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 #define ELP_ENTRY_DELAY 30 32 #define ELP_ENTRY_DELAY_FORCE_PS 5 33 34 void wl1271_elp_work(struct work_struct *work) 35 { 36 struct delayed_work *dwork; 37 struct wl1271 *wl; 38 struct wl12xx_vif *wlvif; 39 int ret; 40 41 dwork = to_delayed_work(work); 42 wl = container_of(dwork, struct wl1271, elp_work); 43 44 wl1271_debug(DEBUG_PSM, "elp work"); 45 46 mutex_lock(&wl->mutex); 47 48 if (unlikely(wl->state != WLCORE_STATE_ON)) 49 goto out; 50 51 /* our work might have been already cancelled */ 52 if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))) 53 goto out; 54 55 if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags)) 56 goto out; 57 58 wl12xx_for_each_wlvif(wl, wlvif) { 59 if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) && 60 test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags)) 61 goto out; 62 } 63 64 wl1271_debug(DEBUG_PSM, "chip to elp"); 65 ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_SLEEP); 66 if (ret < 0) { 67 wl12xx_queue_recovery_work(wl); 68 goto out; 69 } 70 71 set_bit(WL1271_FLAG_IN_ELP, &wl->flags); 72 73 out: 74 mutex_unlock(&wl->mutex); 75 } 76 77 /* Routines to toggle sleep mode while in ELP */ 78 void wl1271_ps_elp_sleep(struct wl1271 *wl) 79 { 80 struct wl12xx_vif *wlvif; 81 u32 timeout; 82 83 /* We do not enter elp sleep in PLT mode */ 84 if (wl->plt) 85 return; 86 87 if (wl->sleep_auth != WL1271_PSM_ELP) 88 return; 89 90 /* we shouldn't get consecutive sleep requests */ 91 if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))) 92 return; 93 94 wl12xx_for_each_wlvif(wl, wlvif) { 95 if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) && 96 test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags)) 97 return; 98 } 99 100 timeout = wl->conf.conn.forced_ps ? 101 ELP_ENTRY_DELAY_FORCE_PS : ELP_ENTRY_DELAY; 102 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, 103 msecs_to_jiffies(timeout)); 104 } 105 EXPORT_SYMBOL_GPL(wl1271_ps_elp_sleep); 106 107 int wl1271_ps_elp_wakeup(struct wl1271 *wl) 108 { 109 DECLARE_COMPLETION_ONSTACK(compl); 110 unsigned long flags; 111 int ret; 112 unsigned long start_time = jiffies; 113 bool pending = false; 114 115 /* 116 * we might try to wake up even if we didn't go to sleep 117 * before (e.g. on boot) 118 */ 119 if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)) 120 return 0; 121 122 /* don't cancel_sync as it might contend for a mutex and deadlock */ 123 cancel_delayed_work(&wl->elp_work); 124 125 if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags)) 126 return 0; 127 128 wl1271_debug(DEBUG_PSM, "waking up chip from elp"); 129 130 /* 131 * The spinlock is required here to synchronize both the work and 132 * the completion variable in one entity. 133 */ 134 spin_lock_irqsave(&wl->wl_lock, flags); 135 if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags)) 136 pending = true; 137 else 138 wl->elp_compl = &compl; 139 spin_unlock_irqrestore(&wl->wl_lock, flags); 140 141 ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_WAKE_UP); 142 if (ret < 0) { 143 wl12xx_queue_recovery_work(wl); 144 goto err; 145 } 146 147 if (!pending) { 148 ret = wait_for_completion_timeout( 149 &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT)); 150 if (ret == 0) { 151 wl1271_error("ELP wakeup timeout!"); 152 wl12xx_queue_recovery_work(wl); 153 ret = -ETIMEDOUT; 154 goto err; 155 } 156 } 157 158 clear_bit(WL1271_FLAG_IN_ELP, &wl->flags); 159 160 wl1271_debug(DEBUG_PSM, "wakeup time: %u ms", 161 jiffies_to_msecs(jiffies - start_time)); 162 goto out; 163 164 err: 165 spin_lock_irqsave(&wl->wl_lock, flags); 166 wl->elp_compl = NULL; 167 spin_unlock_irqrestore(&wl->wl_lock, flags); 168 return ret; 169 170 out: 171 return 0; 172 } 173 EXPORT_SYMBOL_GPL(wl1271_ps_elp_wakeup); 174 175 int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif, 176 enum wl1271_cmd_ps_mode mode) 177 { 178 int ret; 179 u16 timeout = wl->conf.conn.dynamic_ps_timeout; 180 181 switch (mode) { 182 case STATION_AUTO_PS_MODE: 183 case STATION_POWER_SAVE_MODE: 184 wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)", 185 mode, timeout); 186 187 ret = wl1271_acx_wake_up_conditions(wl, wlvif, 188 wl->conf.conn.wake_up_event, 189 wl->conf.conn.listen_interval); 190 if (ret < 0) { 191 wl1271_error("couldn't set wake up conditions"); 192 return ret; 193 } 194 195 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout); 196 if (ret < 0) 197 return ret; 198 199 set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags); 200 201 /* 202 * enable beacon early termination. 203 * Not relevant for 5GHz and for high rates. 204 */ 205 if ((wlvif->band == NL80211_BAND_2GHZ) && 206 (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) { 207 ret = wl1271_acx_bet_enable(wl, wlvif, true); 208 if (ret < 0) 209 return ret; 210 } 211 break; 212 case STATION_ACTIVE_MODE: 213 wl1271_debug(DEBUG_PSM, "leaving psm"); 214 215 /* disable beacon early termination */ 216 if ((wlvif->band == NL80211_BAND_2GHZ) && 217 (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) { 218 ret = wl1271_acx_bet_enable(wl, wlvif, false); 219 if (ret < 0) 220 return ret; 221 } 222 223 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0); 224 if (ret < 0) 225 return ret; 226 227 clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags); 228 break; 229 default: 230 wl1271_warning("trying to set ps to unsupported mode %d", mode); 231 ret = -EINVAL; 232 } 233 234 return ret; 235 } 236 237 static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid) 238 { 239 int i; 240 struct sk_buff *skb; 241 struct ieee80211_tx_info *info; 242 unsigned long flags; 243 int filtered[NUM_TX_QUEUES]; 244 struct wl1271_link *lnk = &wl->links[hlid]; 245 246 /* filter all frames currently in the low level queues for this hlid */ 247 for (i = 0; i < NUM_TX_QUEUES; i++) { 248 filtered[i] = 0; 249 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) { 250 filtered[i]++; 251 252 if (WARN_ON(wl12xx_is_dummy_packet(wl, skb))) 253 continue; 254 255 info = IEEE80211_SKB_CB(skb); 256 info->flags |= IEEE80211_TX_STAT_TX_FILTERED; 257 info->status.rates[0].idx = -1; 258 ieee80211_tx_status_ni(wl->hw, skb); 259 } 260 } 261 262 spin_lock_irqsave(&wl->wl_lock, flags); 263 for (i = 0; i < NUM_TX_QUEUES; i++) { 264 wl->tx_queue_count[i] -= filtered[i]; 265 if (lnk->wlvif) 266 lnk->wlvif->tx_queue_count[i] -= filtered[i]; 267 } 268 spin_unlock_irqrestore(&wl->wl_lock, flags); 269 270 wl1271_handle_tx_low_watermark(wl); 271 } 272 273 void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif, 274 u8 hlid, bool clean_queues) 275 { 276 struct ieee80211_sta *sta; 277 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); 278 279 if (WARN_ON_ONCE(wlvif->bss_type != BSS_TYPE_AP_BSS)) 280 return; 281 282 if (!test_bit(hlid, wlvif->ap.sta_hlid_map) || 283 test_bit(hlid, &wl->ap_ps_map)) 284 return; 285 286 wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d " 287 "clean_queues %d", hlid, wl->links[hlid].allocated_pkts, 288 clean_queues); 289 290 rcu_read_lock(); 291 sta = ieee80211_find_sta(vif, wl->links[hlid].addr); 292 if (!sta) { 293 wl1271_error("could not find sta %pM for starting ps", 294 wl->links[hlid].addr); 295 rcu_read_unlock(); 296 return; 297 } 298 299 ieee80211_sta_ps_transition_ni(sta, true); 300 rcu_read_unlock(); 301 302 /* do we want to filter all frames from this link's queues? */ 303 if (clean_queues) 304 wl1271_ps_filter_frames(wl, hlid); 305 306 __set_bit(hlid, &wl->ap_ps_map); 307 } 308 309 void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid) 310 { 311 struct ieee80211_sta *sta; 312 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); 313 314 if (!test_bit(hlid, &wl->ap_ps_map)) 315 return; 316 317 wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid); 318 319 __clear_bit(hlid, &wl->ap_ps_map); 320 321 rcu_read_lock(); 322 sta = ieee80211_find_sta(vif, wl->links[hlid].addr); 323 if (!sta) { 324 wl1271_error("could not find sta %pM for ending ps", 325 wl->links[hlid].addr); 326 goto end; 327 } 328 329 ieee80211_sta_ps_transition_ni(sta, false); 330 end: 331 rcu_read_unlock(); 332 } 333