drivers/net/wireless/wl12xx/wl1251_ps.c

   1 /*
   2  * This file is part of wl1251
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  *
   6  * Contact: Kalle Valo <kalle.valo@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 "wl1251_reg.h"
  25 #include "wl1251_ps.h"
  26 #include "wl1251_cmd.h"
  27 #include "wl1251_io.h"
  28
  29 /* in ms */
  30 #define WL1251_WAKEUP_TIMEOUT 100
  31
  32 void wl1251_elp_work(struct work_struct *work)
  33 {
  34         struct delayed_work *dwork;
  35         struct wl1251 *wl;
  36
  37         dwork = container_of(work, struct delayed_work, work);
  38         wl = container_of(dwork, struct wl1251, elp_work);
  39
  40         wl1251_debug(DEBUG_PSM, "elp work");
  41
  42         mutex_lock(&wl->mutex);
  43
  44         if (wl->elp || !wl->psm)
  45                 goto out;
  46
  47         wl1251_debug(DEBUG_PSM, "chip to elp");
  48         wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
  49         wl->elp = true;
  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 wl1251_ps_elp_sleep(struct wl1251 *wl)
  59 {
  60         unsigned long delay;
  61
  62         if (wl->psm) {
  63                 delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
  64                 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
  65         }
  66 }
  67
  68 int wl1251_ps_elp_wakeup(struct wl1251 *wl)
  69 {
  70         unsigned long timeout, start;
  71         u32 elp_reg;
  72
  73         if (delayed_work_pending(&wl->elp_work))
  74                 cancel_delayed_work(&wl->elp_work);
  75
  76         if (!wl->elp)
  77                 return 0;
  78
  79         wl1251_debug(DEBUG_PSM, "waking up chip from elp");
  80
  81         start = jiffies;
  82         timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
  83
  84         wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
  85
  86         elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
  87
  88         /*
  89          * FIXME: we should wait for irq from chip but, as a temporary
  90          * solution to simplify locking, let's poll instead
  91          */
  92         while (!(elp_reg & ELPCTRL_WLAN_READY)) {
  93                 if (time_after(jiffies, timeout)) {
  94                         wl1251_error("elp wakeup timeout");
  95                         return -ETIMEDOUT;
  96                 }
  97                 msleep(1);
  98                 elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
  99         }
 100
 101         wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
 102                      jiffies_to_msecs(jiffies - start));
 103
 104         wl->elp = false;
 105
 106         return 0;
 107 }
 108
 109 int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_cmd_ps_mode mode)
 110 {
 111         int ret;
 112
 113         switch (mode) {
 114         case STATION_POWER_SAVE_MODE:
 115                 wl1251_debug(DEBUG_PSM, "entering psm");
 116
 117                 /* enable beacon filtering */
 118                 ret = wl1251_acx_beacon_filter_opt(wl, true);
 119                 if (ret < 0)
 120                         return ret;
 121
 122                 ret = wl1251_acx_wake_up_conditions(wl,
 123                                                     WAKE_UP_EVENT_DTIM_BITMAP,
 124                                                     wl->listen_int);
 125                 if (ret < 0)
 126                         return ret;
 127
 128                 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE,
 129                                             WL1251_DEFAULT_BET_CONSECUTIVE);
 130                 if (ret < 0)
 131                         return ret;
 132
 133                 ret = wl1251_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
 134                 if (ret < 0)
 135                         return ret;
 136
 137                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
 138                 if (ret < 0)
 139                         return ret;
 140
 141                 wl->psm = 1;
 142                 break;
 143         case STATION_ACTIVE_MODE:
 144         default:
 145                 wl1251_debug(DEBUG_PSM, "leaving psm");
 146
 147                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
 148                 if (ret < 0)
 149                         return ret;
 150
 151                 /* disable BET */
 152                 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE,
 153                                             WL1251_DEFAULT_BET_CONSECUTIVE);
 154                 if (ret < 0)
 155                         return ret;
 156
 157                 /* disable beacon filtering */
 158                 ret = wl1251_acx_beacon_filter_opt(wl, false);
 159                 if (ret < 0)
 160                         return ret;
 161
 162                 ret = wl1251_acx_wake_up_conditions(wl,
 163                                                     WAKE_UP_EVENT_DTIM_BITMAP,
 164                                                     wl->listen_int);
 165                 if (ret < 0)
 166                         return ret;
 167
 168                 ret = wl1251_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
 169                 if (ret < 0)
 170                         return ret;
 171
 172                 wl->psm = 0;
 173                 break;
 174         }
 175
 176         return ret;
 177 }
 178