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 33 void wl1271_elp_work(struct work_struct *work) 34 { 35 struct delayed_work *dwork; 36 struct wl1271 *wl; 37 struct wl12xx_vif *wlvif; 38 int ret; 39 40 dwork = container_of(work, struct delayed_work, work); 41 wl = container_of(dwork, struct wl1271, elp_work); 42 43 wl1271_debug(DEBUG_PSM, "elp work"); 44 45 mutex_lock(&wl->mutex); 46 47 if (unlikely(wl->state != WLCORE_STATE_ON)) 48 goto out; 49 50 /* our work might have been already cancelled */ 51 if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))) 52 goto out; 53 54 if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags)) 55 goto out; 56 57 wl12xx_for_each_wlvif(wl, wlvif) { 58 if (wlvif->bss_type == BSS_TYPE_AP_BSS) 59 goto out; 60 61 if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) && 62 test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags)) 63 goto out; 64 } 65 66 wl1271_debug(DEBUG_PSM, "chip to elp"); 67 ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_SLEEP); 68 if (ret < 0) { 69 wl12xx_queue_recovery_work(wl); 70 goto out; 71 } 72 73 set_bit(WL1271_FLAG_IN_ELP, &wl->flags); 74 75 out: 76 mutex_unlock(&wl->mutex); 77 } 78 79 /* Routines to toggle sleep mode while in ELP */ 80 void wl1271_ps_elp_sleep(struct wl1271 *wl) 81 { 82 struct wl12xx_vif *wlvif; 83 u32 timeout; 84 85 if (wl->sleep_auth != WL1271_PSM_ELP) 86 return; 87 88 /* we shouldn't get consecutive sleep requests */ 89 if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))) 90 return; 91 92 wl12xx_for_each_wlvif(wl, wlvif) { 93 if (wlvif->bss_type == BSS_TYPE_AP_BSS) 94 return; 95 96 if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) && 97 test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags)) 98 return; 99 } 100 101 timeout = ELP_ENTRY_DELAY; 102 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, 103 msecs_to_jiffies(timeout)); 104 } 105 106 int wl1271_ps_elp_wakeup(struct wl1271 *wl) 107 { 108 DECLARE_COMPLETION_ONSTACK(compl); 109 unsigned long flags; 110 int ret; 111 u32 start_time = jiffies; 112 bool pending = false; 113 114 /* 115 * we might try to wake up even if we didn't go to sleep 116 * before (e.g. on boot) 117 */ 118 if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)) 119 return 0; 120 121 /* don't cancel_sync as it might contend for a mutex and deadlock */ 122 cancel_delayed_work(&wl->elp_work); 123 124 if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags)) 125 return 0; 126 127 wl1271_debug(DEBUG_PSM, "waking up chip from elp"); 128 129 /* 130 * The spinlock is required here to synchronize both the work and 131 * the completion variable in one entity. 132 */ 133 spin_lock_irqsave(&wl->wl_lock, flags); 134 if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags)) 135 pending = true; 136 else 137 wl->elp_compl = &compl; 138 spin_unlock_irqrestore(&wl->wl_lock, flags); 139 140 ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_WAKE_UP); 141 if (ret < 0) { 142 wl12xx_queue_recovery_work(wl); 143 goto err; 144 } 145 146 if (!pending) { 147 ret = wait_for_completion_timeout( 148 &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT)); 149 if (ret == 0) { 150 wl1271_error("ELP wakeup timeout!"); 151 wl12xx_queue_recovery_work(wl); 152 ret = -ETIMEDOUT; 153 goto err; 154 } else if (ret < 0) { 155 wl1271_error("ELP wakeup completion error."); 156 goto err; 157 } 158 } 159 160 clear_bit(WL1271_FLAG_IN_ELP, &wl->flags); 161 162 wl1271_debug(DEBUG_PSM, "wakeup time: %u ms", 163 jiffies_to_msecs(jiffies - start_time)); 164 goto out; 165 166 err: 167 spin_lock_irqsave(&wl->wl_lock, flags); 168 wl->elp_compl = NULL; 169 spin_unlock_irqrestore(&wl->wl_lock, flags); 170 return ret; 171 172 out: 173 return 0; 174 } 175 176 int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif, 177 enum wl1271_cmd_ps_mode mode) 178 { 179 int ret; 180 u16 timeout = wl->conf.conn.dynamic_ps_timeout; 181 182 switch (mode) { 183 case STATION_AUTO_PS_MODE: 184 case STATION_POWER_SAVE_MODE: 185 wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)", 186 mode, timeout); 187 188 ret = wl1271_acx_wake_up_conditions(wl, wlvif, 189 wl->conf.conn.wake_up_event, 190 wl->conf.conn.listen_interval); 191 if (ret < 0) { 192 wl1271_error("couldn't set wake up conditions"); 193 return ret; 194 } 195 196 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout); 197 if (ret < 0) 198 return ret; 199 200 set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags); 201 202 /* 203 * enable beacon early termination. 204 * Not relevant for 5GHz and for high rates. 205 */ 206 if ((wlvif->band == IEEE80211_BAND_2GHZ) && 207 (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) { 208 ret = wl1271_acx_bet_enable(wl, wlvif, true); 209 if (ret < 0) 210 return ret; 211 } 212 break; 213 case STATION_ACTIVE_MODE: 214 wl1271_debug(DEBUG_PSM, "leaving psm"); 215 216 /* disable beacon early termination */ 217 if ((wlvif->band == IEEE80211_BAND_2GHZ) && 218 (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) { 219 ret = wl1271_acx_bet_enable(wl, wlvif, false); 220 if (ret < 0) 221 return ret; 222 } 223 224 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0); 225 if (ret < 0) 226 return ret; 227 228 clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags); 229 break; 230 default: 231 wl1271_warning("trying to set ps to unsupported mode %d", mode); 232 ret = -EINVAL; 233 } 234 235 return ret; 236 } 237 238 static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid) 239 { 240 int i; 241 struct sk_buff *skb; 242 struct ieee80211_tx_info *info; 243 unsigned long flags; 244 int filtered[NUM_TX_QUEUES]; 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(&wl->links[hlid].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 spin_unlock_irqrestore(&wl->wl_lock, flags); 266 267 wl1271_handle_tx_low_watermark(wl); 268 } 269 270 void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif, 271 u8 hlid, bool clean_queues) 272 { 273 struct ieee80211_sta *sta; 274 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); 275 276 if (test_bit(hlid, &wl->ap_ps_map)) 277 return; 278 279 wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d " 280 "clean_queues %d", hlid, wl->links[hlid].allocated_pkts, 281 clean_queues); 282 283 rcu_read_lock(); 284 sta = ieee80211_find_sta(vif, wl->links[hlid].addr); 285 if (!sta) { 286 wl1271_error("could not find sta %pM for starting ps", 287 wl->links[hlid].addr); 288 rcu_read_unlock(); 289 return; 290 } 291 292 ieee80211_sta_ps_transition_ni(sta, true); 293 rcu_read_unlock(); 294 295 /* do we want to filter all frames from this link's queues? */ 296 if (clean_queues) 297 wl1271_ps_filter_frames(wl, hlid); 298 299 __set_bit(hlid, &wl->ap_ps_map); 300 } 301 302 void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid) 303 { 304 struct ieee80211_sta *sta; 305 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); 306 307 if (!test_bit(hlid, &wl->ap_ps_map)) 308 return; 309 310 wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid); 311 312 __clear_bit(hlid, &wl->ap_ps_map); 313 314 rcu_read_lock(); 315 sta = ieee80211_find_sta(vif, wl->links[hlid].addr); 316 if (!sta) { 317 wl1271_error("could not find sta %pM for ending ps", 318 wl->links[hlid].addr); 319 goto end; 320 } 321 322 ieee80211_sta_ps_transition_ni(sta, false); 323 end: 324 rcu_read_unlock(); 325 } 326