drivers/net/wireless/ti/wlcore/ps.c

   1 /*
   2  * This file is part of wl1271
   3  *
   4  * Copyright (C) 2008-2009 Nokia Corporation
   5  *
   6  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include "ps.h"
  25 #include "io.h"
  26 #include "tx.h"
  27 #include "debug.h"
  28
  29 #define WL1271_WAKEUP_TIMEOUT 500
  30
  31 #define ELP_ENTRY_DELAY  30
  32
  33 void wl1271_elp_work(struct work_struct *work)
  34 {
  35         struct delayed_work *dwork;
  36         struct wl1271 *wl;
  37         struct wl12xx_vif *wlvif;
  38         int ret;
  39
  40         dwork = container_of(work, struct delayed_work, work);
  41         wl = container_of(dwork, struct wl1271, elp_work);
  42
  43         wl1271_debug(DEBUG_PSM, "elp work");
  44
  45         mutex_lock(&wl->mutex);
  46
  47         if (unlikely(wl->state != WLCORE_STATE_ON))
  48                 goto out;
  49
  50         /* our work might have been already cancelled */
  51         if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
  52                 goto out;
  53
  54         if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
  55                 goto out;
  56
  57         wl12xx_for_each_wlvif(wl, wlvif) {
  58                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
  59                         goto out;
  60
  61                 if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) &&
  62                     test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
  63                         goto out;
  64         }
  65
  66         wl1271_debug(DEBUG_PSM, "chip to elp");
  67         ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_SLEEP);
  68         if (ret < 0) {
  69                 wl12xx_queue_recovery_work(wl);
  70                 goto out;
  71         }
  72
  73         set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
  74
  75 out:
  76         mutex_unlock(&wl->mutex);
  77 }
  78
  79 /* Routines to toggle sleep mode while in ELP */
  80 void wl1271_ps_elp_sleep(struct wl1271 *wl)
  81 {
  82         struct wl12xx_vif *wlvif;
  83         u32 timeout;
  84
  85         if (wl->sleep_auth != WL1271_PSM_ELP)
  86                 return;
  87
  88         /* we shouldn't get consecutive sleep requests */
  89         if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
  90                 return;
  91
  92         wl12xx_for_each_wlvif(wl, wlvif) {
  93                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
  94                         return;
  95
  96                 if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) &&
  97                     test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
  98                         return;
  99         }
 100
 101         timeout = ELP_ENTRY_DELAY;
 102         ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
 103                                      msecs_to_jiffies(timeout));
 104 }
 105
 106 int wl1271_ps_elp_wakeup(struct wl1271 *wl)
 107 {
 108         DECLARE_COMPLETION_ONSTACK(compl);
 109         unsigned long flags;
 110         int ret;
 111         u32 start_time = jiffies;
 112         bool pending = false;
 113
 114         /*
 115          * we might try to wake up even if we didn't go to sleep
 116          * before (e.g. on boot)
 117          */
 118         if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))
 119                 return 0;
 120
 121         /* don't cancel_sync as it might contend for a mutex and deadlock */
 122         cancel_delayed_work(&wl->elp_work);
 123
 124         if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
 125                 return 0;
 126
 127         wl1271_debug(DEBUG_PSM, "waking up chip from elp");
 128
 129         /*
 130          * The spinlock is required here to synchronize both the work and
 131          * the completion variable in one entity.
 132          */
 133         spin_lock_irqsave(&wl->wl_lock, flags);
 134         if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
 135                 pending = true;
 136         else
 137                 wl->elp_compl = &compl;
 138         spin_unlock_irqrestore(&wl->wl_lock, flags);
 139
 140         ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_WAKE_UP);
 141         if (ret < 0) {
 142                 wl12xx_queue_recovery_work(wl);
 143                 goto err;
 144         }
 145
 146         if (!pending) {
 147                 ret = wait_for_completion_timeout(
 148                         &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
 149                 if (ret == 0) {
 150                         wl1271_error("ELP wakeup timeout!");
 151                         wl12xx_queue_recovery_work(wl);
 152                         ret = -ETIMEDOUT;
 153                         goto err;
 154                 }
 155         }
 156
 157         clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 158
 159         wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
 160                      jiffies_to_msecs(jiffies - start_time));
 161         goto out;
 162
 163 err:
 164         spin_lock_irqsave(&wl->wl_lock, flags);
 165         wl->elp_compl = NULL;
 166         spin_unlock_irqrestore(&wl->wl_lock, flags);
 167         return ret;
 168
 169 out:
 170         return 0;
 171 }
 172
 173 int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 174                        enum wl1271_cmd_ps_mode mode)
 175 {
 176         int ret;
 177         u16 timeout = wl->conf.conn.dynamic_ps_timeout;
 178
 179         switch (mode) {
 180         case STATION_AUTO_PS_MODE:
 181         case STATION_POWER_SAVE_MODE:
 182                 wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)",
 183                              mode, timeout);
 184
 185                 ret = wl1271_acx_wake_up_conditions(wl, wlvif,
 186                                             wl->conf.conn.wake_up_event,
 187                                             wl->conf.conn.listen_interval);
 188                 if (ret < 0) {
 189                         wl1271_error("couldn't set wake up conditions");
 190                         return ret;
 191                 }
 192
 193                 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout);
 194                 if (ret < 0)
 195                         return ret;
 196
 197                 set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
 198
 199                 /*
 200                  * enable beacon early termination.
 201                  * Not relevant for 5GHz and for high rates.
 202                  */
 203                 if ((wlvif->band == IEEE80211_BAND_2GHZ) &&
 204                     (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
 205                         ret = wl1271_acx_bet_enable(wl, wlvif, true);
 206                         if (ret < 0)
 207                                 return ret;
 208                 }
 209                 break;
 210         case STATION_ACTIVE_MODE:
 211                 wl1271_debug(DEBUG_PSM, "leaving psm");
 212
 213                 /* disable beacon early termination */
 214                 if ((wlvif->band == IEEE80211_BAND_2GHZ) &&
 215                     (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
 216                         ret = wl1271_acx_bet_enable(wl, wlvif, false);
 217                         if (ret < 0)
 218                                 return ret;
 219                 }
 220
 221                 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0);
 222                 if (ret < 0)
 223                         return ret;
 224
 225                 clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
 226                 break;
 227         default:
 228                 wl1271_warning("trying to set ps to unsupported mode %d", mode);
 229                 ret = -EINVAL;
 230         }
 231
 232         return ret;
 233 }
 234
 235 static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
 236 {
 237         int i;
 238         struct sk_buff *skb;
 239         struct ieee80211_tx_info *info;
 240         unsigned long flags;
 241         int filtered[NUM_TX_QUEUES];
 242         struct wl1271_link *lnk = &wl->links[hlid];
 243
 244         /* filter all frames currently in the low level queues for this hlid */
 245         for (i = 0; i < NUM_TX_QUEUES; i++) {
 246                 filtered[i] = 0;
 247                 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
 248                         filtered[i]++;
 249
 250                         if (WARN_ON(wl12xx_is_dummy_packet(wl, skb)))
 251                                 continue;
 252
 253                         info = IEEE80211_SKB_CB(skb);
 254                         info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 255                         info->status.rates[0].idx = -1;
 256                         ieee80211_tx_status_ni(wl->hw, skb);
 257                 }
 258         }
 259
 260         spin_lock_irqsave(&wl->wl_lock, flags);
 261         for (i = 0; i < NUM_TX_QUEUES; i++) {
 262                 wl->tx_queue_count[i] -= filtered[i];
 263                 if (lnk->wlvif)
 264                         lnk->wlvif->tx_queue_count[i] -= filtered[i];
 265         }
 266         spin_unlock_irqrestore(&wl->wl_lock, flags);
 267
 268         wl1271_handle_tx_low_watermark(wl);
 269 }
 270
 271 void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 272                           u8 hlid, bool clean_queues)
 273 {
 274         struct ieee80211_sta *sta;
 275         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 276
 277         if (test_bit(hlid, &wl->ap_ps_map))
 278                 return;
 279
 280         wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d "
 281                      "clean_queues %d", hlid, wl->links[hlid].allocated_pkts,
 282                      clean_queues);
 283
 284         rcu_read_lock();
 285         sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
 286         if (!sta) {
 287                 wl1271_error("could not find sta %pM for starting ps",
 288                              wl->links[hlid].addr);
 289                 rcu_read_unlock();
 290                 return;
 291         }
 292
 293         ieee80211_sta_ps_transition_ni(sta, true);
 294         rcu_read_unlock();
 295
 296         /* do we want to filter all frames from this link's queues? */
 297         if (clean_queues)
 298                 wl1271_ps_filter_frames(wl, hlid);
 299
 300         __set_bit(hlid, &wl->ap_ps_map);
 301 }
 302
 303 void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid)
 304 {
 305         struct ieee80211_sta *sta;
 306         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 307
 308         if (!test_bit(hlid, &wl->ap_ps_map))
 309                 return;
 310
 311         wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
 312
 313         __clear_bit(hlid, &wl->ap_ps_map);
 314
 315         rcu_read_lock();
 316         sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
 317         if (!sta) {
 318                 wl1271_error("could not find sta %pM for ending ps",
 319                              wl->links[hlid].addr);
 320                 goto end;
 321         }
 322
 323         ieee80211_sta_ps_transition_ni(sta, false);
 324 end:
 325         rcu_read_unlock();
 326 }