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 #define ELP_ENTRY_DELAY_FORCE_PS  5
  33
  34 void wl1271_elp_work(struct work_struct *work)
  35 {
  36         struct delayed_work *dwork;
  37         struct wl1271 *wl;
  38         struct wl12xx_vif *wlvif;
  39         int ret;
  40
  41         dwork = container_of(work, struct delayed_work, work);
  42         wl = container_of(dwork, struct wl1271, elp_work);
  43
  44         wl1271_debug(DEBUG_PSM, "elp work");
  45
  46         mutex_lock(&wl->mutex);
  47
  48         if (unlikely(wl->state != WLCORE_STATE_ON))
  49                 goto out;
  50
  51         /* our work might have been already cancelled */
  52         if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
  53                 goto out;
  54
  55         if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
  56                 goto out;
  57
  58         wl12xx_for_each_wlvif(wl, wlvif) {
  59                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
  60                         goto out;
  61
  62                 if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) &&
  63                     test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
  64                         goto out;
  65         }
  66
  67         wl1271_debug(DEBUG_PSM, "chip to elp");
  68         ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_SLEEP);
  69         if (ret < 0) {
  70                 wl12xx_queue_recovery_work(wl);
  71                 goto out;
  72         }
  73
  74         set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
  75
  76 out:
  77         mutex_unlock(&wl->mutex);
  78 }
  79
  80 /* Routines to toggle sleep mode while in ELP */
  81 void wl1271_ps_elp_sleep(struct wl1271 *wl)
  82 {
  83         struct wl12xx_vif *wlvif;
  84         u32 timeout;
  85
  86         if (wl->sleep_auth != WL1271_PSM_ELP)
  87                 return;
  88
  89         /* we shouldn't get consecutive sleep requests */
  90         if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
  91                 return;
  92
  93         wl12xx_for_each_wlvif(wl, wlvif) {
  94                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
  95                         return;
  96
  97                 if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) &&
  98                     test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
  99                         return;
 100         }
 101
 102         timeout = wl->conf.conn.forced_ps ?
 103                         ELP_ENTRY_DELAY_FORCE_PS : ELP_ENTRY_DELAY;
 104         ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
 105                                      msecs_to_jiffies(timeout));
 106 }
 107
 108 int wl1271_ps_elp_wakeup(struct wl1271 *wl)
 109 {
 110         DECLARE_COMPLETION_ONSTACK(compl);
 111         unsigned long flags;
 112         int ret;
 113         unsigned long start_time = jiffies;
 114         bool pending = false;
 115
 116         /*
 117          * we might try to wake up even if we didn't go to sleep
 118          * before (e.g. on boot)
 119          */
 120         if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))
 121                 return 0;
 122
 123         /* don't cancel_sync as it might contend for a mutex and deadlock */
 124         cancel_delayed_work(&wl->elp_work);
 125
 126         if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
 127                 return 0;
 128
 129         wl1271_debug(DEBUG_PSM, "waking up chip from elp");
 130
 131         /*
 132          * The spinlock is required here to synchronize both the work and
 133          * the completion variable in one entity.
 134          */
 135         spin_lock_irqsave(&wl->wl_lock, flags);
 136         if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
 137                 pending = true;
 138         else
 139                 wl->elp_compl = &compl;
 140         spin_unlock_irqrestore(&wl->wl_lock, flags);
 141
 142         ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_WAKE_UP);
 143         if (ret < 0) {
 144                 wl12xx_queue_recovery_work(wl);
 145                 goto err;
 146         }
 147
 148         if (!pending) {
 149                 ret = wait_for_completion_timeout(
 150                         &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
 151                 if (ret == 0) {
 152                         wl1271_error("ELP wakeup timeout!");
 153                         wl12xx_queue_recovery_work(wl);
 154                         ret = -ETIMEDOUT;
 155                         goto err;
 156                 }
 157         }
 158
 159         clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 160
 161         wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
 162                      jiffies_to_msecs(jiffies - start_time));
 163         goto out;
 164
 165 err:
 166         spin_lock_irqsave(&wl->wl_lock, flags);
 167         wl->elp_compl = NULL;
 168         spin_unlock_irqrestore(&wl->wl_lock, flags);
 169         return ret;
 170
 171 out:
 172         return 0;
 173 }
 174
 175 int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 176                        enum wl1271_cmd_ps_mode mode)
 177 {
 178         int ret;
 179         u16 timeout = wl->conf.conn.dynamic_ps_timeout;
 180
 181         switch (mode) {
 182         case STATION_AUTO_PS_MODE:
 183         case STATION_POWER_SAVE_MODE:
 184                 wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)",
 185                              mode, timeout);
 186
 187                 ret = wl1271_acx_wake_up_conditions(wl, wlvif,
 188                                             wl->conf.conn.wake_up_event,
 189                                             wl->conf.conn.listen_interval);
 190                 if (ret < 0) {
 191                         wl1271_error("couldn't set wake up conditions");
 192                         return ret;
 193                 }
 194
 195                 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout);
 196                 if (ret < 0)
 197                         return ret;
 198
 199                 set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
 200
 201                 /*
 202                  * enable beacon early termination.
 203                  * Not relevant for 5GHz and for high rates.
 204                  */
 205                 if ((wlvif->band == IEEE80211_BAND_2GHZ) &&
 206                     (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
 207                         ret = wl1271_acx_bet_enable(wl, wlvif, true);
 208                         if (ret < 0)
 209                                 return ret;
 210                 }
 211                 break;
 212         case STATION_ACTIVE_MODE:
 213                 wl1271_debug(DEBUG_PSM, "leaving psm");
 214
 215                 /* disable beacon early termination */
 216                 if ((wlvif->band == IEEE80211_BAND_2GHZ) &&
 217                     (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
 218                         ret = wl1271_acx_bet_enable(wl, wlvif, false);
 219                         if (ret < 0)
 220                                 return ret;
 221                 }
 222
 223                 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0);
 224                 if (ret < 0)
 225                         return ret;
 226
 227                 clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
 228                 break;
 229         default:
 230                 wl1271_warning("trying to set ps to unsupported mode %d", mode);
 231                 ret = -EINVAL;
 232         }
 233
 234         return ret;
 235 }
 236
 237 static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
 238 {
 239         int i;
 240         struct sk_buff *skb;
 241         struct ieee80211_tx_info *info;
 242         unsigned long flags;
 243         int filtered[NUM_TX_QUEUES];
 244         struct wl1271_link *lnk = &wl->links[hlid];
 245
 246         /* filter all frames currently in the low level queues for this hlid */
 247         for (i = 0; i < NUM_TX_QUEUES; i++) {
 248                 filtered[i] = 0;
 249                 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
 250                         filtered[i]++;
 251
 252                         if (WARN_ON(wl12xx_is_dummy_packet(wl, skb)))
 253                                 continue;
 254
 255                         info = IEEE80211_SKB_CB(skb);
 256                         info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 257                         info->status.rates[0].idx = -1;
 258                         ieee80211_tx_status_ni(wl->hw, skb);
 259                 }
 260         }
 261
 262         spin_lock_irqsave(&wl->wl_lock, flags);
 263         for (i = 0; i < NUM_TX_QUEUES; i++) {
 264                 wl->tx_queue_count[i] -= filtered[i];
 265                 if (lnk->wlvif)
 266                         lnk->wlvif->tx_queue_count[i] -= filtered[i];
 267         }
 268         spin_unlock_irqrestore(&wl->wl_lock, flags);
 269
 270         wl1271_handle_tx_low_watermark(wl);
 271 }
 272
 273 void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 274                           u8 hlid, bool clean_queues)
 275 {
 276         struct ieee80211_sta *sta;
 277         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 278
 279         if (test_bit(hlid, &wl->ap_ps_map))
 280                 return;
 281
 282         wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d "
 283                      "clean_queues %d", hlid, wl->links[hlid].allocated_pkts,
 284                      clean_queues);
 285
 286         rcu_read_lock();
 287         sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
 288         if (!sta) {
 289                 wl1271_error("could not find sta %pM for starting ps",
 290                              wl->links[hlid].addr);
 291                 rcu_read_unlock();
 292                 return;
 293         }
 294
 295         ieee80211_sta_ps_transition_ni(sta, true);
 296         rcu_read_unlock();
 297
 298         /* do we want to filter all frames from this link's queues? */
 299         if (clean_queues)
 300                 wl1271_ps_filter_frames(wl, hlid);
 301
 302         __set_bit(hlid, &wl->ap_ps_map);
 303 }
 304
 305 void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid)
 306 {
 307         struct ieee80211_sta *sta;
 308         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 309
 310         if (!test_bit(hlid, &wl->ap_ps_map))
 311                 return;
 312
 313         wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
 314
 315         __clear_bit(hlid, &wl->ap_ps_map);
 316
 317         rcu_read_lock();
 318         sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
 319         if (!sta) {
 320                 wl1271_error("could not find sta %pM for ending ps",
 321                              wl->links[hlid].addr);
 322                 goto end;
 323         }
 324
 325         ieee80211_sta_ps_transition_ni(sta, false);
 326 end:
 327         rcu_read_unlock();
 328 }