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, htc_imask = 0;
  30         u64 tsf;
  31         int num_beacons, offset, dtim_dec_count, cfp_dec_count;
  32         int ret;
  33         u8 cmd_rsp;
  34
  35         memset(&bs, 0, sizeof(bs));
  36
  37         intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
  38         bmiss_timeout = (ATH_DEFAULT_BMISS_LIMIT * bss_conf->beacon_interval);
  39
  40         /*
  41          * Setup dtim and cfp parameters according to
  42          * last beacon we received (which may be none).
  43          */
  44         dtimperiod = bss_conf->dtim_period;
  45         if (dtimperiod <= 0)            /* NB: 0 if not known */
  46                 dtimperiod = 1;
  47         dtimcount = 1;
  48         if (dtimcount >= dtimperiod)    /* NB: sanity check */
  49                 dtimcount = 0;
  50         cfpperiod = 1;                  /* NB: no PCF support yet */
  51         cfpcount = 0;
  52
  53         sleepduration = intval;
  54         if (sleepduration <= 0)
  55                 sleepduration = intval;
  56
  57         /*
  58          * Pull nexttbtt forward to reflect the current
  59          * TSF and calculate dtim+cfp state for the result.
  60          */
  61         tsf = ath9k_hw_gettsf64(priv->ah);
  62         tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
  63
  64         num_beacons = tsftu / intval + 1;
  65         offset = tsftu % intval;
  66         nexttbtt = tsftu - offset;
  67         if (offset)
  68                 nexttbtt += intval;
  69
  70         /* DTIM Beacon every dtimperiod Beacon */
  71         dtim_dec_count = num_beacons % dtimperiod;
  72         /* CFP every cfpperiod DTIM Beacon */
  73         cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
  74         if (dtim_dec_count)
  75                 cfp_dec_count++;
  76
  77         dtimcount -= dtim_dec_count;
  78         if (dtimcount < 0)
  79                 dtimcount += dtimperiod;
  80
  81         cfpcount -= cfp_dec_count;
  82         if (cfpcount < 0)
  83                 cfpcount += cfpperiod;
  84
  85         bs.bs_intval = intval;
  86         bs.bs_nexttbtt = nexttbtt;
  87         bs.bs_dtimperiod = dtimperiod*intval;
  88         bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
  89         bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
  90         bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
  91         bs.bs_cfpmaxduration = 0;
  92
  93         /*
  94          * Calculate the number of consecutive beacons to miss* before taking
  95          * a BMISS interrupt. The configuration is specified in TU so we only
  96          * need calculate based on the beacon interval.  Note that we clamp the
  97          * result to at most 15 beacons.
  98          */
  99         if (sleepduration > intval) {
 100                 bs.bs_bmissthreshold = ATH_DEFAULT_BMISS_LIMIT / 2;
 101         } else {
 102                 bs.bs_bmissthreshold = DIV_ROUND_UP(bmiss_timeout, intval);
 103                 if (bs.bs_bmissthreshold > 15)
 104                         bs.bs_bmissthreshold = 15;
 105                 else if (bs.bs_bmissthreshold <= 0)
 106                         bs.bs_bmissthreshold = 1;
 107         }
 108
 109         /*
 110          * Calculate sleep duration. The configuration is given in ms.
 111          * We ensure a multiple of the beacon period is used. Also, if the sleep
 112          * duration is greater than the DTIM period then it makes senses
 113          * to make it a multiple of that.
 114          *
 115          * XXX fixed at 100ms
 116          */
 117
 118         bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
 119         if (bs.bs_sleepduration > bs.bs_dtimperiod)
 120                 bs.bs_sleepduration = bs.bs_dtimperiod;
 121
 122         /* TSF out of range threshold fixed at 1 second */
 123         bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
 124
 125         ath_print(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
 126         ath_print(common, ATH_DBG_BEACON,
 127                   "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
 128                   bs.bs_bmissthreshold, bs.bs_sleepduration,
 129                   bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
 130
 131         /* Set the computed STA beacon timers */
 132
 133         WMI_CMD(WMI_DISABLE_INTR_CMDID);
 134         ath9k_hw_set_sta_beacon_timers(priv->ah, &bs);
 135         imask |= ATH9K_INT_BMISS;
 136         htc_imask = cpu_to_be32(imask);
 137         WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
 138 }
 139
 140 static void ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv *priv,
 141                                           struct htc_beacon_config *bss_conf)
 142 {
 143         struct ath_common *common = ath9k_hw_common(priv->ah);
 144         enum ath9k_int imask = 0;
 145         u32 nexttbtt, intval, htc_imask = 0;
 146         int ret;
 147         u8 cmd_rsp;
 148
 149         intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
 150         nexttbtt = intval;
 151         intval |= ATH9K_BEACON_ENA;
 152         if (priv->op_flags & OP_ENABLE_BEACON)
 153                 imask |= ATH9K_INT_SWBA;
 154
 155         ath_print(common, ATH_DBG_BEACON,
 156                   "IBSS Beacon config, intval: %d, imask: 0x%x\n",
 157                   bss_conf->beacon_interval, imask);
 158
 159         WMI_CMD(WMI_DISABLE_INTR_CMDID);
 160         ath9k_hw_beaconinit(priv->ah, nexttbtt, intval);
 161         priv->bmiss_cnt = 0;
 162         htc_imask = cpu_to_be32(imask);
 163         WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
 164 }
 165
 166 void ath9k_htc_beacon_update(struct ath9k_htc_priv *priv,
 167                              struct ieee80211_vif *vif)
 168 {
 169         struct ath_common *common = ath9k_hw_common(priv->ah);
 170
 171         spin_lock_bh(&priv->beacon_lock);
 172
 173         if (priv->beacon)
 174                 dev_kfree_skb_any(priv->beacon);
 175
 176         priv->beacon = ieee80211_beacon_get(priv->hw, vif);
 177         if (!priv->beacon)
 178                 ath_print(common, ATH_DBG_BEACON,
 179                           "Unable to allocate beacon\n");
 180
 181         spin_unlock_bh(&priv->beacon_lock);
 182 }
 183
 184 void ath9k_htc_swba(struct ath9k_htc_priv *priv, u8 beacon_pending)
 185 {
 186         struct ath9k_htc_vif *avp = (void *)priv->vif->drv_priv;
 187         struct tx_beacon_header beacon_hdr;
 188         struct ath9k_htc_tx_ctl tx_ctl;
 189         struct ieee80211_tx_info *info;
 190         u8 *tx_fhdr;
 191
 192         memset(&beacon_hdr, 0, sizeof(struct tx_beacon_header));
 193         memset(&tx_ctl, 0, sizeof(struct ath9k_htc_tx_ctl));
 194
 195         /* FIXME: Handle BMISS */
 196         if (beacon_pending != 0) {
 197                 priv->bmiss_cnt++;
 198                 return;
 199         }
 200
 201         spin_lock_bh(&priv->beacon_lock);
 202
 203         if (unlikely(priv->op_flags & OP_SCANNING)) {
 204                 spin_unlock_bh(&priv->beacon_lock);
 205                 return;
 206         }
 207
 208         if (unlikely(priv->beacon == NULL)) {
 209                 spin_unlock_bh(&priv->beacon_lock);
 210                 return;
 211         }
 212
 213         /* Free the old SKB first */
 214         dev_kfree_skb_any(priv->beacon);
 215
 216         /* Get a new beacon */
 217         priv->beacon = ieee80211_beacon_get(priv->hw, priv->vif);
 218         if (!priv->beacon) {
 219                 spin_unlock_bh(&priv->beacon_lock);
 220                 return;
 221         }
 222
 223         info = IEEE80211_SKB_CB(priv->beacon);
 224         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
 225                 struct ieee80211_hdr *hdr =
 226                         (struct ieee80211_hdr *) priv->beacon->data;
 227                 priv->seq_no += 0x10;
 228                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
 229                 hdr->seq_ctrl |= cpu_to_le16(priv->seq_no);
 230         }
 231
 232         tx_ctl.type = ATH9K_HTC_NORMAL;
 233         beacon_hdr.vif_index = avp->index;
 234         tx_fhdr = skb_push(priv->beacon, sizeof(beacon_hdr));
 235         memcpy(tx_fhdr, (u8 *) &beacon_hdr, sizeof(beacon_hdr));
 236
 237         htc_send(priv->htc, priv->beacon, priv->beacon_ep, &tx_ctl);
 238
 239         spin_unlock_bh(&priv->beacon_lock);
 240 }
 241
 242
 243 void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,
 244                              struct ieee80211_vif *vif)
 245 {
 246         struct ath_common *common = ath9k_hw_common(priv->ah);
 247         enum nl80211_iftype iftype;
 248         struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
 249
 250         if (vif) {
 251                 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
 252                 iftype = vif->type;
 253                 cur_conf->beacon_interval = bss_conf->beacon_int;
 254                 cur_conf->dtim_period = bss_conf->dtim_period;
 255                 cur_conf->listen_interval = 1;
 256                 cur_conf->dtim_count = 1;
 257                 cur_conf->bmiss_timeout =
 258                         ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
 259         } else
 260                 iftype = priv->ah->opmode;
 261
 262         if (cur_conf->beacon_interval == 0)
 263                 cur_conf->beacon_interval = 100;
 264
 265         switch (iftype) {
 266         case NL80211_IFTYPE_STATION:
 267                 ath9k_htc_beacon_config_sta(priv, cur_conf);
 268                 break;
 269         case NL80211_IFTYPE_ADHOC:
 270                 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
 271                 break;
 272         default:
 273                 ath_print(common, ATH_DBG_CONFIG,
 274                           "Unsupported beaconing mode\n");
 275                 return;
 276         }
 277 }