release/src-rt-6.x.4708/linux/linux-2.6.36/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 (test_bit(WL1271_FLAG_IN_ELP, &wl->flags) ||
  43             (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
  44              !test_bit(WL1271_FLAG_IDLE, &wl->flags)))
  45                 goto out;
  46
  47         wl1271_debug(DEBUG_PSM, "chip to elp");
  48         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
  49         set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
  50
  51 out:
  52         mutex_unlock(&wl->mutex);
  53 }
  54
  55 #define ELP_ENTRY_DELAY  5
  56
  57 /* Routines to toggle sleep mode while in ELP */
  58 void wl1271_ps_elp_sleep(struct wl1271 *wl)
  59 {
  60         if (test_bit(WL1271_FLAG_PSM, &wl->flags) ||
  61             test_bit(WL1271_FLAG_IDLE, &wl->flags)) {
  62                 cancel_delayed_work(&wl->elp_work);
  63                 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
  64                                         msecs_to_jiffies(ELP_ENTRY_DELAY));
  65         }
  66 }
  67
  68 int wl1271_ps_elp_wakeup(struct wl1271 *wl, bool chip_awake)
  69 {
  70         DECLARE_COMPLETION_ONSTACK(compl);
  71         unsigned long flags;
  72         int ret;
  73         u32 start_time = jiffies;
  74         bool pending = false;
  75
  76         if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
  77                 return 0;
  78
  79         wl1271_debug(DEBUG_PSM, "waking up chip from elp");
  80
  81         /*
  82          * The spinlock is required here to synchronize both the work and
  83          * the completion variable in one entity.
  84          */
  85         spin_lock_irqsave(&wl->wl_lock, flags);
  86         if (work_pending(&wl->irq_work) || chip_awake)
  87                 pending = true;
  88         else
  89                 wl->elp_compl = &compl;
  90         spin_unlock_irqrestore(&wl->wl_lock, flags);
  91
  92         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
  93
  94         if (!pending) {
  95                 ret = wait_for_completion_timeout(
  96                         &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
  97                 if (ret == 0) {
  98                         wl1271_error("ELP wakeup timeout!");
  99                         ret = -ETIMEDOUT;
 100                         goto err;
 101                 } else if (ret < 0) {
 102                         wl1271_error("ELP wakeup completion error.");
 103                         goto err;
 104                 }
 105         }
 106
 107         clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 108
 109         wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
 110                      jiffies_to_msecs(jiffies - start_time));
 111         goto out;
 112
 113 err:
 114         spin_lock_irqsave(&wl->wl_lock, flags);
 115         wl->elp_compl = NULL;
 116         spin_unlock_irqrestore(&wl->wl_lock, flags);
 117         return ret;
 118
 119 out:
 120         return 0;
 121 }
 122
 123 int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
 124                        bool send)
 125 {
 126         int ret;
 127
 128         switch (mode) {
 129         case STATION_POWER_SAVE_MODE:
 130                 wl1271_debug(DEBUG_PSM, "entering psm");
 131
 132                 ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE, send);
 133                 if (ret < 0)
 134                         return ret;
 135
 136                 set_bit(WL1271_FLAG_PSM, &wl->flags);
 137                 break;
 138         case STATION_ACTIVE_MODE:
 139         default:
 140                 wl1271_debug(DEBUG_PSM, "leaving psm");
 141                 ret = wl1271_ps_elp_wakeup(wl, false);
 142                 if (ret < 0)
 143                         return ret;
 144
 145                 /* disable beacon early termination */
 146                 ret = wl1271_acx_bet_enable(wl, false);
 147                 if (ret < 0)
 148                         return ret;
 149
 150                 /* disable beacon filtering */
 151                 ret = wl1271_acx_beacon_filter_opt(wl, false);
 152                 if (ret < 0)
 153                         return ret;
 154
 155                 ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE, send);
 156                 if (ret < 0)
 157                         return ret;
 158
 159                 clear_bit(WL1271_FLAG_PSM, &wl->flags);
 160                 break;
 161         }
 162
 163         return ret;
 164 }