1 /*
2 * This file is part of wl1251
3 *
4 * Copyright (C) 2008 Nokia Corporation
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
18 * 02110-1301 USA
19 *
20 */
21
22 #include "reg.h"
23 #include "ps.h"
24 #include "cmd.h"
25 #include "io.h"
26
27 /* in ms */
28 #define WL1251_WAKEUP_TIMEOUT 100
29
wl1251_elp_work(struct work_struct * work)30 void wl1251_elp_work(struct work_struct *work)
31 {
32 struct delayed_work *dwork;
33 struct wl1251 *wl;
34
35 dwork = container_of(work, struct delayed_work, work);
36 wl = container_of(dwork, struct wl1251, elp_work);
37
38 wl1251_debug(DEBUG_PSM, "elp work");
39
40 mutex_lock(&wl->mutex);
41
42 if (wl->elp || wl->station_mode == STATION_ACTIVE_MODE)
43 goto out;
44
45 wl1251_debug(DEBUG_PSM, "chip to elp");
46 wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
47 wl->elp = true;
48
49 out:
50 mutex_unlock(&wl->mutex);
51 }
52
53 #define ELP_ENTRY_DELAY 5
54
55 /* Routines to toggle sleep mode while in ELP */
wl1251_ps_elp_sleep(struct wl1251 * wl)56 void wl1251_ps_elp_sleep(struct wl1251 *wl)
57 {
58 unsigned long delay;
59
60 if (wl->station_mode != STATION_ACTIVE_MODE) {
61 delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
62 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
63 }
64 }
65
wl1251_ps_elp_wakeup(struct wl1251 * wl)66 int wl1251_ps_elp_wakeup(struct wl1251 *wl)
67 {
68 unsigned long timeout, start;
69 u32 elp_reg;
70
71 if (delayed_work_pending(&wl->elp_work))
72 cancel_delayed_work(&wl->elp_work);
73
74 if (!wl->elp)
75 return 0;
76
77 wl1251_debug(DEBUG_PSM, "waking up chip from elp");
78
79 start = jiffies;
80 timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
81
82 wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
83
84 elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
85
86 /*
87 * FIXME: we should wait for irq from chip but, as a temporary
88 * solution to simplify locking, let's poll instead
89 */
90 while (!(elp_reg & ELPCTRL_WLAN_READY)) {
91 if (time_after(jiffies, timeout)) {
92 wl1251_error("elp wakeup timeout");
93 return -ETIMEDOUT;
94 }
95 msleep(1);
96 elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
97 }
98
99 wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
100 jiffies_to_msecs(jiffies - start));
101
102 wl->elp = false;
103
104 return 0;
105 }
106
wl1251_ps_set_mode(struct wl1251 * wl,enum wl1251_station_mode mode)107 int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_station_mode mode)
108 {
109 int ret;
110
111 switch (mode) {
112 case STATION_POWER_SAVE_MODE:
113 wl1251_debug(DEBUG_PSM, "entering psm");
114
115 /* enable beacon filtering */
116 ret = wl1251_acx_beacon_filter_opt(wl, true);
117 if (ret < 0)
118 return ret;
119
120 ret = wl1251_acx_wake_up_conditions(wl,
121 WAKE_UP_EVENT_DTIM_BITMAP,
122 wl->listen_int);
123 if (ret < 0)
124 return ret;
125
126 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE,
127 WL1251_DEFAULT_BET_CONSECUTIVE);
128 if (ret < 0)
129 return ret;
130
131 ret = wl1251_cmd_ps_mode(wl, CHIP_POWER_SAVE_MODE);
132 if (ret < 0)
133 return ret;
134
135 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
136 if (ret < 0)
137 return ret;
138 break;
139 case STATION_IDLE:
140 wl1251_debug(DEBUG_PSM, "entering idle");
141
142 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
143 if (ret < 0)
144 return ret;
145
146 ret = wl1251_cmd_template_set(wl, CMD_DISCONNECT, NULL, 0);
147 if (ret < 0)
148 return ret;
149 break;
150 case STATION_ACTIVE_MODE:
151 default:
152 wl1251_debug(DEBUG_PSM, "leaving psm");
153
154 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
155 if (ret < 0)
156 return ret;
157
158 /* disable BET */
159 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE,
160 WL1251_DEFAULT_BET_CONSECUTIVE);
161 if (ret < 0)
162 return ret;
163
164 /* disable beacon filtering */
165 ret = wl1251_acx_beacon_filter_opt(wl, false);
166 if (ret < 0)
167 return ret;
168
169 ret = wl1251_acx_wake_up_conditions(wl,
170 WAKE_UP_EVENT_DTIM_BITMAP,
171 wl->listen_int);
172 if (ret < 0)
173 return ret;
174
175 ret = wl1251_cmd_ps_mode(wl, CHIP_ACTIVE_MODE);
176 if (ret < 0)
177 return ret;
178
179 break;
180 }
181 wl->station_mode = mode;
182
183 return ret;
184 }
185
186