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	cancel_delayed_work(&wl->elp_work);
72
73	if (!wl->elp)
74		return 0;
75
76	wl1251_debug(DEBUG_PSM, "waking up chip from elp");
77
78	start = jiffies;
79	timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
80
81	wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
82
83	elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
84
85	/*
86	 * FIXME: we should wait for irq from chip but, as a temporary
87	 * solution to simplify locking, let's poll instead
88	 */
89	while (!(elp_reg & ELPCTRL_WLAN_READY)) {
90		if (time_after(jiffies, timeout)) {
91			wl1251_error("elp wakeup timeout");
92			return -ETIMEDOUT;
93		}
94		msleep(1);
95		elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
96	}
97
98	wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
99		     jiffies_to_msecs(jiffies - start));
100
101	wl->elp = false;
102
103	return 0;
104}
105
106int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_station_mode mode)
107{
108	int ret;
109
110	switch (mode) {
111	case STATION_POWER_SAVE_MODE:
112		wl1251_debug(DEBUG_PSM, "entering psm");
113
114		/* enable beacon filtering */
115		ret = wl1251_acx_beacon_filter_opt(wl, true);
116		if (ret < 0)
117			return ret;
118
119		ret = wl1251_acx_wake_up_conditions(wl,
120						    WAKE_UP_EVENT_DTIM_BITMAP,
121						    wl->listen_int);
122		if (ret < 0)
123			return ret;
124
125		ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE,
126					    WL1251_DEFAULT_BET_CONSECUTIVE);
127		if (ret < 0)
128			return ret;
129
130		ret = wl1251_cmd_ps_mode(wl, CHIP_POWER_SAVE_MODE);
131		if (ret < 0)
132			return ret;
133
134		ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
135		if (ret < 0)
136			return ret;
137		break;
138	case STATION_IDLE:
139		wl1251_debug(DEBUG_PSM, "entering idle");
140
141		ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
142		if (ret < 0)
143			return ret;
144
145		ret = wl1251_cmd_template_set(wl, CMD_DISCONNECT, NULL, 0);
146		if (ret < 0)
147			return ret;
148		break;
149	case STATION_ACTIVE_MODE:
150	default:
151		wl1251_debug(DEBUG_PSM, "leaving psm");
152
153		ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
154		if (ret < 0)
155			return ret;
156
157		/* disable BET */
158		ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE,
159					    WL1251_DEFAULT_BET_CONSECUTIVE);
160		if (ret < 0)
161			return ret;
162
163		/* disable beacon filtering */
164		ret = wl1251_acx_beacon_filter_opt(wl, false);
165		if (ret < 0)
166			return ret;
167
168		ret = wl1251_acx_wake_up_conditions(wl,
169						    WAKE_UP_EVENT_DTIM_BITMAP,
170						    wl->listen_int);
171		if (ret < 0)
172			return ret;
173
174		ret = wl1251_cmd_ps_mode(wl, CHIP_ACTIVE_MODE);
175		if (ret < 0)
176			return ret;
177
178		break;
179	}
180	wl->station_mode = mode;
181
182	return ret;
183}
184
185