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
  29 #define WL1271_WAKEUP_TIMEOUT 500
  30
  31 void wl1271_elp_work(struct work_struct *work)
  32 {
  33         struct delayed_work *dwork;
  34         struct wl1271 *wl;
  35
  36         dwork = container_of(work, struct delayed_work, work);
  37         wl = container_of(dwork, struct wl1271, elp_work);
  38
  39         wl1271_debug(DEBUG_PSM, "elp work");
  40
  41         mutex_lock(&wl->mutex);
  42
  43         if (unlikely(wl->state == WL1271_STATE_OFF))
  44                 goto out;
  45
  46         /* our work might have been already cancelled */
  47         if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
  48                 goto out;
  49
  50         if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags) ||
  51             (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
  52              !test_bit(WL1271_FLAG_IDLE, &wl->flags)))
  53                 goto out;
  54
  55         wl1271_debug(DEBUG_PSM, "chip to elp");
  56         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
  57         set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
  58
  59 out:
  60         mutex_unlock(&wl->mutex);
  61 }
  62
  63 #define ELP_ENTRY_DELAY  5
  64
  65 /* Routines to toggle sleep mode while in ELP */
  66 void wl1271_ps_elp_sleep(struct wl1271 *wl)
  67 {
  68         /* we shouldn't get consecutive sleep requests */
  69         if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
  70                 return;
  71
  72         if (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
  73             !test_bit(WL1271_FLAG_IDLE, &wl->flags))
  74                 return;
  75
  76         ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
  77                                      msecs_to_jiffies(ELP_ENTRY_DELAY));
  78 }
  79
  80 int wl1271_ps_elp_wakeup(struct wl1271 *wl)
  81 {
  82         DECLARE_COMPLETION_ONSTACK(compl);
  83         unsigned long flags;
  84         int ret;
  85         u32 start_time = jiffies;
  86         bool pending = false;
  87
  88         /*
  89          * we might try to wake up even if we didn't go to sleep
  90          * before (e.g. on boot)
  91          */
  92         if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))
  93                 return 0;
  94
  95         /* don't cancel_sync as it might contend for a mutex and deadlock */
  96         cancel_delayed_work(&wl->elp_work);
  97
  98         if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
  99                 return 0;
 100
 101         wl1271_debug(DEBUG_PSM, "waking up chip from elp");
 102
 103         /*
 104          * The spinlock is required here to synchronize both the work and
 105          * the completion variable in one entity.
 106          */
 107         spin_lock_irqsave(&wl->wl_lock, flags);
 108         if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
 109                 pending = true;
 110         else
 111                 wl->elp_compl = &compl;
 112         spin_unlock_irqrestore(&wl->wl_lock, flags);
 113
 114         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
 115
 116         if (!pending) {
 117                 ret = wait_for_completion_timeout(
 118                         &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
 119                 if (ret == 0) {
 120                         wl1271_error("ELP wakeup timeout!");
 121                         ieee80211_queue_work(wl->hw, &wl->recovery_work);
 122                         ret = -ETIMEDOUT;
 123                         goto err;
 124                 } else if (ret < 0) {
 125                         wl1271_error("ELP wakeup completion error.");
 126                         goto err;
 127                 }
 128         }
 129
 130         clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 131
 132         wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
 133                      jiffies_to_msecs(jiffies - start_time));
 134         goto out;
 135
 136 err:
 137         spin_lock_irqsave(&wl->wl_lock, flags);
 138         wl->elp_compl = NULL;
 139         spin_unlock_irqrestore(&wl->wl_lock, flags);
 140         return ret;
 141
 142 out:
 143         return 0;
 144 }
 145
 146 int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
 147                        u32 rates, bool send)
 148 {
 149         int ret;
 150
 151         switch (mode) {
 152         case STATION_POWER_SAVE_MODE:
 153                 wl1271_debug(DEBUG_PSM, "entering psm");
 154
 155                 ret = wl1271_acx_wake_up_conditions(wl);
 156                 if (ret < 0) {
 157                         wl1271_error("couldn't set wake up conditions");
 158                         return ret;
 159                 }
 160
 161                 ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
 162                 if (ret < 0)
 163                         return ret;
 164
 165                 set_bit(WL1271_FLAG_PSM, &wl->flags);
 166                 break;
 167         case STATION_ACTIVE_MODE:
 168         default:
 169                 wl1271_debug(DEBUG_PSM, "leaving psm");
 170
 171                 /* disable beacon early termination */
 172                 if (wl->band == IEEE80211_BAND_2GHZ) {
 173                         ret = wl1271_acx_bet_enable(wl, false);
 174                         if (ret < 0)
 175                                 return ret;
 176                 }
 177
 178                 /* disable beacon filtering */
 179                 ret = wl1271_acx_beacon_filter_opt(wl, false);
 180                 if (ret < 0)
 181                         return ret;
 182
 183                 ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
 184                 if (ret < 0)
 185                         return ret;
 186
 187                 clear_bit(WL1271_FLAG_PSM, &wl->flags);
 188                 break;
 189         }
 190
 191         return ret;
 192 }
 193
 194 static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
 195 {
 196         int i, filtered = 0;
 197         struct sk_buff *skb;
 198         struct ieee80211_tx_info *info;
 199         unsigned long flags;
 200
 201         /* filter all frames currently the low level queus for this hlid */
 202         for (i = 0; i < NUM_TX_QUEUES; i++) {
 203                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 204                         info = IEEE80211_SKB_CB(skb);
 205                         info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 206                         info->status.rates[0].idx = -1;
 207                         ieee80211_tx_status_ni(wl->hw, skb);
 208                         filtered++;
 209                 }
 210         }
 211
 212         spin_lock_irqsave(&wl->wl_lock, flags);
 213         wl->tx_queue_count -= filtered;
 214         spin_unlock_irqrestore(&wl->wl_lock, flags);
 215
 216         wl1271_handle_tx_low_watermark(wl);
 217 }
 218
 219 void wl1271_ps_link_start(struct wl1271 *wl, u8 hlid, bool clean_queues)
 220 {
 221         struct ieee80211_sta *sta;
 222
 223         if (test_bit(hlid, &wl->ap_ps_map))
 224                 return;
 225
 226         wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d blks %d "
 227                      "clean_queues %d", hlid, wl->links[hlid].allocated_blks,
 228                      clean_queues);
 229
 230         rcu_read_lock();
 231         sta = ieee80211_find_sta(wl->vif, wl->links[hlid].addr);
 232         if (!sta) {
 233                 wl1271_error("could not find sta %pM for starting ps",
 234                              wl->links[hlid].addr);
 235                 rcu_read_unlock();
 236                 return;
 237         }
 238
 239         ieee80211_sta_ps_transition_ni(sta, true);
 240         rcu_read_unlock();
 241
 242         /* do we want to filter all frames from this link's queues? */
 243         if (clean_queues)
 244                 wl1271_ps_filter_frames(wl, hlid);
 245
 246         __set_bit(hlid, &wl->ap_ps_map);
 247 }
 248
 249 void wl1271_ps_link_end(struct wl1271 *wl, u8 hlid)
 250 {
 251         struct ieee80211_sta *sta;
 252
 253         if (!test_bit(hlid, &wl->ap_ps_map))
 254                 return;
 255
 256         wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
 257
 258         __clear_bit(hlid, &wl->ap_ps_map);
 259
 260         rcu_read_lock();
 261         sta = ieee80211_find_sta(wl->vif, wl->links[hlid].addr);
 262         if (!sta) {
 263                 wl1271_error("could not find sta %pM for ending ps",
 264                              wl->links[hlid].addr);
 265                 goto end;
 266         }
 267
 268         ieee80211_sta_ps_transition_ni(sta, false);
 269 end:
 270         rcu_read_unlock();
 271 }