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