 258         cur_conf->dtim_count = 1;
 259         cur_conf->bmiss_timeout =
 260                 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
 261
 262         switch (vif->type) {
 263         case NL80211_IFTYPE_STATION:
 264                 ath9k_htc_beacon_config_sta(priv, cur_conf);
 265                 break;
 266         case NL80211_IFTYPE_ADHOC:
 267                 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
 268                 break;
 269         default:
 270                 ath_print(common, ATH_DBG_CONFIG,
 271                           "Unsupported beaconing mode\n");
 272                 return;
 273         }
 274 }