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         if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags) ||
  47             (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
  48              !test_bit(WL1271_FLAG_IDLE, &wl->flags)))
  49                 goto out;
  50
  51         wl1271_debug(DEBUG_PSM, "chip to elp");
  52         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
  53         set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
  54
  55 out:
  56         mutex_unlock(&wl->mutex);
  57 }
  58
  59 #define ELP_ENTRY_DELAY  5
  60
  61 /* Routines to toggle sleep mode while in ELP */
  62 void wl1271_ps_elp_sleep(struct wl1271 *wl)
  63 {
  64         if (test_bit(WL1271_FLAG_PSM, &wl->flags) ||
  65             test_bit(WL1271_FLAG_IDLE, &wl->flags)) {
  66                 cancel_delayed_work(&wl->elp_work);
  67                 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
  68                                              msecs_to_jiffies(ELP_ENTRY_DELAY));
  69         }
  70 }
  71
  72 int wl1271_ps_elp_wakeup(struct wl1271 *wl)
  73 {
  74         DECLARE_COMPLETION_ONSTACK(compl);
  75         unsigned long flags;
  76         int ret;
  77         u32 start_time = jiffies;
  78         bool pending = false;
  79
  80         if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
  81                 return 0;
  82
  83         wl1271_debug(DEBUG_PSM, "waking up chip from elp");
  84
  85         /*
  86          * The spinlock is required here to synchronize both the work and
  87          * the completion variable in one entity.
  88          */
  89         spin_lock_irqsave(&wl->wl_lock, flags);
  90         if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
  91                 pending = true;
  92         else
  93                 wl->elp_compl = &compl;
  94         spin_unlock_irqrestore(&wl->wl_lock, flags);
  95
  96         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
  97
  98         if (!pending) {
  99                 ret = wait_for_completion_timeout(
 100                         &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
 101                 if (ret == 0) {
 102                         wl1271_error("ELP wakeup timeout!");
 103                         ieee80211_queue_work(wl->hw, &wl->recovery_work);
 104                         ret = -ETIMEDOUT;
 105                         goto err;
 106                 } else if (ret < 0) {
 107                         wl1271_error("ELP wakeup completion error.");
 108                         goto err;
 109                 }
 110         }
 111
 112         clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 113
 114         wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
 115                      jiffies_to_msecs(jiffies - start_time));
 116         goto out;
 117
 118 err:
 119         spin_lock_irqsave(&wl->wl_lock, flags);
 120         wl->elp_compl = NULL;
 121         spin_unlock_irqrestore(&wl->wl_lock, flags);
 122         return ret;
 123
 124 out:
 125         return 0;
 126 }
 127
 128 int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
 129                        u32 rates, bool send)
 130 {
 131         int ret;
 132
 133         switch (mode) {
 134         case STATION_POWER_SAVE_MODE:
 135                 wl1271_debug(DEBUG_PSM, "entering psm");
 136
 137                 ret = wl1271_acx_wake_up_conditions(wl);
 138                 if (ret < 0) {
 139                         wl1271_error("couldn't set wake up conditions");
 140                         return ret;
 141                 }
 142
 143                 ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
 144                 if (ret < 0)
 145                         return ret;
 146
 147                 set_bit(WL1271_FLAG_PSM, &wl->flags);
 148                 break;
 149         case STATION_ACTIVE_MODE:
 150         default:
 151                 wl1271_debug(DEBUG_PSM, "leaving psm");
 152                 ret = wl1271_ps_elp_wakeup(wl);
 153                 if (ret < 0)
 154                         return ret;
 155
 156                 /* disable beacon early termination */
 157                 ret = wl1271_acx_bet_enable(wl, false);
 158                 if (ret < 0)
 159                         return ret;
 160
 161                 /* disable beacon filtering */
 162                 ret = wl1271_acx_beacon_filter_opt(wl, false);
 163                 if (ret < 0)
 164                         return ret;
 165
 166                 ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
 167                 if (ret < 0)
 168                         return ret;
 169
 170                 clear_bit(WL1271_FLAG_PSM, &wl->flags);
 171                 break;
 172         }
 173
 174         return ret;
 175 }
 176
 177 static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
 178 {
 179         int i, filtered = 0;
 180         struct sk_buff *skb;
 181         struct ieee80211_tx_info *info;
 182         unsigned long flags;
 183
 184         /* filter all frames currently the low level queus for this hlid */
 185         for (i = 0; i < NUM_TX_QUEUES; i++) {
 186                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 187                         info = IEEE80211_SKB_CB(skb);
 188                         info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 189                         info->status.rates[0].idx = -1;
 190                         ieee80211_tx_status(wl->hw, skb);
 191                         filtered++;
 192                 }
 193         }
 194
 195         spin_lock_irqsave(&wl->wl_lock, flags);
 196         wl->tx_queue_count -= filtered;
 197         spin_unlock_irqrestore(&wl->wl_lock, flags);
 198
 199         wl1271_handle_tx_low_watermark(wl);
 200 }
 201
 202 void wl1271_ps_link_start(struct wl1271 *wl, u8 hlid, bool clean_queues)
 203 {
 204         struct ieee80211_sta *sta;
 205
 206         if (test_bit(hlid, &wl->ap_ps_map))
 207                 return;
 208
 209         wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d blks %d "
 210                      "clean_queues %d", hlid, wl->links[hlid].allocated_blks,
 211                      clean_queues);
 212
 213         rcu_read_lock();
 214         sta = ieee80211_find_sta(wl->vif, wl->links[hlid].addr);
 215         if (!sta) {
 216                 wl1271_error("could not find sta %pM for starting ps",
 217                              wl->links[hlid].addr);
 218                 rcu_read_unlock();
 219                 return;
 220         }
 221
 222         ieee80211_sta_ps_transition_ni(sta, true);
 223         rcu_read_unlock();
 224
 225         /* do we want to filter all frames from this link's queues? */
 226         if (clean_queues)
 227                 wl1271_ps_filter_frames(wl, hlid);
 228
 229         __set_bit(hlid, &wl->ap_ps_map);
 230 }
 231
 232 void wl1271_ps_link_end(struct wl1271 *wl, u8 hlid)
 233 {
 234         struct ieee80211_sta *sta;
 235
 236         if (!test_bit(hlid, &wl->ap_ps_map))
 237                 return;
 238
 239         wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
 240
 241         __clear_bit(hlid, &wl->ap_ps_map);
 242
 243         rcu_read_lock();
 244         sta = ieee80211_find_sta(wl->vif, wl->links[hlid].addr);
 245         if (!sta) {
 246                 wl1271_error("could not find sta %pM for ending ps",
 247                              wl->links[hlid].addr);
 248                 goto end;
 249         }
 250
 251         ieee80211_sta_ps_transition_ni(sta, false);
 252 end:
 253         rcu_read_unlock();
 254 }