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 "reg.h"
 25#include "ps.h"
 26#include "io.h"
 27#include "tx.h"
 28
 29#define WL1271_WAKEUP_TIMEOUT 500
 30
 31void wl1271_elp_work(struct work_struct *work)
 32{
 33	struct delayed_work *dwork;
 34	struct wl1271 *wl;
 35
 36	dwork = container_of(work, struct delayed_work, work);
 37	wl = container_of(dwork, struct wl1271, elp_work);
 38
 39	wl1271_debug(DEBUG_PSM, "elp work");
 40
 41	mutex_lock(&wl->mutex);
 42
 43	if (unlikely(wl->state == WL1271_STATE_OFF))
 44		goto out;
 45
 46	/* our work might have been already cancelled */
 47	if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
 48		goto out;
 49
 50	if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags) ||
 51	    (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
 52	     !test_bit(WL1271_FLAG_IDLE, &wl->flags)))
 53		goto out;
 54
 55	wl1271_debug(DEBUG_PSM, "chip to elp");
 56	wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
 57	set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 58
 59out:
 60	mutex_unlock(&wl->mutex);
 61}
 62
 63#define ELP_ENTRY_DELAY  5
 64
 65/* Routines to toggle sleep mode while in ELP */
 66void wl1271_ps_elp_sleep(struct wl1271 *wl)
 67{
 68	/* we shouldn't get consecutive sleep requests */
 69	if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
 70		return;
 71
 72	if (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
 73	    !test_bit(WL1271_FLAG_IDLE, &wl->flags))
 74		return;
 75
 76	ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
 77				     msecs_to_jiffies(ELP_ENTRY_DELAY));
 78}
 79
 80int wl1271_ps_elp_wakeup(struct wl1271 *wl)
 81{
 82	DECLARE_COMPLETION_ONSTACK(compl);
 83	unsigned long flags;
 84	int ret;
 85	u32 start_time = jiffies;
 86	bool pending = false;
 87
 88	/*
 89	 * we might try to wake up even if we didn't go to sleep
 90	 * before (e.g. on boot)
 91	 */
 92	if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))
 93		return 0;
 94
 95	/* don't cancel_sync as it might contend for a mutex and deadlock */
 96	cancel_delayed_work(&wl->elp_work);
 97
 98	if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
 99		return 0;
100
101	wl1271_debug(DEBUG_PSM, "waking up chip from elp");
102
103	/*
104	 * The spinlock is required here to synchronize both the work and
105	 * the completion variable in one entity.
106	 */
107	spin_lock_irqsave(&wl->wl_lock, flags);
108	if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
109		pending = true;
110	else
111		wl->elp_compl = &compl;
112	spin_unlock_irqrestore(&wl->wl_lock, flags);
113
114	wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
115
116	if (!pending) {
117		ret = wait_for_completion_timeout(
118			&compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
119		if (ret == 0) {
120			wl1271_error("ELP wakeup timeout!");
121			wl12xx_queue_recovery_work(wl);
122			ret = -ETIMEDOUT;
123			goto err;
124		} else if (ret < 0) {
125			wl1271_error("ELP wakeup completion error.");
126			goto err;
127		}
128	}
129
130	clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
131
132	wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
133		     jiffies_to_msecs(jiffies - start_time));
134	goto out;
135
136err:
137	spin_lock_irqsave(&wl->wl_lock, flags);
138	wl->elp_compl = NULL;
139	spin_unlock_irqrestore(&wl->wl_lock, flags);
140	return ret;
141
142out:
143	return 0;
144}
145
146int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
147		       u32 rates, bool send)
148{
149	int ret;
150
151	switch (mode) {
152	case STATION_POWER_SAVE_MODE:
153		wl1271_debug(DEBUG_PSM, "entering psm");
154
155		ret = wl1271_acx_wake_up_conditions(wl);
156		if (ret < 0) {
157			wl1271_error("couldn't set wake up conditions");
158			return ret;
159		}
160
161		ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
162		if (ret < 0)
163			return ret;
164
165		set_bit(WL1271_FLAG_PSM, &wl->flags);
166		break;
167	case STATION_ACTIVE_MODE:
168	default:
169		wl1271_debug(DEBUG_PSM, "leaving psm");
170
171		/* disable beacon early termination */
172		if (wl->band == IEEE80211_BAND_2GHZ) {
173			ret = wl1271_acx_bet_enable(wl, false);
174			if (ret < 0)
175				return ret;
176		}
177
178		/* disable beacon filtering */
179		ret = wl1271_acx_beacon_filter_opt(wl, false);
180		if (ret < 0)
181			return ret;
182
183		ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
184		if (ret < 0)
185			return ret;
186
187		clear_bit(WL1271_FLAG_PSM, &wl->flags);
188		break;
189	}
190
191	return ret;
192}
193
194static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
195{
196	int i;
197	struct sk_buff *skb;
198	struct ieee80211_tx_info *info;
199	unsigned long flags;
200	int filtered[NUM_TX_QUEUES];
201
202	/* filter all frames currently the low level queus for this hlid */
203	for (i = 0; i < NUM_TX_QUEUES; i++) {
204		filtered[i] = 0;
205		while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
206			info = IEEE80211_SKB_CB(skb);
207			info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
208			info->status.rates[0].idx = -1;
209			ieee80211_tx_status_ni(wl->hw, skb);
210			filtered[i]++;
211		}
212	}
213
214	spin_lock_irqsave(&wl->wl_lock, flags);
215	for (i = 0; i < NUM_TX_QUEUES; i++)
216		wl->tx_queue_count[i] -= filtered[i];
217	spin_unlock_irqrestore(&wl->wl_lock, flags);
218
219	wl1271_handle_tx_low_watermark(wl);
220}
221
222void wl1271_ps_link_start(struct wl1271 *wl, u8 hlid, bool clean_queues)
223{
224	struct ieee80211_sta *sta;
225
226	if (test_bit(hlid, &wl->ap_ps_map))
227		return;
228
229	wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d blks %d "
230		     "clean_queues %d", hlid, wl->links[hlid].allocated_blks,
231		     clean_queues);
232
233	rcu_read_lock();
234	sta = ieee80211_find_sta(wl->vif, wl->links[hlid].addr);
235	if (!sta) {
236		wl1271_error("could not find sta %pM for starting ps",
237			     wl->links[hlid].addr);
238		rcu_read_unlock();
239		return;
240	}
241
242	ieee80211_sta_ps_transition_ni(sta, true);
243	rcu_read_unlock();
244
245	/* do we want to filter all frames from this link's queues? */
246	if (clean_queues)
247		wl1271_ps_filter_frames(wl, hlid);
248
249	__set_bit(hlid, &wl->ap_ps_map);
250}
251
252void wl1271_ps_link_end(struct wl1271 *wl, u8 hlid)
253{
254	struct ieee80211_sta *sta;
255
256	if (!test_bit(hlid, &wl->ap_ps_map))
257		return;
258
259	wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
260
261	__clear_bit(hlid, &wl->ap_ps_map);
262
263	rcu_read_lock();
264	sta = ieee80211_find_sta(wl->vif, wl->links[hlid].addr);
265	if (!sta) {
266		wl1271_error("could not find sta %pM for ending ps",
267			     wl->links[hlid].addr);
268		goto end;
269	}
270
271	ieee80211_sta_ps_transition_ni(sta, false);
272end:
273	rcu_read_unlock();
274}