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 /* enable beacon filtering */ 116 ret = wl1251_acx_beacon_filter_opt(wl, true); 117 if (ret < 0) 118 return ret; 119 120 ret = wl1251_acx_wake_up_conditions(wl, 121 WAKE_UP_EVENT_DTIM_BITMAP, 122 wl->listen_int); 123 if (ret < 0) 124 return ret; 125 126 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE, 127 WL1251_DEFAULT_BET_CONSECUTIVE); 128 if (ret < 0) 129 return ret; 130 131 ret = wl1251_cmd_ps_mode(wl, CHIP_POWER_SAVE_MODE); 132 if (ret < 0) 133 return ret; 134 135 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP); 136 if (ret < 0) 137 return ret; 138 break; 139 case STATION_IDLE: 140 wl1251_debug(DEBUG_PSM, "entering idle"); 141 142 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP); 143 if (ret < 0) 144 return ret; 145 146 ret = wl1251_cmd_template_set(wl, CMD_DISCONNECT, NULL, 0); 147 if (ret < 0) 148 return ret; 149 break; 150 case STATION_ACTIVE_MODE: 151 default: 152 wl1251_debug(DEBUG_PSM, "leaving psm"); 153 154 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM); 155 if (ret < 0) 156 return ret; 157 158 /* disable BET */ 159 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE, 160 WL1251_DEFAULT_BET_CONSECUTIVE); 161 if (ret < 0) 162 return ret; 163 164 /* disable beacon filtering */ 165 ret = wl1251_acx_beacon_filter_opt(wl, false); 166 if (ret < 0) 167 return ret; 168 169 ret = wl1251_acx_wake_up_conditions(wl, 170 WAKE_UP_EVENT_DTIM_BITMAP, 171 wl->listen_int); 172 if (ret < 0) 173 return ret; 174 175 ret = wl1251_cmd_ps_mode(wl, CHIP_ACTIVE_MODE); 176 if (ret < 0) 177 return ret; 178 179 break; 180 } 181 wl->station_mode = mode; 182 183 return ret; 184 } 185 186