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authorJonathan Herman <hermanjl@cs.unc.edu>2013-01-22 10:38:37 -0500
committerJonathan Herman <hermanjl@cs.unc.edu>2013-01-22 10:38:37 -0500
commitfcc9d2e5a6c89d22b8b773a64fb4ad21ac318446 (patch)
treea57612d1888735a2ec7972891b68c1ac5ec8faea /drivers/net/wireless/wl12xx/ps.c
parent8dea78da5cee153b8af9c07a2745f6c55057fe12 (diff)
Added missing tegra files.HEADmaster
Diffstat (limited to 'drivers/net/wireless/wl12xx/ps.c')
-rw-r--r--drivers/net/wireless/wl12xx/ps.c274
1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/net/wireless/wl12xx/ps.c b/drivers/net/wireless/wl12xx/ps.c
new file mode 100644
index 00000000000..3548377ab9c
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/ps.c
@@ -0,0 +1,274 @@
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}