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 } 155 } 156 157 clear_bit(WL1271_FLAG_IN_ELP, &wl->flags); 158 159 wl1271_debug(DEBUG_PSM, "wakeup time: %u ms", 160 jiffies_to_msecs(jiffies - start_time)); 161 goto out; 162 163 err: 164 spin_lock_irqsave(&wl->wl_lock, flags); 165 wl->elp_compl = NULL; 166 spin_unlock_irqrestore(&wl->wl_lock, flags); 167 return ret; 168 169 out: 170 return 0; 171 } 172 173 int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif, 174 enum wl1271_cmd_ps_mode mode) 175 { 176 int ret; 177 u16 timeout = wl->conf.conn.dynamic_ps_timeout; 178 179 switch (mode) { 180 case STATION_AUTO_PS_MODE: 181 case STATION_POWER_SAVE_MODE: 182 wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)", 183 mode, timeout); 184 185 ret = wl1271_acx_wake_up_conditions(wl, wlvif, 186 wl->conf.conn.wake_up_event, 187 wl->conf.conn.listen_interval); 188 if (ret < 0) { 189 wl1271_error("couldn't set wake up conditions"); 190 return ret; 191 } 192 193 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout); 194 if (ret < 0) 195 return ret; 196 197 set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags); 198 199 /* 200 * enable beacon early termination. 201 * Not relevant for 5GHz and for high rates. 202 */ 203 if ((wlvif->band == IEEE80211_BAND_2GHZ) && 204 (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) { 205 ret = wl1271_acx_bet_enable(wl, wlvif, true); 206 if (ret < 0) 207 return ret; 208 } 209 break; 210 case STATION_ACTIVE_MODE: 211 wl1271_debug(DEBUG_PSM, "leaving psm"); 212 213 /* disable beacon early termination */ 214 if ((wlvif->band == IEEE80211_BAND_2GHZ) && 215 (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) { 216 ret = wl1271_acx_bet_enable(wl, wlvif, false); 217 if (ret < 0) 218 return ret; 219 } 220 221 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0); 222 if (ret < 0) 223 return ret; 224 225 clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags); 226 break; 227 default: 228 wl1271_warning("trying to set ps to unsupported mode %d", mode); 229 ret = -EINVAL; 230 } 231 232 return ret; 233 } 234 235 static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid) 236 { 237 int i; 238 struct sk_buff *skb; 239 struct ieee80211_tx_info *info; 240 unsigned long flags; 241 int filtered[NUM_TX_QUEUES]; 242 struct wl1271_link *lnk = &wl->links[hlid]; 243 244 /* filter all frames currently in the low level queues for this hlid */ 245 for (i = 0; i < NUM_TX_QUEUES; i++) { 246 filtered[i] = 0; 247 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) { 248 filtered[i]++; 249 250 if (WARN_ON(wl12xx_is_dummy_packet(wl, skb))) 251 continue; 252 253 info = IEEE80211_SKB_CB(skb); 254 info->flags |= IEEE80211_TX_STAT_TX_FILTERED; 255 info->status.rates[0].idx = -1; 256 ieee80211_tx_status_ni(wl->hw, skb); 257 } 258 } 259 260 spin_lock_irqsave(&wl->wl_lock, flags); 261 for (i = 0; i < NUM_TX_QUEUES; i++) { 262 wl->tx_queue_count[i] -= filtered[i]; 263 if (lnk->wlvif) 264 lnk->wlvif->tx_queue_count[i] -= filtered[i]; 265 } 266 spin_unlock_irqrestore(&wl->wl_lock, flags); 267 268 wl1271_handle_tx_low_watermark(wl); 269 } 270 271 void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif, 272 u8 hlid, bool clean_queues) 273 { 274 struct ieee80211_sta *sta; 275 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); 276 277 if (test_bit(hlid, &wl->ap_ps_map)) 278 return; 279 280 wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d " 281 "clean_queues %d", hlid, wl->links[hlid].allocated_pkts, 282 clean_queues); 283 284 rcu_read_lock(); 285 sta = ieee80211_find_sta(vif, wl->links[hlid].addr); 286 if (!sta) { 287 wl1271_error("could not find sta %pM for starting ps", 288 wl->links[hlid].addr); 289 rcu_read_unlock(); 290 return; 291 } 292 293 ieee80211_sta_ps_transition_ni(sta, true); 294 rcu_read_unlock(); 295 296 /* do we want to filter all frames from this link's queues? */ 297 if (clean_queues) 298 wl1271_ps_filter_frames(wl, hlid); 299 300 __set_bit(hlid, &wl->ap_ps_map); 301 } 302 303 void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid) 304 { 305 struct ieee80211_sta *sta; 306 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); 307 308 if (!test_bit(hlid, &wl->ap_ps_map)) 309 return; 310 311 wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid); 312 313 __clear_bit(hlid, &wl->ap_ps_map); 314 315 rcu_read_lock(); 316 sta = ieee80211_find_sta(vif, wl->links[hlid].addr); 317 if (!sta) { 318 wl1271_error("could not find sta %pM for ending ps", 319 wl->links[hlid].addr); 320 goto end; 321 } 322 323 ieee80211_sta_ps_transition_ni(sta, false); 324 end: 325 rcu_read_unlock(); 326 } 327