kernel/drivers/net/wireless/ti/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         cancel_delayed_work(&wl->elp_work);
  72
  73         if (!wl->elp)
  74                 return 0;
  75
  76         wl1251_debug(DEBUG_PSM, "waking up chip from elp");
  77
  78         start = jiffies;
  79         timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
  80
  81         wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
  82
  83         elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
  84
  85         /*
  86          * FIXME: we should wait for irq from chip but, as a temporary
  87          * solution to simplify locking, let's poll instead
  88          */
  89         while (!(elp_reg & ELPCTRL_WLAN_READY)) {
  90                 if (time_after(jiffies, timeout)) {
  91                         wl1251_error("elp wakeup timeout");
  92                         return -ETIMEDOUT;
  93                 }
  94                 msleep(1);
  95                 elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
  96         }
  97
  98         wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
  99                      jiffies_to_msecs(jiffies - start));
 100
 101         wl->elp = false;
 102
 103         return 0;
 104 }
 105
 106 int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_station_mode mode)
 107 {
 108         int ret;
 109
 110         switch (mode) {
 111         case STATION_POWER_SAVE_MODE:
 112                 wl1251_debug(DEBUG_PSM, "entering psm");
 113
 114                 /* enable beacon filtering */
 115                 ret = wl1251_acx_beacon_filter_opt(wl, true);
 116                 if (ret < 0)
 117                         return ret;
 118
 119                 ret = wl1251_acx_wake_up_conditions(wl,
 120                                                     WAKE_UP_EVENT_DTIM_BITMAP,
 121                                                     wl->listen_int);
 122                 if (ret < 0)
 123                         return ret;
 124
 125                 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE,
 126                                             WL1251_DEFAULT_BET_CONSECUTIVE);
 127                 if (ret < 0)
 128                         return ret;
 129
 130                 ret = wl1251_cmd_ps_mode(wl, CHIP_POWER_SAVE_MODE);
 131                 if (ret < 0)
 132                         return ret;
 133
 134                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
 135                 if (ret < 0)
 136                         return ret;
 137                 break;
 138         case STATION_IDLE:
 139                 wl1251_debug(DEBUG_PSM, "entering idle");
 140
 141                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
 142                 if (ret < 0)
 143                         return ret;
 144
 145                 ret = wl1251_cmd_template_set(wl, CMD_DISCONNECT, NULL, 0);
 146                 if (ret < 0)
 147                         return ret;
 148                 break;
 149         case STATION_ACTIVE_MODE:
 150         default:
 151                 wl1251_debug(DEBUG_PSM, "leaving psm");
 152
 153                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
 154                 if (ret < 0)
 155                         return ret;
 156
 157                 /* disable BET */
 158                 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE,
 159                                             WL1251_DEFAULT_BET_CONSECUTIVE);
 160                 if (ret < 0)
 161                         return ret;
 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
 182         return ret;
 183 }
 184