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_spi.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 (wl->elp || !wl->psm)
  43                 goto out;
  44
  45         wl1271_debug(DEBUG_PSM, "chip to elp");
  46         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
  47         wl->elp = true;
  48
  49 out:
  50         mutex_unlock(&wl->mutex);
  51 }
  52
  53 #define ELP_ENTRY_DELAY  5
  54
  55 /* Routines to toggle sleep mode while in ELP */
  56 void wl1271_ps_elp_sleep(struct wl1271 *wl)
  57 {
  58         if (wl->psm) {
  59                 cancel_delayed_work(&wl->elp_work);
  60                 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
  61                                         msecs_to_jiffies(ELP_ENTRY_DELAY));
  62         }
  63 }
  64
  65 int wl1271_ps_elp_wakeup(struct wl1271 *wl, bool chip_awake)
  66 {
  67         DECLARE_COMPLETION_ONSTACK(compl);
  68         unsigned long flags;
  69         int ret;
  70         u32 start_time = jiffies;
  71         bool pending = false;
  72
  73         if (!wl->elp)
  74                 return 0;
  75
  76         wl1271_debug(DEBUG_PSM, "waking up chip from elp");
  77
  78         /*
  79          * The spinlock is required here to synchronize both the work and
  80          * the completion variable in one entity.
  81          */
  82         spin_lock_irqsave(&wl->wl_lock, flags);
  83         if (work_pending(&wl->irq_work) || chip_awake)
  84                 pending = true;
  85         else
  86                 wl->elp_compl = &compl;
  87         spin_unlock_irqrestore(&wl->wl_lock, flags);
  88
  89         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
  90
  91         if (!pending) {
  92                 ret = wait_for_completion_timeout(
  93                         &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
  94                 if (ret == 0) {
  95                         wl1271_error("ELP wakeup timeout!");
  96                         ret = -ETIMEDOUT;
  97                         goto err;
  98                 } else if (ret < 0) {
  99                         wl1271_error("ELP wakeup completion error.");
 100                         goto err;
 101                 }
 102         }
 103
 104         wl->elp = false;
 105
 106         wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
 107                      jiffies_to_msecs(jiffies - start_time));
 108         goto out;
 109
 110 err:
 111         spin_lock_irqsave(&wl->wl_lock, flags);
 112         wl->elp_compl = NULL;
 113         spin_unlock_irqrestore(&wl->wl_lock, flags);
 114         return ret;
 115
 116 out:
 117         return 0;
 118 }
 119
 120 int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode)
 121 {
 122         int ret;
 123
 124         switch (mode) {
 125         case STATION_POWER_SAVE_MODE:
 126                 wl1271_debug(DEBUG_PSM, "entering psm");
 127
 128                 /* enable beacon filtering */
 129                 ret = wl1271_acx_beacon_filter_opt(wl, true);
 130                 if (ret < 0)
 131                         return ret;
 132
 133                 ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
 134                 if (ret < 0)
 135                         return ret;
 136
 137                 wl1271_ps_elp_sleep(wl);
 138                 if (ret < 0)
 139                         return ret;
 140
 141                 wl->psm = 1;
 142                 break;
 143         case STATION_ACTIVE_MODE:
 144         default:
 145                 wl1271_debug(DEBUG_PSM, "leaving psm");
 146                 ret = wl1271_ps_elp_wakeup(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);
 156                 if (ret < 0)
 157                         return ret;
 158
 159                 wl->psm = 0;
 160                 break;
 161         }
 162
 163         return ret;
 164 }
 165
 166