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->station_mode == STATION_ACTIVE_MODE)
  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->station_mode != STATION_ACTIVE_MODE) {
  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         DECLARE_COMPLETION_ONSTACK(compl);
  71         unsigned long start;
  72         u32 elp_reg;
  73         int ret;
  74
  75         if (delayed_work_pending(&wl->elp_work))
  76                 cancel_delayed_work(&wl->elp_work);
  77
  78         if (!wl->elp)
  79                 return 0;
  80
  81         wl1251_debug(DEBUG_PSM, "waking up chip from elp");
  82
  83         start = jiffies;
  84
  85         elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
  86
  87         wl->elp_compl = &compl;
  88         wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR,
  89                          ELPCTRL_WAKE_UP | ELPCTRL_IRQ_SRC);
  90
  91         elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
  92         if (!(elp_reg & ELPCTRL_WLAN_READY)) {
  93                 ret = wait_for_completion_timeout(
  94                         &compl, msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT));
  95                 if (ret == 0) {
  96                         wl1251_error("ELP wakeup timeout");
  97                         ret = -ETIMEDOUT;
  98                         goto err;
  99                 } else if (ret < 0) {
 100                         wl1251_error("ELP wakeup completion error.");
 101                         goto err;
 102                 }
 103         }
 104
 105         wl->elp_compl = NULL;
 106
 107         /* clear IRQ_SRC to switch irq source back from WLAN_RDY to HOST_IRQ */
 108         wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
 109
 110         wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
 111                      jiffies_to_msecs(jiffies - start));
 112
 113         wl->elp = false;
 114
 115         return 0;
 116
 117 err:
 118         wl->elp_compl = NULL;
 119         return ret;
 120 }
 121
 122 int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_station_mode mode)
 123 {
 124         int ret;
 125
 126         switch (mode) {
 127         case STATION_POWER_SAVE_MODE:
 128                 wl1251_debug(DEBUG_PSM, "entering psm");
 129
 130                 /* enable beacon filtering */
 131                 ret = wl1251_acx_beacon_filter_opt(wl, true);
 132                 if (ret < 0)
 133                         return ret;
 134
 135                 ret = wl1251_acx_wake_up_conditions(wl,
 136                                                     WAKE_UP_EVENT_DTIM_BITMAP,
 137                                                     wl->listen_int);
 138                 if (ret < 0)
 139                         return ret;
 140
 141                 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE,
 142                                             WL1251_DEFAULT_BET_CONSECUTIVE);
 143                 if (ret < 0)
 144                         return ret;
 145
 146                 ret = wl1251_cmd_ps_mode(wl, CHIP_POWER_SAVE_MODE);
 147                 if (ret < 0)
 148                         return ret;
 149
 150                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
 151                 if (ret < 0)
 152                         return ret;
 153                 break;
 154         case STATION_ACTIVE_MODE:
 155         default:
 156                 wl1251_debug(DEBUG_PSM, "leaving psm");
 157
 158                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
 159                 if (ret < 0)
 160                         return ret;
 161
 162                 /* disable BET */
 163                 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE,
 164                                             WL1251_DEFAULT_BET_CONSECUTIVE);
 165                 if (ret < 0)
 166                         return ret;
 167
 168                 /* disable beacon filtering */
 169                 ret = wl1251_acx_beacon_filter_opt(wl, false);
 170                 if (ret < 0)
 171                         return ret;
 172
 173                 ret = wl1251_acx_wake_up_conditions(wl,
 174                                                     WAKE_UP_EVENT_DTIM_BITMAP,
 175                                                     wl->listen_int);
 176                 if (ret < 0)
 177                         return ret;
 178
 179                 ret = wl1251_cmd_ps_mode(wl, CHIP_ACTIVE_MODE);
 180                 if (ret < 0)
 181                         return ret;
 182
 183                 break;
 184         }
 185         wl->station_mode = mode;
 186
 187         return ret;
 188 }
 189