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  5
  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 == WL1271_STATE_OFF))
  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         if (wl->conf.conn.forced_ps)
 102                 timeout = ELP_ENTRY_DELAY;
 103         else
 104                 timeout = wl->conf.conn.dynamic_ps_timeout;
 105
 106         ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
 107                                      msecs_to_jiffies(timeout));
 108 }
 109
 110 int wl1271_ps_elp_wakeup(struct wl1271 *wl)
 111 {
 112         DECLARE_COMPLETION_ONSTACK(compl);
 113         unsigned long flags;
 114         int ret;
 115         u32 start_time = jiffies;
 116         bool pending = false;
 117
 118         /*
 119          * we might try to wake up even if we didn't go to sleep
 120          * before (e.g. on boot)
 121          */
 122         if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))
 123                 return 0;
 124
 125         /* don't cancel_sync as it might contend for a mutex and deadlock */
 126         cancel_delayed_work(&wl->elp_work);
 127
 128         if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
 129                 return 0;
 130
 131         wl1271_debug(DEBUG_PSM, "waking up chip from elp");
 132
 133         /*
 134          * The spinlock is required here to synchronize both the work and
 135          * the completion variable in one entity.
 136          */
 137         spin_lock_irqsave(&wl->wl_lock, flags);
 138         if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
 139                 pending = true;
 140         else
 141                 wl->elp_compl = &compl;
 142         spin_unlock_irqrestore(&wl->wl_lock, flags);
 143
 144         ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_WAKE_UP);
 145         if (ret < 0) {
 146                 wl12xx_queue_recovery_work(wl);
 147                 goto err;
 148         }
 149
 150         if (!pending) {
 151                 ret = wait_for_completion_timeout(
 152                         &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
 153                 if (ret == 0) {
 154                         wl1271_error("ELP wakeup timeout!");
 155                         wl12xx_queue_recovery_work(wl);
 156                         ret = -ETIMEDOUT;
 157                         goto err;
 158                 } else if (ret < 0) {
 159                         wl1271_error("ELP wakeup completion error.");
 160                         goto err;
 161                 }
 162         }
 163
 164         clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 165
 166         wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
 167                      jiffies_to_msecs(jiffies - start_time));
 168         goto out;
 169
 170 err:
 171         spin_lock_irqsave(&wl->wl_lock, flags);
 172         wl->elp_compl = NULL;
 173         spin_unlock_irqrestore(&wl->wl_lock, flags);
 174         return ret;
 175
 176 out:
 177         return 0;
 178 }
 179
 180 int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 181                        enum wl1271_cmd_ps_mode mode)
 182 {
 183         int ret;
 184         u16 timeout = wl->conf.conn.dynamic_ps_timeout;
 185
 186         switch (mode) {
 187         case STATION_AUTO_PS_MODE:
 188         case STATION_POWER_SAVE_MODE:
 189                 wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)",
 190                              mode, timeout);
 191
 192                 ret = wl1271_acx_wake_up_conditions(wl, wlvif,
 193                                             wl->conf.conn.wake_up_event,
 194                                             wl->conf.conn.listen_interval);
 195                 if (ret < 0) {
 196                         wl1271_error("couldn't set wake up conditions");
 197                         return ret;
 198                 }
 199
 200                 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout);
 201                 if (ret < 0)
 202                         return ret;
 203
 204                 set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
 205
 206                 /*
 207                  * enable beacon early termination.
 208                  * Not relevant for 5GHz and for high rates.
 209                  */
 210                 if ((wlvif->band == IEEE80211_BAND_2GHZ) &&
 211                     (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
 212                         ret = wl1271_acx_bet_enable(wl, wlvif, true);
 213                         if (ret < 0)
 214                                 return ret;
 215                 }
 216                 break;
 217         case STATION_ACTIVE_MODE:
 218                 wl1271_debug(DEBUG_PSM, "leaving psm");
 219
 220                 /* disable beacon early termination */
 221                 if ((wlvif->band == IEEE80211_BAND_2GHZ) &&
 222                     (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
 223                         ret = wl1271_acx_bet_enable(wl, wlvif, false);
 224                         if (ret < 0)
 225                                 return ret;
 226                 }
 227
 228                 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0);
 229                 if (ret < 0)
 230                         return ret;
 231
 232                 clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
 233                 break;
 234         default:
 235                 wl1271_warning("trying to set ps to unsupported mode %d", mode);
 236                 ret = -EINVAL;
 237         }
 238
 239         return ret;
 240 }
 241
 242 static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
 243 {
 244         int i;
 245         struct sk_buff *skb;
 246         struct ieee80211_tx_info *info;
 247         unsigned long flags;
 248         int filtered[NUM_TX_QUEUES];
 249
 250         /* filter all frames currently in the low level queues for this hlid */
 251         for (i = 0; i < NUM_TX_QUEUES; i++) {
 252                 filtered[i] = 0;
 253                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 254                         filtered[i]++;
 255
 256                         if (WARN_ON(wl12xx_is_dummy_packet(wl, skb)))
 257                                 continue;
 258
 259                         info = IEEE80211_SKB_CB(skb);
 260                         info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 261                         info->status.rates[0].idx = -1;
 262                         ieee80211_tx_status_ni(wl->hw, skb);
 263                 }
 264         }
 265
 266         spin_lock_irqsave(&wl->wl_lock, flags);
 267         for (i = 0; i < NUM_TX_QUEUES; i++)
 268                 wl->tx_queue_count[i] -= filtered[i];
 269         spin_unlock_irqrestore(&wl->wl_lock, flags);
 270
 271         wl1271_handle_tx_low_watermark(wl);
 272 }
 273
 274 void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 275                           u8 hlid, bool clean_queues)
 276 {
 277         struct ieee80211_sta *sta;
 278         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 279
 280         if (test_bit(hlid, &wl->ap_ps_map))
 281                 return;
 282
 283         wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d "
 284                      "clean_queues %d", hlid, wl->links[hlid].allocated_pkts,
 285                      clean_queues);
 286
 287         rcu_read_lock();
 288         sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
 289         if (!sta) {
 290                 wl1271_error("could not find sta %pM for starting ps",
 291                              wl->links[hlid].addr);
 292                 rcu_read_unlock();
 293                 return;
 294         }
 295
 296         ieee80211_sta_ps_transition_ni(sta, true);
 297         rcu_read_unlock();
 298
 299         /* do we want to filter all frames from this link's queues? */
 300         if (clean_queues)
 301                 wl1271_ps_filter_frames(wl, hlid);
 302
 303         __set_bit(hlid, &wl->ap_ps_map);
 304 }
 305
 306 void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid)
 307 {
 308         struct ieee80211_sta *sta;
 309         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 310
 311         if (!test_bit(hlid, &wl->ap_ps_map))
 312                 return;
 313
 314         wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
 315
 316         __clear_bit(hlid, &wl->ap_ps_map);
 317
 318         rcu_read_lock();
 319         sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
 320         if (!sta) {
 321                 wl1271_error("could not find sta %pM for ending ps",
 322                              wl->links[hlid].addr);
 323                 goto end;
 324         }
 325
 326         ieee80211_sta_ps_transition_ni(sta, false);
 327 end:
 328         rcu_read_unlock();
 329 }