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
|
/*
* This file is part of wl1251
*
* Copyright (C) 2008 Nokia Corporation
*
* Contact: Kalle Valo <kalle.valo@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 "wl1251_reg.h"
#include "wl1251_ps.h"
#include "wl1251_cmd.h"
#include "wl1251_io.h"
/* in ms */
#define WL1251_WAKEUP_TIMEOUT 100
void wl1251_elp_work(struct work_struct *work)
{
struct delayed_work *dwork;
struct wl1251 *wl;
dwork = container_of(work, struct delayed_work, work);
wl = container_of(dwork, struct wl1251, elp_work);
wl1251_debug(DEBUG_PSM, "elp work");
mutex_lock(&wl->mutex);
if (wl->elp || !wl->psm)
goto out;
wl1251_debug(DEBUG_PSM, "chip to elp");
wl1251_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
wl->elp = true;
out:
mutex_unlock(&wl->mutex);
}
#define ELP_ENTRY_DELAY 5
/* Routines to toggle sleep mode while in ELP */
void wl1251_ps_elp_sleep(struct wl1251 *wl)
{
unsigned long delay;
if (wl->psm) {
cancel_delayed_work(&wl->elp_work);
delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
}
}
int wl1251_ps_elp_wakeup(struct wl1251 *wl)
{
unsigned long timeout, start;
u32 elp_reg;
if (!wl->elp)
return 0;
wl1251_debug(DEBUG_PSM, "waking up chip from elp");
start = jiffies;
timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
wl1251_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
elp_reg = wl1251_read32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
/*
* FIXME: we should wait for irq from chip but, as a temporary
* solution to simplify locking, let's poll instead
*/
while (!(elp_reg & ELPCTRL_WLAN_READY)) {
if (time_after(jiffies, timeout)) {
wl1251_error("elp wakeup timeout");
return -ETIMEDOUT;
}
msleep(1);
elp_reg = wl1251_read32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
}
wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
jiffies_to_msecs(jiffies - start));
wl->elp = false;
return 0;
}
static int wl1251_ps_set_elp(struct wl1251 *wl, bool enable)
{
int ret;
if (enable) {
wl1251_debug(DEBUG_PSM, "sleep auth psm/elp");
ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
if (ret < 0)
return ret;
wl1251_ps_elp_sleep(wl);
} else {
wl1251_debug(DEBUG_PSM, "sleep auth cam");
/*
* When the target is in ELP, we can only
* access the ELP control register. Thus,
* we have to wake the target up before
* changing the power authorization.
*/
wl1251_ps_elp_wakeup(wl);
ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
if (ret < 0)
return ret;
}
return 0;
}
int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_cmd_ps_mode mode)
{
int ret;
switch (mode) {
case STATION_POWER_SAVE_MODE:
wl1251_debug(DEBUG_PSM, "entering psm");
/* enable beacon filtering */
ret = wl1251_acx_beacon_filter_opt(wl, true);
if (ret < 0)
return ret;
ret = wl1251_acx_wake_up_conditions(wl,
WAKE_UP_EVENT_DTIM_BITMAP,
wl->listen_int);
if (ret < 0)
return ret;
ret = wl1251_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
if (ret < 0)
return ret;
ret = wl1251_ps_set_elp(wl, true);
if (ret < 0)
return ret;
wl->psm = 1;
break;
case STATION_ACTIVE_MODE:
default:
wl1251_debug(DEBUG_PSM, "leaving psm");
ret = wl1251_ps_set_elp(wl, false);
if (ret < 0)
return ret;
/* disable beacon filtering */
ret = wl1251_acx_beacon_filter_opt(wl, false);
if (ret < 0)
return ret;
ret = wl1251_acx_wake_up_conditions(wl,
WAKE_UP_EVENT_DTIM_BITMAP,
wl->listen_int);
if (ret < 0)
return ret;
ret = wl1251_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
if (ret < 0)
return ret;
wl->psm = 0;
break;
}
return ret;
}
|
