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 #define WL1251_WAKEUP_TIMEOUT 2000
  30
  31 void wl1251_elp_work(struct work_struct *work)
  32 {
  33         struct delayed_work *dwork;
  34         struct wl1251 *wl;
  35
  36         dwork = container_of(work, struct delayed_work, work);
  37         wl = container_of(dwork, struct wl1251, elp_work);
  38
  39         wl1251_debug(DEBUG_PSM, "elp work");
  40
  41         mutex_lock(&wl->mutex);
  42
  43         if (wl->elp || !wl->psm)
  44                 goto out;
  45
  46         wl1251_debug(DEBUG_PSM, "chip to elp");
  47         wl1251_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
  48         wl->elp = true;
  49
  50 out:
  51         mutex_unlock(&wl->mutex);
  52 }
  53
  54 #define ELP_ENTRY_DELAY  5
  55
  56 /* Routines to toggle sleep mode while in ELP */
  57 void wl1251_ps_elp_sleep(struct wl1251 *wl)
  58 {
  59         unsigned long delay;
  60
  61         if (wl->psm) {
  62                 cancel_delayed_work(&wl->elp_work);
  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;
  71         u32 elp_reg;
  72
  73         if (!wl->elp)
  74                 return 0;
  75
  76         wl1251_debug(DEBUG_PSM, "waking up chip from elp");
  77
  78         timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
  79
  80         wl1251_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
  81
  82         elp_reg = wl1251_read32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
  83
  84         /*
  85          * FIXME: we should wait for irq from chip but, as a temporary
  86          * solution to simplify locking, let's poll instead
  87          */
  88         while (!(elp_reg & ELPCTRL_WLAN_READY)) {
  89                 if (time_after(jiffies, timeout)) {
  90                         wl1251_error("elp wakeup timeout");
  91                         return -ETIMEDOUT;
  92                 }
  93                 msleep(1);
  94                 elp_reg = wl1251_read32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
  95         }
  96
  97         wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
  98                      jiffies_to_msecs(jiffies) -
  99                      (jiffies_to_msecs(timeout) - WL1251_WAKEUP_TIMEOUT));
 100
 101         wl->elp = false;
 102
 103         return 0;
 104 }
 105
 106 static int wl1251_ps_set_elp(struct wl1251 *wl, bool enable)
 107 {
 108         int ret;
 109
 110         if (enable) {
 111                 wl1251_debug(DEBUG_PSM, "sleep auth psm/elp");
 112
 113                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
 114                 if (ret < 0)
 115                         return ret;
 116
 117                 wl1251_ps_elp_sleep(wl);
 118         } else {
 119                 wl1251_debug(DEBUG_PSM, "sleep auth cam");
 120
 121                 /*
 122                  * When the target is in ELP, we can only
 123                  * access the ELP control register. Thus,
 124                  * we have to wake the target up before
 125                  * changing the power authorization.
 126                  */
 127
 128                 wl1251_ps_elp_wakeup(wl);
 129
 130                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
 131                 if (ret < 0)
 132                         return ret;
 133         }
 134
 135         return 0;
 136 }
 137
 138 int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_cmd_ps_mode mode)
 139 {
 140         int ret;
 141
 142         switch (mode) {
 143         case STATION_POWER_SAVE_MODE:
 144                 wl1251_debug(DEBUG_PSM, "entering psm");
 145
 146                 /* enable beacon filtering */
 147                 ret = wl1251_acx_beacon_filter_opt(wl, true);
 148                 if (ret < 0)
 149                         return ret;
 150
 151                 ret = wl1251_acx_wake_up_conditions(wl,
 152                                                     WAKE_UP_EVENT_DTIM_BITMAP,
 153                                                     wl->listen_int);
 154                 if (ret < 0)
 155                         return ret;
 156
 157                 ret = wl1251_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
 158                 if (ret < 0)
 159                         return ret;
 160
 161                 ret = wl1251_ps_set_elp(wl, true);
 162                 if (ret < 0)
 163                         return ret;
 164
 165                 wl->psm = 1;
 166                 break;
 167         case STATION_ACTIVE_MODE:
 168         default:
 169                 wl1251_debug(DEBUG_PSM, "leaving psm");
 170                 ret = wl1251_ps_set_elp(wl, false);
 171                 if (ret < 0)
 172                         return ret;
 173
 174                 /* disable beacon filtering */
 175                 ret = wl1251_acx_beacon_filter_opt(wl, false);
 176                 if (ret < 0)
 177                         return ret;
 178
 179                 ret = wl1251_acx_wake_up_conditions(wl,
 180                                                     WAKE_UP_EVENT_DTIM_BITMAP,
 181                                                     wl->listen_int);
 182                 if (ret < 0)
 183                         return ret;
 184
 185                 ret = wl1251_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
 186                 if (ret < 0)
 187                         return ret;
 188
 189                 wl->psm = 0;
 190                 break;
 191         }
 192
 193         return ret;
 194 }
 195