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                 cancel_delayed_work(&wl->elp_work);
  64                 delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
  65                 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
  66         }
  67 }
  68
  69 int wl1251_ps_elp_wakeup(struct wl1251 *wl)
  70 {
  71         unsigned long timeout, start;
  72         u32 elp_reg;
  73
  74         if (!wl->elp)
  75                 return 0;
  76
  77         wl1251_debug(DEBUG_PSM, "waking up chip from elp");
  78
  79         start = jiffies;
  80         timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
  81
  82         wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
  83
  84         elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
  85
  86         /*
  87          * FIXME: we should wait for irq from chip but, as a temporary
  88          * solution to simplify locking, let's poll instead
  89          */
  90         while (!(elp_reg & ELPCTRL_WLAN_READY)) {
  91                 if (time_after(jiffies, timeout)) {
  92                         wl1251_error("elp wakeup timeout");
  93                         return -ETIMEDOUT;
  94                 }
  95                 msleep(1);
  96                 elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
  97         }
  98
  99         wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
 100                      jiffies_to_msecs(jiffies - start));
 101
 102         wl->elp = false;
 103
 104         return 0;
 105 }
 106
 107 static int wl1251_ps_set_elp(struct wl1251 *wl, bool enable)
 108 {
 109         int ret;
 110
 111         if (enable) {
 112                 wl1251_debug(DEBUG_PSM, "sleep auth psm/elp");
 113
 114                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
 115                 if (ret < 0)
 116                         return ret;
 117
 118                 wl1251_ps_elp_sleep(wl);
 119         } else {
 120                 wl1251_debug(DEBUG_PSM, "sleep auth cam");
 121
 122                 /*
 123                  * When the target is in ELP, we can only
 124                  * access the ELP control register. Thus,
 125                  * we have to wake the target up before
 126                  * changing the power authorization.
 127                  */
 128
 129                 wl1251_ps_elp_wakeup(wl);
 130
 131                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
 132                 if (ret < 0)
 133                         return ret;
 134         }
 135
 136         return 0;
 137 }
 138
 139 int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_cmd_ps_mode mode)
 140 {
 141         int ret;
 142
 143         switch (mode) {
 144         case STATION_POWER_SAVE_MODE:
 145                 wl1251_debug(DEBUG_PSM, "entering psm");
 146
 147                 /* enable beacon filtering */
 148                 ret = wl1251_acx_beacon_filter_opt(wl, true);
 149                 if (ret < 0)
 150                         return ret;
 151
 152                 ret = wl1251_acx_wake_up_conditions(wl,
 153                                                     WAKE_UP_EVENT_DTIM_BITMAP,
 154                                                     wl->listen_int);
 155                 if (ret < 0)
 156                         return ret;
 157
 158                 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE,
 159                                             WL1251_DEFAULT_BET_CONSECUTIVE);
 160                 if (ret < 0)
 161                         return ret;
 162
 163                 ret = wl1251_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
 164                 if (ret < 0)
 165                         return ret;
 166
 167                 ret = wl1251_ps_set_elp(wl, true);
 168                 if (ret < 0)
 169                         return ret;
 170
 171                 wl->psm = 1;
 172                 break;
 173         case STATION_ACTIVE_MODE:
 174         default:
 175                 wl1251_debug(DEBUG_PSM, "leaving psm");
 176                 ret = wl1251_ps_set_elp(wl, false);
 177                 if (ret < 0)
 178                         return ret;
 179
 180                 /* disable BET */
 181                 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE,
 182                                             WL1251_DEFAULT_BET_CONSECUTIVE);
 183                 if (ret < 0)
 184                         return ret;
 185
 186                 /* disable beacon filtering */
 187                 ret = wl1251_acx_beacon_filter_opt(wl, false);
 188                 if (ret < 0)
 189                         return ret;
 190
 191                 ret = wl1251_acx_wake_up_conditions(wl,
 192                                                     WAKE_UP_EVENT_DTIM_BITMAP,
 193                                                     wl->listen_int);
 194                 if (ret < 0)
 195                         return ret;
 196
 197                 ret = wl1251_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
 198                 if (ret < 0)
 199                         return ret;
 200
 201                 wl->psm = 0;
 202                 break;
 203         }
 204
 205         return ret;
 206 }
 207