275 lines
6.6 KiB
C
275 lines
6.6 KiB
C
/*
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* This file is part of wl1271
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*
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* Copyright (C) 2008-2009 Nokia Corporation
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*
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* Contact: Luciano Coelho <luciano.coelho@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include "reg.h"
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#include "ps.h"
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#include "io.h"
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#include "tx.h"
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#define WL1271_WAKEUP_TIMEOUT 500
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void wl1271_elp_work(struct work_struct *work)
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{
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struct delayed_work *dwork;
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struct wl1271 *wl;
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dwork = container_of(work, struct delayed_work, work);
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wl = container_of(dwork, struct wl1271, elp_work);
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wl1271_debug(DEBUG_PSM, "elp work");
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mutex_lock(&wl->mutex);
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if (unlikely(wl->state == WL1271_STATE_OFF))
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goto out;
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/* our work might have been already cancelled */
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if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
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goto out;
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if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags) ||
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(!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
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!test_bit(WL1271_FLAG_IDLE, &wl->flags)))
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goto out;
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wl1271_debug(DEBUG_PSM, "chip to elp");
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wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
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set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
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out:
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mutex_unlock(&wl->mutex);
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}
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#define ELP_ENTRY_DELAY 5
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/* Routines to toggle sleep mode while in ELP */
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void wl1271_ps_elp_sleep(struct wl1271 *wl)
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{
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/* we shouldn't get consecutive sleep requests */
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if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
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return;
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if (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
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!test_bit(WL1271_FLAG_IDLE, &wl->flags))
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return;
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ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
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msecs_to_jiffies(ELP_ENTRY_DELAY));
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}
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int wl1271_ps_elp_wakeup(struct wl1271 *wl)
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{
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DECLARE_COMPLETION_ONSTACK(compl);
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unsigned long flags;
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int ret;
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u32 start_time = jiffies;
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bool pending = false;
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/*
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* we might try to wake up even if we didn't go to sleep
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* before (e.g. on boot)
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*/
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if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))
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return 0;
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/* don't cancel_sync as it might contend for a mutex and deadlock */
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cancel_delayed_work(&wl->elp_work);
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if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
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return 0;
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wl1271_debug(DEBUG_PSM, "waking up chip from elp");
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/*
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* The spinlock is required here to synchronize both the work and
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* the completion variable in one entity.
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*/
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spin_lock_irqsave(&wl->wl_lock, flags);
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if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
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pending = true;
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else
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wl->elp_compl = &compl;
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spin_unlock_irqrestore(&wl->wl_lock, flags);
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wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
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if (!pending) {
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ret = wait_for_completion_timeout(
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&compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
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if (ret == 0) {
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wl1271_error("ELP wakeup timeout!");
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wl12xx_queue_recovery_work(wl);
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ret = -ETIMEDOUT;
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goto err;
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} else if (ret < 0) {
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wl1271_error("ELP wakeup completion error.");
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goto err;
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}
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}
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clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
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wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
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jiffies_to_msecs(jiffies - start_time));
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goto out;
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err:
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spin_lock_irqsave(&wl->wl_lock, flags);
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wl->elp_compl = NULL;
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spin_unlock_irqrestore(&wl->wl_lock, flags);
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return ret;
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out:
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return 0;
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}
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int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
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u32 rates, bool send)
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{
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int ret;
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switch (mode) {
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case STATION_POWER_SAVE_MODE:
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wl1271_debug(DEBUG_PSM, "entering psm");
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ret = wl1271_acx_wake_up_conditions(wl);
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if (ret < 0) {
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wl1271_error("couldn't set wake up conditions");
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return ret;
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}
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ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
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if (ret < 0)
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return ret;
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set_bit(WL1271_FLAG_PSM, &wl->flags);
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break;
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case STATION_ACTIVE_MODE:
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default:
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wl1271_debug(DEBUG_PSM, "leaving psm");
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/* disable beacon early termination */
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if (wl->band == IEEE80211_BAND_2GHZ) {
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ret = wl1271_acx_bet_enable(wl, false);
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if (ret < 0)
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return ret;
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}
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/* disable beacon filtering */
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ret = wl1271_acx_beacon_filter_opt(wl, false);
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if (ret < 0)
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return ret;
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ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
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if (ret < 0)
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return ret;
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clear_bit(WL1271_FLAG_PSM, &wl->flags);
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break;
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}
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return ret;
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}
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static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
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{
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int i;
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struct sk_buff *skb;
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struct ieee80211_tx_info *info;
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unsigned long flags;
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int filtered[NUM_TX_QUEUES];
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/* filter all frames currently the low level queus for this hlid */
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for (i = 0; i < NUM_TX_QUEUES; i++) {
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filtered[i] = 0;
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while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
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info = IEEE80211_SKB_CB(skb);
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info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
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info->status.rates[0].idx = -1;
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ieee80211_tx_status_ni(wl->hw, skb);
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filtered[i]++;
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}
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}
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spin_lock_irqsave(&wl->wl_lock, flags);
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for (i = 0; i < NUM_TX_QUEUES; i++)
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wl->tx_queue_count[i] -= filtered[i];
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spin_unlock_irqrestore(&wl->wl_lock, flags);
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wl1271_handle_tx_low_watermark(wl);
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}
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void wl1271_ps_link_start(struct wl1271 *wl, u8 hlid, bool clean_queues)
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{
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struct ieee80211_sta *sta;
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if (test_bit(hlid, &wl->ap_ps_map))
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return;
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wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d blks %d "
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"clean_queues %d", hlid, wl->links[hlid].allocated_blks,
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clean_queues);
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rcu_read_lock();
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sta = ieee80211_find_sta(wl->vif, wl->links[hlid].addr);
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if (!sta) {
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wl1271_error("could not find sta %pM for starting ps",
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wl->links[hlid].addr);
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rcu_read_unlock();
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return;
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}
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ieee80211_sta_ps_transition_ni(sta, true);
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rcu_read_unlock();
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/* do we want to filter all frames from this link's queues? */
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if (clean_queues)
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wl1271_ps_filter_frames(wl, hlid);
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__set_bit(hlid, &wl->ap_ps_map);
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}
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void wl1271_ps_link_end(struct wl1271 *wl, u8 hlid)
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{
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struct ieee80211_sta *sta;
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if (!test_bit(hlid, &wl->ap_ps_map))
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return;
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wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
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__clear_bit(hlid, &wl->ap_ps_map);
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rcu_read_lock();
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sta = ieee80211_find_sta(wl->vif, wl->links[hlid].addr);
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if (!sta) {
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wl1271_error("could not find sta %pM for ending ps",
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wl->links[hlid].addr);
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goto end;
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}
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ieee80211_sta_ps_transition_ni(sta, false);
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end:
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rcu_read_unlock();
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}
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