| /* |
| * This file is part of wl1271 |
| * |
| * Copyright (C) 2008-2009 Nokia Corporation |
| * |
| * Contact: Luciano Coelho <luciano.coelho@nokia.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| * 02110-1301 USA |
| * |
| */ |
| |
| #include "ps.h" |
| #include "io.h" |
| #include "tx.h" |
| #include "debug.h" |
| |
| #define WL1271_WAKEUP_TIMEOUT 500 |
| |
| #define ELP_ENTRY_DELAY 30 |
| #define ELP_ENTRY_DELAY_FORCE_PS 5 |
| |
| void wl1271_elp_work(struct work_struct *work) |
| { |
| struct delayed_work *dwork; |
| struct wl1271 *wl; |
| struct wl12xx_vif *wlvif; |
| int ret; |
| |
| dwork = to_delayed_work(work); |
| wl = container_of(dwork, struct wl1271, elp_work); |
| |
| wl1271_debug(DEBUG_PSM, "elp work"); |
| |
| mutex_lock(&wl->mutex); |
| |
| if (unlikely(wl->state != WLCORE_STATE_ON)) |
| goto out; |
| |
| /* our work might have been already cancelled */ |
| if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))) |
| goto out; |
| |
| if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags)) |
| goto out; |
| |
| wl12xx_for_each_wlvif(wl, wlvif) { |
| if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) && |
| test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags)) |
| goto out; |
| } |
| |
| wl1271_debug(DEBUG_PSM, "chip to elp"); |
| ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_SLEEP); |
| if (ret < 0) { |
| wl12xx_queue_recovery_work(wl); |
| goto out; |
| } |
| |
| set_bit(WL1271_FLAG_IN_ELP, &wl->flags); |
| |
| out: |
| mutex_unlock(&wl->mutex); |
| } |
| |
| /* Routines to toggle sleep mode while in ELP */ |
| void wl1271_ps_elp_sleep(struct wl1271 *wl) |
| { |
| struct wl12xx_vif *wlvif; |
| u32 timeout; |
| |
| /* We do not enter elp sleep in PLT mode */ |
| if (wl->plt) |
| return; |
| |
| if (wl->sleep_auth != WL1271_PSM_ELP) |
| return; |
| |
| /* we shouldn't get consecutive sleep requests */ |
| if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))) |
| return; |
| |
| wl12xx_for_each_wlvif(wl, wlvif) { |
| if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) && |
| test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags)) |
| return; |
| } |
| |
| timeout = wl->conf.conn.forced_ps ? |
| ELP_ENTRY_DELAY_FORCE_PS : ELP_ENTRY_DELAY; |
| ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, |
| msecs_to_jiffies(timeout)); |
| } |
| EXPORT_SYMBOL_GPL(wl1271_ps_elp_sleep); |
| |
| int wl1271_ps_elp_wakeup(struct wl1271 *wl) |
| { |
| DECLARE_COMPLETION_ONSTACK(compl); |
| unsigned long flags; |
| int ret; |
| unsigned long start_time = jiffies; |
| bool pending = false; |
| |
| /* |
| * we might try to wake up even if we didn't go to sleep |
| * before (e.g. on boot) |
| */ |
| if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)) |
| return 0; |
| |
| /* don't cancel_sync as it might contend for a mutex and deadlock */ |
| cancel_delayed_work(&wl->elp_work); |
| |
| if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags)) |
| return 0; |
| |
| wl1271_debug(DEBUG_PSM, "waking up chip from elp"); |
| |
| /* |
| * The spinlock is required here to synchronize both the work and |
| * the completion variable in one entity. |
| */ |
| spin_lock_irqsave(&wl->wl_lock, flags); |
| if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags)) |
| pending = true; |
| else |
| wl->elp_compl = &compl; |
| spin_unlock_irqrestore(&wl->wl_lock, flags); |
| |
| ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_WAKE_UP); |
| if (ret < 0) { |
| wl12xx_queue_recovery_work(wl); |
| goto err; |
| } |
| |
| if (!pending) { |
| ret = wait_for_completion_timeout( |
| &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT)); |
| if (ret == 0) { |
| wl1271_error("ELP wakeup timeout!"); |
| wl12xx_queue_recovery_work(wl); |
| ret = -ETIMEDOUT; |
| goto err; |
| } |
| } |
| |
| clear_bit(WL1271_FLAG_IN_ELP, &wl->flags); |
| |
| wl1271_debug(DEBUG_PSM, "wakeup time: %u ms", |
| jiffies_to_msecs(jiffies - start_time)); |
| goto out; |
| |
| err: |
| spin_lock_irqsave(&wl->wl_lock, flags); |
| wl->elp_compl = NULL; |
| spin_unlock_irqrestore(&wl->wl_lock, flags); |
| return ret; |
| |
| out: |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(wl1271_ps_elp_wakeup); |
| |
| int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif, |
| enum wl1271_cmd_ps_mode mode) |
| { |
| int ret; |
| u16 timeout = wl->conf.conn.dynamic_ps_timeout; |
| |
| switch (mode) { |
| case STATION_AUTO_PS_MODE: |
| case STATION_POWER_SAVE_MODE: |
| wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)", |
| mode, timeout); |
| |
| ret = wl1271_acx_wake_up_conditions(wl, wlvif, |
| wl->conf.conn.wake_up_event, |
| wl->conf.conn.listen_interval); |
| if (ret < 0) { |
| wl1271_error("couldn't set wake up conditions"); |
| return ret; |
| } |
| |
| ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout); |
| if (ret < 0) |
| return ret; |
| |
| set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags); |
| |
| /* |
| * enable beacon early termination. |
| * Not relevant for 5GHz and for high rates. |
| */ |
| if ((wlvif->band == IEEE80211_BAND_2GHZ) && |
| (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) { |
| ret = wl1271_acx_bet_enable(wl, wlvif, true); |
| if (ret < 0) |
| return ret; |
| } |
| break; |
| case STATION_ACTIVE_MODE: |
| wl1271_debug(DEBUG_PSM, "leaving psm"); |
| |
| /* disable beacon early termination */ |
| if ((wlvif->band == IEEE80211_BAND_2GHZ) && |
| (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) { |
| ret = wl1271_acx_bet_enable(wl, wlvif, false); |
| if (ret < 0) |
| return ret; |
| } |
| |
| ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0); |
| if (ret < 0) |
| return ret; |
| |
| clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags); |
| break; |
| default: |
| wl1271_warning("trying to set ps to unsupported mode %d", mode); |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid) |
| { |
| int i; |
| struct sk_buff *skb; |
| struct ieee80211_tx_info *info; |
| unsigned long flags; |
| int filtered[NUM_TX_QUEUES]; |
| struct wl1271_link *lnk = &wl->links[hlid]; |
| |
| /* filter all frames currently in the low level queues for this hlid */ |
| for (i = 0; i < NUM_TX_QUEUES; i++) { |
| filtered[i] = 0; |
| while ((skb = skb_dequeue(&lnk->tx_queue[i]))) { |
| filtered[i]++; |
| |
| if (WARN_ON(wl12xx_is_dummy_packet(wl, skb))) |
| continue; |
| |
| info = IEEE80211_SKB_CB(skb); |
| info->flags |= IEEE80211_TX_STAT_TX_FILTERED; |
| info->status.rates[0].idx = -1; |
| ieee80211_tx_status_ni(wl->hw, skb); |
| } |
| } |
| |
| spin_lock_irqsave(&wl->wl_lock, flags); |
| for (i = 0; i < NUM_TX_QUEUES; i++) { |
| wl->tx_queue_count[i] -= filtered[i]; |
| if (lnk->wlvif) |
| lnk->wlvif->tx_queue_count[i] -= filtered[i]; |
| } |
| spin_unlock_irqrestore(&wl->wl_lock, flags); |
| |
| wl1271_handle_tx_low_watermark(wl); |
| } |
| |
| void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif, |
| u8 hlid, bool clean_queues) |
| { |
| struct ieee80211_sta *sta; |
| struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); |
| |
| if (WARN_ON_ONCE(wlvif->bss_type != BSS_TYPE_AP_BSS)) |
| return; |
| |
| if (!test_bit(hlid, wlvif->ap.sta_hlid_map) || |
| test_bit(hlid, &wl->ap_ps_map)) |
| return; |
| |
| wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d " |
| "clean_queues %d", hlid, wl->links[hlid].allocated_pkts, |
| clean_queues); |
| |
| rcu_read_lock(); |
| sta = ieee80211_find_sta(vif, wl->links[hlid].addr); |
| if (!sta) { |
| wl1271_error("could not find sta %pM for starting ps", |
| wl->links[hlid].addr); |
| rcu_read_unlock(); |
| return; |
| } |
| |
| ieee80211_sta_ps_transition_ni(sta, true); |
| rcu_read_unlock(); |
| |
| /* do we want to filter all frames from this link's queues? */ |
| if (clean_queues) |
| wl1271_ps_filter_frames(wl, hlid); |
| |
| __set_bit(hlid, &wl->ap_ps_map); |
| } |
| |
| void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid) |
| { |
| struct ieee80211_sta *sta; |
| struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); |
| |
| if (!test_bit(hlid, &wl->ap_ps_map)) |
| return; |
| |
| wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid); |
| |
| __clear_bit(hlid, &wl->ap_ps_map); |
| |
| rcu_read_lock(); |
| sta = ieee80211_find_sta(vif, wl->links[hlid].addr); |
| if (!sta) { |
| wl1271_error("could not find sta %pM for ending ps", |
| wl->links[hlid].addr); |
| goto end; |
| } |
| |
| ieee80211_sta_ps_transition_ni(sta, false); |
| end: |
| rcu_read_unlock(); |
| } |