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 #include "wl1271_io.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 (test_bit(WL1271_FLAG_IN_ELP, &wl->flags) ||
  44             !test_bit(WL1271_FLAG_PSM, &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                 cancel_delayed_work(&wl->elp_work);
  62                 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
  63                                         msecs_to_jiffies(ELP_ENTRY_DELAY));
  64         }
  65 }
  66
  67 int wl1271_ps_elp_wakeup(struct wl1271 *wl, bool chip_awake)
  68 {
  69         DECLARE_COMPLETION_ONSTACK(compl);
  70         unsigned long flags;
  71         int ret;
  72         u32 start_time = jiffies;
  73         bool pending = false;
  74
  75         if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
  76                 return 0;
  77
  78         wl1271_debug(DEBUG_PSM, "waking up chip from elp");
  79
  80         /*
  81          * The spinlock is required here to synchronize both the work and
  82          * the completion variable in one entity.
  83          */
  84         spin_lock_irqsave(&wl->wl_lock, flags);
  85         if (work_pending(&wl->irq_work) || chip_awake)
  86                 pending = true;
  87         else
  88                 wl->elp_compl = &compl;
  89         spin_unlock_irqrestore(&wl->wl_lock, flags);
  90
  91         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
  92
  93         if (!pending) {
  94                 ret = wait_for_completion_timeout(
  95                         &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
  96                 if (ret == 0) {
  97                         wl1271_error("ELP wakeup timeout!");
  98                         ret = -ETIMEDOUT;
  99                         goto err;
 100                 } else if (ret < 0) {
 101                         wl1271_error("ELP wakeup completion error.");
 102                         goto err;
 103                 }
 104         }
 105
 106         clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 107
 108         wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
 109                      jiffies_to_msecs(jiffies - start_time));
 110         goto out;
 111
 112 err:
 113         spin_lock_irqsave(&wl->wl_lock, flags);
 114         wl->elp_compl = NULL;
 115         spin_unlock_irqrestore(&wl->wl_lock, flags);
 116         return ret;
 117
 118 out:
 119         return 0;
 120 }
 121
 122 int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
 123                        bool send)
 124 {
 125         int ret;
 126
 127         switch (mode) {
 128         case STATION_POWER_SAVE_MODE:
 129                 wl1271_debug(DEBUG_PSM, "entering psm");
 130
 131                 ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE, send);
 132                 if (ret < 0)
 133                         return ret;
 134
 135                 set_bit(WL1271_FLAG_PSM, &wl->flags);
 136                 break;
 137         case STATION_ACTIVE_MODE:
 138         default:
 139                 wl1271_debug(DEBUG_PSM, "leaving psm");
 140                 ret = wl1271_ps_elp_wakeup(wl, false);
 141                 if (ret < 0)
 142                         return ret;
 143
 144                 /* disable beacon early termination */
 145                 ret = wl1271_acx_bet_enable(wl, false);
 146                 if (ret < 0)
 147                         return ret;
 148
 149                 /* disable beacon filtering */
 150                 ret = wl1271_acx_beacon_filter_opt(wl, false);
 151                 if (ret < 0)
 152                         return ret;
 153
 154                 ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE, send);
 155                 if (ret < 0)
 156                         return ret;
 157
 158                 clear_bit(WL1271_FLAG_PSM, &wl->flags);
 159                 break;
 160         }
 161
 162         return ret;
 163 }
 164
 165