drivers/net/wireless/wl12xx/wl1271_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 "wl1271_reg.h"
  25 #include "wl1271_ps.h"
  26 #include "wl1271_io.h"
  27
  28 #define WL1271_WAKEUP_TIMEOUT 500
  29
  30 void wl1271_elp_work(struct work_struct *work)
  31 {
  32         struct delayed_work *dwork;
  33         struct wl1271 *wl;
  34
  35         dwork = container_of(work, struct delayed_work, work);
  36         wl = container_of(dwork, struct wl1271, elp_work);
  37
  38         wl1271_debug(DEBUG_PSM, "elp work");
  39
  40         mutex_lock(&wl->mutex);
  41
  42         if (unlikely(wl->state == WL1271_STATE_OFF))
  43                 goto out;
  44
  45         if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags) ||
  46             (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
  47              !test_bit(WL1271_FLAG_IDLE, &wl->flags)))
  48                 goto out;
  49
  50         wl1271_debug(DEBUG_PSM, "chip to elp");
  51         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
  52         set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
  53
  54 out:
  55         mutex_unlock(&wl->mutex);
  56 }
  57
  58 #define ELP_ENTRY_DELAY  5
  59
  60 /* Routines to toggle sleep mode while in ELP */
  61 void wl1271_ps_elp_sleep(struct wl1271 *wl)
  62 {
  63         if (test_bit(WL1271_FLAG_PSM, &wl->flags) ||
  64             test_bit(WL1271_FLAG_IDLE, &wl->flags)) {
  65                 cancel_delayed_work(&wl->elp_work);
  66                 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
  67                                              msecs_to_jiffies(ELP_ENTRY_DELAY));
  68         }
  69 }
  70
  71 int wl1271_ps_elp_wakeup(struct wl1271 *wl, bool chip_awake)
  72 {
  73         DECLARE_COMPLETION_ONSTACK(compl);
  74         unsigned long flags;
  75         int ret;
  76         u32 start_time = jiffies;
  77         bool pending = false;
  78
  79         if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
  80                 return 0;
  81
  82         wl1271_debug(DEBUG_PSM, "waking up chip from elp");
  83
  84         /*
  85          * The spinlock is required here to synchronize both the work and
  86          * the completion variable in one entity.
  87          */
  88         spin_lock_irqsave(&wl->wl_lock, flags);
  89         if (work_pending(&wl->irq_work) || chip_awake)
  90                 pending = true;
  91         else
  92                 wl->elp_compl = &compl;
  93         spin_unlock_irqrestore(&wl->wl_lock, flags);
  94
  95         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
  96
  97         if (!pending) {
  98                 ret = wait_for_completion_timeout(
  99                         &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
 100                 if (ret == 0) {
 101                         wl1271_error("ELP wakeup timeout!");
 102                         ieee80211_queue_work(wl->hw, &wl->recovery_work);
 103                         ret = -ETIMEDOUT;
 104                         goto err;
 105                 } else if (ret < 0) {
 106                         wl1271_error("ELP wakeup completion error.");
 107                         goto err;
 108                 }
 109         }
 110
 111         clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 112
 113         wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
 114                      jiffies_to_msecs(jiffies - start_time));
 115         goto out;
 116
 117 err:
 118         spin_lock_irqsave(&wl->wl_lock, flags);
 119         wl->elp_compl = NULL;
 120         spin_unlock_irqrestore(&wl->wl_lock, flags);
 121         return ret;
 122
 123 out:
 124         return 0;
 125 }
 126
 127 int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
 128                        u32 rates, bool send)
 129 {
 130         int ret;
 131
 132         switch (mode) {
 133         case STATION_POWER_SAVE_MODE:
 134                 wl1271_debug(DEBUG_PSM, "entering psm");
 135
 136                 ret = wl1271_acx_wake_up_conditions(wl);
 137                 if (ret < 0) {
 138                         wl1271_error("couldn't set wake up conditions");
 139                         return ret;
 140                 }
 141
 142                 ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE,
 143                                          rates, send);
 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, false);
 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                                          rates, send);
 168                 if (ret < 0)
 169                         return ret;
 170
 171                 clear_bit(WL1271_FLAG_PSM, &wl->flags);
 172                 break;
 173         }
 174
 175         return ret;
 176 }
 177
 178