1 /* 2 * This file is part of wl1271 3 * 4 * Copyright (C) 2008-2009 Nokia Corporation 5 * 6 * Contact: Luciano Coelho <luciano.coelho@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 "ps.h" 25 #include "io.h" 26 #include "tx.h" 27 #include "debug.h" 28 29 #define WL1271_WAKEUP_TIMEOUT 500 30 31 void wl1271_elp_work(struct work_struct *work) 32 { 33 struct delayed_work *dwork; 34 struct wl1271 *wl; 35 struct wl12xx_vif *wlvif; 36 37 dwork = container_of(work, struct delayed_work, work); 38 wl = container_of(dwork, struct wl1271, elp_work); 39 40 wl1271_debug(DEBUG_PSM, "elp work"); 41 42 mutex_lock(&wl->mutex); 43 44 if (unlikely(wl->state == WL1271_STATE_OFF)) 45 goto out; 46 47 /* our work might have been already cancelled */ 48 if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))) 49 goto out; 50 51 if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags)) 52 goto out; 53 54 wl12xx_for_each_wlvif(wl, wlvif) { 55 if (wlvif->bss_type == BSS_TYPE_AP_BSS) 56 goto out; 57 58 if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) && 59 test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags)) 60 goto out; 61 } 62 63 wl1271_debug(DEBUG_PSM, "chip to elp"); 64 wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_SLEEP); 65 set_bit(WL1271_FLAG_IN_ELP, &wl->flags); 66 67 out: 68 mutex_unlock(&wl->mutex); 69 } 70 71 /* Routines to toggle sleep mode while in ELP */ 72 void wl1271_ps_elp_sleep(struct wl1271 *wl) 73 { 74 struct wl12xx_vif *wlvif; 75 76 if (wl->quirks & WLCORE_QUIRK_NO_ELP) 77 return; 78 79 /* we shouldn't get consecutive sleep requests */ 80 if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))) 81 return; 82 83 wl12xx_for_each_wlvif(wl, wlvif) { 84 if (wlvif->bss_type == BSS_TYPE_AP_BSS) 85 return; 86 87 if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) && 88 test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags)) 89 return; 90 } 91 92 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, 93 msecs_to_jiffies(wl->conf.conn.dynamic_ps_timeout)); 94 } 95 96 int wl1271_ps_elp_wakeup(struct wl1271 *wl) 97 { 98 DECLARE_COMPLETION_ONSTACK(compl); 99 unsigned long flags; 100 int ret; 101 u32 start_time = jiffies; 102 bool pending = false; 103 104 /* 105 * we might try to wake up even if we didn't go to sleep 106 * before (e.g. on boot) 107 */ 108 if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)) 109 return 0; 110 111 /* don't cancel_sync as it might contend for a mutex and deadlock */ 112 cancel_delayed_work(&wl->elp_work); 113 114 if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags)) 115 return 0; 116 117 wl1271_debug(DEBUG_PSM, "waking up chip from elp"); 118 119 /* 120 * The spinlock is required here to synchronize both the work and 121 * the completion variable in one entity. 122 */ 123 spin_lock_irqsave(&wl->wl_lock, flags); 124 if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags)) 125 pending = true; 126 else 127 wl->elp_compl = &compl; 128 spin_unlock_irqrestore(&wl->wl_lock, flags); 129 130 wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_WAKE_UP); 131 132 if (!pending) { 133 ret = wait_for_completion_timeout( 134 &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT)); 135 if (ret == 0) { 136 wl1271_error("ELP wakeup timeout!"); 137 wl12xx_queue_recovery_work(wl); 138 ret = -ETIMEDOUT; 139 goto err; 140 } else if (ret < 0) { 141 wl1271_error("ELP wakeup completion error."); 142 goto err; 143 } 144 } 145 146 clear_bit(WL1271_FLAG_IN_ELP, &wl->flags); 147 148 wl1271_debug(DEBUG_PSM, "wakeup time: %u ms", 149 jiffies_to_msecs(jiffies - start_time)); 150 goto out; 151 152 err: 153 spin_lock_irqsave(&wl->wl_lock, flags); 154 wl->elp_compl = NULL; 155 spin_unlock_irqrestore(&wl->wl_lock, flags); 156 return ret; 157 158 out: 159 return 0; 160 } 161 162 int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif, 163 enum wl1271_cmd_ps_mode mode) 164 { 165 int ret; 166 u16 timeout = wl->conf.conn.dynamic_ps_timeout; 167 168 switch (mode) { 169 case STATION_AUTO_PS_MODE: 170 case STATION_POWER_SAVE_MODE: 171 wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)", 172 mode, timeout); 173 174 ret = wl1271_acx_wake_up_conditions(wl, wlvif, 175 wl->conf.conn.wake_up_event, 176 wl->conf.conn.listen_interval); 177 if (ret < 0) { 178 wl1271_error("couldn't set wake up conditions"); 179 return ret; 180 } 181 182 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout); 183 if (ret < 0) 184 return ret; 185 186 set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags); 187 188 /* enable beacon early termination. Not relevant for 5GHz */ 189 if (wlvif->band == IEEE80211_BAND_2GHZ) { 190 ret = wl1271_acx_bet_enable(wl, wlvif, true); 191 if (ret < 0) 192 return ret; 193 } 194 break; 195 case STATION_ACTIVE_MODE: 196 wl1271_debug(DEBUG_PSM, "leaving psm"); 197 198 /* disable beacon early termination */ 199 if (wlvif->band == IEEE80211_BAND_2GHZ) { 200 ret = wl1271_acx_bet_enable(wl, wlvif, false); 201 if (ret < 0) 202 return ret; 203 } 204 205 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0); 206 if (ret < 0) 207 return ret; 208 209 clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags); 210 break; 211 default: 212 wl1271_warning("trying to set ps to unsupported mode %d", mode); 213 ret = -EINVAL; 214 } 215 216 return ret; 217 } 218 219 static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid) 220 { 221 int i; 222 struct sk_buff *skb; 223 struct ieee80211_tx_info *info; 224 unsigned long flags; 225 int filtered[NUM_TX_QUEUES]; 226 227 /* filter all frames currently in the low level queues for this hlid */ 228 for (i = 0; i < NUM_TX_QUEUES; i++) { 229 filtered[i] = 0; 230 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) { 231 filtered[i]++; 232 233 if (WARN_ON(wl12xx_is_dummy_packet(wl, skb))) 234 continue; 235 236 info = IEEE80211_SKB_CB(skb); 237 info->flags |= IEEE80211_TX_STAT_TX_FILTERED; 238 info->status.rates[0].idx = -1; 239 ieee80211_tx_status_ni(wl->hw, skb); 240 } 241 } 242 243 spin_lock_irqsave(&wl->wl_lock, flags); 244 for (i = 0; i < NUM_TX_QUEUES; i++) 245 wl->tx_queue_count[i] -= filtered[i]; 246 spin_unlock_irqrestore(&wl->wl_lock, flags); 247 248 wl1271_handle_tx_low_watermark(wl); 249 } 250 251 void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif, 252 u8 hlid, bool clean_queues) 253 { 254 struct ieee80211_sta *sta; 255 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); 256 257 if (test_bit(hlid, &wl->ap_ps_map)) 258 return; 259 260 wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d " 261 "clean_queues %d", hlid, wl->links[hlid].allocated_pkts, 262 clean_queues); 263 264 rcu_read_lock(); 265 sta = ieee80211_find_sta(vif, wl->links[hlid].addr); 266 if (!sta) { 267 wl1271_error("could not find sta %pM for starting ps", 268 wl->links[hlid].addr); 269 rcu_read_unlock(); 270 return; 271 } 272 273 ieee80211_sta_ps_transition_ni(sta, true); 274 rcu_read_unlock(); 275 276 /* do we want to filter all frames from this link's queues? */ 277 if (clean_queues) 278 wl1271_ps_filter_frames(wl, hlid); 279 280 __set_bit(hlid, &wl->ap_ps_map); 281 } 282 283 void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid) 284 { 285 struct ieee80211_sta *sta; 286 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); 287 288 if (!test_bit(hlid, &wl->ap_ps_map)) 289 return; 290 291 wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid); 292 293 __clear_bit(hlid, &wl->ap_ps_map); 294 295 rcu_read_lock(); 296 sta = ieee80211_find_sta(vif, wl->links[hlid].addr); 297 if (!sta) { 298 wl1271_error("could not find sta %pM for ending ps", 299 wl->links[hlid].addr); 300 goto end; 301 } 302 303 ieee80211_sta_ps_transition_ni(sta, false); 304 end: 305 rcu_read_unlock(); 306 } 307