drivers/net/wireless/wl1251/ps.c

   1 /*
   2  * This file is part of wl1251
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  18  * 02110-1301 USA
  19  *
  20  */
  21
  22 #include "reg.h"
  23 #include "ps.h"
  24 #include "cmd.h"
  25 #include "io.h"
  26
  27 /* in ms */
  28 #define WL1251_WAKEUP_TIMEOUT 100
  29
  30 void wl1251_elp_work(struct work_struct *work)
  31 {
  32         struct delayed_work *dwork;
  33         struct wl1251 *wl;
  34
  35         dwork = container_of(work, struct delayed_work, work);
  36         wl = container_of(dwork, struct wl1251, elp_work);
  37
  38         wl1251_debug(DEBUG_PSM, "elp work");
  39
  40         mutex_lock(&wl->mutex);
  41
  42         if (wl->elp || wl->station_mode == STATION_ACTIVE_MODE)
  43                 goto out;
  44
  45         wl1251_debug(DEBUG_PSM, "chip to elp");
  46         wl1251_write_elp(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 wl1251_ps_elp_sleep(struct wl1251 *wl)
  57 {
  58         unsigned long delay;
  59
  60         if (wl->station_mode != STATION_ACTIVE_MODE) {
  61                 delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
  62                 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
  63         }
  64 }
  65
  66 int wl1251_ps_elp_wakeup(struct wl1251 *wl)
  67 {
  68         unsigned long timeout, start;
  69         u32 elp_reg;
  70
  71         if (delayed_work_pending(&wl->elp_work))
  72                 cancel_delayed_work(&wl->elp_work);
  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 int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_station_mode mode)
 108 {
 109         int ret;
 110
 111         switch (mode) {
 112         case STATION_POWER_SAVE_MODE:
 113                 wl1251_debug(DEBUG_PSM, "entering psm");
 114
 115                 ret = wl1251_acx_wake_up_conditions(wl,
 116                                                     WAKE_UP_EVENT_DTIM_BITMAP,
 117                                                     wl->listen_int);
 118                 if (ret < 0)
 119                         return ret;
 120
 121 #if 0 /* problems seen on one router */
 122                 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE,
 123                                             WL1251_DEFAULT_BET_CONSECUTIVE);
 124                 if (ret < 0)
 125                         return ret;
 126 #endif
 127
 128                 ret = wl1251_cmd_ps_mode(wl, CHIP_POWER_SAVE_MODE);
 129                 if (ret < 0)
 130                         return ret;
 131
 132                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
 133                 if (ret < 0)
 134                         return ret;
 135                 break;
 136         case STATION_IDLE:
 137                 wl1251_debug(DEBUG_PSM, "entering idle");
 138
 139                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
 140                 if (ret < 0)
 141                         return ret;
 142
 143                 ret = wl1251_cmd_template_set(wl, CMD_DISCONNECT, NULL, 0);
 144                 if (ret < 0)
 145                         return ret;
 146                 break;
 147         case STATION_ACTIVE_MODE:
 148         default:
 149                 wl1251_debug(DEBUG_PSM, "leaving psm");
 150
 151                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
 152                 if (ret < 0)
 153                         return ret;
 154
 155 #if 0
 156                 /* disable BET */
 157                 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE,
 158                                             WL1251_DEFAULT_BET_CONSECUTIVE);
 159                 if (ret < 0)
 160                         return ret;
 161 #endif
 162
 163                 /* disable beacon filtering */
 164                 ret = wl1251_acx_beacon_filter_opt(wl, false);
 165                 if (ret < 0)
 166                         return ret;
 167
 168                 ret = wl1251_acx_wake_up_conditions(wl,
 169                                                     WAKE_UP_EVENT_DTIM_BITMAP,
 170                                                     wl->listen_int);
 171                 if (ret < 0)
 172                         return ret;
 173
 174                 ret = wl1251_cmd_ps_mode(wl, CHIP_ACTIVE_MODE);
 175                 if (ret < 0)
 176                         return ret;
 177
 178                 break;
 179         }
 180         wl->station_mode = mode;
 181         wl->ps_transitioning = true;
 182         wl->ps_change_jiffies = jiffies;
 183
 184         return ret;
 185 }
 186