summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/ti/wlcore/ps.c
blob: 9654577efd012e0faaa7e785fe3a4f15cc1ae5ba (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
/*
 * 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 = 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 != 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 (wlvif->bss_type == BSS_TYPE_AP_BSS)
			goto out;

		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;

	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 (wlvif->bss_type == BSS_TYPE_AP_BSS)
			return;

		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));
}

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);

	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;
}

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 (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();
}