Merge branch 'pstore-efi' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[pandora-kernel.git] / drivers / net / wireless / wl12xx / ps.c
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
31 void 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
59 out:
60         mutex_unlock(&wl->mutex);
61 }
62
63 #define ELP_ENTRY_DELAY  5
64
65 /* Routines to toggle sleep mode while in ELP */
66 void 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
80 int 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
136 err:
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
142 out:
143         return 0;
144 }
145
146 int 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
194 static 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
222 void 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
252 void 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);
272 end:
273         rcu_read_unlock();
274 }