ps.c revision c3e334d29484423e78009790a3d3fa78da8b43a1 
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
30void 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->psm)
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
49out:
50	mutex_unlock(&wl->mutex);
51}
52
53#define ELP_ENTRY_DELAY  5
54
55/* Routines to toggle sleep mode while in ELP */
56void wl1251_ps_elp_sleep(struct wl1251 *wl)
57{
58	unsigned long delay;
59
60	if (wl->psm) {
61		cancel_delayed_work(&wl->elp_work);
62		delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
63		ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
64	}
65}
66
67int wl1251_ps_elp_wakeup(struct wl1251 *wl)
68{
69	unsigned long timeout, start;
70	u32 elp_reg;
71
72	if (!wl->elp)
73		return 0;
74
75	wl1251_debug(DEBUG_PSM, "waking up chip from elp");
76
77	start = jiffies;
78	timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
79
80	wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
81
82	elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
83
84	/*
85	 * FIXME: we should wait for irq from chip but, as a temporary
86	 * solution to simplify locking, let's poll instead
87	 */
88	while (!(elp_reg & ELPCTRL_WLAN_READY)) {
89		if (time_after(jiffies, timeout)) {
90			wl1251_error("elp wakeup timeout");
91			return -ETIMEDOUT;
92		}
93		msleep(1);
94		elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
95	}
96
97	wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
98		     jiffies_to_msecs(jiffies - start));
99
100	wl->elp = false;
101
102	return 0;
103}
104
105static int wl1251_ps_set_elp(struct wl1251 *wl, bool enable)
106{
107	int ret;
108
109	if (enable) {
110		wl1251_debug(DEBUG_PSM, "sleep auth psm/elp");
111
112		ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
113		if (ret < 0)
114			return ret;
115
116		wl1251_ps_elp_sleep(wl);
117	} else {
118		wl1251_debug(DEBUG_PSM, "sleep auth cam");
119
120		/*
121		 * When the target is in ELP, we can only
122		 * access the ELP control register. Thus,
123		 * we have to wake the target up before
124		 * changing the power authorization.
125		 */
126
127		wl1251_ps_elp_wakeup(wl);
128
129		ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
130		if (ret < 0)
131			return ret;
132	}
133
134	return 0;
135}
136
137int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_cmd_ps_mode mode)
138{
139	int ret;
140
141	switch (mode) {
142	case STATION_POWER_SAVE_MODE:
143		wl1251_debug(DEBUG_PSM, "entering psm");
144
145		/* enable beacon filtering */
146		ret = wl1251_acx_beacon_filter_opt(wl, true);
147		if (ret < 0)
148			return ret;
149
150		ret = wl1251_acx_wake_up_conditions(wl,
151						    WAKE_UP_EVENT_DTIM_BITMAP,
152						    wl->listen_int);
153		if (ret < 0)
154			return ret;
155
156		ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE,
157					    WL1251_DEFAULT_BET_CONSECUTIVE);
158		if (ret < 0)
159			return ret;
160
161		ret = wl1251_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
162		if (ret < 0)
163			return ret;
164
165		ret = wl1251_ps_set_elp(wl, true);
166		if (ret < 0)
167			return ret;
168
169		wl->psm = 1;
170		break;
171	case STATION_ACTIVE_MODE:
172	default:
173		wl1251_debug(DEBUG_PSM, "leaving psm");
174		ret = wl1251_ps_set_elp(wl, false);
175		if (ret < 0)
176			return ret;
177
178		/* disable BET */
179		ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE,
180					    WL1251_DEFAULT_BET_CONSECUTIVE);
181		if (ret < 0)
182			return ret;
183
184		/* disable beacon filtering */
185		ret = wl1251_acx_beacon_filter_opt(wl, false);
186		if (ret < 0)
187			return ret;
188
189		ret = wl1251_acx_wake_up_conditions(wl,
190						    WAKE_UP_EVENT_DTIM_BITMAP,
191						    wl->listen_int);
192		if (ret < 0)
193			return ret;
194
195		ret = wl1251_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
196		if (ret < 0)
197			return ret;
198
199		wl->psm = 0;
200		break;
201	}
202
203	return ret;
204}
205
206