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/*
* 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!");
ieee80211_queue_work(wl->hw, &wl->recovery_work);
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 */
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, filtered = 0;
struct sk_buff *skb;
struct ieee80211_tx_info *info;
unsigned long flags;
/* filter all frames currently the low level queus for this hlid */
for (i = 0; i < NUM_TX_QUEUES; i++) {
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(wl->hw, skb);
filtered++;
}
}
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count -= filtered;
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();
}
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