drivers/net/wireless/wl12xx/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 "reg.h"
  25 #include "ps.h"
  26 #include "io.h"
  27 #include "tx.h"
  28 #include "debug.h"
  29
  30 #define WL1271_WAKEUP_TIMEOUT 500
  31
  32 void wl1271_elp_work(struct work_struct *work)
  33 {
  34         struct delayed_work *dwork;
  35         struct wl1271 *wl;
  36         struct wl12xx_vif *wlvif;
  37
  38         dwork = container_of(work, struct delayed_work, work);
  39         wl = container_of(dwork, struct wl1271, elp_work);
  40
  41         wl1271_debug(DEBUG_PSM, "elp work");
  42
  43         mutex_lock(&wl->mutex);
  44
  45         if (unlikely(wl->state == WL1271_STATE_OFF))
  46                 goto out;
  47
  48         /* our work might have been already cancelled */
  49         if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
  50                 goto out;
  51
  52         if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
  53                 goto out;
  54
  55         wl12xx_for_each_wlvif(wl, wlvif) {
  56                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
  57                         goto out;
  58
  59                 if (!test_bit(WLVIF_FLAG_PSM, &wlvif->flags) &&
  60                     test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
  61                         goto out;
  62         }
  63
  64         wl1271_debug(DEBUG_PSM, "chip to elp");
  65         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
  66         set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
  67
  68 out:
  69         mutex_unlock(&wl->mutex);
  70 }
  71
  72 #define ELP_ENTRY_DELAY  5
  73
  74 /* Routines to toggle sleep mode while in ELP */
  75 void wl1271_ps_elp_sleep(struct wl1271 *wl)
  76 {
  77         struct wl12xx_vif *wlvif;
  78
  79         /* we shouldn't get consecutive sleep requests */
  80         if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
  81                 return;
  82
  83         wl12xx_for_each_wlvif(wl, wlvif) {
  84                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
  85                         return;
  86
  87                 if (!test_bit(WLVIF_FLAG_PSM, &wlvif->flags) &&
  88                     test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
  89                         return;
  90         }
  91
  92         ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
  93                                      msecs_to_jiffies(ELP_ENTRY_DELAY));
  94 }
  95
  96 int wl1271_ps_elp_wakeup(struct wl1271 *wl)
  97 {
  98         DECLARE_COMPLETION_ONSTACK(compl);
  99         unsigned long flags;
 100         int ret;
 101         u32 start_time = jiffies;
 102         bool pending = false;
 103
 104         /*
 105          * we might try to wake up even if we didn't go to sleep
 106          * before (e.g. on boot)
 107          */
 108         if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))
 109                 return 0;
 110
 111         /* don't cancel_sync as it might contend for a mutex and deadlock */
 112         cancel_delayed_work(&wl->elp_work);
 113
 114         if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
 115                 return 0;
 116
 117         wl1271_debug(DEBUG_PSM, "waking up chip from elp");
 118
 119         /*
 120          * The spinlock is required here to synchronize both the work and
 121          * the completion variable in one entity.
 122          */
 123         spin_lock_irqsave(&wl->wl_lock, flags);
 124         if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
 125                 pending = true;
 126         else
 127                 wl->elp_compl = &compl;
 128         spin_unlock_irqrestore(&wl->wl_lock, flags);
 129
 130         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
 131
 132         if (!pending) {
 133                 ret = wait_for_completion_timeout(
 134                         &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
 135                 if (ret == 0) {
 136                         wl1271_error("ELP wakeup timeout!");
 137                         wl12xx_queue_recovery_work(wl);
 138                         ret = -ETIMEDOUT;
 139                         goto err;
 140                 } else if (ret < 0) {
 141                         wl1271_error("ELP wakeup completion error.");
 142                         goto err;
 143                 }
 144         }
 145
 146         clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 147
 148         wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
 149                      jiffies_to_msecs(jiffies - start_time));
 150         goto out;
 151
 152 err:
 153         spin_lock_irqsave(&wl->wl_lock, flags);
 154         wl->elp_compl = NULL;
 155         spin_unlock_irqrestore(&wl->wl_lock, flags);
 156         return ret;
 157
 158 out:
 159         return 0;
 160 }
 161
 162 int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 163                        enum wl1271_cmd_ps_mode mode, u32 rates, bool send)
 164 {
 165         int ret;
 166
 167         switch (mode) {
 168         case STATION_POWER_SAVE_MODE:
 169                 wl1271_debug(DEBUG_PSM, "entering psm");
 170
 171                 ret = wl1271_acx_wake_up_conditions(wl, wlvif);
 172                 if (ret < 0) {
 173                         wl1271_error("couldn't set wake up conditions");
 174                         return ret;
 175                 }
 176
 177                 ret = wl1271_cmd_ps_mode(wl, wlvif, STATION_POWER_SAVE_MODE);
 178                 if (ret < 0)
 179                         return ret;
 180
 181                 set_bit(WLVIF_FLAG_PSM, &wlvif->flags);
 182                 break;
 183         case STATION_ACTIVE_MODE:
 184         default:
 185                 wl1271_debug(DEBUG_PSM, "leaving psm");
 186
 187                 /* disable beacon early termination */
 188                 if (wlvif->band == IEEE80211_BAND_2GHZ) {
 189                         ret = wl1271_acx_bet_enable(wl, wlvif, false);
 190                         if (ret < 0)
 191                                 return ret;
 192                 }
 193
 194                 ret = wl1271_cmd_ps_mode(wl, wlvif, STATION_ACTIVE_MODE);
 195                 if (ret < 0)
 196                         return ret;
 197
 198                 clear_bit(WLVIF_FLAG_PSM, &wlvif->flags);
 199                 break;
 200         }
 201
 202         return ret;
 203 }
 204
 205 static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
 206 {
 207         int i;
 208         struct sk_buff *skb;
 209         struct ieee80211_tx_info *info;
 210         unsigned long flags;
 211         int filtered[NUM_TX_QUEUES];
 212
 213         /* filter all frames currently in the low level queues for this hlid */
 214         for (i = 0; i < NUM_TX_QUEUES; i++) {
 215                 filtered[i] = 0;
 216                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 217                         filtered[i]++;
 218
 219                         if (WARN_ON(wl12xx_is_dummy_packet(wl, skb)))
 220                                 continue;
 221
 222                         info = IEEE80211_SKB_CB(skb);
 223                         info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 224                         info->status.rates[0].idx = -1;
 225                         ieee80211_tx_status_ni(wl->hw, skb);
 226                 }
 227         }
 228
 229         spin_lock_irqsave(&wl->wl_lock, flags);
 230         for (i = 0; i < NUM_TX_QUEUES; i++)
 231                 wl->tx_queue_count[i] -= filtered[i];
 232         spin_unlock_irqrestore(&wl->wl_lock, flags);
 233
 234         wl1271_handle_tx_low_watermark(wl);
 235 }
 236
 237 void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 238                           u8 hlid, bool clean_queues)
 239 {
 240         struct ieee80211_sta *sta;
 241         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 242
 243         if (test_bit(hlid, &wl->ap_ps_map))
 244                 return;
 245
 246         wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d "
 247                      "clean_queues %d", hlid, wl->links[hlid].allocated_pkts,
 248                      clean_queues);
 249
 250         rcu_read_lock();
 251         sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
 252         if (!sta) {
 253                 wl1271_error("could not find sta %pM for starting ps",
 254                              wl->links[hlid].addr);
 255                 rcu_read_unlock();
 256                 return;
 257         }
 258
 259         ieee80211_sta_ps_transition_ni(sta, true);
 260         rcu_read_unlock();
 261
 262         /* do we want to filter all frames from this link's queues? */
 263         if (clean_queues)
 264                 wl1271_ps_filter_frames(wl, hlid);
 265
 266         __set_bit(hlid, &wl->ap_ps_map);
 267 }
 268
 269 void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid)
 270 {
 271         struct ieee80211_sta *sta;
 272         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 273
 274         if (!test_bit(hlid, &wl->ap_ps_map))
 275                 return;
 276
 277         wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
 278
 279         __clear_bit(hlid, &wl->ap_ps_map);
 280
 281         rcu_read_lock();
 282         sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
 283         if (!sta) {
 284                 wl1271_error("could not find sta %pM for ending ps",
 285                              wl->links[hlid].addr);
 286                 goto end;
 287         }
 288
 289         ieee80211_sta_ps_transition_ni(sta, false);
 290 end:
 291         rcu_read_unlock();
 292 }