drivers/net/wireless/wl12xx/ps.c - maze/linux - Git at Google

 /*
  * 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 "reg.h"
 #include "ps.h"
 #include "io.h"
 #include "tx.h"

 #define WL1271_WAKEUP_TIMEOUT 500

 void wl1271_elp_work(struct work_struct *work)
 {
 	struct delayed_work *dwork;
 	struct wl1271 *wl;

 	dwork = container_of(work, struct 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 == WL1271_STATE_OFF))
 		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) ||
 	    (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
 	     !test_bit(WL1271_FLAG_IDLE, &wl->flags)))
 		goto out;

 	wl1271_debug(DEBUG_PSM, "chip to elp");
 	wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
 	set_bit(WL1271_FLAG_IN_ELP, &wl->flags);

 out:
 	mutex_unlock(&wl->mutex);
 }

 #define ELP_ENTRY_DELAY  5

 /* Routines to toggle sleep mode while in ELP */
 void wl1271_ps_elp_sleep(struct wl1271 *wl)
 {
 	/* we shouldn't get consecutive sleep requests */
 	if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
 		return;

 	if (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
 	    !test_bit(WL1271_FLAG_IDLE, &wl->flags))
 		return;

 	ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
 				     msecs_to_jiffies(ELP_ENTRY_DELAY));
 }

 int wl1271_ps_elp_wakeup(struct wl1271 *wl)
 {
 	DECLARE_COMPLETION_ONSTACK(compl);
 	unsigned long flags;
 	int ret;
 	u32 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);

 	wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);

 	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;
 		} else if (ret < 0) {
 			wl1271_error("ELP wakeup completion error.");
 			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;
 }

 int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
 		       u32 rates, bool send)
 {
 	int ret;

 	switch (mode) {
 	case STATION_POWER_SAVE_MODE:
 		wl1271_debug(DEBUG_PSM, "entering psm");

 		ret = wl1271_acx_wake_up_conditions(wl);
 		if (ret < 0) {
 			wl1271_error("couldn't set wake up conditions");
 			return ret;
 		}

 		ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
 		if (ret < 0)
 			return ret;

 		set_bit(WL1271_FLAG_PSM, &wl->flags);
 		break;
 	case STATION_ACTIVE_MODE:
 	default:
 		wl1271_debug(DEBUG_PSM, "leaving psm");

 		/* disable beacon early termination */
 		if (wl->band == IEEE80211_BAND_2GHZ) {
 			ret = wl1271_acx_bet_enable(wl, false);
 			if (ret < 0)
 				return ret;
 		}

 		/* disable beacon filtering */
 		ret = wl1271_acx_beacon_filter_opt(wl, false);
 		if (ret < 0)
 			return ret;

 		ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
 		if (ret < 0)
 			return ret;

 		clear_bit(WL1271_FLAG_PSM, &wl->flags);
 		break;
 	}

 	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];

 	/* filter all frames currently the low level queus for this hlid */
 	for (i = 0; i < NUM_TX_QUEUES; i++) {
 		filtered[i] = 0;
 		while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 			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);
 			filtered[i]++;
 		}
 	}

 	spin_lock_irqsave(&wl->wl_lock, flags);
 	for (i = 0; i < NUM_TX_QUEUES; i++)
 		wl->tx_queue_count[i] -= filtered[i];
 	spin_unlock_irqrestore(&wl->wl_lock, flags);

 	wl1271_handle_tx_low_watermark(wl);
 }

 void wl1271_ps_link_start(struct wl1271 *wl, u8 hlid, bool clean_queues)
 {
 	struct ieee80211_sta *sta;

 	if (test_bit(hlid, &wl->ap_ps_map))
 		return;

 	wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d blks %d "
 		     "clean_queues %d", hlid, wl->links[hlid].allocated_blks,
 		     clean_queues);

 	rcu_read_lock();
 	sta = ieee80211_find_sta(wl->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 wl1271_ps_link_end(struct wl1271 *wl, u8 hlid)
 {
 	struct ieee80211_sta *sta;

 	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(wl->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();
 }
	/*
	* 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 "reg.h"
	#include "ps.h"
	#include "io.h"
	#include "tx.h"

	#define WL1271_WAKEUP_TIMEOUT 500

	void wl1271_elp_work(struct work_struct *work)
	{
	struct delayed_work *dwork;
	struct wl1271 *wl;

	dwork = container_of(work, struct 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 == WL1271_STATE_OFF))
	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) \|\|
	(!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
	!test_bit(WL1271_FLAG_IDLE, &wl->flags)))
	goto out;

	wl1271_debug(DEBUG_PSM, "chip to elp");
	wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
	set_bit(WL1271_FLAG_IN_ELP, &wl->flags);

	out:
	mutex_unlock(&wl->mutex);
	}

	#define ELP_ENTRY_DELAY 5

	/* Routines to toggle sleep mode while in ELP */
	void wl1271_ps_elp_sleep(struct wl1271 *wl)
	{
	/* we shouldn't get consecutive sleep requests */
	if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
	return;

	if (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
	!test_bit(WL1271_FLAG_IDLE, &wl->flags))
	return;

	ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
	msecs_to_jiffies(ELP_ENTRY_DELAY));
	}

	int wl1271_ps_elp_wakeup(struct wl1271 *wl)
	{
	DECLARE_COMPLETION_ONSTACK(compl);
	unsigned long flags;
	int ret;
	u32 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);

	wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);

	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;
	} else if (ret < 0) {
	wl1271_error("ELP wakeup completion error.");
	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;
	}

	int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
	u32 rates, bool send)
	{
	int ret;

	switch (mode) {
	case STATION_POWER_SAVE_MODE:
	wl1271_debug(DEBUG_PSM, "entering psm");

	ret = wl1271_acx_wake_up_conditions(wl);
	if (ret < 0) {
	wl1271_error("couldn't set wake up conditions");
	return ret;
	}

	ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
	if (ret < 0)
	return ret;

	set_bit(WL1271_FLAG_PSM, &wl->flags);
	break;
	case STATION_ACTIVE_MODE:
	default:
	wl1271_debug(DEBUG_PSM, "leaving psm");

	/* disable beacon early termination */
	if (wl->band == IEEE80211_BAND_2GHZ) {
	ret = wl1271_acx_bet_enable(wl, false);
	if (ret < 0)
	return ret;
	}

	/* disable beacon filtering */
	ret = wl1271_acx_beacon_filter_opt(wl, false);
	if (ret < 0)
	return ret;

	ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
	if (ret < 0)
	return ret;

	clear_bit(WL1271_FLAG_PSM, &wl->flags);
	break;
	}

	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];

	/* filter all frames currently the low level queus for this hlid */
	for (i = 0; i < NUM_TX_QUEUES; i++) {
	filtered[i] = 0;
	while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
	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);
	filtered[i]++;
	}
	}

	spin_lock_irqsave(&wl->wl_lock, flags);
	for (i = 0; i < NUM_TX_QUEUES; i++)
	wl->tx_queue_count[i] -= filtered[i];
	spin_unlock_irqrestore(&wl->wl_lock, flags);

	wl1271_handle_tx_low_watermark(wl);
	}

	void wl1271_ps_link_start(struct wl1271 *wl, u8 hlid, bool clean_queues)
	{
	struct ieee80211_sta *sta;

	if (test_bit(hlid, &wl->ap_ps_map))
	return;

	wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d blks %d "
	"clean_queues %d", hlid, wl->links[hlid].allocated_blks,
	clean_queues);

	rcu_read_lock();
	sta = ieee80211_find_sta(wl->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 wl1271_ps_link_end(struct wl1271 *wl, u8 hlid)
	{
	struct ieee80211_sta *sta;

	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(wl->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();
	}