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->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
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->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
66int 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
107int 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